claw-code/rust/crates/commands/src/lib.rs

use std::collections::BTreeMap;
use std::env;
use std::fs;
use std::path::{Path, PathBuf};

use plugins::{PluginError, PluginManager, PluginSummary};
use runtime::{compact_session, CompactionConfig, Session};

#[derive(Debug, Clone, PartialEq, Eq)]
pub struct CommandManifestEntry {
    pub name: String,
    pub source: CommandSource,
}

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum CommandSource {
    Builtin,
    InternalOnly,
    FeatureGated,
}

#[derive(Debug, Clone, Default, PartialEq, Eq)]
pub struct CommandRegistry {
    entries: Vec<CommandManifestEntry>,
}

impl CommandRegistry {
    #[must_use]
    pub fn new(entries: Vec<CommandManifestEntry>) -> Self {
        Self { entries }
    }

    #[must_use]
    pub fn entries(&self) -> &[CommandManifestEntry] {
        &self.entries
    }
}

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub struct SlashCommandSpec {
    pub name: &'static str,
    pub aliases: &'static [&'static str],
    pub summary: &'static str,
    pub argument_hint: Option<&'static str>,
    pub resume_supported: bool,
}

const SLASH_COMMAND_SPECS: &[SlashCommandSpec] = &[
    SlashCommandSpec {
        name: "help",
        aliases: &[],
        summary: "Show available slash commands",
        argument_hint: None,
        resume_supported: true,
    },
    SlashCommandSpec {
        name: "status",
        aliases: &[],
        summary: "Show current session status",
        argument_hint: None,
        resume_supported: true,
    },
    SlashCommandSpec {
        name: "compact",
        aliases: &[],
        summary: "Compact local session history",
        argument_hint: None,
        resume_supported: true,
    },
    SlashCommandSpec {
        name: "model",
        aliases: &[],
        summary: "Show or switch the active model",
        argument_hint: Some("[model]"),
        resume_supported: false,
    },
    SlashCommandSpec {
        name: "permissions",
        aliases: &[],
        summary: "Show or switch the active permission mode",
        argument_hint: Some("[read-only|workspace-write|danger-full-access]"),
        resume_supported: false,
    },
    SlashCommandSpec {
        name: "clear",
        aliases: &[],
        summary: "Start a fresh local session",
        argument_hint: Some("[--confirm]"),
        resume_supported: true,
    },
    SlashCommandSpec {
        name: "cost",
        aliases: &[],
        summary: "Show cumulative token usage for this session",
        argument_hint: None,
        resume_supported: true,
    },
    SlashCommandSpec {
        name: "resume",
        aliases: &[],
        summary: "Load a saved session into the REPL",
        argument_hint: Some("<session-path>"),
        resume_supported: false,
    },
    SlashCommandSpec {
        name: "config",
        aliases: &[],
        summary: "Inspect Claude config files or merged sections",
        argument_hint: Some("[env|hooks|model|plugins]"),
        resume_supported: true,
    },
    SlashCommandSpec {
        name: "memory",
        aliases: &[],
        summary: "Inspect loaded Claude instruction memory files",
        argument_hint: None,
        resume_supported: true,
    },
    SlashCommandSpec {
        name: "init",
        aliases: &[],
        summary: "Create a starter CLAUDE.md for this repo",
        argument_hint: None,
        resume_supported: true,
    },
    SlashCommandSpec {
        name: "diff",
        aliases: &[],
        summary: "Show git diff for current workspace changes",
        argument_hint: None,
        resume_supported: true,
    },
    SlashCommandSpec {
        name: "version",
        aliases: &[],
        summary: "Show CLI version and build information",
        argument_hint: None,
        resume_supported: true,
    },
    SlashCommandSpec {
        name: "bughunter",
        aliases: &[],
        summary: "Inspect the codebase for likely bugs",
        argument_hint: Some("[scope]"),
        resume_supported: false,
    },
    SlashCommandSpec {
        name: "commit",
        aliases: &[],
        summary: "Generate a commit message and create a git commit",
        argument_hint: None,
        resume_supported: false,
    },
    SlashCommandSpec {
        name: "pr",
        aliases: &[],
        summary: "Draft or create a pull request from the conversation",
        argument_hint: Some("[context]"),
        resume_supported: false,
    },
    SlashCommandSpec {
        name: "issue",
        aliases: &[],
        summary: "Draft or create a GitHub issue from the conversation",
        argument_hint: Some("[context]"),
        resume_supported: false,
    },
    SlashCommandSpec {
        name: "ultraplan",
        aliases: &[],
        summary: "Run a deep planning prompt with multi-step reasoning",
        argument_hint: Some("[task]"),
        resume_supported: false,
    },
    SlashCommandSpec {
        name: "teleport",
        aliases: &[],
        summary: "Jump to a file or symbol by searching the workspace",
        argument_hint: Some("<symbol-or-path>"),
        resume_supported: false,
    },
    SlashCommandSpec {
        name: "debug-tool-call",
        aliases: &[],
        summary: "Replay the last tool call with debug details",
        argument_hint: None,
        resume_supported: false,
    },
    SlashCommandSpec {
        name: "export",
        aliases: &[],
        summary: "Export the current conversation to a file",
        argument_hint: Some("[file]"),
        resume_supported: true,
    },
    SlashCommandSpec {
        name: "session",
        aliases: &[],
        summary: "List or switch managed local sessions",
        argument_hint: Some("[list|switch <session-id>]"),
        resume_supported: false,
    },
    SlashCommandSpec {
        name: "plugin",
        aliases: &["plugins", "marketplace"],
        summary: "Manage Claude Code plugins",
        argument_hint: Some(
            "[list|install <path>|enable <name>|disable <name>|uninstall <id>|update <id>]",
        ),
        resume_supported: false,
    },
    SlashCommandSpec {
        name: "agents",
        aliases: &[],
        summary: "Manage agent configurations",
        argument_hint: None,
        resume_supported: false,
    },
    SlashCommandSpec {
        name: "skills",
        aliases: &[],
        summary: "List available skills",
        argument_hint: None,
        resume_supported: false,
    },
];

