package confession

import (
	"errors"
	"fmt"
	"sync"

	"github.com/bwmarrin/discordgo"
	"gitlab.com/whom/bingobot/internal/logging"
	"gitlab.com/whom/bingobot/internal/state"
)

/* Activity module
 * This module posts anonymous confessions according to a linked channel map
 */

const (
	ActivityModuleStartFail = "failed to start activity module"
)

var (
	// guild ID to channel ID
	linkLock               sync.RWMutex
	confessionChannelLinks = make(map[string]state.ConfessionsChannelLinkEvent)
)

func Start() error {
	ch, err := state.ConfessionsChannelLink.Subscribe()
	if err != nil {
		return errors.Join(
			errors.New(ActivityModuleStartFail),
			err,
		)
	}

	// process incoming events loop
	go func() {
		for {
			ev := <- ch
			logging.Debug("recieved new confessional channel link")
			e := ev.(state.ConfessionsChannelLinkEvent)
			linkLock.Lock()
			confessionChannelLinks[e.GuildID] = e
			linkLock.Unlock()
		}
	}()

	return nil
}

func MakeConfession(s *discordgo.Session, guildID string, content string) {
	linkLock.RLock()
	link, ok := confessionChannelLinks[guildID]
	linkLock.RUnlock()
	if !ok {
		logging.Error(fmt.Sprintf("Failed to send confession in guild %s: no link exists in map", guildID))
		return
	}
	s.ChannelMessageSend(link.ChannelID, content)
}