package v1

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

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

	channelmodel "github.com/gochat/gochat/internal/model/channel"
	"github.com/gochat/gochat/internal/model"

	"github.com/gochat/gochat/internal/channel/whatsapp"
	"github.com/gochat/gochat/internal/repository"
	"github.com/gochat/gochat/internal/service"
)

// ── Setup helpers ────────────────────────────────────────────────

func setupTikTokHandlerTest(t *testing.T) (*TikTokChannelHandler, *gorm.DB) {
	t.Helper()
	db, err := gorm.Open(sqlite.Open("file::memory:?cache=shared"), &gorm.Config{})
	require.NoError(t, err)

	require.NoError(t, db.AutoMigrate(
		&model.Account{},
		&model.Inbox{},
		&model.AgentBot{},
		&model.AgentBotInbox{},
		&model.WebhookSubscription{},
		&channelmodel.ChannelTikTok{},
	))
	t.Cleanup(func() {
		sqlDB, _ := db.DB()
		sqlDB.Close()
	})

	// Build handler dependencies (nil provider — Create happy path skipped; Get/Update/Delete/List don't use provider)
	ttRepo := repository.NewChannelTikTokRepo(db)
	ttChannelSvc := service.NewChannelTikTokService(ttRepo)

	inboxRepo := repository.NewInboxRepo(db)
	agentBotInboxRepo := repository.NewAgentBotInboxRepo(db)
	agentBotRepo := repository.NewAgentBotRepo(db)
	campaignRepo := repository.NewCampaignRepo(db)
	webhookSubRepo := repository.NewWebhookSubscriptionRepo(db)
	waRepo := whatsapp.NewRepository(db)
	waService := whatsapp.NewWhatsAppService(waRepo)
	inboxSvc := service.NewInboxService(inboxRepo, agentBotInboxRepo, agentBotRepo, campaignRepo, webhookSubRepo, waService, waRepo)

	handler := NewTikTokChannelHandler(ttChannelSvc, nil, inboxSvc, ttRepo)

	// Seed an account
	account := &model.Account{Name: "TikTokTestOrg", Locale: "en", Active: true}
	require.NoError(t, db.Create(account).Error)

	return handler, db
}

func tikTokAccountID(db *gorm.DB) string {
	var account model.Account
	db.First(&account)
	return strconv.FormatUint(uint64(account.ID), 10)
}

func tikTokAccountIDUint(db *gorm.DB) uint {
	var account model.Account
	db.First(&account)
	return account.ID
}

func setupTikTokTestRouter(handler *TikTokChannelHandler) *gin.Engine {
	gin.SetMode(gin.TestMode)
	r := gin.New()
	ag := r.Group("/api/v1/accounts/:id")
	ag.POST("/tiktok_channel", handler.CreateTikTokChannel)
	ag.GET("/tiktok_channel", handler.ListTikTokChannels)
	ig := ag.Group("/inboxes/:inbox_id/tiktok_channel")
	ig.GET("/:tt_id", handler.GetTikTokChannel)
	ig.PATCH("/:tt_id", handler.UpdateTikTokChannel)
	ig.DELETE("/:tt_id", handler.DeleteTikTokChannel)
	return r
}

// ── Create ──────────────────────────────────────────────────────

func TestTikTokChannel_Create_InvalidAccountID(t *testing.T) {
	handler, _ := setupTikTokHandlerTest(t)
	router := setupTikTokTestRouter(handler)

	body := CreateTikTokChannelRequest{
		Name:             "Bad Account",
		TikTokBusinessID: "tt_biz_bad",
		AccessToken:      "token",
	}
	b, _ := json.Marshal(body)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest(http.MethodPost, "/api/v1/accounts/invalid/tiktok_channel", bytes.NewReader(b))
	req.Header.Set("Content-Type", "application/json")
	router.ServeHTTP(w, req)

	assert.Equal(t, http.StatusBadRequest, w.Code)
	var resp map[string]interface{}
	require.NoError(t, json.Unmarshal(w.Body.Bytes(), &resp))
	assert.Equal(t, "invalid account_id", resp["error"])
}

func TestTikTokChannel_Create_InvalidRequestBody(t *testing.T) {
	handler, db := setupTikTokHandlerTest(t)
	router := setupTikTokTestRouter(handler)
	accountID := tikTokAccountID(db)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest(http.MethodPost, "/api/v1/accounts/"+accountID+"/tiktok_channel", bytes.NewReader([]byte("{bad json")))
	req.Header.Set("Content-Type", "application/json")
	router.ServeHTTP(w, req)

	assert.Equal(t, http.StatusBadRequest, w.Code)
}

// ── Get ──────────────────────────────────────────────────────────

func TestTikTokChannel_Get_Success(t *testing.T) {
	handler, db := setupTikTokHandlerTest(t)
	router := setupTikTokTestRouter(handler)
	accountID := tikTokAccountIDUint(db)

