#include "textviewerwidget.h"
#include <QFileInfo>
#include <QHeaderView>

TextViewerWidget::TextViewerWidget(QWidget *parent)
    : QWidget(parent)
{
    auto *mainLayout = new QVBoxLayout(this);
    mainLayout->setContentsMargins(0, 0, 0, 0);
    mainLayout->setSpacing(0);

    // Info label at top
    mInfoLabel = new QLabel(this);
    mInfoLabel->setContentsMargins(8, 4, 8, 4);
    mainLayout->addWidget(mInfoLabel);

    // Splitter for text view and metadata
    mSplitter = new QSplitter(Qt::Horizontal, this);
    mainLayout->addWidget(mSplitter, 1);

    // Text editor (read-only)
    mTextEdit = new QPlainTextEdit(this);
    mTextEdit->setReadOnly(true);
    mTextEdit->setLineWrapMode(QPlainTextEdit::NoWrap);

    // Use monospace font
    QFont monoFont("Consolas", 10);
    monoFont.setStyleHint(QFont::Monospace);
    mTextEdit->setFont(monoFont);

    mSplitter->addWidget(mTextEdit);

    // Metadata tree on the right
    mMetadataTree = new QTreeWidget(this);
    mMetadataTree->setHeaderLabels({"Property", "Value"});
    mMetadataTree->setColumnCount(2);
    mMetadataTree->header()->setStretchLastSection(true);
    mMetadataTree->setMinimumWidth(200);
    mSplitter->addWidget(mMetadataTree);

    // Set initial splitter sizes (80% text, 20% metadata)
    mSplitter->setSizes({800, 200});

    // Connect to theme changes
    connect(&Settings::instance(), &Settings::themeChanged,
            this, &TextViewerWidget::applyTheme);
    applyTheme(Settings::instance().theme());
}

void TextViewerWidget::setData(const QByteArray &data, const QString &filename)
{
    mData = data;
    mFilename = filename;

    // Set text content
    QString text = QString::fromUtf8(data);
    mTextEdit->setPlainText(text);

    // Update info label
    QFileInfo fi(filename);
    int lineCount = text.count('\n') + 1;
    mInfoLabel->setText(QString("%1 | %2 bytes | %3 lines")
                            .arg(filename)
                            .arg(data.size())
                            .arg(lineCount));

    // Setup syntax highlighting based on extension
    setupSyntaxHighlighting(fi.suffix().toLower());
}

void TextViewerWidget::setMetadata(const QVariantMap &metadata)
{
    mMetadataTree->clear();

    for (auto it = metadata.constBegin(); it != metadata.constEnd(); ++it) {
        const QString &key = it.key();
        const QVariant &val = it.value();

        // Skip internal fields and large binary data
        if (key.startsWith('_') && key != "_name" && key != "_type")
            continue;
        if (val.typeId() == QMetaType::QByteArray)
            continue;

        auto *item = new QTreeWidgetItem(mMetadataTree);
        item->setText(0, key);

        if (val.typeId() == QMetaType::QVariantMap) {
            item->setText(1, QString("{%1 fields}").arg(val.toMap().size()));
        } else if (val.typeId() == QMetaType::QVariantList) {
            item->setText(1, QString("[%1 items]").arg(val.toList().size()));
        } else {
            item->setText(1, val.toString());
        }
    }

    mMetadataTree->resizeColumnToContents(0);
}

void TextViewerWidget::applyTheme(const Theme &theme)
{
    mCurrentTheme = theme;

    // Style the text editor
    QString textStyle = QString(
        "QPlainTextEdit {"
        "  background-color: %1;"
        "  color: %2;"
        "  border: 1px solid %3;"
        "  selection-background-color: %4;"
        "}"
    ).arg(theme.panelColor, theme.textColor, theme.borderColor, theme.accentColor);

    mTextEdit->setStyleSheet(textStyle);

    // Style info label
    mInfoLabel->setStyleSheet(QString(
        "QLabel {"
        "  background-color: %1;"
        "  color: %2;"
        "  border-bottom: 1px solid %3;"
        "}"
    ).arg(theme.panelColor, theme.textColorMuted, theme.borderColor));

    // Style metadata tree
    mMetadataTree->setStyleSheet(QString(
        "QTreeWidget {"
        "  background-color: %1;"
        "  color: %2;"
        "  border: 1px solid %3;"
        "}"
        "QTreeWidget::item:selected {"
        "  background-color: %4;"
        "}"
        "QHeaderView::section {"
        "  background-color: %1;"
        "  color: %2;"
        "  border: 1px solid %3;"
        "  padding: 4px;"
        "}"
    ).arg(theme.panelColor, theme.textColor, theme.borderColor, theme.accentColor));
}

void TextViewerWidget::setupSyntaxHighlighting(const QString &extension)
{
    // Basic syntax highlighting could be added here in the future
    // For now, just adjust display based on file type
    Q_UNUSED(extension)
}