package checkout

import (
	"testing"

	checkout_messages "git.k6n.net/go-cart-actor/proto/checkout"
)

func TestHandleContactDetailsUpdated(t *testing.T) {
	tests := []struct {
		name     string
		initial  *ContactDetails
		update   *checkout_messages.ContactDetailsUpdated
		expected *ContactDetails
	}{
		{
			name:    "update all fields",
			initial: nil,
			update: &checkout_messages.ContactDetailsUpdated{
				Email: stringPtr("test@example.com"),
				Phone: stringPtr("123456789"),
				Name:  stringPtr("John Doe"),
			},
			expected: &ContactDetails{
				Email: stringPtr("test@example.com"),
				Phone: stringPtr("123456789"),
				Name:  stringPtr("John Doe"),
			},
		},
		{
			name: "update partial fields",
			initial: &ContactDetails{
				Email: stringPtr("old@example.com"),
				Phone: nil,
				Name:  stringPtr("Old Name"),
			},
			update: &checkout_messages.ContactDetailsUpdated{
				Phone: stringPtr("987654321"),
			},
			expected: &ContactDetails{
				Email: stringPtr("old@example.com"),
				Phone: stringPtr("987654321"),
				Name:  stringPtr("Old Name"),
			},
		},
		{
			name:     "nil message",
			initial:  nil,
			update:   nil,
			expected: &ContactDetails{}, // but error expected
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			grain := &CheckoutGrain{
				ContactDetails: tt.initial,
			}

			err := HandleContactDetailsUpdated(grain, tt.update)

			if tt.name == "nil message" {
				if err == nil {
					t.Errorf("expected error for nil message, got nil")
				}
				return
			}

			if err != nil {
				t.Errorf("unexpected error: %v", err)
			}

			if grain.ContactDetails == nil && tt.expected != nil {
				t.Errorf("expected contact details, got nil")
			} else if grain.ContactDetails != nil && tt.expected == nil {
				t.Errorf("expected nil contact details, got %v", grain.ContactDetails)
			} else if grain.ContactDetails != nil && tt.expected != nil {
				if (grain.ContactDetails.Email == nil && tt.expected.Email != nil) || (grain.ContactDetails.Email != nil && tt.expected.Email == nil) || (grain.ContactDetails.Email != nil && *grain.ContactDetails.Email != *tt.expected.Email) {
					t.Errorf("email mismatch: got %v, expected %v", grain.ContactDetails.Email, tt.expected.Email)
				}
				if (grain.ContactDetails.Phone == nil && tt.expected.Phone != nil) || (grain.ContactDetails.Phone != nil && tt.expected.Phone == nil) || (grain.ContactDetails.Phone != nil && *grain.ContactDetails.Phone != *tt.expected.Phone) {
					t.Errorf("phone mismatch: got %v, expected %v", grain.ContactDetails.Phone, tt.expected.Phone)
				}
				if (grain.ContactDetails.Name == nil && tt.expected.Name != nil) || (grain.ContactDetails.Name != nil && tt.expected.Name == nil) || (grain.ContactDetails.Name != nil && *grain.ContactDetails.Name != *tt.expected.Name) {
					t.Errorf("name mismatch: got %v, expected %v", grain.ContactDetails.Name, tt.expected.Name)
				}
			}
		})
	}
}

func stringPtr(s string) *string {
	return &s
}