	// Seed a channel
	ch := &channelmodel.ChannelTikTok{
		TikTokBusinessID: "tt_get_123",
		AccessToken:      "access_token_get",
		AccountID:        accountID,
		InboxID:          500,
	}
	require.NoError(t, db.Create(ch).Error)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest(http.MethodGet, "/api/v1/accounts/"+strconv.FormatUint(uint64(accountID), 10)+"/inboxes/1/tiktok_channel/"+strconv.FormatUint(uint64(ch.ID), 10), nil)
	router.ServeHTTP(w, req)

	assert.Equal(t, http.StatusOK, w.Code)
	var resp map[string]interface{}
	require.NoError(t, json.Unmarshal(w.Body.Bytes(), &resp))
	assert.Equal(t, "tt_get_123", resp["tiktok_business_id"])
}

func TestTikTokChannel_Get_InvalidID(t *testing.T) {
	handler, db := setupTikTokHandlerTest(t)
	router := setupTikTokTestRouter(handler)
	accountID := tikTokAccountID(db)

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

	assert.Equal(t, http.StatusBadRequest, w.Code)
	var resp map[string]interface{}
	require.NoError(t, json.Unmarshal(w.Body.Bytes(), &resp))
	assert.Equal(t, "invalid tt_id", resp["error"])
}

func TestTikTokChannel_Get_NotFound(t *testing.T) {
	handler, db := setupTikTokHandlerTest(t)
	router := setupTikTokTestRouter(handler)
	accountID := tikTokAccountID(db)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest(http.MethodGet, "/api/v1/accounts/"+accountID+"/inboxes/1/tiktok_channel/99999", nil)
	router.ServeHTTP(w, req)

	assert.Equal(t, http.StatusNotFound, w.Code)
}

// ── Update ──────────────────────────────────────────────────────

func TestTikTokChannel_Update_Success(t *testing.T) {
	handler, db := setupTikTokHandlerTest(t)
	router := setupTikTokTestRouter(handler)
	accountID := tikTokAccountIDUint(db)

	// Seed a channel
	ch := &channelmodel.ChannelTikTok{
		TikTokBusinessID: "tt_upd_123",
		AccessToken:      "access_token_upd",
		AccountID:        accountID,
		InboxID:          501,
	}
	require.NoError(t, db.Create(ch).Error)

	body := UpdateTikTokChannelRequest{
		Name: "Updated TikTok Biz",
	}
	b, _ := json.Marshal(body)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest(http.MethodPatch, "/api/v1/accounts/"+strconv.FormatUint(uint64(accountID), 10)+"/inboxes/1/tiktok_channel/"+strconv.FormatUint(uint64(ch.ID), 10), bytes.NewReader(b))
	req.Header.Set("Content-Type", "application/json")
	router.ServeHTTP(w, req)

	assert.Equal(t, http.StatusOK, w.Code)
	var resp map[string]interface{}
	require.NoError(t, json.Unmarshal(w.Body.Bytes(), &resp))
	assert.Equal(t, "TikTok channel updated successfully", resp["message"])
}

func TestTikTokChannel_Update_WrongAccount(t *testing.T) {
	handler, db := setupTikTokHandlerTest(t)
	router := setupTikTokTestRouter(handler)
	accountID := tikTokAccountIDUint(db)

	// Seed a channel owned by a different account
	ch := &channelmodel.ChannelTikTok{
		TikTokBusinessID: "tt_other",
		AccessToken:      "token_other",
		AccountID:        accountID + 999,
		InboxID:          502,
	}
	require.NoError(t, db.Create(ch).Error)

	body := UpdateTikTokChannelRequest{
		Name: "Hacked Name",
	}
	b, _ := json.Marshal(body)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest(http.MethodPatch, "/api/v1/accounts/"+strconv.FormatUint(uint64(accountID), 10)+"/inboxes/1/tiktok_channel/"+strconv.FormatUint(uint64(ch.ID), 10), bytes.NewReader(b))
	req.Header.Set("Content-Type", "application/json")
	router.ServeHTTP(w, req)

	assert.Equal(t, http.StatusForbidden, w.Code)
}

func TestTikTokChannel_Update_InvalidTtID(t *testing.T) {
	handler, db := setupTikTokHandlerTest(t)
	router := setupTikTokTestRouter(handler)
	accountID := tikTokAccountID(db)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest(http.MethodPatch, "/api/v1/accounts/"+accountID+"/inboxes/1/tiktok_channel/invalid", bytes.NewReader([]byte("{}")))
	req.Header.Set("Content-Type", "application/json")
	router.ServeHTTP(w, req)

	assert.Equal(t, http.StatusBadRequest, w.Code)
}

// ── Delete ──────────────────────────────────────────────────────

func TestTikTokChannel_Delete_Success(t *testing.T) {
	handler, db := setupTikTokHandlerTest(t)
	router := setupTikTokTestRouter(handler)
	accountID := tikTokAccountIDUint(db)

