package v1

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

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

type CsatSurveyHandlerTestSuite struct {
	suite.Suite
	db      *gorm.DB
	handler *CsatSurveyHandler
	account *model.Account
}

type csatSurveyTestDBProvider struct {
	db *gorm.DB
}

func (p *csatSurveyTestDBProvider) DB() *gorm.DB {
	return p.db
}

func (s *CsatSurveyHandlerTestSuite) 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.AccountUser{},
		&model.Inbox{},
		&model.Contact{},
		&model.Conversation{},
		&model.Message{},
		&automation.CsatSurveyResponse{},
		&model.ReportingEventsRollup{},
	))
	s.db = db

	svc := automation.NewCsatSurveyService(&csatSurveyTestDBProvider{db: db})
	s.handler = NewCsatSurveyHandler(svc)

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

func (s *CsatSurveyHandlerTestSuite) SetupTest() {
	s.db.Exec("DELETE FROM csat_survey_responses")
	s.db.Exec("DELETE FROM messages")
	s.db.Exec("DELETE FROM conversations")
	s.db.Exec("DELETE FROM contacts")
	s.db.Exec("DELETE FROM inboxes")
	s.db.Exec("DELETE FROM account_users")
	s.db.Exec("DELETE FROM users")
}

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

func TestCsatSurveyHandlerSuite(t *testing.T) {
	suite.Run(t, new(CsatSurveyHandlerTestSuite))
}

func (s *CsatSurveyHandlerTestSuite) TestList_Success() {
	r := gin.New()
	r.GET("/api/v1/accounts/:account_id/csats", s.handler.List)

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

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

func (s *CsatSurveyHandlerTestSuite) TestMetrics_Success() {
	r := gin.New()
	r.GET("/api/v1/accounts/:account_id/csat_metrics", s.handler.Metrics)

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

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

func (s *CsatSurveyHandlerTestSuite) TestList_ChatwootPayloadAndFilters() {
	createdAt := time.Now().Add(-2 * time.Hour).Truncate(time.Second)
	agent, reviewer, contact, conversation, message := s.seedAccountCsatResponseGraph(createdAt, 5)
	otherContact := &model.Contact{AccountID: s.account.ID, Name: "Other Contact"}
	s.Require().NoError(s.db.Create(otherContact).Error)
	otherInbox := &model.Inbox{AccountID: s.account.ID, Name: "Other Inbox", ChannelType: "web_widget", Enabled: true}
	s.Require().NoError(s.db.Create(otherInbox).Error)
	otherConversation := &model.Conversation{AccountID: s.account.ID, InboxID: otherInbox.ID, ContactID: otherContact.ID, Status: "resolved", ChannelType: "web_widget", Channel: "web_widget"}
	s.Require().NoError(s.db.Create(otherConversation).Error)
	s.Require().NoError(s.db.Create(&automation.CsatSurveyResponse{AccountID: s.account.ID, ConversationID: otherConversation.ID, ContactID: otherContact.ID, Rating: 3}).Error)

	r := gin.New()
	r.GET("/api/v1/accounts/:account_id/csat_survey_responses", s.handler.List)

	teamID := *conversation.TeamID
	url := fmt.Sprintf("/api/v1/accounts/%d/csat_survey_responses?since=%d&until=%d&user_ids=%d&inbox_id=%d&team_id=%d&rating=5",
		s.account.ID, createdAt.Add(-time.Hour).Unix(), createdAt.Add(time.Hour).Unix(), agent.ID, conversation.InboxID, teamID)
	w := httptest.NewRecorder()
	req, _ := http.NewRequest("GET", url, nil)
	r.ServeHTTP(w, req)

	assert.Equal(s.T(), http.StatusOK, w.Code)
	var payload []map[string]any
	s.Require().NoError(json.Unmarshal(w.Body.Bytes(), &payload))
	s.Require().Len(payload, 1)
	item := payload[0]
	assert.Equal(s.T(), float64(5), item["rating"])
	assert.Equal(s.T(), "Great", item["feedback_message"])
	assert.Equal(s.T(), "Needs follow up", item["csat_review_notes"])
	assert.Equal(s.T(), float64(42), item["conversation_id"])
	assert.Equal(s.T(), float64(message.ID), item["message_id"])
	assert.Equal(s.T(), float64(createdAt.Unix()), item["created_at"])

