# -*- coding: utf-8 -*-
"""Agent command handler for system commands.

This module handles system commands like /save, /compact, /skills, /reload, etc.
参考CoPaw设计，为EvoAgent提供命令处理能力。
"""
import logging
from abc import ABC, abstractmethod
from dataclasses import dataclass, field
from pathlib import Path
from typing import TYPE_CHECKING, Any, Callable, Dict, List, Optional, Protocol

if TYPE_CHECKING:
    from .agent import EvoAgent

logger = logging.getLogger(__name__)


@dataclass
class CommandResult:
    """命令执行结果"""
    success: bool
    message: str
    data: Dict[str, Any] = field(default_factory=dict)


class CommandContext:
    """命令执行上下文"""

    def __init__(self, agent: "EvoAgent", raw_query: str, args: str = ""):
        self.agent = agent
        self.raw_query = raw_query
        self.args = args
        self.config_name = getattr(agent, "config_name", "default")
        self.agent_id = getattr(agent, "agent_id", "unknown")


class CommandHandler(ABC):
    """命令处理器抽象基类"""

    @abstractmethod
    async def handle(self, ctx: CommandContext) -> CommandResult:
        """处理命令"""
        pass


class SaveCommandHandler(CommandHandler):
    """处理 /save <message> 命令 - 保存内容到MEMORY.md"""

    async def handle(self, ctx: CommandContext) -> CommandResult:
        message = ctx.args.strip()
        if not message:
            return CommandResult(
                success=False,
                message="Usage: /save <message>\n请提供要保存的内容。"
            )

        try:
            memory_path = self._get_memory_path(ctx)
            memory_path.parent.mkdir(parents=True, exist_ok=True)

            timestamp = self._get_timestamp()
            entry = f"\n## {timestamp}\n\n{message}\n"

            with open(memory_path, "a", encoding="utf-8") as f:
                f.write(entry)

            return CommandResult(
                success=True,
                message=f"✅ 内容已保存到 MEMORY.md\n- 路径: {memory_path}\n- 长度: {len(message)} 字符",
                data={"path": str(memory_path), "length": len(message)}
            )
        except Exception as e:
            logger.error(f"Failed to save to MEMORY.md: {e}")
            return CommandResult(
                success=False,
                message=f"❌ 保存失败: {str(e)}"
            )

    def _get_memory_path(self, ctx: CommandContext) -> Path:
        """获取MEMORY.md路径"""
        from backend.agents.skills_manager import SkillsManager
        sm = SkillsManager()
        asset_dir = sm.get_agent_asset_dir(ctx.config_name, ctx.agent_id)
        return asset_dir / "MEMORY.md"

    def _get_timestamp(self) -> str:
        """获取当前时间戳"""
        from datetime import datetime
        return datetime.now().strftime("%Y-%m-%d %H:%M:%S")


class CompactCommandHandler(CommandHandler):
    """处理 /compact 命令 - 压缩记忆"""

    async def handle(self, ctx: CommandContext) -> CommandResult:
        try:
            agent = ctx.agent
            memory_manager = getattr(agent, "memory_manager", None)

            if memory_manager is None:
                return CommandResult(
                    success=False,
                    message="❌ Memory Manager 未启用\n\n- 记忆压缩功能不可用\n- 请在配置中启用 memory_manager"
                )

            messages = await self._get_messages(agent)
            if not messages:
                return CommandResult(
                    success=False,
                    message="⚠️ 没有可压缩的消息\n\n- 当前记忆为空\n- 无需执行压缩"
                )

            compact_content = await memory_manager.compact_memory(messages)
            await self._update_compressed_summary(agent, compact_content)

            return CommandResult(
                success=True,
                message=f"✅ 记忆压缩完成\n\n- 压缩了 {len(messages)} 条消息\n- 摘要长度: {len(compact_content)} 字符",
                data={"message_count": len(messages), "summary_length": len(compact_content)}
            )
        except Exception as e:
            logger.error(f"Failed to compact memory: {e}")
            return CommandResult(
                success=False,
                message=f"❌ 压缩失败: {str(e)}"
            )

    async def _get_messages(self, agent: "EvoAgent") -> List[Any]:
        """获取Agent的记忆消息"""
        memory = getattr(agent, "memory", None)
        if memory is None:
            return []
        return await memory.get_memory() if hasattr(memory, "get_memory") else []