#[derive(Debug, Clone, PartialEq, Eq)]
pub enum SlashCommand {
    Help,
    Status,
    Compact,
    Bughunter {
        scope: Option<String>,
    },
    Commit,
    Pr {
        context: Option<String>,
    },
    Issue {
        context: Option<String>,
    },
    Ultraplan {
        task: Option<String>,
    },
    Teleport {
        target: Option<String>,
    },
    DebugToolCall,
    Model {
        model: Option<String>,
    },
    Permissions {
        mode: Option<String>,
    },
    Clear {
        confirm: bool,
    },
    Cost,
    Resume {
        session_path: Option<String>,
    },
    Config {
        section: Option<String>,
    },
    Memory,
    Init,
    Diff,
    Version,
    Export {
        path: Option<String>,
    },
    Session {
        action: Option<String>,
        target: Option<String>,
    },
    Plugins {
        action: Option<String>,
        target: Option<String>,
    },
    Agents {
        args: Option<String>,
    },
    Skills {
        args: Option<String>,
    },
    Unknown(String),
}

impl SlashCommand {
    #[must_use]
    pub fn parse(input: &str) -> Option<Self> {
        let trimmed = input.trim();
        if !trimmed.starts_with('/') {
            return None;
        }

        let mut parts = trimmed.trim_start_matches('/').split_whitespace();
        let command = parts.next().unwrap_or_default();
        Some(match command {
            "help" => Self::Help,
            "status" => Self::Status,
            "compact" => Self::Compact,
            "bughunter" => Self::Bughunter {
                scope: remainder_after_command(trimmed, command),
            },
            "commit" => Self::Commit,
            "pr" => Self::Pr {
                context: remainder_after_command(trimmed, command),
            },
            "issue" => Self::Issue {
                context: remainder_after_command(trimmed, command),
            },
            "ultraplan" => Self::Ultraplan {
                task: remainder_after_command(trimmed, command),
            },
            "teleport" => Self::Teleport {
                target: remainder_after_command(trimmed, command),
            },
            "debug-tool-call" => Self::DebugToolCall,
            "model" => Self::Model {
                model: parts.next().map(ToOwned::to_owned),
            },
            "permissions" => Self::Permissions {
                mode: parts.next().map(ToOwned::to_owned),
            },
            "clear" => Self::Clear {
                confirm: parts.next() == Some("--confirm"),
            },
            "cost" => Self::Cost,
            "resume" => Self::Resume {
                session_path: parts.next().map(ToOwned::to_owned),
            },
            "config" => Self::Config {
                section: parts.next().map(ToOwned::to_owned),
            },
            "memory" => Self::Memory,
            "init" => Self::Init,
            "diff" => Self::Diff,
            "version" => Self::Version,
            "export" => Self::Export {
                path: parts.next().map(ToOwned::to_owned),
            },
            "session" => Self::Session {
                action: parts.next().map(ToOwned::to_owned),
                target: parts.next().map(ToOwned::to_owned),
            },
            "plugin" | "plugins" | "marketplace" => Self::Plugins {
                action: parts.next().map(ToOwned::to_owned),
                target: {
                    let remainder = parts.collect::<Vec<_>>().join(" ");
                    (!remainder.is_empty()).then_some(remainder)
                },
            },
            "agents" => Self::Agents {
                args: remainder_after_command(trimmed, command),
            },
            "skills" => Self::Skills {
                args: remainder_after_command(trimmed, command),
            },
            other => Self::Unknown(other.to_string()),
        })
    }
}

fn remainder_after_command(input: &str, command: &str) -> Option<String> {
    input
        .trim()
        .strip_prefix(&format!("/{command}"))
        .map(str::trim)
        .filter(|value| !value.is_empty())
        .map(ToOwned::to_owned)
}

#[must_use]
pub fn slash_command_specs() -> &'static [SlashCommandSpec] {
    SLASH_COMMAND_SPECS
}

#[must_use]
pub fn resume_supported_slash_commands() -> Vec<&'static SlashCommandSpec> {
    slash_command_specs()
        .iter()
        .filter(|spec| spec.resume_supported)
        .collect()
}

#[must_use]
pub fn render_slash_command_help() -> String {
    let mut lines = vec![
        "Slash commands".to_string(),
        "  [resume] means the command also works with --resume SESSION.json".to_string(),
    ];
    for spec in slash_command_specs() {
        let name = match spec.argument_hint {
            Some(argument_hint) => format!("/{} {}", spec.name, argument_hint),
            None => format!("/{}", spec.name),
        };
        let alias_suffix = if spec.aliases.is_empty() {
            String::new()
        } else {
            format!(
                " (aliases: {})",
                spec.aliases
                    .iter()
                    .map(|alias| format!("/{alias}"))
                    .collect::<Vec<_>>()
                    .join(", ")
            )
        };
        let resume = if spec.resume_supported {
            " [resume]"
        } else {
            ""
        };
        lines.push(format!(
            "  {name:<20} {}{alias_suffix}{resume}",
            spec.summary
        ));
    }
    lines.join("\n")
}

#[derive(Debug, Clone, PartialEq, Eq)]
pub struct SlashCommandResult {
    pub message: String,
    pub session: Session,
}

#[derive(Debug, Clone, PartialEq, Eq)]
pub struct PluginsCommandResult {
    pub message: String,
    pub reload_runtime: bool,
}

#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
enum DefinitionSource {
    ProjectCodex,
    ProjectClaude,
    UserCodexHome,
    UserCodex,
    UserClaude,
}

impl DefinitionSource {
    fn label(self) -> &'static str {
        match self {
            Self::ProjectCodex => "Project (.codex)",
            Self::ProjectClaude => "Project (.claude)",
            Self::UserCodexHome => "User ($CODEX_HOME)",
            Self::UserCodex => "User (~/.codex)",
            Self::UserClaude => "User (~/.claude)",
        }
    }
}

#[derive(Debug, Clone, PartialEq, Eq)]
struct AgentSummary {
    name: String,
    description: Option<String>,
    model: Option<String>,
    reasoning_effort: Option<String>,
    source: DefinitionSource,
    shadowed_by: Option<DefinitionSource>,
}

