# -*- coding: utf-8 -*-
"""
智能体状态
"""
from datetime import datetime
from enum import StrEnum
from typing import Any, AsyncGenerator, Dict
from typing import Dict, List

from pydantic import BaseModel, Field
from pydantic_ai import Agent, ThinkingPartDelta
from pydantic_ai._uuid import uuid7
from pydantic_ai._uuid import uuid7
from pydantic_ai.messages import (
    FunctionToolCallEvent,
    FunctionToolResultEvent,
    LoadCapabilityCallPart,
    PartDeltaEvent,
    PartEndEvent,
    PartStartEvent,
    TextPart,
    TextPartDelta,
    ThinkingPart,
    ToolCallPart,
    ToolSearchCallPart,
)
from pydantic_ai.messages import ModelMessage, ModelMessagesTypeAdapter
from pydantic_ai.models.openai import OpenAIChatModel
from pydantic_ai.providers.openai import OpenAIProvider
from pydantic_ai.run import AgentRunResultEvent
import reflex as rx
from sqlmodel import Field as SqlField, SQLModel

from application.states import CreateConversationState, DatabaseState


class ReasoningPartKind(StrEnum):
    """
    推理分片种类
    """

    THINKING = "thinking"
    TOOL_SEARCH = "tool-search"
    CAPABILITY_LOAD = "load-capability"
    TOOL_CALL = "tool-call"
    TEXT = "text"
    TOOL_RETURN = "tool-return"
    RETRY_PROMPT = "retry-prompt"
    RUN_RETURN = "run-return"


class ReasoningPart(BaseModel):
    """
    推理分片内存模型
    """

    kind: ReasoningPartKind = Field(..., description="推理分片种类")
    content: str = Field(default="", description="推理分片内容")


class Dialog(BaseModel):
    """
    对话内存模型
    """

    user_prompt: str = Field(..., description="用户提示词")
    is_reasoning: bool = Field(
        default=False,
        description="推理状态，True 表示正在推理，False 表示推理完成",
    )
    is_collapse_open: bool = Field(
        default=False,
        description="推理面板展开状态，True 表示推理面板展开，False 表示推理面板折叠",
    )
    reasoning_parts: Dict[int, ReasoningPart] = Field(
        default_factory=dict, description="推理分片字典"
    )
    assistant_content: str = Field(default="", description="回复正文")
    is_running: bool = Field(
        default=False,
        description="运行状态，True 表示正在运行，False 表示运行完成",
    )


class Conversation(BaseModel):
    """
    会话内存模型
    """

    description: str = Field(default="新会话", description="会话描述")
    dialogs: Dict[str, Dialog] = Field(default_factory=dict, description="对话字典")


instructions: str = """
# 角色
专业友好AI助手，结构化解答各类问题。

# 输出硬性规则
1. 全文强制标准Markdown，禁止纯文本；不要额外说明排版格式，直接输出内容；
2. 层级使用 `#/##/###`，列表用 `-` 无序列表或数字有序列表；
3. 代码块用 ```语言名``` 包裹；
4. 重点内容标注 **粗体**/*斜体*；
5. 思考、工具日志仅输出文本，适配前端折叠面板，禁止输出HTML标签；
6. 内容分点拆分，排版整洁适配前端Markdown渲染。

# 行文要求
语言通俗，逻辑完整简洁，无多余废话。
"""
# 实例化智能体（因无法序列化故剥离出状态管理）
agent: Agent = Agent(
    model=OpenAIChatModel(
        model_name="deepseek-v4-flash",
        provider=OpenAIProvider(
            base_url="https://tokenhub.tencentmaas.com/v1",
            api_key="sk-D9Y1mCe8VlvNqLuSC4mAjqEwxJ2nW4C0h8a7EPn8kg9RLsHq",
        ),
    ),
    instructions=instructions,
    capabilities=None,
    output_type=str,
    retries=1,
)


class ConversationState(rx.State):
    """
    会话状态
    """

    # 初始化会话字典
    conversations: Dict[str, Conversation] = {str(uuid7()): Conversation()}
    # 获取当前会话唯一标识
    conversation_id: str = next(reversed(conversations.keys()))

    @rx.var
    def get_chats(self) -> Dict[str, Conversation]:
        """
        获取会话字典，用于前端渲染会话历史
        :return: 会话字典
        """
        return dict(reversed(self.conversations.items()))