	// Seed a channel
	ch := &channelmodel.ChannelTikTok{
		TikTokBusinessID: "tt_del_123",
		AccessToken:      "access_token_del",
		AccountID:        accountID,
		InboxID:          503,
	}
	require.NoError(t, db.Create(ch).Error)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest(http.MethodDelete, "/api/v1/accounts/"+strconv.FormatUint(uint64(accountID), 10)+"/inboxes/1/tiktok_channel/"+strconv.FormatUint(uint64(ch.ID), 10), nil)
	router.ServeHTTP(w, req)

	assert.Equal(t, http.StatusOK, w.Code)

	// Verify channel is soft-deleted
	var count int64
	db.Model(&channelmodel.ChannelTikTok{}).Where("id = ?", ch.ID).Count(&count)
	assert.Equal(t, int64(0), count)
}

func TestTikTokChannel_Delete_WrongAccount(t *testing.T) {
	handler, db := setupTikTokHandlerTest(t)
	router := setupTikTokTestRouter(handler)
	accountID := tikTokAccountIDUint(db)

	// Seed a channel owned by a different account
	ch := &channelmodel.ChannelTikTok{
		TikTokBusinessID: "tt_other_del",
		AccessToken:      "token_other_del",
		AccountID:        accountID + 999,
		InboxID:          504,
	}
	require.NoError(t, db.Create(ch).Error)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest(http.MethodDelete, "/api/v1/accounts/"+strconv.FormatUint(uint64(accountID), 10)+"/inboxes/1/tiktok_channel/"+strconv.FormatUint(uint64(ch.ID), 10), nil)
	router.ServeHTTP(w, req)

	assert.Equal(t, http.StatusForbidden, w.Code)
}

func TestTikTokChannel_Delete_NotFound(t *testing.T) {
	handler, db := setupTikTokHandlerTest(t)
	router := setupTikTokTestRouter(handler)
	accountID := tikTokAccountID(db)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest(http.MethodDelete, "/api/v1/accounts/"+accountID+"/inboxes/1/tiktok_channel/99999", nil)
	router.ServeHTTP(w, req)

	assert.Equal(t, http.StatusNotFound, w.Code)
}

// ── List ──────────────────────────────────────────────────────

func TestTikTokChannel_List_Success(t *testing.T) {
	handler, db := setupTikTokHandlerTest(t)
	router := setupTikTokTestRouter(handler)
	accountID := tikTokAccountIDUint(db)

	// Seed multiple channels
	for i := 0; i < 3; i++ {
		ch := &channelmodel.ChannelTikTok{
			TikTokBusinessID: "tt_list_" + strconv.Itoa(i),
			AccessToken:      "token_list_" + strconv.Itoa(i),
			AccountID:        accountID,
			InboxID:          uint(i + 600), // unique inbox IDs
		}
		require.NoError(t, db.Create(ch).Error)
	}

	w := httptest.NewRecorder()
	req, _ := http.NewRequest(http.MethodGet, "/api/v1/accounts/"+strconv.FormatUint(uint64(accountID), 10)+"/tiktok_channel", nil)
	router.ServeHTTP(w, req)

	assert.Equal(t, http.StatusOK, w.Code)
	var resp map[string]interface{}
	require.NoError(t, json.Unmarshal(w.Body.Bytes(), &resp))
	channels, ok := resp["channels"].([]interface{})
	require.True(t, ok)
	assert.Len(t, channels, 3)
}

func TestTikTokChannel_List_InvalidAccountID(t *testing.T) {
	handler, _ := setupTikTokHandlerTest(t)
	router := setupTikTokTestRouter(handler)

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

	assert.Equal(t, http.StatusBadRequest, w.Code)
}

func TestTikTokChannel_List_Empty(t *testing.T) {
	handler, db := setupTikTokHandlerTest(t)
	router := setupTikTokTestRouter(handler)
	accountID := tikTokAccountID(db)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest(http.MethodGet, "/api/v1/accounts/"+accountID+"/tiktok_channel", nil)
	router.ServeHTTP(w, req)

	assert.Equal(t, http.StatusOK, w.Code)
	var resp map[string]interface{}
	require.NoError(t, json.Unmarshal(w.Body.Bytes(), &resp))
	channels, ok := resp["channels"].([]interface{})
	require.True(t, ok)
	assert.Len(t, channels, 0)
}