from flask import request, jsonify, current_app
from datetime import datetime, timedelta, time
from sqlalchemy import func, and_, not_, text, case
from app import db
from app.models import Product, License, Device, Version, Ticket
from . import api_bp
from .decorators import require_login, require_admin

@api_bp.route('/statistics/overview', methods=['GET'])
@require_login
def get_overview_stats():
    """获取总览统计"""
    try:
        # 优化：使用单个查询获取所有产品统计
        product_stats = db.session.query(
            func.count(Product.product_id).label('total'),
            func.sum(case((Product.status == 1, 1), else_=0)).label('active')
        ).first()
        total_products = product_stats.total or 0
        active_products = product_stats.active or 0

        # 优化：使用单个查询获取所有卡密统计
        license_stats = db.session.query(
            func.count(License.license_id).label('total'),
            func.sum(case((License.status == 1, 1), else_=0)).label('active'),
            func.sum(case((License.type == 0, 1), else_=0)).label('trial')
        ).first()
        total_licenses = license_stats.total or 0
        active_licenses = license_stats.active or 0
        trial_licenses = license_stats.trial or 0

        # 优化：使用单个查询获取设备统计
        device_stats = db.session.query(
            func.count(Device.device_id).label('total')
        ).first()
        total_devices = device_stats.total or 0
        
        # 在线设备统计（7天内验证过）
        start_date = datetime.utcnow() - timedelta(days=7)
        online_devices = db.session.execute(
            text("SELECT COUNT(*) FROM device WHERE last_verify_time IS NOT NULL AND last_verify_time >= :start_date"),
            {"start_date": start_date}
        ).scalar() or 0

        # 优化：使用单个查询获取激活统计
        today = datetime.utcnow().date()
        today_start = datetime.combine(today, time.min)
        today_end = datetime.combine(today, time.max)
        
        # 今日激活数（使用日期范围查询，兼容SQLite）
        today_activations = db.session.query(func.count(License.license_id)).filter(
            License.activate_time.isnot(None),
            License.activate_time >= today_start,
            License.activate_time <= today_end
        ).scalar() or 0
        
        # 本周激活数
        week_activations = db.session.query(func.count(License.license_id)).filter(
            License.activate_time.isnot(None),
            License.activate_time >= start_date
        ).scalar() or 0

        # 工单统计
        total_tickets = db.session.query(func.count(Ticket.ticket_id)).scalar() or 0

        return jsonify({
            'success': True,
            'data': {
                'products': {
                    'total': total_products,
                    'active': active_products
                },
                'licenses': {
                    'total': total_licenses,
                    'active': active_licenses,
                    'trial': trial_licenses,
                    'formal': total_licenses - trial_licenses
                },
                'devices': {
                    'total': total_devices,
                    'online': online_devices,
                    'offline': total_devices - online_devices
                },
                'tickets': {
                    'total': total_tickets
                },
                'activations': {
                    'today': today_activations,
                    'week': week_activations
                }
            }
        })

    except Exception as e:
        current_app.logger.error(f"获取总览统计失败: {str(e)}")
        return jsonify({'success': False, 'message': '服务器内部错误'}), 500

@api_bp.route('/statistics/activations', methods=['GET'])
@require_login
def get_activation_trend():
    """获取激活趋势"""
    try:
        days = request.args.get('days', 30, type=int)
        days = min(days, 365)  # 最多查询一年

        start_date = datetime.utcnow() - timedelta(days=days)

        # 按日期分组统计激活数
        result = db.session.execute(
            text("SELECT DATE(activate_time) as date, COUNT(license_id) as count FROM license WHERE activate_time IS NOT NULL AND activate_time >= :start_date GROUP BY DATE(activate_time) ORDER BY date"),
            {"start_date": start_date}
        ).fetchall()

        # 填充缺失的日期
        activation_data = []
        current_date = start_date.date()
        end_date = datetime.utcnow().date()

        result_dict = {str(r.date): r.count for r in result}

        while current_date <= end_date:
            activation_data.append({
                'date': str(current_date),
                'count': result_dict.get(str(current_date), 0)
            })
            current_date += timedelta(days=1)

        return jsonify({
            'success': True,
            'data': {
                'activations': activation_data,
                'period': f'{days}天'
            }
        })

    except Exception as e:
        current_app.logger.error(f"获取激活趋势失败: {str(e)}")
        return jsonify({'success': False, 'message': '服务器内部错误'}), 500

@api_bp.route('/statistics/products', methods=['GET'])
@require_login
def get_product_stats():
    """获取产品统计信息"""
    try:
        # 获取产品分布数据
        product_stats = db.session.query(
            Product.product_name,
            func.count(License.license_id).label('license_count'),
            func.count(Device.device_id).label('device_count')
        ).outerjoin(License, Product.product_id == License.product_id)\
         .outerjoin(Device, Product.product_id == Device.product_id)\
         .group_by(Product.product_id, Product.product_name)\
         .order_by(func.count(License.license_id).desc())\
         .all()

        # 转换为字典列表
        products_data = []
        for product in product_stats:
            products_data.append({
                'product_name': product.product_name,
                'license_count': product.license_count or 0,
                'device_count': product.device_count or 0
            })

        return jsonify({
            'success': True,
            'data': {
                'products': products_data
            }
        })

    except Exception as e:
        current_app.logger.error(f"获取产品统计失败: {str(e)}")
        return jsonify({'success': False, 'message': '服务器内部错误'}), 500