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"

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

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

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

func setupTwilioHandlerTest(t *testing.T) (*TwilioChannelHandler, *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.ChannelTwilioSMS{},
	))
	t.Cleanup(func() {
		sqlDB, _ := db.DB()
		sqlDB.Close()
	})

	twRepo := repository.NewChannelTwilioSMSRepo(db)
	twChannelSvc := service.NewChannelTwilioSMSService(twRepo)

	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 := NewTwilioChannelHandler(twChannelSvc, inboxSvc, twRepo)

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

	return handler, db
}

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

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

func setupTwilioTestRouter(handler *TwilioChannelHandler) *gin.Engine {
	gin.SetMode(gin.TestMode)
	r := gin.New()
	ag := r.Group("/api/v1/accounts/:id")
	ag.POST("/channels/twilio_channel", handler.Create)
	ag.POST("/twilio_sms_channels", handler.Create)
	ag.GET("/twilio_sms_channels", handler.List)
	ig := ag.Group("/inboxes/:inbox_id/twilio_sms_channels")
	ig.GET("/:tw_id", handler.Get)
	ig.PATCH("/:tw_id", handler.Update)
	ig.DELETE("/:tw_id", handler.Delete)
	return r
}

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

func TestTwilioChannel_Create_Success(t *testing.T) {
	handler, db := setupTwilioHandlerTest(t)
	router := setupTwilioTestRouter(handler)
	accountID := twilioAccountID(db)

	body := map[string]any{
		"twilio_channel": map[string]any{
			"account_sid":           "ACtest123",
			"api_key_sid":           "SKtest123",
			"auth_token":            "authtoken_secret",
			"phone_number":          "+15551234567",
			"messaging_service_sid": "MG123",
			"medium":                "sms",
			"name":                  "Support SMS",
		},
	}
	b, _ := json.Marshal(body)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest(http.MethodPost, "/api/v1/accounts/"+accountID+"/channels/twilio_channel", 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, "Support SMS", resp["name"])
	assert.Equal(t, "Channel::TwilioSms", resp["channel_type"])
	assert.Equal(t, "ACtest123", resp["account_sid"])
	assert.Equal(t, "SKtest123", resp["api_key_sid"])
	assert.Equal(t, "+15551234567", resp["phone_number"])
	assert.Equal(t, "MG123", resp["messaging_service_sid"])
	assert.Equal(t, "sms", resp["medium"])
	require.NotContains(t, resp, "channel")
	require.NotContains(t, resp, "inbox")
}

func TestTwilioChannel_Create_InvalidAccountID(t *testing.T) {
	handler, _ := setupTwilioHandlerTest(t)
	router := setupTwilioTestRouter(handler)

	body := CreateTwilioSMSChannelRequest{
		AccountSID:  "ACtest123",
		PhoneNumber: "+15551234567",
	}
	b, _ := json.Marshal(body)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest(http.MethodPost, "/api/v1/accounts/invalid/twilio_sms_channels", 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 TestTwilioChannel_Create_InvalidRequestBody(t *testing.T) {
	handler, db := setupTwilioHandlerTest(t)
	router := setupTwilioTestRouter(handler)
	accountID := twilioAccountID(db)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest(http.MethodPost, "/api/v1/accounts/"+accountID+"/twilio_sms_channels", 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 TestTwilioChannel_Get_Success(t *testing.T) {
	handler, db := setupTwilioHandlerTest(t)
	router := setupTwilioTestRouter(handler)
	accountID := twilioAccountIDUint(db)

	// Seed a channel and its associated inbox.
	ch := &channelmodel.ChannelTwilioSMS{
		AccountSID:  "ACget123",
		PhoneNumber: "+15559999999",
		AccountID:   accountID,
	}
	require.NoError(t, db.Create(ch).Error)
	inbox := createTestChannelInbox(t, db, accountID, ch.ID, "Get SMS", "twilio_sms", map[string]any{
		"account_sid":  "ACget123",
		"phone_number": "+15559999999",
		"medium":       "sms",
	})
	ch.InboxID = inbox.ID
	require.NoError(t, db.Save(ch).Error)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest(http.MethodGet, "/api/v1/accounts/"+strconv.FormatUint(uint64(accountID), 10)+"/inboxes/1/twilio_sms_channels/"+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, "Get SMS", resp["name"])
	assert.Equal(t, "Channel::TwilioSms", resp["channel_type"])
	assert.Equal(t, "ACget123", resp["account_sid"])
	require.NotContains(t, resp, "channel")
}

func TestTwilioChannel_Get_InvalidID(t *testing.T) {
	handler, db := setupTwilioHandlerTest(t)
	router := setupTwilioTestRouter(handler)
	accountID := twilioAccountID(db)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest(http.MethodGet, "/api/v1/accounts/"+accountID+"/inboxes/1/twilio_sms_channels/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 tw_id", resp["error"])
}

func TestTwilioChannel_Get_NotFound(t *testing.T) {
	handler, db := setupTwilioHandlerTest(t)
	router := setupTwilioTestRouter(handler)
	accountID := twilioAccountID(db)

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

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

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

func TestTwilioChannel_Update_Success(t *testing.T) {
	handler, db := setupTwilioHandlerTest(t)
	router := setupTwilioTestRouter(handler)
	accountID := twilioAccountIDUint(db)

