class ApiClientUtil {

    constructor(client) {
        this.client = client;

        this.cache = {};

    }

    async handleMessage(shard, message) {

        const { type, id } = message;
        let response = null;
        try {
            switch (type) {
                case 'guild-live':
                    response = await this.getLiveGuild(message);
                    break;
                case 'settings-index':
                    response = await this.settingsIndex(message);
                    break;
                case 'user':
                    response = await this.user(message);
                    break;
                case 'settings':
                    response = await this.settings(message);
                    break;
                default:
                    return shard.send({ id, failure: true, error: '[IPC] No such type' });
            }
        } catch (error) {
            this.client.logger.error(`[CliUtil] ${error.stack || error}`);
            return shard.send({ id, failure: true, error });
        }

        this.client.logger.debug(`Result: ${JSON.stringify(response)}`);
        shard.send({ id, data: response, failure: !response });

    }

    async settings({ guildId }) {

        const evalFunc = async (client, { guildId }) => {
            const guild = client.guilds.resolve(guildId);
            if (!guild) return null;

            const wrapper = new client.wrapperClasses.GuildWrapper(client, guild);
            const settings = await wrapper.settings();
            return settings;
        };

        const results = await this.client.shardingManager.broadcastEval(evalFunc, { context: { guildId } });
        
        return results.find((result) => result !== null);

    }

    async user({ userid }) {
        
        const evalFunc = async (client, { user }) => {
            const _user = await client.users.fetch(user);
            return _user.toJSON();
        };
        const _shard = this.client.shardingManager.shards.random();
        const user = await _shard.eval(evalFunc, { user: userid });
        return user;
        
    }

    async settingsIndex() {

        if (this.cache['settings-index']?.last < Date.now() - 3600_000) return this.cache['settings-index'].value;
        const evalFunc = (client) => {
            const result = client.registry.settings.reduce((acc, setting) => {
                if (!acc[setting.module.name]) acc[setting.module.name] = [];
                acc[setting.module.name].push({ name: setting.name, ...setting.definitions });
                return acc;
            }, {});
            return result;
        };
        const _shard = this.client.shardingManager.shards.random();
        const index = await _shard.eval(evalFunc);
        this.cache['settings-index'] = { value: index, last: Date.now() };
        return index;

    }

    async getLiveGuild(message) { //eslint-disable-line no-unused-vars

        const { guildId } = message;
        const evalFunc = (client, { guildId }) => {
            const guild = client.guilds.cache.get(guildId);
            if (!guild) return null;
            const wrapper = new client.wrapperClasses.GuildWrapper(client, guild);
            return wrapper.toJSON();
        };

        this.client.logger.debug(`guild-live request - shard: ${message.shard}, message id ${message.id}`);
        const result = await this.client.shardingManager.broadcastEval(evalFunc, { context: { guildId } });
        const guild = result.find((elem) => elem !== undefined);
        return guild;

    }

}

module.exports = ApiClientUtil;