//go:build test

package user

import (
	"context"
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"

	"crussell/db"
	"crussell/testutils"
	"crussell/testutils/fixtures"

	"github.com/go-chi/chi/v5"
	"github.com/stretchr/testify/assert"
)

func TestCustomerRelationship_Success(t *testing.T) {
	t.Parallel()
	ctx, tx := testutils.SetupTestTx(t)

	userID, err := fixtures.CreateTestUser(tx)
	if err != nil {
		t.Fatalf("failed to create test user: %v", err)
	}

	svc1, err := fixtures.CreateTestService(tx)
	if err != nil {
		t.Fatalf("failed to create service 1: %v", err)
	}
	svc2ID, err := createService(ctx, tx, "Gel Manicure", 35.00)
	if err != nil {
		t.Fatalf("failed to create service 2: %v", err)
	}

	booking1 := createCompletedBooking(t, ctx, tx, userID, svc1, "2024-01-15 10:00:00+00", 50.00)
	booking2 := createCompletedBooking(t, ctx, tx, userID, svc1, "2024-06-20 14:00:00+00", 50.00)
	booking3 := createCompletedBooking(t, ctx, tx, userID, svc2ID, "2024-12-01 11:00:00+00", 35.00)

	createPayment(t, ctx, tx, booking1, "full", 50.00)
	createPayment(t, ctx, tx, booking2, "full", 50.00)
	createPayment(t, ctx, tx, booking3, "full", 35.00)

	req := newAdminRequest("GET", "/api/admin/users/"+userID+"/relationship", userID, ctx)
	rr := httptest.NewRecorder()
	GetCustomerRelationshipHandler(rr, req)

	if rr.Code != http.StatusOK {
		t.Fatalf("expected status 200, got %d. body: %s", rr.Code, rr.Body.String())
	}

	var result CustomerRelationship
	if err := json.Unmarshal(rr.Body.Bytes(), &result); err != nil {
		t.Fatalf("failed to unmarshal response: %v", err)
	}

	if result.TotalSpend != 135.00 {
		t.Errorf("expected total spend 135.00, got %.2f", result.TotalSpend)
	}

	if result.TotalTips != 0 {
		t.Errorf("expected total tips 0, got %.2f", result.TotalTips)
	}

	if result.TotalVisits != 3 {
		t.Errorf("expected total visits 3, got %d", result.TotalVisits)
	}

	if result.CustomerFor == "" {
		t.Error("expected customerFor to be set")
	}

	if result.FirstVisitDate == nil {
		t.Fatal("expected firstVisitDate to be set")
	}
	if !strings.Contains(*result.FirstVisitDate, "2024-01-15") {
		t.Errorf("expected first visit date to contain 2024-01-15, got %s", *result.FirstVisitDate)
	}

	if result.LastVisitDate == nil {
		t.Fatal("expected lastVisitDate to be set")
	}
	if !strings.Contains(*result.LastVisitDate, "2024-12-01") {
		t.Errorf("expected last visit date to contain 2024-12-01, got %s", *result.LastVisitDate)
	}

	if len(result.TopServices) != 2 {
		t.Fatalf("expected 2 top services, got %d", len(result.TopServices))
	}
	if result.TopServices[0].Count != 2 {
		t.Errorf("expected top service count 2, got %d", result.TopServices[0].Count)
	}
	if result.TopServices[1].Count != 1 {
		t.Errorf("expected second service count 1, got %d", result.TopServices[1].Count)
	}
}

func TestCustomerRelationship_NoBookings(t *testing.T) {
	t.Parallel()
	ctx, tx := testutils.SetupTestTx(t)

	userID, err := fixtures.CreateTestUser(tx)
	if err != nil {
		t.Fatalf("failed to create test user: %v", err)
	}

	req := newAdminRequest("GET", "/api/admin/users/"+userID+"/relationship", userID, ctx)
	rr := httptest.NewRecorder()
	GetCustomerRelationshipHandler(rr, req)

