/**
 * \file    src/arch/gtk3/widgets/contentpreviewwidget.c
 * \brief   GTK3 disk/tape/archive preview widget
 *
 * \author  Bas Wassink <b.wassink@ziggo.nl>
 *
 * This file is part of VICE, the Versatile Commodore Emulator.
 * See README for copyright notice.
 *
 *  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 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
 *  02111-1307  USA.
 */


#include "vice.h"

#include <gtk/gtk.h>
#include <stdlib.h>
#include <string.h>

#include "basedialogs.h"
#include "charset.h"
#include "debug_gtk3.h"
#include "imagecontents.h"
#include "lib.h"
#include "log.h"
#include "resources.h"
#include "unicodehelpers.h"
#include "util.h"
#include "widgethelpers.h"

#include "contentpreviewwidget.h"


/** \brief  Function to read image contents
 */
static read_contents_func_type content_func = NULL;


/** \brief  Callback to trigger on the "response" event of the widget
 */
static void (*response_func)(GtkWidget *, gint, gpointer);


/** \brief  Unit number to use in the callback
 */
static int unit_number = 0;


/** \brief  reference to the content view widget
 */
static GtkWidget *content_view = NULL;


/** \brief  Reference to the parent dialog
 */
static GtkWidget *parent_dialog;


/** \brief  Handler for the "row-activated" event of the view
 *
 * This function handles auto-starting a file selected in the preview. It
 * retrieves an integer in the model and uses that to call the Gtk callback
 * handler of the parent dialog.
 *
 * \param[in]   view    tree view
 * \param[in]   path    tree path (unused)
 * \param[in]   column  tree view column (unused)
 * \param[in]   data    extra event data (unused)
 */
static void on_row_activated(
        GtkTreeView *view,
        GtkTreePath *path,
        GtkTreeViewColumn *column,
        gpointer data)
{
    GtkTreeModel *model;
    GtkTreeSelection *selection;
    GtkTreeIter iter;
    int autostart = 0;

    resources_get_int("AutostartOnDoubleClick", &autostart);

    model = gtk_tree_view_get_model(view);
    selection = gtk_tree_view_get_selection(view);

    if (gtk_tree_selection_get_selected(selection, &model, &iter)) {
        int row;

        gtk_tree_model_get(model, &iter, 1, &row, -1);
        if (row < 0) {
            return;
        }
        /* dirty trick: call the "response" event handler with the
         * RESPONSE_AUTOSTART response ID and the unit number passed in as the
         * user_data argument.
         * The index must be retrieved via content_preview_widget_get_index().
         */
        if (parent_dialog != NULL) {
            response_func(parent_dialog,
                          autostart ? VICE_RESPONSE_AUTOSTART_INDEX : VICE_RESPONSE_AUTOLOAD_INDEX,
                          GINT_TO_POINTER(unit_number));
        }
    }
}


/** \brief  Create the model for the view
 *
 * The model created has two columns, a string representing a file:
 * '\<blocks\> "\<filename\>" \<filetype-and-flags\>' and an integer which indicates
 * the file's index in the image's "directory".
 *
 * \param[in]   path    path to image file
 *
 * \return  model (empty if reading the image failed)
 */
static GtkListStore *create_model(const char *path)
{
    GtkListStore *model;
    GtkTreeIter iter;
    image_contents_t *contents;
    image_contents_file_list_t *entry;
    char *tmp;
    char *sep;
    char *utf8;
    int row;
    int blocks;

    model = gtk_list_store_new(2, G_TYPE_STRING, G_TYPE_INT);
    if (path == NULL) {
        return model;
    }
    /* don't try to read from a directory: avoid error messages from
     * vdrive/fsimage */
    if (g_file_test(path, G_FILE_TEST_IS_DIR)) {
        return model;
    }

    if (content_func == NULL) {
        log_error(LOG_DEFAULT, "no content-get function specified, bailing!");
        return model;
    }

    contents = content_func(path);
    if (contents == NULL) {
        gtk_list_store_append(model, &iter);
        gtk_list_store_set(model, &iter,
                0, "<CANNOT READ IMAGE CONTENTS>",
                1, -1,
                -1);
        return model;
    }

