"""
元宝全自动代理 v2 - 智能工具调用

核心改进：
1. 元宝主动输出工具调用标记（JSON 格式）
2. Agent 拦截标记，执行工具，将结果返回给元宝
3. 支持多轮工具调用直到任务完成
4. 更自然的对话体验

工作流程：
用户提问 → 元宝分析 → 输出工具调用标记 → Agent 拦截执行 → 
结果返回元宝 → 元宝继续分析/输出新标记 → ... → 最终答案
"""

import asyncio
import json
import re
import subprocess
import time
from dataclasses import dataclass, field
from pathlib import Path
from typing import Optional, Callable, Any

from playwright.async_api import async_playwright, Page, BrowserContext

YUANBAO_URL = "https://yuanbao.tencent.com/chat"

# 工具调用标记格式
TOOL_CALL_START = "<<<TOOL_CALL"
TOOL_CALL_END = "TOOL_CALL>>>"


# ============ 数据模型 ============

@dataclass
class ToolCall:
    """工具调用请求"""
    tool: str
    args: list
    call_id: str = ""


@dataclass
class ToolResult:
    """工具执行结果"""
    call_id: str
    success: bool
    content: str


# ============ 工具注册表 ============

class ToolRegistry:
    """工具注册与管理"""
    
    def __init__(self):
        self._tools: dict[str, Callable] = {}
        self._schemas: dict[str, dict] = {}
    
    def register(self, name: str, schema: dict):
        """注册工具装饰器"""
        def decorator(func: Callable):
            self._tools[name] = func
            self._schemas[name] = schema
            return func
        return decorator
    
    def execute(self, tool_name: str, args: list) -> ToolResult:
        """执行工具"""
        if tool_name not in self._tools:
            return ToolResult(
                call_id="",
                success=False,
                content=f"未知工具: {tool_name}。可用工具: {list(self._tools.keys())}"
            )
        
        try:
            result = self._tools[tool_name](*args)
            return ToolResult(call_id="", success=True, content=str(result))
        except Exception as e:
            return ToolResult(call_id="", success=False, content=f"执行失败: {e}")
    
    def get_schemas(self) -> dict:
        """获取所有工具 schema"""
        return self._schemas


# 全局工具注册表
registry = ToolRegistry()


# ============ 工具实现 ============

@registry.register("read_file", {
    "description": "读取本地文件内容",
    "parameters": [
        {"name": "path", "type": "string", "description": "文件路径"}
    ]
})
def tool_read_file(path: str) -> str:
    try:
        file_path = Path(path).expanduser().resolve()
        if not file_path.exists():
            return f"[错误] 文件不存在: {path}"
        content = file_path.read_text(encoding="utf-8", errors="ignore")
        if len(content) > 8000:
            content = content[:8000] + f"\n... (已截断，共 {len(content)} 字符)"
        return content
    except Exception as e:
        return f"[错误] {e}"


@registry.register("write_file", {
    "description": "写入内容到本地文件",
    "parameters": [
        {"name": "path", "type": "string", "description": "文件路径"},
        {"name": "content", "type": "string", "description": "文件内容"}
    ]
})
def tool_write_file(path: str, content: str) -> str:
    try:
        file_path = Path(path).expanduser().resolve()
        file_path.parent.mkdir(parents=True, exist_ok=True)
        file_path.write_text(content, encoding="utf-8")
        return f"[成功] 文件已写入: {path}"
    except Exception as e:
        return f"[错误] {e}"


@registry.register("list_dir", {
    "description": "列出目录内容",
    "parameters": [
        {"name": "path", "type": "string", "description": "目录路径", "default": "."}
    ]
})
def tool_list_dir(path: str = ".") -> str:
    try:
        dir_path = Path(path).expanduser().resolve()
        if not dir_path.exists():
            return f"[错误] 目录不存在: {path}"
        items = []
        for item in sorted(dir_path.iterdir()):
            prefix = "[DIR]" if item.is_dir() else "[FILE]"
            size = ""
            if item.is_file():
                try:
                    size_bytes = item.stat().st_size
                    size = f" ({size_bytes:,} bytes)"
                except:
                    pass
            items.append(f"{prefix} {item.name}{size}")
        return "\n".join(items[:100])
    except Exception as e:
        return f"[错误] {e}"


@registry.register("run_command", {
    "description": "执行本地命令",
    "parameters": [
        {"name": "command", "type": "string", "description": "要执行的命令"}
    ]
})
def tool_run_command(command: str) -> str:
    try:
        result = subprocess.run(
            command,
            shell=True,
            capture_output=True,
            text=True,
            timeout=30,
            encoding="utf-8",
            errors="ignore"
        )
        output = result.stdout
        if result.stderr:
            output += f"\n[stderr] {result.stderr}"
        if len(output) > 8000:
            output = output[:8000] + f"\n... (已截断)"
        return f"[退出码: {result.returncode}]\n{output}"
    except subprocess.TimeoutExpired:
        return "[错误] 命令执行超时"
    except Exception as e:
        return f"[错误] {e}"