	if rr.Code != http.StatusOK {
		t.Fatalf("expected status 200, got %d. body: %s", rr.Code, rr.Body.String())
	}

	var result CustomerRelationship
	if err := json.Unmarshal(rr.Body.Bytes(), &result); err != nil {
		t.Fatalf("failed to unmarshal response: %v", err)
	}

	if result.TotalSpend != 0 {
		t.Errorf("expected total spend 0, got %.2f", result.TotalSpend)
	}
	if result.TotalTips != 0 {
		t.Errorf("expected total tips 0, got %.2f", result.TotalTips)
	}
	if result.TotalVisits != 0 {
		t.Errorf("expected total visits 0, got %d", result.TotalVisits)
	}
	if result.CustomerFor != "" {
		t.Errorf("expected empty customerFor, got %s", result.CustomerFor)
	}
	if result.FirstVisitDate != nil {
		t.Errorf("expected firstVisitDate to be nil, got %s", *result.FirstVisitDate)
	}
	if result.LastVisitDate != nil {
		t.Errorf("expected lastVisitDate to be nil, got %s", *result.LastVisitDate)
	}
	if len(result.TopServices) != 0 {
		t.Errorf("expected empty top services, got %d items", len(result.TopServices))
	}
}

func TestCustomerRelationship_UserNotFound(t *testing.T) {
	t.Parallel()

	req := newAdminRequest("GET", "/api/admin/users/000000000000/relationship", "000000000000", context.Background())
	rr := httptest.NewRecorder()
	GetCustomerRelationshipHandler(rr, req)

	if rr.Code != http.StatusNotFound {
		t.Errorf("expected status 404, got %d", rr.Code)
	}
}

func TestCustomerRelationship_InvalidID(t *testing.T) {
	t.Parallel()

	tests := []struct {
		name string
		id   string
	}{
		{"too_short", "abc"},
		{"too_long", "abcdef1234567"},
		{"empty", ""},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			req := newAdminRequest("GET", "/api/admin/users/"+tt.id+"/relationship", tt.id, context.Background())
			rr := httptest.NewRecorder()
			GetCustomerRelationshipHandler(rr, req)

			if rr.Code != http.StatusNotFound {
				t.Errorf("expected status 404 for id %q, got %d", tt.id, rr.Code)
			}
		})
	}
}

func TestCustomerRelationship_OnlyPendingBookings(t *testing.T) {
	t.Parallel()
	ctx, tx := testutils.SetupTestTx(t)

	userID, err := fixtures.CreateTestUser(tx)
	if err != nil {
		t.Fatalf("failed to create test user: %v", err)
	}

	svcID, err := fixtures.CreateTestService(tx)
	if err != nil {
		t.Fatalf("failed to create service: %v", err)
	}

	bookingID, err := fixtures.CreateTestBooking(tx, userID, svcID)
	if err != nil {
		t.Fatalf("failed to create booking: %v", err)
	}
	_ = bookingID

	req := newAdminRequest("GET", "/api/admin/users/"+userID+"/relationship", userID, ctx)
	rr := httptest.NewRecorder()
	GetCustomerRelationshipHandler(rr, req)

	if rr.Code != http.StatusOK {
		t.Fatalf("expected status 200, got %d. body: %s", rr.Code, rr.Body.String())
	}

	var result CustomerRelationship
	if err := json.Unmarshal(rr.Body.Bytes(), &result); err != nil {
		t.Fatalf("failed to unmarshal response: %v", err)
	}

	if result.TotalVisits != 0 {
		t.Errorf("expected 0 visits (pending booking), got %d", result.TotalVisits)
	}
	if result.TotalSpend != 0 {
		t.Errorf("expected 0 spend (no completed payments), got %.2f", result.TotalSpend)
	}
	if result.TotalTips != 0 {
		t.Errorf("expected 0 tips, got %.2f", result.TotalTips)
	}
}