	contactPayload := item["contact"].(map[string]any)
	assert.Equal(s.T(), contact.Name, contactPayload["name"])
	assert.Equal(s.T(), contact.Email, contactPayload["email"])
	agentPayload := item["assigned_agent"].(map[string]any)
	assert.Equal(s.T(), agent.Email, agentPayload["email"])
	reviewerPayload := item["review_notes_updated_by"].(map[string]any)
	assert.Equal(s.T(), reviewer.Name, reviewerPayload["name"])
}

func (s *CsatSurveyHandlerTestSuite) TestMetrics_ChatwootPayloadAndFilters() {
	createdAt := time.Now().Add(-2 * time.Hour).Truncate(time.Second)
	agent, _, _, conversation, _ := s.seedAccountCsatResponseGraph(createdAt, 5)

	r := gin.New()
	r.GET("/api/v1/accounts/:account_id/csat_survey_responses/metrics", s.handler.Metrics)

	url := fmt.Sprintf("/api/v1/accounts/%d/csat_survey_responses/metrics?since=%d&until=%d&user_ids=%d&inbox_id=%d&rating=5",
		s.account.ID, createdAt.Add(-time.Hour).Unix(), createdAt.Add(time.Hour).Unix(), agent.ID, conversation.InboxID)
	w := httptest.NewRecorder()
	req, _ := http.NewRequest("GET", url, nil)
	r.ServeHTTP(w, req)

	assert.Equal(s.T(), http.StatusOK, w.Code)
	var payload map[string]any
	s.Require().NoError(json.Unmarshal(w.Body.Bytes(), &payload))
	assert.Equal(s.T(), float64(1), payload["total_count"])
	assert.Equal(s.T(), float64(1), payload["total_sent_messages_count"])
	ratings := payload["ratings_count"].(map[string]any)
	assert.Equal(s.T(), float64(1), ratings["5"])
}

func (s *CsatSurveyHandlerTestSuite) TestDownload_ChatwootCSVAndFilters() {
	createdAt := time.Date(2026, 6, 5, 10, 30, 0, 0, time.UTC)
	agent, _, contact, conversation, _ := s.seedAccountCsatResponseGraph(createdAt, 5)
	otherContact := &model.Contact{AccountID: s.account.ID, Name: "Other Contact"}
	s.Require().NoError(s.db.Create(otherContact).Error)
	otherConversation := &model.Conversation{AccountID: s.account.ID, InboxID: conversation.InboxID, ContactID: otherContact.ID, Status: "resolved", ChannelType: "web_widget", Channel: "web_widget"}
	s.Require().NoError(s.db.Create(otherConversation).Error)
	s.Require().NoError(s.db.Create(&automation.CsatSurveyResponse{AccountID: s.account.ID, ConversationID: otherConversation.ID, ContactID: otherContact.ID, Rating: 3}).Error)

	r := gin.New()
	r.GET("/api/v1/accounts/:account_id/csat_survey_responses/download", s.handler.Download)
	since := int64(0)
	until := int64(32503680000)
	url := fmt.Sprintf("/api/v1/accounts/%d/csat_survey_responses/download?since=%d&until=%d&user_ids=%d&inbox_id=%d&team_id=%d&rating=5",
		s.account.ID, since, until, agent.ID, conversation.InboxID, *conversation.TeamID)
	w := httptest.NewRecorder()
	req, _ := http.NewRequest("GET", url, nil)
	req.Host = "app.example.test"
	req.Header.Set("X-Forwarded-Proto", "https")
	r.ServeHTTP(w, req)

	assert.Equal(s.T(), http.StatusOK, w.Code)
	assert.Equal(s.T(), "attachment; filename=csat_report.csv", w.Header().Get("Content-Disposition"))
	reader := csv.NewReader(strings.NewReader(w.Body.String()))
	reader.FieldsPerRecord = -1
	rows, err := reader.ReadAll()
	s.Require().NoError(err)
	s.Require().Len(rows, 3)
	assert.Equal(s.T(), []string{"Agent Name", "Rating", "Feedback Comment", "Contact Name", "Contact Email Address", "Contact Phone Number", "Link to the conversation", "Recorded date", "Review Notes"}, rows[0])
	assert.Equal(s.T(), "CSAT Agent (csat-agent@example.com)", rows[1][0])
	assert.Equal(s.T(), "5", rows[1][1])
	assert.Equal(s.T(), "Great", rows[1][2])
	assert.Equal(s.T(), contact.Name, rows[1][3])
	assert.Equal(s.T(), contact.Email, rows[1][4])
	assert.Equal(s.T(), contact.PhoneNumber, rows[1][5])
	assert.Equal(s.T(), fmt.Sprintf("https://app.example.test/app/accounts/%d/conversations/42", s.account.ID), rows[1][6])
	assert.Equal(s.T(), createdAt.Format(time.RFC3339), rows[1][7])
	assert.Equal(s.T(), "Needs follow up", rows[1][8])
	assert.Equal(s.T(), "Reporting period 1970-01-01 to 3000-01-01", rows[2][0])
}

