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#include "walls_model.h"

static void walls_model_init(WallsModel *walls_model);
static void walls_model_class_init(WallsModelClass *klass);
static void walls_model_tree_model_init(GtkTreeModelIface *iface);
static void walls_model_finalize(GObject *object);
static GtkTreeModelFlags walls_model_get_flags(GtkTreeModel *tree_model);
static gint walls_model_get_n_columns(GtkTreeModel *tree_model);
static GType walls_model_get_column_type(GtkTreeModel *tree_model, gint index);
static gboolean walls_model_get_iter(GtkTreeModel *tree_model, GtkTreeIter *iter, GtkTreePath *path);
static GtkTreePath *walls_model_get_path(GtkTreeModel *tree_model, GtkTreeIter *iter);
static void walls_model_get_value(GtkTreeModel *tree_model, GtkTreeIter *iter, gint column, GValue *value);
static gboolean walls_model_iter_next(GtkTreeModel *tree_model, GtkTreeIter *iter);
static gboolean walls_model_iter_children(GtkTreeModel *tree_model, GtkTreeIter *iter, GtkTreeIter *parent);
static gboolean walls_model_iter_has_child(GtkTreeModel *tree_model, GtkTreeIter *iter);
static gint walls_model_iter_n_children(GtkTreeModel *tree_model, GtkTreeIter *iter);
static gboolean walls_model_iter_nth_child(GtkTreeModel *tree_model, GtkTreeIter *iter, GtkTreeIter *parent, gint n);
static gboolean walls_model_iter_parent(GtkTreeModel *tree_model, GtkTreeIter *iter, GtkTreeIter *child);

static GObjectClass *parent_class = NULL;

GType walls_model_get_type() {
	static GType walls_model_type = 0;
	if(walls_model_type == 0) {
		static const GTypeInfo walls_model_info = {
			sizeof(WallsModelClass),
			NULL,
			NULL,
			(GClassInitFunc) walls_model_class_init,
			NULL,
			NULL,
			sizeof(WallsModel),
			0,
			(GInstanceInitFunc) walls_model_init
		};
		static const GInterfaceInfo tree_model_info = {
			(GInterfaceInitFunc) walls_model_tree_model_init,
			NULL,
			NULL
		};
		walls_model_type = g_type_register_static(G_TYPE_OBJECT, "WallsModel", &walls_model_info, (GTypeFlags)0);
		g_type_add_interface_static(walls_model_type, GTK_TYPE_TREE_MODEL, &tree_model_info);
	}
	return walls_model_type;
}

static void walls_model_class_init(WallsModelClass *klass) {
	GObjectClass *object_class;

	parent_class = (GObjectClass*)g_type_class_peek_parent(klass);
	object_class = (GObjectClass*)klass;

	object_class->finalize = walls_model_finalize;
}

static void walls_model_tree_model_init(GtkTreeModelIface *iface) {
	iface->get_flags = walls_model_get_flags;
	iface->get_n_columns = walls_model_get_n_columns;
	iface->get_column_type = walls_model_get_column_type;
	iface->get_iter = walls_model_get_iter;
	iface->get_path = walls_model_get_path;
	iface->get_value = walls_model_get_value;
	iface->iter_next = walls_model_iter_next;
	iface->iter_children = walls_model_iter_children;
	iface->iter_has_child = walls_model_iter_has_child;
	iface->iter_n_children = walls_model_iter_n_children;
	iface->iter_nth_child = walls_model_iter_nth_child;
	iface->iter_parent = walls_model_iter_parent;
}

static void walls_model_init(WallsModel *walls_model) {
	WallsModelRecord temp;
	GArray *array;
	walls_model->n_columns = WALLS_MODEL_N_COLUMNS;

	walls_model->column_types[0] = G_TYPE_STRING;
	walls_model->column_types[1] = G_TYPE_UINT64;
	walls_model->column_types[2] = G_TYPE_INT;
	walls_model->column_types[3] = G_TYPE_INT;
	walls_model->column_types[4] = G_TYPE_INT;

	g_assert(WALLS_MODEL_N_COLUMNS == 5);

	walls_model->num_rows = 0;
	walls_model->rows = g_array_new(TRUE, FALSE, sizeof(WallsModelRecord));
	walls_model->stamp = g_random_int();

