"""
Browser-Use 设置工具

检查并安装 browser-use 的依赖（CLI 和 Chromium）
"""

import subprocess
from pathlib import Path
from typing import Optional

from agent.tools import tool, ToolResult


def _check_browser_use_cli() -> bool:
    """检查 browser-use CLI 是否已安装"""
    try:
        result = subprocess.run(
            ["browser-use", "--help"],
            capture_output=True,
            timeout=5
        )
        return result.returncode == 0
    except (FileNotFoundError, subprocess.TimeoutExpired):
        return False


def _check_chromium_installed() -> bool:
    """检查 Chromium 是否已安装（Playwright 缓存）"""
    # macOS
    playwright_cache = Path.home() / "Library" / "Caches" / "ms-playwright"
    if not playwright_cache.exists():
        # Linux
        playwright_cache = Path.home() / ".cache" / "ms-playwright"

    if playwright_cache.exists():
        chromium_dirs = list(playwright_cache.glob("chromium-*"))
        return len(chromium_dirs) > 0

    return False


@tool(description="检查 browser-use 依赖并提供安装指导")
async def check_browser_use(
    uid: str = ""
) -> ToolResult:
    """
    检查 browser-use 的依赖是否已安装

    检查项：
    1. browser-use CLI 是否可用
    2. Chromium 浏览器是否已安装

    Returns:
        ToolResult: 检查结果和安装指导
    """
    cli_installed = _check_browser_use_cli()
    chromium_installed = _check_chromium_installed()

    output = "# Browser-Use Dependency Check\n\n"

    # CLI 状态
    output += "## 1. Browser-Use CLI\n\n"
    if cli_installed:
        output += "✅ **Installed** - `browser-use` command is available\n\n"
    else:
        output += "❌ **Not Installed**\n\n"
        output += "Install with:\n```bash\npip install browser-use\n# or\nuv add browser-use && uv sync\n```\n\n"

    # Chromium 状态
    output += "## 2. Chromium Browser\n\n"
    if chromium_installed:
        output += "✅ **Installed** - Chromium is available in Playwright cache\n\n"
    else:
        output += "❌ **Not Installed**\n\n"
        output += "Install with:\n```bash\nuvx browser-use install\n```\n\n"
        output += "Installation location:\n"
        output += "- macOS: `~/Library/Caches/ms-playwright/`\n"
        output += "- Linux: `~/.cache/ms-playwright/`\n\n"

    # 总结
    if cli_installed and chromium_installed:
        output += "## ✅ Ready to Use\n\n"
        output += "All dependencies are installed. You can now use browser-use commands.\n\n"
        output += "Test with: `browser-use --help`\n"
        status = "ready"
    else:
        output += "## ⚠️ Setup Required\n\n"
        output += "Please complete the installation steps above before using browser-use.\n"
        status = "incomplete"

    return ToolResult(
        title="Browser-Use Dependency Check",
        output=output,
        metadata={
            "cli_installed": cli_installed,
            "chromium_installed": chromium_installed,
            "status": status
        }
    )


@tool(description="安装 browser-use 的 Chromium 浏览器")
async def install_browser_use_chromium(
    uid: str = ""
) -> ToolResult:
    """
    安装 Chromium 浏览器（通过 uvx browser-use install）

    注意：这会下载约 200-300MB 的 Chromium 浏览器

    Returns:
        ToolResult: 安装结果
    """
    # 先检查 CLI 是否可用
    if not _check_browser_use_cli():
        return ToolResult(
            title="Browser-Use CLI Not Found",
            output="Please install browser-use first:\n```bash\npip install browser-use\n```",
            error="browser-use CLI not found"
        )

    # 检查是否已安装
    if _check_chromium_installed():
        return ToolResult(
            title="Chromium Already Installed",
            output="Chromium is already installed in the Playwright cache.\n\n"
                   "Location: `~/Library/Caches/ms-playwright/` (macOS) or `~/.cache/ms-playwright/` (Linux)"
        )

    # 执行安装
    output = "Installing Chromium browser...\n\n"
    output += "This may take a few minutes (downloading ~200-300MB).\n\n"

    try:
        result = subprocess.run(
            ["uvx", "browser-use", "install"],
            capture_output=True,
            text=True,
            timeout=300  # 5 分钟超时
        )

        if result.returncode == 0:
            output += "✅ Installation successful!\n\n"
            output += result.stdout

            return ToolResult(
                title="Chromium Installed",
                output=output,
                metadata={"installed": True}
            )
        else:
            output += f"❌ Installation failed\n\n"
            output += f"Error: {result.stderr}\n"

            return ToolResult(
                title="Installation Failed",
                output=output,
                error=result.stderr
            )

    except subprocess.TimeoutExpired:
        return ToolResult(
            title="Installation Timeout",
            output="Installation timed out after 5 minutes.\n"
                   "Please try running manually:\n```bash\nuvx browser-use install\n```",
            error="Timeout"
        )
    except Exception as e:
        return ToolResult(
            title="Installation Error",
            output=f"Unexpected error: {str(e)}\n\n"
                   "Please try running manually:\n```bash\nuvx browser-use install\n```",
            error=str(e)
        )