package v1

import (
	"bytes"
	"encoding/json"
	"io"
	"net/http"
	"net/http/httptest"
	"strings"
	"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"

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

type slackHandlerRoundTripFunc func(*http.Request) (*http.Response, error)

func (f slackHandlerRoundTripFunc) RoundTrip(req *http.Request) (*http.Response, error) {
	return f(req)
}

func slackHandlerJSONResponse(body string) *http.Response {
	return &http.Response{StatusCode: http.StatusOK, Header: make(http.Header), Body: io.NopCloser(strings.NewReader(body))}
}

func setupSlackIntegrationRouter() *gin.Engine {
	gin.SetMode(gin.TestMode)
	r := gin.New()
	r.RedirectTrailingSlash = false

	handler := NewSlackIntegrationHandler(nil)

	integrations := r.Group("/api/v1/accounts/:account_id/integrations")
	RegisterSlackIntegrationRoutes(integrations, handler)

	return r
}

func setupSlackIntegrationRouterWithService(svc *service.SlackIntegrationService) *gin.Engine {
	gin.SetMode(gin.TestMode)
	r := gin.New()
	r.RedirectTrailingSlash = false

	handler := NewSlackIntegrationHandler(svc)
	integrations := r.Group("/api/v1/accounts/:account_id/integrations")
	RegisterSlackIntegrationRoutes(integrations, handler)
	return r
}

func setupSlackIntegrationHandlerDB(t *testing.T) (*gorm.DB, uint) {
	t.Helper()
	db, err := gorm.Open(sqlite.Open("file::memory:"), &gorm.Config{Logger: logger.Default.LogMode(logger.Silent)})
	require.NoError(t, err)
	require.NoError(t, db.AutoMigrate(&model.Account{}, &model.IntegrationHook{}))
	account := &model.Account{Name: "Slack Handler Account"}
	require.NoError(t, db.Create(account).Error)
	t.Cleanup(func() {
		sqlDB, _ := db.DB()
		_ = sqlDB.Close()
	})
	return db, account.ID
}

// ========================================
// SlackIntegration — param validation tests
// ========================================

func TestSlackIntegration_Create_BadAccountID(t *testing.T) {
	r := setupSlackIntegrationRouter()

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("POST", "/api/v1/accounts/abc/integrations/slack/", nil)
	r.ServeHTTP(w, req)

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

	var resp map[string]interface{}
	json.Unmarshal(w.Body.Bytes(), &resp)
	errBody := resp["error"].(map[string]interface{})
	assert.Contains(t, errBody["message"], "invalid account_id")
}

func TestSlackIntegration_Create_InvalidJSON(t *testing.T) {
	r := setupSlackIntegrationRouter()

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("POST", "/api/v1/accounts/1/integrations/slack/", bytes.NewReader([]byte("invalid json")))
	req.Header.Set("Content-Type", "application/json")
	r.ServeHTTP(w, req)

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

	var resp map[string]interface{}
	json.Unmarshal(w.Body.Bytes(), &resp)
	assert.False(t, resp["success"].(bool))
}

func TestSlackIntegration_Update_BadAccountID(t *testing.T) {
	r := setupSlackIntegrationRouter()

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("PATCH", "/api/v1/accounts/abc/integrations/slack/", nil)
	r.ServeHTTP(w, req)

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

	var resp map[string]interface{}
	json.Unmarshal(w.Body.Bytes(), &resp)
	errBody := resp["error"].(map[string]interface{})
	assert.Contains(t, errBody["message"], "invalid account_id")
}

func TestSlackIntegration_Update_InvalidJSON(t *testing.T) {
	r := setupSlackIntegrationRouter()

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("PATCH", "/api/v1/accounts/1/integrations/slack/", bytes.NewReader([]byte("invalid json")))
	req.Header.Set("Content-Type", "application/json")
	r.ServeHTTP(w, req)

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

	var resp map[string]interface{}
	json.Unmarshal(w.Body.Bytes(), &resp)
	assert.False(t, resp["success"].(bool))
}

func TestSlackIntegration_Delete_BadAccountID(t *testing.T) {
	r := setupSlackIntegrationRouter()

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("DELETE", "/api/v1/accounts/abc/integrations/slack/", nil)
	r.ServeHTTP(w, req)

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

	var resp map[string]interface{}
	json.Unmarshal(w.Body.Bytes(), &resp)
	errBody := resp["error"].(map[string]interface{})
	assert.Contains(t, errBody["message"], "invalid account_id")
}

func TestSlackIntegration_ListAllChannels_BadAccountID(t *testing.T) {
	r := setupSlackIntegrationRouter()

