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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;

public class NativeCallSite extends IdScriptableObject
{
    private static final String CALLSITE_TAG = "CallSite";

    private ScriptStackElement element;

    static void init(Scriptable scope, boolean sealed)
    {
        NativeCallSite cs = new NativeCallSite();
        cs.exportAsJSClass(MAX_PROTOTYPE_ID, scope, sealed);
    }

    static NativeCallSite make(Scriptable scope, Scriptable ctorObj)
    {
        NativeCallSite cs = new NativeCallSite();
        Scriptable proto = (Scriptable)(ctorObj.get("prototype", ctorObj));
        cs.setParentScope(scope);
        cs.setPrototype(proto);
        return cs;
    }

    private NativeCallSite()
    {
    }

    void setElement(ScriptStackElement elt)
    {
        this.element = elt;
    }

    @Override
    public String getClassName()
    {
        return "CallSite";
    }

    @Override
    protected void initPrototypeId(int id)
    {
        String s;
        int arity;
        switch (id) {
        case Id_constructor: arity = 0; s="constructor"; break;
        case Id_getThis: arity = 0; s="getThis"; break;
        case Id_getTypeName: arity = 0; s="getTypeName"; break;
        case Id_getFunction: arity = 0; s="getFunction"; break;
        case Id_getFunctionName: arity = 0; s="getFunctionName"; break;
        case Id_getMethodName: arity = 0; s="getMethodName"; break;
        case Id_getFileName: arity = 0; s="getFileName"; break;
        case Id_getLineNumber: arity = 0; s="getLineNumber"; break;
        case Id_getColumnNumber: arity = 0; s="getColumnNumber"; break;
        case Id_getEvalOrigin: arity = 0; s="getEvalOrigin"; break;
        case Id_isToplevel: arity = 0; s="isToplevel"; break;
        case Id_isEval: arity = 0; s="isEval"; break;
        case Id_isNative: arity = 0; s="isNative"; break;
        case Id_isConstructor: arity = 0; s="isConstructor"; break;
        case Id_toString: arity = 0; s="toString"; break;
        default: throw new IllegalArgumentException(String.valueOf(id));
        }
        initPrototypeMethod(CALLSITE_TAG, id, s, arity);
    }

    @Override
    protected int findPrototypeId(String s)
    {
        if ("constructor".equals(s)) {
            return Id_constructor;
        }
        if ("getThis".equals(s)) {
            return Id_getThis;
        }
        if ("getTypeName".equals(s)) {
            return Id_getTypeName;
        }
        if ("getFunction".equals(s)) {
            return Id_getFunction;
        }
        if ("getFunctionName".equals(s)) {
            return Id_getFunctionName;
        }
        if ("getMethodName".equals(s)) {
            return Id_getMethodName;
        }
        if ("getFileName".equals(s)) {
            return Id_getFileName;
        }
        if ("getLineNumber".equals(s)) {
            return Id_getLineNumber;
        }
        if ("getColumnNumber".equals(s)) {
            return Id_getColumnNumber;
        }
        if ("getEvalOrigin".equals(s)) {
            return Id_getEvalOrigin;
        }
        if ("isToplevel".equals(s)) {
            return Id_isToplevel;
        }
        if ("isEval".equals(s)) {
            return Id_isEval;
        }
        if ("isNative".equals(s)) {
            return Id_isNative;
        }
        if ("isConstructor".equals(s)) {
            return Id_isConstructor;
        }
        if ("toString".equals(s)) {
            return Id_toString;
        }
        return 0;
    }

    @Override
    public Object execIdCall(IdFunctionObject f, Context cx, Scriptable scope,
                             Scriptable thisObj, Object[] args)
    {
        if (!f.hasTag(CALLSITE_TAG)) {
            return super.execIdCall(f, cx, scope, thisObj, args);
        }
        int id = f.methodId();
        switch (id) {
        case Id_constructor:
            return make(scope, f);
        case Id_getThis:
            return getUndefined();
        case Id_getTypeName:
            return getUndefined();
        case Id_getFunction:
            return getUndefined();
        case Id_getFunctionName:
            return getFunctionName(thisObj);
        case Id_getMethodName:
            return getNull();
        case Id_getFileName:
            return getFileName(thisObj);
        case Id_getLineNumber:
            return getLineNumber(thisObj);
        case Id_getColumnNumber:
            return getColumnNumber(thisObj);
        case Id_getEvalOrigin:
            return getFalse();
        case Id_isToplevel:
            return getFalse();
        case Id_isEval:
            return getFalse();
        case Id_isNative:
            return getFalse();
        case Id_isConstructor:
            return getFalse();
        case Id_toString:
            return js_toString(thisObj);
        default:
            throw new IllegalArgumentException(String.valueOf(id));
        }
    }

    @Override
    public String toString()
    {
        if (element == null) {
            return "";
        }
        return element.toString();
    }

    private Object js_toString(Scriptable obj)
    {
        while(obj != null && !(obj instanceof NativeCallSite)) {
            obj = obj.getPrototype();
        }
        if (obj == null) {
            return NOT_FOUND;
        }
        NativeCallSite cs = (NativeCallSite)obj;
        StringBuilder sb = new StringBuilder();
        cs.element.renderLocation(sb);
        return sb.toString();
    }

    private Object getUndefined()
    {
        return Undefined.instance;
    }

    private Object getNull()
    {
        return null;
    }

    private Object getFalse()
    {
        return Boolean.FALSE;
    }

    private Object getFunctionName(Scriptable obj)
    {
        while(obj != null && !(obj instanceof NativeCallSite)) {
            obj = obj.getPrototype();
        }
        if (obj == null) {
            return NOT_FOUND;
        }
        NativeCallSite cs = (NativeCallSite)obj;
        return (cs.element == null ? null : cs.element.functionName);
    }

    private Object getFileName(Scriptable obj)
    {
        while(obj != null && !(obj instanceof NativeCallSite)) {
            obj = obj.getPrototype();
        }
        if (obj == null) {
            return NOT_FOUND;
        }
        NativeCallSite cs = (NativeCallSite)obj;
        return (cs.element == null ? null : cs.element.fileName);
    }

    private Object getLineNumber(Scriptable obj)
    {
        while(obj != null && !(obj instanceof NativeCallSite)) {
            obj = obj.getPrototype();
        }
        if (obj == null) {
            return NOT_FOUND;
        }
        NativeCallSite cs = (NativeCallSite)obj;
        if ((cs.element == null) || (cs.element.lineNumber < 0)) {
            return Undefined.instance;
        }
        return cs.element.lineNumber;
    }

    private Object getColumnNumber(Scriptable obj)
    {
        while(obj != null && !(obj instanceof NativeCallSite)) {
            obj = obj.getPrototype();
        }
        if (obj == null) {
            return NOT_FOUND;
        }
        NativeCallSite cs = (NativeCallSite)obj;
        if ((cs.element == null) || (cs.element.columnNumber < 0)) {
            return Undefined.instance;
        }
        return cs.element.columnNumber;
    }

    private static final int
      Id_constructor = 1,
      Id_getThis = 2,
      Id_getTypeName = 3,
      Id_getFunction = 4,
      Id_getFunctionName = 5,
      Id_getMethodName = 6,
      Id_getFileName = 7,
      Id_getLineNumber = 8,
      Id_getColumnNumber = 9,
      Id_getEvalOrigin = 10,
      Id_isToplevel = 11,
      Id_isEval = 12,
      Id_isNative = 13,
      Id_isConstructor = 14,
      Id_toString = 15,
      MAX_PROTOTYPE_ID = 15;
}