import json
import subprocess
import tempfile
import urllib
import uuid
from io import BytesIO

import fastapi
import uvicorn
from fastapi import FastAPI, HTTPException
from lightrag import QueryParam
from sse_starlette import EventSourceResponse
from starlette.responses import StreamingResponse
from starlette.staticfiles import StaticFiles

from Util.LightRagUtil import *
from Util.PostgreSQLUtil import init_postgres_pool

# 更详细地控制日志输出
logger = logging.getLogger('lightrag')
logger.setLevel(logging.INFO)
handler = logging.StreamHandler()
handler.setFormatter(logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s'))
logger.addHandler(handler)


async def lifespan(app: FastAPI):
    yield

app = FastAPI(lifespan=lifespan)

# 挂载静态文件目录
app.mount("/static", StaticFiles(directory="Static"), name="static")


@app.post("/api/rag")
async def rag(request: fastapi.Request):
    data = await request.json()
    topic = data.get("topic")  # Chinese, Math
    mode = data.get("mode", "hybrid")  # 默认为hybrid模式
    # 拼接路径
    WORKING_PATH = "./Topic/" + topic
    # 查询的问题
    query = data.get("query")
    # 关闭参考资料
    user_prompt = "\n 1、不要输出参考资料 或者 References ！"
    user_prompt = user_prompt + "\n 2、资料中提供化学反应方程式的，严格按提供的Latex公式输出，绝不允许对Latex公式进行修改！"
    user_prompt = user_prompt + "\n 3、如果资料中提供了图片的，需要仔细检查图片下方描述文字是否与主题相关,不相关的不要提供！相关的一定要严格按照原文提供图片输出，不允许省略或不输出！"
    user_prompt = user_prompt + "\n 4、如果问题与提供的知识库内容不符，则明确告诉未在知识库范围内提到！"
    user_prompt = user_prompt + "\n 5、发现输出内容中包含Latex公式的，一定要检查是不是包含了$$或$的包含符号,不能让Latex无包含符号出现！"

    async def generate_response_stream(query: str):
        try:
            rag = await initialize_rag(WORKING_PATH)
            resp = await rag.aquery(
                query=query,
                param=QueryParam(mode=mode, stream=True, user_prompt=user_prompt, enable_rerank=True))

            async for chunk in resp:
                if not chunk:
                    continue
                yield f"data: {json.dumps({'reply': chunk})}\n\n"
                print(chunk, end='', flush=True)
        except Exception as e:
            yield f"data: {json.dumps({'error': str(e)})}\n\n"
        finally:
            # 清理资源
            await rag.finalize_storages()

    return EventSourceResponse(generate_response_stream(query=query))


@app.post("/api/save-word")
async def save_to_word(request: fastapi.Request):
    output_file = None
    try:
        # Parse request data
        try:
            data = await request.json()
            markdown_content = data.get('markdown_content', '')
            if not markdown_content:
                raise ValueError("Empty MarkDown content")
        except Exception as e:
            logger.error(f"Request parsing failed: {str(e)}")
            raise HTTPException(status_code=400, detail=f"Invalid request: {str(e)}")

        # 创建临时Markdown文件
        temp_md = os.path.join(tempfile.gettempdir(), uuid.uuid4().hex + ".md")
        with open(temp_md, "w", encoding="utf-8") as f:
            f.write(markdown_content)

        # 使用pandoc转换
        output_file = os.path.join(tempfile.gettempdir(), "【理想大模型】问答.docx")
        subprocess.run(['pandoc', temp_md, '-o', output_file, '--resource-path=static'], check=True)

