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.ContactLabel{}, &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 labelBoolPtr(v bool) *bool { return &v }

func (s *LabelHandlerTestSuite) SetupTest() {
	s.Require().NoError(s.db.Exec("DELETE FROM conversation_labels").Error)
	s.Require().NoError(s.db.Exec("DELETE FROM contact_labels").Error)
	s.Require().NoError(s.db.Unscoped().Where("account_id = ?", s.account.ID).Delete(&model.Tag{}).Error)
}

func (s *LabelHandlerTestSuite) TestListTags_Success() {
	r := gin.New()
	r.GET("/api/v1/accounts/:account_id/tags", s.handler.ListTags)
	s.Require().NoError(s.db.Create(&model.Tag{AccountID: s.account.ID, Name: "billing", Color: "#ff0000", Description: "Billing issues", ShowOnSidebar: labelBoolPtr(true)}).Error)

	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)
	var resp map[string][]map[string]interface{}
	s.Require().NoError(json.Unmarshal(w.Body.Bytes(), &resp))
	s.Require().Len(resp["payload"], 1)
	assert.Equal(s.T(), "billing", resp["payload"][0]["title"])
	assert.Equal(s.T(), "Billing issues", resp["payload"][0]["description"])
	assert.Equal(s.T(), "#ff0000", resp["payload"][0]["color"])
	assert.Equal(s.T(), true, resp["payload"][0]["show_on_sidebar"])
}

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/labels", s.handler.CreateTag)

	body := map[string]interface{}{"label": map[string]interface{}{"title": "Priority", "description": "Hot queue", "color": "#FF0000", "show_on_sidebar": false}}
	b, _ := json.Marshal(body)

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

	assert.Equal(s.T(), http.StatusOK, w.Code)
	var resp map[string]interface{}
	s.Require().NoError(json.Unmarshal(w.Body.Bytes(), &resp))
	assert.Equal(s.T(), "priority", resp["title"])
	assert.Equal(s.T(), "Hot queue", resp["description"])
	assert.Equal(s.T(), "#FF0000", resp["color"])
	assert.Equal(s.T(), false, resp["show_on_sidebar"])
}

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

	body := map[string]interface{}{"name": "legacy", "color": ""}
	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.StatusOK, w.Code)
	var resp map[string]interface{}
	s.Require().NoError(json.Unmarshal(w.Body.Bytes(), &resp))
	assert.Equal(s.T(), "legacy", resp["title"])
	assert.Equal(s.T(), "#1f93ff", resp["color"])
	assert.Equal(s.T(), true, resp["show_on_sidebar"])
}

func (s *LabelHandlerTestSuite) TestUpdateTag_ChatwootPayloadAndAccountScope() {
	r := gin.New()
	r.PUT("/api/v1/accounts/:account_id/labels/:tag_id", s.handler.UpdateTag)
	tag := &model.Tag{AccountID: s.account.ID, Name: "old", Color: "#000000", ShowOnSidebar: labelBoolPtr(true)}
	s.Require().NoError(s.db.Create(tag).Error)

	desc := "New description"
	color := "#00ff00"
	show := false
	body := map[string]interface{}{"label": map[string]interface{}{"title": "New", "description": desc, "color": color, "show_on_sidebar": show}}
	b, _ := json.Marshal(body)

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

	assert.Equal(s.T(), http.StatusOK, w.Code)
	var resp map[string]interface{}
	s.Require().NoError(json.Unmarshal(w.Body.Bytes(), &resp))
	assert.Equal(s.T(), "new", resp["title"])
	assert.Equal(s.T(), desc, resp["description"])
	assert.Equal(s.T(), color, resp["color"])
	assert.Equal(s.T(), show, resp["show_on_sidebar"])
}

func (s *LabelHandlerTestSuite) TestDeleteTag_ReturnsOKAndRemovesAssociations() {
	r := gin.New()
	r.DELETE("/api/v1/accounts/:account_id/labels/:tag_id", s.handler.DeleteTag)
	tag := &model.Tag{AccountID: s.account.ID, Name: "old", Color: "#000000", ShowOnSidebar: labelBoolPtr(true)}
	s.Require().NoError(s.db.Create(tag).Error)
	s.Require().NoError(s.db.Create(&model.ConversationLabel{AccountID: s.account.ID, ConversationID: 10, TagID: tag.ID}).Error)
	s.Require().NoError(s.db.Create(&model.ContactLabel{AccountID: s.account.ID, ContactID: 20, TagID: tag.ID}).Error)

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

	assert.Equal(s.T(), http.StatusOK, w.Code)
	var convCount int64
	s.Require().NoError(s.db.Model(&model.ConversationLabel{}).Where("tag_id = ?", tag.ID).Count(&convCount).Error)
	assert.Equal(s.T(), int64(0), convCount)
	var contactCount int64
	s.Require().NoError(s.db.Model(&model.ContactLabel{}).Where("tag_id = ?", tag.ID).Count(&contactCount).Error)
	assert.Equal(s.T(), int64(0), contactCount)
}

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)
}