lean_ctx/hooks/

mod.rs

use std::path::PathBuf;

pub mod agents;
mod support;

/// Controls how hooks instruct agents to access lean-ctx functionality.
///
/// * `Mcp` — MCP server only (extension/plugin-based agents without reliable shell).
/// * `Hybrid` — MCP server + shell hooks for command compression (best of both).
#[derive(Clone, Copy, Debug, Default, PartialEq, Eq, serde::Serialize, serde::Deserialize)]
#[serde(rename_all = "snake_case")]
pub enum HookMode {
    #[default]
    Mcp,
    Hybrid,
}

impl std::fmt::Display for HookMode {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self {
            Self::Mcp => write!(f, "MCP"),
            Self::Hybrid => write!(f, "Hybrid"),
        }
    }
}

impl HookMode {
    pub fn from_str_loose(s: &str) -> Option<Self> {
        match s.to_lowercase().replace('-', "").as_str() {
            "mcp" => Some(Self::Mcp),
            "hybrid" => Some(Self::Hybrid),
            _ => None,
        }
    }

    pub fn description(&self) -> &'static str {
        match self {
            Self::Mcp => "MCP server only (extension/plugin-based agents without reliable shell)",
            Self::Hybrid => "MCP server + shell hooks for command compression (best of both)",
        }
    }
}

/// Auto-detect the best hook mode for a given agent key based on its shell capabilities.
///
/// Criteria (verified against provider docs May 2026):
///   Hybrid — MCP server (full Context OS) + shell hooks where available.
///            Read/Search via MCP (reliable, cached). Shell via hooks (zero overhead).
///   Mcp    — agent has no reliable direct shell tool (e.g. IDE plugin only)
pub fn recommend_hook_mode(agent_key: &str) -> HookMode {
    match agent_key {
        // Hybrid: MCP for reads/search + shell hooks for command compression.
        // Cursor: hooks.json with Shell matcher + MCP for ctx_read/ctx_search.
        // Gemini CLI: BeforeTool for shell + MCP for reads/search.
        // Codex: CLI variant has Bash hooks, Desktop/Cloud variants use MCP.
        // Claude Code: PreToolUse hooks for shell + MCP for reads/search.
        // All other agents with shell access: shell hooks + MCP.
        "cursor" | "gemini" | "codex" | "claude" | "claude-code" | "crush" | "hermes"
        | "opencode" | "pi" | "qoder" | "windsurf" | "amp" | "cline" | "roo" | "copilot"
        | "kiro" | "qwen" | "trae" | "antigravity" | "amazonq" | "verdent" => HookMode::Hybrid,

        // No reliable direct shell tool → MCP only
        _ => HookMode::Mcp,
    }
}
use agents::{
    install_amp_hook, install_antigravity_hook, install_claude_hook_config,
    install_claude_hook_scripts, install_claude_hook_with_mode, install_claude_project_hooks,
    install_cline_rules, install_codex_hook, install_copilot_hook, install_crush_hook_with_mode,
    install_cursor_hook_config, install_cursor_hook_scripts, install_cursor_hook_with_mode,
    install_gemini_hook, install_gemini_hook_config, install_gemini_hook_scripts,
    install_hermes_hook_with_mode, install_jetbrains_hook, install_kiro_hook,
    install_opencode_hook_with_mode, install_pi_hook_with_mode, install_qoder_hook_with_mode,
    install_windsurf_rules,
};
use support::{
    ensure_codex_hooks_enabled, install_codex_instruction_docs, install_named_json_server,
    upsert_lean_ctx_codex_hook_entries,
};

fn mcp_server_quiet_mode() -> bool {
    std::env::var_os("LEAN_CTX_MCP_SERVER").is_some()
        || matches!(std::env::var("LEAN_CTX_QUIET"), Ok(value) if value.trim() == "1")
}

/// Silently refresh all hook scripts for agents that are already configured.
/// Called after updates and on MCP server start to ensure hooks match the current binary version.
pub fn refresh_installed_hooks() {
    let Some(home) = crate::core::home::resolve_home_dir() else {
        return;
    };

    let claude_dir = crate::setup::claude_config_dir(&home);
    let claude_hooks = claude_dir.join("hooks/lean-ctx-rewrite.sh").exists()
        || claude_dir.join("settings.json").exists()
            && std::fs::read_to_string(claude_dir.join("settings.json"))
                .unwrap_or_default()
                .contains("lean-ctx");

    if claude_hooks {
        install_claude_hook_scripts(&home);
        install_claude_hook_config(&home);
    }

    let cursor_hooks = home.join(".cursor/hooks/lean-ctx-rewrite.sh").exists()
        || home.join(".cursor/hooks.json").exists()
            && std::fs::read_to_string(home.join(".cursor/hooks.json"))
                .unwrap_or_default()
                .contains("lean-ctx");

