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//Own

#include "states.h"

#include "graphicsscene.h"

#include "boat.h"

#include "submarine.h"

#include "torpedo.h"

#include "animationmanager.h"

#include "progressitem.h"

#include "textinformationitem.h"

//Qt

#include <QtGui/QMessageBox>

#include <QtGui/QGraphicsView>

#include <QtCore/QStateMachine>

#include <QtGui/QKeyEventTransition>

#include <QtCore/QFinalState>

PlayState::PlayState(GraphicsScene *scene, QState *parent)

    : QState(parent),

    scene(scene),

    machine(0),

    currentLevel(0),

    score(0)

{

}

PlayState::~PlayState()

{

    delete machine;

}

void PlayState::onEntry(QEvent *)

{

    //We are now playing?

    if (machine) {

        machine->stop();

        //we hide the information

        scene->textInformationItem->hide();

        scene->clearScene();

        currentLevel = 0;

        score = 0;

        delete machine;

    }

    machine = new QStateMachine;

    //This state is when player is playing

    LevelState *levelState = new LevelState(scene, this, machine);

    //This state is when the player is actually playing but the game is not paused

    QState *playingState = new QState(levelState);

    levelState->setInitialState(playingState);

    //This state is when the game is paused

    PauseState *pauseState = new PauseState(scene, levelState);

    //We have one view, it receive the key press event

    QKeyEventTransition *pressPplay = new QKeyEventTransition(scene->views().at(0), QEvent::KeyPress, Qt::Key_P);

    pressPplay->setTargetState(pauseState);

    QKeyEventTransition *pressPpause = new QKeyEventTransition(scene->views().at(0), QEvent::KeyPress, Qt::Key_P);

    pressPpause->setTargetState(playingState);

    //Pause "P" is triggered, the player pause the game

    playingState->addTransition(pressPplay);

    //To get back playing when the game has been paused

    pauseState->addTransition(pressPpause);

    //This state is when player have lost

    LostState *lostState = new LostState(scene, this, machine);

    //This state is when player have won

    WinState *winState = new WinState(scene, this, machine);

    //The boat has been destroyed then the game is finished

    levelState->addTransition(scene->boat, SIGNAL(boatExecutionFinished()),lostState);

    //This transition check if we won or not

    WinTransition *winTransition = new WinTransition(scene, this, winState);

    //The boat has been destroyed then the game is finished

    levelState->addTransition(winTransition);

    //This state is an animation when the score changed

    UpdateScoreState *scoreState = new UpdateScoreState(this, levelState);

    //This transition update the score when a submarine die

    UpdateScoreTransition *scoreTransition = new UpdateScoreTransition(scene, this, levelState);

    scoreTransition->setTargetState(scoreState);

    //The boat has been destroyed then the game is finished

    playingState->addTransition(scoreTransition);

    //We go back to play state

    scoreState->addTransition(playingState);

    //We start playing!!!

    machine->setInitialState(levelState);

    //Final state

    QFinalState *final = new QFinalState(machine);

    //This transition is triggered when the player press space after completing a level

    CustomSpaceTransition *spaceTransition = new CustomSpaceTransition(scene->views().at(0), this, QEvent::KeyPress, Qt::Key_Space);

    spaceTransition->setTargetState(levelState);

    winState->addTransition(spaceTransition);

    //We lost we should reach the final state

    lostState->addTransition(lostState, SIGNAL(finished()), final);

    machine->start();

}

LevelState::LevelState(GraphicsScene *scene, PlayState *game, QState *parent) : QState(parent), scene(scene), game(game)

{

}

void LevelState::onEntry(QEvent *)

{

    initializeLevel();

}

void LevelState::initializeLevel()

{

    //we re-init the boat

    scene->boat->setPos(scene->width()/2, scene->sealLevel() - scene->boat->size().height());

    scene->boat->setCurrentSpeed(0);

    scene->boat->setCurrentDirection(Boat::None);

    scene->boat->setBombsLaunched(0);

    scene->boat->show();

    scene->setFocusItem(scene->boat, Qt::OtherFocusReason);

    scene->boat->run();

    scene->progressItem->setScore(game->score);

    scene->progressItem->setLevel(game->currentLevel + 1);

    GraphicsScene::LevelDescription currentLevelDescription = scene->levelsData.value(game->currentLevel);

    for (int i = 0; i < currentLevelDescription.submarines.size(); ++i ) {

        QPair<int,int> subContent = currentLevelDescription.submarines.at(i);