    @rx.event
    async def create_chat(self, form_data: Dict[str, Any]) -> None:
        """
        新建会话
        :param form_data: 表单数据
        :return: None
        """
        # 获取会话描述
        description = form_data["description"].strip()
        if not description:
            description = "新会话"

        # 新建会话
        self.conversations[str(uuid7())] = Conversation(description=description)
        # 将末位会话唯一标识设置为当前会话唯一标识
        self.conversation_id = next(reversed(self.conversations.keys()))

        # 获取新建会话状态
        create_chat_state = await self.get_state(CreateConversationState)
        # 关闭新建会话模态窗
        create_chat_state.is_open = False

    @rx.event
    def delete_conversation(self, conversation_id: str) -> None:
        """
        删除会话
        :param conversation_id: 会话唯一标识
        :return: None
        """
        if conversation_id not in self.conversations:
            return
        del self.conversations[conversation_id]

        # 删除后，若会话字典为空则创建会话
        if not self.conversations:
            self.conversations[str(uuid7())] = Conversation()

        # 删除后，若当前会话唯一标识不存在则将末位会话唯一标识设置为当前会话唯一标识
        if self.conversation_id not in self.conversations:
            self.conversation_id = next(reversed(self.conversations.keys()))

    @rx.event
    def switch_conversation(self, conversation_id: str) -> None:
        """
        将指定会话唯一标识设置为当前会话唯一标识
        :param conversation_id: 指定会话唯一标识
        :return: None
        """
        if conversation_id not in self.conversations:
            return
        self.conversation_id = conversation_id

    @rx.var
    def get_conversation_description(self) -> str:
        """
        获取当前会话描述，用于前端渲染会话标题
        :return: 当前会话描述
        """
        # 当前会话
        conversation = self.conversations.get(self.conversation_id)
        return conversation.description if conversation else "新会话"

    @rx.var
    def get_dialogs(self) -> Dict[str, Dialog]:
        """
        获取对话字典，用于前端渲染对话历史
        :return: 对话字典
        """
        # 当前会话
        conversation = self.conversations.get(self.conversation_id)
        return conversation.dialogs if conversation else {}

    @rx.var
    def get_running_status(self) -> bool:
        """
        获取当前运行状态
        :return: 当前运行状态（True 表示正在运行，False 表示运行完成）
        """
        # 当前会话
        conversation = self.conversations.get(self.conversation_id)
        if not conversation or not conversation.dialogs:
            return False

        # 末位对话
        dialog = next(reversed(conversation.dialogs.values()))
        return dialog.is_running

    @rx.event
    async def run(self, form_data: dict[str, Any]) -> AsyncGenerator[None]:
        """
        运行
        :param form_data: 表单数据
        :return: AsyncGenerator
        """
        # 当前会话
        conversation = self.conversations.get(self.conversation_id)
        if not conversation:
            return

        # 获取用户提示词
        user_prompt = form_data.get("user_prompt", "").strip()
        if not user_prompt:
            return

        # 获取数据库状态
        database_state = await self.get_state(DatabaseState)
        # 获取消息历史
        message_history = await database_state.get_message_history(
            conversation_id=self.conversation_id
        )

        # 初始化工具调用唯一标识和片段索引映射字典
        tool_call_ids: Dict[str, int] = {}

        # 创建对话
        conversation.dialogs[str(uuid7())] = Dialog(user_prompt=user_prompt)
        # 将末位对话唯一标识、对话设置为当前对话唯一标识、对话
        dialog_id, dialog = next(reversed(conversation.dialogs.items()))
        # 将运行状态设置为正在运行
        dialog.is_running = True
        yield  # 通知前端渲染

        async with agent.run_stream_events(
            conversation_id=self.conversation_id,
            user_prompt=user_prompt,
            message_history=message_history,
        ) as events:
            async for event in events:
                match event:
                    # ========== 开始事件 ==========
                    case PartStartEvent(
                        index=index,
                        part=part,
                        previous_part_kind=previous_part_kind,
                    ):
                        match part:
                            # 思考分片开始事件
                            case ThinkingPart(content=content):
                                # 若上一分片种类为空则将推理状态设置为正在推理、推理面板展开状态设置为展开
                                if not previous_part_kind:
                                    dialog.is_reasoning = True
                                    dialog.is_collapse_open = True

                                dialog.reasoning_parts[index] = ReasoningPart(
                                    kind=ReasoningPartKind.THINKING, content=content
                                )
                                yield

                            # 工具检索分片开始事件
                            case ToolSearchCallPart(tool_call_id=tool_call_id):
                                # 创建工具调用唯一标识与片段索引映射
                                tool_call_ids[tool_call_id] = index

