from collections.abc import Mapping
from typing import Any

from flask import Blueprint, current_app, jsonify, render_template, request

from .binding import BindingService
from .bitrix import BitrixClient


class SiteInputError(ValueError):
    pass


def _field(payload: Mapping[str, Any], name: str) -> str:
    """Проверка существования обязательного поля с именем name."""
    for key in (name, name.lower(), name.upper()):
        value = payload.get(key)
        if value is not None and str(value).strip():
            return str(value).strip()
    raise SiteInputError(f"Не передано поле {name}")


def create_blueprint(
        bindings: BindingService,
        bitrix: BitrixClient,
) -> Blueprint:
    blueprint = Blueprint("site", __name__)

    @blueprint.get("/")
    def index():
        return jsonify(
            service="bitrix-telegram-binding",
            public_url=current_app.config["PUBLIC_BASE_URL"],
        )

    @blueprint.get("/health")
    def health():
        database = current_app.extensions["database"]
        try:
            available = database.ping()
        except Exception:
            available = False
        status = "ok" if available else "error"
        return jsonify(status=status), 200 if available else 503

    @blueprint.post("/bitrix/bind")
    def bind():
        payload = request.get_json(silent=True) or request.form
        refresh_token = _field(payload, "REFRESH_ID")

        # OAuth-ответ дает доверенные ID портала и пользователя.
        auth = bitrix.authorize(refresh_token)
        link = bindings.issue(
            auth.member_id,
            auth.domain,
            auth.user.id,
            auth.access_token,
            auth.refresh_token,
            auth.expires_in,
        )
        return render_template(
            "binding.html",
            user=auth.user,
            link=link,
        )

    return blueprint