"""
Sub-Agent 管理器 - 统一管理 Sub-Agent 创建和执行

统一 evaluate、delegate、explore 三种模式的 Sub-Agent 管理
"""

import asyncio
from typing import Optional, Dict, Any, List
from datetime import datetime

from agent.execution.models import Trace, Message
from agent.execution.trace_id import generate_sub_trace_id
from agent.models.goal import Goal, GoalTree
from agent.services.subagent.signals import Signal


class SubAgentManager:
    """
    统一的 Sub-Agent 管理器

    负责创建、配置和执行不同模式的 Sub-Agent
    """

    def __init__(self, store, signal_bus=None):
        """
        初始化管理器

        Args:
            store: TraceStore 实例
            signal_bus: SignalBus 实例（可选，用于异步通讯）
        """
        self.store = store
        self.signal_bus = signal_bus

    async def execute(
        self,
        mode: str,
        current_trace_id: str,
        current_goal_id: str,
        options: Dict[str, Any],
        continue_from: Optional[str] = None,
        wait: bool = True,
        run_agent=None
    ) -> Dict[str, Any]:
        """
        统一的执行逻辑（信号驱动）

        Args:
            mode: 模式 - "evaluate" | "delegate" | "explore"
            current_trace_id: 当前主 Trace ID
            current_goal_id: 当前 Goal ID
            options: 模式特定的选项
            continue_from: 继承的 trace ID（可选）
            wait: True=等待完成信号, False=立即返回
            run_agent: 运行 Agent 的函数

        Returns:
            根据 mode 返回不同格式的结果
        """
        if not run_agent:
            raise ValueError("run_agent parameter is required")

        # 1. 创建 Sub-Trace
        sub_trace_id = await self._create_sub_trace(
            mode, current_trace_id, current_goal_id,
            options, continue_from
        )

        # 2. 在后台启动 Sub-Agent
        task = asyncio.create_task(
            self._run_subagent_background(
                mode, sub_trace_id, current_trace_id,
                current_goal_id, options, run_agent
            )
        )

        # 3. 发送启动信号
        if self.signal_bus:
            self.signal_bus.emit(Signal(
                type="subagent.start",
                trace_id=sub_trace_id,
                data={
                    "parent_trace_id": current_trace_id,
                    "mode": mode,
                    "task": self._get_task_summary(mode, options)
                }
            ))

        if wait:
            # 4a. 等待完成信号
            return await self._wait_for_completion(
                sub_trace_id, current_trace_id, mode
            )
        else:
            # 4b. 立即返回
            return {
                "subagent_id": sub_trace_id,
                "status": "running",
                "mode": mode
            }

    async def _create_sub_trace(
        self,
        mode: str,
        current_trace_id: str,
        current_goal_id: str,
        options: Dict[str, Any],
        continue_from: Optional[str] = None
    ) -> str:
        """创建 Sub-Trace（不再执行，只创建）"""
        # 1. 配置权限和参数
        allowed_tools = self._get_allowed_tools(mode)
        agent_type = mode if mode != "evaluation" else "evaluator"

        # 2. 更新当前 Goal 为 agent_call 类型
        update_data = {
            "type": "agent_call",
            "agent_call_mode": mode,
            "status": "in_progress"
        }

        # evaluation 模式特殊处理
        if mode == "evaluate":
            update_data["target_goal_id"] = options.get("target_goal_id")
            update_data["evaluation_input"] = options.get("evaluation_input")

        await self.store.update_goal(current_trace_id, current_goal_id, **update_data)

        # 3. 生成或复用 Sub-Trace ID
        if continue_from:
            sub_trace_id = continue_from
            # 验证 trace 存在
            existing_trace = await self.store.get_trace(sub_trace_id)
            if not existing_trace:
                raise ValueError(f"Continue-from trace not found: {continue_from}")
        else:
            sub_trace_id = generate_sub_trace_id(current_trace_id, mode)

