package handler

import (
	"baron-sso-backend/internal/domain"
	"baron-sso-backend/internal/service"
	"bytes"
	"context"
	"encoding/json"
	"fmt"
	"net/http"
	"net/http/httptest"
	"testing"
	"time"

	"github.com/gofiber/fiber/v2"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/mock"
)

// --- Mocks with Unique Names to Avoid Collisions ---

type devMockKetoService struct {
	mock.Mock
}

func (m *devMockKetoService) CheckPermission(ctx context.Context, subject, namespace, object, relation string) (bool, error) {
	args := m.Called(ctx, subject, namespace, object, relation)
	return args.Bool(0), args.Error(1)
}

func (m *devMockKetoService) CreateRelation(ctx context.Context, ns, obj, rel, sub string) error {
	return m.Called(ctx, ns, obj, rel, sub).Error(0)
}

func (m *devMockKetoService) DeleteRelation(ctx context.Context, ns, obj, rel, sub string) error {
	return m.Called(ctx, ns, obj, rel, sub).Error(0)
}

func (m *devMockKetoService) ListRelations(ctx context.Context, ns, obj, rel, sub string) ([]service.RelationTuple, error) {
	args := m.Called(ctx, ns, obj, rel, sub)
	return args.Get(0).([]service.RelationTuple), args.Error(1)
}

func (m *devMockKetoService) ListObjects(ctx context.Context, ns, rel, sub string) ([]string, error) {
	args := m.Called(ctx, ns, rel, sub)
	return args.Get(0).([]string), args.Error(1)
}

type devMockRedisRepo struct {
	data map[string]string
}

func (m *devMockRedisRepo) Set(key, value string, exp time.Duration) error {
	if m.data == nil {
		m.data = make(map[string]string)
	}
	m.data[key] = value
	return nil
}

func (m *devMockRedisRepo) Get(key string) (string, error) {
	v, ok := m.data[key]
	if !ok {
		return "", fmt.Errorf("not found")
	}
	return v, nil
}

func (m *devMockRedisRepo) Delete(key string) error {
	delete(m.data, key)
	return nil
}
func (m *devMockRedisRepo) StoreVerificationCode(p, c string) error      { return nil }
func (m *devMockRedisRepo) GetVerificationCode(p string) (string, error) { return "", nil }
func (m *devMockRedisRepo) DeleteVerificationCode(p string) error        { return nil }

type devEnhancedMockAuditRepo struct {
	mockAuditRepo
	countFailures int64
	countSessions int64
}

func (m *devEnhancedMockAuditRepo) CountFailuresSince(ctx context.Context, s time.Time, t string) (int64, error) {
	return m.countFailures, nil
}

func (m *devEnhancedMockAuditRepo) CountActiveSessionsSince(ctx context.Context, s time.Time, t string) (int64, error) {
	return m.countSessions, nil
}

// --- Tests ---

func TestListClients_Success(t *testing.T) {
	transport := roundTripFunc(func(r *http.Request) (*http.Response, error) {
		if r.URL.Path == "/clients" {
			return httpJSONAny(r, http.StatusOK, []map[string]interface{}{
				{"client_id": "client-1", "client_name": "App One", "metadata": map[string]interface{}{"status": "active"}},
				{"client_id": "client-2", "client_name": "App Two", "metadata": map[string]interface{}{"status": "inactive"}},
			}), nil
		}
		return httpJSONAny(r, http.StatusNotFound, nil), nil
	})

	mockKeto := new(devMockKetoService)
	mockKeto.On("CheckPermission", mock.Anything, mock.Anything, "System", "AppManager", "member").Return(true, nil)

	h := &DevHandler{
		Hydra: &service.HydraAdminService{
			AdminURL:   "http://hydra.test",
			HTTPClient: &http.Client{Transport: transport},
		},
		Keto: mockKeto,
	}
	app := fiber.New()
	app.Use(func(c *fiber.Ctx) error {
		c.Locals("user_profile", &domain.UserProfileResponse{ID: "test-user", Role: domain.RoleSuperAdmin})
		return c.Next()
	})
	app.Get("/api/v1/dev/clients", h.ListClients)

