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package net.jqwik.engine.properties.arbitraries;

import java.math.*;
import java.util.*;
import java.util.function.*;

import net.jqwik.api.*;
import net.jqwik.api.arbitraries.*;

public class DefaultIntegerArbitrary extends TypedCloneable implements IntegerArbitrary {

	private static final int DEFAULT_MIN = Integer.MIN_VALUE;
	private static final int DEFAULT_MAX = Integer.MAX_VALUE;

	private IntegralGeneratingArbitrary generatingArbitrary;

	public DefaultIntegerArbitrary() {
		this.generatingArbitrary = new IntegralGeneratingArbitrary(BigInteger.valueOf(DEFAULT_MIN), BigInteger.valueOf(DEFAULT_MAX));
	}

	@Override
	public RandomGenerator generator(int genSize) {
		return generatingArbitrary.generator(genSize).map(BigInteger::intValueExact);
	}

	@Override
	public Optional> exhaustive(long maxNumberOfSamples) {
		return generatingArbitrary.exhaustive(maxNumberOfSamples).map(generator -> generator.map(BigInteger::intValueExact));
	}

	@Override
	public EdgeCases edgeCases(int maxEdgeCases) {
		return EdgeCasesSupport.map(generatingArbitrary.edgeCases(maxEdgeCases), BigInteger::intValueExact);
	}

	@Override
	public Arbitrary edgeCases(Consumer> configurator) {
		Consumer> integralConfigurator = new MappedEdgeCasesConsumer<>(
				configurator,
				BigInteger::intValueExact,
				(Function) BigInteger::valueOf
		);
		DefaultIntegerArbitrary clone = typedClone();
		clone.generatingArbitrary = (IntegralGeneratingArbitrary) generatingArbitrary.edgeCases(integralConfigurator);
		return clone;
	}

	@Override
	public IntegerArbitrary withDistribution(final RandomDistribution distribution) {
		DefaultIntegerArbitrary clone = typedClone();
		clone.generatingArbitrary.distribution = distribution;
		return clone;
	}

	@Override
	public IntegerArbitrary greaterOrEqual(int min) {
		DefaultIntegerArbitrary clone = typedClone();
		clone.generatingArbitrary.min = BigInteger.valueOf(min);
		return clone;
	}

	@Override
	public IntegerArbitrary lessOrEqual(int max) {
		DefaultIntegerArbitrary clone = typedClone();
		clone.generatingArbitrary.max = BigInteger.valueOf(max);
		return clone;
	}

	@Override
	public IntegerArbitrary shrinkTowards(int target) {
		DefaultIntegerArbitrary clone = typedClone();
		clone.generatingArbitrary.shrinkingTarget = BigInteger.valueOf(target);
		return clone;
	}

	@Override
	public boolean equals(Object o) {
		if (this == o) return true;
		if (o == null || getClass() != o.getClass()) return false;

		DefaultIntegerArbitrary that = (DefaultIntegerArbitrary) o;
		return generatingArbitrary.equals(that.generatingArbitrary);
	}

	@Override
	public int hashCode() {
		return generatingArbitrary.hashCode();
	}
}