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/*
 * Copyright 2008 ThoughtWorks, Inc.
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 */
package com.thoughtworks.selenium.condition;

import java.lang.reflect.Method;
import java.lang.reflect.InvocationTargetException;

/**
 * Simple predicate class, which also knows how to wait for the condition to be true.
 * Used by Selenium tests.
 * 
 * 
Conditions have two basic properties:
 * 

 * 

 * a message (purely used for displaying purposes)
 * 
an implementation of
 * {@link #isTrue(com.google.testing.selenium.condition.ConditionRunner.Context)}
 * 
 */
public abstract class Condition {

    private final String message;

    public abstract boolean isTrue(ConditionRunner.Context runner);

    /**
     * Creates an instance of Condition with is canonical name as message
     */
    public Condition() {
        this.message = getClass().getCanonicalName();
    }

    /**
     * Creates an instance of Condition with the given {@code message} and
     * {@code args}, which are in the {@link String#format(String, Object...)}
     * modeal.
     */
    public Condition(String message, Object[] args) {
        if (null == message) {
            throw new NullPointerException("Condition names must not be null");
        }
        // this.message = String.format(message, args);
        this.message = simulateStringDotFormatMethod(message, args);
    }

    private String simulateStringDotFormatMethod(String message, Object[] args) {
        int vers = Integer.parseInt(System.getProperty("java.class.version").substring(0, 2));
        if (vers >= 49) {
            try {
                Method format = String.class.getMethod("format", new Class[]{String.class, Object[].class});
                return (String) format.invoke(null, new Object[]{message, args});
            } catch (NoSuchMethodException e) {
            } catch (IllegalAccessException e) {
            } catch (InvocationTargetException e) {
                Throwable throwable = e.getCause();
                if (throwable instanceof RuntimeException) {
                    throw (RuntimeException) throwable;
                }
            }
            throw new RuntimeException("String.format(..) can't be that hard to call");
        } else {
            String msg = "";
            msg = message;
            for (int i = 0; i < args.length; i++) {
                msg = msg + " " + args[i];
            }
            return msg;

        }

    }

    // drop these for var-args in another year.
    public Condition(String message) {
        this(message, new Object[0]);
    }

    public Condition(String message, Object arg) {
        this(message, new Object[]{arg});
    }

    public Condition(String message, Object arg0, Object arg1) {
        this(message, new Object[]{arg0, arg1});
    }

    public Condition(String message, Object arg0, Object arg1, Object arg2) {
        this(message, new Object[]{arg0, arg1, arg2});
    }

    public Condition(String message, Object arg0, Object arg1, Object arg2, Object arg3) {
        this(message, new Object[]{arg0, arg1, arg2, arg3});
    }

    public Condition(String message, Object arg0, Object arg1, Object arg2, Object arg3, Object arg4) {
        this(message, new Object[]{arg0, arg1, arg2, arg3, arg4});
    }

    public String getMessage() {
        return toString();
    }

    public String toString() {
        return "Condition \"" + this.message + "\"";
    }
}