/*
 * Copyright (C) 2009-2017 Canonical Ltd.
 * Author: Robert Ancell <robert.ancell@canonical.com>,
 *         Eduard Gotwig <g@ox.io>
 *
 * This program 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. See http://www.gnu.org/copyleft/gpl.html the full text of the
 * license.
 */

[GtkTemplate (ui = "/org/gnome/SimpleScan/preferences-dialog.ui")]
private class PreferencesDialog : Gtk.Dialog
{
    private Settings settings;

    private bool setting_devices;
    private bool user_selected_device;

    [GtkChild]
    private Gtk.ComboBox device_combo;
    [GtkChild]
    private Gtk.ComboBox text_dpi_combo;
    [GtkChild]
    private Gtk.ComboBox photo_dpi_combo;
    [GtkChild]
    private Gtk.ComboBox paper_size_combo;
    [GtkChild]
    private Gtk.Scale brightness_scale;
    [GtkChild]
    private Gtk.Scale contrast_scale;
    [GtkChild]
    private Gtk.ListStore device_model;
    [GtkChild]
    private Gtk.RadioButton page_delay_3s_button;
    [GtkChild]
    private Gtk.RadioButton page_delay_5s_button;
    [GtkChild]
    private Gtk.RadioButton page_delay_7s_button;
    [GtkChild]
    private Gtk.RadioButton page_delay_10s_button;
    [GtkChild]
    private Gtk.RadioButton page_delay_15s_button;
    [GtkChild]
    private Gtk.ListStore text_dpi_model;
    [GtkChild]
    private Gtk.ListStore photo_dpi_model;
    [GtkChild]
    private Gtk.RadioButton front_side_button;
    [GtkChild]
    private Gtk.RadioButton back_side_button;
    [GtkChild]
    private Gtk.RadioButton both_side_button;
    [GtkChild]
    private Gtk.ListStore paper_size_model;
    [GtkChild]
    private Gtk.Adjustment brightness_adjustment;
    [GtkChild]
    private Gtk.Adjustment contrast_adjustment;
    [GtkChild]
    private Gtk.Button preferences_close_button;

    public PreferencesDialog (Settings settings, bool use_header_bar)
    {
        Object (use_header_bar: use_header_bar ? 1 : -1);

        if (use_header_bar)
            preferences_close_button.visible = false;

        this.settings = settings;

        Gtk.TreeIter iter;
        paper_size_model.append (out iter);
        paper_size_model.set (iter, 0, 0, 1, 0, 2,
                              /* Combo box value for automatic paper size */
                              _("Automatic"), -1);
        paper_size_model.append (out iter);
        paper_size_model.set (iter, 0, 1050, 1, 1480, 2, "A6", -1);
        paper_size_model.append (out iter);
        paper_size_model.set (iter, 0, 1480, 1, 2100, 2, "A5", -1);
        paper_size_model.append (out iter);
        paper_size_model.set (iter, 0, 2100, 1, 2970, 2, "A4", -1);
        paper_size_model.append (out iter);
        paper_size_model.set (iter, 0, 2159, 1, 2794, 2, "Letter", -1);
        paper_size_model.append (out iter);
        paper_size_model.set (iter, 0, 2159, 1, 3556, 2, "Legal", -1);
        paper_size_model.append (out iter);
        paper_size_model.set (iter, 0, 1016, 1, 1524, 2, "4×6", -1);

        var renderer = new Gtk.CellRendererText ();
        device_combo.pack_start (renderer, true);
        device_combo.add_attribute (renderer, "text", 1);

        var dpi = settings.get_int ("text-dpi");
        if (dpi <= 0)
            dpi = DEFAULT_TEXT_DPI;
        set_dpi_combo (text_dpi_combo, DEFAULT_TEXT_DPI, dpi);
        text_dpi_combo.changed.connect (() => { settings.set_int ("text-dpi", get_text_dpi ()); });
        dpi = settings.get_int ("photo-dpi");
        if (dpi <= 0)
            dpi = DEFAULT_PHOTO_DPI;
        set_dpi_combo (photo_dpi_combo, DEFAULT_PHOTO_DPI, dpi);
        photo_dpi_combo.changed.connect (() => { settings.set_int ("photo-dpi", get_photo_dpi ()); });

