const proggy = require('proggy')
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module.exports = cls => class Tracker extends cls {
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#progress = new Map()
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#createTracker (key, name) {
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const tracker = new proggy.Tracker(name ?? key)
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tracker.on('done', () => this.#progress.delete(key))
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this.#progress.set(key, tracker)
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}
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addTracker (section, subsection = null, key = null) {
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if (section === null || section === undefined) {
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this.#onError(`Tracker can't be null or undefined`)
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}
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if (key === null) {
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key = subsection
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}
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const hasTracker = this.#progress.has(section)
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const hasSubtracker = this.#progress.has(`${section}:${key}`)
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if (hasTracker && subsection === null) {
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// 0. existing tracker, no subsection
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this.#onError(`Tracker "${section}" already exists`)
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} else if (!hasTracker && subsection === null) {
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// 1. no existing tracker, no subsection
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// Create a new progress tracker
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this.#createTracker(section)
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} else if (!hasTracker && subsection !== null) {
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// 2. no parent tracker and subsection
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this.#onError(`Parent tracker "${section}" does not exist`)
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} else if (!hasTracker || !hasSubtracker) {
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// 3. existing parent tracker, no subsection tracker
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// Create a new subtracker and update parents
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const parentTracker = this.#progress.get(section)
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parentTracker.update(parentTracker.value, parentTracker.total + 1)
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this.#createTracker(`${section}:${key}`, `${section}:${subsection}`)
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}
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// 4. existing parent tracker, existing subsection tracker
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// skip it
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}
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finishTracker (section, subsection = null, key = null) {
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if (section === null || section === undefined) {
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this.#onError(`Tracker can't be null or undefined`)
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}
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if (key === null) {
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key = subsection
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}
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const hasTracker = this.#progress.has(section)
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const hasSubtracker = this.#progress.has(`${section}:${key}`)
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// 0. parent tracker exists, no subsection
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// Finish parent tracker and remove from this.#progress
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if (hasTracker && subsection === null) {
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// check if parent tracker does
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// not have any remaining children
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const keys = this.#progress.keys()
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for (const key of keys) {
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if (key.match(new RegExp(section + ':'))) {
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this.finishTracker(section, key)
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}
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}
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// remove parent tracker
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this.#progress.get(section).finish()
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} else if (!hasTracker && subsection === null) {
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// 1. no existing parent tracker, no subsection
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this.#onError(`Tracker "${section}" does not exist`)
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} else if (!hasTracker || hasSubtracker) {
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// 2. subtracker exists
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// Finish subtracker and remove from this.#progress
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const parentTracker = this.#progress.get(section)
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parentTracker.update(parentTracker.value + 1)
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this.#progress.get(`${section}:${key}`).finish()
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}
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// 3. existing parent tracker, no subsection
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}
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#onError (msg) {
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throw new Error(msg)
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}
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}
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