	req := httptest.NewRequest(http.MethodGet, "/api/v1/dev/clients", nil)
	resp, _ := app.Test(req, -1)

	assert.Equal(t, http.StatusOK, resp.StatusCode)
}

func TestUpdateClientStatus_Success(t *testing.T) {
	transport := roundTripFunc(func(r *http.Request) (*http.Response, error) {
		if r.Method == http.MethodGet && r.URL.Path == "/clients/client-1" {
			return httpJSONAny(r, http.StatusOK, map[string]interface{}{
				"client_id": "client-1", "metadata": map[string]interface{}{"status": "active"},
			}), nil
		}
		if r.Method == http.MethodPatch && r.URL.Path == "/clients/client-1" {
			return httpJSONAny(r, http.StatusOK, map[string]interface{}{
				"client_id": "client-1", "metadata": map[string]interface{}{"status": "inactive"},
			}), nil
		}
		return httpJSONAny(r, http.StatusNotFound, nil), nil
	})

	h := &DevHandler{
		Hydra: &service.HydraAdminService{
			AdminURL:   "http://hydra.test",
			HTTPClient: &http.Client{Transport: transport},
		},
		Keto: new(devMockKetoService),
	}
	app := fiber.New()
	app.Use(func(c *fiber.Ctx) error {
		c.Locals("user_profile", &domain.UserProfileResponse{ID: "user-1", Role: domain.RoleSuperAdmin})
		return c.Next()
	})
	app.Patch("/api/v1/dev/clients/:id/status", h.UpdateClientStatus)

	body, _ := json.Marshal(map[string]interface{}{"status": "inactive"})
	req := httptest.NewRequest(http.MethodPatch, "/api/v1/dev/clients/client-1/status", bytes.NewReader(body))
	req.Header.Set("Content-Type", "application/json")
	resp, _ := app.Test(req, -1)

	assert.Equal(t, http.StatusOK, resp.StatusCode)
	var res clientDetailResponse
	json.NewDecoder(resp.Body).Decode(&res)
	assert.Equal(t, "inactive", res.Client.Status)
}

func TestDeleteClient_Success(t *testing.T) {
	transport := roundTripFunc(func(r *http.Request) (*http.Response, error) {
		if r.Method == http.MethodGet && r.URL.Path == "/clients/client-1" {
			return httpJSONAny(r, http.StatusOK, map[string]interface{}{"client_id": "client-1"}), nil
		}
		if r.Method == http.MethodDelete && r.URL.Path == "/clients/client-1" {
			return &http.Response{StatusCode: http.StatusNoContent, Body: http.NoBody}, nil
		}
		return httpJSONAny(r, http.StatusNotFound, nil), nil
	})

	secretRepo := &mockSecretRepo{secrets: map[string]string{"client-1": "secret"}}
	redisRepo := &devMockRedisRepo{data: map[string]string{"client_secret:client-1": "secret"}}

	h := &DevHandler{
		Hydra: &service.HydraAdminService{
			AdminURL:   "http://hydra.test",
			HTTPClient: &http.Client{Transport: transport},
		},
		SecretRepo: secretRepo,
		Redis:      redisRepo,
		Keto:       new(devMockKetoService),
	}
	app := fiber.New()
	app.Use(func(c *fiber.Ctx) error {
		c.Locals("user_profile", &domain.UserProfileResponse{ID: "user-1", Role: domain.RoleSuperAdmin})
		return c.Next()
	})
	app.Delete("/api/v1/dev/clients/:id", h.DeleteClient)

	req := httptest.NewRequest(http.MethodDelete, "/api/v1/dev/clients/client-1", nil)
	resp, _ := app.Test(req, -1)

	assert.Equal(t, http.StatusNoContent, resp.StatusCode)
	s, _ := secretRepo.GetByID(nil, "client-1")
	assert.Empty(t, s)
	_, err := redisRepo.Get("client_secret:client-1")
	assert.Error(t, err)
}

