const { Structures } = require('discord.js');

const escapeRegex = require('escape-string-regexp');
const emojis = require('../../util/emojis.json');

const { Util, Emojis } = require('../../util/');
const { stripIndents } = require('common-tags')

const Message = Structures.extend('Message', (Message) => {

    class ExtendedMessage extends Message {

        constructor(...args) {

            super(...args);

            this.command = null; //Will set to command if the message induces a command.
            this.arguments = null;
            this.parameters = null;

            this._pending = null;

        }

        format(index, parameters = { }, code = false) {

            let language = 'en_us';
            if(this.guild && this.guild._settings.locale) language = this.guild._settings.locale;

            parameters.prefix = this.guild?.prefix;
            let template = this.client.localeLoader.template(language, index); //.languages[language][index];

            for(const emoji of Object.keys(Emojis)) {
                parameters[`emoji_${emoji}`] = Emojis[emoji];
            }

            if(!template) {
                return `**Missing language index \`${language} [${index}]\` in languages. Contact a bot developer about this.**`;
            }

            for (const [param, val] of Object.entries(parameters)) {
                template = template.replace(new RegExp(`{${escapeRegex(param.toLowerCase())}}`, 'gi'), val);
            }

            if(code) {
                try {
                    template = eval(template);
                } catch(error) {
                    this.command.client.logger.error(`Error in locale ${language}:${index} while executing code.\n${error.stack || error}`);
                }
            }

            return template;

        }

        async resolve() {

            console.log(this.parameters);

            if (this.command.showUsage && !this.parameters.length && !Object.values(this.arguments).length) {
                return this._showUsage();
            }

            try {
                const resolved = this.command.execute(this, {
                    params: this.parameters,
                    args: this.arguments
                });
                if(resolved instanceof Promise) await resolved;
                return { error: false };
            } catch(error) {
                return { error: true, message: error.stack || error };
            }

        }

        async embed(embed, opts = {}) {

            if (!embed.color) embed.color = 619452;
            let send = { content: opts.reply ? `<@${this.author.id}>` : '', embed };
            this._pending = await this.channel.send(send);
            return this._pending;

        }

        async respond(str, opts = { attachments: [] }) {

            if(typeof str === 'string') {
                if(opts.emoji) {
                    const emoji = emojis[opts.emoji];
                    if(!emoji) this.command.client.logger.warn(`Invalid emoji provided to command ${this.command.resolveable}: "${opts.emoji}".`);
                    str = `${emoji} ${str}`;
                }
                if(opts.reply) str = `<@!${this.author.id}> ${str}`;
            }

            //console.log(str)
            this._pending = await this.channel.send(str, { files: opts.attachments });
            return this._pending;

        }

        async edit(str, opts) {
            if(!this.editable) return null;
            if(typeof str === 'string') {
                if(opts.emoji) str = `${emojis[opts.emoji]} ${str}`;
                if(opts.reply) str = `<@!${this.author.id}> ${str}`;
            }
            return super.edit(str);
        }

        async prompt(str, opts) {
            if(typeof str === 'string') {
                if(opts.emoji) str = `${emojis[opts.emoji]} ${str}`;
                if(opts.reply) str = `<@!${this.author.id}> ${str}`;
            }
            await this.channel.send(str);
            return await this.channel.awaitMessages(m => m.author.id === this.author.id, { max: 1, time: 30000, errors: ['time'] })
                .then((collected) => {
                    return collected.first();
                })
                .catch((error) => {
                    return null;
                });
        }

        async _showUsage(comp = null) {

            const component = comp
                ? comp
                : this.command;

            const prefix = this.guild?.prefix;

            let fields = [];
            if(component.examples.length > 0) {
                fields.push({
                    name: `》${this.format('GENERAL_EXAMPLES')}`,
                    value: component.examples.map(e=>`\`${prefix}${component.name} ${e}\``).join('\n')
                });
            }
            if(component.aliases.length > 0) {
                fields.push({
                    name: `》${this.format('GENERAL_ALIASES')}`,
                    value: component.aliases.map(a=>`\`${a}\``).join(', ')
                }); 
            }
            if(component.arguments.length > 0) {
                fields.push({
                    name: `》${this.format('GENERAL_ARGUMENTS')}`,
                    value: component.arguments.map(a=>`${a.name}: ${this.format(`A_${a.name.toUpperCase()}_${component.name.toUpperCase()}_DESCRIPTION`)}`)
                });
            }

            let embed = {
                author: {
                    name: `${component.name}${component.module ? ` (${component.module.resolveable})` : ''}`,
                    icon_url: this.client.user.displayAvatarURL()
                },
                description: stripIndents`\`${prefix}${component.name}${component.usage ? ` ${component.usage}` : ''}\`
                    ${this.format(component.description)}${component.guildOnly ? ' *(guild-only)*' : ''}`,
                fields
            };
            
            return await this.embed(embed);
        }

        get prefix() {
            return this.guild
                ? this.guild.prefix
                : this.author.prefix;
        }

    }

    return ExtendedMessage;

});

module.exports = Message;