from __future__ import annotations

from pathlib import Path
from typing import Any

from fastapi import Body, FastAPI, HTTPException
from fastapi.responses import PlainTextResponse
from pydantic import BaseModel, Field

from submission_common import add_project_to_path

add_project_to_path()

from env.email_triage_env import EmailTriageEnv
from env.task_config import TASK_CONFIGS


class ResetRequest(BaseModel):
    task_id: str = "email_resolution"
    seed: int = 42
    session_id: str = "default"
    scenario_id: str | None = None


class StepRequest(BaseModel):
    session_id: str = "default"
    action: dict[str, Any] = Field(default_factory=dict)


app = FastAPI(
    title="EmailTriageEnv",
    description="Deterministic customer-support email benchmark for OpenEnv.",
    version="1.0.0",
)

_sessions: dict[str, EmailTriageEnv] = {}
_ROOT = Path(__file__).resolve().parent


@app.get("/")
def root() -> dict[str, Any]:
    return {
        "env": "EmailTriageEnv",
        "version": "1.0.0",
        "tasks": ["email_classification", "email_triage", "email_resolution"],
        "endpoints": ["/health", "/reset", "/step", "/state", "/tasks", "/openenv.yaml"],
    }


@app.get("/health")
def health() -> dict[str, str]:
    return {"status": "ok"}


@app.get("/tasks")
def tasks() -> list[dict[str, Any]]:
    return [
        {
            "id": cfg.id,
            "description": cfg.description,
            "difficulty": cfg.difficulty,
            "max_steps": cfg.max_steps,
            "allowed_actions": [action.value for action in cfg.allowed_actions],
        }
        for cfg in TASK_CONFIGS.values()
    ]


@app.post("/reset")
def reset(request: ResetRequest | None = Body(default=None)) -> dict[str, Any]:
    request = request or ResetRequest()
    env = EmailTriageEnv(task_id=request.task_id, seed=request.seed)
    _sessions[request.session_id] = env
    observation = env.reset(scenario_id=request.scenario_id)
    return observation.model_dump(mode="json")


@app.post("/step")
def step(request: StepRequest) -> dict[str, Any]:
    env = _sessions.get(request.session_id)
    if env is None:
        raise HTTPException(status_code=404, detail="Session not found. Call /reset first.")
    observation, reward, done, info = env.step(request.action)
    return {
        "observation": observation.model_dump(mode="json"),
        "reward": reward,
        "done": done,
        "info": info,
    }


@app.get("/state")
def state(session_id: str = "default") -> dict[str, Any]:
    env = _sessions.get(session_id)
    if env is None:
        raise HTTPException(status_code=404, detail="Session not found. Call /reset first.")
    return env.state()


@app.get("/openenv.yaml", response_class=PlainTextResponse)
def get_openenv_yaml() -> str:
    return (_ROOT / "openenv.yaml").read_text(encoding="utf-8")


if __name__ == "__main__":
    import uvicorn

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