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

const { stripIndents } = require('common-tags');

class PermissionsCommand extends Command {

    constructor(client) {

        super(client, {
            name: 'permissions',
            module: 'administration',
            usage: "<list|role-name|user-name>",
            aliases: [
                'perms',
                'permission',
                'perm'
            ],
            examples: [
                "list",
                "Server Moderators",
                "@nolan#2887"
            ],
            arguments: [
                {
                    name: 'user',
                    aliases: ['users'],
                    type: 'BOOLEAN',
                    types: ['VERBAL', 'FLAG'],
                    default: true
                },
                {
                    name: 'raw',
                    aliases: ['json'],
                    type: 'BOOLEAN',
                    types: ['VERBAL', 'FLAG'],
                    default: true
                }
            ],
            // memberPermissions: ['ADMINISTRATOR', 'MANAGE_GUILD'],
            guildOnly: true
        });

    }

    async execute(message, { params, args }) {

        const permissions = await message.guild.permissions();
        if(args.raw) {
            await this._displayRaw(message, permissions);
            return undefined;
        }

        if(params.length === 0) {
            await this._showPermissions(message, Boolean(args.user));
            return undefined;
        }

        if(params[0] === 'list') {
            await this._listAvailablePermissions(message);
            return undefined;
        } else {
            const parameters = params.join(' ');
            let resolveable = await this._parseResolveable(message, parameters);
            if(resolveable.user) resolveable = resolveable.user;
            const type = resolveable.tag ? 'user' : 'role';
            const permission = permissions[resolveable?.id || parameters];
            if(resolveable && !permission) {
                await message.respond(message.format('C_PERMISSIONS_PERMISSIONSNOTFOUND', { resolveable: resolveable.tag || resolveable.name, type, they: type === 'user' ? 'they ' : '' }), { emoji: 'failure'});
                return undefined;
            }

            if(!permission) {
                await message.respond(message.format('C_PERMISSIONS_NOTFOUND'), { emoji: 'failure' });
                return undefined;
            }

            const embed = {
                author: {
                    name: `${resolveable?.user?.tag || resolveable?.tag || resolveable?.name || parameters}'s Permissions`,
                    icon_url: resolveable.displayAvatarURL ? resolveable.displayAvatarURL() : message.guild.iconURL()
                },
                description: `${message.format('C_PERMISSIONS_GLOBAL', { permissions: permission.global.length > 0 ? this._displayNames(permission.global).map(p=>`\`${p}\``).join(', ') : "`N/A`" })} ${Object.values(permission.channels).length > 0 ? message.format('C_PERMISSIONS_GLOBALALT') : ''}`,
                fields: []
            };

            let update = false;
            for(const [channelId, perms] of Object.entries(permission.channels)) {
                const channel = await this.client.resolver.resolveChannel(channelId, true, message.guild);
                if(!channel) {
                    delete permission.channels[channelId];
                    update = true;
                    continue;
                } else {
                    if(embed.fields.length === 25) {
                        embed.description += `\n${message.format('C_PERMISSIONS_MAXFIELDS')}`;
                        break;
                    }
                    embed.fields.push({
                        name: `#${channel.name}`,
                        value: this._displayNames(perms).map(p=>`\`${p}\``).join(', ')
                    });
                }
            }
            if(update) {
                delete permissions._id
                try {
                    await this.client.transactionHandler.send({
                        provider: 'mongodb',
                        request: {
                            type: 'updateOne',
                            collection: 'permissions',
                            query: {
                                guildId: message.guild.id
                            },
                            data: permissions
                        }
                    }); 
                } catch(error) {
                    this.client.logger.error(`Error removing channel permissions to ${message.guild.id}:\n${error.stack || error}`);
                }
            }

            return await message.embed(embed);

        }

    }

    async _showPermissions(message, user = false) {
        const embed = {
            author: {
                name: message.format('C_PERMISSIONS_SHOWTITLE', { user }, true),
                icon_url: message.guild.iconURL()
            },
            description: message.format('C_PERMISSIONS_SHOWDESCRIPTION', { resolve: user ? 'user' : 'role' }),
            fields: []
        };

        const permissions = message.guild._permissions;
        for(const [id, value] of Object.entries(permissions)) {
            if(id === '_id' || id === 'guildId') continue;
            const item = await this.client.resolver[user ? 'resolveUser' : 'resolveRole'](id, true, message.guild); //dont kill me
            if((item instanceof Role && user)
                || (!user && !(item instanceof Role))
                || !item) continue;
            if(embed.fields.length === 25) {
                embed.description += `\n${message.format('C_PERMISSIONS_MAXFIELDS')}`;
                break;
            }
            const name = item?.user?.tag || item?.tag || item?.name || id; //please dont kill me again
            const channels = Object.values(value.channels).length;
            if(channels === 0 && value.global.length === 0) {
                embed.description += `\n\n${message.format('C_PERMISSIONS_NOPERMISSIONS')}`;
                break;
            }
            embed.fields.push({
                name,
                value: stripIndents`${this._displayNames(value.global).map(n=>`\`${n}\``).join('\n')}
                    ${channels > 0 ? `\`..${channels} channel${channels === 1 ? '' : 's'}\`` : ''}`
            });
        }

        return message.embed(embed);

    }

    async _listAvailablePermissions(message) {

        const components = this.client.registry.components.filter(c=>(c.type === 'command' && c.grantable) || (c.type === 'module' && c.components.some(c=>c.type === 'command' && c.grantable)))
            .sort((a, b) => a - b);

        return await message.respond(message.format('C_PERMISSIONS_LIST', { permissions: components.map(c => `\`${c.resolveable}\``).join(', ') }), { emoji: 'success' });

    }

    async _parseResolveable(message, resolveable) {
        let parsed = await this.client.resolver.resolveRole(resolveable, false, message.guild);
        if(!parsed) {
            parsed = await this.client.resolver.resolveMember(resolveable, false, message.guild);
            if(!parsed) {
                parsed = await this.client.resolver.resolveUser(resolveable, false);
                if(!parsed) return null;
            }
        }
        return parsed;
    }

    async _displayRaw(message, permissions) {

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

        return await message.respond(message.format('C_PERMISSIONS_JSON'), { emoji: 'success', attachments: [ attachment ] })

    }

    _displayNames(permissions) {

        const modules = this.client.registry.components.filter(c=>c.type === 'module');
        let names = [];

        let temp = [];
        for(const module of modules.values()) {
            for(const component of module.components.filter(c=>c.type === 'command').values()) {
                if(permissions.includes(component.resolveable)) {
                    temp.push(component.resolveable);
                }
            }
            temp.length === module.components.filter(c=>c.type === 'command').size
                ? names.push(module.resolveable)
                : names = names.concat(temp);
            temp = [];
        }

        return names;

    }


}

module.exports = PermissionsCommand;