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/**
 *  * The MIT License (MIT)
 * 
 * Copyright (c) 2014 Grzegorz Kochański
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 * 
 */
package org.itest.impl;

import java.io.ByteArrayOutputStream;
import java.io.PrintStream;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.itest.ITestConfig;
import org.itest.ITestConstants;
import org.itest.ITestContext;
import org.itest.definition.ITestDefinition;
import org.itest.exception.ITestException;
import org.itest.exception.ITestMethodExecutionException;
import org.itest.execution.ITestMethodExecutionResult;
import org.itest.execution.ITestMethodExecutor;
import org.itest.param.ITestParamState;
import org.itest.verify.ITestFieldVerificationResult;

public class ITestMethodExecutorImpl implements ITestMethodExecutor {
    private final ITestConfig iTestConfig;

    public ITestMethodExecutorImpl(ITestConfig iTestConfig) {
        this.iTestConfig = iTestConfig;
    }

    @Override
    public ITestMethodExecutionResult execute(ITestDefinition itestPathDefinition) throws InvocationTargetException {
        Class clazz = itestPathDefinition.getITestClass();
        Method method = itestPathDefinition.getITestMethod();
        ITestParamState initStateParam = itestPathDefinition.getInitParams().getElement(ITestConstants.THIS);
        if ( null == initStateParam ) {
            initStateParam = ITestRandomObjectGeneratorImpl.EMPTY_STATE;
        }
        Map itestGenericMap = itestPathDefinition.getITestGenericMap();
        Map, Map> staticAssignments = itestPathDefinition.getITestStaticAssignments();
        ITestContext iTestContext = new ITestContextImpl(itestPathDefinition.getITestStaticAssignments());
        ITestMethodExecutionResult itestData = new ITestMethodExecutionResult();
        iTestContext.enter(itestData, ITestConstants.THIS);
        Object itestObject = iTestConfig.getITestObjectGenerator().generate(clazz, initStateParam, itestGenericMap, iTestContext);
        iTestContext.leave();
        itestData.T = itestObject;

        Type parameterTypes[] = method.getGenericParameterTypes();
        Object parameters[] = new Object[parameterTypes.length];
        itestData.A = parameters;
        iTestContext.enter(itestData, ITestConstants.ARG);
        for (int i = 0; i < parameterTypes.length; i++) {
            ITestParamState argState = itestPathDefinition.getInitParams().getElement(ITestConstants.ARG);
            try {
                iTestContext.enter(parameters, String.valueOf(i));
                parameters[i] = iTestConfig.getITestObjectGenerator().generate(parameterTypes[i],
                        argState == null ? null : argState.getElement(String.valueOf(i)), itestGenericMap, iTestContext);
                iTestContext.leave();
            } catch (ITestException e) {
                e.addPrefix(method + " arg[" + i + "]: ");
                throw e;
            }
        }
        iTestContext.leave();
        // performAssignments(new ITestData(itestObject, parameters), iTestContext.getAssignments());

        try {
            method.setAccessible(true);
            Object res = method.invoke(itestObject, parameters);
            itestData.R = res;
            return itestData;
        } catch (InvocationTargetException e) {
            throw e;
        } catch (Exception e) {
            throw new ITestMethodExecutionException("Error invoking method:" + method, e);
        }
    }

    private void performAssignments(ITestMethodExecutionResult iTestData, Map, List> assignments) {
        Map, Collection>> dependencyMap = new HashMap, Collection>>();
        for (Map.Entry, List> entry : assignments.entrySet()) {
            Collection> col = dependencyMap.get(entry.getValue());
            if ( null == col ) {
                col = new ArrayList>();
                dependencyMap.put(entry.getValue(), col);
            }
            col.add(entry.getKey());
        }
        for (Map.Entry, Collection>> entry : dependencyMap.entrySet()) {
            System.out.println(entry.getKey() + " --- " + entry.getValue());
        }
    }

    private void performAssignment(ITestMethodExecutionResult iTestData, List target, List source, Map, List> assignments,
            Set> visited) {

        // TODO Auto-generated method stub

    }

    static class ITestInvocationTargetExecutionFailure implements ITestFieldVerificationResult {

        private final String message;

        private final InvocationTargetException exception;

        public ITestInvocationTargetExecutionFailure(String msg, InvocationTargetException e) {
            this.message = msg;
            this.exception = e;
        }

        @Override
        public boolean isSuccess() {
            return false;
        }

        @Override
        public String toString() {
            return "Failure " + message + ". Target Invocation exception:" + toString(exception.getTargetException());
        }

        private static String toString(Throwable exception) {
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            PrintStream ps = new PrintStream(baos);
            exception.printStackTrace(ps);
            return new String(baos.toByteArray());
        }
    }
}