package v1

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

	"github.com/gin-gonic/gin"
	"github.com/stretchr/testify/suite"
	"gorm.io/driver/sqlite"
	"gorm.io/gorm"
	"gorm.io/gorm/logger"

	"github.com/gochat/gochat/internal/model"
	"github.com/gochat/gochat/internal/repository"
	"github.com/gochat/gochat/internal/service"
)

// IntegrationHookHandlerSuite tests IntegrationHookHandler with real SQLite DB + real service.
type IntegrationHookHandlerSuite struct {
	suite.Suite

	db      *gorm.DB
	router  *gin.Engine
	handler *IntegrationHookHandler
}

func (s *IntegrationHookHandlerSuite) SetupSuite() {
	gin.SetMode(gin.TestMode)

	db, err := gorm.Open(sqlite.Open("file::memory:"), &gorm.Config{
		Logger: logger.Default.LogMode(logger.Silent),
	})
	s.Require().NoError(err, "failed to open SQLite test database")
	s.Require().NoError(db.AutoMigrate(
		&model.Account{},
		&model.User{},
		&model.AccountUser{},
		&model.Inbox{},
		&model.IntegrationHook{},
		&model.IntegrationApp{},
	), "failed to auto-migrate models")
	s.db = db

	hookRepo := repository.NewIntegrationHookRepo(db)
	appRepo := repository.NewIntegrationAppRepo(db)
	svc := service.NewIntegrationHookService(hookRepo, appRepo, nil) // nil registry for handler tests
	s.handler = NewIntegrationHookHandler(svc)

	r := gin.New()
	r.Use(gin.Recovery(), mockAuthMiddlewareForHook())
	g := r.Group("/api/v1/accounts/:account_id/integrations")
	RegisterIntegrationHookRoutes(g, s.handler)
	s.router = r
}

func (s *IntegrationHookHandlerSuite) TearDownSuite() {
	sqlDB, err := s.db.DB()
	if err == nil {
		sqlDB.Close()
	}
}

func (s *IntegrationHookHandlerSuite) SetupTest() {
	s.db.Exec("DELETE FROM integration_hooks")
	s.db.Exec("DELETE FROM integration_apps")
}

func (s *IntegrationHookHandlerSuite) uid(id uint) string {
	return strconv.FormatUint(uint64(id), 10)
}

// --- Helper: create an IntegrationApp directly in DB ---
func (s *IntegrationHookHandlerSuite) createApp(name string, hookType model.HookType) *model.IntegrationApp {
	app := &model.IntegrationApp{
		Name:     name,
		HookType: hookType,
		Enabled:  true,
	}
	s.Require().NoError(s.db.Create(app).Error)
	return app
}

// --- Helper: create an IntegrationHook directly in DB ---
var hookTokenCounter = 0

func (s *IntegrationHookHandlerSuite) createHook(accountID uint, hookType model.HookType, url string) *model.IntegrationHook {
	hookTokenCounter++
	token := "test_token_" + strconv.Itoa(hookTokenCounter)
	hook := &model.IntegrationHook{
		AccountID:   accountID,
		AppID:       string(hookType),
		HookType:    hookType,
		Status:      model.HookStatusActive,
		URL:         url,
		AccessToken: token,
	}
	s.Require().NoError(s.db.Create(hook).Error)
	return hook
}

// =====================
// ListApps tests
// =====================

func (s *IntegrationHookHandlerSuite) TestListApps_Success() {
	s.createApp("Webhook App", model.HookTypeWebhook)
	s.createApp("Slack App", model.HookTypeSlack)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("GET", "/api/v1/accounts/1/integrations/apps/", nil)
	s.router.ServeHTTP(w, req)
	s.Equal(http.StatusOK, w.Code)

	var body map[string]interface{}
	s.NoError(json.Unmarshal(w.Body.Bytes(), &body))
	data := body["payload"].([]interface{})
	s.Len(data, 2)
	app := data[0].(map[string]interface{})
	s.Contains(app, "hooks")
}

func (s *IntegrationHookHandlerSuite) TestListApps_Empty() {
	w := httptest.NewRecorder()
	req, _ := http.NewRequest("GET", "/api/v1/accounts/1/integrations/apps/", nil)
	s.router.ServeHTTP(w, req)
	s.Equal(http.StatusOK, w.Code)

	var body map[string]interface{}
	s.NoError(json.Unmarshal(w.Body.Bytes(), &body))
	data := body["payload"].([]interface{})
	s.Len(data, 0)
}

