#include "nmWxPointerPosDlg.h"

#include "iUnitWxBinder.h"
#include "nmDataAnalyzeManager.h"
#include "nmDataGeoRef.h"
#include "nmGuiPlot.h"
#include "ZxBaseUtil.h"

#include <QComboBox>
#include <QDialogButtonBox>
#include <QGridLayout>
#include <QGroupBox>
#include <QHBoxLayout>
#include <QLabel>
#include <QLineEdit>
#include <QPushButton>
#include <QVBoxLayout>
#include <qnumeric.h>
#include <cmath>

namespace
{
    // 与比例尺、测量工具保持相同的三列布局，不固定窗口或控件的像素尺寸。
    QGridLayout* createCoordinateGrid(QGroupBox* pGroup)
    {
        pGroup->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);
        QGridLayout* pGrid = new QGridLayout(pGroup);
        pGrid->setContentsMargins(8, 15, 8, 10);
        pGrid->setHorizontalSpacing(6);
        pGrid->setVerticalSpacing(6);
        pGrid->setColumnStretch(0, 0);
        pGrid->setColumnStretch(1, 8);
        pGrid->setColumnStretch(2, 5);
        return pGrid;
    }

    // 只读而非禁用，保留鼠标选择、键盘导航和复制能力；纯文本字段可跨两列显示。
    QLineEdit* createReadOnlyField(QGridLayout* pGrid, int nRow,
                                   const QString& sLabel, const QString& sObjectName,
                                   int nColumnSpan)
    {
        QWidget* pParent = pGrid->parentWidget();
        QLabel* pLabel = new QLabel(sLabel, pParent);
        pLabel->setAlignment(Qt::AlignRight | Qt::AlignVCenter);
        pLabel->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);
        pGrid->addWidget(pLabel, nRow, 0);

        QLineEdit* pEdit = new QLineEdit(pParent);
        pEdit->setObjectName(sObjectName);
        pEdit->setReadOnly(true);
        pEdit->setAlignment(Qt::AlignLeft | Qt::AlignVCenter);
        pEdit->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);
        pGrid->addWidget(pEdit, nRow, 1, 1, nColumnSpan);
        return pEdit;
    }
}

nmWxPointerPosDlg::nmWxPointerPosDlg(QWidget* parent)
    : iDlgBase(parent),
      m_pLonEdit(nullptr),
      m_pLatEdit(nullptr),
      m_pUtmZoneEdit(nullptr)
{
    for (int nField = 0; nField < LengthFieldCount; ++nField)
    {
        m_pLengthEdits[nField] = nullptr;
        m_pLengthUnits[nField] = nullptr;
        m_bUnitsBound[nField] = false;
    }

    // 浮动窗口的坐标与参考点必须来自同一画布，不能随全局当前分析切换而串用。
    nmGuiPlot* pOwnerPlot = qobject_cast<nmGuiPlot*>(parent);
    if (pOwnerPlot != nullptr)
    {
        m_pDataManager = pOwnerPlot->boundDataManager();
    }

    initUI();
    // 沿用原窗口的初始状态：尚未收到鼠标位置时，展示本地原点及对应参考点。
    setPointerPos(0.0, 0.0);
    setWindowTitle(tr("Pointer position"));
    setWindowFlags((windowFlags() | Qt::WindowStaysOnTopHint) &
                   ~Qt::WindowContextHelpButtonHint);
    // 初始大小由布局、字体和主题决定，允许用户随后调整窗口。
    adjustSize();
}

void nmWxPointerPosDlg::initUI()
{
    QVBoxLayout* pMainLayout = new QVBoxLayout(this);
    pMainLayout->setContentsMargins(12, 10, 12, 0);
    pMainLayout->setSpacing(10);

    QGroupBox* pLocalGroup = new QGroupBox(tr("Local grid"), this);
    QGridLayout* pLocalGrid = createCoordinateGrid(pLocalGroup);
    createLengthField(pLocalGrid, 0, LocalX, tr("X"), "pointerX");
    createLengthField(pLocalGrid, 1, LocalY, tr("Y"), "pointerY");
    pMainLayout->addWidget(pLocalGroup);

    QGroupBox* pGeoGroup = new QGroupBox(tr("Coordinates"), this);
    QGridLayout* pGeoGrid = createCoordinateGrid(pGeoGroup);
    m_pLonEdit = createReadOnlyField(pGeoGrid, 0, tr("Longitude"), "pointerLongitude", 2);
    m_pLatEdit = createReadOnlyField(pGeoGrid, 1, tr("Latitude"), "pointerLatitude", 2);
    // UTM 带是参考点的只读属性，无需创建包含全部分带选项的禁用下拉框。
    m_pUtmZoneEdit = createReadOnlyField(pGeoGrid, 2, tr("UTM zone"), "pointerUtmZone", 2);
    createLengthField(pGeoGrid, 3, Easting, tr("Easting"), "pointerEasting");
    createLengthField(pGeoGrid, 4, Northing, tr("Northing"), "pointerNorthing");
    pMainLayout->addWidget(pGeoGroup);

