/*
    This file is part of the KDE libraries
    SPDX-FileCopyrightText: 1999, 2000, 2001 Carsten Pfeiffer <pfeiffer@kde.org>
    SPDX-FileCopyrightText: 2013 Teo Mrnjavac <teo@kde.org>

    SPDX-License-Identifier: LGPL-2.0-only
*/

#pragma once

#include <KEditListWidget>

#include <QFileDialog>
#include <QPushButton>
#include <QUrl>

#include <memory>

class KComboBox;
class KLineEdit;
class KUrlCompletion;

class QEvent;
class QString;

/**
 * @class KUrlRequester kurlrequester.h <KUrlRequester>
 *
 * This class is a widget showing a lineedit and a button, which invokes a
 * filedialog. File name completion is available in the lineedit.
 *
 * The default for the filedialog is to ask for one existing local file, i.e.
 * the default mode is 'KFile::File | KFile::ExistingOnly | KFile::LocalOnly',
 * which you can change by using setMode().
 *
 * The default filter is "*", i.e. show all files, which you can change by
 * using setNameFilters() or setMimeTypeFilters().
 *
 * By default the start directory is the current working directory, or the
 * last directory where a file has been selected previously, you can change
 * this behavior by calling setStartDir().
 *
 * The default window modality for the file dialog is Qt::ApplicationModal
 *
 * \image html kurlrequester.png "KUrlRequester"
 *
 * @short A widget to request a filename/url from the user
 * @author Carsten Pfeiffer <pfeiffer@kde.org>
 */
class KUrlRequester : public QWidget
{
    Q_OBJECT
    Q_PROPERTY(QUrl url READ url WRITE setUrl NOTIFY textChanged USER true)
    /// @since 5.108
    Q_PROPERTY(QStringList nameFilters READ nameFilters WRITE setNameFilters)
    Q_PROPERTY(KFile::Modes mode READ mode WRITE setMode)
    Q_PROPERTY(QFileDialog::AcceptMode acceptMode READ acceptMode WRITE setAcceptMode)
    Q_PROPERTY(QString placeholderText READ placeholderText WRITE setPlaceholderText)
    Q_PROPERTY(QString text READ text WRITE setText NOTIFY textChanged)
    Q_PROPERTY(Qt::WindowModality fileDialogModality READ fileDialogModality WRITE setFileDialogModality)

public:
    /**
     * Constructs a KUrlRequester widget.
     */
    explicit KUrlRequester(QWidget *parent = nullptr);

    /**
     * Constructs a KUrlRequester widget with the initial URL @p url.
     */
    explicit KUrlRequester(const QUrl &url, QWidget *parent = nullptr);

    /**
     * Special constructor, which creates a KUrlRequester widget with a custom
     * edit-widget. The edit-widget can be either a KComboBox or a KLineEdit
     * (or inherited thereof). Note: for geometry management reasons, the
     * edit-widget is reparented to have the KUrlRequester as parent.
     */
    KUrlRequester(QWidget *editWidget, QWidget *parent);
    /**
     * Destructs the KUrlRequester.
     */
    ~KUrlRequester() override;

    /**
     * @returns the current url in the lineedit. May be malformed, if the user
     * entered something weird. For local files, ~user or environment variables
     * are substituted, relative paths will be resolved against startDir()
     */
    QUrl url() const;

    /**
     * @returns the current start dir
     */
    QUrl startDir() const;

    /**
     * @returns the current text in the lineedit or combobox.
     * This does not do the URL expansion that url() does, it's only provided
     * for cases where KUrlRequester is used to enter URL-or-something-else,
     * like KOpenWithDialog where you can type a full command with arguments.
     *
     */
    QString text() const;

    /**
     * Sets the open / save mode of the file dialog.
     *
     * The default is QFileDialog::AcceptOpen.
     *
     * @see QFileDialog::setAcceptMode()
     * @since 5.33
     */
    void setAcceptMode(QFileDialog::AcceptMode m);

    /**
     * Returns the current open / save mode
     * @see QFileDialog::acceptMode()
     * @since 5.33
     */
    QFileDialog::AcceptMode acceptMode() const;

    /**
     * Sets the filters for the file dialog.
     * @see QFileDialog::setNameFilters()
     * @since 5.108
     */
    void setNameFilters(const QStringList &filters);

    /**
     * Sets the filters for the file dialog.
     * @see QFileDialog::setNameFilter()
     * @since 5.108
     */
    void setNameFilter(const QString &filter);

    /**
     * Returns the filters for the file dialog.
     * @see QFileDialog::nameFilters()
     * @since 5.108
     */
    QStringList nameFilters() const;