#[derive(Debug, Clone, PartialEq, Eq)]
struct SkillSummary {
    name: String,
    description: Option<String>,
    source: DefinitionSource,
    shadowed_by: Option<DefinitionSource>,
}

#[allow(clippy::too_many_lines)]
pub fn handle_plugins_slash_command(
    action: Option<&str>,
    target: Option<&str>,
    manager: &mut PluginManager,
) -> Result<PluginsCommandResult, PluginError> {
    match action {
        None | Some("list") => Ok(PluginsCommandResult {
            message: render_plugins_report(&manager.list_installed_plugins()?),
            reload_runtime: false,
        }),
        Some("install") => {
            let Some(target) = target else {
                return Ok(PluginsCommandResult {
                    message: "Usage: /plugins install <path>".to_string(),
                    reload_runtime: false,
                });
            };
            let install = manager.install(target)?;
            let plugin = manager
                .list_installed_plugins()?
                .into_iter()
                .find(|plugin| plugin.metadata.id == install.plugin_id);
            Ok(PluginsCommandResult {
                message: render_plugin_install_report(&install.plugin_id, plugin.as_ref()),
                reload_runtime: true,
            })
        }
        Some("enable") => {
            let Some(target) = target else {
                return Ok(PluginsCommandResult {
                    message: "Usage: /plugins enable <name>".to_string(),
                    reload_runtime: false,
                });
            };
            let plugin = resolve_plugin_target(manager, target)?;
            manager.enable(&plugin.metadata.id)?;
            Ok(PluginsCommandResult {
                message: format!(
                    "Plugins\n  Result           enabled {}\n  Name             {}\n  Version          {}\n  Status           enabled",
                    plugin.metadata.id, plugin.metadata.name, plugin.metadata.version
                ),
                reload_runtime: true,
            })
        }
        Some("disable") => {
            let Some(target) = target else {
                return Ok(PluginsCommandResult {
                    message: "Usage: /plugins disable <name>".to_string(),
                    reload_runtime: false,
                });
            };
            let plugin = resolve_plugin_target(manager, target)?;
            manager.disable(&plugin.metadata.id)?;
            Ok(PluginsCommandResult {
                message: format!(
                    "Plugins\n  Result           disabled {}\n  Name             {}\n  Version          {}\n  Status           disabled",
                    plugin.metadata.id, plugin.metadata.name, plugin.metadata.version
                ),
                reload_runtime: true,
            })
        }
        Some("uninstall") => {
            let Some(target) = target else {
                return Ok(PluginsCommandResult {
                    message: "Usage: /plugins uninstall <plugin-id>".to_string(),
                    reload_runtime: false,
                });
            };
            manager.uninstall(target)?;
            Ok(PluginsCommandResult {
                message: format!("Plugins\n  Result           uninstalled {target}"),
                reload_runtime: true,
            })
        }
        Some("update") => {
            let Some(target) = target else {
                return Ok(PluginsCommandResult {
                    message: "Usage: /plugins update <plugin-id>".to_string(),
                    reload_runtime: false,
                });
            };
            let update = manager.update(target)?;
            let plugin = manager
                .list_installed_plugins()?
                .into_iter()
                .find(|plugin| plugin.metadata.id == update.plugin_id);
            Ok(PluginsCommandResult {
                message: format!(
                    "Plugins\n  Result           updated {}\n  Name             {}\n  Old version      {}\n  New version      {}\n  Status           {}",
                    update.plugin_id,
                    plugin
                        .as_ref()
                        .map_or_else(|| update.plugin_id.clone(), |plugin| plugin.metadata.name.clone()),
                    update.old_version,
                    update.new_version,
                    plugin
                        .as_ref()
                        .map_or("unknown", |plugin| if plugin.enabled { "enabled" } else { "disabled" }),
                ),
                reload_runtime: true,
            })
        }
        Some(other) => Ok(PluginsCommandResult {
            message: format!(
                "Unknown /plugins action '{other}'. Use list, install, enable, disable, uninstall, or update."
            ),
            reload_runtime: false,
        }),
    }
}

pub fn handle_agents_slash_command(args: Option<&str>, cwd: &Path) -> std::io::Result<String> {
    if let Some(args) = args.filter(|value| !value.trim().is_empty()) {
        return Ok(format!("Usage: /agents\nUnexpected arguments: {args}"));
    }

    let roots = discover_definition_roots(cwd, "agents");
    let agents = load_agents_from_roots(&roots)?;
    Ok(render_agents_report(&agents))
}

pub fn handle_skills_slash_command(args: Option<&str>, cwd: &Path) -> std::io::Result<String> {
    if let Some(args) = args.filter(|value| !value.trim().is_empty()) {
        return Ok(format!("Usage: /skills\nUnexpected arguments: {args}"));
    }

    let roots = discover_definition_roots(cwd, "skills");
    let skills = load_skills_from_roots(&roots)?;
    Ok(render_skills_report(&skills))
}

#[must_use]
pub fn render_plugins_report(plugins: &[PluginSummary]) -> String {
    let mut lines = vec!["Plugins".to_string()];
    if plugins.is_empty() {
        lines.push("  No plugins installed.".to_string());
        return lines.join("\n");
    }
    for plugin in plugins {
        let enabled = if plugin.enabled {
            "enabled"
        } else {
            "disabled"
        };
        lines.push(format!(
            "  {name:<20} v{version:<10} {enabled}",
            name = plugin.metadata.name,
            version = plugin.metadata.version,
        ));
    }
    lines.join("\n")
}

fn render_plugin_install_report(plugin_id: &str, plugin: Option<&PluginSummary>) -> String {
    let name = plugin.map_or(plugin_id, |plugin| plugin.metadata.name.as_str());
    let version = plugin.map_or("unknown", |plugin| plugin.metadata.version.as_str());
    let enabled = plugin.is_some_and(|plugin| plugin.enabled);
    format!(
        "Plugins\n  Result           installed {plugin_id}\n  Name             {name}\n  Version          {version}\n  Status           {}",
        if enabled { "enabled" } else { "disabled" }
    )
}