        set_page_side ((ScanType) settings.get_enum ("page-side"));
        front_side_button.toggled.connect ((button) => { if (button.active) settings.set_enum ("page-side", ScanType.ADF_FRONT); });
        back_side_button.toggled.connect ((button) => { if (button.active) settings.set_enum ("page-side", ScanType.ADF_BACK); });
        both_side_button.toggled.connect ((button) => { if (button.active) settings.set_enum ("page-side", ScanType.ADF_BOTH); });

        renderer = new Gtk.CellRendererText ();
        paper_size_combo.pack_start (renderer, true);
        paper_size_combo.add_attribute (renderer, "text", 2);

        var lower = brightness_adjustment.lower;
        var darker_label = "<small>%s</small>".printf (_("Darker"));
        var upper = brightness_adjustment.upper;
        var lighter_label = "<small>%s</small>".printf (_("Lighter"));
        brightness_scale.add_mark (lower, Gtk.PositionType.BOTTOM, darker_label);
        brightness_scale.add_mark (0, Gtk.PositionType.BOTTOM, null);
        brightness_scale.add_mark (upper, Gtk.PositionType.BOTTOM, lighter_label);
        brightness_adjustment.value = settings.get_int ("brightness");
        brightness_adjustment.value_changed.connect (() => { settings.set_int ("brightness", get_brightness ()); });

        lower = contrast_adjustment.lower;
        var less_label = "<small>%s</small>".printf (_("Less"));
        upper = contrast_adjustment.upper;
        var more_label = "<small>%s</small>".printf (_("More"));
        contrast_scale.add_mark (lower, Gtk.PositionType.BOTTOM, less_label);
        contrast_scale.add_mark (0, Gtk.PositionType.BOTTOM, null);
        contrast_scale.add_mark (upper, Gtk.PositionType.BOTTOM, more_label);
        contrast_adjustment.value = settings.get_int ("contrast");
        contrast_adjustment.value_changed.connect (() => { settings.set_int ("contrast", get_contrast ()); });

        var paper_width = settings.get_int ("paper-width");
        var paper_height = settings.get_int ("paper-height");
        set_paper_size (paper_width, paper_height);
        paper_size_combo.changed.connect (() =>
        {
            int w, h;
            get_paper_size (out w, out h);
            settings.set_int ("paper-width", w);
            settings.set_int ("paper-height", h);
        });

        set_page_delay (settings.get_int ("page-delay"));
        page_delay_3s_button.toggled.connect ((button) => { if (button.active) settings.set_int ("page-delay", 3000); });
        page_delay_5s_button.toggled.connect ((button) => { if (button.active) settings.set_int ("page-delay", 5000); });
        page_delay_7s_button.toggled.connect ((button) => { if (button.active) settings.set_int ("page-delay", 7000); });
        page_delay_10s_button.toggled.connect ((button) => { if (button.active) settings.set_int ("page-delay", 10000); });
        page_delay_15s_button.toggled.connect ((button) => { if (button.active) settings.set_int ("page-delay", 15000); });
    }

    public void set_scan_devices (List<ScanDevice> devices)
    {
        setting_devices = true;

        /* If the user hasn't chosen a scanner choose the best available one */
        var have_selection = false;
        if (user_selected_device)
            have_selection = device_combo.active >= 0;

        /* Add new devices */
        int index = 0;
        Gtk.TreeIter iter;
        foreach (var device in devices)
        {
            int n_delete = -1;

            /* Find if already exists */
            if (device_model.iter_nth_child (out iter, null, index))
            {
                int i = 0;
                do
                {
                    string name;
                    bool matched;

                    device_model.get (iter, 0, out name, -1);
                    matched = name == device.name;

                    if (matched)
                    {
                        n_delete = i;
                        break;
                    }
                    i++;
                } while (device_model.iter_next (ref iter));
            }

            /* If exists, remove elements up to this one */
            if (n_delete >= 0)
            {
                int i;

                /* Update label */
                device_model.set (iter, 1, device.label, -1);

                for (i = 0; i < n_delete; i++)
                {
                    device_model.iter_nth_child (out iter, null, index);
#if VALA_0_36
                    device_model.remove (ref iter);
#else
                    device_model.remove (iter);
#endif
                }
            }
            else
            {
                device_model.insert (out iter, index);
                device_model.set (iter, 0, device.name, 1, device.label, -1);
            }
            index++;
        }

