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'use strict'
function History (terminal, orca = terminal.room) {
this.index = 0
this.frames = []
this.record = function () {
if (this.index === this.frames.length) {
this.append()
} else {
this.fork()
}
this.index = this.frames.length
}
this.undo = function () {
if (terminal.room.id !== 'lobby') { console.warn('History', 'Outside Lobby'); return }
if (this.index === 0) { console.warn('History', 'Reached beginning'); return }
this.index = clamp(this.index - 1, 0, this.frames.lengt - 1)
this.apply(this.frames[this.index])
}
this.redo = function () {
if (terminal.room.id !== 'lobby') { console.warn('History', 'Outside Lobby'); return }
if (this.index > this.frames.length - 1) { console.warn('History', 'Reached end'); return }
this.index = clamp(this.index + 1, 0, this.frames.lengt - 1)
this.apply(this.frames[this.index])
}
this.apply = function (f) {
if (!f || f.length !== terminal.room.s.length) { return }
terminal.room.s = this.frames[this.index]
}
this.reset = function () {
this.index = 0
this.frames = []
}
this.append = function () {
this.frames.push(terminal.room.s)
}
this.fork = function () {
this.frames = this.frames.slice(0, this.index + 1)
this.frames.push(terminal.room.s)
}
function clamp (v, min, max) { return v < min ? min : v > max ? max : v }
}
module.exports = History
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