package packageexpiry

import (
	"context"
	"testing"
	"time"

	"github.com/break/junhong_cmp_fiber/internal/model"
	"github.com/break/junhong_cmp_fiber/internal/testutil"
	"github.com/break/junhong_cmp_fiber/pkg/constants"
	"gorm.io/gorm"
)

func TestCalculate(t *testing.T) {
	location := time.FixedZone("Asia/Shanghai", 8*60*60)
	now := time.Date(2026, 7, 23, 12, 0, 0, 0, location)
	currentExpiry := time.Date(2026, 7, 31, 23, 59, 59, 0, location)
	createdAt := time.Date(2026, 7, 1, 12, 0, 0, 0, location)
	newUsage := func(id uint, status int, priority int) *model.PackageUsage {
		return &model.PackageUsage{
			Model:                modelBase(id, createdAt.Add(time.Duration(id)*time.Second)),
			PackageID:            id,
			Status:               status,
			Priority:             priority,
			ExpiryBaseSnapshot:   constants.PackageExpiryBaseFromActivation,
			CalendarTypeSnapshot: constants.PackageCalendarTypeByDay,
			DurationDaysSnapshot: 3,
		}
	}

	tests := []struct {
		name       string
		usages     []*model.PackageUsage
		packages   map[uint]*model.Package
		wantStatus string
		wantDate   *time.Time
		wantDays   *int
	}{
		{name: "无套餐", wantStatus: constants.PackageExpiryEstimateStatusNone},
		{
			name: "当前套餐", usages: func() []*model.PackageUsage {
				u := newUsage(1, constants.PackageUsageStatusActive, 1)
				u.ExpiresAt = &currentExpiry
				return []*model.PackageUsage{u}
			}(), wantStatus: constants.PackageExpiryEstimateStatusExact, wantDate: &currentExpiry, wantDays: intPointer(8),
		},
		{
			name: "多段队列按下一时刻接续", usages: func() []*model.PackageUsage {
				current := newUsage(1, constants.PackageUsageStatusActive, 1)
				current.ExpiresAt = &currentExpiry
				queued := newUsage(2, constants.PackageUsageStatusPending, 2)
				queued.DurationDaysSnapshot = 3
				return []*model.PackageUsage{current, queued}
			}(), wantStatus: constants.PackageExpiryEstimateStatusExact,
			wantDate: timePointer(time.Date(2026, 8, 4, 23, 59, 59, 0, location)), wantDays: intPointer(12),
		},
		{
			name: "自然月月末", usages: func() []*model.PackageUsage {
				current := newUsage(1, constants.PackageUsageStatusActive, 1)
				current.ExpiresAt = &currentExpiry
				queued := newUsage(2, constants.PackageUsageStatusPending, 2)
				queued.CalendarTypeSnapshot = constants.PackageCalendarTypeNaturalMonth
				queued.DurationDaysSnapshot = 0
				queued.DurationMonthsSnapshot = 1
				return []*model.PackageUsage{current, queued}
			}(), wantStatus: constants.PackageExpiryEstimateStatusExact,
			wantDate: timePointer(time.Date(2026, 9, 30, 23, 59, 59, 0, location)), wantDays: intPointer(69),
		},
		{
			name: "等待实名激活", usages: func() []*model.PackageUsage {
				u := newUsage(1, constants.PackageUsageStatusPending, 1)
				u.PendingRealnameActivation = true
				return []*model.PackageUsage{u}
			}(), wantStatus: constants.PackageExpiryEstimateStatusWaitingActivation,
		},
		{
			name: "历史空快照回退", usages: func() []*model.PackageUsage {
				current := newUsage(1, constants.PackageUsageStatusActive, 1)
				current.ExpiresAt = &currentExpiry
				queued := newUsage(2, constants.PackageUsageStatusPending, 2)
				queued.ExpiryBaseSnapshot, queued.CalendarTypeSnapshot, queued.DurationDaysSnapshot = "", "", 0
				return []*model.PackageUsage{current, queued}
			}(), packages: map[uint]*model.Package{2: {ExpiryBase: constants.PackageExpiryBaseFromActivation, CalendarType: constants.PackageCalendarTypeByDay, DurationDays: 3}},
			wantStatus: constants.PackageExpiryEstimateStatusExact,
		},
		{
			name: "非法快照", usages: func() []*model.PackageUsage {
				current := newUsage(1, constants.PackageUsageStatusActive, 1)
				current.ExpiresAt = &currentExpiry
				queued := newUsage(2, constants.PackageUsageStatusPending, 2)
				queued.CalendarTypeSnapshot = "bad"
				return []*model.PackageUsage{current, queued}
			}(), wantStatus: constants.PackageExpiryEstimateStatusInvalidData,
		},
		{
			name: "已过期退款软删除加油包均排除", usages: func() []*model.PackageUsage {
				expired := newUsage(1, constants.PackageUsageStatusExpired, 1)
				invalidated := newUsage(2, constants.PackageUsageStatusInvalidated, 2)
				refundID := uint(3)
				refunded := newUsage(3, constants.PackageUsageStatusActive, 3)
				refunded.RefundID = &refundID
				deleted := newUsage(4, constants.PackageUsageStatusActive, 4)
				deleted.DeletedAt = gorm.DeletedAt{Time: now, Valid: true}
				masterID := uint(1)
				addon := newUsage(5, constants.PackageUsageStatusActive, 5)
				addon.MasterUsageID = &masterID
				return []*model.PackageUsage{expired, invalidated, refunded, deleted, addon}
			}(), wantStatus: constants.PackageExpiryEstimateStatusNone,
		},
		{
			name: "多个当前套餐为异常数据", usages: func() []*model.PackageUsage {
				first := newUsage(1, constants.PackageUsageStatusActive, 1)
				first.ExpiresAt = &currentExpiry
				second := newUsage(2, constants.PackageUsageStatusDepleted, 2)
				second.ExpiresAt = &currentExpiry
				return []*model.PackageUsage{first, second}
			}(), wantStatus: constants.PackageExpiryEstimateStatusInvalidData,
		},
		{
			name: "已过期当前套餐返回负数自然日", usages: func() []*model.PackageUsage {
				expiry := time.Date(2026, 7, 20, 23, 59, 59, 0, location)
				u := newUsage(1, constants.PackageUsageStatusActive, 1)
				u.ExpiresAt = &expiry
				return []*model.PackageUsage{u}
			}(), wantStatus: constants.PackageExpiryEstimateStatusExact, wantDays: intPointer(-3),
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			got := Calculate(tt.usages, tt.packages, now)
			if got.ExpiryEstimateStatus != tt.wantStatus {
				t.Fatalf("状态错误：want=%s got=%s", tt.wantStatus, got.ExpiryEstimateStatus)
			}
			if tt.wantDate != nil && (got.EstimatedFinalExpiresAt == nil || !got.EstimatedFinalExpiresAt.Equal(*tt.wantDate)) {
				t.Fatalf("到期时间错误：want=%v got=%v", tt.wantDate, got.EstimatedFinalExpiresAt)
			}
			if tt.wantDays != nil && (got.DaysUntilFinalExpiry == nil || *got.DaysUntilFinalExpiry != *tt.wantDays) {
				t.Fatalf("剩余天数错误：want=%v got=%v", *tt.wantDays, got.DaysUntilFinalExpiry)
			}
			if tt.wantStatus != constants.PackageExpiryEstimateStatusExact && (got.EstimatedFinalExpiresAt != nil || got.DaysUntilFinalExpiry != nil) {
				t.Fatalf("非精确状态必须返回 null：%+v", got)
			}
		})
	}
}