@registry.register("search_files", {
    "description": "搜索文件内容",
    "parameters": [
        {"name": "pattern", "type": "string", "description": "搜索模式"},
        {"name": "path", "type": "string", "description": "搜索路径", "default": "."}
    ]
})
def tool_search_files(pattern: str, path: str = ".") -> str:
    """简单文件内容搜索"""
    try:
        import fnmatch
        search_path = Path(path).expanduser().resolve()
        results = []
        
        for file_path in search_path.rglob("*"):
            if file_path.is_file() and not any(p.startswith(".") for p in file_path.parts):
                try:
                    content = file_path.read_text(encoding="utf-8", errors="ignore")
                    if pattern in content:
                        lines = [i+1 for i, line in enumerate(content.split("\n")) if pattern in line]
                        results.append(f"{file_path.relative_to(search_path)}: 行 {lines[:5]}")
                        if len(results) >= 20:
                            results.append("... (结果过多，已截断)")
                            break
                except:
                    continue
        
        return "\n".join(results) if results else "未找到匹配内容"
    except Exception as e:
        return f"[错误] {e}"


# ============ 系统提示词 ============

SYSTEM_PROMPT = f"""你是一个具有本地操作能力的 AI 助手。你可以调用本地工具来帮助用户完成任务。

可用工具及其 schema：
{json.dumps(registry.get_schemas(), indent=2, ensure_ascii=False)}

工具调用规则：
1. 当需要调用工具时，输出以下格式的标记：
   <<<TOOL_CALL
   {{"tool": "工具名", "args": ["参数1", "参数2", ...]}}
   TOOL_CALL>>>

2. 每次只能调用一个工具
3. 等待工具执行结果后再继续
4. 最终结果以自然语言回复用户

示例对话：
用户：帮我看看桌面有什么文件
你：我来查看一下桌面文件。
<<<TOOL_CALL
{{"tool": "list_dir", "args": ["~/Desktop"]}}
TOOL_CALL>>>
[系统注入工具结果...]
你：桌面有以下文件：...
"""


# ============ 元宝页面控制器 ============

class YuanbaoController:
    """控制元宝网页交互"""
    
    def __init__(self, page: Page):
        self.page = page
        self._last_ai_message: Optional[str] = None
    
    async def find_input_box(self):
        """查找输入框"""
        selectors = [
            "div[contenteditable='true'][data-placeholder]",
            "div[contenteditable='true']",
            "textarea[placeholder]",
            "textarea",
        ]
        for sel in selectors:
            try:
                el = await self.page.wait_for_selector(sel, timeout=3000)
                if el:
                    return el
            except Exception:
                continue
        return None
    
    async def send_message(self, content: str):
        """发送消息到元宝"""
        input_box = await self.find_input_box()
        if not input_box:
            print("[v2] 未找到输入框")
            return False
        
        await input_box.click()
        await asyncio.sleep(0.2)
        
        # 清空
        await self.page.keyboard.press("Control+a")
        await self.page.keyboard.press("Delete")
        await asyncio.sleep(0.2)
        
        # 使用 fill 方法一次性填充内容（比分段 type 更可靠）
        try:
            await input_box.fill(content)
            await asyncio.sleep(0.3)
        except Exception as e:
            # 兜底：逐字输入
            print(f"[v2] fill 失败，使用 type: {e}")
            await input_box.type(content, delay=1)
        
        await asyncio.sleep(0.3)
        
        # 发送
        await self._click_send(input_box)
        return True
    
    async def _click_send(self, input_box):
        """点击发送"""
        send_selectors = [
            "button[class*='send']",
            "button[aria-label*='发送']",
            "button[title*='发送']",
        ]
        for sel in send_selectors:
            try:
                btn = self.page.locator(sel).last
                if await btn.is_visible():
                    await btn.click()
                    return
            except Exception:
                continue
        await input_box.press("Enter")
    
    async def get_latest_ai_message(self) -> Optional[str]:
        """获取最新 AI 回复"""
        try:
            text = await self.page.evaluate("""
                () => {
                    const items = document.querySelectorAll('.agent-chat__list__item--ai');
                    if (items.length === 0) return null;
                    
                    // 找最后一个有 speech-text-box 的
                    let lastItem = null;
                    for (let i = items.length - 1; i >= 0; i--) {
                        if (items[i].querySelector('.agent-chat__speech-text-box')) {
                            lastItem = items[i];
                            break;
                        }
                    }
                    if (!lastItem) lastItem = items[items.length - 1];
                    
                    const textBox = lastItem.querySelector('.agent-chat__speech-text');
                    return textBox ? textBox.innerText?.trim() : lastItem.innerText?.trim();
                }
            """)
            return text
        except Exception as e:
            print(f"[v2] 获取 AI 消息失败: {e}")
            return None
    
    async def wait_for_new_ai_message(self, previous: Optional[str] = None, timeout: int = 120) -> Optional[str]:
        """等待新的 AI 消息"""
        deadline = time.time() + timeout
        
        while time.time() < deadline:
            current = await self.get_latest_ai_message()
            if current and current != previous:
                return current
            await asyncio.sleep(1)
        
