import asyncio
import json
from dataclasses import dataclass
from typing import Optional, cast

import httpx

from arcade_asana.constants import ASANA_API_VERSION, ASANA_BASE_URL, ASANA_MAX_CONCURRENT_REQUESTS
from arcade_asana.decorators import clean_asana_response
from arcade_asana.exceptions import AsanaToolExecutionError


@dataclass
class AsanaClient:
    auth_token: str
    base_url: str = ASANA_BASE_URL
    api_version: str = ASANA_API_VERSION
    max_concurrent_requests: int = ASANA_MAX_CONCURRENT_REQUESTS
    _semaphore: asyncio.Semaphore | None = None

    def __post_init__(self) -> None:
        self._semaphore = self._semaphore or asyncio.Semaphore(self.max_concurrent_requests)

    def _build_url(self, endpoint: str, api_version: str | None = None) -> str:
        api_version = api_version or self.api_version
        return f"{self.base_url.rstrip('/')}/{api_version.strip('/')}/{endpoint.lstrip('/')}"

    def _build_error_messages(self, response: httpx.Response) -> tuple[str, str]:
        try:
            data = response.json()
            errors = data["errors"]

            if len(errors) == 1:
                error_message = errors[0]["message"]
                developer_message = (
                    f"{errors[0]['message']} | {errors[0]['help']} "
                    f"(HTTP status code: {response.status_code})"
                )
            else:
                errors_concat = "', '".join([error["message"] for error in errors])
                error_message = f"Multiple errors occurred: '{errors_concat}'"
                developer_message = (
                    f"Multiple errors occurred: {json.dumps(errors)} "
                    f"(HTTP status code: {response.status_code})"
                )

        except Exception as e:
            error_message = "Failed to parse Asana error response"
            developer_message = f"Failed to parse Asana error response: {type(e).__name__}: {e!s}"

        return error_message, developer_message

    def _raise_for_status(self, response: httpx.Response) -> None:
        if response.status_code < 300:
            return

        error_message, developer_message = self._build_error_messages(response)

        raise AsanaToolExecutionError(error_message, developer_message)

    def _set_request_body(self, kwargs: dict, data: dict | None, json_data: dict | None) -> dict:
        if data and json_data:
            raise ValueError("Cannot provide both data and json_data")

        if data:
            kwargs["data"] = data

        elif json_data:
            kwargs["json"] = json_data

        return kwargs

    @clean_asana_response
    async def get(
        self,
        endpoint: str,
        params: Optional[dict] = None,
        headers: Optional[dict] = None,
        api_version: str | None = None,
    ) -> dict:
        default_headers = {
            "Authorization": f"Bearer {self.auth_token}",
            "Accept": "application/json",
        }
        headers = {**default_headers, **(headers or {})}

        kwargs = {
            "url": self._build_url(endpoint, api_version),
            "headers": headers,
        }

        if params:
            kwargs["params"] = params

        async with self._semaphore, httpx.AsyncClient() as client:  # type: ignore[union-attr]
            response = await client.get(**kwargs)  # type: ignore[arg-type]
            self._raise_for_status(response)
        return cast(dict, response.json())

    @clean_asana_response
    async def post(
        self,
        endpoint: str,
        data: Optional[dict] = None,
        json_data: Optional[dict] = None,
        files: Optional[dict] = None,
        headers: Optional[dict] = None,
        api_version: str | None = None,
    ) -> dict:
        default_headers = {
            "Authorization": f"Bearer {self.auth_token}",
            "Accept": "application/json",
        }

        if files is None and json_data is not None:
            default_headers["Content-Type"] = "application/json"

        headers = {**default_headers, **(headers or {})}

        kwargs = {
            "url": self._build_url(endpoint, api_version),
            "headers": headers,
        }

        if files is not None:
            kwargs["files"] = files
            if data is not None:
                kwargs["data"] = data
        else:
            kwargs = self._set_request_body(kwargs, data, json_data)

        async with self._semaphore, httpx.AsyncClient() as client:  # type: ignore[union-attr]
            response = await client.post(**kwargs)  # type: ignore[arg-type]
            self._raise_for_status(response)
        return cast(dict, response.json())

    @clean_asana_response
    async def put(
        self,
        endpoint: str,
        data: Optional[dict] = None,
        json_data: Optional[dict] = None,
        headers: Optional[dict] = None,
        api_version: str | None = None,
    ) -> dict:
        headers = headers or {}
        headers["Authorization"] = f"Bearer {self.auth_token}"
        headers["Content-Type"] = "application/json"
        headers["Accept"] = "application/json"

        kwargs = {
            "url": self._build_url(endpoint, api_version),
            "headers": headers,
        }

        kwargs = self._set_request_body(kwargs, data, json_data)

        async with self._semaphore, httpx.AsyncClient() as client:  # type: ignore[union-attr]
            response = await client.put(**kwargs)  # type: ignore[arg-type]
            self._raise_for_status(response)
        return cast(dict, response.json())

    async def get_current_user(self) -> dict:
        response = await self.get("/users/me")
        return cast(dict, response["data"])