	if(db_get_top_level_directories(&array)) {
		for(int i = 0; i < array->len; i++) {
			struct directory_t *dir;

			dir = &g_array_index(array, struct directory_t, i);

			temp.type = WALLS_MODEL_TYPE_DIR;
			temp.dir.name = g_strdup(dir->name);
			temp.dir.dirid = dir->dirid;
			temp.parent = NULL;
			temp.children = NULL;
			temp.pos = i;

			g_free(dir->name);

			g_array_append_val(walls_model->rows, temp);
			walls_model->num_rows++;
		}
		g_array_free(array, TRUE);
	}
}

static void walls_model_finalize(GObject *object) {
	printf("walls_model_finalize\n");
	WallsModel *walls_model;

	g_assert(MODEL_IS_WALLS(object));

	walls_model = WALLS_MODEL(object);

	for(int i = 0; i < walls_model->rows->len; i++) {
		WallsModelRecord *temp;
		temp = &g_array_index(walls_model->rows, WallsModelRecord, i);
		g_free(temp->dir.name);
	}

	g_array_free(walls_model->rows, TRUE);
}

static GtkTreeModelFlags walls_model_get_flags(GtkTreeModel *tree_model) {
	g_return_val_if_fail(MODEL_IS_WALLS(tree_model), (GtkTreeModelFlags)0);

	return GTK_TREE_MODEL_ITERS_PERSIST;
}

static gint walls_model_get_n_columns(GtkTreeModel *tree_model) {
	g_return_val_if_fail(MODEL_IS_WALLS(tree_model), 0);

	return WALLS_MODEL(tree_model)->n_columns;
}

static GType walls_model_get_column_type(GtkTreeModel *tree_model, gint index) {
	g_return_val_if_fail(MODEL_IS_WALLS(tree_model), G_TYPE_INVALID);
	g_return_val_if_fail(index < WALLS_MODEL(tree_model)->n_columns && index >= 0, G_TYPE_INVALID);

	return WALLS_MODEL(tree_model)->column_types[index];
}

inline static void fill_dir(WallsModelRecord *record) {
	GArray *array;
	gint dircount = 0;

	record->children = g_array_new(FALSE, FALSE, sizeof(WallsModelRecord));
	if(db_get_directories(record->dir.dirid, &array)) {
		for(int i = 0; i < array->len; i++) {
			WallsModelRecord temp;
			struct directory_t *dir;

			dir = &g_array_index(array, struct directory_t, i);
			temp.type = WALLS_MODEL_TYPE_DIR;
			temp.dir.name = g_path_get_basename(dir->name);
			temp.dir.dirid = dir->dirid;
			temp.parent = record;
			temp.children = NULL;
			temp.pos = i;

			g_array_append_val(record->children, temp);

			g_free(dir->name);
		}
		dircount = array->len;
		g_array_free(array, TRUE);
	}

	if(db_get_wallpapers(record->dir.dirid, &array)) {
		for(int i = 0; i < array->len; i++) {
			WallsModelRecord temp;
			struct wallpaper_t *wall;

			wall = &g_array_index(array, struct wallpaper_t, i);
			temp.type = WALLS_MODEL_TYPE_WALL;
			temp.wall.filepath = g_path_get_basename(wall->filepath);
			temp.wall.id = wall->id;
			temp.wall.size = wall->size;
			temp.wall.width = wall->width;
			temp.wall.height = wall->height;

			temp.parent = record;
			temp.children = NULL;
			temp.pos = dircount + i;

			g_array_append_val(record->children, temp);

			g_free(wall->filepath);
		}
		g_array_free(array, TRUE);
	}
}

#define WALLS_MODEL_ENSURE_CHILDREN(obj) if(!(obj)->children) fill_dir((obj))

inline static WallsModelRecord *walls_model_get_record_recursive(WallsModel *walls_model, gint *indices, gint depth) {
	WallsModelRecord *temp;
	if(depth == 1) {
		return &g_array_index(walls_model->rows, WallsModelRecord, indices[depth-1]);
	} else {
		temp = walls_model_get_record_recursive(walls_model, indices, depth-1);
		WALLS_MODEL_ENSURE_CHILDREN(temp);
		return &g_array_index(temp->children, WallsModelRecord, indices[depth-1]);
	}
}

static gboolean walls_model_get_iter(GtkTreeModel *tree_model, GtkTreeIter *iter, GtkTreePath *path) {
	WallsModel *walls_model;
	WallsModelRecord *record;
	gint *indices, n, depth;

	g_assert(MODEL_IS_WALLS(tree_model));
	g_assert(path != NULL);

	walls_model = WALLS_MODEL(tree_model);

	indices = gtk_tree_path_get_indices(path);
	depth = gtk_tree_path_get_depth(path);

	n = indices[depth-1];
	//if(n >= walls_model->num_rows || n < 0)
	//	return FALSE;

