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package com.oracle.js.parser.ir;

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

/**
 * IR representation of a catch clause.
 */
public final class CatchNode extends Statement {
    /** Exception identifier. */
    private final IdentNode exception;

    /** Exception destructuring pattern. */
    private final Expression pattern;

    /** Exception condition. */
    private final Expression exceptionCondition;

    /** Catch body. */
    private final Block body;

    private final boolean isSyntheticRethrow;

    /**
     * Constructors
     *
     * @param lineNumber lineNumber
     * @param token token
     * @param finish finish
     * @param exception variable name of exception
     * @param pattern catch parameter destructuring assignment
     * @param exceptionCondition exception condition
     * @param body catch body
     * @param isSyntheticRethrow true if this node is a synthetically generated rethrow node.
     */
    public CatchNode(final int lineNumber, final long token, final int finish, final IdentNode exception,
                    final Expression pattern, final Expression exceptionCondition, final Block body, final boolean isSyntheticRethrow) {
        super(lineNumber, token, finish);
        this.exception = exception == null ? null : exception.setIsInitializedHere();
        this.pattern = pattern;
        this.exceptionCondition = exceptionCondition;
        this.body = body;
        this.isSyntheticRethrow = isSyntheticRethrow;
    }

    private CatchNode(final CatchNode catchNode, final IdentNode exception, final Expression pattern,
                    final Expression exceptionCondition, final Block body, final boolean isSyntheticRethrow) {
        super(catchNode);
        this.exception = exception;
        this.pattern = pattern;
        this.exceptionCondition = exceptionCondition;
        this.body = body;
        this.isSyntheticRethrow = isSyntheticRethrow;
    }

    /**
     * Assist in IR navigation.
     *
     * @param visitor IR navigating visitor.
     */
    @Override
    public Node accept(final NodeVisitor visitor) {
        if (visitor.enterCatchNode(this)) {
            //@formatter:off
            return visitor.leaveCatchNode(
                setException(exception == null ? null : (IdentNode) exception.accept(visitor)).
                setDestructuringPattern(pattern == null ? null : (Expression) pattern.accept(visitor)).
                setExceptionCondition(exceptionCondition == null ? null : (Expression) exceptionCondition.accept(visitor)).
                setBody((Block) body.accept(visitor)));
            //@formatter:on
        }

        return this;
    }

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

    @Override
    public boolean isTerminal() {
        return body.isTerminal();
    }

    @Override
    public void toString(final StringBuilder sb, final boolean printTypes) {
        sb.append(" catch (");

        if (pattern != null) {
            pattern.toString(sb, printTypes);
        } else {
            exception.toString(sb, printTypes);
        }

        if (exceptionCondition != null) {
            sb.append(" if ");
            exceptionCondition.toString(sb, printTypes);
        }
        sb.append(')');
    }

    /**
     * Get the identifier representing the exception thrown
     *
     * @return the exception identifier
     */
    public Expression getException() {
        return exception;
    }

    /**
     * Get the exception condition for this catch block
     *
     * @return the exception condition
     */
    public Expression getExceptionCondition() {
        return exceptionCondition;
    }

    /**
     * Reset the exception condition for this catch block
     *
     * @param exceptionCondition the new exception condition
     * @return new or same CatchNode
     */
    public CatchNode setExceptionCondition(final Expression exceptionCondition) {
        if (this.exceptionCondition == exceptionCondition) {
            return this;
        }
        return new CatchNode(this, exception, pattern, exceptionCondition, body, isSyntheticRethrow);
    }

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

    /**
     * Resets the exception of a catch block
     *
     * @param exception new exception
     * @return new catch node if changed, same otherwise
     */
    public CatchNode setException(final IdentNode exception) {
        if (this.exception == exception) {
            return this;
        }
        return new CatchNode(this, exception, pattern, exceptionCondition, body, isSyntheticRethrow);
    }

    /**
     * Get the exception destructuring pattern for this catch block
     *
     * @return the destructuring pattern
     */
    public Expression getDestructuringPattern() {
        return pattern;
    }

    /**
     * Resets the exception destructuring pattern of a catch block
     *
     * @param pattern new pattern
     * @return new catch node if changed, same otherwise
     */
    public CatchNode setDestructuringPattern(final Expression pattern) {
        if (this.pattern == pattern) {
            return this;
        }
        return new CatchNode(this, exception, pattern, exceptionCondition, body, isSyntheticRethrow);
    }

    private CatchNode setBody(final Block body) {
        if (this.body == body) {
            return this;
        }
        return new CatchNode(this, exception, pattern, exceptionCondition, body, isSyntheticRethrow);
    }

    /**
     * Is this catch block a non-JavaScript constructor, for example created as part of the rethrow
     * mechanism of a finally block in Lower? Then we just pass the exception on and need not unwrap
     * whatever is in the ECMAException object catch symbol
     *
     * @return true if a finally synthetic rethrow
     */
    public boolean isSyntheticRethrow() {
        return isSyntheticRethrow;
    }
}