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import * as Chord from 'chord'
// Model version: upgrade whenever the model is updated. Options are loaded
// only if versions match.
const version = '2'
export interface Model {
major: Chord.Chords
minor: Chord.Chords
seventh: Chord.Chords
minorSeventh: Chord.Chords
majorSeventh: Chord.Chords
bpm: number
beatsPerChord: number
}
let init: Model = {
major: new Set(Chord.plains),
minor: new Set(),
seventh: new Set(),
minorSeventh: new Set(),
majorSeventh: new Set(),
bpm: 90,
beatsPerChord: 4
}
export function load(): Model {
let storedVersion = localStorage['version']
if (storedVersion === undefined || storedVersion !== version) {
return init
} else {
let str = localStorage['options']
return str && fromString(str) || init
}
}
export function save(options: Model): void {
localStorage['version'] = version
localStorage['options'] = toString(options)
}
function toString(o: Model): string {
return JSON.stringify({
major: [...o.major],
minor: [...o.minor],
seventh: [...o.seventh],
minorSeventh: [...o.minorSeventh],
majorSeventh: [...o.majorSeventh],
bpm: o.bpm,
beatsPerChord: o.beatsPerChord
})
}
function fromString(str: string): Model | undefined {
const o = JSON.parse(str)
if (o === undefined) {
return undefined
} else {
return {
major: new Set(o.major),
minor: new Set(o.minor),
seventh: new Set(o.seventh),
minorSeventh: new Set(o.minorSeventh),
majorSeventh: new Set(o.majorSeventh),
bpm: o.bpm,
beatsPerChord: o.beatsPerChord
}
}
}
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