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package com.oracle.js.parser.ir;

import java.util.Collections;
import java.util.List;

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

/**
 * IR representation for a function call.
 */
public final class CallNode extends OptionalExpression {

    /** Function identifier or function body. */
    private final Expression function;

    /** Call arguments. */
    private final List args;

    /** Is this a "new" operation */
    private static final int IS_NEW = 1 << 0;

    /** Can this be an eval? */
    private static final int IS_EVAL = 1 << 1;

    /** Is this an ImportCall? */
    private static final int IS_IMPORT = 1 << 2;

    /** Does this look like an apply call? */
    private static final int IS_APPLY_ARGUMENTS = 1 << 3;

    /** Is this an optional call ({@code a?.()}). */
    private static final int IS_OPTIONAL = 1 << 4;

    /** Is this call part of an optional chain. */
    private static final int IS_OPTIONAL_CHAIN = 1 << 5;

    private final int flags;

    private final int lineNumber;

    public static Expression forNew(int lineNumber, long token, int start, int finish, Expression function, List args) {
        return new CallNode(lineNumber, token, start, finish, function, args, IS_NEW);
    }

    public static Expression forCall(int lineNumber, long token, int start, int finish, Expression function, List args) {
        return forCall(lineNumber, token, start, finish, function, args, false, false, false, false);
    }

    public static Expression forCall(int lineNumber, long token, int start, int finish, Expression function, List args,
                    boolean optional, boolean optionalChain) {
        return forCall(lineNumber, token, start, finish, function, args, optional, optionalChain, false, false);
    }

    public static Expression forCall(int lineNumber, long token, int start, int finish, Expression function, List args,
                    boolean optional, boolean optionalChain, boolean isEval, boolean isApplyArguments) {
        return new CallNode(lineNumber, token, start, finish, setIsFunction(function), args,
                        (optional ? IS_OPTIONAL : 0) | (optionalChain ? IS_OPTIONAL_CHAIN : 0) | (isEval ? IS_EVAL : 0) | (isApplyArguments ? IS_APPLY_ARGUMENTS : 0));
    }

    public static Expression forImport(int lineNumber, long token, int start, int finish, IdentNode importIdent, List args) {
        return new CallNode(lineNumber, token, start, finish, importIdent, args, IS_IMPORT);
    }

    private CallNode(int lineNumber, long token, int start, int finish, Expression function, List args, int flags) {
        super(token, start, finish);

        this.function = function;
        this.args = args;
        this.flags = flags;
        this.lineNumber = lineNumber;
    }

    private CallNode(final CallNode callNode, final Expression function, final List args, final int flags) {
        super(callNode);
        this.lineNumber = callNode.lineNumber;
        this.function = function;
        this.args = args;
        this.flags = flags;
    }

    private static Expression setIsFunction(final Expression function) {
        return function instanceof BaseNode ? ((BaseNode) function).setIsFunction() : function;
    }

    /**
     * Returns the line number.
     *
     * @return the line number.
     */
    public int getLineNumber() {
        return lineNumber;
    }

    /**
     * Assist in IR navigation.
     *
     * @param visitor IR navigating visitor.
     *
     * @return node or replacement
     */
    @Override
    public Node accept(final NodeVisitor visitor) {
        if (visitor.enterCallNode(this)) {
            return visitor.leaveCallNode(setFunction((Expression) function.accept(visitor)).setArgs(Node.accept(visitor, args)));
        }

        return this;
    }

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

    @Override
    public void toString(final StringBuilder sb, final boolean printType) {
        final StringBuilder fsb = new StringBuilder();
        function.toString(fsb, printType);
        sb.append(fsb);

        if (isOptional()) {
            sb.append('?').append('.');
        }

        sb.append('(');

        boolean first = true;

        for (final Node arg : args) {
            if (!first) {
                sb.append(", ");
            } else {
                first = false;
            }

            arg.toString(sb, printType);
        }

        sb.append(')');
    }

    /**
     * Get the arguments for the call
     *
     * @return a list of arguments
     */
    public List getArgs() {
        return Collections.unmodifiableList(args);
    }

    /**
     * Reset the arguments for the call
     *
     * @param args new arguments list
     * @return new callnode, or same if unchanged
     */
    public CallNode setArgs(final List args) {
        if (this.args == args) {
            return this;
        }
        return new CallNode(this, function, args, flags);
    }

    /**
     * Check if this call is a call to {@code eval}
     *
     * @return true if this is a call to {@code eval}
     */
    public boolean isEval() {
        return (flags & IS_EVAL) != 0;
    }

    /**
     * Return the function expression that this call invokes
     *
     * @return the function
     */
    public Expression getFunction() {
        return function;
    }

    /**
     * Reset the function expression that this call invokes
     *
     * @param function the function
     * @return same node or new one on state change
     */
    public CallNode setFunction(final Expression function) {
        if (this.function == function) {
            return this;
        }
        return new CallNode(this, function, args, flags);
    }

    /**
     * Check if this call is a new operation
     *
     * @return true if this a new operation
     */
    public boolean isNew() {
        return (flags & IS_NEW) != 0;
    }

    /**
     * Check if this call is a dynamic import call.
     */
    public boolean isImport() {
        return (flags & IS_IMPORT) != 0;
    }

    /**
     * Check if this call is an apply call.
     */
    public boolean isApplyArguments() {
        return (flags & IS_APPLY_ARGUMENTS) != 0;
    }

    @Override
    public boolean isOptional() {
        return (flags & IS_OPTIONAL) != 0;
    }

    @Override
    public boolean isOptionalChain() {
        return (flags & IS_OPTIONAL_CHAIN) != 0;
    }
}