        # 读取生成的Word文件
        with open(output_file, "rb") as f:
            stream = BytesIO(f.read())

        # 返回响应
        encoded_filename = urllib.parse.quote("【理想大模型】问答.docx")
        return StreamingResponse(
            stream,
            media_type="application/vnd.openxmlformats-officedocument.wordprocessingml.document",
            headers={"Content-Disposition": f"attachment; filename*=UTF-8''{encoded_filename}"})

    except HTTPException:
        raise
    except Exception as e:
        logger.error(f"Unexpected error: {str(e)}")
        raise HTTPException(status_code=500, detail="Internal server error")
    finally:
        # 清理临时文件
        try:
            if temp_md and os.path.exists(temp_md):
                os.remove(temp_md)
            if output_file and os.path.exists(output_file):
                os.remove(output_file)
        except Exception as e:
            logger.warning(f"Failed to clean up temp files: {str(e)}")


@app.get("/api/tree-data")
async def get_tree_data():
    try:
        pg_pool = await init_postgres_pool()
        async with pg_pool.acquire() as conn:
            # 执行查询
            rows = await conn.fetch("""
                                    SELECT id,
                                           title,
                                           parent_id,
                                           is_leaf,
                                           prerequisite,
                                           related
                                    FROM knowledge_points
                                    ORDER BY parent_id, id
                                    """)
        # 构建节点映射
        nodes = {}
        for row in rows:
            prerequisite_data = json.loads(row[4]) if row[4] else []
            # 转换先修知识格式
            if isinstance(prerequisite_data, list) and len(prerequisite_data) > 0 and isinstance(prerequisite_data[0],
                                                                                                 dict):
                # 已经是新格式
                prerequisites = prerequisite_data
            else:
                # 转换为新格式
                prerequisites = [{"id": str(id), "title": title} for id, title in
                                 (prerequisite_data or [])] if prerequisite_data else None

            nodes[row[0]] = {
                "id": row[0],
                "title": row[1],
                "parent_id": row[2] if row[2] is not None else 0,
                "isParent": not row[3],
                "prerequisite": prerequisites if prerequisites and len(prerequisites) > 0 else None,
                "related": json.loads(row[5]) if row[5] and len(json.loads(row[5])) > 0 else None,
                "open": True
            }

        # 构建树形结构
        tree_data = []
        for node_id, node in nodes.items():
            parent_id = node["parent_id"]
            if parent_id == 0:
                tree_data.append(node)
            else:
                if parent_id in nodes:
                    if "children" not in nodes[parent_id]:
                        nodes[parent_id]["children"] = []
                    nodes[parent_id]["children"].append(node)

        return {"code": 0, "data": tree_data}
    except Exception as e:
        return {"code": 1, "msg": str(e)}


@app.post("/api/update-knowledge")
async def update_knowledge(request: fastapi.Request):
    try:
        data = await request.json()
        node_id = data.get('node_id')
        knowledge = data.get('knowledge', [])
        update_type = data.get('update_type', 'prerequisite')  # 默认为先修知识

        if not node_id:
            raise ValueError("Missing node_id")

        pg_pool = await init_postgres_pool()
        async with pg_pool.acquire() as conn:
            if update_type == 'prerequisite':
                await conn.execute("""
                                   UPDATE knowledge_points
                                   SET prerequisite = $1
                                   WHERE id = $2
                                   """,
                                   json.dumps(
                                       [{"id": p["id"], "title": p["title"]} for p in knowledge],
                                       ensure_ascii=False
                                   ),
                                   node_id)
            else:  # related knowledge
                await conn.execute("""
                                   UPDATE knowledge_points
                                   SET related = $1
                                   WHERE id = $2
                                   """,
                                   json.dumps(
                                       [{"id": p["id"], "title": p["title"]} for p in knowledge],
                                       ensure_ascii=False
                                   ),
                                   node_id)

        return {"code": 0, "msg": "更新成功"}
    except Exception as e:
        logger.error(f"更新知识失败: {str(e)}")
        return {"code": 1, "msg": str(e)}


@app.post("/api/render_html")
async def render_html(request: fastapi.Request):
    data = await request.json()
    html_content = data.get('html_content')
    html_content = html_content.replace("```html", "")
    html_content = html_content.replace("```", "")
    # 创建临时文件
    filename = f"relation_{uuid.uuid4().hex}.html"
    filepath = os.path.join('../static/temp', filename)

