package active

import (
	"math"
	"sync"
	"time"

	"github.com/bwmarrin/discordgo"

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

var lastMessage = make(map[string]time.Time)
var incrementMutex = sync.Mutex{}

func Reward(s *discordgo.Session, m *discordgo.MessageCreate) {
	if m.Author.Bot {
		return
	}

	amountToIncrement := calculateIncrement(m.Author.ID)
	if m.ChannelID != config.GeneralChannelID {
		amountToIncrement /= config.NotInGeneralNerf
	}
	multiplier, err := db.GetPrestigeMultiplier(m.Author.ID)
	if err != nil {
		log.Error(s, err)
		return
	}
	amountToIncrement *= multiplier

	err = db.IncrementXP(m.Author.ID, amountToIncrement)
	if err != nil {
		log.Error(s, err)
		return
	}
	level.QueueCheck(m.Author.ID)
}

func calculateIncrement(discordID string) int {
	incrementMutex.Lock()
	defer incrementMutex.Unlock()

	now := time.Now()
	delta := now.Sub(lastMessage[discordID])
	lastMessage[discordID] = now

	if delta.Seconds() < 0 {
		return 0
	}

	//Constructed on Desmos:
	//y=\frac{100}{\left(1+e^{-\left(\frac{x}{2}-5\right)}\right)}
	return int(100 / (1 + math.Pow(math.E, -((delta.Seconds()/2)-5))))
}