#include "CMindView.h"

#include "CRectItem.h"
#include "CLineItem.h"
#include "CTextItem.h"
#include "CMind.h"
#include "CNodeItem.h"

#include <QMenu>
#include <QContextMenuEvent>

#include <QDebug>

CMindView::CMindView(QWidget *parent) : QGraphicsView(new QGraphicsScene(), parent)
{
    setRenderHints(QPainter::Antialiasing);  // 抗锯齿

    //    setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOn);

    m_mind  = new CMind(this);
    m_group = new QGraphicsItemGroup();
    m_group->setFlags(QGraphicsItem::ItemIsMovable);
    m_group->setHandlesChildEvents(false);

    scene()->addItem(m_group);

    setStyleSheet("QGraphicsView {border: 1px solid rgba(0, 0, 0, 0.073);background: rgb(244, 244, "
                  "255);}");
}

CMind *CMindView::mind() const
{
    return m_mind;
}

void CMindView::setNodeList(QList<CNodeData> list)
{
    clear();

    for (int i = 0; i < list.count() - 1; i++) {
        for (int j = 0; j < list.count() - 1 - i; j++) {
            if ((list[j].pNumber > list[j + 1].pNumber)
                || ((list[j].pNumber == list[j + 1].pNumber) && (list[j].number > list[j + 1].number))) {
                CNodeData temp = list[j];
                list[j]        = list[j + 1];
                list[j + 1]    = temp;
            }
        }
    }

    for (int i = 0; i < list.count(); i++) {
        CNodeData n = list[i];
        if (m_mind->canAddNode(n)) {
            addNode(n);
        }
    }
    if (m_root != nullptr) {
        m_root->endEditing();
    }
}

void CMindView::addNode(CNodeData n)
{
    m_mind->addNode(n);
    CNodeItem *item = new CNodeItem(n);
    item->textItem()->setAllowEdit(m_allowEdit);
    item->rectItem()->setAllowEdit(m_allowEdit);
    connect(item, &CNodeItem::sigEditNode, this, &CMindView::slotEditNode);
    connect(item, &CNodeItem::sigAddSubItem, this, &CMindView::slotAddSubNode);
    connect(item, &CNodeItem::sigRemoveItem, this, &CMindView::slotRemoveNode);
    connect(item, &CNodeItem::sigTextChanged, this, &CMindView::slotTextChanged);
    connect(item, &CNodeItem::sigWillBeginEditing, this, &CMindView::slotWillBeginEditing);

    if (m_root == nullptr) {
        m_root = item;
    } else {
        m_root->endEditing();
        m_root->addSubNode(item);
    }

    item->textItem()->beginEditing();

    refreshItems();
}

void CMindView::updateNode(CNodeData n)
{
    m_mind->updateNode(n);
    CNodeItem *item = m_root->subNode(n.number);
    if (item != nullptr) {
        item->setData(n);
        refreshItems();
    }
}

void CMindView::clear()
{
    m_mind->clear();

    delete m_root;
    m_root = nullptr;

    refreshItems();
}

void CMindView::refreshItems()
{
    for (QGraphicsItem *item : m_items) {
        scene()->removeItem(item);
    }
    m_items.clear();

    refreshNodeGeometry(m_root);
    collectItems(m_root);
    for (QGraphicsItem *item : m_items) {
        m_group->addToGroup(item);
    }

    moveToCenter();
}

void CMindView::collectItems(CNodeItem *node)
{
    if (node == nullptr) {
        return;
    }

    m_items.append(node->rectItem());
    for (QObject *o : node->children()) {
        CNodeItem *n = dynamic_cast<CNodeItem *>(o);
        collectItems(n);
    }
}

void CMindView::setALignNodes(bool align)
{
    m_align = align;
}

CNodeItem *CMindView::root() const
{
    return m_root;
}

void CMindView::refreshNodeGeometry(CNodeItem *node, QPointF topLeft)
{
    /// 边框
    if (node == nullptr) {
        return;
    }

    QRect borderRect = QRect(topLeft.x(), topLeft.y() + (node->treeHeight() - node->borderHeight()) / 2,
                             node->borderWidth(), node->borderHeight());
    node->rectItem()->setRect(borderRect);

    /// 文本
    QPointF textPos = QPointF(borderRect.left() + node->xMargin(),
                              borderRect.top() + (node->borderHeight() - node->textHeight()) / 2);
    node->textItem()->setPos(textPos);
    node->textItem()->setTextWidth(borderRect.width() - node->xMargin() * 2);

    node->rectItem()->setPos(QPoint(0, 0));