func TestRotateClientSecret_Success(t *testing.T) {
	transport := roundTripFunc(func(r *http.Request) (*http.Response, error) {
		if r.Method == http.MethodGet && r.URL.Path == "/clients/client-1" {
			return httpJSONAny(r, http.StatusOK, map[string]interface{}{"client_id": "client-1"}), nil
		}
		if r.Method == http.MethodPut && r.URL.Path == "/clients/client-1" {
			var body map[string]interface{}
			json.NewDecoder(r.Body).Decode(&body)
			return httpJSONAny(r, http.StatusOK, body), nil
		}
		return httpJSONAny(r, http.StatusNotFound, nil), nil
	})

	secretRepo := &mockSecretRepo{secrets: make(map[string]string)}
	redisRepo := &devMockRedisRepo{data: make(map[string]string)}

	h := &DevHandler{
		Hydra: &service.HydraAdminService{
			AdminURL:   "http://hydra.test",
			HTTPClient: &http.Client{Transport: transport},
		},
		SecretRepo: secretRepo,
		Redis:      redisRepo,
		Keto:       new(devMockKetoService),
	}
	app := fiber.New()
	app.Use(func(c *fiber.Ctx) error {
		c.Locals("user_profile", &domain.UserProfileResponse{ID: "user-1", Role: domain.RoleSuperAdmin})
		return c.Next()
	})
	app.Post("/api/v1/dev/clients/:id/secret/rotate", h.RotateClientSecret)

	req := httptest.NewRequest(http.MethodPost, "/api/v1/dev/clients/client-1/secret/rotate", nil)
	resp, _ := app.Test(req, -1)

	assert.Equal(t, http.StatusOK, resp.StatusCode)
	var res clientDetailResponse
	json.NewDecoder(resp.Body).Decode(&res)
	assert.NotEmpty(t, res.Client.ClientSecret)

	dbS, _ := secretRepo.GetByID(nil, "client-1")
	assert.Equal(t, res.Client.ClientSecret, dbS)
}

func TestGetStats_Success(t *testing.T) {
	transport := roundTripFunc(func(r *http.Request) (*http.Response, error) {
		if r.URL.Path == "/clients" {
			return httpJSONAny(r, http.StatusOK, []map[string]interface{}{
				{"client_id": "c1", "metadata": map[string]interface{}{"tenant_id": "t1"}},
				{"client_id": "c2", "metadata": map[string]interface{}{"tenant_id": "t1"}},
				{"client_id": "c3", "metadata": map[string]interface{}{"tenant_id": "t2"}},
			}), nil
		}
		return httpJSONAny(r, http.StatusNotFound, nil), nil
	})

	auditRepo := &devEnhancedMockAuditRepo{
		countFailures: 7,
		countSessions: 3,
	}

	mockKeto := new(devMockKetoService)

	h := &DevHandler{
		Hydra: &service.HydraAdminService{
			AdminURL:   "http://hydra.test",
			HTTPClient: &http.Client{Transport: transport},
		},
		AuditRepo: auditRepo,
		Keto:      mockKeto,
	}
	app := fiber.New()
	tenantID := "t1"
	app.Use(func(c *fiber.Ctx) error {
		c.Locals("user_profile", &domain.UserProfileResponse{
			ID: "u1", Role: domain.RoleTenantAdmin, TenantID: &tenantID,
		})
		return c.Next()
	})
	app.Get("/api/v1/dev/stats", h.GetStats)

	req := httptest.NewRequest(http.MethodGet, "/api/v1/dev/stats", nil)
	resp, _ := app.Test(req, -1)

	assert.Equal(t, http.StatusOK, resp.StatusCode)
	var res devStatsResponse
	json.NewDecoder(resp.Body).Decode(&res)

	assert.Equal(t, int64(2), res.TotalClients)
	assert.Equal(t, int64(7), res.AuthFailures)
	assert.Equal(t, int64(3), res.ActiveSessions)
	mockKeto.AssertNotCalled(t, "CheckPermission", mock.Anything, mock.Anything, "System", "AppManager", "member")
}