    if cursor_hooks {
        install_cursor_hook_scripts(&home);
        install_cursor_hook_config(&home);
    }

    let gemini_rewrite = home.join(".gemini/hooks/lean-ctx-rewrite-gemini.sh");
    let gemini_legacy = home.join(".gemini/hooks/lean-ctx-hook-gemini.sh");
    if gemini_rewrite.exists() || gemini_legacy.exists() {
        install_gemini_hook_scripts(&home);
        install_gemini_hook_config(&home);
    }

    let codex_dir = crate::core::home::resolve_codex_dir().unwrap_or_else(|| home.join(".codex"));
    let codex_hooks = codex_dir.join("hooks/lean-ctx-rewrite-codex.sh").exists()
        || codex_dir.join("hooks.json").exists()
            && std::fs::read_to_string(codex_dir.join("hooks.json"))
                .unwrap_or_default()
                .contains("lean-ctx");

    if codex_hooks {
        install_codex_hook();
    }
}

fn resolve_binary_path() -> String {
    if is_lean_ctx_in_path() {
        return "lean-ctx".to_string();
    }
    crate::core::portable_binary::resolve_portable_binary()
}

fn is_lean_ctx_in_path() -> bool {
    let which_cmd = if cfg!(windows) { "where" } else { "which" };
    std::process::Command::new(which_cmd)
        .arg("lean-ctx")
        .stdout(std::process::Stdio::null())
        .stderr(std::process::Stdio::null())
        .status()
        .is_ok_and(|s| s.success())
}

fn resolve_binary_path_for_bash() -> String {
    let path = resolve_binary_path();
    to_bash_compatible_path(&path)
}

pub fn to_bash_compatible_path(path: &str) -> String {
    let path = match crate::core::pathutil::strip_verbatim_str(path) {
        Some(stripped) => stripped,
        None => path.replace('\\', "/"),
    };
    if path.len() >= 2 && path.as_bytes()[1] == b':' {
        let drive = (path.as_bytes()[0] as char).to_ascii_lowercase();
        format!("/{drive}{}", &path[2..])
    } else {
        path
    }
}

/// Convert a Unix/MSYS-style path (`/c/Users/...`) back to native Windows
/// format (`C:/Users/...`). No-op for paths that don't match the pattern.
pub fn from_bash_to_native_path(path: &str) -> String {
    crate::core::pathutil::normalize_tool_path(path)
}

/// Normalize paths from any client format to a consistent OS-native form.
/// Delegates to `core::pathutil` so `core` crates do not depend on `hooks`.
pub fn normalize_tool_path(path: &str) -> String {
    crate::core::pathutil::normalize_tool_path(path)
}

pub fn generate_rewrite_script(binary: &str) -> String {
    let case_pattern = crate::rewrite_registry::bash_case_pattern();
    format!(
        r#"#!/usr/bin/env bash
# lean-ctx PreToolUse hook — rewrites bash commands to lean-ctx equivalents
set -euo pipefail

LEAN_CTX_BIN="{binary}"

INPUT=$(cat)
TOOL=$(echo "$INPUT" | grep -oE '"tool_name":"([^"\\]|\\.)*"' | head -1 | sed 's/^"tool_name":"//;s/"$//' | sed 's/\\"/"/g;s/\\\\/\\/g')

case "$TOOL" in
  Bash|bash|PowerShell|powershell) ;;
  *) exit 0 ;;
esac

CMD=$(echo "$INPUT" | grep -oE '"command":"([^"\\]|\\.)*"' | head -1 | sed 's/^"command":"//;s/"$//' | sed 's/\\"/"/g;s/\\\\/\\/g')

if [ -z "$CMD" ] || echo "$CMD" | grep -qE "^(lean-ctx |$LEAN_CTX_BIN )"; then
  exit 0
fi

case "$CMD" in
  {case_pattern})
    # Shell-escape then JSON-escape (two passes)
    SHELL_ESC=$(printf '%s' "$CMD" | sed 's/\\/\\\\/g;s/"/\\"/g')
    REWRITE="$LEAN_CTX_BIN -c \"$SHELL_ESC\""
    JSON_CMD=$(printf '%s' "$REWRITE" | sed 's/\\/\\\\/g;s/"/\\"/g')
    printf '{{"hookSpecificOutput":{{"hookEventName":"PreToolUse","permissionDecision":"allow","updatedInput":{{"command":"%s"}}}}}}' "$JSON_CMD"
    ;;
  *) exit 0 ;;
esac
"#
    )
}

