from __future__ import annotations

import logging

logger = logging.getLogger(__name__)


class MattermostError(Exception):
    def __init__(self, status_code: int, message: str, api_error: dict | None = None) -> None:
        self.status_code = status_code
        self.message = message
        self.api_error = api_error
        super().__init__(f"Mattermost API error {status_code}: {message}")


class MattermostNetworkError(MattermostError):
    pass


class MattermostAuthError(MattermostError):
    pass


class MattermostRateLimitError(MattermostError):
    def __init__(self, status_code: int, message: str, retry_after_ms: float = 5000) -> None:
        super().__init__(status_code, message)
        self.retry_after_ms = retry_after_ms


def parse_mattermost_error(response) -> MattermostError:
    body = None
    try:
        body = response.json()
        message = body.get("message", "") or response.text
    except Exception:
        message = response.text

    status_code = response.status_code

    if status_code == 401:
        return MattermostAuthError(status_code, message)
    if status_code == 429:
        retry_after_ms = _parse_retry_after(response) or 5000
        return MattermostRateLimitError(status_code, message, retry_after_ms)
    if status_code >= 500:
        return MattermostNetworkError(status_code, message)

    return MattermostError(status_code, message, body)


def _parse_retry_after(response) -> float | None:
    header = response.headers.get("Retry-After", "")
    if not header:
        return None
    try:
        return float(header) * 1000
    except ValueError:
        return None


def is_retryable_error(status_code: int) -> bool:
    return status_code == 429 or status_code >= 500


def classify_error(
    error: Exception,
) -> tuple[str, bool]:
    if isinstance(error, MattermostAuthError):
        return "auth", False
    if isinstance(error, MattermostRateLimitError):
        return "rate_limit", True
    if isinstance(error, MattermostNetworkError):
        return "network", True
    if isinstance(error, MattermostError):
        if error.status_code == 403:
            return "forbidden", False
        if error.status_code == 404:
            return "not_found", False
        return "api_error", is_retryable_error(error.status_code)
    return "unknown", True