// TestQueryResolveBatchUsesOneBatchLoad 验证一页资产只通过批量读取计算，不逐卡查询套餐。
func TestQueryResolveBatchUsesOneBatchLoad(t *testing.T) {
	tx := testutil.NewPostgresTransaction(t)
	location := time.FixedZone("Asia/Shanghai", 8*60*60)
	now := time.Date(2026, 7, 23, 12, 0, 0, 0, location)
	assetIDs := make([]uint, 0, 100)
	for i := 1; i <= 100; i++ {
		assetID := uint(970000 + i)
		assetIDs = append(assetIDs, assetID)
		expiresAt := now.AddDate(0, 0, i%16)
		usage := &model.PackageUsage{
			OrderID:                assetID,
			OrderNo:                "UR46-BATCH",
			PackageID:              assetID,
			UsageType:              constants.AssetTypeIotCard,
			IotCardID:              assetID,
			DataLimitMB:            1,
			Status:                 constants.PackageUsageStatusActive,
			Priority:               1,
			ActivatedAt:            &now,
			ExpiresAt:              &expiresAt,
			ExpiryBaseSnapshot:     constants.PackageExpiryBaseFromActivation,
			CalendarTypeSnapshot:   constants.PackageCalendarTypeByDay,
			DurationDaysSnapshot:   30,
			DurationMonthsSnapshot: 0,
		}
		if err := tx.Create(usage).Error; err != nil {
			t.Fatalf("创建批量套餐使用记录失败：%v", err)
		}
	}
	query := NewQuery(tx)
	query.now = func() time.Time { return now }
	results, err := query.ResolveBatch(context.Background(), constants.AssetTypeIotCard, assetIDs)
	if err != nil {
		t.Fatalf("批量查询失败：%v", err)
	}
	if len(results) != len(assetIDs) {
		t.Fatalf("批量结果数量错误：want=%d got=%d", len(assetIDs), len(results))
	}
	for _, assetID := range assetIDs {
		if results[assetID].ExpiryEstimateStatus != constants.PackageExpiryEstimateStatusExact {
			t.Fatalf("资产 %d 应得到精确结果：%+v", assetID, results[assetID])
		}
	}
}

// TestQueryIndexesExplainAnalyze 验证开发 PostgreSQL 为两类资产队列查询选择 UR46 部分索引。
func TestQueryIndexesExplainAnalyze(t *testing.T) {
	tx := testutil.NewPostgresTransaction(t)
	queries := []string{
		"EXPLAIN ANALYZE SELECT id FROM tb_package_usage WHERE iot_card_id = 970001 AND master_usage_id IS NULL AND refund_id IS NULL AND status IN (0, 1, 2) ORDER BY priority ASC, created_at ASC, id ASC",
		"EXPLAIN ANALYZE SELECT id FROM tb_package_usage WHERE device_id = 970001 AND master_usage_id IS NULL AND refund_id IS NULL AND status IN (0, 1, 2) ORDER BY priority ASC, created_at ASC, id ASC",
	}
	for _, query := range queries {
		var lines []string
		if err := tx.Raw(query).Scan(&lines).Error; err != nil {
			t.Fatalf("执行 EXPLAIN ANALYZE 失败：%v", err)
		}
		if len(lines) == 0 {
			t.Fatal("EXPLAIN ANALYZE 未返回执行计划")
		}
		t.Logf("%s", lines)
	}
}

func modelBase(id uint, createdAt time.Time) gorm.Model {
	return gorm.Model{ID: id, CreatedAt: createdAt}
}

func intPointer(value int) *int { return &value }

func timePointer(value time.Time) *time.Time { return &value }