"""
认证蓝图：登录、登出、登录状态校验
"""
from flask import Blueprint, request, redirect, url_for, session, jsonify, make_response, current_app
from werkzeug.security import check_password_hash

from utils.db import get_db
from utils.auth import login_required, is_session_user_valid
from utils.render import render_html

auth = Blueprint('auth', __name__, url_prefix='')


@auth.route('/login', methods=['GET', 'POST'])
def login():
    force_relogin = request.args.get('logout') == '1' or request.args.get('switch') == '1'
    if request.method == 'GET' and force_relogin:
        session.clear()
        response = make_response(render_html('login.html'))
        response.delete_cookie(current_app.config.get('SESSION_COOKIE_NAME', 'session'))
        response.headers['Cache-Control'] = 'no-store, no-cache, must-revalidate, max-age=0'
        return response
    if request.method == 'GET' and session.get('user_id') and is_session_user_valid():
        return redirect(url_for('main.admin_page'))
    if request.method == 'POST':
        session.clear()
        wants_json = request.is_json or request.headers.get('X-Requested-With') == 'XMLHttpRequest'
        data = request.get_json() if request.is_json else request.form
        username = (data.get('username') or '').strip()
        password = data.get('password') or ''
        if not username or not password:
            if wants_json:
                return jsonify({'success': False, 'error': '请输入用户名和密码'})
            return render_html('login.html', error='请输入用户名和密码')
        try:
            conn = get_db()
            with conn.cursor() as cur:
                cur.execute(
                    "SELECT id, password_hash, machine, is_admin FROM users WHERE username = %s",
                    (username,)
                )
                row = cur.fetchone()
            conn.close()
            if row and check_password_hash(row['password_hash'], password):
                session.permanent = True
                session['user_id'] = row['id']
                session['username'] = username
                if wants_json:
                    return jsonify({'success': True, 'redirect': url_for('main.admin_page')})
                return redirect(url_for('main.admin_page'))
        except Exception as exc:
            if wants_json:
                return jsonify({'success': False, 'error': str(exc)})
            return render_html('login.html', error='登录失败，请稍后重试')
        if wants_json:
            return jsonify({'success': False, 'error': '用户名或密码错误'})
        return render_html('login.html', error='用户名或密码错误')
    return render_html('login.html')


@auth.route('/api/auth/check')
@login_required
def api_auth_check():
    """校验登录状态，用于页面加载时判断是否已登录。"""
    if not session.get('user_id'):
        return jsonify({'logged_in': False})
    try:
        conn = get_db()
        with conn.cursor() as cur:
            cur.execute("SELECT machine, is_admin FROM users WHERE id = %s", (session['user_id'],))
            row = cur.fetchone()
        conn.close()
        if not row:
            return jsonify({'logged_in': False})
    except Exception:
        return jsonify({'logged_in': False})
    return jsonify({'logged_in': True, 'redirect': url_for('main.admin_page')})


@auth.route('/logout')
def logout():
    session.clear()
    response = redirect(url_for('auth.login', logout='1'))
    response.delete_cookie(current_app.config.get('SESSION_COOKIE_NAME', 'session'))
    response.headers['Cache-Control'] = 'no-store, no-cache, must-revalidate, max-age=0'
    return response