func (s *CsatSurveyHandlerTestSuite) TestUpdateReviewNotes_Success() {
	_, reviewer, _, _, _ := s.seedAccountCsatResponseGraph(time.Now().Add(-time.Hour), 5)
	var survey automation.CsatSurveyResponse
	s.Require().NoError(s.db.First(&survey).Error)

	r := gin.New()
	r.PUT("/api/v1/accounts/:account_id/csats/:id/review_notes", func(c *gin.Context) {
		c.Set("user_id", float64(reviewer.ID))
		s.handler.UpdateReviewNotes(c)
	})

	w := httptest.NewRecorder()
	body := `{"review_notes":"good conversation"}`
	req, _ := http.NewRequest("PUT", fmt.Sprintf("/api/v1/accounts/%d/csats/%d/review_notes", s.account.ID, survey.ID), bytes.NewBufferString(body))
	req.Header.Set("Content-Type", "application/json")
	r.ServeHTTP(w, req)

	assert.Equal(s.T(), http.StatusOK, w.Code)
	var payload map[string]any
	s.Require().NoError(json.Unmarshal(w.Body.Bytes(), &payload))
	assert.Equal(s.T(), "good conversation", payload["csat_review_notes"])
	reviewerPayload := payload["review_notes_updated_by"].(map[string]any)
	assert.Equal(s.T(), reviewer.Name, reviewerPayload["name"])
}

func (s *CsatSurveyHandlerTestSuite) TestUpdate_Success() {
	survey := &automation.CsatSurveyResponse{AccountID: s.account.ID, ConversationID: 1, Rating: 5}
	s.Require().NoError(s.db.Create(survey).Error)

	r := gin.New()
	r.PUT("/api/v1/accounts/:account_id/csats/:id", func(c *gin.Context) {
		c.Set("user_id", float64(1))
		s.handler.Update(c)
	})

	w := httptest.NewRecorder()
	body := `{"review_notes":"updated notes"}`
	req, _ := http.NewRequest("PUT", fmt.Sprintf("/api/v1/accounts/%d/csats/%d", s.account.ID, survey.ID), bytes.NewBufferString(body))
	req.Header.Set("Content-Type", "application/json")
	r.ServeHTTP(w, req)

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

func (s *CsatSurveyHandlerTestSuite) TestPublicCsatShowAndUpdate_Success() {
	conversation, message := s.seedPublicCsatSurvey(time.Now())

	r := gin.New()
	r.GET("/public/api/v1/csat_survey/:id", s.handler.PublicGet)
	r.PATCH("/public/api/v1/csat_survey/:id", s.handler.PublicUpdate)

	wShow := httptest.NewRecorder()
	reqShow, _ := http.NewRequest("GET", "/public/api/v1/csat_survey/"+conversation.UUID, nil)
	r.ServeHTTP(wShow, reqShow)
	assert.Equal(s.T(), http.StatusOK, wShow.Code)

	var showResp map[string]any
	s.Require().NoError(json.Unmarshal(wShow.Body.Bytes(), &showResp))
	assert.Equal(s.T(), float64(message.ID), showResp["id"])
	assert.Nil(s.T(), showResp["csat_survey_response"])
	assert.Equal(s.T(), "emoji", showResp["display_type"])
	assert.Equal(s.T(), "Rate this chat", showResp["content"])
	assert.Equal(s.T(), "CSAT Inbox", showResp["inbox_name"])

