package codes_test

import (
	"context"
	"testing"
	"time"

	"github.com/wangjia/pangolin/server/internal/codes"
)

// 新用户:GrantPaidSubscriptionTx 新建一行 source='pay',到期 = now+days。
func TestGrantPaidSubscription_NewRow(t *testing.T) {
	db := openMigratedSQLite(t)
	seedUser(t, db, 1)
	store := codes.NewStore(db)
	svc := codes.NewService(store, nil, 5, time.Hour)
	ctx := context.Background()

	tx, err := store.BeginTx(ctx)
	if err != nil {
		t.Fatalf("BeginTx: %v", err)
	}
	subID, expiresAt, err := svc.GrantPaidSubscriptionTx(ctx, tx, 1, codes.PlanPro, 31, "order:test001")
	if err != nil {
		t.Fatalf("GrantPaidSubscriptionTx: %v", err)
	}
	if err := tx.Commit(); err != nil {
		t.Fatalf("commit: %v", err)
	}
	if subID == 0 {
		t.Fatal("subID = 0")
	}
	want := time.Now().UTC().AddDate(0, 0, 31)
	if d := expiresAt.Sub(want); d > time.Minute || d < -time.Minute {
		t.Errorf("expiresAt = %v, want ≈ %v", expiresAt, want)
	}
	var source string
	if err := db.QueryRow(`SELECT source FROM subscriptions WHERE id = ?`, subID).Scan(&source); err != nil {
		t.Fatalf("query source: %v", err)
	}
	if source != "pay" {
		t.Errorf("source = %q, want pay", source)
	}
}

// 已有同 plan 活跃订阅:原地延长(行数不变,expires 累加),复用兑换码同一段叠加语义。
func TestGrantPaidSubscription_StacksOnActive(t *testing.T) {
	db := openMigratedSQLite(t)
	seedUser(t, db, 1)
	store := codes.NewStore(db)
	svc := codes.NewService(store, nil, 5, time.Hour)
	ctx := context.Background()

	grant := func(days int) time.Time {
		tx, err := store.BeginTx(ctx)
		if err != nil {
			t.Fatalf("BeginTx: %v", err)
		}
		_, exp, err := svc.GrantPaidSubscriptionTx(ctx, tx, 1, codes.PlanPro, days, "order:test002")
		if err != nil {
			t.Fatalf("grant: %v", err)
		}
		if err := tx.Commit(); err != nil {
			t.Fatalf("commit: %v", err)
		}
		return exp
	}
	first := grant(31)
	second := grant(92)

	want := first.AddDate(0, 0, 92)
	if d := second.Sub(want); d > time.Minute || d < -time.Minute {
		t.Errorf("stacked expiresAt = %v, want ≈ %v", second, want)
	}
	var n int
	if err := db.QueryRow(`SELECT COUNT(*) FROM subscriptions WHERE user_id = 1`).Scan(&n); err != nil {
		t.Fatalf("count: %v", err)
	}
	if n != 1 {
		t.Errorf("subscription rows = %d, want 1(原地延长)", n)
	}
}