from __future__ import annotations

from typing import Optional

from fastapi import Request
from fastapi.responses import JSONResponse
from starlette.middleware.base import BaseHTTPMiddleware

from core.settings import PANEL_ACCESS_PASSWORD
from services.bot_storage_service import _read_bot_config

PANEL_ACCESS_PASSWORD_HEADER = "x-panel-password"
BOT_ACCESS_PASSWORD_HEADER = "X-Bot-Access-Password"
BOT_PANEL_ONLY_SUFFIXES = {"/enable", "/disable", "/deactivate"}


def _extract_bot_id_from_api_path(path: str) -> Optional[str]:
    parts = [p for p in path.split("/") if p.strip()]
    if len(parts) >= 3 and parts[0] == "api" and parts[1] == "bots":
        return parts[2]
    return None


def _get_supplied_panel_password_http(request: Request) -> str:
    header_value = str(request.headers.get(PANEL_ACCESS_PASSWORD_HEADER) or "").strip()
    if header_value:
        return header_value
    query_value = str(request.query_params.get("panel_access_password") or "").strip()
    return query_value


def _get_supplied_bot_access_password_http(request: Request) -> str:
    header_value = str(request.headers.get(BOT_ACCESS_PASSWORD_HEADER) or "").strip()
    if header_value:
        return header_value
    query_value = str(request.query_params.get("bot_access_password") or "").strip()
    return query_value


def _validate_panel_access_password(supplied: str) -> Optional[str]:
    configured = str(PANEL_ACCESS_PASSWORD or "").strip()
    if not configured:
        return None
    candidate = str(supplied or "").strip()
    if not candidate:
        return "Panel access password required"
    if candidate != configured:
        return "Invalid panel access password"
    return None


def _validate_bot_access_password(bot_id: str, supplied: str) -> Optional[str]:
    config = _read_bot_config(bot_id)
    configured = str(config.get("access_password") or "").strip()
    if not configured:
        return None
    candidate = str(supplied or "").strip()
    if not candidate:
        return "Bot access password required"
    if candidate != configured:
        return "Invalid bot access password"
    return None


def _is_bot_panel_management_api_path(path: str, method: str = "GET") -> bool:
    raw = str(path or "").strip()
    verb = str(method or "GET").strip().upper()
    if not raw.startswith("/api/bots/"):
        return False
    bot_id = _extract_bot_id_from_api_path(raw)
    if not bot_id:
        return False
    return (
        raw.endswith("/start")
        or raw.endswith("/stop")
        or raw.endswith("/enable")
        or raw.endswith("/disable")
        or raw.endswith("/deactivate")
        or (verb in {"PUT", "DELETE"} and raw == f"/api/bots/{bot_id}")
    )


def _is_panel_protected_api_path(path: str, method: str = "GET") -> bool:
    raw = str(path or "").strip()
    verb = str(method or "GET").strip().upper()
    if not raw.startswith("/api/"):
        return False
    if raw in {
        "/api/panel/auth/status",
        "/api/panel/auth/login",
        "/api/health",
        "/api/health/cache",
    }:
        return False
    if _is_bot_panel_management_api_path(raw, verb):
        return True
    if _extract_bot_id_from_api_path(raw):
        return False
    return True


class PasswordProtectionMiddleware(BaseHTTPMiddleware):
    async def dispatch(self, request: Request, call_next):
        path = request.url.path
        method = request.method.upper()

        if method == "OPTIONS":
            return await call_next(request)

        bot_id = _extract_bot_id_from_api_path(path)
        if not bot_id:
            if _is_panel_protected_api_path(path, method):
                panel_error = _validate_panel_access_password(_get_supplied_panel_password_http(request))
                if panel_error:
                    return JSONResponse(status_code=401, content={"detail": panel_error})
            return await call_next(request)

        if _is_bot_panel_management_api_path(path, method):
            panel_error = _validate_panel_access_password(_get_supplied_panel_password_http(request))
            if panel_error:
                bot_error = _validate_bot_access_password(bot_id, _get_supplied_bot_access_password_http(request))
                if bot_error:
                    return JSONResponse(status_code=401, content={"detail": bot_error})

        return await call_next(request)