pub fn generate_compact_rewrite_script(binary: &str) -> String {
    let case_pattern = crate::rewrite_registry::bash_case_pattern();
    format!(
        r#"#!/usr/bin/env bash
# lean-ctx hook — rewrites shell commands
set -euo pipefail
LEAN_CTX_BIN="{binary}"
INPUT=$(cat)
CMD=$(echo "$INPUT" | grep -oE '"command":"([^"\\]|\\.)*"' | head -1 | sed 's/^"command":"//;s/"$//' | sed 's/\\"/"/g;s/\\\\/\\/g' 2>/dev/null || echo "")
if [ -z "$CMD" ] || echo "$CMD" | grep -qE "^(lean-ctx |$LEAN_CTX_BIN )"; then exit 0; fi
case "$CMD" in
  {case_pattern})
    SHELL_ESC=$(printf '%s' "$CMD" | sed 's/\\/\\\\/g;s/"/\\"/g')
    REWRITE="$LEAN_CTX_BIN -c \"$SHELL_ESC\""
    JSON_CMD=$(printf '%s' "$REWRITE" | sed 's/\\/\\\\/g;s/"/\\"/g')
    printf '{{"hookSpecificOutput":{{"hookEventName":"PreToolUse","permissionDecision":"allow","updatedInput":{{"command":"%s"}}}}}}' "$JSON_CMD" ;;
  *) exit 0 ;;
esac
"#
    )
}

const REDIRECT_SCRIPT_CLAUDE: &str = r"#!/usr/bin/env bash
# lean-ctx PreToolUse hook — all native tools pass through
# Read/Grep/ListFiles are allowed so Edit (which requires native Read) works.
# The MCP instructions guide the AI to prefer ctx_read/ctx_search/ctx_tree.
exit 0
";

const REDIRECT_SCRIPT_GENERIC: &str = r"#!/usr/bin/env bash
# lean-ctx hook — all native tools pass through
exit 0
";

pub(crate) const HYBRID_RULES: &str = "\
# lean-ctx — Hybrid Mode (MCP reads + CLI commands)

Use MCP tools for reads (cache benefit), CLI commands for everything else (no schema overhead):

## MCP tools (keep using):
| Tool | Why MCP |
|------|---------|
| `ctx_read(path, mode)` | In-process cache, re-reads ~13 tokens |

## CLI commands (via Shell/Bash):
| USE (via Shell/Bash) | INSTEAD OF (MCP) | Why |
|---------------------|-------------------|-----|
| `lean-ctx -c \"<cmd>\"` | `ctx_shell` | No MCP schema overhead |
| `lean-ctx grep <pattern> [path]` | `ctx_search` | No MCP schema overhead |
| `lean-ctx ls [path]` | `ctx_tree` | No MCP schema overhead |

## File editing:
Use native Edit/StrReplace — lean-ctx only handles READ operations.
Write, Delete, Glob → use normally.
";

pub fn install_project_rules() {
    install_project_rules_for_agents(&[]);
}

/// Install project rules, optionally scoped to specific agents.
/// If `agents` is empty, installs for all agents (legacy behavior).
pub fn install_project_rules_for_agents(agents: &[&str]) {
    if crate::core::config::Config::load().rules_scope_effective()
        == crate::core::config::RulesScope::Global
    {
        return;
    }

    let cwd = std::env::current_dir().unwrap_or_default();

    if !is_inside_git_repo(&cwd) {
        eprintln!(
            "  Skipping project files: not inside a git repository.\n  \
             Run this command from your project root to create CLAUDE.md / AGENTS.md."
        );
        return;
    }

    let home = crate::core::home::resolve_home_dir().unwrap_or_default();
    if cwd == home {
        eprintln!(
            "  Skipping project files: current directory is your home folder.\n  \
             Run this command from a project directory instead."
        );
        return;
    }

    let all = agents.is_empty();
    let wants = |name: &str| all || agents.iter().any(|a| a.eq_ignore_ascii_case(name));

    ensure_project_agents_integration(&cwd);

    if wants("cursor") || wants("windsurf") {
        let cursorrules = cwd.join(".cursorrules");
        if !cursorrules.exists()
            || !std::fs::read_to_string(&cursorrules)
                .unwrap_or_default()
                .contains("lean-ctx")
        {
            let content = CURSORRULES_TEMPLATE;
            if cursorrules.exists() {
                let mut existing = std::fs::read_to_string(&cursorrules).unwrap_or_default();
                if !existing.ends_with('\n') {
                    existing.push('\n');
                }
                existing.push('\n');
                existing.push_str(content);
                write_file(&cursorrules, &existing);
            } else {
                write_file(&cursorrules, content);
            }
            if !mcp_server_quiet_mode() {
                eprintln!("Created/updated .cursorrules in project root.");
            }
        }
    }

