from __future__ import annotations

import json
from typing import Any
from urllib import parse, request

from .env import SupportTicketEnvironment
from .fixtures import list_task_ids
from .models import SupportTicketAction, SupportTicketStepResult


class SupportTicketEnv:
    def __init__(self, base_url: str | None = None, task_id: str | None = None) -> None:
        self.base_url = base_url.rstrip("/") if base_url else None
        self.task_id = task_id
        self.session_id: str | None = None
        self._local_env = SupportTicketEnvironment(task_id=task_id) if not self.base_url else None

    @classmethod
    def from_docker_image(
        cls,
        image_name: str,
        base_url: str = "http://localhost:8000",
        task_id: str | None = None,
    ) -> "SupportTicketEnv":
        del image_name
        return cls(base_url=base_url, task_id=task_id)

    @classmethod
    def from_env(
        cls,
        repo_id: str,
        base_url: str,
        task_id: str | None = None,
    ) -> "SupportTicketEnv":
        del repo_id
        return cls(base_url=base_url, task_id=task_id)

    def reset(self, task_id: str | None = None) -> SupportTicketStepResult:
        effective_task_id = task_id or self.task_id
        if self._local_env is not None:
            return self._local_env.reset(effective_task_id)

        payload = {}
        if effective_task_id:
            payload["task_id"] = effective_task_id
        if self.session_id:
            payload["session_id"] = self.session_id
        result = self._post_json("/reset", payload)
        self.session_id = result.info.get("session_id")
        return result

    def step(self, action: SupportTicketAction | dict[str, Any]) -> SupportTicketStepResult:
        if self._local_env is not None:
            return self._local_env.step(action)

        payload = {
            "session_id": self.session_id,
            "action": action.model_dump(mode="json") if hasattr(action, "model_dump") else action,
        }
        result = self._post_json("/step", payload)
        self.session_id = result.info.get("session_id", self.session_id)
        return result

    def state(self) -> dict[str, Any]:
        if self._local_env is not None:
            return self._local_env.state()

        if not self.session_id:
            raise RuntimeError("reset() must be called before state() when using HTTP mode.")
        query = parse.urlencode({"session_id": self.session_id})
        with request.urlopen(f"{self.base_url}/state?{query}") as response:
            return json.loads(response.read().decode("utf-8"))

    def close(self) -> None:
        self.session_id = None

    def __enter__(self) -> "SupportTicketEnv":
        return self

    def __exit__(self, exc_type, exc, tb) -> None:
        self.close()
        return None

    @staticmethod
    def list_tasks() -> list[str]:
        return list_task_ids()

    def _post_json(self, path: str, payload: dict[str, Any]) -> SupportTicketStepResult:
        body = json.dumps(payload).encode("utf-8")
        req = request.Request(
            f"{self.base_url}{path}",
            data=body,
            headers={"Content-Type": "application/json"},
            method="POST",
        )
        with request.urlopen(req) as response:
            data = json.loads(response.read().decode("utf-8"))
        return SupportTicketStepResult.model_validate(data)