                                dialog.reasoning_parts[index] = ReasoningPart(
                                    kind=ReasoningPartKind.TOOL_SEARCH,
                                    content="正在生成检索关键词",
                                )
                                yield

                            # 能力加载分片开始事件
                            case LoadCapabilityCallPart(tool_call_id=tool_call_id):
                                tool_call_ids[tool_call_id] = index

                                dialog.reasoning_parts[index] = ReasoningPart(
                                    kind=ReasoningPartKind.CAPABILITY_LOAD,
                                    content="正在生成加载参数",
                                )
                                yield

                            # 工具调用分片开始事件
                            case ToolCallPart(tool_call_id=tool_call_id):
                                tool_call_ids[tool_call_id] = index

                                dialog.reasoning_parts[index] = ReasoningPart(
                                    kind=ReasoningPartKind.TOOL_CALL,
                                    content="正在生成调用参数",
                                )
                                yield

                            # 文本分片开始事件
                            case TextPart(content=content):
                                dialog.assistant_content = content
                                yield

                    # ========== 增量事件 ==========
                    case PartDeltaEvent(index=index, delta=delta):
                        match delta:
                            # 思考分片增量事件
                            case ThinkingPartDelta(
                                content_delta=content_delta,
                                    ):
                                dialog.reasoning_parts[index].content += content_delta or ""
                                yield

                            # 文本分片增量事件
                            case TextPartDelta(
                                content_delta=content_delta,
                            ):
                                dialog.assistant_content += content_delta
                                yield

                    # ========== 结束事件 ==========
                    case PartEndEvent(
                        index=index,
                        part=part,
                        next_part_kind=next_part_kind,
                    ):
                        match part:
                            # 思考分片结束事件
                            case ThinkingPart(part_kind=part_kind, content=content):
                                # 若下一分片种类为文本则将推理状态设置为推理完成、推理面板展开状态设置为折叠
                                if next_part_kind == ReasoningPartKind.TEXT:
                                    dialog.is_reasoning = False
                                    dialog.is_collapse_open = False
                                    yield

                    # ========== 函数工具调用事件 ==========
                    case FunctionToolCallEvent(tool_call_id=tool_call_id, part=part):
                        # 获取分片索引
                        index = tool_call_ids[tool_call_id]
                        match dialog.reasoning_parts[index].kind:
                            # 工具检索
                            case ReasoningPartKind.TOOL_SEARCH:
                                dialog.reasoning_parts[index].content = "正在检索"
                                yield

                            # 能力加载
                            case ReasoningPartKind.CAPABILITY_LOAD:
                                dialog.reasoning_parts[index].content = (
                                    f"正在加载能力 {part.tool_name}"
                                )
                                yield

                            # 工具调用
                            case ReasoningPartKind.TOOL_CALL:
                                dialog.reasoning_parts[index].content = (
                                    f"正在调用工具 {part.tool_name}"
                                )
                                yield

                    # ========== 函数工具结果事件 ==========
                    case FunctionToolResultEvent(
                        tool_call_id=tool_call_id,
                        content=content,
                    ):
                        index = tool_call_ids[tool_call_id]
                        match dialog.reasoning_parts[index].kind:
                            # 工具检索
                            case ReasoningPartKind.TOOL_SEARCH:
                                dialog.reasoning_parts[index].content = (
                                    content if isinstance(content, str) else ""
                                )  # 暂仅考虑文本内容
                                yield

                            # 能力加载
                            case ReasoningPartKind.CAPABILITY_LOAD:
                                dialog.reasoning_parts[index].content = "已加载"
                                yield

                            # 工具调用
                            case ReasoningPartKind.TOOL_CALL:
                                dialog.reasoning_parts[index].content = f"已调用"
                                yield

                    # ========== 智能体运行结果事件 ==========
                    case AgentRunResultEvent(result=result):
                        # 保存新增消息
                        await database_state.save_new_messages(
                            conversation_id=self.conversation_id,
                            dialog_id=dialog_id,
                            new_messages=result.new_messages(),
                        )
                        # 将运行状态设置为运行完成
                        dialog.is_running = False
                        yield

    @rx.event
    def toggle_reasoning_panel(self, dialog_id: str) -> None:
        """
        展开/折叠指定运行唯一标识的推理面板
        """
        # 指定运行
        dialog = self.conversations[self.conversation_id].dialogs[dialog_id]
        dialog.is_collapse_open = not dialog.is_collapse_open