        # 4. 构建任务 prompt
        task_prompt = await self._build_task_prompt(mode, options, current_trace_id, continue_from)

        # 5. 创建或复用 Sub-Trace
        if not continue_from:
            # 新建 Sub-Trace
            sub_trace = Trace(
                trace_id=sub_trace_id,
                mode="agent",
                task=task_prompt,
                parent_trace_id=current_trace_id,
                parent_goal_id=current_goal_id,
                agent_type=agent_type,
                context={
                    "allowed_tools": allowed_tools,
                    "max_turns": self._get_max_turns(mode)
                },
                status="running",
                created_at=datetime.now()
            )

            await self.store.create_trace(sub_trace)
            await self.store.update_goal(current_trace_id, current_goal_id, sub_trace_ids=[sub_trace_id])

            # 推送 sub_trace_started 事件
            await self.store.append_event(current_trace_id, "sub_trace_started", {
                "trace_id": sub_trace_id,
                "parent_trace_id": current_trace_id,
                "parent_goal_id": current_goal_id,
                "agent_type": agent_type,
                "task": self._get_task_summary(mode, options)
            })
        else:
            # 连续记忆：在现有 trace 上继续
            await self.store.append_message(sub_trace_id, Message(
                role="user",
                content=task_prompt,
                created_at=datetime.now()
            ))

        return sub_trace_id

    async def _run_subagent_background(
        self,
        mode: str,
        sub_trace_id: str,
        current_trace_id: str,
        current_goal_id: str,
        options: Dict[str, Any],
        run_agent
    ):
        """在后台运行 Sub-Agent，完成后发送信号"""
        try:
            # 获取 trace 对象
            sub_trace = await self.store.get_trace(sub_trace_id)

            # 运行 agent
            result = await run_agent(sub_trace)

            # 获取最终状态
            updated_trace = await self.store.get_trace(sub_trace_id)

            # 格式化结果
            formatted_result = await self._format_result(
                mode, result, updated_trace, options, current_trace_id
            )

            # 发送完成信号
            if self.signal_bus:
                self.signal_bus.emit(Signal(
                    type="subagent.complete",
                    trace_id=sub_trace_id,
                    data={
                        "parent_trace_id": current_trace_id,
                        "result": formatted_result,
                        "status": "completed"
                    }
                ))

            # 推送事件
            await self.store.append_event(current_trace_id, "sub_trace_completed", {
                "trace_id": sub_trace_id,
                "status": "completed",
                "result": formatted_result,
                "stats": {
                    "total_messages": updated_trace.total_messages if updated_trace else 0,
                    "total_tokens": updated_trace.total_tokens if updated_trace else 0,
                    "total_cost": updated_trace.total_cost if updated_trace else 0
                }
            })

            # 更新主 Goal
            await self._update_goal_after_completion(
                mode, current_trace_id, current_goal_id,
                formatted_result, options
            )

        except Exception as e:
            # 发送错误信号
            if self.signal_bus:
                self.signal_bus.emit(Signal(
                    type="subagent.error",
                    trace_id=sub_trace_id,
                    data={
                        "parent_trace_id": current_trace_id,
                        "error": str(e),
                        "mode": mode
                    }
                ))

            # 推送失败事件
            await self.store.append_event(current_trace_id, "sub_trace_completed", {
                "trace_id": sub_trace_id,
                "status": "failed",
                "error": str(e)
            })

            # 更新主 Goal 为失败
            await self.store.update_goal(
                current_trace_id, current_goal_id,
                status="failed",
                summary=f"{mode} 失败: {str(e)}"
            )

    async def _wait_for_completion(
        self,
        sub_trace_id: str,
        current_trace_id: str,
        mode: str,
        timeout: float = 300.0  # 5 分钟超时
    ) -> Dict[str, Any]:
        """等待 Sub-Agent 完成信号"""
        start_time = asyncio.get_event_loop().time()

        while True:
            # 检查超时
            if asyncio.get_event_loop().time() - start_time > timeout:
                raise TimeoutError(f"{mode} Sub-Agent 超时（{timeout}秒）")

