#include "nmVTKViewCommandController.h"

#include "nmWxVTKRenderContainerWidget.h"

#include <QAction>
#include <QCoreApplication>
#include <QIcon>
#include <QList>
#include <QMenu>
#include <QToolBar>

namespace {

// 图标沿用现有部署目录，命令控制器不复制或拥有图片资源。
QString commandIconPath(const QString& sFileName)
{
    const QString sApplicationDir = QCoreApplication::applicationDirPath();
    return sApplicationDir.section('/', 0, -2) +
            "/Res/Icon/" + sFileName;
}

}

nmVTKViewCommandController::nmVTKViewCommandController(
        nmWxVTKRenderContainerWidget* pContainer,
        QObject* pParent)
    : QObject(pParent),
      m_pContainer(pContainer),
      m_eCapabilities(0),
      m_bViewAvailable(false)
{
    for(int nIndex = 0; nIndex < ViewCommandCount; ++nIndex) {
        m_pActions[nIndex] = NULL;
    }

    // QAction 只在构造阶段创建一次，后续所有菜单和工具栏复用这些实例。
    createAction(ViewCommand_ZoomIn, tr("Zoom In"), "ZoomIn.png",
                 SLOT(zoomIn()));
    createAction(ViewCommand_ZoomOut, tr("Zoom Out"), "ZoomOut.png",
                 SLOT(zoomOut()));
    createAction(ViewCommand_Fit, tr("Fit to Window"),
                 "ZoomSelfAdaptation.png", SLOT(fitView()));
    createAction(ViewCommand_Top, tr("Top View"), "Map2D.png",
                 SLOT(setTopView()));
    createAction(ViewCommand_Front, tr("Front View"), QString(),
                 SLOT(setFrontView()));
    createAction(ViewCommand_Right, tr("Right View"), QString(),
                 SLOT(setRightView()));
    createAction(ViewCommand_Isometric, tr("Isometric View"), QString(),
                 SLOT(setIsometricView()));
    createAction(ViewCommand_ResetRotationCenter,
                 tr("Reset Rotation Center"), QString(),
                 SLOT(resetRotationCenter()));
    createAction(ViewCommand_SaveImage, tr("Save as Image"), "SaveImg.png",
                 SLOT(saveImage()));
    createAction(ViewCommand_CopyImage, tr("Copy Image"), "Copy.png",
                 SLOT(copyImage()));
    createAction(ViewCommand_Print, tr("Print"), "Print.png",
                 SLOT(printImage()));
    createAction(ViewCommand_PrintPreview, tr("Print Preview"),
                 "PrePrint.png", SLOT(printPreview()));
}

nmVTKViewCommandController::~nmVTKViewCommandController()
{
    // QAction 由 QObject 父子关系释放；这里只解除非所有权容器引用。
    m_pContainer = NULL;
}

void nmVTKViewCommandController::setCapabilities(ViewCommands eCommands)
{
    m_eCapabilities = eCommands;
    updateActionStates();
}

nmVTKViewCommandController::ViewCommands
nmVTKViewCommandController::getCapabilities() const
{
    return m_eCapabilities;
}

QAction* nmVTKViewCommandController::getAction(
        ViewCommand eCommand) const
{
    const int nIndex = actionIndex(eCommand);
    return nIndex >= 0 ? m_pActions[nIndex] : NULL;
}

void nmVTKViewCommandController::populateToolBar(QToolBar* pToolBar) const
{
    if(pToolBar == NULL) {
        return;
    }

    const ViewCommand eNavigationCommands[] = {
        ViewCommand_ZoomIn,
        ViewCommand_ZoomOut,
        ViewCommand_Fit,
        ViewCommand_Top,
        ViewCommand_Front,
        ViewCommand_Right,
        ViewCommand_Isometric,
        ViewCommand_ResetRotationCenter
    };
    bool bHasNavigation = false;
    for(int nIndex = 0; nIndex < 8; ++nIndex) {
        if(supports(eNavigationCommands[nIndex])) {
            pToolBar->addAction(getAction(eNavigationCommands[nIndex]));
            bHasNavigation = true;
        }
    }

    // 保存和打印只进入右键菜单；复制是适合高频使用的唯一输出工具栏命令。
    if(supports(ViewCommand_CopyImage)) {
        if(bHasNavigation) {
            pToolBar->addSeparator();
        }
        pToolBar->addAction(getAction(ViewCommand_CopyImage));
    }
}

void nmVTKViewCommandController::populateContextMenu(QMenu* pMenu) const
{
    if(pMenu == NULL) {
        return;
    }

    bool bHasLeadingCommands = false;
    if(supports(ViewCommand_SaveImage)) {
        pMenu->addAction(getAction(ViewCommand_SaveImage));
        bHasLeadingCommands = true;
    }
    if(supports(ViewCommand_CopyImage)) {
        pMenu->addAction(getAction(ViewCommand_CopyImage));
        bHasLeadingCommands = true;
    }

