from fastapi import FastAPI, HTTPException
from fastapi.middleware.cors import CORSMiddleware
from pydantic import BaseModel
import json
from fastapi.responses import StreamingResponse
from typing import AsyncGenerator, List, Dict, Any
import uvicorn
import traceback
from xuanzhi_query import router as xz_router
from sql_generator import SQLGenerator
from config import DEFAULT_MODEL_TYPE

app = FastAPI(title="Land Analysis API")
app.include_router(xz_router)
# 配置CORS
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)
server_host = "0.0.0.0"
server_port = 8521


class QueryRequest(BaseModel):
    description: str


class AnalysisResult(BaseModel):
    sql: str
    data: list


@app.post("/land_analysis/stream")
async def stream_land_analysis(request: QueryRequest):
    """
    流式返回土地分析结果
    """

    sql_generator = SQLGenerator(model_type=DEFAULT_MODEL_TYPE)

    async def generate_stream() -> AsyncGenerator[str, None]:
        try:
            # 流式生成SQL
            async for chunk in sql_generator.generate_sql_stream(request.description):
                data = json.loads(chunk)

                if data["type"] == "sql_generation":
                    yield "data: " + chunk + "\n"
                elif data["type"] == "sql_result":
                    sql = data["content"]
                    result = await sql_generator.execute_sql(sql)

                    if result["status"] == "error":
                        error_data = json.dumps({
                            "type": "error",
                            "content": result["content"]
                        }, ensure_ascii=False)
                        yield "data: " + error_data + "\n\n"
                        return

                    result_data = json.dumps({
                        "type": "result",
                        "data": result["data"]
                    }, ensure_ascii=False)
                    yield "data: " + result_data + "\n\n"
                else:
                    yield "data: " + chunk + "\n"

        except Exception as e:
            traceback.print_exc()
            error_data = json.dumps({
                "type": "error",
                "content": str(e)
            }, ensure_ascii=False)
            yield "data: " + error_data + "\n"

    return StreamingResponse(
        generate_stream(),
        media_type="text/event-stream",
        headers={
            "Cache-Control": "no-cache",
            "Connection": "keep-alive",
            "X-Accel-Buffering": "no"
        }
    )


if __name__ == "__main__":
    uvicorn.run(app, host=server_host, port=server_port)
    # uvicorn.run("main:app", host=server_host, port=server_port, workers=5)