package main

import (
	"crypto/rand"
	"fmt"
	"math"
	"strings"
	"time"

	"github.com/bwmarrin/discordgo"
)

const generalChannelID = "645550570001924098"
const emojiCheck = "✅"
const prestigeRequirement = 90000

var prestigeList = make(map[string]string)

func messageCreate(s *discordgo.Session, m *discordgo.MessageCreate) {
	if m.Author.Bot {
		return
	}
	go incrementXP(s, m.Author.ID, m.ChannelID == generalChannelID)

	if m.Content == "pgqlevel" {
		handleXPRequest(s, m)
	}
	if m.Content == "pgqshard" {
		handleShardRequest(s, m)
	}
	if m.Content == "pgqprestige" {
		handlePrestigeRequest(s, m)
	}
	if strings.HasPrefix(m.Content, "pgqstar ") {
		handleStarRequest(s, m)
	}
}

func handleXPRequest(s *discordgo.Session, m *discordgo.MessageCreate) {
	level, rawXP := getLevelAndXP(s, m.Author.ID)
	randomSource := make([]byte, 1)
	rand.Read(randomSource)
	xp := rawXP - (rawXP % 100) + ((int(randomSource[0]) + 128) % 100)
	levelUpRequirement := levelUpRequirementCache[level-1]
	if level > 1 {
		levelUpRequirement -= levelUpRequirementCache[level-2]
	}
	s.ChannelMessageSend(
		m.ChannelID,
		fmt.Sprintf(
			"<@%s> is now level %d. (%d XP/%d XP) [%.1f%%]",
			m.Author.ID, level, xp, levelUpRequirement, float64(xp)/float64(levelUpRequirement)*100,
		),
	)
}

func handleShardRequest(s *discordgo.Session, m *discordgo.MessageCreate) {
	shard := getShard(s, m.Author.ID)
	s.ChannelMessageSend(
		m.ChannelID,
		fmt.Sprintf(
			"<@%s> has %d shards.",
			m.Author.ID, shard,
		),
	)
}

func handlePrestigeRequest(s *discordgo.Session, m *discordgo.MessageCreate) {
	currentPrestigeLevel := getPrestige(s, m.Author.ID)
	xp := getXP(s, m.Author.ID)
	newPrestigeLevel := xp/prestigeRequirement + 1

	if xp < levelUpRequirementCache[3] && currentPrestigeLevel == 1 {
		s.ChannelMessageSend(m.ChannelID, "**PRESTIGE > **Prestige is only unlocked after level 5!")
		return
	}

	var lowerLevelWarning string
	if newPrestigeLevel <= currentPrestigeLevel {
		lowerLevelWarning = "**WARNING:** *Your new prestige multiplier is __NOT__ higher than your current prestige multiplier.*"
	}
	nearestPowerOfTen := math.Pow10(int(math.Floor(math.Log10(float64(newPrestigeLevel)))))
	nextNearestLogicalPrestige := int((math.Floor(float64(newPrestigeLevel)/nearestPowerOfTen) + 1) * nearestPowerOfTen)

	msg, err := s.ChannelMessageSend(
		m.ChannelID,
		fmt.Sprintf(
			"<@%s>, here's your prestige multiplier:\n**Now: **__%dx__\n**New: **__%dx__\n**Next: **__%dx__ [%.1f%%]\n%s\n"+
				"React with :white_check_mark: to proceed with prestiging.",
			m.Author.ID,
			currentPrestigeLevel,
			newPrestigeLevel,
			nextNearestLogicalPrestige, float64(xp)/float64(prestigeRequirement*(nextNearestLogicalPrestige-1))*100,
			lowerLevelWarning,
		),
	)
	if err != nil {
		logError(s, "handlePrestigeRequest", "send", err)
		return
	}
	prestigeList[msg.ID] = m.Author.ID
	err = s.MessageReactionAdd(msg.ChannelID, msg.ID, emojiCheck)
	if err != nil {
		logError(s, "handlePrestigeRequest", "addReaction", err)
		return
	}
	go func() {
		time.Sleep(15 * time.Second)
		err = s.MessageReactionsRemoveAll(msg.ChannelID, msg.ID)
		if err != nil {
			logError(s, "handlePrestigeRequest", "removeReaction", err)
		}
	}()
}

func checkPrestigeReact(s *discordgo.Session, m *discordgo.MessageReactionAdd) {
	if prestigeList[m.MessageID] != m.UserID {
		return
	}
	if m.Emoji.Name != emojiCheck {
		return
	}
	xp := getXP(s, m.UserID)
	newPrestigeLevel := xp/prestigeRequirement + 1
	go cleanUpRole(s, m.UserID)
	setPrestige(s, m.UserID, newPrestigeLevel)
	s.ChannelMessageSend(m.ChannelID,
		fmt.Sprintf(
			"**PRESTIGE > ** <@%s>, you have prestiged!", m.UserID,
		),
	)
}

func handleStarRequest(s *discordgo.Session, m *discordgo.MessageCreate) {
	commandSplit := strings.SplitN(m.Content, " ", 2)
	if len(commandSplit) == 1 {
		s.ChannelMessageSend(m.ChannelID, "**STAR > **It doesn't seem like you've sent a valid message link!")
		return
	}
	linkSplit := strings.SplitN(m.Content, "/", 7)
	if len(linkSplit) < 7 {
		s.ChannelMessageSend(m.ChannelID, "**STAR > **It doesn't seem like you've sent a valid message link!")
		return
	}
	if linkSplit[0] != "https" && linkSplit[0] != "http" {
		s.ChannelMessageSend(m.ChannelID, "**STAR > **It doesn't seem like you've sent a valid message link!")
		return
	}
	if linkSplit[2] != "discordapp.com" && !strings.HasSuffix(linkSplit[2], ".discordapp.com") {
		s.ChannelMessageSend(m.ChannelID, "**STAR > **It doesn't seem like you've sent a valid message link!")
		return
	}
	if linkSplit[3] != "channels" {
		s.ChannelMessageSend(m.ChannelID, "**STAR > **It doesn't seem like you've sent a valid message link!")
		return
	}
	if linkSplit[4] != m.GuildID {
		s.ChannelMessageSend(m.ChannelID, "**STAR > **It doesn't seem like you've sent a valid message link!")
		return
	}
	err := s.MessageReactionAdd(linkSplit[5], linkSplit[6], starEmoji)
	if err != nil {
		s.ChannelMessageSend(m.ChannelID, "**STAR > **It doesn't seem like you've sent a valid message link!")
	}
}