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package com.nedap.archie.rules.evaluation.evaluators;

import com.nedap.archie.rules.BinaryOperator;
import com.nedap.archie.rules.OperatorKind;
import com.nedap.archie.rules.evaluation.Value;
import com.nedap.archie.rules.evaluation.ValueList;

import java.util.List;

/**
 * Created by pieter.bos on 07/02/2017.
 */
public class BinaryBooleanOperandEvaluator {

    BinaryOperatorEvaluator mainEvaluator;

    public BinaryBooleanOperandEvaluator(BinaryOperatorEvaluator mainEvaluator) {
        this.mainEvaluator = mainEvaluator;
    }

    protected Value evaluateMultipleValuesBooleanRelOp(BinaryOperator statement, ValueList leftValues, ValueList rightValues) {

        for(Value leftValue:leftValues.getValues()) {
            for (Value rightValue:rightValues.getValues()) {
                Value evaluatedRelOp = evaluateBooleanRelOp(statement, leftValue.getValue(), rightValue.getValue(), mainEvaluator.getPaths(leftValue, rightValue));
                if (((Boolean) evaluatedRelOp.getValue()).booleanValue()) {
                    return evaluatedRelOp;
                }
            }
        }
        return new Value<>(false, mainEvaluator.getAllPaths(leftValues, rightValues));
    }


    private Value evaluateBooleanRelOp(BinaryOperator statement, Object leftValue, Object rightValue, List paths) {
        if(leftValue == null || rightValue == null) {
            return new Value<>(mainEvaluator.evaluateNullRelOp(statement.getOperator(), leftValue, rightValue), paths);
        }
        else if(leftValue instanceof Boolean && rightValue instanceof Boolean) {
            return new Value<>(evaluateBooleanRelOp(statement.getOperator(),
                    (boolean) leftValue,
                    (boolean) rightValue
            ), paths);
        } else {
            throw new IllegalStateException("operand types not both Boolean: " + leftValue.getClass().getSimpleName() + " and " + rightValue.getClass().getSimpleName());
        }
    }

    private Boolean evaluateBooleanRelOp(OperatorKind operator, boolean leftValue, boolean rightValue) {
        switch(operator) {
            case eq:
                return leftValue == rightValue;
            case ne:
                return leftValue != rightValue;
            default:
                throw new IllegalArgumentException("Not a boolean operator with boolean operands: " + operator);
        }
    }
}