package v1

import (
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"

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

	"github.com/gochat/gochat/internal/canned"
)

// mockDBProvider implements canned.DBProvider for validation-only tests.
// DB() returns nil — service methods are never reached since validation fails first.
type mockDBProvider struct{}

func (m *mockDBProvider) DB() *gorm.DB { return nil }

func setupCannedResponseRouter(handler *CannedResponseHandler) *gin.Engine {
	gin.SetMode(gin.TestMode)
	r := gin.New()
	r.POST("/api/v1/accounts/:account_id/canned_responses", handler.Create)
	r.GET("/api/v1/accounts/:account_id/canned_responses/:id", handler.Get)
	r.PUT("/api/v1/accounts/:account_id/canned_responses/:id", handler.Update)
	r.DELETE("/api/v1/accounts/:account_id/canned_responses/:id", handler.Delete)
	r.GET("/api/v1/accounts/:account_id/canned_responses", handler.List)
	r.GET("/api/v1/accounts/:account_id/canned_responses/search", handler.Search)
	return r
}

func newTestCannedResponseHandler() *CannedResponseHandler {
	svc := canned.NewCannedResponseService(&mockDBProvider{})
	return NewCannedResponseHandler(svc)
}

func TestCannedResponseGet_InvalidID(t *testing.T) {
	handler := newTestCannedResponseHandler()
	router := setupCannedResponseRouter(handler)

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

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

func TestCannedResponseCreate_InvalidJSON(t *testing.T) {
	handler := newTestCannedResponseHandler()
	router := setupCannedResponseRouter(handler)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("POST", "/api/v1/accounts/1/canned_responses", strings.NewReader("{invalid}"))
	req.Header.Set("Content-Type", "application/json")
	router.ServeHTTP(w, req)

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

func TestCannedResponseCreate_MissingShortCode(t *testing.T) {
	handler := newTestCannedResponseHandler()
	router := setupCannedResponseRouter(handler)

	body := `{"content":"hello world"}`
	w := httptest.NewRecorder()
	req, _ := http.NewRequest("POST", "/api/v1/accounts/1/canned_responses", strings.NewReader(body))
	req.Header.Set("Content-Type", "application/json")
	router.ServeHTTP(w, req)

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

func TestCannedResponseCreate_MissingContent(t *testing.T) {
	handler := newTestCannedResponseHandler()
	router := setupCannedResponseRouter(handler)

	body := `{"short_code":"greeting"}`
	w := httptest.NewRecorder()
	req, _ := http.NewRequest("POST", "/api/v1/accounts/1/canned_responses", strings.NewReader(body))
	req.Header.Set("Content-Type", "application/json")
	router.ServeHTTP(w, req)

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

func TestCannedResponseUpdate_InvalidID(t *testing.T) {
	handler := newTestCannedResponseHandler()
	router := setupCannedResponseRouter(handler)

	body := `{"short_code":"greeting","content":"hello"}`
	w := httptest.NewRecorder()
	req, _ := http.NewRequest("PUT", "/api/v1/accounts/1/canned_responses/xyz", strings.NewReader(body))
	req.Header.Set("Content-Type", "application/json")
	router.ServeHTTP(w, req)

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

func TestCannedResponseUpdate_InvalidJSON(t *testing.T) {
	handler := newTestCannedResponseHandler()
	router := setupCannedResponseRouter(handler)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("PUT", "/api/v1/accounts/1/canned_responses/1", strings.NewReader("{invalid}"))
	req.Header.Set("Content-Type", "application/json")
	router.ServeHTTP(w, req)

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

func TestCannedResponseDelete_InvalidID(t *testing.T) {
	handler := newTestCannedResponseHandler()
	router := setupCannedResponseRouter(handler)

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

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