package commands

import (
	"fmt"
	"math"
	"time"

	"github.com/bwmarrin/discordgo"

	"PermissionGacha/db"
	"PermissionGacha/modules/config"
	"PermissionGacha/modules/level"
	"PermissionGacha/modules/log"
	"PermissionGacha/modules/roles"
)

const emojiCheck = "✅"

var prestigeList = make(map[string]string)

func handlePrestigeCommand(s *discordgo.Session, args []string, m *discordgo.MessageCreate) error {
	//TODO: Factorize into backend parts
	currentPrestigeLevel, err := db.GetPrestigeMultiplier(m.Author.ID)
	if err != nil {
		return fmt.Errorf("commands: handlePrestigeCommand: error while getting current prestige level: %w", err)
	}
	xp, err := db.GetXP(m.Author.ID)
	if err != nil {
		return fmt.Errorf("commands: handlePrestigeCommand: error while getting current XP: %w", err)
	}
	newPrestigeLevel := xp/config.PrestigeRequirement + 1

	currentLevel, _ := level.ConvertXPIntoLevel(xp)

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

	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(config.PrestigeRequirement*(nextNearestLogicalPrestige-1))*100,
			lowerLevelWarning,
		),
	)
	if err != nil {
		return fmt.Errorf("commands: handlePrestigeCommand: error while sending message: %w", err)
	}
	prestigeList[msg.ID] = m.Author.ID
	err = s.MessageReactionAdd(msg.ChannelID, msg.ID, emojiCheck)
	if err != nil {
		return fmt.Errorf("commands: handlePrestigeCommand: error while adding reaction: %w", err)
	}

	time.Sleep(15 * time.Second)
	delete(prestigeList, msg.ID)
	err = s.MessageReactionsRemoveAll(msg.ChannelID, msg.ID)
	if err != nil {
		return fmt.Errorf("commands: handlePrestigeCommand: error while removing reaction: %w", err)
	}
	return nil
}

func ListenPrestigeReact(s *discordgo.Session, m *discordgo.MessageReactionAdd) {
	if prestigeList[m.MessageID] != m.UserID {
		return
	}
	if m.Emoji.Name != emojiCheck {
		return
	}
	xp, err := db.GetXP(m.UserID)
	if err != nil {
		log.Error(s, "checkPrestigeReact", "GetXP", err)
		return
	}
	newPrestigeLevel := xp/config.PrestigeRequirement + 1
	go roles.RemoveAllLevelRoles(s, m.UserID)
	err = db.SetPrestigeMultiplier(m.UserID, newPrestigeLevel)
	if err != nil {
		log.Error(s, "checkPrestigeReact", "SetPrestigeMultiplier", err)
		return
	}
	s.ChannelMessageSend(m.ChannelID,
		fmt.Sprintf(
			"**PRESTIGE > ** <@%s>, you have prestiged!", m.UserID,
		),
	)
}