    row = -1;   /* -1 means invalid file when double-clicking */

    /* disk name & ID */
    tmp = image_contents_to_string(contents, IMAGE_CONTENTS_STRING_PETSCII);
    /* only the disk name and id itself should be reverse, not the line number and space before that */
    sep = strstr(tmp, "\""); /* find start of disk name */
    if (sep) {
        /* if we found the disk name, produce seperate strings for line number and name/id,
            reverse only name/od and then concat them */
        char *utf8a, *utf8b;
        *sep = 0;
        utf8a = (char *)vice_gtk3_petscii_upper_to_utf8((unsigned char *)tmp, 0);
        *sep = '"';
        utf8b = (char *)vice_gtk3_petscii_upper_to_utf8((unsigned char *)sep, 1);
        utf8 = util_concat(utf8a, utf8b, NULL);
        lib_free(utf8a);
        lib_free(utf8b);
    } else {
        /* if start of disk name was not found use the entire string */
        utf8 = (char *)vice_gtk3_petscii_upper_to_utf8((unsigned char *)tmp, 1);
    }
    gtk_list_store_append(model, &iter);
    gtk_list_store_set(model, &iter, 0, utf8, 1, row, -1);
    row++;
    lib_free(tmp);
    lib_free(utf8);

    /* files, if any */
    for (entry = contents->file_list; entry != NULL; entry = entry->next) {
        tmp = image_contents_file_to_string(entry, IMAGE_CONTENTS_STRING_PETSCII);
        utf8 = (char *)vice_gtk3_petscii_upper_to_utf8((unsigned char *)tmp, false);
        gtk_list_store_append(model, &iter);
        gtk_list_store_set(model, &iter,
                0, utf8,
                1, row,
                -1);
        row++;
        lib_free(tmp);
        lib_free(utf8);
    }

    /* blocks free */
    blocks = contents->blocks_free;
    if (blocks >= 0) {
        tmp = lib_msprintf("%d BLOCKS FREE.", contents->blocks_free);
        utf8 = (char *)vice_gtk3_petscii_upper_to_utf8((unsigned char *)tmp, false);
        gtk_list_store_append(model, &iter);
        gtk_list_store_set(model, &iter,
                0, utf8,
                1, -1,  /* -1 means invalid file again */
                -1);
        lib_free(tmp);
        lib_free(utf8);
    }
    image_contents_destroy(contents);
    return model;
}


/** \brief  Create the view for the content widget
 *
 * Creates a GtkTreeView to display the contents of image \a path
 *
 * \param[in]   path    path to image file
 *
 * \return  GtkTreeView
 */
static GtkWidget *create_view(const char *path)
{
    GtkTreeView *view;
    GtkTreeViewColumn *column;
    GtkListStore *model;
    GtkCellRenderer *renderer;

    model = create_model(path);

    view = GTK_TREE_VIEW(gtk_tree_view_new_with_model(GTK_TREE_MODEL(model)));
    g_object_unref(model);
    renderer = gtk_cell_renderer_text_new();

    /* try to remove all padding between cell rows, this still does not work 100%.
       careful with removing any of the following, some things may have no effect
       in one theme, but on another it does. */
    g_object_set(renderer,
                 /* GtkCellRendererText */
                 "font", "C64 Pro Mono 10",
                 "scale-set", TRUE,
                 "scale", 1.0,
                 /*"attributes", attrlist,*/ /* how does this work? we want to change ypad of the font */
                 /* GtkCellRenderer */
                 "height", 10,
                 "ypad", 0,
                 "yalign", 0.0,
                 NULL);
    /* this takes the size from ypad of the font */
    /* gtk_cell_renderer_text_set_fixed_height_from_font(GTK_CELL_RENDERER_TEXT(renderer), numrows); */
    gtk_cell_renderer_set_padding (renderer, 0, 0);
    gtk_cell_renderer_set_fixed_size(renderer, -1, 10);

    column = gtk_tree_view_column_new_with_attributes(
            /* GtkTreeViewColumn */
            "Contents", renderer,
            "text", 0,
            NULL);
    gtk_tree_view_column_set_spacing (column, 0);

    gtk_tree_view_append_column(view, column);

    gtk_tree_view_set_headers_clickable(view, FALSE);
    gtk_tree_view_set_headers_visible(view, FALSE);
    gtk_tree_selection_set_mode(gtk_tree_view_get_selection(view),
            GTK_SELECTION_SINGLE);

    gtk_widget_set_vexpand(GTK_WIDGET(view), TRUE);

    g_signal_connect(view, "row-activated", G_CALLBACK(on_row_activated), NULL);

    return GTK_WIDGET(view);
}


/*****************************************************************************
 *                          Public functions                                 *
 ****************************************************************************/

