package tests

// integration_http_test.go contains backend tests for package behavior, error paths, and regressions.

import (
	"bytes"
	"context"
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"strconv"
	"testing"
	"time"

	"github.com/gofiber/fiber/v3"
	"github.com/gofiber/fiber/v3/middleware/adaptor"
	"github.com/prometheus/client_golang/prometheus"

	appu "knowfoolery/backend/services/user-service/internal/application/user"
	domain "knowfoolery/backend/services/user-service/internal/domain/user"
	httpapi "knowfoolery/backend/services/user-service/internal/interfaces/http"
	sharederrors "knowfoolery/backend/shared/domain/errors"
	sharedtypes "knowfoolery/backend/shared/domain/types"
	sharedmetrics "knowfoolery/backend/shared/infra/observability/metrics"
	"knowfoolery/backend/shared/infra/utils/validation"
	sharedhttpx "knowfoolery/backend/shared/testutil/httpx"
)

// inMemoryRepo is a lightweight repository double for HTTP integration tests.
type inMemoryRepo struct {
	items map[string]*domain.User
	audit []domain.AuditLogEntry
}

// newInMemoryRepo creates in-memory test doubles and deterministic fixtures.
func newInMemoryRepo() *inMemoryRepo {
	return &inMemoryRepo{items: map[string]*domain.User{}, audit: make([]domain.AuditLogEntry, 0)}
}

// EnsureSchema initializes schema state required before repository operations.
func (r *inMemoryRepo) EnsureSchema(ctx context.Context) error { return nil }

// Create persists a new entity in the in-memory repository.
func (r *inMemoryRepo) Create(ctx context.Context, user *domain.User) (*domain.User, error) {
	if user.ID == "" {
		user.ID = "user-" + strconv.Itoa(len(r.items)+1)
	}
	now := time.Now().UTC()
	if user.CreatedAt.IsZero() {
		user.CreatedAt = now
	}
	user.UpdatedAt = now
	r.items[user.ID] = user
	return user, nil
}

// GetByID retrieves data from the in-memory repository.
func (r *inMemoryRepo) GetByID(ctx context.Context, id string) (*domain.User, error) {
	if u, ok := r.items[id]; ok && !u.IsDeleted() {
		return u, nil
	}
	return nil, sharederrors.Wrap(sharederrors.CodeUserNotFound, "user not found", nil)
}

// GetByEmail retrieves data from the in-memory repository.
func (r *inMemoryRepo) GetByEmail(ctx context.Context, email string) (*domain.User, error) {
	for _, u := range r.items {
		if u.Email == email && !u.IsDeleted() {
			return u, nil
		}
	}
	return nil, sharederrors.Wrap(sharederrors.CodeUserNotFound, "user not found", nil)
}

// GetByZitadelUserID retrieves data from the in-memory repository.
func (r *inMemoryRepo) GetByZitadelUserID(ctx context.Context, zid string) (*domain.User, error) {
	for _, u := range r.items {
		if u.ZitadelUserID == zid && !u.IsDeleted() {
			return u, nil
		}
	}
	return nil, sharederrors.Wrap(sharederrors.CodeUserNotFound, "user not found", nil)
}

// UpdateProfile updates an existing entity in the in-memory repository.
func (r *inMemoryRepo) UpdateProfile(
	ctx context.Context,
	id, displayName string,
	consent domain.ConsentRecord,
) (*domain.User, error) {
	u, err := r.GetByID(ctx, id)
	if err != nil {
		return nil, err
	}
	u.DisplayName = displayName
	u.ConsentVersion = consent.Version
	u.ConsentGivenAt = consent.GivenAt
	u.ConsentSource = consent.Source
	u.UpdatedAt = time.Now().UTC()
	return u, nil
}

// MarkEmailVerified supports mark email verified test setup and assertions.
func (r *inMemoryRepo) MarkEmailVerified(ctx context.Context, id string) (*domain.User, error) {
	u, err := r.GetByID(ctx, id)
	if err != nil {
		return nil, err
	}
	u.EmailVerified = true
	u.UpdatedAt = time.Now().UTC()
	return u, nil
}

// SoftDelete supports soft delete test setup and assertions.
func (r *inMemoryRepo) SoftDelete(ctx context.Context, id string, actorUserID string) error {
	u, err := r.GetByID(ctx, id)
	if err != nil {
		return err
	}
	now := time.Now().UTC()
	u.DeletedAt = &now
	r.audit = append(
		r.audit,
		domain.AuditLogEntry{
			TargetUserID: id,
			ActorUserID:  actorUserID,
			Action:       domain.AuditActionGDPRDelete,
			CreatedAt:    now,
		},
	)
	return nil
}

// List returns filtered collections from the in-memory repository.
func (r *inMemoryRepo) List(
	ctx context.Context,
	pagination sharedtypes.Pagination,
	filter domain.ListFilter,
) ([]*domain.User, int64, error) {
	out := make([]*domain.User, 0)
	for _, u := range r.items {
		if !filter.IncludeDeleted && u.IsDeleted() {
			continue
		}
		out = append(out, u)
	}
	return out, int64(len(out)), nil
}