	// Seed a channel and its associated inbox.
	ch := &channelmodel.ChannelTwilioSMS{
		AccountSID:  "ACupd123",
		PhoneNumber: "+15558888888",
		AccountID:   accountID,
	}
	require.NoError(t, db.Create(ch).Error)
	inbox := createTestChannelInbox(t, db, accountID, ch.ID, "Update SMS", "twilio_sms", map[string]any{
		"account_sid":  "ACupd123",
		"phone_number": "+15558888888",
		"medium":       "sms",
	})
	ch.InboxID = inbox.ID
	require.NoError(t, db.Save(ch).Error)

	newPhone := "+15557777777"
	body := UpdateTwilioSMSChannelRequest{
		PhoneNumber: &newPhone,
	}
	b, _ := json.Marshal(body)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest(http.MethodPatch, "/api/v1/accounts/"+strconv.FormatUint(uint64(accountID), 10)+"/inboxes/1/twilio_sms_channels/"+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, "+15557777777", resp["phone_number"])
}

func TestTwilioChannel_Update_WrongAccount(t *testing.T) {
	handler, db := setupTwilioHandlerTest(t)
	router := setupTwilioTestRouter(handler)
	accountID := twilioAccountIDUint(db)

	// Seed a channel owned by a different account
	ch := &channelmodel.ChannelTwilioSMS{
		AccountSID:  "ACother",
		PhoneNumber: "+15556666666",
		AccountID:   accountID + 999, // different account
		InboxID:     202,
	}
	require.NoError(t, db.Create(ch).Error)

	newPhone := "+15551111111"
	body := UpdateTwilioSMSChannelRequest{
		PhoneNumber: &newPhone,
	}
	b, _ := json.Marshal(body)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest(http.MethodPatch, "/api/v1/accounts/"+strconv.FormatUint(uint64(accountID), 10)+"/inboxes/1/twilio_sms_channels/"+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 TestTwilioChannel_Update_InvalidTwID(t *testing.T) {
	handler, db := setupTwilioHandlerTest(t)
	router := setupTwilioTestRouter(handler)
	accountID := twilioAccountID(db)

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

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

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

func TestTwilioChannel_Delete_Success(t *testing.T) {
	handler, db := setupTwilioHandlerTest(t)
	router := setupTwilioTestRouter(handler)
	accountID := twilioAccountIDUint(db)

	// Seed a channel
	ch := &channelmodel.ChannelTwilioSMS{
		AccountSID:  "ACdel123",
		PhoneNumber: "+15555555555",
		AccountID:   accountID,
		InboxID:     203,
	}
	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/twilio_sms_channels/"+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.ChannelTwilioSMS{}).Where("id = ?", ch.ID).Count(&count)
	assert.Equal(t, int64(0), count)
}

func TestTwilioChannel_Delete_WrongAccount(t *testing.T) {
	handler, db := setupTwilioHandlerTest(t)
	router := setupTwilioTestRouter(handler)
	accountID := twilioAccountIDUint(db)

	// Seed a channel owned by a different account
	ch := &channelmodel.ChannelTwilioSMS{
		AccountSID:  "ACother2",
		PhoneNumber: "+15554444444",
		AccountID:   accountID + 999,
		InboxID:     204,
	}
	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/twilio_sms_channels/"+strconv.FormatUint(uint64(ch.ID), 10), nil)
	router.ServeHTTP(w, req)

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

func TestTwilioChannel_Delete_NotFound(t *testing.T) {
	handler, db := setupTwilioHandlerTest(t)
	router := setupTwilioTestRouter(handler)
	accountID := twilioAccountID(db)

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

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

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

func TestTwilioChannel_List_Success(t *testing.T) {
	handler, db := setupTwilioHandlerTest(t)
	router := setupTwilioTestRouter(handler)
	accountID := twilioAccountIDUint(db)

	// Seed multiple channels and their associated inboxes.
	for i := 0; i < 3; i++ {
		ch := &channelmodel.ChannelTwilioSMS{
			AccountSID:  "AClist" + strconv.Itoa(i),
			PhoneNumber: "+1555" + strconv.Itoa(i) + "00000",
			AccountID:   accountID,
		}
		require.NoError(t, db.Create(ch).Error)
		inbox := createTestChannelInbox(t, db, accountID, ch.ID, "SMS List "+strconv.Itoa(i), "twilio_sms", map[string]any{
			"account_sid":  ch.AccountSID,
			"phone_number": ch.PhoneNumber,
			"medium":       "sms",
		})
		ch.InboxID = inbox.ID
		require.NoError(t, db.Save(ch).Error)
	}

	w := httptest.NewRecorder()
	req, _ := http.NewRequest(http.MethodGet, "/api/v1/accounts/"+strconv.FormatUint(uint64(accountID), 10)+"/twilio_sms_channels", 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["payload"].([]interface{})
	require.True(t, ok)
	assert.Len(t, channels, 3)
}

func TestTwilioChannel_List_InvalidAccountID(t *testing.T) {
	handler, _ := setupTwilioHandlerTest(t)
	router := setupTwilioTestRouter(handler)

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

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

func TestTwilioChannel_List_Empty(t *testing.T) {
	handler, db := setupTwilioHandlerTest(t)
	router := setupTwilioTestRouter(handler)
	accountID := twilioAccountID(db)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest(http.MethodGet, "/api/v1/accounts/"+accountID+"/twilio_sms_channels", 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["payload"].([]interface{})
	require.True(t, ok)
	assert.Len(t, channels, 0)
}