fn resolve_plugin_target(
    manager: &PluginManager,
    target: &str,
) -> Result<PluginSummary, PluginError> {
    let mut matches = manager
        .list_installed_plugins()?
        .into_iter()
        .filter(|plugin| plugin.metadata.id == target || plugin.metadata.name == target)
        .collect::<Vec<_>>();
    match matches.len() {
        1 => Ok(matches.remove(0)),
        0 => Err(PluginError::NotFound(format!(
            "plugin `{target}` is not installed or discoverable"
        ))),
        _ => Err(PluginError::InvalidManifest(format!(
            "plugin name `{target}` is ambiguous; use the full plugin id"
        ))),
    }
}

fn discover_definition_roots(cwd: &Path, leaf: &str) -> Vec<(DefinitionSource, PathBuf)> {
    let mut roots = Vec::new();

    for ancestor in cwd.ancestors() {
        push_unique_root(
            &mut roots,
            DefinitionSource::ProjectCodex,
            ancestor.join(".codex").join(leaf),
        );
        push_unique_root(
            &mut roots,
            DefinitionSource::ProjectClaude,
            ancestor.join(".claude").join(leaf),
        );
    }

    if let Ok(codex_home) = env::var("CODEX_HOME") {
        push_unique_root(
            &mut roots,
            DefinitionSource::UserCodexHome,
            PathBuf::from(codex_home).join(leaf),
        );
    }

    if let Some(home) = env::var_os("HOME") {
        let home = PathBuf::from(home);
        push_unique_root(
            &mut roots,
            DefinitionSource::UserCodex,
            home.join(".codex").join(leaf),
        );
        push_unique_root(
            &mut roots,
            DefinitionSource::UserClaude,
            home.join(".claude").join(leaf),
        );
    }

    roots
}

fn push_unique_root(
    roots: &mut Vec<(DefinitionSource, PathBuf)>,
    source: DefinitionSource,
    path: PathBuf,
) {
    if path.is_dir() && !roots.iter().any(|(_, existing)| existing == &path) {
        roots.push((source, path));
    }
}

fn load_agents_from_roots(
    roots: &[(DefinitionSource, PathBuf)],
) -> std::io::Result<Vec<AgentSummary>> {
    let mut agents = Vec::new();
    let mut active_sources = BTreeMap::<String, DefinitionSource>::new();

    for (source, root) in roots {
        let mut root_agents = Vec::new();
        for entry in fs::read_dir(root)? {
            let entry = entry?;
            if entry.path().extension().is_none_or(|ext| ext != "toml") {
                continue;
            }
            let contents = fs::read_to_string(entry.path())?;
            let fallback_name = entry.path().file_stem().map_or_else(
                || entry.file_name().to_string_lossy().to_string(),
                |stem| stem.to_string_lossy().to_string(),
            );
            root_agents.push(AgentSummary {
                name: parse_toml_string(&contents, "name").unwrap_or(fallback_name),
                description: parse_toml_string(&contents, "description"),
                model: parse_toml_string(&contents, "model"),
                reasoning_effort: parse_toml_string(&contents, "model_reasoning_effort"),
                source: *source,
                shadowed_by: None,
            });
        }
        root_agents.sort_by(|left, right| left.name.cmp(&right.name));

        for mut agent in root_agents {
            let key = agent.name.to_ascii_lowercase();
            if let Some(existing) = active_sources.get(&key) {
                agent.shadowed_by = Some(*existing);
            } else {
                active_sources.insert(key, agent.source);
            }
            agents.push(agent);
        }
    }

    Ok(agents)
}

fn load_skills_from_roots(
    roots: &[(DefinitionSource, PathBuf)],
) -> std::io::Result<Vec<SkillSummary>> {
    let mut skills = Vec::new();
    let mut active_sources = BTreeMap::<String, DefinitionSource>::new();

    for (source, root) in roots {
        let mut root_skills = Vec::new();
        for entry in fs::read_dir(root)? {
            let entry = entry?;
            if !entry.path().is_dir() {
                continue;
            }
            let skill_path = entry.path().join("SKILL.md");
            if !skill_path.is_file() {
                continue;
            }
            let contents = fs::read_to_string(skill_path)?;
            let (name, description) = parse_skill_frontmatter(&contents);
            root_skills.push(SkillSummary {
                name: name.unwrap_or_else(|| entry.file_name().to_string_lossy().to_string()),
                description,
                source: *source,
                shadowed_by: None,
            });
        }
        root_skills.sort_by(|left, right| left.name.cmp(&right.name));

        for mut skill in root_skills {
            let key = skill.name.to_ascii_lowercase();
            if let Some(existing) = active_sources.get(&key) {
                skill.shadowed_by = Some(*existing);
            } else {
                active_sources.insert(key, skill.source);
            }
            skills.push(skill);
        }
    }

    Ok(skills)
}

fn parse_toml_string(contents: &str, key: &str) -> Option<String> {
    let prefix = format!("{key} =");
    for line in contents.lines() {
        let trimmed = line.trim();
        if trimmed.starts_with('#') {
            continue;
        }
        let Some(value) = trimmed.strip_prefix(&prefix) else {
            continue;
        };
        let value = value.trim();
        let Some(value) = value
            .strip_prefix('"')
            .and_then(|value| value.strip_suffix('"'))
        else {
            continue;
        };
        if !value.is_empty() {
            return Some(value.to_string());
        }
    }
    None
}

fn parse_skill_frontmatter(contents: &str) -> (Option<String>, Option<String>) {
    let mut lines = contents.lines();
    if lines.next().map(str::trim) != Some("---") {
        return (None, None);
    }

    let mut name = None;
    let mut description = None;
    for line in lines {
        let trimmed = line.trim();
        if trimmed == "---" {
            break;
        }
        if let Some(value) = trimmed.strip_prefix("name:") {
            let value = value.trim();
            if !value.is_empty() {
                name = Some(value.to_string());
            }
            continue;
        }
        if let Some(value) = trimmed.strip_prefix("description:") {
            let value = value.trim();
            if !value.is_empty() {
                description = Some(value.to_string());
            }
        }
    }