        /* Remove any remaining devices */
        while (device_model.iter_nth_child (out iter, null, index))
#if VALA_0_36
            device_model.remove (ref iter);
#else
            device_model.remove (iter);
#endif

        /* Select the previously selected device or the first available device */
        if (!have_selection)
        {
            var device = settings.get_string ("selected-device");
            if (device != null && find_scan_device (device, out iter))
                device_combo.set_active_iter (iter);
            else
                device_combo.set_active (0);
        }

        setting_devices = false;
    }

    public string? get_selected_device ()
    {
        Gtk.TreeIter iter;

        if (device_combo.get_active_iter (out iter))
        {
            string device;
            device_model.get (iter, 0, out device, -1);
            return device;
        }

        return null;
    }

    public string? get_selected_device_label ()
    {
        Gtk.TreeIter iter;

        if (device_combo.get_active_iter (out iter))
        {
            string label;
            device_model.get (iter, 1, out label, -1);
            return label;
        }

        return null;
    }

    public void set_selected_device (string device)
    {
        user_selected_device = true;

        Gtk.TreeIter iter;
        if (!find_scan_device (device, out iter))
            return;

        device_combo.set_active_iter (iter);
    }

    private bool find_scan_device (string device, out Gtk.TreeIter iter)
    {
        bool have_iter = false;

        if (device_model.get_iter_first (out iter))
        {
            do
            {
                string d;
                device_model.get (iter, 0, out d, -1);
                if (d == device)
                    have_iter = true;
            } while (!have_iter && device_model.iter_next (ref iter));
        }

        return have_iter;
    }

    private void set_page_side (ScanType page_side)
    {
        switch (page_side)
        {
        case ScanType.ADF_FRONT:
            front_side_button.active = true;
            break;
        case ScanType.ADF_BACK:
            back_side_button.active = true;
            break;
        default:
        case ScanType.ADF_BOTH:
            both_side_button.active = true;
            break;
        }
    }

    public ScanType get_page_side ()
    {
        if (front_side_button.active)
            return ScanType.ADF_FRONT;
        else if (back_side_button.active)
            return ScanType.ADF_BACK;
        else
            return ScanType.ADF_BOTH;
    }

    public void set_paper_size (int width, int height)
    {
        Gtk.TreeIter iter;
        bool have_iter;

        for (have_iter = paper_size_model.get_iter_first (out iter);
             have_iter;
             have_iter = paper_size_model.iter_next (ref iter))
        {
            int w, h;
            paper_size_model.get (iter, 0, out w, 1, out h, -1);
            if (w == width && h == height)
               break;
        }

        if (!have_iter)
            have_iter = paper_size_model.get_iter_first (out iter);
        if (have_iter)
            paper_size_combo.set_active_iter (iter);
    }

    public int get_text_dpi ()
    {
        Gtk.TreeIter iter;
        int dpi = DEFAULT_TEXT_DPI;

        if (text_dpi_combo.get_active_iter (out iter))
            text_dpi_model.get (iter, 0, out dpi, -1);

        return dpi;
    }

    public int get_photo_dpi ()
    {
        Gtk.TreeIter iter;
        int dpi = DEFAULT_PHOTO_DPI;

        if (photo_dpi_combo.get_active_iter (out iter))
            photo_dpi_model.get (iter, 0, out dpi, -1);

        return dpi;
    }

    public bool get_paper_size (out int width, out int height)
    {
        Gtk.TreeIter iter;

        width = height = 0;
        if (paper_size_combo.get_active_iter (out iter))
        {
            paper_size_model.get (iter, 0, ref width, 1, ref height, -1);
            return true;
        }

        return false;
    }

    public int get_brightness ()
    {
        return (int) brightness_adjustment.value;
    }

    public void set_brightness (int brightness)
    {
        brightness_adjustment.value = brightness;
    }

    public int get_contrast ()
    {
        return (int) contrast_adjustment.value;
    }

    public void set_contrast (int contrast)
    {
        contrast_adjustment.value = contrast;
    }