    const ViewCommand eViewCommands[] = {
        ViewCommand_ZoomIn,
        ViewCommand_ZoomOut,
        ViewCommand_Fit,
        ViewCommand_Top,
        ViewCommand_Front,
        ViewCommand_Right,
        ViewCommand_Isometric,
        ViewCommand_ResetRotationCenter
    };
    bool bHasViewCommands = false;
    for(int nIndex = 0; nIndex < 8; ++nIndex) {
        bHasViewCommands = bHasViewCommands || supports(eViewCommands[nIndex]);
    }
    if(bHasViewCommands) {
        if(bHasLeadingCommands) {
            pMenu->addSeparator();
        }
        QMenu* pViewMenu = pMenu->addMenu(tr("View"));
        for(int nIndex = 0; nIndex < 8; ++nIndex) {
            if(supports(eViewCommands[nIndex])) {
                pViewMenu->addAction(getAction(eViewCommands[nIndex]));
            }
        }
        bHasLeadingCommands = true;
    }

    // 扩展项由业务层直接追加；若存在，则在前后自动补齐分隔线。
    const int nActionCount = pMenu->actions().size();
    emit contextMenuAboutToShow(pMenu);
    const QList<QAction*> listActions = pMenu->actions();
    const bool bHasExtension = listActions.size() > nActionCount;
    if(bHasExtension && bHasLeadingCommands) {
        pMenu->insertSeparator(listActions.at(nActionCount));
    }

    const bool bHasPrint = supports(ViewCommand_Print) ||
            supports(ViewCommand_PrintPreview);
    if(bHasPrint && (bHasLeadingCommands || bHasExtension)) {
        pMenu->addSeparator();
    }
    if(supports(ViewCommand_Print)) {
        pMenu->addAction(getAction(ViewCommand_Print));
    }
    if(supports(ViewCommand_PrintPreview)) {
        pMenu->addAction(getAction(ViewCommand_PrintPreview));
    }
}

void nmVTKViewCommandController::setViewAvailable(bool bAvailable)
{
    m_bViewAvailable = bAvailable;
    updateActionStates();
}

bool nmVTKViewCommandController::isViewAvailable() const
{
    return m_bViewAvailable;
}

QAction* nmVTKViewCommandController::createAction(
        ViewCommand eCommand,
        const QString& sText,
        const QString& sIconFile,
        const char* pSlot)
{
    const int nIndex = actionIndex(eCommand);
    if(nIndex < 0 || m_pActions[nIndex] != NULL) {
        return NULL;
    }

    QAction* pAction = sIconFile.isEmpty()
            ? new QAction(sText, this)
            : new QAction(QIcon(commandIconPath(sIconFile)), sText, this);
    pAction->setToolTip(sText);
    pAction->setEnabled(false);
    if(m_pContainer != NULL && pSlot != NULL) {
        connect(pAction, SIGNAL(triggered()), m_pContainer, pSlot);
    }
    m_pActions[nIndex] = pAction;
    return pAction;
}

int nmVTKViewCommandController::actionIndex(ViewCommand eCommand) const
{
    switch(eCommand) {
    case ViewCommand_ZoomIn: return 0;
    case ViewCommand_ZoomOut: return 1;
    case ViewCommand_Fit: return 2;
    case ViewCommand_Top: return 3;
    case ViewCommand_Front: return 4;
    case ViewCommand_Right: return 5;
    case ViewCommand_Isometric: return 6;
    case ViewCommand_ResetRotationCenter: return 7;
    case ViewCommand_SaveImage: return 8;
    case ViewCommand_CopyImage: return 9;
    case ViewCommand_Print: return 10;
    case ViewCommand_PrintPreview: return 11;
    default: return -1;
    }
}

bool nmVTKViewCommandController::supports(ViewCommand eCommand) const
{
    return m_eCapabilities.testFlag(eCommand);
}

void nmVTKViewCommandController::updateActionStates()
{
    const ViewCommand eCommands[ViewCommandCount] = {
        ViewCommand_ZoomIn,
        ViewCommand_ZoomOut,
        ViewCommand_Fit,
        ViewCommand_Top,
        ViewCommand_Front,
        ViewCommand_Right,
        ViewCommand_Isometric,
        ViewCommand_ResetRotationCenter,
        ViewCommand_SaveImage,
        ViewCommand_CopyImage,
        ViewCommand_Print,
        ViewCommand_PrintPreview
    };
    for(int nIndex = 0; nIndex < ViewCommandCount; ++nIndex) {
        QAction* pAction = m_pActions[nIndex];
        if(pAction != NULL) {
            const bool bSupported = supports(eCommands[nIndex]);
            pAction->setVisible(bSupported);
            pAction->setEnabled(bSupported && m_bViewAvailable);
        }
    }
}