	//record = &g_array_index(walls_model->rows, WallsModelRecord, n);
	record = walls_model_get_record_recursive(walls_model, indices, depth);

	g_assert(record != NULL);
	g_assert(record->pos == n);

	iter->stamp = walls_model->stamp;
	iter->user_data = record;
	iter->user_data2 = NULL;
	iter->user_data3 = NULL;

	return TRUE;
}

static GtkTreePath *walls_model_get_path(GtkTreeModel *tree_model, GtkTreeIter *iter) {
	GtkTreePath *path;
	WallsModelRecord *record;
	WallsModel *walls_model;

	g_return_val_if_fail(MODEL_IS_WALLS(tree_model), NULL);
	g_return_val_if_fail(iter != NULL, NULL);
	g_return_val_if_fail(iter->user_data != NULL, NULL);

	walls_model = WALLS_MODEL(tree_model);

	record = (WallsModelRecord*)iter->user_data;

	path = gtk_tree_path_new();
	gtk_tree_path_append_index(path, record->pos);

	return path;
}

static void walls_model_get_value(GtkTreeModel *tree_model, GtkTreeIter *iter, gint column, GValue *value) {
	WallsModelRecord *record;
	WallsModel *walls_model;

	g_return_if_fail(MODEL_IS_WALLS(walls_model));
	g_return_if_fail(iter != NULL);
	g_return_if_fail(column < WALLS_MODEL(walls_model)->n_columns);

	g_value_init(value, WALLS_MODEL(walls_model)->column_types[column]);

	walls_model = WALLS_MODEL(tree_model);

	record = (WallsModelRecord*)iter->user_data;

	g_return_if_fail(record != NULL);

	//if(record->pos >= walls_model->num_rows)
	//	g_return_if_reached();

	if(record->type == WALLS_MODEL_TYPE_DIR) {
		g_value_set_string(value, record->dir.name);
		return;
	}

	switch(column) {
		case WALLS_MODEL_COL_NAME:
			g_value_set_string(value, record->wall.filepath);
			break;
		case WALLS_MODEL_COL_ID:
			g_value_set_uint64(value, record->wall.id);
			break;
		case WALLS_MODEL_COL_SIZE:
			g_value_set_int(value, record->wall.size);
			break;
		case WALLS_MODEL_COL_WIDTH:
			g_value_set_int(value, record->wall.width);
			break;
		case WALLS_MODEL_COL_HEIGHT:
			g_value_set_int(value, record->wall.height);
			break;
	}
}

static gboolean walls_model_iter_next(GtkTreeModel *tree_model, GtkTreeIter *iter) {
	WallsModelRecord *record, *nextrecord;
	WallsModel *walls_model;
	GArray *array;

	g_return_val_if_fail(MODEL_IS_WALLS(tree_model), FALSE);

	if(iter == NULL || iter->user_data == NULL)
		return FALSE;

	walls_model = WALLS_MODEL(tree_model);

	record = (WallsModelRecord*)iter->user_data;

	WALLS_MODEL_ENSURE_CHILDREN(record);

	array = (record->parent ? record->parent->children : walls_model->rows);

	if((record->pos + 1) >= array->len)
		return FALSE;

	nextrecord = &g_array_index(array, WallsModelRecord, record->pos + 1);

	g_assert(nextrecord != NULL);
	g_assert(nextrecord->pos == (record->pos + 1));

	iter->stamp = walls_model->stamp;
	iter->user_data = nextrecord;

	return TRUE;
}

static gboolean walls_model_iter_children(GtkTreeModel *tree_model, GtkTreeIter *iter, GtkTreeIter *parent) {
	WallsModel *walls_model;
	WallsModelRecord *parent_record;

	g_return_val_if_fail(MODEL_IS_WALLS(tree_model), FALSE);

	walls_model = WALLS_MODEL(tree_model);

	if(!parent) {
		if(walls_model->num_rows == 0)
			return FALSE;
		iter->stamp = walls_model->stamp;
		iter->user_data = &g_array_index(walls_model->rows, WallsModelRecord, 0);
		return TRUE;
	}

