const { MessageAttachment } = require('discord.js');
const { Command } = require('../../../../interfaces');

const { PermissionNames } = require('../../../../../util/Constants.js');
const { stripIndents } = require('common-tags');

class SettingsCommand extends Command {

    constructor(client) {

        super(client, {
            name: 'settings',
            module: 'administration',
            aliases: [
                'setting',
                'set'
            ],
            usage: "['list'|'reset'|setting] [value..]",
            arguments: [
                {
                    name: 'export',
                    type: 'BOOLEAN',
                    types: ['FLAG'],
                    default: true
                },
                {
                    name: 'user',
                    type: 'BOOLEAN',
                    types: ['VERBAL', 'FLAG'],
                    default: true
                },
                {
                    name: 'all',
                    type: 'BOOLEAN',
                    types: ['VERBAL', 'FLAG'],
                    default: true,
                    archivable: false
                }
            ],
            showUsage: true,
            examples: [
                'prefix !',
                'modlogs #channel'
            ],
            throttling: {
                usages: 2,
                duration: 5
            }
        });

        this.client = client;


    }

    async execute(message, { params, args }) {
        
        const type = !message.guild || args.user ? 'USER' : 'GUILD';
        if(type === 'GUILD') {
            const permissions = this.client.permissions.execute(message, message.command, ['ADMINISTRATOR', 'MANAGE_GUILD']);
            if(permissions.error) return message.respond(message.format('C_SETTINGS_MISSINGPERMISSIONS'), {
                emoji: 'failure'
            });
        }

        if(args.export) return this._exportSettings(message, type);

        if(params.length === 0) return message.embed(this.usageEmbed(message));
        const target = params[0].toLowerCase(); //params[0] should never be null
        
        if(target === 'list') {
            return this._listSettings(message, type, Boolean(args.all));
        } else if(target === 'reset') {
            const prompt = await message.prompt(message.format('C_SETTINGS_RESETPROMPT', { type: message.format('C_SETTINGS_FORMATTYPE', { type }, true) }), {
                emoji: 'warning'
            });
            if(!prompt) return undefined;
            const boolean = this.client.resolver.resolveBoolean(prompt.content.toLowerCase());
            if(boolean === null) {
                return message.respond(message.format('C_SETTINGS_RESETINVALID'), {
                    emoji: 'failure'
                });
            } else if(!boolean) {
                return message.respond(message.format('C_SETTINGS_RESETABORT'), {
                    emoji: 'success'
                });
            }

            return this._resetSettings(message, type);
        }

        const settings = this.client.resolver.components(target, 'setting', true).sort((c) => c.resolve === type);
        if(settings.length === 0) {
            return message.respond(message.format('C_SETTINGS_SETTINGNOTFOUND'), {
                emoji: 'failure'
            });
        }

        const [ setting ] = settings;
        message._settingCaller = target;

        const parameters = params.splice(1);
        if(parameters.length === 0) {
            return this._showSetting(message, setting);
        }

        if(setting.resolve === 'GUILD') {
            if(setting.clientPermissions.length > 0) {
                const missing = message.guild.permissionsFor(message.guild.me).missing(setting.clientPermissions);
                if(missing.length > 0) {
                    await message.respond(message.format('C_SETTINGS_MISSINGCLIENTPERMISSIONS', { permissions: missing.map((m) => `\`${PermissionNames[m]}\``).join(', ') }));
                }
            }
        }

        if(parameters.join(' ').toLowerCase() === 'reset') {
            return this._resetSetting(message, setting);
        }

        if(setting.premium > message.guild.premium && !message.author.developer) {
            return message.respond(message.format('C_SETTINGS_PREMIUM', { current: message.guild.premium, required: setting.premium }), {
                emoji: 'failure'
            });
        }

        const response = await setting.handle(message, parameters);
        if(response.ignore) return undefined;
        
        message.respond(response.msg, { 
            emoji: response.error ? 'failure' : 'success', 
            embed: response.embed || null 
        });

    }

    async _listSettings(message, type, all = false) {

        const prefix = message?.guild?.prefix 
            || this.client._options.bot.prefix;

        const fields = [];
        const sorted = this.client.registry.components
            .filter((c) => c.type === 'module')
            .sort((a, b) => {
                const filter = (c) => c.type === 'setting';
                return b.components.filter(filter).size - a.components.filter(filter).size; 
            });

        for(const module of sorted.values()) {
            const field = {
                name: module.id,
                value: '',
                inline: true
            };

            for(const setting of module.components.values()) {
                if(setting.type !== 'setting'
                    || type !== setting.resolve
                    || !setting.archivable && !all) continue;
                field.value += `\`${message.author._settings.camelCase ? setting.name : setting.name.toLowerCase()}\`\n`;
            }
            if(field.value) fields.push(field);
        }
        
        for(let i = 0; i < fields.length % 3; i++) {
            fields.push({
                name: '\u200b',
                value: '\u200b',
                inline: true
            });
        }

        const embed = {
            author: {
                name: `${type === 'GUILD' ? message.format('C_SETTINGS_GUILDSETTINGSTITLE') : message.format('C_SETTINGS_USERSETTINGSTITLE')}`,
                icon_url: type === 'GUILD' ? message.guild.iconURL() : message.author.displayAvatarURL() //eslint-disable-line camelcase
            },
            description: stripIndents`${message.format('C_SETTINGS_LISTSETTINGS', { prefix })}

            ${type === 'USER' ? '' : message.format('C_SETTINGS_LISTSETTINGSALT', { prefix })}`,
            fields
        };

        return message.embed(embed);

    }

    async _showSetting(message, setting) {

        const embed = setting.usageEmbed(message);

        let dataFields = setting.fields(message.guild);
        if(dataFields instanceof Promise) dataFields = await dataFields;

        embed.fields = embed.fields.concat(dataFields);
        embed.author.icon_url = setting.resolve === 'GUILD' ? message.guild.iconURL() : message.author.displayAvatarURL(); //eslint-disable-line camelcase

        return message.embed(embed);

    }

    async _exportSettings(message, type) {

        const settings = type === 'USER'
            ? await message.author.settings()
            : await message.guild.settings();

        const string = JSON.stringify(settings);
        const attachment = new MessageAttachment(Buffer.from(string), 'settings.json');

        return message.respond(message.format('C_SETTINGS_EXPORT'), {
            emoji: 'success',
            files: [ attachment ]
        });

    }

    async _resetSettings(message, type) { //Reset ALL settings.
        if(type === 'USER') {
            await message.author._resetSettings();
        } else {
            await message.guild._resetSettings();
        }

        return message.respond(message.format('C_SETTINGS_RESETSUCCESS', { type: message.format('C_SETTINGS_FORMATTYPE', { type }, true) }), {
            emoji: 'success'
        });
    }

    async _resetSetting(message, setting) { //Reset an INDIVIDUAL setting.
        const { error, response } = await setting._handleReset(message);
        if(error) {
            return message.respond(message.format('C_SETTINGS_RESETSETTINGFAIL'), {
                emoji: 'failure'
            });
        }

        return message.respond(response, {
            emoji: 'success'
        });
    }


}

module.exports = SettingsCommand;