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"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.SubarrayArbitrary = void 0;
const Arbitrary_1 = require("../../check/arbitrary/definition/Arbitrary");
const Value_1 = require("../../check/arbitrary/definition/Value");
const LazyIterableIterator_1 = require("../../stream/LazyIterableIterator");
const Stream_1 = require("../../stream/Stream");
const globals_1 = require("../../utils/globals");
const IsSubarrayOf_1 = require("./helpers/IsSubarrayOf");
const IntegerArbitrary_1 = require("./IntegerArbitrary");
const safeMathFloor = Math.floor;
const safeMathLog = Math.log;
const safeArrayIsArray = Array.isArray;
class SubarrayArbitrary extends Arbitrary_1.Arbitrary {
constructor(originalArray, isOrdered, minLength, maxLength) {
super();
this.originalArray = originalArray;
this.isOrdered = isOrdered;
this.minLength = minLength;
this.maxLength = maxLength;
if (minLength < 0 || minLength > originalArray.length)
throw new Error('fc.*{s|S}ubarrayOf expects the minimal length to be between 0 and the size of the original array');
if (maxLength < 0 || maxLength > originalArray.length)
throw new Error('fc.*{s|S}ubarrayOf expects the maximal length to be between 0 and the size of the original array');
if (minLength > maxLength)
throw new Error('fc.*{s|S}ubarrayOf expects the minimal length to be inferior or equal to the maximal length');
this.lengthArb = new IntegerArbitrary_1.IntegerArbitrary(minLength, maxLength);
this.biasedLengthArb =
minLength !== maxLength
? new IntegerArbitrary_1.IntegerArbitrary(minLength, minLength + safeMathFloor(safeMathLog(maxLength - minLength) / safeMathLog(2)))
: this.lengthArb;
}
generate(mrng, biasFactor) {
const lengthArb = biasFactor !== undefined && mrng.nextInt(1, biasFactor) === 1 ? this.biasedLengthArb : this.lengthArb;
const size = lengthArb.generate(mrng, undefined);
const sizeValue = size.value;
const remainingElements = (0, globals_1.safeMap)(this.originalArray, (_v, idx) => idx);
const ids = [];
for (let index = 0; index !== sizeValue; ++index) {
const selectedIdIndex = mrng.nextInt(0, remainingElements.length - 1);
(0, globals_1.safePush)(ids, remainingElements[selectedIdIndex]);
(0, globals_1.safeSplice)(remainingElements, selectedIdIndex, 1);
}
if (this.isOrdered) {
(0, globals_1.safeSort)(ids, (a, b) => a - b);
}
return new Value_1.Value((0, globals_1.safeMap)(ids, (i) => this.originalArray[i]), size.context);
}
canShrinkWithoutContext(value) {
if (!safeArrayIsArray(value)) {
return false;
}
if (!this.lengthArb.canShrinkWithoutContext(value.length)) {
return false;
}
return (0, IsSubarrayOf_1.isSubarrayOf)(this.originalArray, value);
}
shrink(value, context) {
if (value.length === 0) {
return Stream_1.Stream.nil();
}
return this.lengthArb
.shrink(value.length, context)
.map((newSize) => {
return new Value_1.Value((0, globals_1.safeSlice)(value, value.length - newSize.value), newSize.context);
})
.join(value.length > this.minLength
? (0, LazyIterableIterator_1.makeLazy)(() => this.shrink((0, globals_1.safeSlice)(value, 1), undefined)
.filter((newValue) => this.minLength <= newValue.value.length + 1)
.map((newValue) => new Value_1.Value([value[0], ...newValue.value], undefined)))
: Stream_1.Stream.nil());
}
}
exports.SubarrayArbitrary = SubarrayArbitrary;
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