    /// 子节点
    int x = borderRect.right() + node->hNodeSpace();
    if (m_align) {
        x = borderRect.left() + m_root->maxBorderWidthOfLevel(node->depth()) + node->hNodeSpace();
    }

    int y = topLeft.y();
    if (node->borderHeight() > node->childrenHeight()) {
        y += (node->borderHeight() - node->childrenHeight()) / 2;
    }

    for (QObject *obj : node->children()) {
        CNodeItem *subNode = dynamic_cast<CNodeItem *>(obj);
        refreshNodeGeometry(subNode, QPointF(x, y));
        y += subNode->treeHeight() + subNode->vNodeSpace();

        subNode->lineItem()->setStartPos(node->rectItem()->centerRight());
        subNode->lineItem()->setEndPos(subNode->rectItem()->centerLeft());
    }

    node->setHighlighted(m_mind->isInvalidated(node->data().number));
}

void CMindView::mousePressEvent(QMouseEvent *event)
{
    QGraphicsItem *item = itemAt(event->pos());
    CTextItem *text     = dynamic_cast<CTextItem *>(item);
    if (text == nullptr && m_root != nullptr && m_root->editingNode() != nullptr) {
        m_root->endEditing();
    }

    if (isCloseToEdge()) {
        moveToCenter();
    }

    m_isMovingItem =
            item != nullptr && (item->flags() & QGraphicsObject::ItemIsMovable) == QGraphicsObject::ItemIsMovable;

    updateCursor(event->pos());

    QGraphicsView::mousePressEvent(event);
}

void CMindView::mouseMoveEvent(QMouseEvent *event)
{
    QGraphicsView::mouseMoveEvent(event);
    updateCursor(event->pos());
}

void CMindView::mouseReleaseEvent(QMouseEvent *event)
{
    m_isMovingItem = false;
    updateCursor(event->pos());
    QGraphicsView::mouseReleaseEvent(event);
}

bool CMindView::isCloseToEdge()
{
    qreal left        = m_group->pos().x();
    qreal right       = m_group->pos().x() + m_group->boundingRect().width();
    qreal top         = m_group->pos().y();
    qreal bottom      = m_group->pos().y() + m_group->boundingRect().height();
    qreal allowedArea = 0.8;

    return left > width() * allowedArea || right < width() * (1 - allowedArea) || top > height() * allowedArea
            || bottom < height() * (1 - allowedArea);
}

void CMindView::moveToCenter()
{
    QRectF r = m_group->childrenBoundingRect();
    setSceneRect(QRectF(QPointF(), r.size()));
}

void CMindView::testData()
{
    int num[19]  = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18 };
    int pNum[19] = { -1, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4 };
    QStringList name = { "技术方案测试平台", "展开与撤收能力", "覆盖能力",     "传输能力", "组网能力",
                         "展开时间",         "撤收时间",       "携行重量",     "操作人数", "地域覆盖范围",
                         "节点小区覆盖",     "动中通",         "最高传输速度", "误码率",   "通信时延",
                         "平均入网时间",     "业务成功率",     "组网模式",     "网络规模" };

    for (int i = 0; i < 19; i++) {
        CNodeData n = CNodeData(0, 32, num[i], pNum[i]);
        n.name      = name[i];
        addNode(n);
    }
}

void CMindView::updateCursor(QPoint pos)
{
    QGraphicsItem *item = itemAt(pos);

    if (m_isMovingItem) {
        setCursor(Qt::ClosedHandCursor);
    } else {
        bool movable =
                item != nullptr && (item->flags() & QGraphicsObject::ItemIsMovable) == QGraphicsObject::ItemIsMovable;

        if (movable) {
            setCursor(Qt::OpenHandCursor);
        } else {
            setCursor(Qt::ArrowCursor);
        }
    }
}

void CMindView::setAllowEdit(bool allow)
{
    m_allowEdit = allow;
}

bool CMindView::allowEdit() const
{
    return m_allowEdit;
}

void CMindView::slotEditNode(CNodeData n)
{
    emit sigEditNode(n);
}

void CMindView::slotAddSubNode(int pNumber)
{
    emit sigAddSubNode(pNumber);
}

void CMindView::slotRemoveNode(int number)
{
    m_mind->removeNode(number);
    if (number == m_root->data().number) {
        clear();
    } else {
        m_root->removeNode(number);
    }
    refreshItems();
}

void CMindView::slotTextChanged()
{
    CNodeItem *item = (CNodeItem *)sender();
    refreshItems();
    emit sigNodeChanged(item->data());
}

void CMindView::slotWillBeginEditing()
{
    m_root->endEditing();
}