    # 确保temp目录存在
    os.makedirs('../static/temp', exist_ok=True)

    # 写入文件
    with open(filepath, 'w', encoding='utf-8') as f:
        f.write(html_content)

    return {
        'success': True,
        'url': f'/static/temp/{filename}'
    }


@app.get("/api/sources")
async def get_sources(page: int = 1, limit: int = 10):
    try:
        pg_pool = await init_postgres_pool()
        async with pg_pool.acquire() as conn:
            # 获取总数
            total = await conn.fetchval("SELECT COUNT(*) FROM t_wechat_source")
            # 获取分页数据
            offset = (page - 1) * limit
            rows = await conn.fetch(
                """
                SELECT id, account_id, account_name, created_at
                FROM t_wechat_source
                ORDER BY created_at DESC
                    LIMIT $1
                OFFSET $2
                """,
                limit, offset
            )

            sources = [
                {
                    "id": row[0],
                    "name": row[1],
                    "type": row[2],
                    "update_time": row[3].strftime("%Y-%m-%d %H:%M:%S") if row[3] else None
                }
                for row in rows
            ]

            return {
                "code": 0,
                "data": {
                    "list": sources,
                    "total": total,
                    "page": page,
                    "limit": limit
                }
            }
    except Exception as e:
        return {"code": 1, "msg": str(e)}


@app.get("/api/articles")
async def get_articles(page: int = 1, limit: int = 10):
    try:
        pg_pool = await init_postgres_pool()
        async with pg_pool.acquire() as conn:
            # 获取总数
            total = await conn.fetchval("SELECT COUNT(*) FROM t_wechat_articles")
            # 获取分页数据
            offset = (page - 1) * limit
            rows = await conn.fetch(
                """
                SELECT a.id,
                       a.title,
                       a.source as name,
                       a.publish_time,
                       a.collection_time,
                       a.url
                FROM t_wechat_articles a
                ORDER BY a.collection_time DESC
                    LIMIT $1
                OFFSET $2
                """,
                limit, offset
            )

            articles = [
                {
                    "id": row[0],
                    "title": row[1],
                    "source": row[2],
                    "publish_date": row[3].strftime("%Y-%m-%d") if row[3] else None,
                    "collect_time": row[4].strftime("%Y-%m-%d %H:%M:%S") if row[4] else None,
                    "url": row[5],
                }
                for row in rows
            ]

            return {
                "code": 0,
                "data": {
                    "list": articles,
                    "total": total,
                    "page": page,
                    "limit": limit
                }
            }
    except Exception as e:
        return {"code": 1, "msg": str(e)}


@app.post("/api/chat")
async def chat(request: fastapi.Request):
    data = await request.json()
    topic = 'ShiJi'
    mode = data.get("mode", "hybrid")  # 默认为hybrid模式
    # 拼接路径
    WORKING_PATH = "./Topic/" + topic
    # 查询的问题
    query = data.get("query")
    # 关闭参考资料
    user_prompt = "\n 1、总结回答时，要注意不要太繁琐！"

    async def generate_response_stream(query: str):
        try:
            rag = await initialize_rag(WORKING_PATH)
            resp = await rag.aquery(
                query=query,
                param=QueryParam(mode=mode, stream=True, user_prompt=user_prompt, enable_rerank=True))

            async for chunk in resp:
                if not chunk:
                    continue
                yield f"data: {json.dumps({'reply': chunk})}\n\n"
                print(chunk, end='', flush=True)
        except Exception as e:
            yield f"data: {json.dumps({'error': str(e)})}\n\n"
        finally:
            # 清理资源
            await rag.finalize_storages()

    return EventSourceResponse(generate_response_stream(query=query))

if __name__ == "__main__":
    uvicorn.run(app, host="0.0.0.0", port=8000)