import os
from flask import Flask, render_template, redirect, url_for, request, flash, jsonify
from flask_login import LoginManager, login_user, logout_user, login_required, current_user
from flask_admin import Admin, AdminIndexView
from flask_admin.contrib.sqla import ModelView
from datetime import datetime
from config import config
from models import db, Site, Tag, Admin as AdminModel
from utils.website_fetcher import WebsiteFetcher

def create_app(config_name='default'):
    """应用工厂函数"""
    app = Flask(__name__)

    # 加载配置
    app.config.from_object(config[config_name])

    # 初始化数据库
    db.init_app(app)

    # 初始化登录管理
    login_manager = LoginManager()
    login_manager.init_app(app)
    login_manager.login_view = 'admin_login'
    login_manager.login_message = '请先登录'

    @login_manager.user_loader
    def load_user(user_id):
        return AdminModel.query.get(int(user_id))

    # ========== 前台路由 ==========
    @app.route('/')
    def index():
        """首页"""
        # 获取所有启用的标签
        tags = Tag.query.order_by(Tag.sort_order.desc(), Tag.id).all()

        # 获取筛选的标签
        tag_slug = request.args.get('tag')
        selected_tag = None

        if tag_slug:
            selected_tag = Tag.query.filter_by(slug=tag_slug).first()
            if selected_tag:
                sites = Site.query.filter(
                    Site.is_active == True,
                    Site.tags.contains(selected_tag)
                ).order_by(Site.sort_order.desc(), Site.id.desc()).all()
            else:
                sites = []
        else:
            # 获取所有启用的网站
            sites = Site.query.filter_by(is_active=True).order_by(
                Site.sort_order.desc(), Site.id.desc()
            ).all()

        return render_template('index.html', sites=sites, tags=tags, selected_tag=selected_tag)

    @app.route('/site/<slug>')
    def site_detail(slug):
        """网站详情页"""
        site = Site.query.filter_by(slug=slug, is_active=True).first_or_404()

        # 增加浏览次数
        site.view_count += 1
        db.session.commit()

        return render_template('detail.html', site=site)

    # ========== 后台登录路由 ==========
    @app.route('/admin/login', methods=['GET', 'POST'])
    def admin_login():
        """管理员登录"""
        if current_user.is_authenticated:
            return redirect(url_for('admin.index'))

        if request.method == 'POST':
            username = request.form.get('username')
            password = request.form.get('password')

            admin = AdminModel.query.filter_by(username=username).first()

            if admin and admin.check_password(password) and admin.is_active:
                login_user(admin)
                admin.last_login = datetime.now()
                db.session.commit()
                return redirect(url_for('admin.index'))
            else:
                flash('用户名或密码错误', 'error')

        return render_template('admin_login.html')

    @app.route('/admin/logout')
    @login_required
    def admin_logout():
        """管理员登出"""
        logout_user()
        return redirect(url_for('index'))

    # ========== API路由 ==========
    @app.route('/api/fetch-website-info', methods=['POST'])
    @login_required
    def fetch_website_info():
        """抓取网站信息API"""
        try:
            data = request.get_json()
            url = data.get('url', '').strip()

            if not url:
                return jsonify({
                    'success': False,
                    'message': '请提供网站URL'
                }), 400

            # 创建抓取器
            fetcher = WebsiteFetcher(timeout=15)

            # 抓取网站信息
            info = fetcher.fetch_website_info(url)

            if not info:
                return jsonify({
                    'success': False,
                    'message': '无法获取网站信息，请检查URL是否正确或手动填写'
                })

            # 下载Logo（如果有）
            logo_path = None
            if info.get('logo_url'):
                logo_path = fetcher.download_logo(info['logo_url'])

            return jsonify({
                'success': True,
                'data': {
                    'name': info.get('name', ''),
                    'description': info.get('description', ''),
                    'logo': logo_path or info.get('logo_url', '')
                }
            })

        except Exception as e:
            return jsonify({
                'success': False,
                'message': f'抓取失败: {str(e)}'
            }), 500

    # ========== Flask-Admin 配置 ==========
    class SecureModelView(ModelView):
        """需要登录的模型视图"""
        def is_accessible(self):
            return current_user.is_authenticated

        def inaccessible_callback(self, name, **kwargs):
            return redirect(url_for('admin_login'))

    class SecureAdminIndexView(AdminIndexView):
        """需要登录的管理首页"""
        def is_accessible(self):
            return current_user.is_authenticated

        def inaccessible_callback(self, name, **kwargs):
            return redirect(url_for('admin_login'))

    # 网站管理视图
    class SiteAdmin(SecureModelView):
        # 自定义模板
        create_template = 'admin/site/create.html'
        edit_template = 'admin/site/edit.html'

        column_list = ['id', 'name', 'url', 'slug', 'is_active', 'view_count', 'created_at']
        column_searchable_list = ['name', 'url', 'description']
        column_filters = ['is_active', 'tags']
        column_labels = {
            'id': 'ID',
            'name': '网站名称',
            'url': 'URL',
            'slug': 'URL别名',
            'logo': 'Logo',
            'short_desc': '简短描述',
            'description': '详细介绍',
            'features': '主要功能',
            'is_active': '是否启用',
            'view_count': '浏览次数',
            'sort_order': '排序权重',
            'tags': '标签',
            'created_at': '创建时间',
            'updated_at': '更新时间'
        }
        form_columns = ['name', 'url', 'slug', 'logo', 'short_desc', 'description', 'features', 'tags', 'is_active', 'sort_order']

    # 标签管理视图
    class TagAdmin(SecureModelView):
        column_list = ['id', 'name', 'slug', 'description', 'sort_order']
        column_searchable_list = ['name', 'description']
        column_labels = {
            'id': 'ID',
            'name': '标签名称',
            'slug': 'URL别名',
            'description': '标签描述',
            'icon': '图标',
            'sort_order': '排序权重',
            'created_at': '创建时间'
        }
        form_columns = ['name', 'slug', 'description', 'icon', 'sort_order']

    # 管理员视图
    class AdminAdmin(SecureModelView):
        column_list = ['id', 'username', 'email', 'is_active', 'last_login', 'created_at']
        column_searchable_list = ['username', 'email']
        column_filters = ['is_active']
        column_labels = {
            'id': 'ID',
            'username': '用户名',
            'email': '邮箱',
            'is_active': '是否启用',
            'created_at': '创建时间',
            'last_login': '最后登录'
        }
        form_columns = ['username', 'email', 'is_active']

        def on_model_change(self, form, model, is_created):
            # 如果是新建管理员，设置默认密码
            if is_created:
                model.set_password('admin123')  # 默认密码

    # 初始化 Flask-Admin
    admin = Admin(
        app,
        name='ZJPB 焦提示词 - 后台管理',
        template_mode='bootstrap4',
        index_view=SecureAdminIndexView(),
        base_template='admin/custom_base.html'
    )

    admin.add_view(SiteAdmin(Site, db.session, name='网站管理'))
    admin.add_view(TagAdmin(Tag, db.session, name='标签管理'))
    admin.add_view(AdminAdmin(AdminModel, db.session, name='管理员', endpoint='admin_users'))

    return app

if __name__ == '__main__':
    app = create_app(os.getenv('FLASK_ENV', 'development'))
    app.run(host='0.0.0.0', port=5000, debug=True)