package v1

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

	"github.com/gin-gonic/gin"
	"github.com/gochat/gochat/internal/model"
	"github.com/gochat/gochat/internal/repository"
	"github.com/gochat/gochat/internal/service"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/suite"
	"gorm.io/driver/sqlite"
	"gorm.io/gorm"
	"gorm.io/gorm/logger"
)

type LabelHandlerTestSuite struct {
	suite.Suite
	db      *gorm.DB
	handler *LabelHandler

	account *model.Account
}

func (s *LabelHandlerTestSuite) SetupSuite() {
	gin.SetMode(gin.TestMode)
	db, err := gorm.Open(sqlite.Open("file::memory:"), &gorm.Config{
		Logger: logger.Default.LogMode(logger.Silent),
	})
	s.Require().NoError(err)
	s.Require().NoError(db.AutoMigrate(&model.Account{}, &model.User{}, &model.Tag{}, &model.ConversationLabel{}, &model.Conversation{}, &model.Inbox{}, &model.Contact{}))
	s.db = db

	convLabelRepo := repository.NewConversationLabelRepo(db)
	tagRepo := repository.NewTagRepo(db)
	tagSvc := service.NewTagService(tagRepo)
	labelSvc := service.NewLabelService(convLabelRepo, tagRepo)
	s.handler = NewLabelHandler(tagSvc, labelSvc)

	s.account = &model.Account{Name: "test-label-account"}
	s.Require().NoError(db.Create(s.account).Error)
}

func (s *LabelHandlerTestSuite) TearDownSuite() {
	if s.db != nil {
		sqlDB, _ := s.db.DB()
		sqlDB.Close()
	}
}

func TestLabelHandlerSuite(t *testing.T) {
	suite.Run(t, new(LabelHandlerTestSuite))
}

func (s *LabelHandlerTestSuite) TestListTags_Success() {
	r := gin.New()
	r.GET("/api/v1/accounts/:account_id/tags", s.handler.ListTags)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("GET", fmt.Sprintf("/api/v1/accounts/%d/tags", s.account.ID), nil)
	r.ServeHTTP(w, req)

	assert.Equal(s.T(), http.StatusOK, w.Code)
}

func (s *LabelHandlerTestSuite) TestCreateTag_BadRequest_EmptyBody() {
	r := gin.New()
	r.POST("/api/v1/accounts/:account_id/tags", s.handler.CreateTag)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("POST", fmt.Sprintf("/api/v1/accounts/%d/tags", s.account.ID), nil)
	req.Header.Set("Content-Type", "application/json")
	r.ServeHTTP(w, req)

	assert.Equal(s.T(), http.StatusBadRequest, w.Code)
}

func (s *LabelHandlerTestSuite) TestCreateTag_Success() {
	r := gin.New()
	r.POST("/api/v1/accounts/:account_id/tags", s.handler.CreateTag)

	body := map[string]interface{}{"name": "priority", "color": "#FF0000"}
	b, _ := json.Marshal(body)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("POST", fmt.Sprintf("/api/v1/accounts/%d/tags", s.account.ID), bytes.NewBuffer(b))
	req.Header.Set("Content-Type", "application/json")
	r.ServeHTTP(w, req)

	assert.Equal(s.T(), http.StatusCreated, w.Code)
}

func (s *LabelHandlerTestSuite) TestGetTag_BadRequest_InvalidID() {
	r := gin.New()
	r.GET("/api/v1/accounts/:account_id/tags/:tag_id", s.handler.GetTag)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("GET", fmt.Sprintf("/api/v1/accounts/%d/tags/abc", s.account.ID), nil)
	r.ServeHTTP(w, req)

	assert.Equal(s.T(), http.StatusBadRequest, w.Code)
}

func (s *LabelHandlerTestSuite) TestGetTag_NotFound() {
	r := gin.New()
	r.GET("/api/v1/accounts/:account_id/tags/:tag_id", s.handler.GetTag)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("GET", fmt.Sprintf("/api/v1/accounts/%d/tags/99999", s.account.ID), nil)
	r.ServeHTTP(w, req)

