"""
pip install fastapi uvicorn aiomysql
"""
import uvicorn
from fastapi import FastAPI, HTTPException
from pydantic import BaseModel

from Util.MySQLUtil import *

"""
API文档访问： http://localhost:8000/docs
该实现包含以下功能：

- 知识库(t_ai_kb)的增删改查接口
- 知识库文件(t_ai_kb_files)的增删改查接口
- 使用MySQLUtil.py中的连接池管理
- 自动生成的Swagger文档
"""

app = FastAPI()

# 知识库模型
class KbModel(BaseModel):
    kb_name: str
    short_name: str
    is_delete: Optional[int] = 0

# 知识库文件模型
class KbFileModel(BaseModel):
    file_name: str
    ext_name: str
    kb_id: int
    is_delete: Optional[int] = 0
    state: Optional[int] = 0

@app.on_event("startup")
async def startup_event():
    app.state.mysql_pool = await init_mysql_pool()

@app.on_event("shutdown")
async def shutdown_event():
    app.state.mysql_pool.close()
    await app.state.mysql_pool.wait_closed()

# 知识库CRUD接口
@app.post("/kb")
async def create_kb(kb: KbModel):
    async with app.state.mysql_pool.acquire() as conn:
        async with conn.cursor() as cur:
            await cur.execute(
                """INSERT INTO t_ai_kb (kb_name, short_name, is_delete) 
                VALUES (%s, %s, %s)""",
                (kb.kb_name, kb.short_name, kb.is_delete)
            )
            await conn.commit()
            return {"id": cur.lastrowid}

@app.get("/kb/{kb_id}")
async def read_kb(kb_id: int):
    async with app.state.mysql_pool.acquire() as conn:
        async with conn.cursor(DictCursor) as cur:
            await cur.execute("SELECT * FROM t_ai_kb WHERE id = %s", (kb_id,))
            result = await cur.fetchone()
            if not result:
                raise HTTPException(status_code=404, detail="Knowledge base not found")
            return result

@app.put("/kb/{kb_id}")
async def update_kb(kb_id: int, kb: KbModel):
    async with app.state.mysql_pool.acquire() as conn:
        async with conn.cursor() as cur:
            await cur.execute(
                """UPDATE t_ai_kb 
                SET kb_name = %s, short_name = %s, is_delete = %s 
                WHERE id = %s""",
                (kb.kb_name, kb.short_name, kb.is_delete, kb_id)
            )
            await conn.commit()
            return {"message": "Knowledge base updated"}

@app.delete("/kb/{kb_id}")
async def delete_kb(kb_id: int):
    async with app.state.mysql_pool.acquire() as conn:
        async with conn.cursor() as cur:
            await cur.execute("DELETE FROM t_ai_kb WHERE id = %s", (kb_id,))
            await conn.commit()
            return {"message": "Knowledge base deleted"}

# 知识库文件CRUD接口
@app.post("/kb_files")
async def create_kb_file(file: KbFileModel):
    async with app.state.mysql_pool.acquire() as conn:
        async with conn.cursor() as cur:
            await cur.execute(
                """INSERT INTO t_ai_kb_files 
                (file_name, ext_name, kb_id, is_delete, state) 
                VALUES (%s, %s, %s, %s, %s)""",
                (file.file_name, file.ext_name, file.kb_id, file.is_delete, file.state)
            )
            await conn.commit()
            return {"id": cur.lastrowid}

@app.get("/kb_files/{file_id}")
async def read_kb_file(file_id: int):
    async with app.state.mysql_pool.acquire() as conn:
        async with conn.cursor(DictCursor) as cur:
            await cur.execute("SELECT * FROM t_ai_kb_files WHERE id = %s", (file_id,))
            result = await cur.fetchone()
            if not result:
                raise HTTPException(status_code=404, detail="File not found")
            return result

@app.put("/kb_files/{file_id}")
async def update_kb_file(file_id: int, file: KbFileModel):
    async with app.state.mysql_pool.acquire() as conn:
        async with conn.cursor() as cur:
            await cur.execute(
                """UPDATE t_ai_kb_files 
                SET file_name = %s, ext_name = %s, kb_id = %s, 
                    is_delete = %s, state = %s 
                WHERE id = %s""",
                (file.file_name, file.ext_name, file.kb_id, 
                 file.is_delete, file.state, file_id)
            )
            await conn.commit()
            return {"message": "File updated"}

@app.delete("/kb_files/{file_id}")
async def delete_kb_file(file_id: int):
    async with app.state.mysql_pool.acquire() as conn:
        async with conn.cursor() as cur:
            await cur.execute("DELETE FROM t_ai_kb_files WHERE id = %s", (file_id,))
            await conn.commit()
            return {"message": "File deleted"}

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