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 * The Universal Permissive License (UPL), Version 1.0
 *
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 * (a) the Software, and
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package com.oracle.js.parser.ir;

import java.util.ArrayList;
import java.util.List;

import com.oracle.js.parser.ir.visitor.NodeVisitor;
import com.oracle.js.parser.ir.visitor.TranslatorNodeVisitor;

/**
 * IR representation of a {@code try} statement.
 */
public final class TryNode extends Statement {
    /** Try statements. */
    private final Block body;

    /** List of catch clauses. */
    private final List catchBlocks;

    /** Finally clause. */
    private final Block finallyBody;

    /** Exception symbol. */
    private Symbol exception;

    /**
     * Constructor
     *
     * @param lineNumber lineNumber
     * @param token token
     * @param finish finish
     * @param body try node body
     * @param catchBlocks list of catch blocks in order
     * @param finallyBody body of finally block or null if none
     */
    public TryNode(final int lineNumber, final long token, final int finish, final Block body, final List catchBlocks, final Block finallyBody) {
        super(lineNumber, token, finish);
        this.body = body;
        this.catchBlocks = List.copyOf(catchBlocks);
        this.finallyBody = finallyBody;
    }

    private TryNode(final TryNode tryNode, final Block body, final List catchBlocks, final Block finallyBody) {
        super(tryNode);
        this.body = body;
        this.catchBlocks = List.copyOf(catchBlocks);
        this.finallyBody = finallyBody;
        this.exception = tryNode.exception;
    }

    @Override
    public boolean isTerminal() {
        if (body.isTerminal()) {
            for (final Block catchBlock : catchBlocks) {
                if (!catchBlock.isTerminal()) {
                    return false;
                }
            }
            return true;
        }
        return false;
    }

    /**
     * Assist in IR navigation.
     *
     * @param visitor IR navigating visitor.
     */
    @Override
    public Node accept(final NodeVisitor visitor) {
        if (visitor.enterTryNode(this)) {
            // Need to do finally body first for termination analysis. TODO still necessary?
            final Block newFinallyBody = finallyBody == null ? null : (Block) finallyBody.accept(visitor);
            final Block newBody = (Block) body.accept(visitor);
            //@formatter:off
            return visitor.leaveTryNode(
                setBody(newBody).
                setFinallyBody(newFinallyBody).
                setCatchBlocks(Node.accept(visitor, catchBlocks)));
            //@formatter:on
        }

        return this;
    }

    @Override
    public  R accept(TranslatorNodeVisitor visitor) {
        return visitor.enterTryNode(this);
    }

    @Override
    public void toString(final StringBuilder sb, final boolean printType) {
        sb.append("try ");
    }

    /**
     * Get the body for this try block
     *
     * @return body
     */
    public Block getBody() {
        return body;
    }

    /**
     * Reset the body of this try block
     *
     * @param body new body
     * @return new TryNode or same if unchanged
     */
    public TryNode setBody(final Block body) {
        if (this.body == body) {
            return this;
        }
        return new TryNode(this, body, catchBlocks, finallyBody);
    }

    /**
     * Get the catches for this try block
     *
     * @return a list of catch nodes
     */
    public List getCatches() {
        final List catches = new ArrayList<>(catchBlocks.size());
        for (final Block catchBlock : catchBlocks) {
            catches.add(getCatchNodeFromBlock(catchBlock));
        }
        return List.copyOf(catches);
    }

    private static CatchNode getCatchNodeFromBlock(final Block catchBlock) {
        return (CatchNode) catchBlock.getLastStatement();
    }

    /**
     * Get the catch blocks for this try block
     *
     * @return a list of blocks
     */
    public List getCatchBlocks() {
        return catchBlocks;
    }

    /**
     * Set the catch blocks of this try
     *
     * @param catchBlocks list of catch blocks
     * @return new TryNode or same if unchanged
     */
    public TryNode setCatchBlocks(final List catchBlocks) {
        if (this.catchBlocks == catchBlocks) {
            return this;
        }
        return new TryNode(this, body, catchBlocks, finallyBody);
    }

    /**
     * Get the exception symbol for this try block
     *
     * @return a symbol for the compiler to store the exception in
     */
    public Symbol getException() {
        return exception;
    }

    /**
     * Get the body of the finally clause for this try
     *
     * @return finally body, or null if no finally
     */
    public Block getFinallyBody() {
        return finallyBody;
    }

    /**
     * Set the finally body of this try
     *
     * @param finallyBody new finally body
     * @return new TryNode or same if unchanged
     */
    public TryNode setFinallyBody(final Block finallyBody) {
        if (this.finallyBody == finallyBody) {
            return this;
        }
        return new TryNode(this, body, catchBlocks, finallyBody);
    }

    @Override
    public boolean isCompletionValueNeverEmpty() {
        return true;
    }
}