#include "tagpanel.h"
#include <QHeaderView>
#include <QRegularExpression>
#include <QApplication>
#include <QClipboard>

TagPanel::TagPanel(const QString &tag, QWidget *parent)
    : QGroupBox(QStringLiteral("[%1]").arg(tag), parent)
    , m_tag(tag)
{
    auto *layout = new QVBoxLayout(this);
    layout->setContentsMargins(6, 14, 6, 6);
    layout->setSpacing(4);

    m_table = new QTableWidget(0, 2, this);
    m_table->setHorizontalHeaderLabels({tr("Key"), tr("Value")});
    m_table->horizontalHeader()->setStretchLastSection(true);
    m_table->verticalHeader()->hide();
    m_table->setEditTriggers(QAbstractItemView::NoEditTriggers);
    m_table->setAlternatingRowColors(true);
    m_table->setMaximumHeight(220);
    m_table->verticalHeader()->setDefaultSectionSize(22);
    layout->addWidget(m_table);

    m_rawLabel = new QLabel(this);
    m_rawLabel->setWordWrap(true);
    m_rawLabel->setStyleSheet("font-family: monospace;");
    m_rawLabel->hide();
    layout->addWidget(m_rawLabel);

    auto *btnRow = new QHBoxLayout();
    btnRow->addStretch();
    auto *copyBtn = new QPushButton(tr("📋 Copy"), this);
    copyBtn->setToolTip(tr("Copy current tag values to clipboard"));
    copyBtn->setMaximumWidth(90);
    connect(copyBtn, &QPushButton::clicked, this, &TagPanel::copyToClipboard);
    btnRow->addWidget(copyBtn);
    layout->addLayout(btnRow);
}

void TagPanel::update(const QString &value)
{
    static const QRegularExpression kvRe(R"((\w+)=(\S+))");
    if (kvRe.match(value).hasMatch()) {
        parseKeyValue(value);
        m_rawLabel->hide();
        m_table->show();
    } else {
        showRaw(value);
        m_table->hide();
        m_rawLabel->show();
    }
}

void TagPanel::parseKeyValue(const QString &value)
{
    static const QRegularExpression kvRe(R"((\w+)=(\S+))");
    auto it = kvRe.globalMatch(value);
    while (it.hasNext()) {
        const auto match = it.next();
        const QString key   = match.captured(1);
        const QString raw   = match.captured(2);

        // Split on ';' -> list of values. A plain (non-list) value yields
        // a QStringList with exactly one element, which still goes through
        // the same code path for consistency.
        QStringList values = raw.split(';', Qt::SkipEmptyParts);
        if (values.isEmpty())
            values << raw;   // preserve even an empty/odd value as-is

        setKeyValues(key, values);
    }
}

void TagPanel::setKeyValues(const QString &key, const QStringList &values)
{
    const int newCount = values.size();

    if (m_keyRanges.contains(key)) {
        // Key already exists – remove its current rows, then re-insert at
        // the same starting position with the new row count.
        const KeyRange old = m_keyRanges[key];
        for (int i = 0; i < old.count; ++i)
            m_table->removeRow(old.firstRow);

        // Shift all OTHER key ranges that started after this one
        for (auto it = m_keyRanges.begin(); it != m_keyRanges.end(); ++it) {
            if (it.key() != key && it->firstRow > old.firstRow)
                it->firstRow += (newCount - old.count);
        }

        int insertAt = old.firstRow;
        for (int i = 0; i < newCount; ++i) {
            m_table->insertRow(insertAt + i);
            auto *keyItem = new QTableWidgetItem(i == 0 ? key : QString());
            auto *valItem = new QTableWidgetItem(values[i]);
            valItem->setBackground(QColor(0x2d, 0x5a, 0x2d));   // flash green on update
            m_table->setItem(insertAt + i, 0, keyItem);
            m_table->setItem(insertAt + i, 1, valItem);
        }
        m_keyRanges[key] = {insertAt, newCount};
    } else {
        // New key – append at the bottom
        const int insertAt = m_table->rowCount();
        for (int i = 0; i < newCount; ++i) {
            m_table->insertRow(insertAt + i);
            auto *keyItem = new QTableWidgetItem(i == 0 ? key : QString());
            auto *valItem = new QTableWidgetItem(values[i]);
            valItem->setBackground(QColor(0x2d, 0x5a, 0x2d));
            m_table->setItem(insertAt + i, 0, keyItem);
            m_table->setItem(insertAt + i, 1, valItem);
        }
        m_keyRanges[key] = {insertAt, newCount};
    }
}

void TagPanel::showRaw(const QString &value)
{
    m_rawLabel->setText(value);
}

void TagPanel::copyToClipboard()
{
    QStringList lines;
    lines << QStringLiteral("[%1]").arg(m_tag);

    if (m_table->isVisible()) {
        QString lastKey;
        for (int r = 0; r < m_table->rowCount(); ++r) {
            const QString key = m_table->item(r, 0)->text();
            const QString val = m_table->item(r, 1)->text();
            if (!key.isEmpty()) {
                lines << QStringLiteral("  %1 = %2").arg(key, val);
                lastKey = key;
            } else {
                lines << QStringLiteral("      %1").arg(val);   // continuation row
            }
        }
    } else {
        lines << QStringLiteral("  %1").arg(m_rawLabel->text());
    }

    QApplication::clipboard()->setText(lines.join('\n'));
}