// AuditLogsByUserID supports audit logs by user id test setup and assertions.
func (r *inMemoryRepo) AuditLogsByUserID(ctx context.Context, id string) ([]domain.AuditLogEntry, error) {
	out := make([]domain.AuditLogEntry, 0)
	for _, a := range r.audit {
		if a.TargetUserID == id {
			out = append(out, a)
		}
	}
	return out, nil
}

// WriteAuditLog supports write audit log test setup and assertions.
func (r *inMemoryRepo) WriteAuditLog(ctx context.Context, entry domain.AuditLogEntry) error {
	entry.CreatedAt = time.Now().UTC()
	r.audit = append(r.audit, entry)
	return nil
}

// setupApp wires the test application with mocked dependencies.
func setupApp(t *testing.T) (*fiber.App, *inMemoryRepo) {
	t.Helper()

	repo := newInMemoryRepo()
	_, _ = repo.Create(context.Background(), &domain.User{
		ID:             "user-1",
		ZitadelUserID:  "user-1",
		Email:          "player@example.com",
		DisplayName:    "Player One",
		ConsentVersion: "v1",
		ConsentGivenAt: time.Now().UTC(),
		ConsentSource:  "web",
	})
	_, _ = repo.Create(context.Background(), &domain.User{
		ID:             "user-2",
		ZitadelUserID:  "user-2",
		Email:          "other@example.com",
		DisplayName:    "Player Two",
		ConsentVersion: "v1",
		ConsentGivenAt: time.Now().UTC(),
		ConsentSource:  "web",
	})

	svc := appu.NewService(repo)
	metrics := sharedmetrics.NewMetrics(sharedmetrics.Config{
		ServiceName: "user-service-test",
		Enabled:     true,
		Registry:    prometheus.NewRegistry(),
	})
	h := httpapi.NewHandler(svc, validation.NewValidator(), nil, metrics, 50, 200)

	app := fiber.New()
	authMW := func(c fiber.Ctx) error {
		auth := c.Get("Authorization")
		switch auth {
		case "Bearer user-1":
			c.Locals("user_id", "user-1")
			c.Locals("user_email", "player@example.com")
			c.Locals("user_roles", []string{"player"})
			return c.Next()
		case "Bearer admin":
			c.Locals("user_id", "admin-1")
			c.Locals("user_email", "admin@example.com")
			c.Locals("user_roles", []string{"admin"})
			return c.Next()
		default:
			return c.SendStatus(http.StatusUnauthorized)
		}
	}

	httpapi.RegisterRoutes(app, h, authMW, nil)
	app.Get("/metrics", adaptor.HTTPHandler(sharedmetrics.Handler()))
	return app, repo
}

// TestRegisterAndCRUD ensures register and crud behavior is handled correctly.
func TestRegisterAndCRUD(t *testing.T) {
	app, _ := setupApp(t)

	payload, _ := json.Marshal(map[string]any{
		"display_name":    "Player One",
		"consent_version": "v1",
		"consent_source":  "web",
	})
	req := httptest.NewRequest(http.MethodPost, "/users/register", bytes.NewReader(payload))
	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("Authorization", "Bearer user-1")
	resp := sharedhttpx.MustTest(t, app, req)
	sharedhttpx.AssertStatusAndClose(t, resp, http.StatusOK, "register failed")
	defer resp.Body.Close()
	req = httptest.NewRequest(http.MethodGet, "/users/user-1", nil)
	req.Header.Set("Authorization", "Bearer user-1")
	resp = sharedhttpx.MustTest(t, app, req)
	sharedhttpx.AssertStatusAndClose(t, resp, http.StatusOK, "get failed")
	defer resp.Body.Close()

	updatePayload, _ := json.Marshal(map[string]any{
		"display_name":    "Player One Updated",
		"consent_version": "v2",
		"consent_source":  "web",
	})
	req = httptest.NewRequest(http.MethodPut, "/users/user-1", bytes.NewReader(updatePayload))
	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("Authorization", "Bearer user-1")
	resp = sharedhttpx.MustTest(t, app, req)
	sharedhttpx.AssertStatusAndClose(t, resp, http.StatusOK, "update failed")
	defer resp.Body.Close()
	req = httptest.NewRequest(http.MethodDelete, "/users/user-1", nil)
	req.Header.Set("Authorization", "Bearer user-1")
	resp = sharedhttpx.MustTest(t, app, req)
	sharedhttpx.AssertStatusAndClose(t, resp, http.StatusNoContent, "delete failed")
	defer resp.Body.Close()
}