    if wants("claude") {
        let claude_rules_dir = cwd.join(".claude").join("rules");
        let claude_rules_file = claude_rules_dir.join("lean-ctx.md");
        if !claude_rules_file.exists()
            || !std::fs::read_to_string(&claude_rules_file)
                .unwrap_or_default()
                .contains(crate::rules_inject::RULES_VERSION_STR)
        {
            let _ = std::fs::create_dir_all(&claude_rules_dir);
            write_file(
                &claude_rules_file,
                crate::rules_inject::rules_dedicated_markdown(),
            );
            if !mcp_server_quiet_mode() {
                eprintln!("Created .claude/rules/lean-ctx.md (Claude Code project rules).");
            }
        }

        install_claude_project_hooks(&cwd);
    }

    if wants("kiro") {
        let kiro_dir = cwd.join(".kiro");
        if kiro_dir.exists() {
            let steering_dir = kiro_dir.join("steering");
            let steering_file = steering_dir.join("lean-ctx.md");
            if !steering_file.exists()
                || !std::fs::read_to_string(&steering_file)
                    .unwrap_or_default()
                    .contains("lean-ctx")
            {
                let _ = std::fs::create_dir_all(&steering_dir);
                write_file(&steering_file, KIRO_STEERING_TEMPLATE);
                if !mcp_server_quiet_mode() {
                    eprintln!("Created .kiro/steering/lean-ctx.md (Kiro steering).");
                }
            }
        }
    }
}

const PROJECT_LEAN_CTX_MD_MARKER: &str = "<!-- lean-ctx-owned: PROJECT-LEAN-CTX.md v1 -->";
const PROJECT_LEAN_CTX_MD: &str = "LEAN-CTX.md";
const PROJECT_AGENTS_MD: &str = "AGENTS.md";
const AGENTS_BLOCK_START: &str = "<!-- lean-ctx -->";
const AGENTS_BLOCK_END: &str = "<!-- /lean-ctx -->";

fn ensure_project_agents_integration(cwd: &std::path::Path) {
    let lean_ctx_md = cwd.join(PROJECT_LEAN_CTX_MD);
    let desired = format!(
        "{PROJECT_LEAN_CTX_MD_MARKER}\n{}\n",
        crate::rules_inject::rules_dedicated_markdown()
    );

    if !lean_ctx_md.exists() {
        write_file(&lean_ctx_md, &desired);
    } else if std::fs::read_to_string(&lean_ctx_md)
        .unwrap_or_default()
        .contains(PROJECT_LEAN_CTX_MD_MARKER)
    {
        let current = std::fs::read_to_string(&lean_ctx_md).unwrap_or_default();
        if !current.contains(crate::rules_inject::RULES_VERSION_STR) {
            write_file(&lean_ctx_md, &desired);
        }
    }

    let block = format!(
        "{AGENTS_BLOCK_START}\n\
## lean-ctx\n\n\
Prefer lean-ctx MCP tools over native equivalents for token savings.\n\
Full rules: @{PROJECT_LEAN_CTX_MD}\n\
{AGENTS_BLOCK_END}\n"
    );

    let agents_md = cwd.join(PROJECT_AGENTS_MD);
    if !agents_md.exists() {
        let content = format!("# Agent Instructions\n\n{block}");
        write_file(&agents_md, &content);
        if !mcp_server_quiet_mode() {
            eprintln!("Created AGENTS.md in project root (lean-ctx reference only).");
        }
        return;
    }

    let existing = std::fs::read_to_string(&agents_md).unwrap_or_default();

    if existing.contains("CLI-first Token Optimization for Pi")
        && !existing.contains(AGENTS_BLOCK_START)
    {
        let content = format!("# Agent Instructions\n\n{block}");
        write_file(&agents_md, &content);
        return;
    }

    if existing.contains(AGENTS_BLOCK_START) {
        let updated = crate::marked_block::replace_marked_block(
            &existing,
            AGENTS_BLOCK_START,
            AGENTS_BLOCK_END,
            &block,
        );
        if updated != existing {
            write_file(&agents_md, &updated);
        }
        return;
    }

    if existing.contains("lean-ctx") && existing.contains(PROJECT_LEAN_CTX_MD) {
        return;
    }

    let mut out = existing;
    if !out.ends_with('\n') {
        out.push('\n');
    }
    out.push('\n');
    out.push_str(&block);
    write_file(&agents_md, &out);
    if !mcp_server_quiet_mode() {
        eprintln!("Updated AGENTS.md (added lean-ctx reference block).");
    }
}

const CURSORRULES_TEMPLATE: &str = "\
# lean-ctx — Context Engineering Layer

PREFER lean-ctx MCP tools over native equivalents for token savings:

| PREFER | OVER | Why |
|--------|------|-----|
| `ctx_read(path)` | `Read` | Cached, 10 compression modes |
| `ctx_shell(command)` | `Shell` | Pattern compression |
| `ctx_search(pattern, path)` | `Grep` | Compact results |
| `ctx_tree(path, depth)` | `ls` / `find` | Directory maps |
| `ctx_edit(path, old_string, new_string)` | `Edit` (when Read unavailable) | Search-and-replace without native Read |