// =====================
// GetApp tests
// =====================

func (s *IntegrationHookHandlerSuite) TestGetApp_Success() {
	s.createApp("Slack App", model.HookTypeSlack)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("GET", "/api/v1/accounts/1/integrations/apps/slack", nil)
	s.router.ServeHTTP(w, req)
	s.Equal(http.StatusOK, w.Code)

	var body map[string]interface{}
	s.NoError(json.Unmarshal(w.Body.Bytes(), &body))
	s.Equal("slack", body["id"])
	s.Equal("Slack App", body["name"])
}

func (s *IntegrationHookHandlerSuite) TestGetApp_UnknownID() {
	w := httptest.NewRecorder()
	req, _ := http.NewRequest("GET", "/api/v1/accounts/1/integrations/apps/unknown", nil)
	s.router.ServeHTTP(w, req)
	s.Equal(http.StatusNotFound, w.Code)
}

func (s *IntegrationHookHandlerSuite) TestGetApp_NotFound() {
	w := httptest.NewRecorder()
	req, _ := http.NewRequest("GET", "/api/v1/accounts/1/integrations/apps/9999", nil)
	s.router.ServeHTTP(w, req)
	s.Equal(http.StatusNotFound, w.Code)
}

// =====================
// ListHooks tests
// =====================

func (s *IntegrationHookHandlerSuite) TestListHooks_Success() {
	s.createHook(1, model.HookTypeWebhook, "https://example.com/hook1")
	s.createHook(1, model.HookTypeSlack, "https://example.com/hook2")

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("GET", "/api/v1/accounts/1/integrations/hooks/", nil)
	s.router.ServeHTTP(w, req)
	s.Equal(http.StatusOK, w.Code)

	var body map[string]interface{}
	s.NoError(json.Unmarshal(w.Body.Bytes(), &body))
	s.Equal(true, body["success"])

	data := body["data"].([]interface{})
	s.Len(data, 2)
}

func (s *IntegrationHookHandlerSuite) TestListHooks_Empty() {
	w := httptest.NewRecorder()
	req, _ := http.NewRequest("GET", "/api/v1/accounts/1/integrations/hooks/", nil)
	s.router.ServeHTTP(w, req)
	s.Equal(http.StatusOK, w.Code)

	var body map[string]interface{}
	s.NoError(json.Unmarshal(w.Body.Bytes(), &body))
	s.Equal(true, body["success"])

	data := body["data"].([]interface{})
	s.Len(data, 0)
}

// =====================
// GetHook tests
// =====================

func (s *IntegrationHookHandlerSuite) TestGetHook_Success() {
	hook := s.createHook(1, model.HookTypeWebhook, "https://example.com/hook")

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("GET", "/api/v1/accounts/1/integrations/hooks/"+s.uid(hook.ID), nil)
	s.router.ServeHTTP(w, req)
	s.Equal(http.StatusOK, w.Code)

	var body map[string]interface{}
	s.NoError(json.Unmarshal(w.Body.Bytes(), &body))
	s.Equal("webhook", body["app_id"])
	s.Equal("account", body["hook_type"])
	s.Equal(true, body["status"])
}

func (s *IntegrationHookHandlerSuite) TestGetHook_NotFound() {
	w := httptest.NewRecorder()
	req, _ := http.NewRequest("GET", "/api/v1/accounts/1/integrations/hooks/9999", nil)
	s.router.ServeHTTP(w, req)
	s.Equal(http.StatusNotFound, w.Code)
}

// =====================
// CreateHook tests
// =====================

func (s *IntegrationHookHandlerSuite) TestCreateHook_Success() {
	body, _ := json.Marshal(map[string]interface{}{
		"app_id": "webhook",
		"settings": map[string]interface{}{
			"project_id": "project-1",
		},
	})