    async def _update_compressed_summary(self, agent: "EvoAgent", content: str) -> None:
        """更新压缩摘要"""
        memory = getattr(agent, "memory", None)
        if memory and hasattr(memory, "update_compressed_summary"):
            await memory.update_compressed_summary(content)


class SkillsListCommandHandler(CommandHandler):
    """处理 /skills list 命令 - 列出已激活技能"""

    async def handle(self, ctx: CommandContext) -> CommandResult:
        try:
            from backend.agents.skills_manager import SkillsManager
            sm = SkillsManager()

            active_skills = sm.list_active_skill_metadata(ctx.config_name, ctx.agent_id)
            catalog = sm.list_agent_skill_catalog(ctx.config_name, ctx.agent_id)

            lines = ["📋 技能列表", ""]

            if active_skills:
                lines.append("✅ 已激活技能:")
                for skill in active_skills:
                    lines.append(f"  • {skill.name} - {skill.description[:50]}...")
            else:
                lines.append("⚠️ 当前没有激活的技能")

            lines.append("")
            lines.append(f"📚 可用技能总数: {len(catalog)}")
            lines.append("💡 使用 /skills enable <name> 启用技能")

            return CommandResult(
                success=True,
                message="\n".join(lines),
                data={
                    "active_count": len(active_skills),
                    "catalog_count": len(catalog),
                    "active": [s.skill_name for s in active_skills]
                }
            )
        except Exception as e:
            logger.error(f"Failed to list skills: {e}")
            return CommandResult(
                success=False,
                message=f"❌ 获取技能列表失败: {str(e)}"
            )


class SkillsEnableCommandHandler(CommandHandler):
    """处理 /skills enable <name> 命令 - 启用技能"""

    async def handle(self, ctx: CommandContext) -> CommandResult:
        skill_name = ctx.args.strip()
        if not skill_name:
            return CommandResult(
                success=False,
                message="Usage: /skills enable <skill_name>\n请提供技能名称。"
            )

        try:
            from backend.agents.skills_manager import SkillsManager
            sm = SkillsManager()

            result = sm.update_agent_skill_overrides(
                ctx.config_name,
                ctx.agent_id,
                enable=[skill_name]
            )

            return CommandResult(
                success=True,
                message=f"✅ 技能已启用: {skill_name}\n\n已启用技能: {', '.join(result['enabled_skills'])}",
                data=result
            )
        except Exception as e:
            logger.error(f"Failed to enable skill: {e}")
            return CommandResult(
                success=False,
                message=f"❌ 启用技能失败: {str(e)}"
            )


class SkillsDisableCommandHandler(CommandHandler):
    """处理 /skills disable <name> 命令 - 禁用技能"""

    async def handle(self, ctx: CommandContext) -> CommandResult:
        skill_name = ctx.args.strip()
        if not skill_name:
            return CommandResult(
                success=False,
                message="Usage: /skills disable <skill_name>\n请提供技能名称。"
            )

        try:
            from backend.agents.skills_manager import SkillsManager
            sm = SkillsManager()

            result = sm.update_agent_skill_overrides(
                ctx.config_name,
                ctx.agent_id,
                disable=[skill_name]
            )

            return CommandResult(
                success=True,
                message=f"✅ 技能已禁用: {skill_name}\n\n已禁用技能: {', '.join(result['disabled_skills'])}",
                data=result
            )
        except Exception as e:
            logger.error(f"Failed to disable skill: {e}")
            return CommandResult(
                success=False,
                message=f"❌ 禁用技能失败: {str(e)}"
            )


class SkillsInstallCommandHandler(CommandHandler):
    """处理 /skills install <name> 命令 - 安装技能"""

    async def handle(self, ctx: CommandContext) -> CommandResult:
        skill_name = ctx.args.strip()
        if not skill_name:
            return CommandResult(
                success=False,
                message="Usage: /skills install <skill_name>\n请提供技能名称。"
            )

        try:
            from backend.agents.skills_manager import SkillsManager
            from backend.agents.skill_loader import load_skill_from_dir
            sm = SkillsManager()