    (name, description)
}

fn render_agents_report(agents: &[AgentSummary]) -> String {
    if agents.is_empty() {
        return "No agents found.".to_string();
    }

    let total_active = agents
        .iter()
        .filter(|agent| agent.shadowed_by.is_none())
        .count();
    let mut lines = vec![
        "Agents".to_string(),
        format!("  {total_active} active agents"),
        String::new(),
    ];

    for source in [
        DefinitionSource::ProjectCodex,
        DefinitionSource::ProjectClaude,
        DefinitionSource::UserCodexHome,
        DefinitionSource::UserCodex,
        DefinitionSource::UserClaude,
    ] {
        let group = agents
            .iter()
            .filter(|agent| agent.source == source)
            .collect::<Vec<_>>();
        if group.is_empty() {
            continue;
        }

        lines.push(format!("{}:", source.label()));
        for agent in group {
            let detail = agent_detail(agent);
            match agent.shadowed_by {
                Some(winner) => lines.push(format!("  (shadowed by {}) {detail}", winner.label())),
                None => lines.push(format!("  {detail}")),
            }
        }
        lines.push(String::new());
    }

    lines.join("\n").trim_end().to_string()
}

fn agent_detail(agent: &AgentSummary) -> String {
    let mut parts = vec![agent.name.clone()];
    if let Some(description) = &agent.description {
        parts.push(description.clone());
    }
    if let Some(model) = &agent.model {
        parts.push(model.clone());
    }
    if let Some(reasoning) = &agent.reasoning_effort {
        parts.push(reasoning.clone());
    }
    parts.join(" · ")
}

fn render_skills_report(skills: &[SkillSummary]) -> String {
    if skills.is_empty() {
        return "No skills found.".to_string();
    }

    let total_active = skills
        .iter()
        .filter(|skill| skill.shadowed_by.is_none())
        .count();
    let mut lines = vec![
        "Skills".to_string(),
        format!("  {total_active} available skills"),
        String::new(),
    ];

    for source in [
        DefinitionSource::ProjectCodex,
        DefinitionSource::ProjectClaude,
        DefinitionSource::UserCodexHome,
        DefinitionSource::UserCodex,
        DefinitionSource::UserClaude,
    ] {
        let group = skills
            .iter()
            .filter(|skill| skill.source == source)
            .collect::<Vec<_>>();
        if group.is_empty() {
            continue;
        }

        lines.push(format!("{}:", source.label()));
        for skill in group {
            let detail = match &skill.description {
                Some(description) => format!("{} · {}", skill.name, description),
                None => skill.name.clone(),
            };
            match skill.shadowed_by {
                Some(winner) => lines.push(format!("  (shadowed by {}) {detail}", winner.label())),
                None => lines.push(format!("  {detail}")),
            }
        }
        lines.push(String::new());
    }

    lines.join("\n").trim_end().to_string()
}

#[must_use]
pub fn handle_slash_command(
    input: &str,
    session: &Session,
    compaction: CompactionConfig,
) -> Option<SlashCommandResult> {
    match SlashCommand::parse(input)? {
        SlashCommand::Compact => {
            let result = compact_session(session, compaction);
            let message = if result.removed_message_count == 0 {
                "Compaction skipped: session is below the compaction threshold.".to_string()
            } else {
                format!(
                    "Compacted {} messages into a resumable system summary.",
                    result.removed_message_count
                )
            };
            Some(SlashCommandResult {
                message,
                session: result.compacted_session,
            })
        }
        SlashCommand::Help => Some(SlashCommandResult {
            message: render_slash_command_help(),
            session: session.clone(),
        }),
        SlashCommand::Status
        | SlashCommand::Bughunter { .. }
        | SlashCommand::Commit
        | SlashCommand::Pr { .. }
        | SlashCommand::Issue { .. }
        | SlashCommand::Ultraplan { .. }
        | SlashCommand::Teleport { .. }
        | SlashCommand::DebugToolCall
        | SlashCommand::Model { .. }
        | SlashCommand::Permissions { .. }
        | SlashCommand::Clear { .. }
        | SlashCommand::Cost
        | SlashCommand::Resume { .. }
        | SlashCommand::Config { .. }
        | SlashCommand::Memory
        | SlashCommand::Init
        | SlashCommand::Diff
        | SlashCommand::Version
        | SlashCommand::Export { .. }
        | SlashCommand::Session { .. }
        | SlashCommand::Plugins { .. }
        | SlashCommand::Agents { .. }
        | SlashCommand::Skills { .. }
        | SlashCommand::Unknown(_) => None,
    }
}

#[cfg(test)]
mod tests {
    use super::{
        handle_plugins_slash_command, handle_slash_command, load_agents_from_roots,
        load_skills_from_roots, render_agents_report, render_plugins_report, render_skills_report,
        render_slash_command_help, resume_supported_slash_commands, slash_command_specs,
        DefinitionSource, SlashCommand,
    };
    use plugins::{PluginKind, PluginManager, PluginManagerConfig, PluginMetadata, PluginSummary};
    use runtime::{CompactionConfig, ContentBlock, ConversationMessage, MessageRole, Session};
    use std::fs;
    use std::path::{Path, PathBuf};
    use std::time::{SystemTime, UNIX_EPOCH};

    fn temp_dir(label: &str) -> PathBuf {
        let nanos = SystemTime::now()
            .duration_since(UNIX_EPOCH)
            .expect("time should be after epoch")
            .as_nanos();
        std::env::temp_dir().join(format!("commands-plugin-{label}-{nanos}"))
    }

    fn write_external_plugin(root: &Path, name: &str, version: &str) {
        fs::create_dir_all(root.join(".claude-plugin")).expect("manifest dir");
        fs::write(
            root.join(".claude-plugin").join("plugin.json"),
            format!(
                "{{\n  \"name\": \"{name}\",\n  \"version\": \"{version}\",\n  \"description\": \"commands plugin\"\n}}"
            ),
        )
        .expect("write manifest");
    }

