package v1

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

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

	whatsappchannel "github.com/gochat/gochat/internal/channel/whatsapp"
	"github.com/gochat/gochat/internal/model"
	channelmodel "github.com/gochat/gochat/internal/model/channel"
	"github.com/gochat/gochat/internal/repository"
	"github.com/gochat/gochat/internal/service"
	"github.com/gochat/gochat/internal/worker"
)

// setupInboxMemberActionRouter creates a test router with inbox member-action routes.
// We use nil InboxService since we only test param validation (bad IDs).
// Body/service-level logic is covered in service tests with real DB.
func setupInboxMemberActionRouter(handler *InboxHandler) *gin.Engine {
	gin.SetMode(gin.TestMode)
	r := gin.New()
	r.POST("/api/v1/accounts/:account_id/inboxes/:inbox_id/set_agent_bot", handler.SetAgentBot)
	r.GET("/api/v1/accounts/:account_id/inboxes/:inbox_id/health", handler.Health)
	r.POST("/api/v1/accounts/:account_id/inboxes/:inbox_id/sync_templates", handler.SyncTemplates)
	r.POST("/api/v1/accounts/:account_id/inboxes/:inbox_id/register_webhook", handler.RegisterWebhook)
	r.POST("/api/v1/accounts/:account_id/inboxes/:inbox_id/enable_whatsapp_calling", handler.EnableWhatsAppCalling)
	r.POST("/api/v1/accounts/:account_id/inboxes/:inbox_id/disable_whatsapp_calling", handler.DisableWhatsAppCalling)
	return r
}

func newNilInboxHandler() *InboxHandler {
	return NewInboxHandler(&service.InboxService{})
}

func setupInboxListAccessRouter(t *testing.T) (*gin.Engine, *gorm.DB, *model.Account, *model.User) {
	t.Helper()
	db, err := gorm.Open(sqlite.Open("file:inbox_list_access?mode=memory&cache=shared"), &gorm.Config{Logger: logger.Default.LogMode(logger.Silent)})
	require.NoError(t, err)
	require.NoError(t, db.AutoMigrate(&model.Account{}, &model.User{}, &model.Inbox{}, &model.InboxMember{}, &model.WorkingHour{}))
	account := &model.Account{Name: "Inbox List Access", Locale: "en", Active: true}
	require.NoError(t, db.Create(account).Error)
	user := &model.User{Name: "Scoped Agent", Email: "handler-scoped-agent@example.com"}
	require.NoError(t, db.Create(user).Error)

	handler := NewInboxHandler(service.NewInboxService(repository.NewInboxRepo(db), nil, nil, nil, nil, nil, nil))
	router := gin.New()
	router.Use(func(c *gin.Context) {
		c.Set("user_id", user.ID)
		c.Set("role", "agent")
		c.Next()
	})
	router.GET("/api/v1/accounts/:account_id/inboxes", handler.List)
	return router, db, account, user
}

func TestInboxHandler_ListScopesAgentToAssignedInboxes(t *testing.T) {
	router, db, account, user := setupInboxListAccessRouter(t)
	assigned := &model.Inbox{AccountID: account.ID, Name: "Assigned", ChannelType: "web_widget", ChannelID: 1}
	hidden := &model.Inbox{AccountID: account.ID, Name: "Hidden", ChannelType: "api", ChannelID: 2}
	require.NoError(t, db.Create(assigned).Error)
	require.NoError(t, db.Create(hidden).Error)
	require.NoError(t, db.Create(&model.InboxMember{InboxID: assigned.ID, UserID: user.ID}).Error)

	w := httptest.NewRecorder()
	req := httptest.NewRequest(http.MethodGet, "/api/v1/accounts/1/inboxes", nil)
	router.ServeHTTP(w, req)

	require.Equal(t, http.StatusOK, w.Code, w.Body.String())
	var body struct {
		Payload []map[string]any `json:"payload"`
	}
	require.NoError(t, json.Unmarshal(w.Body.Bytes(), &body))
	require.Len(t, body.Payload, 1)
	assert.Equal(t, "Assigned", body.Payload[0]["name"])
}

type fakeInboxHandlerWhatsAppService struct{}

func (f *fakeInboxHandlerWhatsAppService) FetchMessageTemplates(context.Context, *channelmodel.ChannelWhatsApp) ([]interface{}, error) {
	return nil, nil
}

func (f *fakeInboxHandlerWhatsAppService) FetchHealthStatus(context.Context, *channelmodel.ChannelWhatsApp) (map[string]interface{}, error) {
	return map[string]interface{}{}, nil
}

func (f *fakeInboxHandlerWhatsAppService) SetupWebhook(context.Context, *channelmodel.ChannelWhatsApp, string) error {
	return nil
}

func (f *fakeInboxHandlerWhatsAppService) SetupWebhookFields(context.Context, *channelmodel.ChannelWhatsApp, string, []string) error {
	return nil
}

func (f *fakeInboxHandlerWhatsAppService) UpdateCallingStatus(context.Context, *channelmodel.ChannelWhatsApp, string) error {
	return nil
}

