// Copyright 2017 Alejandro Sirgo Rica
//
// This file is part of Flameshot.
//
//     Flameshot is free software: you can redistribute it and/or modify
//     it under the terms of the GNU General Public License as published by
//     the Free Software Foundation, either version 3 of the License, or
//     (at your option) any later version.
//
//     Flameshot is distributed in the hope that it will be useful,
//     but WITHOUT ANY WARRANTY; without even the implied warranty of
//     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//     GNU General Public License for more details.
//
//     You should have received a copy of the GNU General Public License
//     along with Flameshot.  If not, see <http://www.gnu.org/licenses/>.

#include "screenshot.h"
#include "capturemodification.h"
#include "button.h"
#include <QStandardPaths>
#include <QIcon>
#include <QSettings>
#include <QObject>
#include <QString>
#include <QMessageBox>
#include <QImageWriter>
#include <QFileDialog>
#include <QPainter>
#include <QBuffer>
#include <QUrlQuery>
#include <QNetworkRequest>
#include <QNetworkAccessManager>

// Screenshot is an extension of QPixmap which lets you manage specific tasks

Screenshot::Screenshot(const QPixmap &p) : m_screenshot(p) {

}

Screenshot::~Screenshot() {
    if (m_accessManager) delete(m_accessManager);
}

void Screenshot::setScreenshot(const QPixmap &p) {
    m_screenshot = p;
}

QPixmap Screenshot::getScreenshot() const {
    return m_screenshot;
}

QString Screenshot::graphicalSave(const QRect &selection) const {
    const QString format = "png";

    QSettings settings;
    QString savePath = settings.value("savePath").toString();
    if (savePath.isEmpty() || !QDir(savePath).exists()) {
        savePath = QStandardPaths::writableLocation(QStandardPaths::PicturesLocation);
        if (savePath.isEmpty()) {
            savePath = QDir::currentPath();
        }
    }
    // find unused name adding _n where n is a number
    QString tempName = QObject::tr("/screenshot");
    QFileInfo checkFile(savePath + tempName + "." + format);
    if (checkFile.exists()) {
        tempName += "_";
        int i = 1;
        while (true) {
            checkFile.setFile(
                        savePath + tempName + QString::number(i) + "." + format);
            if (!checkFile.exists()) {
                tempName += QString::number(i);
                break;
            }
            ++i;
        }
    }
    savePath += tempName + "." + format;

    QFileDialog fileDialog(nullptr, QObject::tr("Save As"), savePath);
    fileDialog.setAcceptMode(QFileDialog::AcceptSave);
    fileDialog.setFileMode(QFileDialog::AnyFile);
    fileDialog.setDirectory(savePath);
    QStringList mimeTypes;
    for (const QByteArray &bf: QImageWriter::supportedMimeTypes())
        mimeTypes.append(QLatin1String(bf));
    fileDialog.setMimeTypeFilters(mimeTypes);
    fileDialog.selectMimeTypeFilter("image/" + format);
    fileDialog.setDefaultSuffix(format);
    fileDialog.setWindowIcon(QIcon(":img/flameshot.svg"));
    if (fileDialog.exec() != QDialog::Accepted) { return ""; }
    const QString fileName = fileDialog.selectedFiles().first();

    const QString pathNoFile = fileName.left(fileName.lastIndexOf("/"));
    settings.setValue("savePath", pathNoFile);

    QPixmap pixToSave;
    if (selection.isEmpty()) {
        pixToSave = m_screenshot;
    } else { // save full screen when no selection
        pixToSave = m_screenshot.copy(selection);
    }

//    if (settings.value("mouseVisible").toBool()) {
//        // TO DO
//    }

    if (!pixToSave.save(fileName)) {
        QMessageBox::warning(nullptr, QObject::tr("Save Error"),
                             QObject::tr("The image could not be saved to \"%1\".")
                             .arg(QDir::toNativeSeparators(fileName)));
    }
    return fileName;
}

QPixmap Screenshot::paintModifications(const QVector<CaptureModification> v) {
    QPainter painter(&m_screenshot);
    painter.setRenderHint(QPainter::Antialiasing);
    for (CaptureModification modification: v) {
        painter.setPen(QPen(modification.getColor(), 2));
        QVector<QPoint> points = modification.getPoints();
        switch (modification.getType()) {
        case Button::Type::arrow:
            painter.drawLine(points[0], points[1]);
            // TODO

            break;
        case Button::Type::circle:
            painter.drawEllipse(QRect(points[0], points[1]));
            break;
        case Button::Type::line:
            painter.drawLine(points[0], points[1]);
            break;
        case Button::Type::marker:
            painter.setOpacity(0.5);
            painter.setPen(QPen(modification.getColor(), 14));
            painter.drawLine(points[0], points[1]);
            painter.setOpacity(1);
            break;
        case Button::Type::pencil:
            painter.drawPolyline(points.data(), points.size());
            break;
        case Button::Type::rectangle:
            painter.drawRect(QRect(points[0], points[1]));
            break;
        default:
            break;
        }
    }
    return m_screenshot;
}

void Screenshot::uploadToImgur(QNetworkAccessManager *accessManager,
                               const QRect &selection) {
    QString title ="asdasdf";
    QString description = "test";
    QPixmap pixToSave;
    if (selection.isEmpty()) {
        pixToSave = m_screenshot;
    } else { // save full screen when no selection
        pixToSave = m_screenshot.copy(selection);
    }
    QByteArray byteArray;
    QBuffer buffer(&byteArray);
    pixToSave.save(&buffer, "PNG");

    QUrlQuery urlQuery;
    urlQuery.addQueryItem("title", title);
    urlQuery.addQueryItem("description", description);

    QNetworkRequest request;
    QUrl url("https://api.imgur.com/3/image");
    url.setQuery(urlQuery);
    request.setUrl(url);
    request.setHeader(QNetworkRequest::ContentTypeHeader,
                      "application/application/x-www-form-urlencoded");
    request.setRawHeader("Authorization", "Client-ID 313baf0c7b4d3ff");

    accessManager->post(request, byteArray);
}