    public int get_page_delay ()
    {
        if (page_delay_15s_button.active)
            return 15000;
        else if (page_delay_10s_button.active)
            return 10000;
        else if (page_delay_7s_button.active)
            return 7000;
        else if (page_delay_5s_button.active)
            return 5000;
        else
            return 3000;
    }

    public void set_page_delay (int page_delay)
    {
        if (page_delay >= 15000)
            page_delay_15s_button.active = true;
        else if (page_delay >= 1000)
            page_delay_10s_button.active = true;
        else if (page_delay >= 7000)
            page_delay_7s_button.active = true;
        else if (page_delay >= 5000)
            page_delay_5s_button.active = true;
        else
            page_delay_3s_button.active = true;
    }

    private void set_dpi_combo (Gtk.ComboBox combo, int default_dpi, int current_dpi)
    {
        var renderer = new Gtk.CellRendererText ();
        combo.pack_start (renderer, true);
        combo.add_attribute (renderer, "text", 1);

        var model = combo.model as Gtk.ListStore;
        int[] scan_resolutions = {75, 150, 300, 600, 1200, 2400};
        foreach (var dpi in scan_resolutions)
        {
            string label;
            if (dpi == default_dpi)
                /* Preferences dialog: Label for default resolution in resolution list */
                label = _("%d dpi (default)").printf (dpi);
            else if (dpi == 75)
                /* Preferences dialog: Label for minimum resolution in resolution list */
                label = _("%d dpi (draft)").printf (dpi);
            else if (dpi == 1200)
                /* Preferences dialog: Label for maximum resolution in resolution list */
                label = _("%d dpi (high resolution)").printf (dpi);
            else
                /* Preferences dialog: Label for resolution value in resolution list (dpi = dots per inch) */
                label = _("%d dpi").printf (dpi);

            Gtk.TreeIter iter;
            model.append (out iter);
            model.set (iter, 0, dpi, 1, label, -1);

            if (dpi == current_dpi)
                combo.set_active_iter (iter);
        }
    }

    [GtkCallback]
    private void device_combo_changed_cb (Gtk.Widget widget)
    {
        if (setting_devices)
            return;
        user_selected_device = true;
        if (get_selected_device () != null)
            settings.set_string ("selected-device", get_selected_device ());
    }
}

private class PageIcon : Gtk.DrawingArea
{
    private string text;
    private double r;
    private double g;
    private double b;
    private const int MINIMUM_WIDTH = 20;

    public PageIcon (string text, double r = 1.0, double g = 1.0, double b = 1.0)
    {
        this.text = text;
        this.r = r;
        this.g = g;
        this.b = b;
    }

    public override void get_preferred_width (out int minimum_width, out int natural_width)
    {
        minimum_width = natural_width = MINIMUM_WIDTH;
    }

    public override void get_preferred_height (out int minimum_height, out int natural_height)
    {
        minimum_height = natural_height = (int) Math.round (MINIMUM_WIDTH * Math.SQRT2);
    }

    public override void get_preferred_height_for_width (int width, out int minimum_height, out int natural_height)
    {
        minimum_height = natural_height = (int) (width * Math.SQRT2);
    }

    public override void get_preferred_width_for_height (int height, out int minimum_width, out int natural_width)
    {
        minimum_width = natural_width = (int) (height / Math.SQRT2);
    }

    public override bool draw (Cairo.Context c)
    {
        var w = get_allocated_width ();
        var h = get_allocated_height ();
        if (w * Math.SQRT2 > h)
            w = (int) Math.round (h / Math.SQRT2);
        else
            h = (int) Math.round (w * Math.SQRT2);

        c.translate ((get_allocated_width () - w) / 2, (get_allocated_height () - h) / 2);

        c.rectangle (0.5, 0.5, w - 1, h - 1);

        c.set_source_rgb (r, g, b);
        c.fill_preserve ();

        c.set_line_width (1.0);
        c.set_source_rgb (0.0, 0.0, 0.0);
        c.stroke ();

        Cairo.TextExtents extents;
        c.text_extents (text, out extents);
        c.translate ((w - extents.width) * 0.5 - 0.5, (h + extents.height) * 0.5 - 0.5);
        c.show_text (text);

        return true;
    }
}