package v1

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

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

	"github.com/gochat/gochat/internal/model"
	"github.com/gochat/gochat/internal/repository"
	"github.com/gochat/gochat/internal/service"
)

func uintPtr(v uint) *uint { return &v }

func setupNotificationDB(t *testing.T) *gorm.DB {
	t.Helper()
	db, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{})
	assert.NoError(t, err)
	err = db.AutoMigrate(&model.Notification{}, &model.User{}, &model.Account{}, &model.NotificationPreference{})
	assert.NoError(t, err)
	return db
}

func setupNotificationHandler(t *testing.T, db *gorm.DB) *NotificationHandler {
	t.Helper()
	notifRepo := repository.NewNotificationRepo(db)
	prefRepo := repository.NewNotificationPreferenceRepo(db)
	ns := service.NewNotificationService(db, notifRepo, prefRepo)
	return NewNotificationHandler(ns)
}

func setupNotificationRouter(handler *NotificationHandler) *gin.Engine {
	gin.SetMode(gin.TestMode)
	router := gin.New()
	router.GET("/api/v1/accounts/:account_id/notifications", handler.List)
	router.GET("/api/v1/accounts/:account_id/notifications/:id", handler.Get)
	router.POST("/api/v1/accounts/:account_id/notifications/read_all", handler.MarkAllRead)
	router.PATCH("/api/v1/accounts/:account_id/notifications/:id/read", handler.MarkRead)
	return router
}

func TestNotificationList(t *testing.T) {
	db := setupNotificationDB(t)
	handler := setupNotificationHandler(t, db)
	router := setupNotificationRouter(handler)

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

	assert.Equal(t, http.StatusOK, w.Code)
	sqlDB, _ := db.DB()
	sqlDB.Close()
}

func TestNotificationListEmpty(t *testing.T) {
	db := setupNotificationDB(t)
	handler := setupNotificationHandler(t, db)
	router := setupNotificationRouter(handler)

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

	assert.Equal(t, http.StatusOK, w.Code)
	sqlDB, _ := db.DB()
	sqlDB.Close()
}

func TestNotificationGet(t *testing.T) {
	db := setupNotificationDB(t)
	handler := setupNotificationHandler(t, db)
	router := setupNotificationRouter(handler)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("GET", "/api/v1/accounts/1/notifications/10", nil)
	router.ServeHTTP(w, req)

	assert.Equal(t, http.StatusNotFound, w.Code) // notification doesn't exist
	sqlDB, _ := db.DB()
	sqlDB.Close()
}

func TestNotificationGetDifferentID(t *testing.T) {
	db := setupNotificationDB(t)
	handler := setupNotificationHandler(t, db)
	router := setupNotificationRouter(handler)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("GET", "/api/v1/accounts/5/notifications/42", nil)
	router.ServeHTTP(w, req)

	assert.Equal(t, http.StatusNotFound, w.Code) // notification doesn't exist
	sqlDB, _ := db.DB()
	sqlDB.Close()
}

func TestNotificationReadAll(t *testing.T) {
	db := setupNotificationDB(t)
	handler := setupNotificationHandler(t, db)
	router := setupNotificationRouter(handler)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("POST", "/api/v1/accounts/1/notifications/read_all", nil)
	router.ServeHTTP(w, req)

	assert.Equal(t, http.StatusOK, w.Code)
	sqlDB, _ := db.DB()
	sqlDB.Close()
}

func TestNotificationMarkRead(t *testing.T) {
	db := setupNotificationDB(t)
	handler := setupNotificationHandler(t, db)
	router := setupNotificationRouter(handler)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("PATCH", "/api/v1/accounts/1/notifications/5/read", nil)
	router.ServeHTTP(w, req)

	assert.Equal(t, http.StatusNotFound, w.Code) // notification doesn't exist
	sqlDB, _ := db.DB()
	sqlDB.Close()
}

func TestNotificationCRUDWithDB(t *testing.T) {
	db := setupNotificationDB(t)

	user := &model.User{Name: "Notif User", Email: "notif@example.com", Password: "pass", AccountID: 1}
	db.Create(user)

