package catalog

import (
	"context"
	"errors"
	"testing"

	"bookra/apps/backend/internal/db"
	"bookra/apps/backend/internal/domain"
)

var owner = domain.Principal{Subject: "demo-owner", Email: "demo@bookra.dev", Role: "owner"}

type stubBilling struct {
	entitlements domain.PlanEntitlements
}

func (s stubBilling) GetEntitlements(_ context.Context, _ string) (domain.PlanEntitlements, error) {
	return s.entitlements, nil
}

func newCatalogService(repo db.Repository) *Service {
	return NewService(repo, stubBilling{entitlements: domain.PlanEntitlements{MaxStaff: -1}}, nil)
}

func TestListServicesReturnsSeededService(t *testing.T) {
	repo := db.NewMemoryRepository()
	svc := newCatalogService(repo)

	services, err := svc.ListServices(context.Background(), owner)
	if err != nil {
		t.Fatalf("list services: %v", err)
	}
	if len(services) != 1 {
		t.Fatalf("expected 1 seeded service, got %d", len(services))
	}
	if services[0].Name != "Signature treatment" {
		t.Fatalf("unexpected service name %q", services[0].Name)
	}
}

func TestServiceCRUDLifecycle(t *testing.T) {
	repo := db.NewMemoryRepository()
	svc := newCatalogService(repo)
	ctx := context.Background()

	created, err := svc.CreateService(ctx, owner, domain.CreateServiceRequest{
		Name:                "  Haircut  ",
		DurationMinutes:     45,
		BufferBeforeMinutes: 5,
		BufferAfterMinutes:  10,
		PriceCents:          90000,
	})
	if err != nil {
		t.Fatalf("create service: %v", err)
	}
	if created.Name != "Haircut" {
		t.Fatalf("expected trimmed name, got %q", created.Name)
	}
	if created.TenantID == "" {
		t.Fatal("expected tenant id on created service")
	}

	services, err := svc.ListServices(ctx, owner)
	if err != nil {
		t.Fatalf("list services: %v", err)
	}
	if len(services) != 2 {
		t.Fatalf("expected 2 services, got %d", len(services))
	}

	zero := 0
	if _, err := svc.UpdateService(ctx, owner, created.ID, domain.UpdateServiceRequest{DurationMinutes: &zero}); !errors.Is(err, ErrInvalidInput) {
		t.Fatalf("expected ErrInvalidInput for zero duration, got %v", err)
	}

	name := "Deluxe haircut"
	price := 110000
	updated, err := svc.UpdateService(ctx, owner, created.ID, domain.UpdateServiceRequest{Name: &name, PriceCents: &price})
	if err != nil {
		t.Fatalf("update service: %v", err)
	}
	if updated.Name != "Deluxe haircut" || updated.PriceCents != 110000 {
		t.Fatalf("unexpected update result %+v", updated)
	}
	if updated.DurationMinutes != 45 || updated.BufferAfterMinutes != 10 {
		t.Fatalf("partial update clobbered untouched fields %+v", updated)
	}

	if err := svc.DeleteService(ctx, owner, created.ID); err != nil {
		t.Fatalf("delete service: %v", err)
	}
	services, err = svc.ListServices(ctx, owner)
	if err != nil {
		t.Fatalf("list services: %v", err)
	}
	if len(services) != 1 {
		t.Fatalf("expected 1 service after delete, got %d", len(services))
	}
}

func TestServiceValidation(t *testing.T) {
	repo := db.NewMemoryRepository()
	svc := newCatalogService(repo)
	ctx := context.Background()

	cases := []struct {
		name string
		req  domain.CreateServiceRequest
	}{
		{"empty name", domain.CreateServiceRequest{Name: "   ", DurationMinutes: 30}},
		{"zero duration", domain.CreateServiceRequest{Name: "Cut", DurationMinutes: 0}},
		{"huge duration", domain.CreateServiceRequest{Name: "Cut", DurationMinutes: 2000}},
		{"negative buffer", domain.CreateServiceRequest{Name: "Cut", DurationMinutes: 30, BufferBeforeMinutes: -1}},
		{"negative price", domain.CreateServiceRequest{Name: "Cut", DurationMinutes: 30, PriceCents: -5}},
	}
	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			if _, err := svc.CreateService(ctx, owner, tc.req); !errors.Is(err, ErrInvalidInput) {
				t.Fatalf("expected ErrInvalidInput, got %v", err)
			}
		})
	}
}

func TestServiceNotFoundAndMembership(t *testing.T) {
	repo := db.NewMemoryRepository()
	svc := newCatalogService(repo)
	ctx := context.Background()

	missingID := "00000000-0000-0000-0000-000000000001"
	if _, err := svc.UpdateService(ctx, owner, missingID, domain.UpdateServiceRequest{}); !errors.Is(err, ErrServiceNotFound) {
		t.Fatalf("expected ErrServiceNotFound, got %v", err)
	}
	if err := svc.DeleteService(ctx, owner, missingID); !errors.Is(err, ErrServiceNotFound) {
		t.Fatalf("expected ErrServiceNotFound, got %v", err)
	}