Edit files: use native Edit/StrReplace if available. If Edit requires Read and Read is unavailable, use ctx_edit.
Write, Delete, Glob — use normally. NEVER loop on Edit failures — switch to ctx_edit immediately.
";

pub const KIRO_STEERING_TEMPLATE: &str = "\
---
inclusion: always
---

# lean-ctx — Context Engineering Layer

The workspace has the `lean-ctx` MCP server installed. You MUST prefer lean-ctx tools over native equivalents for token efficiency and caching.

## Mandatory Tool Preferences

| Use this | Instead of | Why |
|----------|-----------|-----|
| `mcp_lean_ctx_ctx_read` | `readFile`, `readCode` | Cached reads, 10 compression modes, re-reads cost ~13 tokens |
| `mcp_lean_ctx_ctx_multi_read` | `readMultipleFiles` | Batch cached reads in one call |
| `mcp_lean_ctx_ctx_shell` | `executeBash` | Pattern compression for git/npm/test output |
| `mcp_lean_ctx_ctx_search` | `grepSearch` | Compact, .gitignore-aware results |
| `mcp_lean_ctx_ctx_tree` | `listDirectory` | Compact directory maps with file counts |

## When to use native Kiro tools instead

- `fsWrite` / `fsAppend` — always use native (lean-ctx doesn't write files)
- `strReplace` — always use native (precise string replacement)
- `semanticRename` / `smartRelocate` — always use native (IDE integration)
- `getDiagnostics` — always use native (language server diagnostics)
- `deleteFile` — always use native

## Session management

- At the start of a long task, call `mcp_lean_ctx_ctx_preload` with a task description to warm the cache
- Use `mcp_lean_ctx_ctx_compress` periodically in long conversations to checkpoint context
- Use `mcp_lean_ctx_ctx_knowledge` to persist important discoveries across sessions

## Rules

- NEVER loop on edit failures — switch to `mcp_lean_ctx_ctx_edit` immediately
- For large files, use `mcp_lean_ctx_ctx_read` with `mode: \"signatures\"` or `mode: \"map\"` first
- For re-reading a file you already read, just call `mcp_lean_ctx_ctx_read` again (cache hit = ~13 tokens)
- When running tests or build commands, use `mcp_lean_ctx_ctx_shell` for compressed output
";

pub fn install_agent_hook(agent: &str, global: bool) {
    install_agent_hook_with_mode(agent, global, HookMode::Mcp);
}

pub fn install_agent_hook_with_mode(agent: &str, global: bool, mode: HookMode) {
    let home = crate::core::home::resolve_home_dir().unwrap_or_default();
    match agent {
        "claude" | "claude-code" => install_claude_hook_with_mode(global, mode),
        "cursor" => install_cursor_hook_with_mode(global, mode),
        "gemini" => install_gemini_hook(),
        "antigravity" => install_antigravity_hook(),
        "codex" => install_codex_hook(),
        "windsurf" => install_windsurf_rules(global),
        "cline" | "roo" => install_cline_rules(global),
        "copilot" | "vscode" => install_copilot_hook(global),
        "pi" => install_pi_hook_with_mode(global, mode),
        "qoder" => install_qoder_hook_with_mode(mode),
        "qoderwork" => install_mcp_json_agent(
            "QoderWork",
            "~/.qoderwork/mcp.json",
            &home.join(".qoderwork/mcp.json"),
        ),
        "qwen" => install_mcp_json_agent(
            "Qwen Code",
            "~/.qwen/settings.json",
            &home.join(".qwen/settings.json"),
        ),
        "trae" => install_mcp_json_agent("Trae", "~/.trae/mcp.json", &home.join(".trae/mcp.json")),
        "amazonq" => install_mcp_json_agent(
            "Amazon Q Developer",
            "~/.aws/amazonq/default.json",
            &home.join(".aws/amazonq/default.json"),
        ),
        "jetbrains" => install_jetbrains_hook(),
        "kiro" => install_kiro_hook(),
        "verdent" => install_mcp_json_agent(
            "Verdent",
            "~/.verdent/mcp.json",
            &home.join(".verdent/mcp.json"),
        ),
        "opencode" => install_opencode_hook_with_mode(mode),
        "amp" => install_amp_hook(),
        "crush" => install_crush_hook_with_mode(mode),
        "hermes" => install_hermes_hook_with_mode(global, mode),
        "zed" => {
            let zed_path = crate::core::editor_registry::zed_settings_path(&home);
            let binary = resolve_binary_path();
            let entry = full_server_entry(&binary);
            install_named_json_server("Zed", "settings.json", &zed_path, "context_servers", entry);
        }
        "aider" => {
            install_mcp_json_agent("Aider", "~/.aider/mcp.json", &home.join(".aider/mcp.json"));
        }
        "continue" => install_mcp_json_agent(
            "Continue",
            "~/.continue/mcp.json",
            &home.join(".continue/mcp.json"),
        ),
        "neovim" => install_mcp_json_agent(
            "Neovim (mcphub.nvim)",
            "~/.config/mcphub/servers.json",
            &home.join(".config/mcphub/servers.json"),
        ),
        "emacs" => install_mcp_json_agent(
            "Emacs (mcp.el)",
            "~/.emacs.d/mcp.json",
            &home.join(".emacs.d/mcp.json"),
        ),
        "sublime" => install_mcp_json_agent(
            "Sublime Text",
            "~/.config/sublime-text/mcp.json",
            &home.join(".config/sublime-text/mcp.json"),
        ),
        _ => {
            eprintln!("Unknown agent: {agent}");
            eprintln!("  Supported: aider, amazonq, amp, antigravity, claude, cline, codex,");
            eprintln!("    continue, copilot, crush, cursor, emacs, gemini, hermes, jetbrains,");
            eprintln!("    kiro, neovim, opencode, pi, qoder, qoderwork, qwen, roo, sublime,");
            eprintln!("    trae, verdent, vscode, windsurf, zed");
            std::process::exit(1);
        }
    }
}

