package v1

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

	"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 AuditHandlerTestSuite struct {
	suite.Suite
	db      *gorm.DB
	handler *AuditHandler
	account *model.Account
}

func (s *AuditHandlerTestSuite) 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.Audit{}))
	s.db = db

	repo := repository.NewAuditRepo(db)
	svc := service.NewAuditService(repo)
	s.handler = NewAuditHandler(svc)

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

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

func TestAuditHandlerSuite(t *testing.T) {
	suite.Run(t, new(AuditHandlerTestSuite))
}

func (s *AuditHandlerTestSuite) SetupTest() {
	s.Require().NoError(s.db.Exec("DELETE FROM audits").Error)
}

func (s *AuditHandlerTestSuite) TestList_ChatwootPayloadFiltersAndSerializer() {
	r := gin.New()
	r.GET("/api/v1/accounts/:account_id/audit_logs", withAuditRole("administrator", s.handler.List))

	createdAt := time.Unix(1710000000, 0).UTC()
	userID := uint(42)
	associatedID := s.account.ID
	version := 3
	audit := &model.Audit{
		AccountID:      &s.account.ID,
		UserID:         &userID,
		AuditableType:  "Conversation",
		AuditableID:    777,
		Action:         "update",
		AuditedChanges: json.RawMessage(`{"status":["open","resolved"]}`),
		AssociatedType: "Account",
		AssociatedID:   &associatedID,
		Username:       "admin@example.com",
		RemoteAddress:  "203.0.113.10",
		RequestUUID:    "req-123",
		Version:        &version,
		Comment:        "status changed",
		UserType:       "User",
		CreatedAt:      createdAt,
	}
	s.Require().NoError(s.db.Create(audit).Error)

	otherAccount := &model.Account{Name: "other-audit-account"}
	s.Require().NoError(s.db.Create(otherAccount).Error)
	s.Require().NoError(s.db.Create(&model.Audit{
		AccountID:      &otherAccount.ID,
		AuditableType:  "Conversation",
		AuditableID:    999,
		Action:         "update",
		AuditedChanges: json.RawMessage(`{}`),
	}).Error)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("GET", fmt.Sprintf("/api/v1/accounts/%d/audit_logs?page=1&per_page=100&action=update&auditable_type=Conversation", s.account.ID), nil)
	r.ServeHTTP(w, req)

	assert.Equal(s.T(), http.StatusOK, w.Code)
	var body map[string]any
	s.Require().NoError(json.Unmarshal(w.Body.Bytes(), &body))
	assert.NotContains(s.T(), body, "success")
	assert.Equal(s.T(), float64(25), body["per_page"])
	assert.Equal(s.T(), float64(1), body["current_page"])
	assert.Equal(s.T(), float64(1), body["total_entries"])

	logs := body["audit_logs"].([]any)
	s.Require().Len(logs, 1)
	log := logs[0].(map[string]any)
	assert.Equal(s.T(), float64(audit.ID), log["id"])
	assert.Equal(s.T(), float64(777), log["auditable_id"])
	assert.Equal(s.T(), "Conversation", log["auditable_type"])
	assert.Contains(s.T(), log, "auditable")
	assert.Nil(s.T(), log["auditable"])
	assert.Equal(s.T(), float64(s.account.ID), log["associated_id"])
	assert.Equal(s.T(), "Account", log["associated_type"])
	assert.Equal(s.T(), float64(userID), log["user_id"])
	assert.Equal(s.T(), "User", log["user_type"])
	assert.Equal(s.T(), "admin@example.com", log["username"])
	assert.Equal(s.T(), "update", log["action"])
	assert.Equal(s.T(), float64(version), log["version"])
	assert.Equal(s.T(), "status changed", log["comment"])
	assert.Equal(s.T(), "req-123", log["request_uuid"])
	assert.Equal(s.T(), float64(createdAt.Unix()), log["created_at"])
	assert.Equal(s.T(), "203.0.113.10", log["remote_address"])
}

func (s *AuditHandlerTestSuite) TestList_AssociatedAccountScopeAndFixedPageSize() {
	r := gin.New()
	r.GET("/api/v1/accounts/:account_id/audit_logs", withAuditRole("administrator", s.handler.List))

	associatedID := s.account.ID
	for i := 0; i < 26; i++ {
		s.Require().NoError(s.db.Create(&model.Audit{
			AuditableType:  "Conversation",
			AuditableID:    uint(i + 1),
			Action:         "update",
			AuditedChanges: json.RawMessage(`{}`),
			AssociatedType: "Account",
			AssociatedID:   &associatedID,
			CreatedAt:      time.Unix(int64(1710000000+i), 0),
		}).Error)
	}

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("GET", fmt.Sprintf("/api/v1/accounts/%d/audit_logs?page=2&per_page=1", s.account.ID), nil)
	r.ServeHTTP(w, req)

	assert.Equal(s.T(), http.StatusOK, w.Code)
	var body map[string]any
	s.Require().NoError(json.Unmarshal(w.Body.Bytes(), &body))
	assert.Equal(s.T(), float64(25), body["per_page"])
	assert.Equal(s.T(), float64(2), body["current_page"])
	assert.Equal(s.T(), float64(26), body["total_entries"])
	assert.Len(s.T(), body["audit_logs"].([]any), 1)
}

func (s *AuditHandlerTestSuite) TestList_ChatwootPaginationMetaAndDescendingOrder() {
	r := gin.New()
	r.GET("/api/v1/accounts/:account_id/audit_logs", withAuditRole("administrator", s.handler.List))

	associatedID := s.account.ID
	createdAt := time.Unix(1710000000, 0).UTC()
	for i := 0; i < 30; i++ {
		s.Require().NoError(s.db.Create(&model.Audit{
			AuditableType:  "Conversation",
			AuditableID:    uint(i + 1),
			Action:         "update",
			AuditedChanges: json.RawMessage(`{}`),
			AssociatedType: "Account",
			AssociatedID:   &associatedID,
			CreatedAt:      createdAt.Add(time.Duration(i) * time.Minute),
		}).Error)
	}

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("GET", fmt.Sprintf("/api/v1/accounts/%d/audit_logs?page=2", s.account.ID), nil)
	r.ServeHTTP(w, req)

	assert.Equal(s.T(), http.StatusOK, w.Code)
	var body map[string]any
	s.Require().NoError(json.Unmarshal(w.Body.Bytes(), &body))
	assert.Equal(s.T(), float64(25), body["per_page"])
	assert.Equal(s.T(), float64(2), body["current_page"])
	assert.Equal(s.T(), float64(30), body["total_entries"])

	logs := body["audit_logs"].([]any)
	s.Require().Len(logs, 5)
	for index, item := range logs {
		log := item.(map[string]any)
		expectedAuditableID := float64(5 - index)
		assert.Equal(s.T(), expectedAuditableID, log["auditable_id"])
		assert.Equal(s.T(), float64(createdAt.Add(time.Duration(4-index)*time.Minute).Unix()), log["created_at"])
	}
}

func (s *AuditHandlerTestSuite) TestList_UnauthorizedForAgent() {
	r := gin.New()
	r.GET("/api/v1/accounts/:account_id/audit_logs", withAuditRole("agent", s.handler.List))

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

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

func (s *AuditHandlerTestSuite) TestGet_BadRequest_InvalidID() {
	r := gin.New()
	r.GET("/api/v1/accounts/:account_id/audit_logs/:id", withAuditRole("administrator", s.handler.Get))

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

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

func withAuditRole(role string, h gin.HandlerFunc) gin.HandlerFunc {
	return func(c *gin.Context) {
		c.Set("role", role)
		h(c)
	}
}