// SPDX-FileCopyrightText: 2017 Konstantinos Sideris <siderisk@auth.gr>
// SPDX-FileCopyrightText: 2021 Nheko Contributors
//
// SPDX-License-Identifier: GPL-3.0-or-later

#include <QBuffer>
#include <QFile>
#include <QFileInfo>
#include <QHBoxLayout>
#include <QMimeDatabase>
#include <QVBoxLayout>

#include "dialogs/PreviewUploadOverlay.h"

#include "Config.h"
#include "Logging.h"
#include "MainWindow.h"
#include "Utils.h"

using namespace dialogs;

constexpr const char *DEFAULT = "Upload %1?";
constexpr const char *ERR_MSG = "Failed to load image type '%1'. Continue upload?";

PreviewUploadOverlay::PreviewUploadOverlay(QWidget *parent)
  : QWidget{parent}
  , titleLabel_{this}
  , fileName_{this}
  , upload_{tr("Upload"), this}
  , cancel_{tr("Cancel"), this}
{
    auto hlayout = new QHBoxLayout;
    hlayout->addStretch(1);
    hlayout->addWidget(&cancel_);
    hlayout->addWidget(&upload_);
    hlayout->setMargin(0);

    auto vlayout = new QVBoxLayout{this};
    vlayout->addWidget(&titleLabel_);
    vlayout->addWidget(&infoLabel_);
    vlayout->addWidget(&fileName_);
    vlayout->addLayout(hlayout);
    vlayout->setSpacing(conf::modals::WIDGET_SPACING);
    vlayout->setMargin(conf::modals::WIDGET_MARGIN);

    upload_.setDefault(true);
    connect(&upload_, &QPushButton::clicked, [this]() {
        emit confirmUpload(data_, mediaType_, fileName_.text());
        close();
    });

    connect(&fileName_, &QLineEdit::returnPressed, this, [this]() {
        emit confirmUpload(data_, mediaType_, fileName_.text());
        close();
    });

    connect(&cancel_, &QPushButton::clicked, this, [this]() {
        emit aborted();
        close();
    });
}

void
PreviewUploadOverlay::init()
{
    QSize winsize;
    QPoint center;

    auto window = MainWindow::instance();
    if (window) {
        winsize = window->frameGeometry().size();
        center  = window->frameGeometry().center();
    } else {
        nhlog::ui()->warn("unable to retrieve MainWindow's size");
    }

    fileName_.setText(QFileInfo{filePath_}.fileName());

    setAutoFillBackground(true);
    setWindowFlags(Qt::Tool | Qt::WindowStaysOnTopHint);
    setWindowModality(Qt::WindowModal);

    QFont font;
    font.setPointSizeF(font.pointSizeF() * conf::modals::LABEL_MEDIUM_SIZE_RATIO);

    titleLabel_.setFont(font);
    titleLabel_.setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
    titleLabel_.setAlignment(Qt::AlignCenter);
    infoLabel_.setSizePolicy(QSizePolicy::Maximum, QSizePolicy::Maximum);
    fileName_.setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Minimum);
    fileName_.setAlignment(Qt::AlignCenter);
    upload_.setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
    cancel_.setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);

    if (isImage_) {
        infoLabel_.setAlignment(Qt::AlignCenter);

        const auto maxWidth  = winsize.width() * 0.8;
        const auto maxHeight = winsize.height() * 0.8;

        // Scale image preview to fit into the application window.
        infoLabel_.setPixmap(utils::scaleDown(maxWidth, maxHeight, image_));
        move(center.x() - (width() * 0.5), center.y() - (height() * 0.5));
    } else {
        infoLabel_.setAlignment(Qt::AlignLeft);
    }
    infoLabel_.setScaledContents(false);

    show();
}

void
PreviewUploadOverlay::setLabels(const QString &type, const QString &mime, uint64_t upload_size)
{
    if (mediaType_.split('/')[0] == "image") {
        if (!image_.loadFromData(data_)) {
            titleLabel_.setText(QString{tr(ERR_MSG)}.arg(type));
        } else {
            titleLabel_.setText(QString{tr(DEFAULT)}.arg(mediaType_));
        }
        isImage_ = true;
    } else {
        auto const info = QString{tr("Media type: %1\n"
                                     "Media size: %2\n")}
                            .arg(mime)
                            .arg(utils::humanReadableFileSize(upload_size));

        titleLabel_.setText(QString{tr(DEFAULT)}.arg("file"));
        infoLabel_.setText(info);
    }
}

void
PreviewUploadOverlay::setPreview(const QImage &src, const QString &mime)
{
    nhlog::ui()->info(
      "Pasting image with size: {}x{}, format: {}", src.height(), src.width(), mime.toStdString());

    auto const &split = mime.split('/');
    auto const &type  = split[1];

    QBuffer buffer(&data_);
    buffer.open(QIODevice::WriteOnly);
    if (src.save(&buffer, type.toStdString().c_str()))
        titleLabel_.setText(QString{tr(DEFAULT)}.arg("image"));
    else
        titleLabel_.setText(QString{tr(ERR_MSG)}.arg(type));

    mediaType_ = mime;
    filePath_  = "clipboard." + type;
    image_.convertFromImage(src);
    isImage_ = true;

    titleLabel_.setText(QString{tr(DEFAULT)}.arg("image"));
    init();
}

void
PreviewUploadOverlay::setPreview(const QByteArray data, const QString &mime)
{
    nhlog::ui()->info("Pasting {} bytes of data, mimetype {}", data.size(), mime.toStdString());

    auto const &split = mime.split('/');
    auto const &type  = split[1];

    data_      = data;
    mediaType_ = mime;
    filePath_  = "clipboard." + type;
    isImage_   = false;

    if (mime == "image/svg+xml") {
        isImage_ = true;
        image_.loadFromData(data_, mediaType_.toStdString().c_str());
    }

    setLabels(type, mime, data_.size());
    init();
}

void
PreviewUploadOverlay::setPreview(const QString &path)
{
    QFile file{path};

    if (!file.open(QIODevice::ReadOnly)) {
        nhlog::ui()->warn(
          "Failed to open file ({}): {}", path.toStdString(), file.errorString().toStdString());
        close();
        return;
    }

    QMimeDatabase db;
    auto mime = db.mimeTypeForFileNameAndData(path, &file);

    if ((data_ = file.readAll()).isEmpty()) {
        nhlog::ui()->warn("Failed to read media: {}", file.errorString().toStdString());
        close();
        return;
    }

    auto const &split = mime.name().split('/');

    mediaType_ = mime.name();
    filePath_  = file.fileName();
    isImage_   = false;

    setLabels(split[1], mime.name(), data_.size());
    init();
}

void
PreviewUploadOverlay::keyPressEvent(QKeyEvent *event)
{
    if (event->matches(QKeySequence::Cancel)) {
        emit aborted();
        close();
    } else {
        QWidget::keyPressEvent(event);
    }
}