package processor

import (
	"context"
	"os"
	"testing"
	"time"

	"github.com/google/uuid"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
	"gorm.io/driver/postgres"
	"gorm.io/gorm"
	"gorm.io/gorm/logger"

	"apskel-pos-be/internal/constants"
	"apskel-pos-be/internal/models"
	"apskel-pos-be/internal/repository"
)

// fixedOrganizationSettings serves the same organization settings to every caller.
type fixedOrganizationSettings struct{ s models.OrganizationLoyaltySettings }

func (f fixedOrganizationSettings) Organization(context.Context, uuid.UUID) (*models.OrganizationLoyaltySettings, error) {
	s := f.s
	return &s, nil
}

// walletMoveDB opens TEST_DATABASE_URL and creates an organization with two customers,
// removed again when the test ends. See internal/repository/wallet_repository_test.go.
func walletMoveDB(t *testing.T) (db *gorm.DB, org, a, b uuid.UUID) {
	t.Helper()
	dsn := os.Getenv("TEST_DATABASE_URL")
	if dsn == "" {
		t.Skip("TEST_DATABASE_URL not set")
	}
	db, err := gorm.Open(postgres.Open(dsn), &gorm.Config{Logger: logger.Default.LogMode(logger.Silent)})
	require.NoError(t, err)

	org, a, b = uuid.New(), uuid.New(), uuid.New()
	phoneA, phoneB := "08"+a.String()[:10], "08"+b.String()[:10]
	require.NoError(t, db.Exec(`INSERT INTO organizations (id, name, plan_type) VALUES (?, 'wallet move test', 'basic')`, org).Error)
	require.NoError(t, db.Exec(`INSERT INTO customers (id, organization_id, name, phone_number) VALUES (?, ?, 'Anita', ?), (?, ?, 'Budi Santoso', ?)`,
		a, org, phoneA, b, org, phoneB).Error)
	customers := []uuid.UUID{a, b}
	t.Cleanup(func() {
		db.Exec(`DELETE FROM wallet_lot_allocations WHERE lot_id IN (SELECT id FROM wallet_lots WHERE customer_id IN ?)`, customers)
		db.Exec(`DELETE FROM wallet_lots WHERE customer_id IN ? AND origin_lot_id IS NOT NULL`, customers)
		db.Exec(`DELETE FROM wallet_lots WHERE customer_id IN ?`, customers)
		db.Exec(`DELETE FROM wallet_transactions WHERE customer_id IN ?`, customers)
		db.Exec(`DELETE FROM customer_wallets WHERE customer_id IN ?`, customers)
		db.Exec(`DELETE FROM customers WHERE id IN ?`, customers)
		db.Exec(`DELETE FROM organizations WHERE id = ?`, org)
	})
	return db, org, a, b
}

func TestWalletExchange_AgainstPostgres(t *testing.T) {
	db, _, a, _ := walletMoveDB(t)
	wallet := NewWalletProcessor(repository.NewWalletRepository(db))
	txm := repository.NewTxManager(db)
	settings := fixedOrganizationSettings{models.OrganizationLoyaltySettings{
		Exchange: models.LoyaltyExchangeSettings{CoinAmount: 10, PointAmount: 3},
	}}
	p := NewWalletExchangeProcessor(repository.NewWalletMoveRepository(db), settings, repository.NewWalletQueryRepository(db),
		&movePinFake{good: "482913"}, wallet, txm)

	expiry := time.Now().Add(24 * time.Hour).Truncate(time.Second)
	require.NoError(t, txm.WithTransaction(context.Background(), func(ctx context.Context) error {
		in := earn(a, 30, &expiry)
		in.Currency = constants.WalletCurrencyCoin
		_, err := wallet.Credit(ctx, in)
		return err
	}))

	res, err := p.Exchange(context.Background(), a, 20, "482913", "db-key", models.CustomerPinRequestInfo{})
	require.NoError(t, err)
	assert.Equal(t, int64(6), res.Points)
	assert.Equal(t, int64(10), res.CoinBalance)
	assert.Equal(t, int64(6), res.PointBalance)
	require.Len(t, res.Lots, 1)
	require.NotNil(t, res.Lots[0].ExpiresAt)
	assert.True(t, res.Lots[0].ExpiresAt.Equal(expiry))

	// The retry reads the frozen rate back out of JSONB and replays.
	again, err := p.Exchange(context.Background(), a, 20, "482913", "db-key", models.CustomerPinRequestInfo{})
	require.NoError(t, err)
	assert.True(t, again.Replayed)
	assert.Equal(t, int64(6), again.Points)

	var rows int64
	require.NoError(t, db.Raw(`SELECT COUNT(*) FROM wallet_transactions WHERE group_id = ?`, res.GroupID).Scan(&rows).Error)
	assert.Equal(t, int64(2), rows)
}