	body := `{"message":{"submitted_values":{"csat_survey_response":{"rating":4,"feedback_message":"Helpful"}}}}`
	wUpdate := httptest.NewRecorder()
	reqUpdate, _ := http.NewRequest("PATCH", "/public/api/v1/csat_survey/"+conversation.UUID, bytes.NewBufferString(body))
	reqUpdate.Header.Set("Content-Type", "application/json")
	r.ServeHTTP(wUpdate, reqUpdate)
	assert.Equal(s.T(), http.StatusOK, wUpdate.Code)

	var updateResp map[string]any
	s.Require().NoError(json.Unmarshal(wUpdate.Body.Bytes(), &updateResp))
	csatResp := updateResp["csat_survey_response"].(map[string]any)
	assert.Equal(s.T(), float64(4), csatResp["rating"])
	assert.Equal(s.T(), "Helpful", csatResp["feedback_message"])

	var stored automation.CsatSurveyResponse
	s.Require().NoError(s.db.Where("message_id = ?", message.ID).First(&stored).Error)
	assert.Equal(s.T(), 4, stored.Rating)
	assert.Equal(s.T(), "Helpful", stored.FeedbackMessage)
	assert.Equal(s.T(), conversation.ContactID, stored.ContactID)
	s.Require().NotNil(stored.MessageID)
	assert.Equal(s.T(), message.ID, *stored.MessageID)

	var storedMessage model.Message
	s.Require().NoError(s.db.First(&storedMessage, message.ID).Error)
	var attrs map[string]any
	s.Require().NoError(json.Unmarshal(storedMessage.ContentAttributes, &attrs))
	submittedValues := attrs["submitted_values"].(map[string]any)
	assert.Contains(s.T(), submittedValues, "csat_survey_response")

	secondBody := `{"message":{"submitted_values":{"csat_survey_response":{"rating":2,"feedback_message":"Could be better"}}}}`
	wSecondUpdate := httptest.NewRecorder()
	reqSecondUpdate, _ := http.NewRequest("PATCH", "/public/api/v1/csat_survey/"+conversation.UUID, bytes.NewBufferString(secondBody))
	reqSecondUpdate.Header.Set("Content-Type", "application/json")
	r.ServeHTTP(wSecondUpdate, reqSecondUpdate)
	assert.Equal(s.T(), http.StatusOK, wSecondUpdate.Code)

	var count int64
	s.Require().NoError(s.db.Model(&automation.CsatSurveyResponse{}).Where("message_id = ?", message.ID).Count(&count).Error)
	assert.Equal(s.T(), int64(1), count)
	s.Require().NoError(s.db.Where("message_id = ?", message.ID).First(&stored).Error)
	assert.Equal(s.T(), 2, stored.Rating)
	assert.Equal(s.T(), "Could be better", stored.FeedbackMessage)
}

func (s *CsatSurveyHandlerTestSuite) TestPublicCsatUpdate_LockedAfter14Days() {
	conversation, _ := s.seedPublicCsatSurvey(time.Now().AddDate(0, 0, -15))

	r := gin.New()
	r.PATCH("/public/api/v1/csat_survey/:id", s.handler.PublicUpdate)

	body := `{"message":{"submitted_values":[{"csat_survey_response":{"rating":5,"feedback_message":"Too late"}}]}}`
	w := httptest.NewRecorder()
	req, _ := http.NewRequest("PATCH", "/public/api/v1/csat_survey/"+conversation.UUID, bytes.NewBufferString(body))
	req.Header.Set("Content-Type", "application/json")
	r.ServeHTTP(w, req)
	assert.Equal(s.T(), http.StatusUnprocessableEntity, w.Code)
	assert.Contains(s.T(), w.Body.String(), "You cannot update the CSAT survey after 14 days")
}

func (s *CsatSurveyHandlerTestSuite) TestList_BadRequest_InvalidAccountID() {
	r := gin.New()
	r.GET("/api/v1/accounts/:account_id/csats", s.handler.List)

