#ifndef __DATA_BASE_MANAGEMENT_H
#define __DATA_BASE_MANAGEMENT_H

#include <QtCore>
#include <QtSql>
#include <QSqlDatabase>

#include "folder_model.h"

class ComicsInfoExporter : public QThread
{
    Q_OBJECT
public:
    ComicsInfoExporter();
    void exportComicsInfo(QSqlDatabase &source, QSqlDatabase &dest);

private:
    void run() override;
};

class ComicsInfoImporter : public QThread
{
    Q_OBJECT
public:
    ComicsInfoImporter();
    void importComicsInfo(QSqlDatabase &source, QSqlDatabase &dest);

private:
    void run() override;
};

struct DatabaseAccess {
    bool libraryExists;
    bool canRead; // db read
    bool canWrite; // db write
    bool canWriteToFolder; // disk write

    operator QString() const
    {
        if (libraryExists && canRead && canWrite && canWriteToFolder) {
            return "OK";
        } else if (!libraryExists) {
            return "WARNING! Library does not exist on disk";
        } else {
            return QString("WARNING! DB read access: %1, DB write access: %2, can write to disk: %3")
                    .arg(canRead ? "YES" : "NO")
                    .arg(canWrite ? "YES" : "NO")
                    .arg(canWriteToFolder ? "YES" : "NO");
        }
    }
};

class DataBaseManagement : public QObject
{
    Q_OBJECT
private:
    QList<QString> dataBasesList;
    static void bindValue(const QString &name, const QSqlRecord &record, QSqlQuery &query);
    static void bindValuesFromRecord(const QSqlRecord &record, QSqlQuery &query);

    static bool addColumns(const QString &tableName, const QStringList &columnDefs, const QSqlDatabase &db);
    static bool addConstraint(const QString &tableName, const QString &constraint, const QSqlDatabase &db);

public:
    DataBaseManagement();
    // crea una base de datos y todas sus tablas
    static QSqlDatabase createDatabase(QString name, QString path);
    static QSqlDatabase createDatabase(QString dest);
    // carga una base de datos desde la ruta path
    static QSqlDatabase loadDatabase(QString libraryDataPath);
    static QSqlDatabase loadDatabaseFromFile(QString path);
    static bool createTables(QSqlDatabase &database);
    static bool createComicInfoTable(QSqlDatabase &database, QString tableName);
    static bool createV8Tables(QSqlDatabase &database);

    static void exportComicsInfo(QString source, QString dest);
    static bool importComicsInfo(QString source, QString dest);

    static QString checkValidDB(const QString &fullPath); // retorna "" si la DB es inválida ó la versión si es válida.
    static int compareVersions(const QString &v1, const QString v2); // retorna <0 si v1 < v2, 0 si v1 = v2 y >0 si v1 > v2
    static bool updateToCurrentVersion(const QString &libraryPath);

    static DatabaseAccess getDatabaseAccess(const QString &libraryPath);
};

#endif