/*

 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

import java.io.*;

import java.lang.reflect.*;

/**

 * Test MethodParameter attributs by reflection API

 */

public class ReflectionVisitor extends Tester.Visitor {

    public ReflectionVisitor(Tester tester) {

        super(tester);

    }

    public void error(String msg) {

        super.error("reflection: " + msg);

    }

    public void warn(String msg) {

        super.warn("reflection: " + msg);

    }

    boolean isEnum;

    boolean isInterface;

    boolean isAnon;

    boolean isLocal;

    boolean isMember;

    boolean isStatic;

    boolean isPublic;

    Class clazz;

    StringBuilder sb;

    /**

     * Read class using {@code ClassFile}, and generate a list of methods

     * with parameter names as available in the MethodParameters attribute.

     */

    void visitClass(final String cl, final File cfile, final StringBuilder sb)

        throws Exception {

        this.sb = sb;

        clazz = Class.forName(cl);

        isEnum = clazz.isEnum();

        isInterface = clazz.isInterface();

        isAnon = clazz.isAnonymousClass();

        isLocal = clazz.isLocalClass();

        isMember = clazz.isMemberClass();

        isStatic = ((clazz.getModifiers() & Modifier.STATIC) != 0);

        isPublic = ((clazz.getModifiers() & Modifier.PUBLIC) != 0);

        sb.append(isStatic ? "static " : "")

            .append(isPublic ? "public " : "")

            .append(isEnum ? "enum " : isInterface ? "interface " : "class ")

            .append(cl).append(" -- ")

            .append(isMember? "member " : "" )

            .append(isLocal? "local " : "" )

            .append(isAnon ?  "anon" : "")

            .append("\n");

        for (Constructor c : clazz.getDeclaredConstructors()) {

            testConstructor(c);

        }

        for (Method m :clazz.getDeclaredMethods()) {

            testMethod(m);

        }

    }

    void testConstructor(Constructor c) {

        String prefix = clazz.getName() + "." + c.getName() + "() - ";

        // Parameters must match parameter types

        Parameter params[] = c.getParameters();

        int paramTypes =  c.getParameterTypes().length;

        if (paramTypes != params.length) {

            error(prefix + "number of parameter types (" + paramTypes

                  + ") != number of parameters (" + params.length + ")");

            return;

        }

        sb.append(clazz.getName()).append(".").append("<init>").append("(");

        String sep = "";

        // Some paramters are expected

        if (params.length < 2 && isEnum) {

            error(prefix + "enum constuctor, two arguments expected");

        } else if (params.length < 1 && (isAnon || isLocal ||

                                         (isMember && !isStatic ))) {

            error(prefix + "class constuctor,expected implicit argument");

        }

        int i = -1;

        String param = null;

        for (Parameter p : c.getParameters()) {

            i++;

            String pname = p.getName();

            sb.append(sep).append(pname);

            if (p.isImplicit()) sb.append("!");

            if (p.isSynthetic()) sb.append("!!");

            sep = ", ";

            // Set expectations

            String expect = null;

            boolean allowImplicit = false;

            boolean allowSynthetic = false;

            if (isEnum) {

                if (i == 0) {

                    expect = "\\$enum\\$name";

                    allowSynthetic = true;

                } else if(i == 1) {

                    expect = "\\$enum\\$ordinal";

                    allowSynthetic = true;

                }

            } else if (i == 0) {

                if (isAnon) {

                    allowImplicit = true;

                } else if (isLocal) {

                    allowImplicit = true;

                    expect = "this\\$[0-n]*";

                } else if ((isMember && !isStatic)) {

                    allowImplicit = true;

                    if (!isPublic) {

                        // some but not all non-public inner classes

                        // have synthetic argument. For now we give

                        // the test a bit of slack and allow either.

                        allowSynthetic = true;

                    }

                    expect = "this\\$[0-n]*";

                }

            }

            // Check expected flags

            if (p.isSynthetic() && p.isImplicit()) {

                error(prefix + "param[" + i + "]='" + pname +

                      "' both isImplicit() and isSynthetic()");

                break;

            }

            if (allowImplicit && allowSynthetic &&

                !(p.isSynthetic() || p.isImplicit())) {

                error(prefix + "param[" + i + "]='" + pname +

                      "' isImplicit() or isSynthetic() expected");

                break;

            }

            if (allowImplicit && !allowSynthetic && !p.isImplicit()) {

                error(prefix + "param[" + i + "]='" + pname +

                      "' isImplicit() expected");

                break;

            }

            if (!allowImplicit && allowSynthetic && !p.isSynthetic()) {

                error(prefix + "param[" + i + "]='" + pname +

                      "' isSynthetic() expected");

                break;

            }

            if (!allowImplicit && p.isImplicit()) {

                error(prefix + "param[" + i + "]='" + pname +

                      "' isImplicit() unexpected");

                break;

            }

            if (!allowSynthetic && p.isSynthetic()) {

                error(prefix + "param[" + i + "]='" + pname +

                      "' isSynthetic() unexpected");

                break;

            }

            // Check expected names

            if (expect != null) {

                if (pname.matches(expect))  continue;

                error(prefix + "param[" + i + "]='" + pname +

                      "' expected '" + expect + "'");

                break;

            }

            // Test naming convention for explicit parameters.

            boolean fidelity = !isAnon;

            if (param != null && fidelity) {

                char ch = param.charAt(0);

                expect =  (++ch) + param;

            }

            if (pname != null && fidelity) {

                param = pname;

            }

            if (expect != null && !expect.equals(pname)) {

                error(prefix + "param[" + i + "]='" + pname +

                      "' expected '" + expect + "'");

                break;

            }

        }

        if  (c.isSynthetic()) {

            sb.append(")!!\n");

        } else {

            sb.append(")\n");

        }

    }

    void testMethod(Method m) {

        String prefix = clazz.getName() + "." + m.getName() + "() - ";

        // Parameters must match parameter types

        int paramTypes =  m.getParameterTypes().length;

        int params = m.getParameters().length;

        if (paramTypes != params) {

            error(prefix + "number of parameter types (" + paramTypes

                  + ") != number of parameters (" + params + ")");

            return;

        }

        sb.append(clazz.getName()).append(".").append(m.getName()).append("(");

        String sep = "";

        String param = null;

        int i = -1;

        // For methods we expect all parameters to follow

        // the test-case design pattern, except synthetic methods.

        for (Parameter p : m.getParameters()) {

            i++;

            if (param == null) {

                param = p.getName();

                sb.append(sep).append(param);

            } else  {

                char c = param.charAt(0);

                String expect =  m.isSynthetic() ? ("arg" + i) : ((++c) + param);

                param = p.getName();

                sb.append(sep).append(param);

                    error(prefix + "param[" + i + "]='"

                          + param + "' expected '" + expect + "'");

                    break;

                }

            }

            sep = ", ";

        }

        if  (m.isSynthetic()) {

            sb.append(")!!\n");

        } else {

            sb.append(")\n");

        }

    }

}