"""
FastAPI server for SQL Data Analyst OpenEnv.

Provides REST and WebSocket endpoints for HuggingFace Spaces deployment.
"""

from fastapi import FastAPI, WebSocket, WebSocketDisconnect
from pydantic import BaseModel, Field
from typing import Optional, Dict, Any
import json
import asyncio

from env import SQLAnalystEnv, Action


app = FastAPI(title="SQL Data Analyst Environment")

envs: Dict[str, SQLAnalystEnv] = {}


class ResetRequest(BaseModel):
    task_id: str = Field(default="monthly_signups")


class StepRequest(BaseModel):
    session_id: str
    sql_query: Optional[str] = None
    submit_answer: Optional[str] = None


class StateRequest(BaseModel):
    session_id: str


@app.get("/")
async def root():
    return {
        "name": "sql-data-analyst",
        "version": "1.0.0",
        "description": "SQL Data Analyst OpenEnv - RL environment for SQL query generation",
    }


@app.post("/reset")
async def reset(task_id: str = "monthly_signups") -> Dict[str, Any]:
    session_id = task_id

    env = SQLAnalystEnv(task_id=task_id)
    result = env.reset()
    envs[session_id] = env

    return {
        "session_id": session_id,
        "observation": {
            "schema_summary": result.observation.schema_summary,
            "question": result.observation.question,
            "step": result.observation.step,
            "max_steps": result.observation.max_steps,
            "hints": result.observation.hints,
            "done": result.observation.done,
        },
        "reward": result.reward,
        "done": result.done,
    }


@app.post("/step")
async def step(
    session_id: str,
    sql_query: Optional[str] = None,
    submit_answer: Optional[str] = None,
) -> Dict[str, Any]:
    if session_id not in envs:
        return {"error": "Session not found. Call /reset first."}

    env = envs[session_id]

    action = Action(sql_query=sql_query, submit_answer=submit_answer)

    result = env.step(action)

    return {
        "observation": {
            "schema_summary": result.observation.schema_summary,
            "question": result.observation.question,
            "last_query": result.observation.last_query,
            "last_result": {
                "columns": result.observation.last_result.columns
                if result.observation.last_result
                else None,
                "rows": result.observation.last_result.rows
                if result.observation.last_result
                else None,
                "error": result.observation.last_result.error
                if result.observation.last_result
                else None,
            }
            if result.observation.last_result
            else None,
            "last_error": result.observation.last_error,
            "step": result.observation.step,
            "max_steps": result.observation.max_steps,
            "hints": result.observation.hints,
            "done": result.observation.done,
        },
        "reward": result.reward,
        "done": result.done,
        "info": result.info,
    }


@app.post("/state")
async def state(session_id: str) -> Dict[str, Any]:
    if session_id not in envs:
        return {"error": "Session not found. Call /reset first."}

    env = envs[session_id]
    state = env.state()

    return {
        "task_id": state.task_id,
        "difficulty": state.difficulty,
        "step": state.step,
        "max_steps": state.max_steps,
        "query_history": state.query_history,
        "total_reward": state.total_reward,
        "done": state.done,
    }


@app.post("/delete")
async def delete_session(session_id: str) -> Dict[str, str]:
    if session_id in envs:
        del envs[session_id]
        return {"status": "deleted", "session_id": session_id}

    return {"status": "not_found", "session_id": session_id}


@app.websocket("/ws")
async def websocket_endpoint(websocket: WebSocket):
    await websocket.accept()

    session_id = None
    env = None

    try:
        while True:
            data = await websocket.receive_text()
            message = json.loads(data)

            action_type = message.get("type")

            if action_type == "reset":
                task_id = message.get("task_id", "monthly_signups")
                env = SQLAnalystEnv(task_id=task_id)
                result = env.reset()
                session_id = task_id
                envs[session_id] = env

                await websocket.send_json(
                    {
                        "type": "reset",
                        "observation": {
                            "schema_summary": result.observation.schema_summary,
                            "question": result.observation.question,
                            "step": result.observation.step,
                            "max_steps": result.observation.max_steps,
                            "hints": result.observation.hints,
                        },
                        "reward": result.reward,
                        "done": result.done,
                    }
                )

            elif action_type == "step":
                if not env:
                    await websocket.send_json({"error": "Call reset first"})
                    continue

                action = Action(
                    sql_query=message.get("sql_query"),
                    submit_answer=message.get("submit_answer"),
                )

                result = env.step(action)

                await websocket.send_json(
                    {
                        "type": "step",
                        "observation": {
                            "schema_summary": result.observation.schema_summary,
                            "question": result.observation.question,
                            "last_query": result.observation.last_query,
                            "last_result": {
                                "columns": result.observation.last_result.columns
                                if result.observation.last_result
                                else None,
                                "rows": result.observation.last_result.rows
                                if result.observation.last_result
                                else None,
                                "error": result.observation.last_result.error
                                if result.observation.last_result
                                else None,
                            }
                            if result.observation.last_result
                            else None,
                            "step": result.observation.step,
                            "hints": result.observation.hints,
                            "done": result.observation.done,
                        },
                        "reward": result.reward,
                        "done": result.done,
                        "info": result.info,
                    }
                )

            elif action_type == "state":
                if not env:
                    await websocket.send_json({"error": "Call reset first"})
                    continue

                state = env.state()

                await websocket.send_json(
                    {
                        "type": "state",
                        "task_id": state.task_id,
                        "difficulty": state.difficulty,
                        "step": state.step,
                        "max_steps": state.max_steps,
                        "query_history": state.query_history,
                        "total_reward": state.total_reward,
                        "done": state.done,
                    }
                )

            elif action_type == "close":
                if session_id and session_id in envs:
                    del envs[session_id]
                break

    except WebSocketDisconnect:
        pass
    except Exception as e:
        await websocket.send_json({"error": str(e)})


if __name__ == "__main__":
    import uvicorn

    uvicorn.run(app, host="0.0.0.0", port=7860)