pub fn install_agent_project_hooks(agent: &str, cwd: &std::path::Path) {
    match agent {
        "claude" | "claude-code" => agents::install_claude_project_hooks(cwd),
        _ => {}
    }
}

fn write_file(path: &std::path::Path, content: &str) {
    if let Err(e) = crate::config_io::write_atomic_with_backup(path, content) {
        tracing::error!("Error writing {}: {e}", path.display());
    }
}

fn is_inside_git_repo(path: &std::path::Path) -> bool {
    let mut p = path;
    loop {
        if p.join(".git").exists() {
            return true;
        }
        match p.parent() {
            Some(parent) => p = parent,
            None => return false,
        }
    }
}

#[cfg(unix)]
fn make_executable(path: &PathBuf) {
    use std::os::unix::fs::PermissionsExt;
    let _ = std::fs::set_permissions(path, std::fs::Permissions::from_mode(0o755));
}

#[cfg(not(unix))]
fn make_executable(_path: &PathBuf) {}

fn full_server_entry(binary: &str) -> serde_json::Value {
    let data_dir = crate::core::data_dir::lean_ctx_data_dir()
        .map(|d| d.to_string_lossy().to_string())
        .unwrap_or_default();
    serde_json::json!({
        "command": binary,
        "env": {
            "LEAN_CTX_DATA_DIR": data_dir,
            "LEAN_CTX_FULL_TOOLS": "1"
        }
    })
}

pub(crate) fn install_mcp_json_agent(
    name: &str,
    display_path: &str,
    config_path: &std::path::Path,
) {
    let binary = resolve_binary_path();
    let entry = full_server_entry(&binary);
    install_named_json_server(name, display_path, config_path, "mcpServers", entry);
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn bash_path_unix_unchanged() {
        assert_eq!(
            to_bash_compatible_path("/usr/local/bin/lean-ctx"),
            "/usr/local/bin/lean-ctx"
        );
    }

    #[test]
    fn bash_path_home_unchanged() {
        assert_eq!(
            to_bash_compatible_path("/home/user/.cargo/bin/lean-ctx"),
            "/home/user/.cargo/bin/lean-ctx"
        );
    }

    #[test]
    fn bash_path_windows_drive_converted() {
        assert_eq!(
            to_bash_compatible_path("C:\\Users\\Fraser\\bin\\lean-ctx.exe"),
            "/c/Users/Fraser/bin/lean-ctx.exe"
        );
    }

    #[test]
    fn bash_path_windows_lowercase_drive() {
        assert_eq!(
            to_bash_compatible_path("D:\\tools\\lean-ctx.exe"),
            "/d/tools/lean-ctx.exe"
        );
    }

    #[test]
    fn bash_path_windows_forward_slashes() {
        assert_eq!(
            to_bash_compatible_path("C:/Users/Fraser/bin/lean-ctx.exe"),
            "/c/Users/Fraser/bin/lean-ctx.exe"
        );
    }

    #[test]
    fn bash_path_bare_name_unchanged() {
        assert_eq!(to_bash_compatible_path("lean-ctx"), "lean-ctx");
    }

