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/**
 * The MIT License (MIT)
 *
 * Copyright (c) 2011-2016 Incapture Technologies LLC
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package reflex.node;

import java.util.Map;

import reflex.IReflexHandler;
import reflex.ReflexException;
import reflex.Scope;
import reflex.debug.IReflexDebugger;
import reflex.value.ReflexValue;

public class RemoveNode extends BaseNode {

    private String varName;
    private ReflexNode keyExpression;

    public RemoveNode(int lineNumber, IReflexHandler handler, Scope s, String identifier, ReflexNode keyExpression) {
        super(lineNumber, handler, s);
        this.varName = identifier;
        this.keyExpression = keyExpression;
    }

    @Override
    public ReflexValue evaluate(IReflexDebugger debugger, Scope scope) {

        debugger.stepStart(this, scope);
        ReflexValue valToModify = scope.resolve(varName);
        if (valToModify == null) {
            throw new ReflexException(lineNumber, "No such variable " + varName);
        }
        if (!valToModify.isMap()) {
            throw new ReflexException(lineNumber, varName + " is not a map");
        }
        // Expression should resolve to a key that we should remove. We only remove top level ones at present
        Map v = valToModify.asMap();
        ReflexValue keyVal = keyExpression.evaluate(debugger, scope);
        String keyName = keyVal.asString();
        if (v.containsKey(keyName)) {
            v.remove(keyName);
            valToModify = new ReflexValue(v);
            scope.assign(varName, valToModify);
        }
        debugger.stepEnd(this, valToModify, scope);
        return valToModify;
    }

    @Override
    public String toString() {
        return String.format("remove(%s,%s)", varName, keyExpression);
    }
}