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("POST", "/api/v1/accounts/1/integrations/hooks/", bytes.NewBuffer(body))
	req.Header.Set("Content-Type", "application/json")
	s.router.ServeHTTP(w, req)
	s.Equal(http.StatusOK, w.Code)

	var resp map[string]interface{}
	s.NoError(json.Unmarshal(w.Body.Bytes(), &resp))
	s.Equal("webhook", resp["app_id"])
	s.Equal("account", resp["hook_type"])
	s.Equal(true, resp["status"])
	s.NotNil(resp["id"])
	settings := resp["settings"].(map[string]interface{})
	s.Equal("project-1", settings["project_id"])
}

func (s *IntegrationHookHandlerSuite) TestCreateHook_InvalidJSON() {
	w := httptest.NewRecorder()
	req, _ := http.NewRequest("POST", "/api/v1/accounts/1/integrations/hooks/", bytes.NewBufferString("{invalid"))
	req.Header.Set("Content-Type", "application/json")
	s.router.ServeHTTP(w, req)
	s.Equal(http.StatusBadRequest, w.Code)
}

func (s *IntegrationHookHandlerSuite) TestCreateHook_InvalidAccountID() {
	w := httptest.NewRecorder()
	req, _ := http.NewRequest("POST", "/api/v1/accounts/abc/integrations/hooks/", bytes.NewBufferString(`{"hook_type":"webhook","url":"https://example.com"}`))
	req.Header.Set("Content-Type", "application/json")
	s.router.ServeHTTP(w, req)
	s.Equal(http.StatusBadRequest, w.Code)
}

// =====================
// UpdateHook tests
// =====================

func (s *IntegrationHookHandlerSuite) TestUpdateHook_Success() {
	hook := s.createHook(1, model.HookTypeWebhook, "https://example.com/hook")

	body, _ := json.Marshal(map[string]interface{}{"hook": map[string]interface{}{
		"status":       "disabled",
		"reference_id": "ref-123",
		"settings": map[string]interface{}{
			"channel": "support",
		},
	}})

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("PUT", "/api/v1/accounts/1/integrations/hooks/"+s.uid(hook.ID), bytes.NewBuffer(body))
	req.Header.Set("Content-Type", "application/json")
	s.router.ServeHTTP(w, req)
	s.Equal(http.StatusOK, w.Code)

	var resp map[string]interface{}
	s.NoError(json.Unmarshal(w.Body.Bytes(), &resp))
	s.Equal(false, resp["status"])
	s.Equal("ref-123", resp["reference_id"])
	settings := resp["settings"].(map[string]interface{})
	s.Equal("support", settings["channel"])
}

func (s *IntegrationHookHandlerSuite) TestUpdateHook_NotFound() {
	body, _ := json.Marshal(map[string]interface{}{"hook": map[string]string{
		"url": "https://example.com/updated",
	}})

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("PUT", "/api/v1/accounts/1/integrations/hooks/9999", bytes.NewBuffer(body))
	req.Header.Set("Content-Type", "application/json")
	s.router.ServeHTTP(w, req)
	s.Equal(http.StatusNotFound, w.Code)
}

func (s *IntegrationHookHandlerSuite) TestUpdateHook_InvalidJSON() {
	s.createHook(1, model.HookTypeWebhook, "https://example.com/hook")

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("PUT", "/api/v1/accounts/1/integrations/hooks/1", bytes.NewBufferString("{bad"))
	req.Header.Set("Content-Type", "application/json")
	s.router.ServeHTTP(w, req)
	s.Equal(http.StatusBadRequest, w.Code)
}

func (s *IntegrationHookHandlerSuite) TestUpdateHook_InvalidID() {
	body, _ := json.Marshal(map[string]interface{}{"hook": map[string]string{"url": "https://example.com/updated"}})
	w := httptest.NewRecorder()
	req, _ := http.NewRequest("PUT", "/api/v1/accounts/1/integrations/hooks/abc", bytes.NewBuffer(body))
	req.Header.Set("Content-Type", "application/json")
	s.router.ServeHTTP(w, req)
	s.Equal(http.StatusBadRequest, w.Code)
}

// =====================
// DeleteHook tests
// =====================

func (s *IntegrationHookHandlerSuite) TestDeleteHook_Success() {
	hook := s.createHook(1, model.HookTypeWebhook, "https://example.com/hook")

