package main

import (
	"fmt"
	"strings"
	"sync"
	"time"

	"github.com/bwmarrin/discordgo"
)

const starEmoji = "⭐"
const starChannel = "645551408283648000"

var starboardMutex sync.Mutex

func listenToStarboardReact(s *discordgo.Session, m *discordgo.MessageReactionAdd) {
	if m.ChannelID == starChannel {
		return
	}
	if m.Emoji.Name != starEmoji {
		return
	}
	messageTimestamp, err := discordgo.SnowflakeTimestamp(m.MessageID)
	if err != nil {
		logError(s, "listenToStarboardReact", "snowflakeTimestamp", m.MessageID, err)
		return
	}
	if time.Now().Sub(messageTimestamp) > 24*time.Hour {
		return
	}
	starboardMutex.Lock()
	defer starboardMutex.Unlock()

	if checkStarredBefore(s, m.MessageID) {
		return
	}

	reacter, err := s.MessageReactions(m.ChannelID, m.MessageID, starEmoji, 5)
	if err != nil {
		logError(s, "listenToStarboardReact", "messageReactions", m.ChannelID, m.MessageID, err)
		return
	}
	if len(reacter) < 3 {
		return
	}

	msg, err := s.ChannelMessage(m.ChannelID, m.MessageID)
	if err != nil {
		logError(s, "listenToStarboardReact", "channelMessage", m.ChannelID, m.MessageID, err)
		return
	}

	color := s.State.UserColor(msg.Author.ID, m.ChannelID)
	if color == 0 {
		//White as fallback
		color = 0xFFFFFF
	}

	content := msg.Content[:1000]
	//Up to 10 line
	splittedContent := strings.SplitN(content, "\n", 11)
	content = strings.Join(splittedContent[:10], "\n")
	if len(splittedContent) > 10 || len(content) > 1000 {
		content += "..."
	}
	content += fmt.Sprintf(
		"\n\n[Original Message](https://discordapp.com/channels/%s/%s/%s)",
		m.GuildID, m.ChannelID, m.MessageID,
	)

	msg, err = s.ChannelMessageSendEmbed(
		starChannel,
		&discordgo.MessageEmbed{
			Title:       "Starred Message",
			Description: content,
			Color:       color,
			Timestamp:   messageTimestamp.Format(time.RFC3339),
			Author: &discordgo.MessageEmbedAuthor{
				Name:    msg.Author.Username + "#" + msg.Author.Discriminator,
				IconURL: "https://cdn.discordapp.com/avatars/" + msg.Author.ID + "/" + msg.Author.Avatar + ".png",
			},
		},
	)
	if err != nil {
		logError(s, "listenToStarboardReact", "channelMessageSendEmbed", err)
		return
	}
	err = s.MessageReactionAdd(msg.ChannelID, msg.ID, starEmoji)
	noteStarred(s, msg.ID)
	if err != nil {
		logError(s, "listenToStarboardReact", "messageReactionAdd", err)
	}
}

func checkStarredBefore(s *discordgo.Session, discordID string) bool {
	rows, err := db.Query("SELECT id FROM starred WHERE id=?", discordID)
	if err != nil {
		logError(s, "checkStarredBefore", "query", err)
		return true
	}
	defer rows.Close()
	return rows.Next()
}

func noteStarred(s *discordgo.Session, discordID string) {
	_, err := db.Exec("INSERT INTO starred(id) VALUES(?)", discordID)
	if err != nil {
		logError(s, "noteStarred", "exec", err)
	}
}