// parseJSONResponse extracts the "error" key from a JSON response body.
func parseJSONError(body []byte) string {
	var resp map[string]interface{}
	if err := json.Unmarshal(body, &resp); err != nil {
		panic(err)
	}
	if v, ok := resp["error"]; ok {
		return v.(string)
	}
	return ""
}

// ========================================
// SetAgentBot — param validation tests
// ========================================

func TestInboxSetAgentBot_BadAccountID(t *testing.T) {
	handler := newNilInboxHandler()
	router := setupInboxMemberActionRouter(handler)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("POST", "/api/v1/accounts/abc/inboxes/5/set_agent_bot", nil)
	router.ServeHTTP(w, req)

	assert.Equal(t, http.StatusBadRequest, w.Code)
	assert.Contains(t, parseJSONError(w.Body.Bytes()), "invalid account id")
}

func TestInboxSetAgentBot_BadInboxID(t *testing.T) {
	handler := newNilInboxHandler()
	router := setupInboxMemberActionRouter(handler)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("POST", "/api/v1/accounts/1/inboxes/xyz/set_agent_bot", nil)
	router.ServeHTTP(w, req)

	assert.Equal(t, http.StatusBadRequest, w.Code)
	assert.Contains(t, parseJSONError(w.Body.Bytes()), "invalid inbox id")
}

// ========================================
// Health — param validation tests
// ========================================

func TestInboxHealth_BadAccountID(t *testing.T) {
	handler := newNilInboxHandler()
	router := setupInboxMemberActionRouter(handler)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("GET", "/api/v1/accounts/abc/inboxes/5/health", nil)
	router.ServeHTTP(w, req)

	assert.Equal(t, http.StatusBadRequest, w.Code)
	assert.Contains(t, parseJSONError(w.Body.Bytes()), "invalid account id")
}

func TestInboxHealth_BadInboxID(t *testing.T) {
	handler := newNilInboxHandler()
	router := setupInboxMemberActionRouter(handler)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("GET", "/api/v1/accounts/1/inboxes/xyz/health", nil)
	router.ServeHTTP(w, req)

	assert.Equal(t, http.StatusBadRequest, w.Code)
	assert.Contains(t, parseJSONError(w.Body.Bytes()), "invalid inbox id")
}

// ========================================
// SyncTemplates — param validation tests
// ========================================

func TestInboxSyncTemplates_BadAccountID(t *testing.T) {
	handler := newNilInboxHandler()
	router := setupInboxMemberActionRouter(handler)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("POST", "/api/v1/accounts/abc/inboxes/5/sync_templates", nil)
	router.ServeHTTP(w, req)

	assert.Equal(t, http.StatusBadRequest, w.Code)
	assert.Contains(t, parseJSONError(w.Body.Bytes()), "invalid account id")
}

func TestInboxSyncTemplates_BadInboxID(t *testing.T) {
	handler := newNilInboxHandler()
	router := setupInboxMemberActionRouter(handler)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("POST", "/api/v1/accounts/1/inboxes/xyz/sync_templates", nil)
	router.ServeHTTP(w, req)

	assert.Equal(t, http.StatusBadRequest, w.Code)
	assert.Contains(t, parseJSONError(w.Body.Bytes()), "invalid inbox id")
}

func TestInboxSyncTemplates_ChatwootQueuedResponse(t *testing.T) {
	db, err := gorm.Open(sqlite.Open("file:inbox_sync_templates_handler?mode=memory&cache=shared"), &gorm.Config{Logger: logger.Default.LogMode(logger.Silent)})
	require.NoError(t, err)
	t.Cleanup(func() {
		sqlDB, dbErr := db.DB()
		if dbErr == nil {
			_ = sqlDB.Close()
		}
	})
	require.NoError(t, db.AutoMigrate(&model.Account{}, &model.Inbox{}, &channelmodel.ChannelWhatsApp{}, &model.BackgroundJob{}))
	account := &model.Account{Name: "Sync Templates", Locale: "en", Active: true}
	require.NoError(t, db.Create(account).Error)
	inbox := &model.Inbox{AccountID: account.ID, Name: "WhatsApp", ChannelType: "whatsapp", ChannelID: 1}
	require.NoError(t, db.Create(inbox).Error)
	channel := &channelmodel.ChannelWhatsApp{AccountID: account.ID, InboxID: inbox.ID, PhoneNumber: "+1555010000", PhoneNumberID: "phone-1", BusinessAccountID: "waba-1", AccessToken: "token", Provider: "whatsapp_cloud"}
	require.NoError(t, db.Create(channel).Error)

	wp := worker.NewWorkerPool(db)
	svc := service.NewInboxService(repository.NewInboxRepo(db), nil, nil, nil, nil, nil, whatsappchannel.NewRepository(db))
	svc.SetWorkerPool(wp)
	handler := NewInboxHandler(svc)
	router := setupInboxMemberActionRouter(handler)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("POST", "/api/v1/accounts/1/inboxes/1/sync_templates", bytes.NewReader(nil))
	router.ServeHTTP(w, req)
	require.Equal(t, http.StatusOK, w.Code, w.Body.String())
	var body map[string]any
	require.NoError(t, json.Unmarshal(w.Body.Bytes(), &body))
	assert.Equal(t, service.InboxTemplateSyncInitiatedMessage, body["message"])
	assert.NotContains(t, body, "templates")
}