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("DELETE", "/api/v1/accounts/1/integrations/hooks/"+s.uid(hook.ID), nil)
	s.router.ServeHTTP(w, req)
	s.Equal(http.StatusOK, w.Code)
	s.Empty(w.Body.String())
}

func (s *IntegrationHookHandlerSuite) TestDeleteHook_NotFound() {
	w := httptest.NewRecorder()
	req, _ := http.NewRequest("DELETE", "/api/v1/accounts/1/integrations/hooks/9999", nil)
	s.router.ServeHTTP(w, req)
	s.Equal(http.StatusNotFound, w.Code)
}

func (s *IntegrationHookHandlerSuite) TestDeleteHook_InvalidID() {
	w := httptest.NewRecorder()
	req, _ := http.NewRequest("DELETE", "/api/v1/accounts/1/integrations/hooks/abc", nil)
	s.router.ServeHTTP(w, req)
	s.Equal(http.StatusBadRequest, w.Code)
}

// =====================
// ProcessHookEvent tests
// =====================

func (s *IntegrationHookHandlerSuite) TestProcessHookEvent_Success() {
	hook := s.createHook(1, model.HookTypeWebhook, "https://example.com/hook")

	eventData, _ := json.Marshal(map[string]interface{}{
		"event":   "message_created",
		"content": "Hello world",
	})

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("POST", "/api/v1/accounts/1/integrations/hooks/"+s.uid(hook.ID)+"/process_event", bytes.NewBuffer(eventData))
	req.Header.Set("Content-Type", "application/json")
	s.router.ServeHTTP(w, req)
	s.Equal(http.StatusOK, w.Code)

	var resp map[string]interface{}
	s.NoError(json.Unmarshal(w.Body.Bytes(), &resp))
	s.Equal("event processed", resp["message"])
}

func (s *IntegrationHookHandlerSuite) TestProcessHookEvent_NotFound() {
	eventData, _ := json.Marshal(map[string]interface{}{"event": "test"})

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("POST", "/api/v1/accounts/1/integrations/hooks/9999/process_event", bytes.NewBuffer(eventData))
	req.Header.Set("Content-Type", "application/json")
	s.router.ServeHTTP(w, req)
	s.Equal(http.StatusNotFound, w.Code)
}

func (s *IntegrationHookHandlerSuite) TestProcessHookEvent_InvalidJSON() {
	hook := s.createHook(1, model.HookTypeWebhook, "https://example.com/hook")

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("POST", "/api/v1/accounts/1/integrations/hooks/"+s.uid(hook.ID)+"/process_event", bytes.NewBufferString("{bad"))
	req.Header.Set("Content-Type", "application/json")
	s.router.ServeHTTP(w, req)
	s.Equal(http.StatusBadRequest, w.Code)
}

func (s *IntegrationHookHandlerSuite) TestProcessHookEvent_InvalidHookID() {
	eventData, _ := json.Marshal(map[string]interface{}{"event": "test"})

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("POST", "/api/v1/accounts/1/integrations/hooks/abc/process_event", bytes.NewBuffer(eventData))
	req.Header.Set("Content-Type", "application/json")
	s.router.ServeHTTP(w, req)
	s.Equal(http.StatusBadRequest, w.Code)
}

func (s *IntegrationHookHandlerSuite) TestProcessHookEvent_InactiveHook() {
	// Create a hook with inactive status
	hookTokenCounter++
	hook := &model.IntegrationHook{
		AccountID:   1,
		AppID:       "webhook",
		HookType:    model.HookTypeWebhook,
		Status:      model.HookStatusInactive,
		URL:         "https://example.com/hook",
		AccessToken: "test_token_inactive",
	}
	s.Require().NoError(s.db.Create(hook).Error)

	eventData, _ := json.Marshal(map[string]interface{}{"event": "test"})

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("POST", "/api/v1/accounts/1/integrations/hooks/"+s.uid(hook.ID)+"/process_event", bytes.NewBuffer(eventData))
	req.Header.Set("Content-Type", "application/json")
	s.router.ServeHTTP(w, req)
	// Inactive hook returns service error → 500 via handleServiceError
	s.True(w.Code == http.StatusUnprocessableEntity || w.Code == http.StatusBadRequest)
}

// TestIntegrationHookHandlerSuite runs the suite.
func TestIntegrationHookHandlerSuite(t *testing.T) {
	suite.Run(t, new(IntegrationHookHandlerSuite))
}