package services

import (
	"fmt"

	"git.solsynth.dev/hydrogen/messaging/pkg/database"
	"git.solsynth.dev/hydrogen/messaging/pkg/models"
	"github.com/rs/zerolog/log"
	"github.com/samber/lo"
)

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

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

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

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

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

func NewMessage(message models.Message) (models.Message, error) {
	var members []models.ChannelMember
	if err := database.C.Save(&message).Error; err != nil {
		return message, err
	} else if err = database.C.Where(models.ChannelMember{
		ChannelID: message.ChannelID,
	}).Preload("Account").Find(&members).Error; err == nil {
		channel := message.Channel
		message, _ = GetMessage(message.Channel, message.ID)
		for _, member := range members {
			if member.ID != message.Sender.ID {
				switch member.Notify {
				case models.NotifyLevelNone:
					continue
				case models.NotifyLevelMentioned:
					if member.ID == message.ReplyTo.SenderID {
						break
					}
					if val, ok := message.Content["mentioned_users"]; ok {
						if usernames, ok := val.([]string); ok {
							if lo.Contains(usernames, member.Account.Name) {
								break
							}
						}
					}
					continue
				default:
					break
				}

				var displayText string
				if message.Content["algorithm"] == "plain" {
					displayText, _ = message.Content["value"].(string)
				} else {
					displayText = "*encrypted message*"
				}

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

				err = NotifyAccountMessager(member.Account,
					fmt.Sprintf("%s in #%s", message.Sender.Account.Nick, channel.Alias),
					fmt.Sprintf("%s", displayText),
					true,
					false,
				)
				if err != nil {
					log.Warn().Err(err).Msg("An error occurred when trying notify user.")
				}
			}
			PushCommand(member.AccountID, models.UnifiedCommand{
				Action:  "messages.new",
				Payload: message,
			})
		}
	}

	return message, nil
}

func EditMessage(message models.Message) (models.Message, error) {
	var members []models.ChannelMember
	if err := database.C.Save(&message).Error; err != nil {
		return message, err
	} else if err = database.C.Where(models.ChannelMember{
		ChannelID: message.ChannelID,
	}).Find(&members).Error; err == nil {
		message, _ = GetMessage(models.Channel{
			BaseModel: models.BaseModel{ID: message.Channel.ID},
		}, message.ID)
		for _, member := range members {
			PushCommand(member.AccountID, models.UnifiedCommand{
				Action:  "messages.update",
				Payload: message,
			})
		}
	}

	return message, nil
}

func DeleteMessage(message models.Message) (models.Message, error) {
	prev, _ := GetMessage(models.Channel{
		BaseModel: models.BaseModel{ID: message.Channel.ID},
	}, message.ID)

	var members []models.ChannelMember
	if err := database.C.Delete(&message).Error; err != nil {
		return message, err
	} else if err = database.C.Where(models.ChannelMember{
		ChannelID: message.ChannelID,
	}).Find(&members).Error; err == nil {
		for _, member := range members {
			PushCommand(member.AccountID, models.UnifiedCommand{
				Action:  "messages.burnt",
				Payload: prev,
			})
		}
	}

	return message, nil
}