        GraphicsScene::SubmarineDescription submarineDesc = scene->submarinesData.at(subContent.first);

        for (int j = 0; j < subContent.second; ++j ) {

            SubMarine *sub = new SubMarine(submarineDesc.type, submarineDesc.name, submarineDesc.points);

            scene->addItem(sub);

            int random = (qrand() % 15 + 1);

            qreal x = random == 13 || random == 5 ? 0 : scene->width() - sub->size().width();

            qreal y = scene->height() -(qrand() % 150 + 1) - sub->size().height();

            sub->setPos(x,y);

            sub->setCurrentDirection(x == 0 ? SubMarine::Right : SubMarine::Left);

            sub->setCurrentSpeed(qrand() % 3 + 1);

        }

    }

}

/** Pause State */

PauseState::PauseState(GraphicsScene *scene, QState *parent) : QState(parent),scene(scene)

{

}

void PauseState::onEntry(QEvent *)

{

    AnimationManager::self()->pauseAll();

    scene->boat->setEnabled(false);

}

void PauseState::onExit(QEvent *)

{

    AnimationManager::self()->resumeAll();

    scene->boat->setEnabled(true);

    scene->boat->setFocus();

}

/** Lost State */

LostState::LostState(GraphicsScene *scene, PlayState *game, QState *parent) : QState(parent), scene(scene), game(game)

{

}

void LostState::onEntry(QEvent *)

{

    //The message to display

    QString message = QString("You lose on level %1. Your score is %2.").arg(game->currentLevel+1).arg(game->score);

    //We set the level back to 0

    game->currentLevel = 0;

    //We set the score back to 0

    game->score = 0;

    //We clear the scene

    scene->clearScene();

    //We inform the player

    scene->textInformationItem->setMessage(message);

    scene->textInformationItem->show();

}

void LostState::onExit(QEvent *)

{

    //we hide the information

    scene->textInformationItem->hide();

}

/** Win State */

WinState::WinState(GraphicsScene *scene, PlayState *game, QState *parent) : QState(parent), scene(scene), game(game)

{

}

void WinState::onEntry(QEvent *)

{

    //We clear the scene

    scene->clearScene();

    QString message;

    if (scene->levelsData.size() - 1 != game->currentLevel) {

        message = QString("You win the level %1. Your score is %2.\nPress Space to continue.").arg(game->currentLevel+1).arg(game->score);

        //We increment the level number

        game->currentLevel++;

    } else {

        message = QString("You finish the game on level %1. Your score is %2.").arg(game->currentLevel+1).arg(game->score);

        //We set the level back to 0

        game->currentLevel = 0;

        //We set the score back to 0

        game->score = 0;

    }

    //We inform the player

    scene->textInformationItem->setMessage(message);

    scene->textInformationItem->show();

}

void WinState::onExit(QEvent *)

{

    //we hide the information

    scene->textInformationItem->hide();

}

/** UpdateScore State */

UpdateScoreState::UpdateScoreState(PlayState *g, QState *parent) : QState(parent), game(g)

{

}

/** Win transition */

UpdateScoreTransition::UpdateScoreTransition(GraphicsScene *scene, PlayState *game, QAbstractState *target)

    : QSignalTransition(scene,SIGNAL(subMarineDestroyed(int))),

    game(game), scene(scene)

{

    setTargetState(target);

}

bool UpdateScoreTransition::eventTest(QEvent *event)

{

    if (!QSignalTransition::eventTest(event))

        return false;

    QStateMachine::SignalEvent *se = static_cast<QStateMachine::SignalEvent*>(event);

    game->score += se->arguments().at(0).toInt();

    scene->progressItem->setScore(game->score);

    return true;

}

/** Win transition */

WinTransition::WinTransition(GraphicsScene *scene, PlayState *game, QAbstractState *target)

    : QSignalTransition(scene,SIGNAL(allSubMarineDestroyed(int))),

    game(game), scene(scene)

{

    setTargetState(target);

}

bool WinTransition::eventTest(QEvent *event)

{

    if (!QSignalTransition::eventTest(event))

        return false;

    QStateMachine::SignalEvent *se = static_cast<QStateMachine::SignalEvent*>(event);

    game->score += se->arguments().at(0).toInt();

    scene->progressItem->setScore(game->score);

    return true;

}

/** Space transition */

CustomSpaceTransition::CustomSpaceTransition(QWidget *widget, PlayState *game, QEvent::Type type, int key)

    :   QKeyEventTransition(widget, type, key),

        game(game)

{

}

bool CustomSpaceTransition::eventTest(QEvent *event)

{

    if (!QKeyEventTransition::eventTest(event))

        return false;

    return (game->currentLevel != 0);

}