	// Create notification
	notif := &model.Notification{
		UserID:            user.ID,
		AccountID:         uintPtr(1),
		NotificationType:  "conversation_assignment",
		PrimaryActorType:  "conversation",
		PrimaryActorID:    5,
		SecondaryActorType: "user",
		SecondaryActorID:   3,
	}
	err := db.Create(notif).Error
	assert.NoError(t, err)
	assert.NotEqual(t, 0, notif.ID)

	// Read notification
	var fetched model.Notification
	err = db.First(&fetched, notif.ID).Error
	assert.NoError(t, err)
	assert.Equal(t, "conversation_assignment", fetched.NotificationType)
	assert.Nil(t, fetched.ReadAt)

	// Mark as read
	now := time.Now()
	err = db.Model(&fetched).Update("read_at", &now).Error
	assert.NoError(t, err)
	err = db.First(&fetched, notif.ID).Error
	assert.NoError(t, err)
	assert.NotNil(t, fetched.ReadAt)

	// Delete notification
	err = db.Delete(&fetched).Error
	assert.NoError(t, err)
	err = db.First(&fetched, notif.ID).Error
	assert.Error(t, err)

	sqlDB, _ := db.DB()
	sqlDB.Close()
}

func TestNotificationReadAllWithDB(t *testing.T) {
	db := setupNotificationDB(t)

	user := &model.User{Name: "Notif User2", Email: "notif2@example.com", Password: "pass", AccountID: 1}
	db.Create(user)

	// Create multiple unread notifications
	for i := 0; i < 5; i++ {
		notif := &model.Notification{
			UserID:            user.ID,
			AccountID:         uintPtr(1),
			NotificationType:  "message_created",
			PrimaryActorType:  "message",
			PrimaryActorID:    uint(i + 1),
		}
		err := db.Create(notif).Error
		assert.NoError(t, err)
	}

	// Verify all are unread
	var unreadCount int64
	db.Model(&model.Notification{}).Where("user_id = ? AND read_at IS NULL", user.ID).Count(&unreadCount)
	assert.Equal(t, int64(5), unreadCount)

	// Mark all as read
	now := time.Now()
	db.Model(&model.Notification{}).Where("user_id = ? AND read_at IS NULL", user.ID).Update("read_at", &now)

	// Verify all are read
	db.Model(&model.Notification{}).Where("user_id = ? AND read_at IS NULL", user.ID).Count(&unreadCount)
	assert.Equal(t, int64(0), unreadCount)

	sqlDB, _ := db.DB()
	sqlDB.Close()
}

func TestNotificationTypes(t *testing.T) {
	types := []string{
		"conversation_assignment",
		"conversation_created",
		"message_created",
		"assigned_conversation_new_message",
		"conversation_mention",
	}
	for _, nt := range types {
		notif := model.Notification{NotificationType: nt}
		assert.Equal(t, nt, notif.NotificationType)
	}
}

func TestNotificationModelFields(t *testing.T) {
	notif := model.Notification{
		UserID:            1,
		AccountID:         uintPtr(2),
		NotificationType:  "conversation_assignment",
		PrimaryActorType:  "conversation",
		PrimaryActorID:    5,
		SecondaryActorType: "user",
		SecondaryActorID:   3,
	}
	assert.Equal(t, uint(1), notif.UserID)
	assert.Equal(t, uintPtr(2), notif.AccountID)
	assert.Equal(t, "conversation_assignment", notif.NotificationType)
	assert.Nil(t, notif.ReadAt)
}

func TestNotificationPagination(t *testing.T) {
	db := setupNotificationDB(t)
	handler := setupNotificationHandler(t, db)
	router := setupNotificationRouter(handler)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("GET", "/api/v1/accounts/1/notifications?page=1&per_page=20", nil)
	router.ServeHTTP(w, req)

	assert.Equal(t, http.StatusOK, w.Code)
	sqlDB, _ := db.DB()
	sqlDB.Close()
}

func TestNotificationListByAccount(t *testing.T) {
	db := setupNotificationDB(t)

	user1 := &model.User{Name: "User1", Email: "u1@example.com", Password: "pass", AccountID: 1}
	user2 := &model.User{Name: "User2", Email: "u2@example.com", Password: "pass", AccountID: 2}
	db.Create(user1)
	db.Create(user2)