            # 查找技能源目录
            source_dir = self._resolve_skill_source(sm, skill_name)
            if not source_dir:
                return CommandResult(
                    success=False,
                    message=f"❌ 技能未找到: {skill_name}\n\n请检查技能名称是否正确，或技能是否存在于 builtin/customized 目录。"
                )

            # 加载并验证技能
            skill_info = load_skill_from_dir(source_dir)
            if not skill_info:
                return CommandResult(
                    success=False,
                    message=f"❌ 技能加载失败: {skill_name}\n\n技能格式可能不正确。"
                )

            # 安装到agent的installed目录
            installed_root = sm.get_agent_installed_root(ctx.config_name, ctx.agent_id)
            target_dir = installed_root / skill_name

            import shutil
            if target_dir.exists():
                shutil.rmtree(target_dir)
            shutil.copytree(source_dir, target_dir)

            return CommandResult(
                success=True,
                message=f"✅ 技能已安装: {skill_name}\n\n- 名称: {skill_info.get('name', skill_name)}\n- 版本: {skill_info.get('version', 'unknown')}\n- 路径: {target_dir}",
                data={"skill_name": skill_name, "target_dir": str(target_dir)}
            )
        except Exception as e:
            logger.error(f"Failed to install skill: {e}")
            return CommandResult(
                success=False,
                message=f"❌ 安装技能失败: {str(e)}"
            )

    def _resolve_skill_source(self, sm: "SkillsManager", skill_name: str) -> Optional[Path]:
        """解析技能源目录"""
        for root in [sm.customized_root, sm.builtin_root]:
            candidate = root / skill_name
            if candidate.exists() and (candidate / "SKILL.md").exists():
                return candidate
        return None


class ReloadCommandHandler(CommandHandler):
    """处理 /reload 命令 - 重新加载配置"""

    async def handle(self, ctx: CommandContext) -> CommandResult:
        try:
            agent = ctx.agent

            # 重新加载配置
            if hasattr(agent, "reload_config"):
                await agent.reload_config()

            # 重新加载技能
            from backend.agents.skills_manager import SkillsManager
            sm = SkillsManager()

            # 刷新技能同步
            active_root = sm.get_agent_active_root(ctx.config_name, ctx.agent_id)
            if active_root.exists():
                # 清除缓存，强制重新加载
                import shutil
                for item in active_root.iterdir():
                    if item.is_dir():
                        shutil.rmtree(item)

            return CommandResult(
                success=True,
                message="✅ 配置已重新加载\n\n- Agent配置已刷新\n- 技能缓存已清除\n- 请重启对话以应用所有更改",
                data={"config_name": ctx.config_name, "agent_id": ctx.agent_id}
            )
        except Exception as e:
            logger.error(f"Failed to reload config: {e}")
            return CommandResult(
                success=False,
                message=f"❌ 重新加载失败: {str(e)}"
            )


class StatusCommandHandler(CommandHandler):
    """处理 /status 命令 - 显示Agent状态"""

    async def handle(self, ctx: CommandContext) -> CommandResult:
        try:
            agent = ctx.agent

            lines = ["📊 Agent 状态", ""]
            lines.append(f"🆔 Agent ID: {ctx.agent_id}")
            lines.append(f"⚙️  Config: {ctx.config_name}")

            # 模型信息
            model = getattr(agent, "model", None)
            if model:
                lines.append(f"🤖 Model: {model}")

            # 记忆状态
            memory = getattr(agent, "memory", None)
            if memory:
                msg_count = len(getattr(memory, "content", []))
                lines.append(f"💾 Memory: {msg_count} messages")

            # 技能状态
            from backend.agents.skills_manager import SkillsManager
            sm = SkillsManager()
            active_skills = sm.list_active_skill_metadata(ctx.config_name, ctx.agent_id)
            lines.append(f"🔧 Active Skills: {len(active_skills)}")

            # 工具组状态
            toolkit = getattr(agent, "toolkit", None)
            if toolkit:
                groups = getattr(toolkit, "tool_groups", {})
                active_groups = [name for name, g in groups.items() if getattr(g, "active", False)]
                lines.append(f"🛠️  Active Tool Groups: {', '.join(active_groups) if active_groups else 'None'}")

            return CommandResult(
                success=True,
                message="\n".join(lines),
                data={
                    "agent_id": ctx.agent_id,
                    "config_name": ctx.config_name,
                    "active_skills_count": len(active_skills)
                }
            )
        except Exception as e:
            logger.error(f"Failed to get status: {e}")
            return CommandResult(
                success=False,
                message=f"❌ 获取状态失败: {str(e)}"
            )


class HelpCommandHandler(CommandHandler):
    """处理 /help 命令 - 显示帮助"""

    async def handle(self, ctx: CommandContext) -> CommandResult:
        help_text = """📖 EvoAgent 命令帮助

