const Discord = require('discord.js');
const math = require(`mathjs`);
const { MessageActionRow, MessageButton } = require('discord.js');

module.exports = {
    name: "calculator",
    aliases: ["Calculator", "CALCULATOR"],
    dmOnly: false, //or false
    guildOnly: true, //or false
    args: false, //or false
    usage: '',
    cooldown: 60, //seconds(s)
    guarded: false, //or false
    clientpermissions: ["SEND_MESSAGES", "EMBED_LINKS", "MANAGE_MESSAGES"],
    async execute(client, message, args) {
        let button = new Array([], [], [], [], []);
        let row = [];
        let text = ["clear", "(", ")", "/", "7", "8", "9", "*", "4", "5", "6", "-", "1", "2", "3", "+", ".", "0", "00", "="];
        let current = 0;

        for (let i = 0; i < text.length; i++) {
            if (button[current].length === 4) current++;
            button[current].push(createButton(text[i]));
            if (i === text.length - 1) {
                for(let btn of button) row.push(addRow(btn));
            }
        }


        // embed message
        const embed = new Discord.MessageEmbed()
        .setAuthor(message.author.tag, message.author.displayAvatarURL())
        .setDescription("```0```")
        
        message.channel.send({
            embeds: [embed],
            components: [row]
        }).then((msg) => {
            
            let isWrong = false;
            let time = 60000;
            let value = "";
            let embed1 = new Discord.MessageEmbed()
            .setAuthor(message.author.tag, message.author.displayAvatarURL())


            function createCollector(val, result = false) {
                let filter = (buttons1) => buttons1.clicker.user.id === message.author.id && buttons1.id === "cal" + val;
                let collect = msg.createButtonCollector(filter, { time: time});

                collect.on("collect", async x => {
                    x.reply.defer();

                    if (result === "new") value = "0"
                    else if (isWrong) {
                        value = val
                        isWrong = false;
                    }
                    else if (value === "0") value = val;
                    else if (result) {
                        isWrong = true;
                        value = mathEval(value);
                    }
                    else value += val

                    embed1.setDescription("```" + value + "```")
                    msg.edit({
                        embed: embed1,
                        components: row
                    })

                })
            }

            for(let txt of text) {
                let result;
                if (txt === "clear") result = "new";
                else if (txt === "=") result = true;
                else result = false
                createCollector(txt, result)
            
            }

            setTimeout(() => {
                embed1.setDescription("Your time for using calculator is running out")
                embed1.setColor("RED")
                msg.edit({
                    embed: [embed1]
                })
            }, time)

        })

        // function
        function addRow(btns) {
            let row1 = new MessageActionRow()

            for(let btn of btns) {
                row1.addComponents(btn);
            }
            return row1;
        }

        function createButton(label, style = "SECONDARY") {

            if (label === "clear") style = "DANGER"
            else if (label === ".") style = "SECONDARY"
            else if (label === "=") style = "SUCCESS"
            else if (isNaN(label)) style = "PRIMARY"

            const btn = new MessageButton()
            .setLabel(label)
            .setStyle(style)
            .setCustomId("cal" + label)
            return btn;
        }
        function mathEval(input) {
            try {
              let res = math.evaluate(input)
              return res
            } catch {
                return "Wrong input!";
            }
        }
}
}