package common

import (
	"context"
	"testing"
	"time"

	"github.com/perfect-panel/server/internal/model/promo"
	"github.com/perfect-panel/server/internal/svc"
	"gorm.io/gorm"
)

func TestEvaluateInactiveUserExpire(t *testing.T) {
	now := time.Date(2026, 5, 27, 8, 0, 0, 0, time.UTC)
	params := promoRuleParams{InactiveMonths: 3}

	tests := []struct {
		name       string
		lastExpire time.Time
		want       bool
	}{
		{
			name:       "permanent subscription is not inactive",
			lastExpire: time.UnixMilli(0),
			want:       false,
		},
		{
			name:       "active subscription is not inactive",
			lastExpire: now.Add(time.Hour),
			want:       false,
		},
		{
			name:       "expire at threshold is inactive",
			lastExpire: now.AddDate(0, -3, 0),
			want:       true,
		},
		{
			name:       "expire before threshold is inactive",
			lastExpire: now.AddDate(0, -3, -1),
			want:       true,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if got := evaluateInactiveUserExpire(tt.lastExpire, params, now); got != tt.want {
				t.Fatalf("evaluateInactiveUserExpire() = %v, want %v", got, tt.want)
			}
		})
	}
}

func TestEvaluatePromoAllowsAnonymousCampaign(t *testing.T) {
	end := time.Now().Add(time.Hour)
	model := &fakePromoModel{rules: []*promo.RuleWithPrice{
		{
			Rule: promo.Rule{
				Id:      3,
				Name:    "campaign",
				Type:    promo.RuleTypeCampaign,
				Enabled: true,
				EndTime: &end,
			},
			PromoPrice: 199,
		},
	}}

	got, err := EvaluatePromo(context.Background(), &svc.ServiceContext{DB: &gorm.DB{}, PromoModel: model}, 0, 7, 12)
	if err != nil {
		t.Fatalf("EvaluatePromo returned error: %v", err)
	}
	if !got.Eligible {
		t.Fatal("anonymous campaign promo should be eligible")
	}
	if got.RuleID != 3 {
		t.Fatalf("RuleID = %d, want 3", got.RuleID)
	}
	if got.PromoPrice != 199 {
		t.Fatalf("PromoPrice = %d, want 199", got.PromoPrice)
	}
	if model.lastSubscribeID != 7 {
		t.Fatalf("lastSubscribeID = %d, want 7", model.lastSubscribeID)
	}
	if model.lastQuantity != 12 {
		t.Fatalf("lastQuantity = %d, want 12", model.lastQuantity)
	}
}

type fakePromoModel struct {
	rules           []*promo.RuleWithPrice
	lastSubscribeID int64
	lastQuantity    int64
}

func (m *fakePromoModel) QueryEligibleRules(_ context.Context, subscribeID int64, quantity int64) ([]*promo.RuleWithPrice, error) {
	m.lastSubscribeID = subscribeID
	m.lastQuantity = quantity
	return m.rules, nil
}

func (m *fakePromoModel) InsertUsage(context.Context, *promo.Usage, ...*gorm.DB) error {
	return nil
}

func (m *fakePromoModel) InsertRule(context.Context, *promo.Rule) error {
	return nil
}

func (m *fakePromoModel) FindRule(context.Context, int64) (*promo.Rule, error) {
	return nil, gorm.ErrRecordNotFound
}

func (m *fakePromoModel) UpdateRule(context.Context, *promo.Rule) error {
	return nil
}

func (m *fakePromoModel) DeleteRule(context.Context, int64) error {
	return nil
}

func (m *fakePromoModel) QueryRuleList(context.Context, int, int, string, *bool, string) (int64, []*promo.Rule, error) {
	return 0, nil, nil
}

func (m *fakePromoModel) UpsertPrices(context.Context, int64, []*promo.SubscribePromo) error {
	return nil
}

func (m *fakePromoModel) FindPrice(context.Context, int64) (*promo.SubscribePromo, error) {
	return nil, gorm.ErrRecordNotFound
}

func (m *fakePromoModel) DeletePrice(context.Context, int64) error {
	return nil
}

func (m *fakePromoModel) QueryPriceList(context.Context, promo.PriceFilter) (int64, []*promo.SubscribePromo, error) {
	return 0, nil, nil
}

func (m *fakePromoModel) QueryUsageList(context.Context, promo.UsageFilter) (int64, []*promo.Usage, error) {
	return 0, nil, nil
}

func (m *fakePromoModel) Transaction(context.Context, func(*gorm.DB) error) error {
	return nil
}