func TestDevHandler_NoAuditNoAction(t *testing.T) {
	h := &DevHandler{
		Hydra:     &service.HydraAdminService{AdminURL: "http://hydra.test"},
		AuditRepo: nil, // Missing
		Keto:      new(devMockKetoService),
	}

	t.Run("Mutating action fails when audit log is unavailable", func(t *testing.T) {
		app := fiber.New()
		app.Use(func(c *fiber.Ctx) error {
			if h.AuditRepo == nil {
				return c.Status(fiber.StatusServiceUnavailable).JSON(fiber.Map{"error": "Audit service unavailable"})
			}
			return c.Next()
		})
		app.Post("/api/v1/dev/clients", h.CreateClient)

		req := httptest.NewRequest(http.MethodPost, "/api/v1/dev/clients", bytes.NewReader([]byte("{}")))
		resp, _ := app.Test(req, -1)

		assert.Equal(t, http.StatusServiceUnavailable, resp.StatusCode)
	})
}

func TestListAuditLogs_TenantMemberForbidden(t *testing.T) {
	h := &DevHandler{
		Hydra:     &service.HydraAdminService{AdminURL: "http://hydra.test"},
		AuditRepo: &mockAuditRepo{},
		Keto:      new(devMockKetoService),
	}

	app := fiber.New()
	tenantID := "tenant-a"
	app.Use(func(c *fiber.Ctx) error {
		c.Locals("user_profile", &domain.UserProfileResponse{
			ID:       "u-member",
			Role:     domain.RoleUser,
			TenantID: &tenantID,
		})
		return c.Next()
	})
	app.Get("/api/v1/dev/audit-logs", h.ListAuditLogs)

	req := httptest.NewRequest(http.MethodGet, "/api/v1/dev/audit-logs", nil)
	resp, _ := app.Test(req, -1)
	assert.Equal(t, http.StatusForbidden, resp.StatusCode)
}

func TestListAuditLogs_RPAdminScope(t *testing.T) {
	auditRepo := &mockAuditRepo{
		logs: []domain.AuditLog{
			{
				EventID:   "evt-1",
				EventType: "POST /api/v1/dev/clients",
				Status:    "success",
				Timestamp: time.Now().UTC(),
				Details:   `{"target_id":"client-allowed","tenant_id":"tenant-a","action":"CREATE_CLIENT"}`,
			},
			{
				EventID:   "evt-2",
				EventType: "POST /api/v1/dev/clients",
				Status:    "success",
				Timestamp: time.Now().UTC().Add(-time.Minute),
				Details:   `{"target_id":"client-other","tenant_id":"tenant-a","action":"CREATE_CLIENT"}`,
			},
		},
	}

	h := &DevHandler{
		Hydra:     &service.HydraAdminService{AdminURL: "http://hydra.test"},
		AuditRepo: auditRepo,
		Keto:      new(devMockKetoService),
	}

	app := fiber.New()
	tenantID := "tenant-a"
	app.Use(func(c *fiber.Ctx) error {
		c.Locals("user_profile", &domain.UserProfileResponse{
			ID:       "u-rp-admin",
			Role:     domain.RoleRPAdmin,
			TenantID: &tenantID,
			Metadata: map[string]any{
				"managed_client_ids": []any{"client-allowed"},
			},
		})
		return c.Next()
	})
	app.Get("/api/v1/dev/audit-logs", h.ListAuditLogs)

	req := httptest.NewRequest(http.MethodGet, "/api/v1/dev/audit-logs?limit=50", nil)
	resp, _ := app.Test(req, -1)
	assert.Equal(t, http.StatusOK, resp.StatusCode)

	var result devAuditListResponse
	_ = json.NewDecoder(resp.Body).Decode(&result)
	assert.Len(t, result.Items, 1)
	assert.Equal(t, "evt-1", result.Items[0].EventID)
}