86 lines
2.0 KiB
JavaScript
86 lines
2.0 KiB
JavaScript
module.exports = {
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hasNext,
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getNextIndex,
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hasPrevious,
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getPreviousIndex,
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getCurrentLocalURL
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}
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const TorrentSummary = require('./torrent-summary')
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const TorrentPlayer = require('./torrent-player')
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const cache = {
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infoHash: null,
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previousIndex: null,
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currentIndex: null,
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nextIndex: null
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}
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function hasNext (state) {
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updateCache(state)
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return cache.nextIndex !== null
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}
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function getNextIndex (state) {
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updateCache(state)
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return cache.nextIndex
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}
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function hasPrevious (state) {
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updateCache(state)
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return cache.previousIndex !== null
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}
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function getPreviousIndex (state) {
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updateCache(state)
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return cache.previousIndex
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}
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function getCurrentLocalURL (state) {
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return state.server.localURL + '/' + state.playing.fileIndex
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}
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function updateCache (state) {
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const infoHash = state.playing.infoHash
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const fileIndex = state.playing.fileIndex
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if (infoHash === cache.infoHash) {
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switch (fileIndex) {
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case cache.currentIndex:
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return
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case cache.nextIndex:
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cache.previousIndex = cache.currentIndex
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cache.currentIndex = fileIndex
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cache.nextIndex = findNextIndex(state)
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return
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case cache.previousIndex:
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cache.previousIndex = findPreviousIndex(state)
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cache.nextIndex = cache.currentIndex
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cache.currentIndex = fileIndex
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return
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}
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} else {
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cache.infoHash = infoHash
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}
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cache.previousIndex = findPreviousIndex(state)
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cache.currentIndex = fileIndex
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cache.nextIndex = findNextIndex(state)
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}
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function findPreviousIndex (state) {
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const files = TorrentSummary.getByKey(state, state.playing.infoHash).files
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for (var i = state.playing.fileIndex - 1; i >= 0; i--) {
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if (TorrentPlayer.isPlayable(files[i])) return i
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}
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return null
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}
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function findNextIndex (state) {
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const files = TorrentSummary.getByKey(state, state.playing.infoHash).files
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for (var i = state.playing.fileIndex + 1; i < files.length; i++) {
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if (TorrentPlayer.isPlayable(files[i])) return i
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}
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return null
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}
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