    /**
     * Sets the MIME type filters for the file dialog.
     * @see QFileDialog::setMimeTypeFilters()
     * @since 5.31
     */
    void setMimeTypeFilters(const QStringList &mimeTypes);
    /**
     * Returns the MIME type filters for the file dialog.
     * @see QFileDialog::mimeTypeFilters()
     * @since 5.31
     */
    QStringList mimeTypeFilters() const;

    /**
     * @returns a pointer to the lineedit, either the default one, or the
     * special one, if you used the special constructor.
     *
     * It is provided so that you can e.g. set an own completion object
     * (e.g. KShellCompletion) into it.
     */
    KLineEdit *lineEdit() const;

    /**
     * @returns a pointer to the combobox, in case you have set one using the
     * special constructor. Returns 0L otherwise.
     */
    KComboBox *comboBox() const;

    /**
     * @returns a pointer to the pushbutton. It is provided so that you can
     * specify an own pixmap or a text, if you really need to.
     */
    QPushButton *button() const;

    /**
     * @returns the KUrlCompletion object used in the lineedit/combobox.
     */
    KUrlCompletion *completionObject() const;

    /**
     * @returns an object, suitable for use with KEditListWidget. It allows you
     * to put this KUrlRequester into a KEditListWidget.
     * Basically, do it like this:
     * \code
     * KUrlRequester *req = new KUrlRequester( someWidget );
     * [...]
     * KEditListWidget *editListWidget = new KEditListWidget( req->customEditor(), someWidget );
     * \endcode
     */
    const KEditListWidget::CustomEditor &customEditor();

    /**
     * @return the message set with setPlaceholderText
     * @since 5.0
     */
    QString placeholderText() const;

    /**
     * This makes the KUrlRequester line edit display a grayed-out hinting text as long as
     * the user didn't enter any text. It is often used as indication about
     * the purpose of the line edit.
     * @since 5.0
     */
    void setPlaceholderText(const QString &msg);

    /**
     * @returns the window modality of the file dialog set with setFileDialogModality
     */
    Qt::WindowModality fileDialogModality() const;

    /**
     * Set the window modality for the file dialog to @p modality
     * Directory selection dialogs are always modal
     *
     * The default is Qt::ApplicationModal.
     *
     */
    void setFileDialogModality(Qt::WindowModality modality);

public Q_SLOTS:
    /**
     * Sets the url in the lineedit to @p url.
     */
    void setUrl(const QUrl &url);

    /**
     * Sets the start dir @p startDir.
     * The start dir is only used when the URL isn't set.
     */
    void setStartDir(const QUrl &startDir);

    /**
     * Sets the current text in the lineedit or combobox.
     * This is used for cases where KUrlRequester is used to
     * enter URL-or-something-else, like KOpenWithDialog where you
     * can type a full command with arguments.
     *
     * @see text
     */
    void setText(const QString &text);

    /**
     * Clears the lineedit/combobox.
     */
    void clear();

Q_SIGNALS:
    // forwards from LineEdit
    /**
     * Emitted when the text in the lineedit changes.
     * The parameter contains the contents of the lineedit.
     */
    void textChanged(const QString &);

    /**
     * Emitted when the text in the lineedit was modified by the user.
     * Unlike textChanged(), this signal is not emitted when the text is changed programmatically, for example, by calling setText().
     * @since 5.21
     */
    void textEdited(const QString &);

    /**
     * Emitted when return or enter was pressed in the lineedit.
     * The parameter contains the contents of the lineedit.
     */
    void returnPressed(const QString &text);

    /**
     * Emitted before the filedialog is going to open. Connect
     * to this signal to "configure" the filedialog, e.g. set the
     * filefilter, the mode, a preview-widget, etc. It's usually
     * not necessary to set a URL for the filedialog, as it will
     * get set properly from the editfield contents.
     *
     * If you use multiple KUrlRequesters, you can connect all of them
     * to the same slot and use the given KUrlRequester pointer to know
     * which one is going to open.
     */
    void openFileDialog(KUrlRequester *);

    /**
     * Emitted when the user changed the URL via the file dialog.
     * The parameter contains the contents of the lineedit.
     */
    void urlSelected(const QUrl &);

protected:
    void changeEvent(QEvent *e) override;
    bool eventFilter(QObject *obj, QEvent *ev) override;

private:
    class KUrlRequesterPrivate;
    std::unique_ptr<KUrlRequesterPrivate> const d;

    Q_DISABLE_COPY(KUrlRequester)
};

class KUrlComboRequester : public KUrlRequester // krazy:exclude=dpointer (For use in Qt Designer)
{
    Q_OBJECT
public:
    /**
     * Constructs a KUrlRequester widget with a combobox.
     */
    explicit KUrlComboRequester(QWidget *parent = nullptr);

private:
    class Private;
    Private *const d;
};