    // 两个分组按当前标签的推荐宽度对齐，不写死中文字宽或控件宽度。
    int nLabelWidth = 0;
    const QList<QLabel*> listLabels = findChildren<QLabel*>();
    for (int nIndex = 0; nIndex < listLabels.size(); ++nIndex)
    {
        nLabelWidth = qMax(nLabelWidth, listLabels[nIndex]->sizeHint().width());
    }
    pLocalGrid->setColumnMinimumWidth(0, nLabelWidth);
    pGeoGrid->setColumnMinimumWidth(0, nLabelWidth);
    // 纵向余量留在内容与按钮之间，输入框和分组不随窗口拉高而变高。
    pMainLayout->addStretch(1);

    QWidget* pFooter = new QWidget(this);
    pFooter->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);
    QHBoxLayout* pFooterLayout = new QHBoxLayout(pFooter);
    pFooterLayout->setContentsMargins(4, 5, 4, 5);
    pFooterLayout->setSpacing(8);
    pFooterLayout->addStretch();
    QDialogButtonBox* pButtons = new QDialogButtonBox(
            QDialogButtonBox::Close, Qt::Horizontal, pFooter);
    QPushButton* pClose = pButtons->button(QDialogButtonBox::Close);
    pClose->setText(tr("Close"));
    pClose->setIcon(zxLoadIcon("Cancel"));
    pClose->setAutoDefault(false);
    pFooterLayout->addWidget(pButtons);
    pMainLayout->addWidget(pFooter);
    connect(pButtons, SIGNAL(rejected()), this, SLOT(reject()));
}

void nmWxPointerPosDlg::createLengthField(QGridLayout* pGrid, int nRow,
                                          LengthField field, const QString& sLabel,
                                          const QString& sObjectName)
{
    QLineEdit* pEdit = createReadOnlyField(pGrid, nRow, sLabel, sObjectName, 1);
    QComboBox* pUnit = new QComboBox(pGrid->parentWidget());
    pUnit->setObjectName(sObjectName + "Unit");
    pUnit->setSizeAdjustPolicy(QComboBox::AdjustToContents);
    pUnit->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);
    pGrid->addWidget(pUnit, nRow, 2);

    // 空参数标识配合 m 识别长度单位组，避免借用井参数而附带不适用的数值范围。
    pUnit->addItem("m");
    m_pLengthEdits[field] = pEdit;
    m_pLengthUnits[field] = pUnit;
    m_bUnitsBound[field] = bindUnitPairWxs(pEdit, pUnit, QString(), false);
    m_bUnitsBound[field] = m_bUnitsBound[field] && m_pUnitBinder != nullptr;
    // 初次有效值到达前保持空白；绑定失败时也不显示未经换算的坐标。
    setLengthValue(field, 0.0, false);
}

void nmWxPointerPosDlg::setLengthValue(LengthField field, double dValue, bool bValid)
{
    const bool bCanDisplay = bValid && qIsFinite(dValue) && m_bUnitsBound[field];
    m_pLengthUnits[field]->setEnabled(bCanDisplay);
    if (m_bUnitsBound[field])
    {
        // 只更新米制基准值，不重建单位列表，鼠标移动后仍保留用户的显示单位。
        // 无数据时同步清除绑定器的旧值，避免后续单位切换使过期坐标重新出现。
        m_pUnitBinder->setBaseValue(m_pLengthEdits[field], bCanDisplay ? dValue : 0.0);
    }
    if (!bCanDisplay)
    {
        m_pLengthEdits[field]->clear();
    }
}

void nmWxPointerPosDlg::clearGeographicValues()
{
    m_pLonEdit->clear();
    m_pLatEdit->clear();
    m_pUtmZoneEdit->clear();
    setLengthValue(Easting, 0.0, false);
    setLengthValue(Northing, 0.0, false);
}

void nmWxPointerPosDlg::setPointerPos(double x, double y)
{
    // 若所属分析已释放或画布已改绑，不把新画布的坐标套用到旧分析的参考点。
    nmGuiPlot* pOwnerPlot = qobject_cast<nmGuiPlot*>(parentWidget());
    const bool bValidPoint = !m_pDataManager.isNull() && pOwnerPlot != nullptr &&
            pOwnerPlot->boundDataManager() == m_pDataManager.data() &&
            qIsFinite(x) && qIsFinite(y);
    setLengthValue(LocalX, x, bValidPoint);
    setLengthValue(LocalY, y, bValidPoint);
    if (!bValidPoint)
    {
        clearGeographicValues();
        return;
    }