	for i := 0; i < 3; i++ {
		notif := &model.Notification{UserID: user1.ID, AccountID: uintPtr(1), NotificationType: "message_created", PrimaryActorType: "message", PrimaryActorID: uint(i + 1)}
		db.Create(notif)
	}
	for i := 0; i < 2; i++ {
		notif := &model.Notification{UserID: user2.ID, AccountID: uintPtr(2), NotificationType: "conversation_assignment", PrimaryActorType: "conversation", PrimaryActorID: uint(i + 1)}
		db.Create(notif)
	}

	var account1Notifs []model.Notification
	err := db.Where("account_id = ?", 1).Find(&account1Notifs).Error
	assert.NoError(t, err)
	assert.Equal(t, 3, len(account1Notifs))

	var account2Notifs []model.Notification
	err = db.Where("account_id = ?", 2).Find(&account2Notifs).Error
	assert.NoError(t, err)
	assert.Equal(t, 2, len(account2Notifs))

	sqlDB, _ := db.DB()
	sqlDB.Close()
}

func TestNotificationGetInvalidID(t *testing.T) {
	db := setupNotificationDB(t)
	handler := setupNotificationHandler(t, db)
	router := setupNotificationRouter(handler)

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

	assert.Equal(t, http.StatusBadRequest, w.Code) // invalid ID format
	sqlDB, _ := db.DB()
	sqlDB.Close()
}

func TestNotificationReadSpecificNotification(t *testing.T) {
	db := setupNotificationDB(t)

	user := &model.User{Name: "Specific User", Email: "specific@example.com", Password: "pass", AccountID: 1}
	db.Create(user)

	notif := &model.Notification{UserID: user.ID, AccountID: uintPtr(1), NotificationType: "message_created", PrimaryActorType: "message", PrimaryActorID: 1}
	db.Create(notif)

	// Read specific notification
	err := db.Model(notif).Update("ReadAt", time.Now()).Error
	assert.NoError(t, err)

	var fetched model.Notification
	db.First(&fetched, notif.ID)
	assert.NotNil(t, fetched.ReadAt)

	sqlDB, _ := db.DB()
	sqlDB.Close()
}

func TestNotificationFilterByReadStatus(t *testing.T) {
	db := setupNotificationDB(t)

	user := &model.User{Name: "Filter User", Email: "filter@example.com", Password: "pass", AccountID: 1}
	db.Create(user)

	// Create mix of read and unread
	for i := 0; i < 5; i++ {
		var readAt *time.Time
		if i%2 == 0 {
			readAt = &time.Time{}
		}
		notif := &model.Notification{UserID: user.ID, AccountID: uintPtr(1), NotificationType: "message_created", PrimaryActorType: "message", PrimaryActorID: uint(i + 1), ReadAt: readAt}
		db.Create(notif)
	}

	var unread []model.Notification
	err := db.Where("user_id = ? AND read_at IS NULL", user.ID).Find(&unread).Error
	assert.NoError(t, err)
	assert.Equal(t, 2, len(unread)) // indices 1,3 are unread

	var read []model.Notification
	err = db.Where("user_id = ? AND read_at IS NOT NULL", user.ID).Find(&read).Error
	assert.NoError(t, err)
	assert.Equal(t, 3, len(read)) // indices 0,2,4 are read

	sqlDB, _ := db.DB()
	sqlDB.Close()
}

func TestNotificationSoftDelete(t *testing.T) {
	db := setupNotificationDB(t)

	user := &model.User{Name: "SoftDel Notif User", Email: "softdel@example.com", Password: "pass", AccountID: 1}
	db.Create(user)

	notif := &model.Notification{UserID: user.ID, AccountID: uintPtr(1), NotificationType: "message_created", PrimaryActorType: "message", PrimaryActorID: 1}
	db.Create(notif)

	err := db.Delete(notif).Error
	assert.NoError(t, err)

	var found model.Notification
	err = db.First(&found, notif.ID).Error
	assert.Error(t, err)

	err = db.Unscoped().First(&found, notif.ID).Error
	assert.NoError(t, err)

	sqlDB, _ := db.DB()
	sqlDB.Close()
}