package processor

import (
	"context"
	"testing"
	"time"

	"github.com/google/uuid"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"

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

type customerOrderRepoFake struct {
	owner    map[uuid.UUID]uuid.UUID // order -> customer
	orders   []repository.CustomerOrderRow
	items    map[uuid.UUID][]repository.CustomerOrderItemRow
	payments map[uuid.UUID][]repository.CustomerOrderPaymentRow
	offset   int
	limit    int
}

func (f *customerOrderRepoFake) ListOrders(_ context.Context, customerID uuid.UUID, offset, limit int) ([]repository.CustomerOrderRow, int64, error) {
	f.offset, f.limit = offset, limit
	var mine []repository.CustomerOrderRow
	for _, o := range f.orders {
		if f.owner[o.ID] == customerID {
			mine = append(mine, o)
		}
	}
	return mine, int64(len(mine)), nil
}

func (f *customerOrderRepoFake) GetOrder(_ context.Context, customerID, orderID uuid.UUID) (*repository.CustomerOrderRow, error) {
	for _, o := range f.orders {
		if o.ID == orderID && f.owner[o.ID] == customerID {
			c := o
			return &c, nil
		}
	}
	return nil, repository.ErrCustomerOrderNotFound
}

func (f *customerOrderRepoFake) ListItems(_ context.Context, orderID uuid.UUID) ([]repository.CustomerOrderItemRow, error) {
	return f.items[orderID], nil
}

func (f *customerOrderRepoFake) ListPayments(_ context.Context, orderID uuid.UUID) ([]repository.CustomerOrderPaymentRow, error) {
	return f.payments[orderID], nil
}

type earnedFake map[uuid.UUID]OrderEarned

func (f earnedFake) EarnedByOrders(_ context.Context, ids []uuid.UUID) (map[uuid.UUID]OrderEarned, error) {
	out := map[uuid.UUID]OrderEarned{}
	for _, id := range ids {
		if e, ok := f[id]; ok {
			out[id] = e
		}
	}
	return out, nil
}

func newCustomerOrderTest() (*customerOrderRepoFake, uuid.UUID, uuid.UUID, uuid.UUID) {
	customer, other := uuid.New(), uuid.New()
	mine, theirs := uuid.New(), uuid.New()
	repo := &customerOrderRepoFake{
		owner: map[uuid.UUID]uuid.UUID{mine: customer, theirs: other},
		orders: []repository.CustomerOrderRow{
			{ID: mine, OrderNumber: "ORD-1", OutletName: "Gokuna 1", Status: "completed", PaymentStatus: "completed", Subtotal: 90000, TotalAmount: 99000, ItemCount: 2, CreatedAt: time.Now()},
			{ID: theirs, OrderNumber: "ORD-2"},
		},
	}
	return repo, customer, mine, theirs
}

func TestCustomerOrders_ListShowsOnlyTheCustomersOrdersWithEarning(t *testing.T) {
	repo, customer, mine, _ := newCustomerOrderTest()
	p := NewCustomerOrderProcessor(repo, earnedFake{mine: {Points: 900, Coins: 3}})

	got, err := p.List(context.Background(), customer, models.ListCustomerOrdersQuery{Page: 2, Limit: 10})
	require.NoError(t, err)
	require.Len(t, got.Data, 1)
	assert.Equal(t, "ORD-1", got.Data[0].OrderNumber)
	assert.Equal(t, int64(900), got.Data[0].PointsEarned)
	assert.Equal(t, int64(3), got.Data[0].CoinsEarned)
	assert.Equal(t, 10, repo.offset, "page 2 of 10 skips the first 10")
	assert.Equal(t, 10, repo.limit)
	assert.Equal(t, 2, got.Pagination.Page)
}

func TestCustomerOrders_ListDefaultsAndLimits(t *testing.T) {
	repo, customer, _, _ := newCustomerOrderTest()
	p := NewCustomerOrderProcessor(repo, earnedFake{})

	got, err := p.List(context.Background(), customer, models.ListCustomerOrdersQuery{})
	require.NoError(t, err)
	assert.Equal(t, 1, got.Pagination.Page)
	assert.Equal(t, 20, got.Pagination.Limit)

	for _, q := range []models.ListCustomerOrdersQuery{{Page: -1}, {Limit: 101}, {Limit: -5}} {
		_, err := p.List(context.Background(), customer, q)
		assert.ErrorIs(t, err, ErrInvalidWalletQuery, "%+v", q)
	}
}

func TestCustomerOrders_DetailHasItemsPaymentsAndEarning(t *testing.T) {
	repo, customer, mine, _ := newCustomerOrderTest()
	variant, unit := "Large", "ons"
	weight := 4.2
	repo.items = map[uuid.UUID][]repository.CustomerOrderItemRow{
		mine: {
			{ProductName: "Kopi Susu", VariantName: &variant, Quantity: 2, UnitPrice: 25000, TotalPrice: 50000, Status: "completed"},
			{ProductName: "Ikan Tude", Quantity: 1, Weight: &weight, UnitName: &unit, UnitPrice: 4500, TotalPrice: 18900, Status: "completed"},
		},
	}
	repo.payments = map[uuid.UUID][]repository.CustomerOrderPaymentRow{
		mine: {
			{MethodName: "Card", MethodType: "card", Amount: 12500, Status: "completed"},
			{MethodName: "Cash", MethodType: "cash", Amount: 86500, Status: "completed"},
		},
	}
	p := NewCustomerOrderProcessor(repo, earnedFake{mine: {Points: 865}})

	got, err := p.Detail(context.Background(), customer, mine)
	require.NoError(t, err)
	assert.Equal(t, "Gokuna 1", got.OutletName)
	assert.Equal(t, float64(90000), got.Subtotal)
	assert.Equal(t, int64(865), got.PointsEarned)
	require.Len(t, got.Items, 2)
	assert.Equal(t, "Large", *got.Items[0].VariantName)
	assert.Equal(t, []map[string]interface{}{}, got.Items[0].Modifiers, "no modifiers is an empty list, not null")
	assert.Equal(t, 4.2, *got.Items[1].Weight)
	require.Len(t, got.Payments, 2)
	assert.Equal(t, "Card", got.Payments[0].MethodName)
	assert.Equal(t, float64(12500), got.Payments[0].Amount)
}

func TestCustomerOrders_AnotherCustomersOrderIsNotFound(t *testing.T) {
	repo, customer, _, theirs := newCustomerOrderTest()
	_, err := NewCustomerOrderProcessor(repo, earnedFake{}).Detail(context.Background(), customer, theirs)
	assert.ErrorIs(t, err, repository.ErrCustomerOrderNotFound)
}