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/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

package org.mozilla.javascript.ast;

import org.mozilla.javascript.Token;

/**
 * If-else statement.  Node type is {@link Token#IF}.
 *
 * 
IfStatement :
 *       if ( Expression ) Statement else Statement
 *       if ( Expression ) Statement
 */
public class IfStatement extends AstNode {

    private AstNode condition;
    private AstNode thenPart;
    private int elsePosition = -1;
    private AstNode elsePart;
    private int lp = -1;
    private int rp = -1;

    {
        type = Token.IF;
    }

    public IfStatement() {
    }

    public IfStatement(int pos) {
        super(pos);
    }

    public IfStatement(int pos, int len) {
        super(pos, len);
    }

    /**
     * Returns if condition
     */
    public AstNode getCondition() {
        return condition;
    }

    /**
     * Sets if condition.
     * @throws IllegalArgumentException if {@code condition} is {@code null}.
     */
    public void setCondition(AstNode condition) {
        assertNotNull(condition);
        this.condition = condition;
        condition.setParent(this);
    }

    /**
     * Returns statement to execute if condition is true
     */
    public AstNode getThenPart() {
        return thenPart;
    }

    /**
     * Sets statement to execute if condition is true
     * @throws IllegalArgumentException if thenPart is {@code null}
     */
    public void setThenPart(AstNode thenPart) {
        assertNotNull(thenPart);
        this.thenPart = thenPart;
        thenPart.setParent(this);
    }

    /**
     * Returns statement to execute if condition is false
     */
    public AstNode getElsePart() {
        return elsePart;
    }

    /**
     * Sets statement to execute if condition is false
     * @param elsePart statement to execute if condition is false.
     * Can be {@code null}.
     */
    public void setElsePart(AstNode elsePart) {
        this.elsePart = elsePart;
        if (elsePart != null)
            elsePart.setParent(this);
    }

    /**
     * Returns position of "else" keyword, or -1
     */
    public int getElsePosition() {
        return elsePosition;
    }

    /**
     * Sets position of "else" keyword, -1 if not present
     */
    public void setElsePosition(int elsePosition) {
        this.elsePosition = elsePosition;
    }

    /**
     * Returns left paren offset
     */
    public int getLp() {
        return lp;
    }

    /**
     * Sets left paren offset
     */
    public void setLp(int lp) {
        this.lp = lp;
    }

    /**
     * Returns right paren position, -1 if missing
     */
    public int getRp() {
        return rp;
    }

    /**
     * Sets right paren position, -1 if missing
     */
    public void setRp(int rp) {
        this.rp = rp;
    }

    /**
     * Sets both paren positions
     */
    public void setParens(int lp, int rp) {
        this.lp = lp;
        this.rp = rp;
    }

    @Override
    public String toSource(int depth) {
        String pad = makeIndent(depth);
        StringBuilder sb = new StringBuilder(32);
        sb.append(pad);
        sb.append("if (");
        sb.append(condition.toSource(0));
        sb.append(") ");
        if (thenPart.getType() != Token.BLOCK) {
            sb.append("\n").append(makeIndent(depth + 1));
        }
        sb.append(thenPart.toSource(depth).trim());
        if (elsePart != null) {
            if (thenPart.getType() != Token.BLOCK) {
                sb.append("\n").append(pad).append("else ");
            } else {
                sb.append(" else ");
            }
            if (elsePart.getType() != Token.BLOCK
                    && elsePart.getType() != Token.IF) {
                sb.append("\n").append(makeIndent(depth + 1));
            }
            sb.append(elsePart.toSource(depth).trim());
        }
        sb.append("\n");
        return sb.toString();
    }

    /**
     * Visits this node, the condition, the then-part, and
     * if supplied, the else-part.
     */
    @Override
    public void visit(NodeVisitor v) {
        if (v.visit(this)) {
            condition.visit(v);
            thenPart.visit(v);
            if (elsePart != null) {
                elsePart.visit(v);
            }
        }
    }
}