#!/usr/bin/env python3
import os
import sys
import platform
import stat
import json
from pathlib import Path

def setup():
    print(f"[ai-log] Detecting OS: {platform.system()}")
    is_windows = platform.system() == "Windows"

    # UNIVERSAL POLYGLOT COMMAND: Works on Linux (Bash), Windows CMD, and PowerShell.
    # Uses sys.executable to always pick the correct Python binary.
    # Uses subprocess.run() directly (no os.system shell overhead).
    # Uses subprocess.DEVNULL for cross-platform stderr suppression
    # (avoids 2>nul which creates junk files on Linux, and 2>/dev/null which fails on CMD).
    # Tries python3 first (Linux default), falls back to python (Windows default).
    def get_universal_cmd(tool):
        logic = "import sys,subprocess;subprocess.run([sys.executable,'scripts/log_hook.py','--tool','" + tool + "'],stderr=subprocess.DEVNULL)"
        return 'python3 -c "' + logic + '" || python -c "' + logic + '"'

    # 1. Setup Git Pre-push Hook
    if Path(".git").exists():
        python_cmd = "python" if is_windows else "python3"
        hook_path = Path(".git/hooks/pre-push")
        hook_path.parent.mkdir(parents=True, exist_ok=True)
        hook_content = f"#!/bin/sh\n{python_cmd} scripts/submit_log.py\nexit 0\n"
        with open(hook_path, "w", newline="\n") as f:
            f.write(hook_content)
        if not is_windows:
            os.chmod(hook_path, os.stat(hook_path).st_mode | stat.S_IEXEC)
        print(f"[ai-log] Git pre-push hook installed.")

    # 2. Update Tool Configs with OS-Specific Command
    def recursive_fix(obj, tool_name):
        if isinstance(obj, dict):
            for k, v in obj.items():
                if k == "command" and isinstance(v, str) and ("log_hook.py" in v):
                    obj[k] = get_universal_cmd(tool_name)
                else:
                    recursive_fix(v, tool_name)
        elif isinstance(obj, list):
            for item in obj:
                recursive_fix(item, tool_name)

    configs = {
        ".codex/hooks.json": "codex",
        ".gemini/settings.json": "gemini",
        ".cursor/hooks.json": "cursor",
        ".claude/settings.json": "claude",
        ".github/hooks/hooks.json": "copilot"
    }

    for path_str, tool in configs.items():
        path = Path(path_str)
        if not path.exists(): continue
        
        try:
            with open(path, "r", encoding="utf-8") as f:
                data = json.load(f)
            
            # Special case for Copilot which has bash/powershell keys
            if tool == "copilot" and "hooks" in data:
                for k in data["hooks"]:
                    for h in data["hooks"][k]:
                        if h.get("type") == "command":
                            h["bash"] = f"python3 scripts/log_hook.py"
                            h["powershell"] = f"python scripts/log_hook.py"
            else:
                recursive_fix(data, tool)
                
            with open(path, "w", newline="\n", encoding="utf-8") as f:
                json.dump(data, f, indent=2)
            print(f"[ai-log] Synchronized {path} (Universal Command)")
        except Exception as e:
            print(f"[ai-log] Failed to update {path}: {e}")

    # 3. Create .ai-log directory
    log_dir = Path(".ai-log")
    log_dir.mkdir(exist_ok=True)
    (log_dir / ".gitkeep").touch()

    print("[ai-log] Setup complete. Repository is now cross-platform and git-safe.")

if __name__ == "__main__":
    setup()