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

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

func (s *CsatSurveyHandlerTestSuite) seedPublicCsatSurvey(createdAt time.Time) (*model.Conversation, *model.Message) {
	contact := &model.Contact{AccountID: s.account.ID, Name: "CSAT Contact"}
	s.Require().NoError(s.db.Create(contact).Error)
	inbox := &model.Inbox{
		AccountID:         s.account.ID,
		Name:              "CSAT Inbox",
		ChannelType:       "web_widget",
		Enabled:           true,
		CsatSurveyEnabled: true,
		CsatConfig:        `{"display_type":"emoji","message":"Rate this chat"}`,
		AvatarURL:         "https://example.test/avatar.png",
	}
	s.Require().NoError(s.db.Create(inbox).Error)
	conversation := &model.Conversation{
		AccountID:   s.account.ID,
		InboxID:     inbox.ID,
		ContactID:   contact.ID,
		Status:      "resolved",
		ChannelType: inbox.ChannelType,
		Channel:     inbox.ChannelType,
	}
	s.Require().NoError(s.db.Create(conversation).Error)
	message := &model.Message{
		ConversationID:    conversation.ID,
		AccountID:         s.account.ID,
		InboxID:           inbox.ID,
		Content:           "Please rate this conversation",
		ContentType:       "input_csat",
		MessageType:       "outgoing",
		Status:            "sent",
		ContentAttributes: datatypes.JSON(`{}`),
	}
	s.Require().NoError(s.db.Create(message).Error)
	s.Require().NoError(s.db.Model(message).Updates(map[string]any{"created_at": createdAt, "updated_at": createdAt}).Error)
	s.Require().NoError(s.db.First(message, message.ID).Error)
	return conversation, message
}

func (s *CsatSurveyHandlerTestSuite) seedAccountCsatResponseGraph(createdAt time.Time, rating int) (*model.User, *model.User, *model.Contact, *model.Conversation, *model.Message) {
	agent := &model.User{AccountID: s.account.ID, Name: "CSAT Agent", Email: "csat-agent@example.com", Role: "agent", Active: true}
	reviewer := &model.User{AccountID: s.account.ID, Name: "CSAT Reviewer", Email: "csat-reviewer@example.com", Role: "administrator", Active: true}
	s.Require().NoError(s.db.Create(agent).Error)
	s.Require().NoError(s.db.Create(reviewer).Error)
	s.Require().NoError(s.db.Create(&model.AccountUser{AccountID: s.account.ID, UserID: agent.ID, Role: "agent"}).Error)
	s.Require().NoError(s.db.Create(&model.AccountUser{AccountID: s.account.ID, UserID: reviewer.ID, Role: "administrator"}).Error)

	contact := &model.Contact{AccountID: s.account.ID, Name: "CSAT Contact", Email: "csat@example.com", PhoneNumber: "+15550000"}
	s.Require().NoError(s.db.Create(contact).Error)
	inbox := &model.Inbox{AccountID: s.account.ID, Name: "CSAT Inbox", ChannelType: "web_widget", Enabled: true}
	s.Require().NoError(s.db.Create(inbox).Error)
	displayID := uint(42)
	teamID := uint(7)
	conversation := &model.Conversation{
		AccountID:   s.account.ID,
		DisplayID:   &displayID,
		InboxID:     inbox.ID,
		ContactID:   contact.ID,
		AssigneeID:  &agent.ID,
		TeamID:      &teamID,
		Status:      "resolved",
		ChannelType: "web_widget",
		Channel:     "web_widget",
	}
	s.Require().NoError(s.db.Create(conversation).Error)
	message := &model.Message{ConversationID: conversation.ID, AccountID: s.account.ID, InboxID: inbox.ID, ContentType: "input_csat", MessageType: "outgoing", Content: "Rate this"}
	s.Require().NoError(s.db.Create(message).Error)
	s.Require().NoError(s.db.Model(message).Updates(map[string]any{"created_at": createdAt, "updated_at": createdAt}).Error)
	s.Require().NoError(s.db.First(message, message.ID).Error)
	reviewerID := reviewer.ID
	updatedAt := createdAt.Add(30 * time.Minute)
	response := &automation.CsatSurveyResponse{
		AccountID:              s.account.ID,
		ConversationID:         conversation.ID,
		ContactID:              contact.ID,
		MessageID:              &message.ID,
		AssignedAgentID:        &agent.ID,
		Rating:                 rating,
		FeedbackMessage:        "Great",
		CsatReviewNotes:        "Needs follow up",
		ReviewNotesUpdatedByID: &reviewerID,
		ReviewNotesUpdatedAt:   &updatedAt,
	}
	s.Require().NoError(s.db.Create(response).Error)
	s.Require().NoError(s.db.Model(response).Updates(map[string]any{"created_at": createdAt, "updated_at": createdAt}).Error)
	return agent, reviewer, contact, conversation, message
}