package threshold_activity

import (
	"context"
	"time"
)

func (s *service) ListWinners(ctx context.Context, activityID int64, page int, pageSize int) (*WinnerListResponse, error) {
	if page <= 0 {
		page = 1
	}
	if pageSize <= 0 {
		pageSize = 20
	}
	if pageSize > 100 {
		pageSize = 100
	}
	b := s.repo.GetDbR().WithContext(ctx).Table("threshold_activity_winners w").Where("w.activity_id = ?", activityID)
	var total int64
	if err := b.Count(&total).Error; err != nil {
		return nil, err
	}
	var list []WinnerItem
	err := s.repo.GetDbR().WithContext(ctx).Table("threshold_activity_winners w").
		Select("w.id, w.user_id, COALESCE(u.nickname, '') AS nickname, COALESCE(u.avatar, '') AS avatar, w.prize_id, w.reward_type, w.reward_ref_id, w.prize_name_snapshot AS prize_name, w.prize_image_snapshot AS prize_image, w.prize_value_snapshot_cents AS price_cents, w.cost_cents, w.grant_record_type, w.grant_record_id, w.created_at").
		Joins("LEFT JOIN users u ON u.id = w.user_id").
		Where("w.activity_id = ?", activityID).
		Order("w.id DESC").
		Offset((page - 1) * pageSize).
		Limit(pageSize).
		Scan(&list).Error
	return &WinnerListResponse{Page: page, PageSize: pageSize, Total: total, List: list}, err
}

func (s *service) GetCost(ctx context.Context, activityID int64) (*CostSummary, error) {
	var out CostSummary
	err := s.repo.GetDbR().WithContext(ctx).Table("threshold_activity_winners").
		Select("COALESCE(SUM(cost_cents), 0) AS cost_cents, COUNT(*) AS count").
		Where("activity_id = ?", activityID).
		Scan(&out).Error
	return &out, err
}

func (s *service) GetCostSummary(ctx context.Context, startTime *time.Time, endTime *time.Time) (*CostSummary, error) {
	q := s.repo.GetDbR().WithContext(ctx).Table("threshold_activity_winners").Select("COALESCE(SUM(cost_cents), 0) AS cost_cents, COUNT(*) AS count")
	if startTime != nil {
		q = q.Where("created_at >= ?", *startTime)
	}
	if endTime != nil {
		q = q.Where("created_at < ?", *endTime)
	}
	var out CostSummary
	if err := q.Scan(&out).Error; err != nil {
		return nil, err
	}
	return &out, nil
}