from __future__ import annotations

import time
from typing import Any

from flask import jsonify, request
import httpx

from .. import settings
from ..keycloak import admin_client, require_auth, require_portal_admin


def _kc_admin_list_pending_requests(limit: int = 100) -> list[dict[str, Any]]:
    def is_pending(user: dict[str, Any]) -> bool:
        attrs = user.get("attributes") or {}
        if not isinstance(attrs, dict):
            return False
        status = attrs.get("access_request_status")
        if isinstance(status, list) and status:
            return str(status[0]) == "pending"
        if isinstance(status, str):
            return status == "pending"
        return False

    url = f"{settings.KEYCLOAK_ADMIN_URL}/admin/realms/{settings.KEYCLOAK_REALM}/users"

    candidates: list[dict[str, Any]] = []
    for params in (
        {"max": str(limit), "enabled": "false", "q": "access_request_status:pending"},
        {"max": str(limit), "enabled": "false"},
        {"max": str(limit)},
    ):
        try:
            with httpx.Client(timeout=settings.HTTP_CHECK_TIMEOUT_SEC) as client:
                resp = client.get(url, params=params, headers=admin_client().headers())
                resp.raise_for_status()
                users = resp.json()
                if not isinstance(users, list):
                    continue
                candidates = [u for u in users if isinstance(u, dict)]
                break
        except httpx.HTTPStatusError:
            continue

    pending = [u for u in candidates if is_pending(u)]
    return pending[:limit]


def register(app) -> None:
    @app.route("/api/admin/access/requests", methods=["GET"])
    @require_auth
    def admin_list_requests() -> Any:
        ok, resp = require_portal_admin()
        if not ok:
            return resp
        if not admin_client().ready():
            return jsonify({"error": "server not configured"}), 503

        try:
            items = _kc_admin_list_pending_requests()
        except Exception:
            return jsonify({"error": "failed to load requests"}), 502

        output: list[dict[str, Any]] = []
        for user in items:
            attrs = user.get("attributes") or {}
            if not isinstance(attrs, dict):
                attrs = {}
            output.append(
                {
                    "id": user.get("id") or "",
                    "username": user.get("username") or "",
                    "email": user.get("email") or "",
                    "request_code": (attrs.get("access_request_code") or [""])[0],
                    "created_at": (attrs.get("access_request_created_at") or [""])[0],
                    "note": (attrs.get("access_request_note") or [""])[0],
                }
            )
        return jsonify({"requests": output})

    @app.route("/api/admin/access/requests/<username>/approve", methods=["POST"])
    @require_auth
    def admin_approve_request(username: str) -> Any:
        ok, resp = require_portal_admin()
        if not ok:
            return resp
        if not admin_client().ready():
            return jsonify({"error": "server not configured"}), 503

        user = admin_client().find_user(username)
        if not user:
            return jsonify({"error": "user not found"}), 404
        user_id = user.get("id") or ""
        if not user_id:
            return jsonify({"error": "user id missing"}), 502

        full = admin_client().get_user(user_id)
        full["enabled"] = True
        attrs = full.get("attributes") or {}
        if not isinstance(attrs, dict):
            attrs = {}
        attrs["access_request_status"] = ["approved"]
        attrs["access_request_approved_at"] = [str(int(time.time()))]
        full["attributes"] = attrs
        try:
            admin_client().update_user(user_id, full)
        except Exception:
            return jsonify({"error": "failed to enable user"}), 502

        group_id = admin_client().get_group_id("dev")
        if group_id:
            try:
                admin_client().add_user_to_group(user_id, group_id)
            except Exception:
                pass

        if (full.get("email") or "").strip():
            try:
                admin_client().execute_actions_email(user_id, ["UPDATE_PASSWORD"], request.host_url.rstrip("/") + "/")
            except Exception:
                pass

        return jsonify({"ok": True})

    @app.route("/api/admin/access/requests/<username>/deny", methods=["POST"])
    @require_auth
    def admin_deny_request(username: str) -> Any:
        ok, resp = require_portal_admin()
        if not ok:
            return resp
        if not admin_client().ready():
            return jsonify({"error": "server not configured"}), 503

        user = admin_client().find_user(username)
        if not user:
            return jsonify({"ok": True})
        user_id = user.get("id") or ""
        if not user_id:
            return jsonify({"error": "user id missing"}), 502

        full = admin_client().get_user(user_id)
        full["enabled"] = False
        attrs = full.get("attributes") or {}
        if not isinstance(attrs, dict):
            attrs = {}
        attrs["access_request_status"] = ["denied"]
        attrs["access_request_denied_at"] = [str(int(time.time()))]
        full["attributes"] = attrs
        try:
            admin_client().update_user(user_id, full)
        except Exception:
            return jsonify({"error": "failed to deny user"}), 502

        return jsonify({"ok": True})