            # 检查信号
            if self.signal_bus:
                signals = self.signal_bus.check_buffer(current_trace_id)
                for signal in signals:
                    if signal.trace_id == sub_trace_id:
                        if signal.type == "subagent.complete":
                            return signal.data["result"]
                        elif signal.type == "subagent.error":
                            error = signal.data.get("error", "Unknown error")
                            raise Exception(f"{mode} 失败: {error}")

            # 短暂休眠，避免忙等待
            await asyncio.sleep(0.1)

    def _get_allowed_tools(self, mode: str) -> Optional[List[str]]:
        """根据 mode 返回允许的工具列表"""
        if mode == "evaluate":
            return ["read_file", "grep_content", "glob_files"]
        elif mode == "explore":
            return ["read_file", "grep_content", "glob_files"]
        elif mode == "delegate":
            return None  # 完整权限
        return None

    def _get_max_turns(self, mode: str) -> int:
        """根据 mode 返回最大轮次"""
        if mode == "evaluate":
            return 10
        elif mode == "explore":
            return 20
        elif mode == "delegate":
            return 50
        return 30

    def _get_task_summary(self, mode: str, options: Dict[str, Any]) -> str:
        """获取任务摘要（用于事件）"""
        if mode == "evaluate":
            target_goal_id = options.get("target_goal_id", "unknown")
            return f"评估 Goal {target_goal_id}"
        elif mode == "delegate":
            return options.get("task", "委托任务")
        elif mode == "explore":
            branches = options.get("branches", [])
            return f"探索 {len(branches)} 个方案"
        return "Sub-Agent 任务"

    async def _build_task_prompt(
        self,
        mode: str,
        options: Dict[str, Any],
        current_trace_id: str,
        continue_from: Optional[str]
    ) -> str:
        """构建任务 prompt"""
        if mode == "evaluate":
            return await self._build_evaluation_prompt(options, current_trace_id, continue_from)
        elif mode == "delegate":
            return options.get("task", "")
        elif mode == "explore":
            return self._build_exploration_prompt(options)
        return ""

    async def _build_evaluation_prompt(
        self,
        options: Dict[str, Any],
        current_trace_id: str,
        continue_from: Optional[str]
    ) -> str:
        """构建评估 prompt（参考 evaluate.py）"""
        target_goal_id = options.get("target_goal_id")
        evaluation_input = options.get("evaluation_input", {})
        requirements = options.get("requirements")

        # 获取被评估的 Goal
        goal_tree = await self.store.get_goal_tree(current_trace_id)
        if not goal_tree:
            raise ValueError(f"Goal tree not found for trace: {current_trace_id}")

        target_goal = goal_tree.find(target_goal_id)
        if not target_goal:
            raise ValueError(f"Target goal not found: {target_goal_id}")

        # 获取历史评估结果（如果是连续记忆）
        previous_results = []
        if continue_from and target_goal.evaluation_result:
            previous_results.append(target_goal.evaluation_result)

        # 构建 prompt
        lines = []
        lines.append("# 评估任务")
        lines.append("")
        lines.append("请评估以下任务的执行结果是否满足要求。")
        lines.append("")

        lines.append("## 目标描述")
        lines.append("")
        goal_description = evaluation_input.get("goal_description", target_goal.description)
        lines.append(goal_description)
        lines.append("")

        lines.append("## 执行结果")
        lines.append("")
        actual_result = evaluation_input.get("actual_result")
        if actual_result is not None:
            if isinstance(actual_result, str):
                lines.append(actual_result)
            else:
                import json
                lines.append("```json")
                lines.append(json.dumps(actual_result, ensure_ascii=False, indent=2))
                lines.append("```")
        else:
            lines.append("（无执行结果）")
        lines.append("")

        if requirements:
            lines.append("## 评估要求")
            lines.append("")
            lines.append(requirements)
            lines.append("")

        if previous_results:
            lines.append("## 历史评估记录")
            lines.append("")
            for i, prev in enumerate(previous_results, 1):
                lines.append(f"### 评估 #{i}")
                lines.append(f"- **结论**: {'通过' if prev.get('passed') else '不通过'}")
                lines.append(f"- **理由**: {prev.get('reason', '无')}")
                if prev.get('suggestions'):
                    lines.append(f"- **建议**: {', '.join(prev.get('suggestions', []))}")
                lines.append("")

