package expression;

import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.List;

/**
 * @author Doschennikov Nikita (me@fymio.us)
 */
public class Const extends AbstractExpression {

    private final int intValue;
    private final BigInteger biValue;
    private final BigDecimal bdValue;
    private final String repr;

    public Const(int value) {
        this.intValue = value;
        this.biValue = BigInteger.valueOf(value);
        this.bdValue = BigDecimal.valueOf(value);
        this.repr = Integer.toString(value);
    }

    public Const(BigInteger value) {
        this.intValue = value.intValueExact();
        this.biValue = value;
        this.bdValue = new BigDecimal(value);
        this.repr = value.toString();
    }

    public Const(BigDecimal value) {
        this.bdValue = value;
        this.biValue = value.toBigIntegerExact();
        this.intValue = biValue.intValueExact();
        this.repr = value.toPlainString();
    }

    @Override
    public int evaluate(int x) {
        return intValue;
    }

    @Override
    public int evaluate(int x, int y, int z) {
        return intValue;
    }

    @Override
    public int evaluate(List<Integer> vars) {
        return intValue;
    }

    @Override
    public BigInteger evaluateBi(List<BigInteger> vars) {
        return biValue;
    }

    @Override
    public BigDecimal evaluateBd(List<BigDecimal> vars) {
        return bdValue;
    }

    @Override
    public String toString() {
        return repr;
    }

    @Override
    public String toMiniString() {
        return repr;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) return true;
        if (!(obj instanceof Const)) return false;
        return repr.equals(((Const) obj).repr);
    }

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