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("GET", "/api/v1/accounts/abc/integrations/slack/list_all_channels", nil)
	r.ServeHTTP(w, req)

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

	var resp map[string]interface{}
	json.Unmarshal(w.Body.Bytes(), &resp)
	errBody := resp["error"].(map[string]interface{})
	assert.Contains(t, errBody["message"], "invalid account_id")
}

func TestSlackIntegration_Create_NoTrailingSlash_ReturnsRawAppPayload(t *testing.T) {
	db, accountID := setupSlackIntegrationHandlerDB(t)
	svc := service.NewSlackIntegrationService(repository.NewIntegrationHookRepo(db))
	r := setupSlackIntegrationRouterWithService(svc)

	w := httptest.NewRecorder()
	body := bytes.NewReader([]byte(`{"slack_token":"xoxb-handler-token"}`))
	req, _ := http.NewRequest("POST", "/api/v1/accounts/1/integrations/slack", body)
	req.Header.Set("Content-Type", "application/json")
	r.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, "slack", resp["id"])
	assert.NotContains(t, resp, "success")
	hooks := resp["hooks"].([]interface{})
	require.Len(t, hooks, 1)
	hook := hooks[0].(map[string]interface{})
	assert.Equal(t, "slack", hook["app_id"])
	assert.Equal(t, accountID, uint(hook["account_id"].(float64)))
	assert.Equal(t, false, hook["status"])
}

func TestSlackIntegration_Delete_NoTrailingSlash_ReturnsEmptyOK(t *testing.T) {
	db, accountID := setupSlackIntegrationHandlerDB(t)
	require.NoError(t, db.Create(&model.IntegrationHook{AccountID: accountID, AppID: "slack", HookType: model.HookTypeSlack}).Error)
	svc := service.NewSlackIntegrationService(repository.NewIntegrationHookRepo(db))
	r := setupSlackIntegrationRouterWithService(svc)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("DELETE", "/api/v1/accounts/1/integrations/slack", nil)
	r.ServeHTTP(w, req)

	assert.Equal(t, http.StatusOK, w.Code)
	assert.Empty(t, w.Body.String())
}

func TestSlackIntegration_ListAllChannels_NoTrailingSlash_ReturnsChannelArray(t *testing.T) {
	db, accountID := setupSlackIntegrationHandlerDB(t)
	require.NoError(t, db.Create(&model.IntegrationHook{AccountID: accountID, AppID: "slack", HookType: model.HookTypeSlack, AccessToken: "xoxb-handler-token"}).Error)
	svc := service.NewSlackIntegrationService(repository.NewIntegrationHookRepo(db), service.WithSlackHTTPClient("https://slack.test/api", &http.Client{Transport: slackHandlerRoundTripFunc(func(req *http.Request) (*http.Response, error) {
		require.Equal(t, "/api/conversations.list", req.URL.Path)
		require.Equal(t, "Bearer xoxb-handler-token", req.Header.Get("Authorization"))
		if req.URL.Query().Get("types") == "private_channel" {
			return slackHandlerJSONResponse(`{"ok":true,"channels":[{"id":"G1","name":"private-room","is_private":true}],"response_metadata":{"next_cursor":""}}`), nil
		}
		return slackHandlerJSONResponse(`{"ok":true,"channels":[{"id":"C1","name":"support","is_private":false}],"response_metadata":{"next_cursor":""}}`), nil
	})}))
	r := setupSlackIntegrationRouterWithService(svc)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("GET", "/api/v1/accounts/1/integrations/slack/list_all_channels", nil)
	r.ServeHTTP(w, req)

	assert.Equal(t, http.StatusOK, w.Code)
	var resp []map[string]interface{}
	require.NoError(t, json.Unmarshal(w.Body.Bytes(), &resp))
	require.Len(t, resp, 2)
	assert.Equal(t, "G1", resp[0]["id"])
	assert.Equal(t, "private-room", resp[0]["name"])
	assert.Equal(t, true, resp[0]["is_private"])
	assert.Equal(t, "C1", resp[1]["id"])
	assert.Equal(t, "support", resp[1]["name"])
	assert.Equal(t, false, resp[1]["is_private"])
}

func TestSlackIntegration_Update_PutNoTrailingSlash_BadAccountID(t *testing.T) {
	r := setupSlackIntegrationRouter()

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("PUT", "/api/v1/accounts/abc/integrations/slack", nil)
	r.ServeHTTP(w, req)

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