/** \brief  Create widget to show image contents in a file dialog
 *
 * The \a func argument sets the function to use to retrieve the contents
 * ('directory') of an image. For disk images this will be
 * diskcontents_filesystem_read(), for tape images ...
 * If this argument is `NULL`, no image contents will be displayed in the
 * widget.
 *
 * \param[in,out]   dialog      parent dialog
 * \param[in]       func        function to use to retrieve image contents
 * \param[in]       response    dialog response callback
 * \param[in]       unit        unit number (1-2 for tape, 8-11 for drive)
 *
 * \return  GtkGrid
 */
GtkWidget *content_preview_widget_create(
        GtkWidget *dialog,
        read_contents_func_type func,
        void (*response)(GtkWidget *, gint, gpointer),
        int unit)
{
    GtkWidget *grid;
    GtkWidget *label;
    GtkWidget *scroll;

    parent_dialog = dialog;
    content_func = func;
    response_func = response;
    unit_number = unit;

    grid = gtk_grid_new();
    gtk_widget_set_hexpand(grid, TRUE);

    label = gtk_label_new(NULL);
    gtk_label_set_markup(GTK_LABEL(label), "<b>Image contents</b>");
    gtk_grid_attach(GTK_GRID(grid), label, 0, 0, 1, 1);

    /* create scrolled window to contain the GktTreeView */
    scroll = gtk_scrolled_window_new(NULL, NULL);
    content_view = create_view(NULL);
    gtk_container_add(GTK_CONTAINER(scroll), content_view);

    /* set scrolled window properties */
    gtk_scrolled_window_set_policy(GTK_SCROLLED_WINDOW(scroll),
            GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC);
    gtk_container_set_focus_vadjustment(GTK_CONTAINER(content_view),
            gtk_scrolled_window_get_vadjustment(GTK_SCROLLED_WINDOW (scroll)));
    gtk_container_set_focus_hadjustment(GTK_CONTAINER(content_view),
            gtk_scrolled_window_get_hadjustment(GTK_SCROLLED_WINDOW (scroll)));
    gtk_widget_set_size_request(scroll, 420, -1);
    gtk_widget_set_vexpand(scroll, TRUE);

    gtk_grid_attach(GTK_GRID(grid), scroll, 0, 1, 1, 1);
    gtk_widget_show_all(grid);
    return grid;
}


/** \brief  Set image file for the widget
 *
 * \param[in,out]   widget  preview widget
 * \param[in]       path    path to image file
 */
void content_preview_widget_set_image(GtkWidget *widget, const char *path)
{
    GtkListStore *model;

    model = create_model(path);
    gtk_tree_view_set_model(GTK_TREE_VIEW(content_view), GTK_TREE_MODEL(model));
    if (model != NULL) {
        g_object_unref(model);
    }
}


/** \brief  Set index in directory
 *
 * \param[in]   widget      widget (unused)
 * \param[in]   index       index in directory
 *
 * \return  bool
 */
gboolean content_preview_widget_set_index(GtkWidget *widget, int index)
{
    GtkTreeModel *model;
    GtkTreePath *path;
    GtkTreeSelection *selection;
    gint row_count;

    /* get model and check index */
    model = gtk_tree_view_get_model(GTK_TREE_VIEW(content_view));
    row_count = gtk_tree_model_iter_n_children(model, NULL);
    /* check for valid index (-1 for "BLOCKS FREE") */
    if (index < 1 || index >= row_count -1) {
        return FALSE;
    }

    /* set new selection */
    selection = gtk_tree_view_get_selection(GTK_TREE_VIEW(content_view));
    path = gtk_tree_path_new_from_indices(index, -1);
    gtk_tree_selection_select_path(selection, path);
    return TRUE;
}

/** \brief  Get index in directory
 *
 * \param[in]   widget      widget (unused)
 *
 * \return  index in directory
 */
int content_preview_widget_get_index(GtkWidget *widget)
{
    GtkTreeModel *model;
    GtkTreeSelection *selection;
    GtkTreeIter iter;
    gint row_count;

    /* get model and check index */
    model = gtk_tree_view_get_model(GTK_TREE_VIEW(content_view));
    row_count = gtk_tree_model_iter_n_children(model, NULL);

    selection = gtk_tree_view_get_selection(GTK_TREE_VIEW(content_view));
    if (gtk_tree_selection_get_selected(selection, &model, &iter)) {
        int row;

        gtk_tree_model_get(model, &iter, 1, &row, -1);
#if 0
        debug_gtk3("index = %d/%d\n", row, row_count);
#endif
        if ((row >= 0) && (row <= row_count)) {
            return row;
        }
    }
    return -1;
}