83 lines
2.0 KiB
JavaScript
83 lines
2.0 KiB
JavaScript
/**
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* @typedef {object} PostLike
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* @property {string} id
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* @property {string} lexical
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* @property {string} html
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* @property {string} author_id
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* @property {string} title
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*/
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/**
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* @typedef {object} Revision
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* @property {string} post_id
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* @property {string} lexical
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* @property {number} created_at_ts
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* @property {string} author_id
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* @property {string} title
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*/
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class PostRevisions {
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/**
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* @param {object} deps
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* @param {object} deps.config
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* @param {number} deps.config.max_revisions
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*/
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constructor(deps) {
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this.config = deps.config;
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}
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/**
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* @param {PostLike} previous
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* @param {PostLike} current
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* @param {Revision[]} revisions
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* @returns {boolean}
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*/
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shouldGenerateRevision(previous, current, revisions) {
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if (!previous) {
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return false;
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}
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if (revisions.length === 0) {
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return true;
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}
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return previous.html !== current.html || previous.title !== current.title;
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}
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/**
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* @param {PostLike} previous
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* @param {PostLike} current
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* @param {Revision[]} revisions
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* @returns {Promise<Revision[]>}
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*/
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async getRevisions(previous, current, revisions) {
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if (!this.shouldGenerateRevision(previous, current, revisions)) {
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return revisions;
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}
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const currentRevision = this.convertPostLikeToRevision(current);
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if (revisions.length === 0) {
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return [
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currentRevision
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];
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}
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return [currentRevision, ...revisions].slice(0, this.config.max_revisions);
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}
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/**
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* @param {PostLike} input
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* @returns {Revision}
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*/
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convertPostLikeToRevision(input, offset = 0) {
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return {
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post_id: input.id,
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lexical: input.lexical,
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created_at_ts: Date.now() - offset,
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author_id: input.author_id,
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title: input.title
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};
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}
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}
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module.exports = PostRevisions;
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