    fn write_bundled_plugin(root: &Path, name: &str, version: &str, default_enabled: bool) {
        fs::create_dir_all(root.join(".claude-plugin")).expect("manifest dir");
        fs::write(
            root.join(".claude-plugin").join("plugin.json"),
            format!(
                "{{\n  \"name\": \"{name}\",\n  \"version\": \"{version}\",\n  \"description\": \"bundled commands plugin\",\n  \"defaultEnabled\": {}\n}}",
                if default_enabled { "true" } else { "false" }
            ),
        )
        .expect("write bundled manifest");
    }

    fn write_agent(root: &Path, name: &str, description: &str, model: &str, reasoning: &str) {
        fs::create_dir_all(root).expect("agent root");
        fs::write(
            root.join(format!("{name}.toml")),
            format!(
                "name = \"{name}\"\ndescription = \"{description}\"\nmodel = \"{model}\"\nmodel_reasoning_effort = \"{reasoning}\"\n"
            ),
        )
        .expect("write agent");
    }

    fn write_skill(root: &Path, name: &str, description: &str) {
        let skill_root = root.join(name);
        fs::create_dir_all(&skill_root).expect("skill root");
        fs::write(
            skill_root.join("SKILL.md"),
            format!("---\nname: {name}\ndescription: {description}\n---\n\n# {name}\n"),
        )
        .expect("write skill");
    }

    #[allow(clippy::too_many_lines)]
    #[test]
    fn parses_supported_slash_commands() {
        assert_eq!(SlashCommand::parse("/help"), Some(SlashCommand::Help));
        assert_eq!(SlashCommand::parse(" /status "), Some(SlashCommand::Status));
        assert_eq!(
            SlashCommand::parse("/bughunter runtime"),
            Some(SlashCommand::Bughunter {
                scope: Some("runtime".to_string())
            })
        );
        assert_eq!(SlashCommand::parse("/commit"), Some(SlashCommand::Commit));
        assert_eq!(
            SlashCommand::parse("/pr ready for review"),
            Some(SlashCommand::Pr {
                context: Some("ready for review".to_string())
            })
        );
        assert_eq!(
            SlashCommand::parse("/issue flaky test"),
            Some(SlashCommand::Issue {
                context: Some("flaky test".to_string())
            })
        );
        assert_eq!(
            SlashCommand::parse("/ultraplan ship both features"),
            Some(SlashCommand::Ultraplan {
                task: Some("ship both features".to_string())
            })
        );
        assert_eq!(
            SlashCommand::parse("/teleport conversation.rs"),
            Some(SlashCommand::Teleport {
                target: Some("conversation.rs".to_string())
            })
        );
        assert_eq!(
            SlashCommand::parse("/debug-tool-call"),
            Some(SlashCommand::DebugToolCall)
        );
        assert_eq!(
            SlashCommand::parse("/model claude-opus"),
            Some(SlashCommand::Model {
                model: Some("claude-opus".to_string()),
            })
        );
        assert_eq!(
            SlashCommand::parse("/model"),
            Some(SlashCommand::Model { model: None })
        );
        assert_eq!(
            SlashCommand::parse("/permissions read-only"),
            Some(SlashCommand::Permissions {
                mode: Some("read-only".to_string()),
            })
        );
        assert_eq!(
            SlashCommand::parse("/clear"),
            Some(SlashCommand::Clear { confirm: false })
        );
        assert_eq!(
            SlashCommand::parse("/clear --confirm"),
            Some(SlashCommand::Clear { confirm: true })
        );
        assert_eq!(SlashCommand::parse("/cost"), Some(SlashCommand::Cost));
        assert_eq!(
            SlashCommand::parse("/resume session.json"),
            Some(SlashCommand::Resume {
                session_path: Some("session.json".to_string()),
            })
        );
        assert_eq!(
            SlashCommand::parse("/config"),
            Some(SlashCommand::Config { section: None })
        );
        assert_eq!(
            SlashCommand::parse("/config env"),
            Some(SlashCommand::Config {
                section: Some("env".to_string())
            })
        );
        assert_eq!(SlashCommand::parse("/memory"), Some(SlashCommand::Memory));
        assert_eq!(SlashCommand::parse("/init"), Some(SlashCommand::Init));
        assert_eq!(SlashCommand::parse("/diff"), Some(SlashCommand::Diff));
        assert_eq!(SlashCommand::parse("/version"), Some(SlashCommand::Version));
        assert_eq!(
            SlashCommand::parse("/export notes.txt"),
            Some(SlashCommand::Export {
                path: Some("notes.txt".to_string())
            })
        );
        assert_eq!(
            SlashCommand::parse("/session switch abc123"),
            Some(SlashCommand::Session {
                action: Some("switch".to_string()),
                target: Some("abc123".to_string())
            })
        );
        assert_eq!(
            SlashCommand::parse("/plugins install demo"),
            Some(SlashCommand::Plugins {
                action: Some("install".to_string()),
                target: Some("demo".to_string())
            })
        );
        assert_eq!(
            SlashCommand::parse("/plugins list"),
            Some(SlashCommand::Plugins {
                action: Some("list".to_string()),
                target: None
            })
        );
        assert_eq!(
            SlashCommand::parse("/plugins enable demo"),
            Some(SlashCommand::Plugins {
                action: Some("enable".to_string()),
                target: Some("demo".to_string())
            })
        );
        assert_eq!(
            SlashCommand::parse("/plugins disable demo"),
            Some(SlashCommand::Plugins {
                action: Some("disable".to_string()),
                target: Some("demo".to_string())
            })
        );
    }

