import { Command } from 'discord-akairo';
import { Message } from 'discord.js';
import { colour } from '../../Config';

export default class HelpUtil extends Command {
    public constructor() {
        super('help', {
            aliases: ['help'],
            category: 'utility',
            description: {
                content: 'List help features or get information on a specified command.',
                usage: '[command]',
                examples: [
                    '',
                    '8ball'
                ]
            },
            ratelimit: 3,
            clientPermissions: ['EMBED_LINKS'],
            args: [
                {
                    id: 'command',
                    type: 'commandAlias',
                    prompt: {
                        start: 'Which command do you need help with?',
                        retry: 'Please provide a valid command.',
                        optional: true
                    },
                    match: 'rest'
                }
            ]
        });
    }
    
    public exec(msg: Message, { command }): Promise<void | Message> {
        if (!command) {
            const embed = this.client.util.embed()
                .setColor(colour)
                .addFields([
                    {
                        name: 'Online Command List',
                        value: '*Coming soon!*'
                    },
                    {
                        name: 'Specific Command Help',
                        value: `${this.handler.prefix}help <command>`
                    },
                    {
                        name: 'List of all public categories',
                        value: `${this.handler.prefix}categories`
                    }
                ]);
            return msg.channel.send({ embed });
        }
        
        const description = Object.assign({
            content: 'No description available.',
            usage: '',
            examples: [],
            fields: []
        }, command.description);
        
        const embed = this.client.util.embed()
            .setColor(colour)
            .setTitle(`\`${this.client.commandHandler.prefix}${command.aliases[0]} ${description.usage}\``)
            .addField('Description', description.content);
            
        for (const field of description.fields) embed.addField(field.name, field.value);
        
        if (command.aliases.length > 1) {
			embed.addField('Aliases', `\`${command.aliases.join('`, `')}\``, true);
        }
        
        if (command.description.examples.length >= 1) {
            embed.addField('Examples', `\`${this.client.commandHandler.prefix}${command.aliases[0]} ${command.description.examples.join(`, ${this.client.commandHandler.prefix}${command.aliases[0]} `)}\``, true);
        }

		if (command.userPermissions) {
			embed.addField('User permission', `\`${command.userPermissions.join('` `')}\``, true);
		}

		if (command.clientPermissions) {
			embed.addField('Bot permission', `\`${command.clientPermissions.join('` `')}\``, true);
		}

		if (command.contentParser.flagWords.length) {
			embed.addField('Command flags', `\`${command.contentParser.flagWords.join('` `')}\``, true);
		}

		if (command.contentParser.optionFlagWords.length) {
			embed.addField('Command options flags', `\`${command.contentParser.optionFlagWords.join('` `')}\``, true);
		}

        if (msg.channel.type === 'dm') return msg.author.send({ embed });
        return msg.reply('Sending you a DM with information...').then(async m => {
            await msg.author.send({ embed });
            m.edit('I\'ve send you a DM with information!');
        });
    }
}