// TestAuthGuardsAndAdminRoutes ensures auth guards and admin routes behavior is handled correctly.
func TestAuthGuardsAndAdminRoutes(t *testing.T) {
	app, _ := setupApp(t)

	req := httptest.NewRequest(http.MethodGet, "/users/user-1", nil)
	resp := sharedhttpx.MustTest(t, app, req)
	sharedhttpx.AssertStatusAndClose(t, resp, http.StatusUnauthorized, "expected unauthorized")
	defer resp.Body.Close()

	req = httptest.NewRequest(http.MethodGet, "/users/user-2", nil)
	req.Header.Set("Authorization", "Bearer user-1")
	resp = sharedhttpx.MustTest(t, app, req)
	sharedhttpx.AssertStatusAndClose(t, resp, http.StatusForbidden, "expected forbidden")
	defer resp.Body.Close()

	req = httptest.NewRequest(http.MethodGet, "/admin/users", nil)
	req.Header.Set("Authorization", "Bearer user-1")
	resp = sharedhttpx.MustTest(t, app, req)
	sharedhttpx.AssertStatusAndClose(t, resp, http.StatusForbidden, "expected admin forbidden")
	defer resp.Body.Close()

	req = httptest.NewRequest(http.MethodGet, "/admin/users", nil)
	req.Header.Set("Authorization", "Bearer admin")
	resp = sharedhttpx.MustTest(t, app, req)
	sharedhttpx.AssertStatusAndClose(t, resp, http.StatusOK, "expected admin list ok")
	defer resp.Body.Close()

	req = httptest.NewRequest(http.MethodPost, "/admin/users/user-2/export", nil)
	req.Header.Set("Authorization", "Bearer admin")
	resp = sharedhttpx.MustTest(t, app, req)
	sharedhttpx.AssertStatusAndClose(t, resp, http.StatusOK, "expected export ok")
	defer resp.Body.Close()
}

// TestMetricsEndpoint ensures metrics endpoint behavior is handled correctly.
func TestMetricsEndpoint(t *testing.T) {
	app, _ := setupApp(t)

	req := httptest.NewRequest(http.MethodGet, "/metrics", nil)
	resp := sharedhttpx.MustTest(t, app, req)
	sharedhttpx.AssertStatusAndClose(t, resp, http.StatusOK, "metrics failed")
	defer resp.Body.Close()
}

// TestVerifyEmailAndValidationPaths ensures verify email and validation paths behavior is handled correctly.
func TestVerifyEmailAndValidationPaths(t *testing.T) {
	app, _ := setupApp(t)

	req := httptest.NewRequest(http.MethodPost, "/users/verify-email", nil)
	resp := sharedhttpx.MustTest(t, app, req)
	sharedhttpx.AssertStatusAndClose(t, resp, http.StatusUnauthorized, "expected unauthorized verify-email")
	defer resp.Body.Close()

	req = httptest.NewRequest(http.MethodPost, "/users/verify-email", nil)
	req.Header.Set("Authorization", "Bearer user-1")
	resp = sharedhttpx.MustTest(t, app, req)
	sharedhttpx.AssertStatusAndClose(t, resp, http.StatusOK, "expected verify-email success")
	defer resp.Body.Close()

	req = httptest.NewRequest(http.MethodGet, "/admin/users?created_after=not-rfc3339", nil)
	req.Header.Set("Authorization", "Bearer admin")
	resp = sharedhttpx.MustTest(t, app, req)
	sharedhttpx.AssertStatusAndClose(t, resp, http.StatusBadRequest, "expected created_after validation failure")
	defer resp.Body.Close()

	req = httptest.NewRequest(http.MethodGet, "/admin/users?created_before=not-rfc3339", nil)
	req.Header.Set("Authorization", "Bearer admin")
	resp = sharedhttpx.MustTest(t, app, req)
	sharedhttpx.AssertStatusAndClose(t, resp, http.StatusBadRequest, "expected created_before validation failure")
	defer resp.Body.Close()
}

// TestRegisterAndUpdateInvalidPayloads ensures register and update invalid payloads behavior is handled correctly.
func TestRegisterAndUpdateInvalidPayloads(t *testing.T) {
	app, _ := setupApp(t)

	req := httptest.NewRequest(http.MethodPost, "/users/register", bytes.NewReader([]byte("{")))
	req.Header.Set("Authorization", "Bearer user-1")
	req.Header.Set("Content-Type", "application/json")
	resp := sharedhttpx.MustTest(t, app, req)
	sharedhttpx.AssertStatusAndClose(t, resp, http.StatusBadRequest, "expected bad json for register")
	defer resp.Body.Close()

	invalidRegister, _ := json.Marshal(map[string]any{
		"display_name":    "",
		"consent_version": "v1",
		"consent_source":  "web",
	})
	req = httptest.NewRequest(http.MethodPost, "/users/register", bytes.NewReader(invalidRegister))
	req.Header.Set("Authorization", "Bearer user-1")
	req.Header.Set("Content-Type", "application/json")
	resp = sharedhttpx.MustTest(t, app, req)
	sharedhttpx.AssertStatusAndClose(t, resp, http.StatusBadRequest, "expected validation error for register")
	defer resp.Body.Close()

	req = httptest.NewRequest(http.MethodPut, "/users/user-1", bytes.NewReader([]byte("{")))
	req.Header.Set("Authorization", "Bearer user-1")
	req.Header.Set("Content-Type", "application/json")
	resp = sharedhttpx.MustTest(t, app, req)
	sharedhttpx.AssertStatusAndClose(t, resp, http.StatusBadRequest, "expected bad json for update")
	defer resp.Body.Close()
}