	//g_return_val_if_fail(parent == NULL || parent->user_data != NULL, FALSE);

	parent_record = (WallsModelRecord*)parent->user_data;

	if(parent_record->type == WALLS_MODEL_TYPE_WALL)
		return FALSE;

	WALLS_MODEL_ENSURE_CHILDREN(parent_record);

	if(parent_record->children->len == 0)
		return FALSE;

	iter->stamp = walls_model->stamp;
	iter->user_data = &g_array_index(parent_record->children, WallsModelRecord, 0);

	return TRUE;
}

static gboolean walls_model_iter_has_child(GtkTreeModel *tree_model, GtkTreeIter *iter) {
	WallsModelRecord *record;

	g_return_val_if_fail(MODEL_IS_WALLS(tree_model), FALSE);

	record = (WallsModelRecord*)iter->user_data;

	if(record->type == WALLS_MODEL_TYPE_DIR) {
		//return (record->children->len > 0 ? TRUE : FALSE);
		return TRUE;
	} else
		return FALSE;
}

static gint walls_model_iter_n_children(GtkTreeModel *tree_model, GtkTreeIter *iter) {
	WallsModel *walls_model;
	WallsModelRecord *record;
	GArray *array;
	int n;

	g_return_val_if_fail(MODEL_IS_WALLS(tree_model), -1);
	g_return_val_if_fail(iter == NULL || iter->user_data != NULL, 0);

	walls_model = WALLS_MODEL(tree_model);

	if(!iter) {
		return walls_model->num_rows;
	}

	record = (WallsModelRecord*)iter->user_data;

	if(record->type == WALLS_MODEL_TYPE_WALL) {
		return 0;
	}

	//array = NULL;
	//g_return_val_if_fail(db_get_wallpapers(record->dir.dirid, &array), -1);
	//for(n = 0; (&g_array_index(array, struct wallpaper_t, n))->filepath; n++);

	WALLS_MODEL_ENSURE_CHILDREN(record);
	
	return record->children->len;

	return n;
}

static gboolean walls_model_iter_nth_child(GtkTreeModel *tree_model, GtkTreeIter *iter, GtkTreeIter *parent, gint n) {
	WallsModelRecord *record, *parent_record;
	WallsModel *walls_model;

	g_return_val_if_fail(MODEL_IS_WALLS(tree_model), FALSE);

	walls_model = WALLS_MODEL(tree_model);

	if(!parent) {
		if(n >= walls_model->num_rows)
			return FALSE;
		record = &g_array_index(walls_model->rows, WallsModelRecord, n);

		iter->stamp = walls_model->stamp;
		iter->user_data = record;

		return TRUE;
	}

	//if(n >= walls_model->num_rows)
	//	return FALSE;
	
	parent_record = parent->user_data;

	WALLS_MODEL_ENSURE_CHILDREN(parent_record);

	if(n >= parent_record->children->len)
		return FALSE;

	record = &g_array_index(parent_record->children, WallsModelRecord, n);

	g_assert(record != NULL);
	g_assert(record->pos == n);

	iter->stamp = walls_model->stamp;
	iter->user_data = record;

	return TRUE;
}

static gboolean walls_model_iter_parent(GtkTreeModel *tree_model, GtkTreeIter *iter, GtkTreeIter *child) {
	WallsModelRecord *record, *childrecord;
	WallsModel *walls_model;

	g_return_val_if_fail(MODEL_IS_WALLS(tree_model), FALSE);

	walls_model = WALLS_MODEL(tree_model);

	childrecord = (WallsModelRecord*)child->user_data;

	iter->stamp = walls_model->stamp;
	iter->user_data = childrecord->parent;

	return TRUE;
}

WallsModel *walls_model_new() {
	WallsModel *new_walls_model;

	new_walls_model = (WallsModel*)g_object_new(MODEL_TYPE_WALLS, NULL);

	g_assert(new_walls_model != NULL);

	return new_walls_model;
}