    #[test]
    fn normalize_msys2_path() {
        assert_eq!(
            normalize_tool_path("/c/Users/game/Downloads/project"),
            "C:/Users/game/Downloads/project"
        );
    }

    #[test]
    fn normalize_msys2_drive_d() {
        assert_eq!(
            normalize_tool_path("/d/Projects/app/src"),
            "D:/Projects/app/src"
        );
    }

    #[test]
    fn normalize_backslashes() {
        assert_eq!(
            normalize_tool_path("C:\\Users\\game\\project\\src"),
            "C:/Users/game/project/src"
        );
    }

    #[test]
    fn normalize_mixed_separators() {
        assert_eq!(
            normalize_tool_path("C:\\Users/game\\project/src"),
            "C:/Users/game/project/src"
        );
    }

    #[test]
    fn normalize_double_slashes() {
        assert_eq!(
            normalize_tool_path("/home/user//project///src"),
            "/home/user/project/src"
        );
    }

    #[test]
    fn normalize_trailing_slash() {
        assert_eq!(
            normalize_tool_path("/home/user/project/"),
            "/home/user/project"
        );
    }

    #[test]
    fn normalize_root_preserved() {
        assert_eq!(normalize_tool_path("/"), "/");
    }

    #[test]
    fn normalize_windows_root_preserved() {
        assert_eq!(normalize_tool_path("C:/"), "C:/");
    }

    #[test]
    fn normalize_unix_path_unchanged() {
        assert_eq!(
            normalize_tool_path("/home/user/project/src/main.rs"),
            "/home/user/project/src/main.rs"
        );
    }

    #[test]
    fn normalize_relative_path_unchanged() {
        assert_eq!(normalize_tool_path("src/main.rs"), "src/main.rs");
    }

    #[test]
    fn normalize_dot_unchanged() {
        assert_eq!(normalize_tool_path("."), ".");
    }

    #[test]
    fn normalize_unc_path_preserved() {
        assert_eq!(
            normalize_tool_path("//server/share/file"),
            "//server/share/file"
        );
    }

    #[test]
    fn cursor_hook_config_has_version_and_object_hooks() {
        let config = serde_json::json!({
            "version": 1,
            "hooks": {
                "preToolUse": [
                    {
                        "matcher": "terminal_command",
                        "command": "lean-ctx hook rewrite"
                    },
                    {
                        "matcher": "read_file|grep|search|list_files|list_directory",
                        "command": "lean-ctx hook redirect"
                    }
                ]
            }
        });

        let json_str = serde_json::to_string_pretty(&config).unwrap();
        let parsed: serde_json::Value = serde_json::from_str(&json_str).unwrap();

        assert_eq!(parsed["version"], 1);
        assert!(parsed["hooks"].is_object());
        assert!(parsed["hooks"]["preToolUse"].is_array());
        assert_eq!(parsed["hooks"]["preToolUse"].as_array().unwrap().len(), 2);
        assert_eq!(
            parsed["hooks"]["preToolUse"][0]["matcher"],
            "terminal_command"
        );
    }

    #[test]
    fn cursor_hook_detects_old_format_needs_migration() {
        let old_format = r#"{"hooks":[{"event":"preToolUse","command":"lean-ctx hook rewrite"}]}"#;
        let has_correct =
            old_format.contains("\"version\"") && old_format.contains("\"preToolUse\"");
        assert!(
            !has_correct,
            "Old format should be detected as needing migration"
        );
    }

    #[test]
    fn gemini_hook_config_has_type_command() {
        let binary = "lean-ctx";
        let rewrite_cmd = format!("{binary} hook rewrite");
        let redirect_cmd = format!("{binary} hook redirect");

        let hook_config = serde_json::json!({
            "hooks": {
                "BeforeTool": [
                    {
                        "hooks": [{
                            "type": "command",
                            "command": rewrite_cmd
                        }]
                    },
                    {
                        "hooks": [{
                            "type": "command",
                            "command": redirect_cmd
                        }]
                    }
                ]
            }
        });

        let parsed = hook_config;
        let before_tool = parsed["hooks"]["BeforeTool"].as_array().unwrap();
        assert_eq!(before_tool.len(), 2);

        let first_hook = &before_tool[0]["hooks"][0];
        assert_eq!(first_hook["type"], "command");
        assert_eq!(first_hook["command"], "lean-ctx hook rewrite");

        let second_hook = &before_tool[1]["hooks"][0];
        assert_eq!(second_hook["type"], "command");
        assert_eq!(second_hook["command"], "lean-ctx hook redirect");
    }

    #[test]
    fn gemini_hook_old_format_detected() {
        let old_format = r#"{"hooks":{"BeforeTool":[{"command":"lean-ctx hook rewrite"}]}}"#;
        let has_new = old_format.contains("hook rewrite")
            && old_format.contains("hook redirect")
            && old_format.contains("\"type\"");
        assert!(!has_new, "Missing 'type' field should trigger migration");
    }

