package main

import (
	"errors"
	"fmt"

	"github.com/mattermost/focalboard/server/services/notify"
	"github.com/mattermost/focalboard/server/services/notify/notifymentions"
	"github.com/mattermost/focalboard/server/services/notify/plugindelivery"

	pluginapi "github.com/mattermost/mattermost-plugin-api"

	"github.com/mattermost/mattermost-server/v6/model"

	"github.com/mattermost/mattermost-server/v6/shared/mlog"
)

const (
	botUsername    = "boards"
	botDisplayname = "Boards"
	botDescription = "Created by Boards plugin."
)

func createMentionsNotifyBackend(client *pluginapi.Client, serverRoot string, logger *mlog.Logger) (notify.Backend, error) {
	bot := &model.Bot{
		Username:    botUsername,
		DisplayName: botDisplayname,
		Description: botDescription,
	}
	botID, err := client.Bot.EnsureBot(bot)
	if err != nil {
		return nil, fmt.Errorf("failed to ensure %s bot: %w", botDisplayname, err)
	}

	pluginAPI := &pluginAPIAdapter{client: client}

	delivery := plugindelivery.New(botID, serverRoot, pluginAPI)

	backend := notifymentions.New(delivery, logger)

	return backend, nil
}

type pluginAPIAdapter struct {
	client *pluginapi.Client
}

func (da *pluginAPIAdapter) GetDirectChannel(userID1, userID2 string) (*model.Channel, error) {
	return da.client.Channel.GetDirect(userID1, userID2)
}

func (da *pluginAPIAdapter) CreatePost(post *model.Post) error {
	return da.client.Post.CreatePost(post)
}

func (da *pluginAPIAdapter) GetUserByID(userID string) (*model.User, error) {
	return da.client.User.Get(userID)
}

func (da *pluginAPIAdapter) GetUserByUsername(name string) (*model.User, error) {
	return da.client.User.GetByUsername(name)
}

func (da *pluginAPIAdapter) GetTeamMember(teamID string, userID string) (*model.TeamMember, error) {
	return da.client.Team.GetMember(teamID, userID)
}

func (da *pluginAPIAdapter) GetChannelByID(channelID string) (*model.Channel, error) {
	return da.client.Channel.Get(channelID)
}

func (da *pluginAPIAdapter) GetChannelMember(channelID string, userID string) (*model.ChannelMember, error) {
	return da.client.Channel.GetMember(channelID, userID)
}

func (da *pluginAPIAdapter) IsErrNotFound(err error) bool {
	return errors.Is(err, pluginapi.ErrNotFound)
}