    #[test]
    fn renders_help_from_shared_specs() {
        let help = render_slash_command_help();
        assert!(help.contains("works with --resume SESSION.json"));
        assert!(help.contains("/help"));
        assert!(help.contains("/status"));
        assert!(help.contains("/compact"));
        assert!(help.contains("/bughunter [scope]"));
        assert!(help.contains("/commit"));
        assert!(help.contains("/pr [context]"));
        assert!(help.contains("/issue [context]"));
        assert!(help.contains("/ultraplan [task]"));
        assert!(help.contains("/teleport <symbol-or-path>"));
        assert!(help.contains("/debug-tool-call"));
        assert!(help.contains("/model [model]"));
        assert!(help.contains("/permissions [read-only|workspace-write|danger-full-access]"));
        assert!(help.contains("/clear [--confirm]"));
        assert!(help.contains("/cost"));
        assert!(help.contains("/resume <session-path>"));
        assert!(help.contains("/config [env|hooks|model|plugins]"));
        assert!(help.contains("/memory"));
        assert!(help.contains("/init"));
        assert!(help.contains("/diff"));
        assert!(help.contains("/version"));
        assert!(help.contains("/export [file]"));
        assert!(help.contains("/session [list|switch <session-id>]"));
        assert!(help.contains(
            "/plugin [list|install <path>|enable <name>|disable <name>|uninstall <id>|update <id>]"
        ));
        assert!(help.contains("aliases: /plugins, /marketplace"));
        assert!(help.contains("/agents"));
        assert!(help.contains("/skills"));
        assert_eq!(slash_command_specs().len(), 25);
        assert_eq!(resume_supported_slash_commands().len(), 11);
    }

    #[test]
    fn compacts_sessions_via_slash_command() {
        let session = Session {
            version: 1,
            messages: vec![
                ConversationMessage::user_text("a ".repeat(200)),
                ConversationMessage::assistant(vec![ContentBlock::Text {
                    text: "b ".repeat(200),
                }]),
                ConversationMessage::tool_result("1", "bash", "ok ".repeat(200), false),
                ConversationMessage::assistant(vec![ContentBlock::Text {
                    text: "recent".to_string(),
                }]),
            ],
        };

        let result = handle_slash_command(
            "/compact",
            &session,
            CompactionConfig {
                preserve_recent_messages: 2,
                max_estimated_tokens: 1,
            },
        )
        .expect("slash command should be handled");

        assert!(result.message.contains("Compacted 2 messages"));
        assert_eq!(result.session.messages[0].role, MessageRole::System);
    }

    #[test]
    fn help_command_is_non_mutating() {
        let session = Session::new();
        let result = handle_slash_command("/help", &session, CompactionConfig::default())
            .expect("help command should be handled");
        assert_eq!(result.session, session);
        assert!(result.message.contains("Slash commands"));
    }

    #[test]
    fn ignores_unknown_or_runtime_bound_slash_commands() {
        let session = Session::new();
        assert!(handle_slash_command("/unknown", &session, CompactionConfig::default()).is_none());
        assert!(handle_slash_command("/status", &session, CompactionConfig::default()).is_none());
        assert!(
            handle_slash_command("/bughunter", &session, CompactionConfig::default()).is_none()
        );
        assert!(handle_slash_command("/commit", &session, CompactionConfig::default()).is_none());
        assert!(handle_slash_command("/pr", &session, CompactionConfig::default()).is_none());
        assert!(handle_slash_command("/issue", &session, CompactionConfig::default()).is_none());
        assert!(
            handle_slash_command("/ultraplan", &session, CompactionConfig::default()).is_none()
        );
        assert!(
            handle_slash_command("/teleport foo", &session, CompactionConfig::default()).is_none()
        );
        assert!(
            handle_slash_command("/debug-tool-call", &session, CompactionConfig::default())
                .is_none()
        );
        assert!(
            handle_slash_command("/model claude", &session, CompactionConfig::default()).is_none()
        );
        assert!(handle_slash_command(
            "/permissions read-only",
            &session,
            CompactionConfig::default()
        )
        .is_none());
        assert!(handle_slash_command("/clear", &session, CompactionConfig::default()).is_none());
        assert!(
            handle_slash_command("/clear --confirm", &session, CompactionConfig::default())
                .is_none()
        );
        assert!(handle_slash_command("/cost", &session, CompactionConfig::default()).is_none());
        assert!(handle_slash_command(
            "/resume session.json",
            &session,
            CompactionConfig::default()
        )
        .is_none());
        assert!(handle_slash_command("/config", &session, CompactionConfig::default()).is_none());
        assert!(
            handle_slash_command("/config env", &session, CompactionConfig::default()).is_none()
        );
        assert!(handle_slash_command("/diff", &session, CompactionConfig::default()).is_none());
        assert!(handle_slash_command("/version", &session, CompactionConfig::default()).is_none());
        assert!(
            handle_slash_command("/export note.txt", &session, CompactionConfig::default())
                .is_none()
        );
        assert!(
            handle_slash_command("/session list", &session, CompactionConfig::default()).is_none()
        );
        assert!(
            handle_slash_command("/plugins list", &session, CompactionConfig::default()).is_none()
        );
    }

    #[test]
    fn renders_plugins_report_with_name_version_and_status() {
        let rendered = render_plugins_report(&[
            PluginSummary {
                metadata: PluginMetadata {
                    id: "demo@external".to_string(),
                    name: "demo".to_string(),
                    version: "1.2.3".to_string(),
                    description: "demo plugin".to_string(),
                    kind: PluginKind::External,
                    source: "demo".to_string(),
                    default_enabled: false,
                    root: None,
                },
                enabled: true,
            },
            PluginSummary {
                metadata: PluginMetadata {
                    id: "sample@external".to_string(),
                    name: "sample".to_string(),
                    version: "0.9.0".to_string(),
                    description: "sample plugin".to_string(),
                    kind: PluginKind::External,
                    source: "sample".to_string(),
                    default_enabled: false,
                    root: None,
                },
                enabled: false,
            },
        ]);

        assert!(rendered.contains("demo"));
        assert!(rendered.contains("v1.2.3"));
        assert!(rendered.contains("enabled"));
        assert!(rendered.contains("sample"));
        assert!(rendered.contains("v0.9.0"));
        assert!(rendered.contains("disabled"));
    }