func TestCustomerRelationship_PartialPayments(t *testing.T) {
	t.Parallel()
	ctx, tx := testutils.SetupTestTx(t)

	userID, err := fixtures.CreateTestUser(tx)
	if err != nil {
		t.Fatalf("failed to create test user: %v", err)
	}

	svcID, err := createService(ctx, tx, "Test Service", 100.00)
	if err != nil {
		t.Fatalf("failed to create service: %v", err)
	}

	bookingID := createCompletedBooking(t, ctx, tx, userID, svcID, "2024-03-01 10:00:00+00", 100.00)

	createPayment(t, ctx, tx, bookingID, "full", 80.00)
	createPayment(t, ctx, tx, bookingID, "tip", 10.00)
	createPayment(t, ctx, tx, bookingID, "deposit", 20.00)

	req := newAdminRequest("GET", "/api/admin/users/"+userID+"/relationship", userID, ctx)
	rr := httptest.NewRecorder()
	GetCustomerRelationshipHandler(rr, req)

	if rr.Code != http.StatusOK {
		t.Fatalf("expected status 200, got %d. body: %s", rr.Code, rr.Body.String())
	}

	var result CustomerRelationship
	if err := json.Unmarshal(rr.Body.Bytes(), &result); err != nil {
		t.Fatalf("failed to unmarshal response: %v", err)
	}

	if result.TotalSpend != 100.00 {
		t.Errorf("expected total spend 100.00 (full + deposit), got %.2f", result.TotalSpend)
	}

	if result.TotalTips != 10.00 {
		t.Errorf("expected total tips 10.00, got %.2f", result.TotalTips)
	}
}

func newAdminRequest(method, path, userID string, ctx context.Context) *http.Request {
	req := httptest.NewRequest(method, path, nil)

	rctx := chi.NewRouteContext()
	rctx.URLParams.Add("id", userID)

	chiCtx := context.WithValue(ctx, chi.RouteCtxKey, rctx)
	return req.WithContext(chiCtx)
}

func createService(ctx context.Context, q db.Querier, name string, price float64) (string, error) {
	var id string
	err := q.QueryRow(ctx, `
		INSERT INTO services (name, description, price, duration_minutes, is_active, minimum_age_required)
		VALUES ($1, $2, $3, $4, $5, $6)
		RETURNING id
	`, name, "Test service", price, 60, true, 16).Scan(&id)
	return id, err
}

func createCompletedBooking(t *testing.T, ctx context.Context, q db.Querier, userID, serviceID, startTime string, price float64) string {
	t.Helper()
	var bookingID string
	err := q.QueryRow(ctx, `
		INSERT INTO bookings (user_id, start_time, status)
		VALUES ($1, $2, 'completed')
		RETURNING id
	`, userID, startTime).Scan(&bookingID)
	if err != nil {
		t.Fatalf("failed to create completed booking: %v", err)
	}

	_, err = q.Exec(ctx, `
		INSERT INTO booking_services (booking_id, service_id, override_price)
		VALUES ($1, $2, $3)
	`, bookingID, serviceID, price)
	if err != nil {
		t.Fatalf("failed to link service to booking: %v", err)
	}

	return bookingID
}

func createPayment(t *testing.T, ctx context.Context, q db.Querier, bookingID, paymentType string, amount float64) {
	t.Helper()
	_, err := q.Exec(ctx, `
		INSERT INTO payments (booking_id, payment_type, payment_method, amount, status)
		VALUES ($1, $2, 'in_person_card', $3, 'completed')
	`, bookingID, paymentType, amount)
	if err != nil {
		t.Fatalf("failed to create payment: %v", err)
	}
}

func TestFormatPlural(t *testing.T) {
	assert.Equal(t, "1 day", formatPlural(1, "day"))
	assert.Equal(t, "2 days", formatPlural(2, "day"))
	assert.Equal(t, "0 days", formatPlural(0, "day"))
}