可用命令:
  /save <message>       - 保存内容到 MEMORY.md
  /compact              - 压缩记忆
  /skills list          - 列出已激活技能
  /skills enable <name> - 启用技能
  /skills disable <name>- 禁用技能
  /skills install <name>- 安装技能
  /reload               - 重新加载配置
  /status               - 显示Agent状态
  /help                 - 显示此帮助信息

提示:
  • 所有命令以 / 开头
  • 命令不区分大小写
  • 使用 Tab 键可自动补全命令
"""
        return CommandResult(success=True, message=help_text)


class AgentCommandDispatcher:
    """Agent命令分发器

    参考CoPaw的CommandHandler设计，为EvoAgent提供统一的命令处理入口。
    """

    # 支持的系统命令
    SYSTEM_COMMANDS = frozenset({
        "save", "compact",
        "skills", "reload",
        "status", "help"
    })

    def __init__(self):
        self._handlers: Dict[str, CommandHandler] = {}
        self._subcommands: Dict[str, Dict[str, CommandHandler]] = {}
        self._register_default_handlers()

    def _register_default_handlers(self) -> None:
        """注册默认命令处理器"""
        self._handlers["save"] = SaveCommandHandler()
        self._handlers["compact"] = CompactCommandHandler()
        self._handlers["reload"] = ReloadCommandHandler()
        self._handlers["status"] = StatusCommandHandler()
        self._handlers["help"] = HelpCommandHandler()

        # 子命令: /skills list/enable/disable/install
        self._subcommands["skills"] = {
            "list": SkillsListCommandHandler(),
            "enable": SkillsEnableCommandHandler(),
            "disable": SkillsDisableCommandHandler(),
            "install": SkillsInstallCommandHandler(),
        }

    def is_command(self, query: str | None) -> bool:
        """检查是否为命令

        Args:
            query: 用户输入字符串

        Returns:
            True 如果是系统命令
        """
        if not isinstance(query, str) or not query.startswith("/"):
            return False

        parts = query.strip().lstrip("/").split()
        if not parts:
            return False

        cmd = parts[0].lower()

        # 检查主命令
        if cmd in self.SYSTEM_COMMANDS:
            return True

        return False

    async def handle(self, agent: "EvoAgent", query: str) -> CommandResult:
        """处理命令

        Args:
            agent: EvoAgent实例
            query: 命令字符串

        Returns:
            命令执行结果
        """
        if not self.is_command(query):
            return CommandResult(
                success=False,
                message=f"未知命令: {query}\n使用 /help 查看可用命令。"
            )

        # 解析命令和参数
        parts = query.strip().lstrip("/").split(maxsplit=1)
        cmd = parts[0].lower()
        args = parts[1] if len(parts) > 1 else ""

        logger.info(f"Processing command: {cmd}, args: {args}")

        # 处理子命令 (e.g., /skills list)
        if cmd in self._subcommands:
            sub_parts = args.split(maxsplit=1)
            sub_cmd = sub_parts[0].lower() if sub_parts else ""
            sub_args = sub_parts[1] if len(sub_parts) > 1 else ""

            handlers = self._subcommands[cmd]
            handler = handlers.get(sub_cmd)

            if handler is None:
                available = ", ".join(handlers.keys())
                return CommandResult(
                    success=False,
                    message=f"未知子命令: {sub_cmd}\n可用子命令: {available}"
                )

            ctx = CommandContext(agent, query, sub_args)
            return await handler.handle(ctx)

        # 处理主命令
        handler = self._handlers.get(cmd)
        if handler is None:
            return CommandResult(
                success=False,
                message=f"命令未实现: {cmd}"
            )

        ctx = CommandContext(agent, query, args)
        return await handler.handle(ctx)


# 便捷函数
def create_command_dispatcher() -> AgentCommandDispatcher:
    """创建命令分发器实例"""
    return AgentCommandDispatcher()