package services

import (
	"context"
	"fmt"
	jsoniter "github.com/json-iterator/go"
	"github.com/samber/lo"
	"reflect"
	"time"

	"git.solsynth.dev/hydrogen/dealer/pkg/proto"
	"git.solsynth.dev/hydrogen/passport/pkg/internal/gap"

	"git.solsynth.dev/hydrogen/passport/pkg/internal/database"
	"git.solsynth.dev/hydrogen/passport/pkg/internal/models"
)

func AddNotifySubscriber(user models.Account, provider, id, tk, ua string) (models.NotificationSubscriber, error) {
	var prev models.NotificationSubscriber
	var subscriber models.NotificationSubscriber
	if err := database.C.Where(&models.NotificationSubscriber{
		DeviceID:  id,
		AccountID: user.ID,
	}); err != nil {
		subscriber = models.NotificationSubscriber{
			UserAgent:   ua,
			Provider:    provider,
			DeviceID:    id,
			DeviceToken: tk,
			AccountID:   user.ID,
		}
	} else {
		prev = subscriber
	}

	subscriber.UserAgent = ua
	subscriber.Provider = provider
	subscriber.DeviceToken = tk

	var err error
	if !reflect.DeepEqual(subscriber, prev) {
		err = database.C.Save(&subscriber).Error
	}

	return subscriber, err
}

// NewNotification will create a notification and push via the push method it
func NewNotification(notification models.Notification) error {
	if err := database.C.Save(&notification).Error; err != nil {
		return err
	}
	if err := PushNotification(notification); err != nil {
		return err
	}

	return nil
}

func NewNotificationBatch(notifications []models.Notification) error {
	if err := database.C.CreateInBatches(notifications, 1000).Error; err != nil {
		return err
	}

	PushNotificationBatch(notifications)
	return nil
}

func PushNotification(notification models.Notification) error {
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()
	_, err := proto.NewStreamControllerClient(gap.H.GetDealerGrpcConn()).PushStream(ctx, &proto.PushStreamRequest{
		UserId: lo.ToPtr(uint64(notification.AccountID)),
		Body: models.UnifiedCommand{
			Action:  "notifications.new",
			Payload: notification,
		}.Marshal(),
	})
	if err != nil {
		return fmt.Errorf("failed to push via websocket: %v", err)
	}

	// Skip push notification
	if GetStatusDisturbable(notification.AccountID) != nil {
		return nil
	}

	var subscribers []models.NotificationSubscriber
	if err := database.C.Where(&models.NotificationSubscriber{
		AccountID: notification.AccountID,
	}).Find(&subscribers).Error; err != nil {
		return err
	}

	var providers []string
	var tokens []string
	for _, subscriber := range subscribers {
		providers = append(providers, subscriber.Provider)
		tokens = append(tokens, subscriber.DeviceToken)
	}

	metadata, _ := jsoniter.Marshal(notification.Metadata)

	ctx, cancel = context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()
	_, err = proto.NewPostmanClient(gap.H.GetDealerGrpcConn()).DeliverNotificationBatch(ctx, &proto.DeliverNotificationBatchRequest{
		Providers:    providers,
		DeviceTokens: tokens,
		Notify: &proto.NotifyRequest{
			Topic:       notification.Topic,
			Title:       notification.Title,
			Subtitle:    notification.Subtitle,
			Body:        notification.Body,
			Metadata:    metadata,
			Avatar:      notification.Avatar,
			Picture:     notification.Picture,
			IsRealtime:  notification.IsRealtime,
			IsForcePush: notification.IsForcePush,
		},
	})

	return err
}

func PushNotificationBatch(notifications []models.Notification) {
	accountIdx := lo.Map(notifications, func(item models.Notification, index int) uint {
		return item.AccountID
	})
	var subscribers []models.NotificationSubscriber
	database.C.Where("account_id IN ?", accountIdx).Find(&subscribers)

	stream := proto.NewStreamControllerClient(gap.H.GetDealerGrpcConn())
	for _, notification := range notifications {
		ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
		_, _ = stream.PushStream(ctx, &proto.PushStreamRequest{
			UserId: lo.ToPtr(uint64(notification.AccountID)),
			Body: models.UnifiedCommand{
				Action:  "notifications.new",
				Payload: notification,
			}.Marshal(),
		})
		cancel()

		// Skip push notification
		if GetStatusDisturbable(notification.AccountID) != nil {
			continue
		}

		var providers []string
		var tokens []string
		for _, subscriber := range lo.Filter(subscribers, func(item models.NotificationSubscriber, index int) bool {
			return item.AccountID == notification.AccountID
		}) {
			providers = append(providers, subscriber.Provider)
			tokens = append(tokens, subscriber.DeviceToken)
		}

		metadata, _ := jsoniter.Marshal(notification.Metadata)

		ctx, cancel = context.WithTimeout(context.Background(), 5*time.Second)
		_, _ = proto.NewPostmanClient(gap.H.GetDealerGrpcConn()).DeliverNotificationBatch(ctx, &proto.DeliverNotificationBatchRequest{
			Providers:    providers,
			DeviceTokens: tokens,
			Notify: &proto.NotifyRequest{
				Topic:       notification.Topic,
				Title:       notification.Title,
				Subtitle:    notification.Subtitle,
				Body:        notification.Body,
				Metadata:    metadata,
				Avatar:      notification.Avatar,
				Picture:     notification.Picture,
				IsRealtime:  notification.IsRealtime,
				IsForcePush: notification.IsForcePush,
			},
		})
		cancel()
	}
}