package business

import (
	"gorm.io/gorm"
	"kra/internal/biz/business"
)

func approvedGamesAvailable(db *gorm.DB) (bool, error) {
	for _, table := range []string{"tab_game", "tab_promote", "tab_promote_apply"} {
		available, err := businessTableAvailable(db, table)
		if err != nil || !available {
			return available, err
		}
	}
	return true, nil
}

// 游戏可选范围来自可见渠道的有效申请，不受统计时是否包含下级的开关影响。
// 用平台和 ID 配对，避免同号游戏或其他商务的申请扩大可选范围。
func approvedGamesQuery(db *gorm.DB, viewer business.UserScope, sources []string) *gorm.DB {
	promotes := ledgerBasePromotes(db, business.LedgerScope{Viewer: viewer, IncludeSub: true, Unrestricted: viewer.All}, business.LedgerFilter{Sources: sources}, "approved_p").Select("approved_p.source_db,approved_p.id")
	// 逐个游戏检查有效申请，命中即停止；非相关 IN 在 MySQL 5.7 会先
	// 物化整张百万级申请表，即使下拉只需要前 50 项也要扫描全部申请。
	applications := db.Table("tab_promote_apply a").Select("1").Where("a.source_db=g.source_db AND a.game_id=g.id AND a.status=1").Where("(a.source_db,a.promote_id) IN (?)", promotes)
	q := db.Table("tab_game g").Where("EXISTS (?)", applications)
	if len(sources) > 0 {
		q = q.Where("g.source_db IN ?", sources)
	}
	return q
}

// Check authorization for the distinct games present in an aggregated report.
func approvedGameKeys(db *gorm.DB, viewer business.UserScope, sources []string, keys []business.AnalyticsKey) (map[business.AnalyticsKey]bool, error) {
	allowed := map[business.AnalyticsKey]bool{}
	for start := 0; start < len(keys); start += 300 {
		var games []struct {
			SourceDB string `gorm:"column:source_db"`
			ID       int64
		}
		q := approvedGamesQuery(db, viewer, sources).Where("(g.source_db,g.id) IN ?", analyticsPairs(keys[start:min(start+300, len(keys))]))
		if err := q.Select("g.source_db,g.id").Scan(&games).Error; err != nil {
			return nil, business.ErrStorage
		}
		for _, game := range games {
			allowed[business.AnalyticsKey{SourceDB: game.SourceDB, ID: game.ID}] = true
		}
	}
	return allowed, nil
}

func migrateApprovedGameIndexes(db *gorm.DB) error {
	return migrateQueryIndexes(db, []businessQueryIndex{
		{"tab_promote_apply", "idx_sw_apply_game_scope", []string{"game_id", "source_db", "status", "promote_id"}},
	})
}