#ifndef WALLETMANAGER_H
#define WALLETMANAGER_H

#include <QObject>
#include <QUrl>
#include <wallet/wallet2_api.h>
#include <QMutex>
#include <QPointer>

class Wallet;
namespace Monero {
    class WalletManager;
}

class WalletManager : public QObject
{
    Q_OBJECT
    Q_PROPERTY(bool connected READ connected)

public:
    enum LogLevel {
        LogLevel_Silent = Monero::WalletManagerFactory::LogLevel_Silent,
        LogLevel_0 = Monero::WalletManagerFactory::LogLevel_0,
        LogLevel_1 = Monero::WalletManagerFactory::LogLevel_1,
        LogLevel_2 = Monero::WalletManagerFactory::LogLevel_2,
        LogLevel_3 = Monero::WalletManagerFactory::LogLevel_3,
        LogLevel_4 = Monero::WalletManagerFactory::LogLevel_4,
        LogLevel_Min = Monero::WalletManagerFactory::LogLevel_Min,
        LogLevel_Max = Monero::WalletManagerFactory::LogLevel_Max,
    };

    static WalletManager * instance();
    // wizard: createWallet path;
    Q_INVOKABLE Wallet * createWallet(const QString &path, const QString &password,
                                      const QString &language, bool testnet = false);

    /*!
     * \brief openWallet - opens wallet by given path
     * \param path       - wallet filename
     * \param password   - wallet password. Empty string in wallet isn't password protected
     * \param testnet    - determines if we running testnet
     * \return wallet object pointer
     */
    Q_INVOKABLE Wallet * openWallet(const QString &path, const QString &password, bool testnet = false);

    /*!
     * \brief openWalletAsync - asynchronous version of "openWallet". Returns immediately. "walletOpened" signal
     *                          emitted when wallet opened;
     */
    Q_INVOKABLE void openWalletAsync(const QString &path, const QString &password, bool testnet = false);

    // wizard: recoveryWallet path; hint: internally it recorvers wallet and set password = ""
    Q_INVOKABLE Wallet * recoveryWallet(const QString &path, const QString &memo,
                                       bool testnet = false, quint64 restoreHeight = 0);

    /*!
     * \brief closeWallet - closes current open wallet and frees memory
     * \return wallet address
     */
    Q_INVOKABLE QString closeWallet();

    /*!
     * \brief closeWalletAsync - asynchronous version of "closeWallet"
     */
    Q_INVOKABLE void closeWalletAsync();

    //! checks is given filename is a wallet;
    Q_INVOKABLE bool walletExists(const QString &path) const;

    //! returns list with wallet's filenames, if found by given path
    Q_INVOKABLE QStringList findWallets(const QString &path);

    //! returns error description in human language
    Q_INVOKABLE QString errorString() const;


    // wizard: both "create" and "recovery" paths.
    // TODO: probably move it to "Wallet" interface
    Q_INVOKABLE bool moveWallet(const QString &src, const QString &dst);
    //! returns libwallet language name for given locale
    Q_INVOKABLE QString walletLanguage(const QString &locale);


    //! since we can't call static method from QML, move it to this class
    Q_INVOKABLE QString displayAmount(quint64 amount) const;
    Q_INVOKABLE quint64 amountFromString(const QString &amount) const;
    Q_INVOKABLE quint64 amountFromDouble(double amount) const;
    Q_INVOKABLE quint64 maximumAllowedAmount() const;

    // QML JS engine doesn't support unsigned integers
    Q_INVOKABLE QString maximumAllowedAmountAsSting() const;

    Q_INVOKABLE bool paymentIdValid(const QString &payment_id) const;
    Q_INVOKABLE bool addressValid(const QString &address, bool testnet) const;
    Q_INVOKABLE QString paymentIdFromAddress(const QString &address, bool testnet) const;

    Q_INVOKABLE QString checkPayment(const QString &address, const QString &txid, const QString &txkey, const QString &daemon_address) const;

    Q_INVOKABLE void setDaemonAddress(const QString &address);
    Q_INVOKABLE bool connected() const;
    Q_INVOKABLE quint64 networkDifficulty() const;
    Q_INVOKABLE quint64 blockchainHeight() const;
    Q_INVOKABLE quint64 blockchainTargetHeight() const;
    Q_INVOKABLE double miningHashRate() const;

    // QML missing such functionality, implementing these helpers here
    Q_INVOKABLE QString urlToLocalPath(const QUrl &url) const;
    Q_INVOKABLE QUrl localPathToUrl(const QString &path) const;

    Q_INVOKABLE void setLogLevel(int logLevel);

    Q_INVOKABLE quint64 add(quint64 x, quint64 y) const { return x + y; }
    Q_INVOKABLE quint64 sub(quint64 x, quint64 y) const { return x - y; }
    Q_INVOKABLE qint64 addi(qint64 x, qint64 y) const { return x + y; }
    Q_INVOKABLE qint64 subi(qint64 x, qint64 y) const { return x - y; }

    Q_INVOKABLE double getPasswordStrength(const QString &password) const;

    Q_INVOKABLE QString resolveOpenAlias(const QString &address) const;
    Q_INVOKABLE bool parse_uri(const QString &uri, QString &address, QString &payment_id, uint64_t &amount, QString &tx_description, QString &recipient_name, QVector<QString> &unknown_parameters, QString &error);

signals:

    void walletOpened(Wallet * wallet);
    void walletClosed(const QString &walletAddress);

public slots:
private:

    explicit WalletManager(QObject *parent = 0);
    static WalletManager * m_instance;
    Monero::WalletManager * m_pimpl;
    QMutex m_mutex;
    QPointer<Wallet> m_currentWallet;

};

#endif // WALLETMANAGER_H