    // 每次从所属分析取最新对象，覆盖打开窗口后才设置参考点、参考点重建等情况。
    nmDataGeoRef* pGeoRef = m_pDataManager->getGeoRefData();
    if (pGeoRef == nullptr)
    {
        clearGeographicValues();
        return;
    }

    const QString sZone = pGeoRef->getUtmZone().getValue().toString().trimmed();
    bool bZoneOK = false;
    const int nZone = sZone.left(2).toInt(&bZoneOK);
    const QString sBands("CDEFGHJKLMNPQRSTUVWX");
    if (!bZoneOK || nZone < 1 || nZone > 60 || sZone.size() != 3 ||
            !sBands.contains(sZone.at(2)))
    {
        clearGeographicValues();
        return;
    }

    // 空字段不能按 0 参与换算；无效数据只清空显示，不弹校验提示。
    bool bEastingOK = false;
    bool bNorthingOK = false;
    bool bLongitudeOK = false;
    bool bLatitudeOK = false;
    const double dBaseEasting = pGeoRef->getEasting().getValue().toDouble(&bEastingOK);
    const double dBaseNorthing = pGeoRef->getNorthing().getValue().toDouble(&bNorthingOK);
    const double dBaseLongitude = pGeoRef->getLongitude().getValue().toDouble(&bLongitudeOK);
    const double dBaseLatitude = pGeoRef->getLatitude().getValue().toDouble(&bLatitudeOK);
    if (!bEastingOK || !bNorthingOK || !bLongitudeOK || !bLatitudeOK ||
            !qIsFinite(dBaseEasting) || !qIsFinite(dBaseNorthing) ||
            !qIsFinite(dBaseLongitude) || !qIsFinite(dBaseLatitude) ||
            qAbs(dBaseLongitude) > 180.0 || qAbs(dBaseLatitude) > 90.0)
    {
        clearGeographicValues();
        return;
    }

    // 模型坐标为相对参考点的米制偏移，显示单位不参与坐标计算。
    const double dEasting = dBaseEasting + x;
    const double dNorthing = dBaseNorthing + y;
    if (!qIsFinite(dEasting) || !qIsFinite(dNorthing))
    {
        clearGeographicValues();
        return;
    }
    m_pUtmZoneEdit->setText(sZone);
    setLengthValue(Easting, dEasting, true);
    setLengthValue(Northing, dNorthing, true);

    // 沿用现有的小范围经纬度近似换算，并非严格的 UTM 反投影。
    // 极点附近经度换算分母趋近于零，此时保留平面坐标，清空无法可靠计算的经纬度。
    const double dMetersPerDegreeLat = 111111.0;
    const double dPi = 3.14159265358979323846;
    const double dMetersPerDegreeLon = dMetersPerDegreeLat *
            std::cos(dBaseLatitude * dPi / 180.0);
    if (qAbs(dMetersPerDegreeLon) < 1.0e-6)
    {
        m_pLonEdit->clear();
        m_pLatEdit->clear();
        return;
    }

    const double dLatitude = dBaseLatitude + y / dMetersPerDegreeLat;
    const double dLongitude = dBaseLongitude + x / dMetersPerDegreeLon;
    m_pLonEdit->setText(formatCoordinate(dLongitude, false));
    m_pLatEdit->setText(formatCoordinate(dLatitude, true));
}

QString nmWxPointerPosDlg::formatCoordinate(double dCoordinate, bool bLatitude) const
{
    if (!qIsFinite(dCoordinate) || qAbs(dCoordinate) > (bLatitude ? 90.0 : 180.0))
    {
        return QString();
    }

    // 先按百分之一秒整体取整再分解，自动处理 59.995 秒进位，避免出现 60 秒。
    // 经纬度范围已限定，最大值为 180 * 3600 * 100，不会超出 int 范围。
    const int nTotalHundredths = qRound(qAbs(dCoordinate) * 360000.0);
    const int nDegrees = nTotalHundredths / 360000;
    const int nMinutes = (nTotalHundredths / 6000) % 60;
    const double dSeconds = (nTotalHundredths % 6000) / 100.0;
    const QString sDirection = bLatitude ?
            (dCoordinate >= 0.0 ? "N" : "S") : (dCoordinate >= 0.0 ? "E" : "W");
    return QString("%1%2%3%4%5%6%7")
            .arg(nDegrees, 2, 10, QLatin1Char('0')).arg(tr("deg"))
            .arg(nMinutes, 2, 10, QLatin1Char('0')).arg(tr("min"))
            .arg(dSeconds, 5, 'f', 2, QLatin1Char('0')).arg(tr("sec")).arg(sDirection);
}