        lines.append("## 输出格式")
        lines.append("")
        lines.append("请按照以下格式输出评估结果：")
        lines.append("")
        lines.append("## 评估结论")
        lines.append("[通过/不通过]")
        lines.append("")
        lines.append("## 评估理由")
        lines.append("[详细说明为什么通过或不通过]")
        lines.append("")
        lines.append("## 修改建议（如果不通过）")
        lines.append("1. [具体的、可操作的建议1]")
        lines.append("2. [具体的、可操作的建议2]")

        return "\n".join(lines)

    def _build_exploration_prompt(self, options: Dict[str, Any]) -> str:
        """构建探索 prompt"""
        branches = options.get("branches", [])
        background = options.get("background", "")

        lines = []
        lines.append("# 探索任务")
        lines.append("")
        if background:
            lines.append(background)
            lines.append("")

        lines.append("请探索以下方案：")
        for i, branch in enumerate(branches, 1):
            lines.append(f"{i}. {branch}")

        return "\n".join(lines)

    async def _format_result(
        self,
        mode: str,
        result: Any,
        trace: Trace,
        options: Dict[str, Any],
        current_trace_id: str
    ) -> Dict[str, Any]:
        """根据 mode 格式化结果"""
        if mode == "evaluate":
            return self._parse_evaluation_result(result)
        elif mode == "delegate":
            summary = result.get("summary", "任务完成") if isinstance(result, dict) else "任务完成"
            return {
                "summary": summary,
                "stats": {
                    "total_messages": trace.total_messages if trace else 0,
                    "total_tokens": trace.total_tokens if trace else 0,
                    "total_cost": trace.total_cost if trace else 0
                }
            }
        elif mode == "explore":
            return {"summary": result if isinstance(result, str) else "探索完成"}
        return {}

    def _parse_evaluation_result(self, agent_result: Any) -> Dict[str, Any]:
        """解析评估结果（参考 evaluate.py）"""
        last_message = agent_result if agent_result else None

        if not last_message:
            return {
                "passed": False,
                "reason": "评估 Agent 未返回结果",
                "suggestions": [],
                "details": {}
            }

        # 解析评估结论
        passed = False
        if "通过" in last_message and "不通过" not in last_message:
            passed = True
        elif "不通过" in last_message:
            passed = False

        # 提取评估理由
        reason = ""
        if "## 评估理由" in last_message:
            parts = last_message.split("## 评估理由")
            if len(parts) > 1:
                reason_section = parts[1].split("##")[0].strip()
                reason = reason_section

        # 提取修改建议
        suggestions = []
        if "## 修改建议" in last_message:
            parts = last_message.split("## 修改建议")
            if len(parts) > 1:
                suggestions_section = parts[1].split("##")[0].strip()
                for line in suggestions_section.split("\n"):
                    line = line.strip()
                    if line and (line.startswith("-") or line.startswith("*") or line[0].isdigit()):
                        suggestion = line.lstrip("-*0123456789. ").strip()
                        if suggestion:
                            suggestions.append(suggestion)

        return {
            "passed": passed,
            "reason": reason if reason else last_message[:200],
            "suggestions": suggestions,
            "details": {"full_response": last_message}
        }

    async def _update_goal_after_completion(
        self,
        mode: str,
        current_trace_id: str,
        current_goal_id: str,
        result: Dict[str, Any],
        options: Dict[str, Any]
    ):
        """完成后更新 Goal"""
        if mode == "evaluate":
            await self.store.update_goal(
                current_trace_id, current_goal_id,
                evaluation_result=result,
                status="completed",
                summary=f"评估{'通过' if result.get('passed') else '不通过'}"
            )
        elif mode == "delegate":
            task = options.get("task", "任务")
            await self.store.update_goal(
                current_trace_id, current_goal_id,
                status="completed",
                summary=f"已委托完成: {task}"
            )
        elif mode == "explore":
            await self.store.update_goal(
                current_trace_id, current_goal_id,
                status="completed",
                summary="探索完成"
            )