	stranger := domain.Principal{Subject: "someone-else", Role: "owner"}
	if _, err := svc.ListServices(ctx, stranger); !errors.Is(err, ErrTenantMembership) {
		t.Fatalf("expected ErrTenantMembership, got %v", err)
	}
	if _, err := svc.CreateService(ctx, stranger, domain.CreateServiceRequest{Name: "Cut", DurationMinutes: 30}); !errors.Is(err, ErrTenantMembership) {
		t.Fatalf("expected ErrTenantMembership, got %v", err)
	}
}

func TestStaffCRUDLifecycle(t *testing.T) {
	repo := db.NewMemoryRepository()
	svc := newCatalogService(repo)
	ctx := context.Background()

	locations, err := svc.ListLocations(ctx, owner)
	if err != nil || len(locations) == 0 {
		t.Fatalf("expected seeded location, got %v err=%v", locations, err)
	}
	locationID := locations[0].ID

	created, err := svc.CreateStaff(ctx, owner, domain.CreateStaffRequest{
		DisplayName: "  Anna Novak  ",
		LocationID:  &locationID,
	})
	if err != nil {
		t.Fatalf("create staff: %v", err)
	}
	if created.DisplayName != "Anna Novak" {
		t.Fatalf("expected trimmed name, got %q", created.DisplayName)
	}
	if !created.Active {
		t.Fatal("new staff member should default to active")
	}
	if created.LocationID == nil || *created.LocationID != locationID {
		t.Fatalf("expected location assignment %s, got %+v", locationID, created.LocationID)
	}

	staff, err := svc.ListStaff(ctx, owner)
	if err != nil {
		t.Fatalf("list staff: %v", err)
	}
	if len(staff) != 2 {
		t.Fatalf("expected seeded member + new member, got %d", len(staff))
	}

	inactive := false
	cleared := ""
	updated, err := svc.UpdateStaff(ctx, owner, created.ID, domain.UpdateStaffRequest{
		Active:     &inactive,
		LocationID: &cleared,
	})
	if err != nil {
		t.Fatalf("update staff: %v", err)
	}
	if updated.Active {
		t.Fatal("expected staff member to be deactivated")
	}
	if updated.LocationID != nil {
		t.Fatalf("expected cleared location, got %+v", updated.LocationID)
	}
	if updated.DisplayName != "Anna Novak" {
		t.Fatalf("name should be untouched, got %q", updated.DisplayName)
	}

	if err := svc.DeleteStaff(ctx, owner, created.ID); err != nil {
		t.Fatalf("delete staff: %v", err)
	}
	staff, err = svc.ListStaff(ctx, owner)
	if err != nil {
		t.Fatalf("list staff: %v", err)
	}
	if len(staff) != 1 {
		t.Fatalf("expected 1 staff member after delete, got %d", len(staff))
	}
}

func TestCreateStaffEnforcesPlanLimit(t *testing.T) {
	repo := db.NewMemoryRepository()
	// Demo tenant seeds one member; a limit of 1 must reject a second.
	svc := NewService(repo, stubBilling{entitlements: domain.PlanEntitlements{MaxStaff: 1}}, nil)

	_, err := svc.CreateStaff(context.Background(), owner, domain.CreateStaffRequest{DisplayName: "Second"})
	if !errors.Is(err, ErrPlanLimitReached) {
		t.Fatalf("expected ErrPlanLimitReached, got %v", err)
	}
}

func TestCreateStaffRejectsForeignLocation(t *testing.T) {
	repo := db.NewMemoryRepository()
	svc := newCatalogService(repo)

	foreign := "00000000-0000-0000-0000-000000000099"
	_, err := svc.CreateStaff(context.Background(), owner, domain.CreateStaffRequest{
		DisplayName: "Anna",
		LocationID:  &foreign,
	})
	if !errors.Is(err, ErrInvalidInput) {
		t.Fatalf("expected ErrInvalidInput, got %v", err)
	}
}

func TestStaffNotFoundAndValidation(t *testing.T) {
	repo := db.NewMemoryRepository()
	svc := newCatalogService(repo)
	ctx := context.Background()

	if _, err := svc.CreateStaff(ctx, owner, domain.CreateStaffRequest{DisplayName: "  "}); !errors.Is(err, ErrInvalidInput) {
		t.Fatalf("expected ErrInvalidInput for blank name, got %v", err)
	}

	missingID := "00000000-0000-0000-0000-000000000001"
	if _, err := svc.UpdateStaff(ctx, owner, missingID, domain.UpdateStaffRequest{}); !errors.Is(err, ErrStaffNotFound) {
		t.Fatalf("expected ErrStaffNotFound, got %v", err)
	}
	if err := svc.DeleteStaff(ctx, owner, missingID); !errors.Is(err, ErrStaffNotFound) {
		t.Fatalf("expected ErrStaffNotFound, got %v", err)
	}

	stranger := domain.Principal{Subject: "someone-else", Role: "staff"}
	if _, err := svc.ListStaff(ctx, stranger); !errors.Is(err, ErrTenantMembership) {
		t.Fatalf("expected ErrTenantMembership, got %v", err)
	}
}