        return None
    
    def parse_tool_call(self, text: str) -> Optional[ToolCall]:
        """解析工具调用标记"""
        # 支持多行格式，允许标记和 JSON 之间有换行
        pattern = rf'{re.escape(TOOL_CALL_START)}\s*(\{{.*?\}})\s*{re.escape(TOOL_CALL_END)}'
        match = re.search(pattern, text, re.DOTALL)
        
        if match:
            try:
                json_str = match.group(1).strip()
                data = json.loads(json_str)
                return ToolCall(
                    tool=data.get("tool", ""),
                    args=data.get("args", []),
                    call_id=data.get("call_id", "")
                )
            except json.JSONDecodeError as e:
                print(f"[v2] JSON 解析失败: {e}, 内容: {match.group(1)[:200]}")
                return None
        return None


# ============ 主代理 ============

class YuanbaoAgent:
    """元宝全自动代理"""
    
    def __init__(self):
        self.context: Optional[BrowserContext] = None
        self.page: Optional[Page] = None
        self.controller: Optional[YuanbaoController] = None
        self.conversation_history: list[dict] = []
    
    async def run(self):
        """启动代理"""
        print("=" * 60)
        print("  元宝全自动代理 v2")
        print("=" * 60)
        print("\n工作流程:")
        print("  1. 用户在元宝中提问")
        print("  2. 元宝输出工具调用标记")
        print("  3. Agent 拦截并执行本地操作")
        print("  4. 结果返回元宝，继续对话")
        print("\n按 Ctrl+C 退出\n")
        
        async with async_playwright() as p:
            print("[Agent] 启动浏览器...")
            user_data_dir = str(Path.home() / ".yuanbao_agent_profile")
            self.context = await p.chromium.launch_persistent_context(
                user_data_dir=user_data_dir,
                channel="chrome",
                headless=False,
                args=["--start-maximized"],
                no_viewport=True,
            )
            
            self.page = self.context.pages[0] if self.context.pages else await self.context.new_page()
            await self.page.goto(YUANBAO_URL)
            
            print(f"[Agent] 已打开元宝: {YUANBAO_URL}")
            print("[Agent] 请手动登录元宝...")
            
            # 等待登录完成
            await self._wait_for_login()
            
            self.controller = YuanbaoController(self.page)
            
            # 发送系统提示词（作为第一条消息）
            print("[Agent] 发送系统提示词...")
            await self._send_system_prompt()
            
            print("[Agent] 开始监听对话...")
            await self._conversation_loop()
    
    async def _wait_for_login(self):
        """等待用户登录"""
        print("[Agent] 登录完成后按回车继续...")
        loop = asyncio.get_event_loop()
        await loop.run_in_executor(None, input)
    
    async def _send_system_prompt(self):
        """发送系统提示词"""
        # 使用特殊前缀让元宝知道这是系统指令
        prompt = f"""[系统初始化]

{SYSTEM_PROMPT}

---
现在你可以开始帮助用户了。当需要操作本地文件或执行命令时，请使用工具调用标记。"""
        
        await self.controller.send_message(prompt)
        print("[Agent] 系统提示词已发送")
        
        # 等待元宝确认
        await asyncio.sleep(3)
    
    async def _conversation_loop(self):
        """对话主循环"""
        last_ai_msg = None
        
        while True:
            try:
                # 等待新的 AI 消息
                print("[Agent] 等待元宝回复...")
                ai_msg = await self.controller.wait_for_new_ai_message(last_ai_msg, timeout=180)
                
                if not ai_msg:
                    print("[Agent] 等待超时，继续监听...")
                    continue
                
                last_ai_msg = ai_msg
                print(f"[Agent] 收到元宝消息 ({len(ai_msg)} 字符)")
                
                # 检查是否包含工具调用
                tool_call = self.controller.parse_tool_call(ai_msg)
                
                if tool_call:
                    print(f"[Agent] 检测到工具调用: {tool_call.tool}")
                    
                    # 执行工具
                    result = registry.execute(tool_call.tool, tool_call.args)
                    
                    # 构造结果消息
                    result_msg = f"""[工具执行结果]
工具: {tool_call.tool}
参数: {tool_call.args}
成功: {result.success}

{result.content}

请基于以上结果继续。"""
                    
                    print(f"[Agent] 工具执行完成，返回结果...")
                    
                    # 发送结果回元宝
                    await asyncio.sleep(1)
                    await self.controller.send_message(result_msg)
                    
                    # 更新 last_ai_msg 避免重复处理
                    last_ai_msg = None
                else:
                    # 普通回复，记录到历史
                    self.conversation_history.append({
                        "role": "assistant",
                        "content": ai_msg
                    })
                    
            except KeyboardInterrupt:
                print("\n[Agent] 用户中断")
                break
            except Exception as e:
                print(f"[Agent] 错误: {e}")
                await asyncio.sleep(3)


async def main():
    agent = YuanbaoAgent()
    try:
        await agent.run()
    except Exception as e:
        print(f"[Agent] 启动失败: {e}")
        raise


if __name__ == "__main__":
    asyncio.run(main())