package services

import (
	"fmt"
	"git.solsynth.dev/hydrogen/messaging/pkg/internal/database"
	"git.solsynth.dev/hydrogen/messaging/pkg/internal/models"
	jsoniter "github.com/json-iterator/go"
	"github.com/rs/zerolog/log"
	"github.com/samber/lo"
	"strings"
)

func CountEvent(channel models.Channel) int64 {
	var count int64
	if err := database.C.Where(models.Event{
		ChannelID: channel.ID,
	}).Model(&models.Event{}).Count(&count).Error; err != nil {
		return 0
	} else {
		return count
	}
}

func ListEvent(channel models.Channel, take int, offset int) ([]models.Event, error) {
	if take > 100 {
		take = 100
	}

	var events []models.Event
	if err := database.C.
		Where(models.Event{
			ChannelID: channel.ID,
		}).Limit(take).Offset(offset).
		Order("created_at DESC").
		Preload("Sender").
		Preload("Sender.Account").
		Find(&events).Error; err != nil {
		return events, err
	} else {
		return events, nil
	}
}

func GetEvent(channel models.Channel, id uint) (models.Event, error) {
	var event models.Event
	if err := database.C.
		Where(models.Event{
			BaseModel: models.BaseModel{ID: id},
			ChannelID: channel.ID,
		}).
		Preload("Sender").
		Preload("Sender.Account").
		First(&event).Error; err != nil {
		return event, err
	} else {
		return event, nil
	}
}

func GetEventWithSender(channel models.Channel, member models.ChannelMember, id uint) (models.Event, error) {
	var event models.Event
	if err := database.C.Where(models.Event{
		BaseModel: models.BaseModel{ID: id},
		ChannelID: channel.ID,
		SenderID:  member.ID,
	}).First(&event).Error; err != nil {
		return event, err
	} else {
		return event, nil
	}
}

func NewEvent(event models.Event) (models.Event, error) {
	var members []models.ChannelMember
	if err := database.C.Save(&event).Error; err != nil {
		return event, err
	} else if err = database.C.Where(models.ChannelMember{
		ChannelID: event.ChannelID,
	}).Preload("Account").Find(&members).Error; err != nil {
		// Couldn't get channel members, skip notifying
		return event, nil
	}

	channel := event.Channel
	event, _ = GetEvent(event.Channel, event.ID)
	for _, member := range members {
		PushCommand(member.AccountID, models.UnifiedCommand{
			Action:  "events.new",
			Payload: event,
		})
	}

	if strings.HasPrefix(event.Type, "messages") {
		event.Channel = channel
		NotifyMessageEvent(members, event)
	}

	return event, nil
}

func NotifyMessageEvent(members []models.ChannelMember, event models.Event) {
	var body models.EventMessageBody
	raw, _ := jsoniter.Marshal(event.Body)
	_ = jsoniter.Unmarshal(raw, &body)

	for _, member := range members {
		if member.ID != event.SenderID {
			switch member.Notify {
			case models.NotifyLevelNone:
				continue
			case models.NotifyLevelMentioned:
				if len(body.RelatedUsers) == 0 || !lo.Contains(body.RelatedUsers, member.AccountID) {
					continue
				}
			default:
				break
			}

			var displayText string
			if body.Algorithm == "plain" {
				displayText = body.Text
			}

			if len(displayText) == 0 {
				displayText = fmt.Sprintf("%d attachment(s)", len(body.Attachments))
			}

			var channelDisplay string
			if event.Channel.Type == models.ChannelTypeDirect {
				channelDisplay = "DM"
			}

			if len(channelDisplay) == 0 {
				channelDisplay = event.Channel.Alias
			}

			err := NotifyAccountMessager(member.Account,
				"incomingMessage",
				fmt.Sprintf("%s in #%s", event.Sender.Account.Nick, channelDisplay),
				fmt.Sprintf("%s", displayText),
				true,
				false,
			)
			if err != nil {
				log.Warn().Err(err).Msg("An error occurred when trying notify user.")
			}
		}
	}
}

func EditEvent(event models.Event) (models.Event, error) {
	if err := database.C.Save(&event).Error; err != nil {
		return event, err
	}
	return event, nil
}

func DeleteEvent(event models.Event) (models.Event, error) {
	if err := database.C.Delete(&event).Error; err != nil {
		return event, err
	}
	return event, nil
}