	assert.Equal(s.T(), http.StatusNotFound, w.Code)
}

func (s *LabelHandlerTestSuite) TestUpdateTag_BadRequest_InvalidID() {
	r := gin.New()
	r.PUT("/api/v1/accounts/:account_id/tags/:tag_id", s.handler.UpdateTag)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("PUT", fmt.Sprintf("/api/v1/accounts/%d/tags/abc", s.account.ID), nil)
	req.Header.Set("Content-Type", "application/json")
	r.ServeHTTP(w, req)

	assert.Equal(s.T(), http.StatusBadRequest, w.Code)
}

func (s *LabelHandlerTestSuite) TestDeleteTag_BadRequest_InvalidID() {
	r := gin.New()
	r.DELETE("/api/v1/accounts/:account_id/tags/:tag_id", s.handler.DeleteTag)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("DELETE", fmt.Sprintf("/api/v1/accounts/%d/tags/abc", s.account.ID), nil)
	r.ServeHTTP(w, req)

	assert.Equal(s.T(), http.StatusBadRequest, w.Code)
}

func (s *LabelHandlerTestSuite) TestAddLabelToConversation_BadRequest_InvalidConvID() {
	r := gin.New()
	r.POST("/api/v1/accounts/:account_id/conversations/:conversation_id/labels", s.handler.AddLabelToConversation)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("POST", fmt.Sprintf("/api/v1/accounts/%d/conversations/abc/labels", s.account.ID), nil)
	req.Header.Set("Content-Type", "application/json")
	r.ServeHTTP(w, req)

	assert.Equal(s.T(), http.StatusBadRequest, w.Code)
}

func (s *LabelHandlerTestSuite) TestRemoveLabelFromConversation_BadRequest_InvalidIDs() {
	r := gin.New()
	r.DELETE("/api/v1/accounts/:account_id/conversations/:conversation_id/labels/:tag_id", s.handler.RemoveLabelFromConversation)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("DELETE", fmt.Sprintf("/api/v1/accounts/%d/conversations/abc/labels/1", s.account.ID), nil)
	r.ServeHTTP(w, req)

	assert.Equal(s.T(), http.StatusBadRequest, w.Code)
}

func (s *LabelHandlerTestSuite) TestGetConversationLabels_BadRequest_InvalidConvID() {
	r := gin.New()
	r.GET("/api/v1/accounts/:account_id/conversations/:conversation_id/labels", s.handler.GetConversationLabels)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("GET", fmt.Sprintf("/api/v1/accounts/%d/conversations/abc/labels", s.account.ID), nil)
	r.ServeHTTP(w, req)

	assert.Equal(s.T(), http.StatusBadRequest, w.Code)
}

func (s *LabelHandlerTestSuite) TestBatchAddLabel_BadRequest_InvalidAccountID() {
	r := gin.New()
	r.POST("/api/v1/accounts/:account_id/conversations/batch_labels/add", s.handler.BatchAddLabel)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("POST", "/api/v1/accounts/abc/conversations/batch_labels/add", nil)
	req.Header.Set("Content-Type", "application/json")
	r.ServeHTTP(w, req)

	assert.Equal(s.T(), http.StatusBadRequest, w.Code)
}

func (s *LabelHandlerTestSuite) TestBatchRemoveLabel_BadRequest_InvalidAccountID() {
	r := gin.New()
	r.POST("/api/v1/accounts/:account_id/conversations/batch_labels/remove", s.handler.BatchRemoveLabel)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("POST", "/api/v1/accounts/abc/conversations/batch_labels/remove", nil)
	req.Header.Set("Content-Type", "application/json")
	r.ServeHTTP(w, req)

	assert.Equal(s.T(), http.StatusBadRequest, w.Code)
}