    #[test]
    fn rewrite_script_uses_registry_pattern() {
        let script = generate_rewrite_script("/usr/bin/lean-ctx");
        assert!(script.contains(r"git\ *"), "script missing git pattern");
        assert!(script.contains(r"cargo\ *"), "script missing cargo pattern");
        assert!(script.contains(r"npm\ *"), "script missing npm pattern");
        assert!(
            !script.contains(r"rg\ *"),
            "script should not contain rg pattern"
        );
        assert!(
            script.contains("LEAN_CTX_BIN=\"/usr/bin/lean-ctx\""),
            "script missing binary path"
        );
        assert!(
            script.contains("PowerShell|powershell"),
            "rewrite script must accept PowerShell tool names for Windows compatibility"
        );
    }

    #[test]
    fn compact_rewrite_script_uses_registry_pattern() {
        let script = generate_compact_rewrite_script("/usr/bin/lean-ctx");
        assert!(script.contains(r"git\ *"), "compact script missing git");
        assert!(script.contains(r"cargo\ *"), "compact script missing cargo");
        assert!(
            !script.contains(r"rg\ *"),
            "compact script should not contain rg"
        );
    }

    #[test]
    fn rewrite_scripts_contain_all_registry_commands() {
        let script = generate_rewrite_script("lean-ctx");
        let compact = generate_compact_rewrite_script("lean-ctx");
        for entry in crate::rewrite_registry::REWRITE_COMMANDS {
            if matches!(
                entry.category,
                crate::rewrite_registry::Category::Search
                    | crate::rewrite_registry::Category::FileRead
                    | crate::rewrite_registry::Category::DirList
            ) {
                continue;
            }
            let pattern = if entry.command.contains('-') {
                format!("{}*", entry.command.replace('-', r"\-"))
            } else {
                format!(r"{}\ *", entry.command)
            };
            assert!(
                script.contains(&pattern),
                "rewrite_script missing '{}' (pattern: {})",
                entry.command,
                pattern
            );
            assert!(
                compact.contains(&pattern),
                "compact_rewrite_script missing '{}' (pattern: {})",
                entry.command,
                pattern
            );
        }
    }

    #[test]
    fn codex_is_hybrid() {
        assert_eq!(recommend_hook_mode("codex"), HookMode::Hybrid);
    }

    #[test]
    fn cursor_is_hybrid() {
        assert_eq!(recommend_hook_mode("cursor"), HookMode::Hybrid);
    }

    #[test]
    fn gemini_is_hybrid() {
        assert_eq!(recommend_hook_mode("gemini"), HookMode::Hybrid);
    }

    #[test]
    fn claude_is_hybrid() {
        assert_eq!(recommend_hook_mode("claude"), HookMode::Hybrid);
    }

    #[test]
    fn unknown_agent_falls_back_to_mcp() {
        assert_eq!(recommend_hook_mode("unknown-agent"), HookMode::Mcp);
    }

    #[test]
    fn from_bash_to_native_converts_msys_drive() {
        assert_eq!(
            from_bash_to_native_path("/c/Users/ABC/lean-ctx"),
            "C:/Users/ABC/lean-ctx"
        );
    }

    #[test]
    fn from_bash_to_native_drive_d() {
        assert_eq!(
            from_bash_to_native_path("/d/Program Files/lean-ctx.exe"),
            "D:/Program Files/lean-ctx.exe"
        );
    }

    #[test]
    fn from_bash_to_native_unix_path_unchanged() {
        assert_eq!(
            from_bash_to_native_path("/usr/local/bin/lean-ctx"),
            "/usr/local/bin/lean-ctx"
        );
    }

    #[test]
    fn from_bash_to_native_bare_name() {
        assert_eq!(from_bash_to_native_path("lean-ctx"), "lean-ctx");
    }

    #[test]
    fn roundtrip_windows_path() {
        let native = r"C:\Users\ABC\AppData\Local\lean-ctx\lean-ctx.exe";
        let bash = to_bash_compatible_path(native);
        assert_eq!(bash, "/c/Users/ABC/AppData/Local/lean-ctx/lean-ctx.exe");
        let back = from_bash_to_native_path(&bash);
        assert_eq!(back, "C:/Users/ABC/AppData/Local/lean-ctx/lean-ctx.exe");
    }

    #[test]
    fn roundtrip_unix_path() {
        let native = "/usr/local/bin/lean-ctx";
        let bash = to_bash_compatible_path(native);
        assert_eq!(bash, native);
        let back = from_bash_to_native_path(&bash);
        assert_eq!(back, native);
    }
}