from models import GenerationRecord, Order, db, to_bj_time
from sqlalchemy import func
from datetime import datetime, timedelta

def get_point_stats(user_id, days=7):
    """获取用户积分消耗统计数据 (用于图表)"""
    end_date = datetime.utcnow()
    start_date = end_date - timedelta(days=days-1)
    
    # 1. 获取消耗统计 (从 GenerationRecord)
    # 按天分组汇总结算
    deductions = db.session.query(
        func.date(GenerationRecord.created_at).label('date'),
        func.sum(GenerationRecord.cost).label('total_cost')
    ).filter(
        GenerationRecord.user_id == user_id,
        GenerationRecord.created_at >= start_date.date()
    ).group_by(func.date(GenerationRecord.created_at)).all()
    
    # 2. 获取充值统计 (从 Order)
    incomes = db.session.query(
        func.date(Order.created_at).label('date'),
        func.sum(Order.points).label('total_points')
    ).filter(
        Order.user_id == user_id,
        Order.status == 'PAID',
        Order.created_at >= start_date.date()
    ).group_by(func.date(Order.created_at)).all()
    
    # 3. 补齐日期，生成连续数据
    date_list = [(start_date + timedelta(days=i)).strftime('%m-%d') for i in range(days)]
    deduction_map = {d.date.strftime('%m-%d'): int(d.total_cost or 0) for d in deductions}
    income_map = {i.date.strftime('%m-%d'): int(i.total_points or 0) for i in incomes}
    
    return {
        "labels": date_list,
        "deductions": [deduction_map.get(d, 0) for d in date_list],
        "incomes": [income_map.get(d, 0) for d in date_list]
    }

def get_point_details(user_id, page=1, per_page=20):
    """获取积分变动明细列表"""
    pagination = GenerationRecord.query.filter(
        GenerationRecord.user_id == user_id,
        GenerationRecord.cost > 0
    ).order_by(GenerationRecord.created_at.desc()).paginate(
        page=page, per_page=per_page, error_out=False
    )
    
    details = []
    for r in pagination.items:
        details.append({
            "type": "deduction",
            "desc": r.prompt[:30] + "..." if r.prompt else "AI 生成",
            "model": r.model,
            "change": f"-{r.cost}",
            "time": r.created_at_bj.strftime('%Y-%m-%d %H:%M')
        })
        
    return {
        "items": details,
        "total": pagination.total,
        "pages": pagination.pages,
        "current_page": pagination.page
    }