    #[test]
    fn lists_agents_from_project_and_user_roots() {
        let workspace = temp_dir("agents-workspace");
        let project_agents = workspace.join(".codex").join("agents");
        let user_home = temp_dir("agents-home");
        let user_agents = user_home.join(".codex").join("agents");

        write_agent(
            &project_agents,
            "planner",
            "Project planner",
            "gpt-5.4",
            "medium",
        );
        write_agent(
            &user_agents,
            "planner",
            "User planner",
            "gpt-5.4-mini",
            "high",
        );
        write_agent(
            &user_agents,
            "verifier",
            "Verification agent",
            "gpt-5.4-mini",
            "high",
        );

        let roots = vec![
            (DefinitionSource::ProjectCodex, project_agents),
            (DefinitionSource::UserCodex, user_agents),
        ];
        let report =
            render_agents_report(&load_agents_from_roots(&roots).expect("agent roots should load"));

        assert!(report.contains("Agents"));
        assert!(report.contains("2 active agents"));
        assert!(report.contains("Project (.codex):"));
        assert!(report.contains("planner · Project planner · gpt-5.4 · medium"));
        assert!(report.contains("User (~/.codex):"));
        assert!(report.contains("(shadowed by Project (.codex)) planner · User planner"));
        assert!(report.contains("verifier · Verification agent · gpt-5.4-mini · high"));

        let _ = fs::remove_dir_all(workspace);
        let _ = fs::remove_dir_all(user_home);
    }

    #[test]
    fn lists_skills_from_project_and_user_roots() {
        let workspace = temp_dir("skills-workspace");
        let project_skills = workspace.join(".codex").join("skills");
        let user_home = temp_dir("skills-home");
        let user_skills = user_home.join(".codex").join("skills");

        write_skill(&project_skills, "plan", "Project planning guidance");
        write_skill(&user_skills, "plan", "User planning guidance");
        write_skill(&user_skills, "help", "Help guidance");

        let roots = vec![
            (DefinitionSource::ProjectCodex, project_skills),
            (DefinitionSource::UserCodex, user_skills),
        ];
        let report =
            render_skills_report(&load_skills_from_roots(&roots).expect("skill roots should load"));

        assert!(report.contains("Skills"));
        assert!(report.contains("2 available skills"));
        assert!(report.contains("Project (.codex):"));
        assert!(report.contains("plan · Project planning guidance"));
        assert!(report.contains("User (~/.codex):"));
        assert!(report.contains("(shadowed by Project (.codex)) plan · User planning guidance"));
        assert!(report.contains("help · Help guidance"));

        let _ = fs::remove_dir_all(workspace);
        let _ = fs::remove_dir_all(user_home);
    }

    #[test]
    fn installs_plugin_from_path_and_lists_it() {
        let config_home = temp_dir("home");
        let source_root = temp_dir("source");
        write_external_plugin(&source_root, "demo", "1.0.0");

        let mut manager = PluginManager::new(PluginManagerConfig::new(&config_home));
        let install = handle_plugins_slash_command(
            Some("install"),
            Some(source_root.to_str().expect("utf8 path")),
            &mut manager,
        )
        .expect("install command should succeed");
        assert!(install.reload_runtime);
        assert!(install.message.contains("installed demo@external"));
        assert!(install.message.contains("Name             demo"));
        assert!(install.message.contains("Version          1.0.0"));
        assert!(install.message.contains("Status           enabled"));

        let list = handle_plugins_slash_command(Some("list"), None, &mut manager)
            .expect("list command should succeed");
        assert!(!list.reload_runtime);
        assert!(list.message.contains("demo"));
        assert!(list.message.contains("v1.0.0"));
        assert!(list.message.contains("enabled"));

        let _ = fs::remove_dir_all(config_home);
        let _ = fs::remove_dir_all(source_root);
    }

    #[test]
    fn enables_and_disables_plugin_by_name() {
        let config_home = temp_dir("toggle-home");
        let source_root = temp_dir("toggle-source");
        write_external_plugin(&source_root, "demo", "1.0.0");

        let mut manager = PluginManager::new(PluginManagerConfig::new(&config_home));
        handle_plugins_slash_command(
            Some("install"),
            Some(source_root.to_str().expect("utf8 path")),
            &mut manager,
        )
        .expect("install command should succeed");

        let disable = handle_plugins_slash_command(Some("disable"), Some("demo"), &mut manager)
            .expect("disable command should succeed");
        assert!(disable.reload_runtime);
        assert!(disable.message.contains("disabled demo@external"));
        assert!(disable.message.contains("Name             demo"));
        assert!(disable.message.contains("Status           disabled"));

        let list = handle_plugins_slash_command(Some("list"), None, &mut manager)
            .expect("list command should succeed");
        assert!(list.message.contains("demo"));
        assert!(list.message.contains("disabled"));

        let enable = handle_plugins_slash_command(Some("enable"), Some("demo"), &mut manager)
            .expect("enable command should succeed");
        assert!(enable.reload_runtime);
        assert!(enable.message.contains("enabled demo@external"));
        assert!(enable.message.contains("Name             demo"));
        assert!(enable.message.contains("Status           enabled"));

        let list = handle_plugins_slash_command(Some("list"), None, &mut manager)
            .expect("list command should succeed");
        assert!(list.message.contains("demo"));
        assert!(list.message.contains("enabled"));

        let _ = fs::remove_dir_all(config_home);
        let _ = fs::remove_dir_all(source_root);
    }

    #[test]
    fn lists_auto_installed_bundled_plugins_with_status() {
        let config_home = temp_dir("bundled-home");
        let bundled_root = temp_dir("bundled-root");
        let bundled_plugin = bundled_root.join("starter");
        write_bundled_plugin(&bundled_plugin, "starter", "0.1.0", false);

        let mut config = PluginManagerConfig::new(&config_home);
        config.bundled_root = Some(bundled_root.clone());
        let mut manager = PluginManager::new(config);

        let list = handle_plugins_slash_command(Some("list"), None, &mut manager)
            .expect("list command should succeed");
        assert!(!list.reload_runtime);
        assert!(list.message.contains("starter"));
        assert!(list.message.contains("v0.1.0"));
        assert!(list.message.contains("disabled"));

        let _ = fs::remove_dir_all(config_home);
        let _ = fs::remove_dir_all(bundled_root);
    }
}