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package cdc.applic.expressions.ast;

import java.io.PrintStream;
import java.util.Arrays;
import java.util.List;

import cdc.applic.expressions.Formatting;
import cdc.util.debug.Printables;
import cdc.util.lang.Checks;

/**
 * Base class of n-ary nodes.
 *
 * @author Damien Carbonne
 */
public abstract class AbstractNaryNode extends AbstractOperatorNode {
    protected static final String NODES = "nodes";
    private final Node[] children;
    private int hash = 0;

    protected AbstractNaryNode(Node... children) {
        Checks.isNotNull(children, "children");
        if (children.length < 1) {
            throw new IllegalArgumentException("No enough children");
        }
        this.children = children.clone();
    }

    protected AbstractNaryNode(List children) {
        this(children.toArray(new Node[children.size()]));
    }

    @Override
    public final int getChildrenCount() {
        return children.length;
    }

    @Override
    public final Node getChildAt(int index) {
        if (index >= 0 && index < children.length) {
            return children[index];
        } else {
            throw new IllegalArgumentException("Invalid index (" + index + ")");
        }
    }

    public final Node[] getChildren() {
        return children;
    }

    public final List getChildrenAsList() {
        return Arrays.asList(children);
    }

    /**
     * Creates an NaryNode with same kind as this node, from an array of nodes.
     *
     * @param children The children nodes.
     * @return An instance of this class combining {@code nodes}.
     * @throws IllegalArgumentException When {@code children} is {@code null} or empty.
     */
    public abstract AbstractNaryNode create(Node... children);

    /**
     * Creates an NaryNode with same kind as this node, from an list of nodes.
     *
     * @param children The children nodes.
     * @return An instance of this class combining {@code nodes}.
     * @throws IllegalArgumentException When {@code children} is {@code null} or empty.
     */
    public abstract AbstractNaryNode create(List children);

    @Override
    public final int getHeight() {
        int max = 0;
        for (int index = 0; index < children.length; index++) {
            max = Math.max(max, children[index].getHeight());
        }
        return 1 + max;
    }

    @Override
    public final void print(PrintStream out,
                            int level) {
        Printables.indent(out, level);
        out.println(getKind());
        for (final Node child : getChildren()) {
            child.print(out, level + 1);
        }
    }

    @Override
    public final void buildInfix(Formatting formatting,
                                 StringBuilder builder) {
        boolean first = true;
        boolean previousChildParen = false;
        for (final Node child : getChildren()) {
            final boolean childParen = needParentheses(child);
            if (first) {
                first = false;
            } else {
                getKerning().addSpace(builder, formatting, previousChildParen);
                getKerning().addSymbol(builder, formatting);
                getKerning().addSpace(builder, formatting, childParen);
            }
            NodeKerning.addOpenParenthese(builder, childParen);
            child.buildInfix(formatting, builder);
            NodeKerning.addCloseParenthese(builder, childParen);
            previousChildParen = childParen;
        }
    }

    @Override
    public  R accept(Visitor visitor) {
        return visitor.visitNary(this);
    }

    @Override
    public final boolean equals(Object object) {
        if (this == object) {
            return true;
        }
        if (object == null || !getClass().equals(object.getClass())) {
            return false;
        }
        final AbstractNaryNode other = (AbstractNaryNode) object;
        return Arrays.equals(children, other.children);
    }

    @Override
    public final int hashCode() {
        if (hash == 0) {
            hash = Arrays.hashCode(children);
        }
        return hash;
    }

    @Override
    public String toString() {
        final StringBuilder builder = new StringBuilder();
        builder.append(getKind());
        builder.append("(");
        for (int index = 0; index < children.length; index++) {
            if (index != 0) {
                builder.append(",");
            }
            builder.append(children[index]);
        }
        builder.append(")");

        return builder.toString();
    }
}