// ========================================
// RegisterWebhook — param validation tests
// ========================================

func TestInboxRegisterWebhook_BadAccountID(t *testing.T) {
	handler := newNilInboxHandler()
	router := setupInboxMemberActionRouter(handler)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("POST", "/api/v1/accounts/abc/inboxes/5/register_webhook", nil)
	router.ServeHTTP(w, req)

	assert.Equal(t, http.StatusBadRequest, w.Code)
	assert.Contains(t, parseJSONError(w.Body.Bytes()), "invalid account id")
}

func TestInboxRegisterWebhook_BadInboxID(t *testing.T) {
	handler := newNilInboxHandler()
	router := setupInboxMemberActionRouter(handler)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("POST", "/api/v1/accounts/1/inboxes/xyz/register_webhook", nil)
	router.ServeHTTP(w, req)

	assert.Equal(t, http.StatusBadRequest, w.Code)
	assert.Contains(t, parseJSONError(w.Body.Bytes()), "invalid inbox id")
}

// ========================================
// WhatsApp calling — param and response parity tests
// ========================================

func TestInboxWhatsAppCalling_BadParams(t *testing.T) {
	handler := newNilInboxHandler()
	router := setupInboxMemberActionRouter(handler)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("POST", "/api/v1/accounts/abc/inboxes/5/enable_whatsapp_calling", nil)
	router.ServeHTTP(w, req)
	assert.Equal(t, http.StatusBadRequest, w.Code)
	assert.Contains(t, parseJSONError(w.Body.Bytes()), "invalid account id")

	w = httptest.NewRecorder()
	req, _ = http.NewRequest("POST", "/api/v1/accounts/1/inboxes/xyz/disable_whatsapp_calling", nil)
	router.ServeHTTP(w, req)
	assert.Equal(t, http.StatusBadRequest, w.Code)
	assert.Contains(t, parseJSONError(w.Body.Bytes()), "invalid inbox id")
}

func TestInboxWhatsAppCalling_EnableDisableReturnEmptyOK(t *testing.T) {
	db, err := gorm.Open(sqlite.Open("file:inbox_whatsapp_calling_handler?mode=memory&cache=shared"), &gorm.Config{Logger: logger.Default.LogMode(logger.Silent)})
	require.NoError(t, err)
	t.Cleanup(func() {
		sqlDB, dbErr := db.DB()
		if dbErr == nil {
			_ = sqlDB.Close()
		}
	})
	require.NoError(t, db.AutoMigrate(&model.Account{}, &model.Inbox{}, &channelmodel.ChannelWhatsApp{}))
	account := &model.Account{Name: "Calling", Locale: "en", Active: true, FeatureFlags: `{"channel_voice":true}`}
	require.NoError(t, db.Create(account).Error)
	inbox := &model.Inbox{AccountID: account.ID, Name: "WhatsApp", ChannelType: "whatsapp", ChannelID: 1}
	require.NoError(t, db.Create(inbox).Error)
	channel := &channelmodel.ChannelWhatsApp{AccountID: account.ID, InboxID: inbox.ID, PhoneNumber: "+1555010000", PhoneNumberID: "phone-1", BusinessAccountID: "waba-1", AccessToken: "token", Provider: "whatsapp_cloud"}
	require.NoError(t, db.Create(channel).Error)

	svc := service.NewInboxService(repository.NewInboxRepo(db), nil, nil, nil, nil, &fakeInboxHandlerWhatsAppService{}, whatsappchannel.NewRepository(db))
	handler := NewInboxHandler(svc)
	router := setupInboxMemberActionRouter(handler)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("POST", "/api/v1/accounts/1/inboxes/1/enable_whatsapp_calling", nil)
	router.ServeHTTP(w, req)
	require.Equal(t, http.StatusOK, w.Code, w.Body.String())
	assert.Empty(t, w.Body.String())

	w = httptest.NewRecorder()
	req, _ = http.NewRequest("POST", "/api/v1/accounts/1/inboxes/1/disable_whatsapp_calling", nil)
	router.ServeHTTP(w, req)
	require.Equal(t, http.StatusOK, w.Code, w.Body.String())
	assert.Empty(t, w.Body.String())
}