const {messageHelper} = require('messageHelper.js');
const {enums} = require('../enums.js');
const {Client, Message, Webhook, Channel} = require('@fluxerjs/core');

const name = 'PluralFlux Proxy Webhook';

const webhookHelper = {
    /**
     * Replaces a proxied message with a webhook using the member information.
     * @param {Client} client - The fluxer.js client.
     * @param {Message} message - The full message object.
     * @throws {Error} When the proxy message is not in a server.
     */
    async sendMessageAsMember(client, message) {
        const attachmentUrl = message.attachments.size > 0 ? message.attachments.first().url : null;
        const proxyMatch = await messageHelper.parseProxyTags(message.author.id, message.content, attachmentUrl).catch(e => {
            throw e
        });
        // If the message doesn't match a proxy, just return.
        if (!proxyMatch.member) {
            return;
        }
        // If the message does match a proxy but is not in a guild server (ex: in the Bot's DMs
        if (!message.guildId) {
            throw new Error(enums.err.NOT_IN_SERVER);
        }

        if (proxyMatch.message === enums.misc.ATTACHMENT_SENT_BY) {
            return await message.reply(`${enums.misc.ATTACHMENT_SENT_BY} ${proxyMatch.member.displayname}`)
        }
        await this.replaceMessage(client, message, proxyMatch.message, proxyMatch.member).catch(e => {
            throw e
        });
    },

    /**
     * Replaces a proxied message with a webhook using the member information.
     * @param {Client} client - The fluxer.js client.
     * @param {Message} message - The message to be deleted.
     * @param {string} text - The text to send via the webhook.
     * @param {model} member - A member object from the database.
     * @throws {Error} When there's no message to send.
     */
    async replaceMessage(client, message, text, member) {
        if (text.length > 0 || message.attachments.size > 0) {
            const channel = client.channels.get(message.channelId);
            const webhook = await this.getOrCreateWebhook(client, channel).catch((e) => {
                throw e
            });
            const username = member.displayname ?? member.name;
            await webhook.send({content: text, username: username, avatar_url: member.propic});
            await message.delete();
        } else {
            throw new Error(enums.err.NO_MESSAGE_SENT_WITH_PROXY);
        }
    },

    /**
     * Gets or creates a webhook.
     *
     * @param {Client} client - The fluxer.js client.
     * @param {Channel} channel - The channel the message was sent in.
     * @returns {Webhook} A webhook object.
     * @throws {Error} When no webhooks are allowed in the channel.
     */
    async getOrCreateWebhook(client, channel) {
        // If channel doesn't allow webhooks
        if (!channel?.createWebhook) throw new Error(enums.err.NO_WEBHOOKS_ALLOWED);
        let webhook = await this.getWebhook(client, channel).catch((e) => {
            throw e
        });
        if (!webhook) {
            webhook = await channel.createWebhook({name: name});
        }
        return webhook;
    },

    /**
     * Gets an existing webhook.
     *
     * @param {Client} client - The fluxer.js client.
     * @param {Channel} channel - The channel the message was sent in.
     * @returns {Webhook} A webhook object.
     */
    async getWebhook(client, channel) {
        const channelWebhooks = await channel?.fetchWebhooks() ?? [];
        if (channelWebhooks.length === 0) {
            return;
        }
        let pf_webhook;
        channelWebhooks.forEach((webhook) => {
            if (webhook.name === name) {
                pf_webhook = webhook;
            }
        })
        return pf_webhook;
    }
}


module.exports = webhookHelper;