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import Color from '../../utils/Color';
/**
* Sorting Algorithm BogoSort
*
* @author Bernhard Frick
* @param {number[]} elements
* @param {boolean} testing Set to true to test the algorithm
* @return {number[] || {do: {}[], undo: {}[]}[]}
*/
export default function BogoSort(elements, testing = false) {
const steps = [];
const randomElements = Array.from(elements);
let sorted = false;
while (!sorted) {
// this is BogoSort, you really thought we optimize and check first? :D
let m = randomElements.length;
let t;
let i;
// Fisher–Yates shuffle (in place):
// While there remain elements to shuffle...
while (m) {
// Pick a remaining element...
i = Math.floor(Math.random() * m);
m -= 1;
// And swap it with the current element
t = randomElements[m];
randomElements[m] = randomElements[i];
randomElements[i] = t;
steps.push({
do: [{
action: Action.EXCHANGE,
elements: [m, i],
text: `Exchange elements ${m} and ${i}.`,
}],
undo: [{
action: Action.EXCHANGE,
elements: [m, i],
text: `Exchange elements ${m} and ${i}.`,
}],
});
}
// check if elements are sorted
sorted = true;
for (i = 0; i < randomElements.length - 1; i += 1) {
if (randomElements[i] > randomElements[i + 1]) {
// not sorted, highlight red
steps.push({
do: [{
action: Action.SET_COLORS,
elements: [
{
index: i,
color: Color.BOGO_SORT_COMPARISON_WRONG,
},
{
index: i + 1,
color: Color.BOGO_SORT_COMPARISON_WRONG,
},
],
text: '',
}],
undo: [{
action: Action.SET_COLORS,
elements: [
{
index: i,
color: Color.BASE_COLOR_BAR_CHART,
},
{
index: i + 1,
color: Color.BASE_COLOR_BAR_CHART,
},
],
text: '',
}],
});
steps.push({
do: [{
action: Action.SET_COLORS,
elements: [
{
index: i,
color: Color.BASE_COLOR_BAR_CHART,
},
{
index: i + 1,
color: Color.BASE_COLOR_BAR_CHART,
},
],
text: '',
}],
undo: [{
action: Action.SET_COLORS,
elements: [
{
index: i,
color: Color.BOGO_SORT_COMPARISON_WRONG,
},
{
index: i + 1,
color: Color.BOGO_SORT_COMPARISON_WRONG,
},
],
text: '',
}],
});
sorted = false;
break;
}
// sorted, highlight green
steps.push({
do: [{
action: Action.SET_COLORS,
elements: [
{
index: i,
color: Color.BOGO_SORT_COMPARISON_TRUE,
},
{
index: i + 1,
color: Color.BOGO_SORT_COMPARISON_TRUE,
},
],
text: '',
}],
undo: [{
action: Action.SET_COLORS,
elements: [
{
index: i,
color: Color.BASE_COLOR_BAR_CHART,
},
{
index: i + 1,
color: Color.BASE_COLOR_BAR_CHART,
},
],
text: '',
}],
});
steps.push({
do: [{
action: Action.SET_COLORS,
elements: [
{
index: i,
color: Color.BASE_COLOR_BAR_CHART,
},
{
index: i + 1,
color: Color.BASE_COLOR_BAR_CHART,
},
],
text: '',
}],
undo: [{
action: Action.SET_COLORS,
elements: [
{
index: i,
color: Color.BOGO_SORT_COMPARISON_WRONG,
},
{
index: i + 1,
color: Color.BOGO_SORT_COMPARISON_WRONG,
},
],
text: '',
}],
});
}
}
// highlight all elements green
for (let i = 0; i < randomElements.length; i += 1) {
steps.push({
do: [{
action: Action.SET_COLORS,
elements: [
{
index: i,
color: Color.BOGO_SORT_ELEMENT_SORTED,
},
],
text: 'highlight green',
}],
undo: [{
action: Action.SET_COLORS,
elements: [
{
index: i,
color: Color.BASE_COLOR_BAR_CHART,
},
],
text: '',
}],
});
}
return testing ? randomElements : steps;
}
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