#ifndef DOWNLOADER_H
#define DOWNLOADER_H
/**
 * @file downloader.h
 * @brief High level API to download necessary data.
 *
 */

#include <QThread>
#include <QString>
#include <QByteArray>

class Downloader: public QThread
{
    Q_OBJECT

public:
    /**
     * @brief Construct a downloader to download data from url
     *
     * Takes the builtin certificate for https verification.
     *
     * @param[in] parent the parent object.
     * @param[in] url the Url to download data from.
     */
    Downloader(QObject* parent, const QString& url);

    /**
     * @brief Construct a downloader with a specific certificate
     *
     * @param[in] parent the parent object.
     * @param[in] url the Url to download data from
     * @param[in] certificate to accept https connection from
     */
    Downloader(QObject* parent, const QString& url,
               const QByteArray& certificate);

    enum Status {
        NewSoftwareAvailable, // A Software Update has been downloaded
        NewListAvailable, // A certificate list has been downloaded
        UpToDate, // Nothing changed
        Error // An error happened
    };

    enum ErrorCode {
        NoConnection,
        InvalidCertificate,
        ConnectionLost,
        Timeout,
        Unknown
    };

    /**
     * @brief Construct a downloader with a specific certificate
     *
     * @param[in] url the Url to download data from
     * @param[in] certificate to accept https connection from
     */
    QString getDownloadedFileName();

protected:
    void run();

private:
    QString mUrl;
    QByteArray mCert;

Q_SIGNALS:
    /**
     * @brief Some progress has been made.
     *
     * @param[out] message: A message to show. Can be empty.
     * @param[out] current: Value of current progress.
     * @param[out] total: Total value of possible progress
     */
    void progress(const QString &message, int current, int total);

    /**
     * @brief An error happened
     *
     * @param[out] message: A message to show. Can be empty.
     * @param[out] errorCode: ErrorCode of this error.
     * @param[out] total: Total value of possible progress.
     */
    void error(const QString &message, ErrorCode error);
};
#endif