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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2017 Olaf Wintermann. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   1. Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *
 *   2. Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef UI_TREE_H
#define	UI_TREE_H

#include "toolkit.h"

#ifdef	__cplusplus
extern "C" {
#endif

typedef struct UiModel          UiModel;
typedef struct UiListCallbacks  UiListCallbacks;
typedef struct UiListDnd        UiListDnd;

typedef struct UiListArgs       UiListArgs;
typedef struct UiSourceListArgs UiSourceListArgs;

typedef struct UiSubList        UiSubList;
typedef struct UiSubListItem    UiSubListItem;

typedef enum UiModelType {
    UI_STRING = 0,
    UI_STRING_FREE,
    UI_INTEGER,
    UI_ICON,
    UI_ICON_TEXT,
    UI_ICON_TEXT_FREE,
    UI_STRING_EDITABLE,
    UI_BOOL_EDITABLE
} UiModelType;

typedef struct UiCellValue {
    union {
        const char *string;
        int64_t i;
        UiBool b;
    };
    UiModelType type;
} UiCellValue;

typedef UiBool (*ui_list_savefunc)(UiList *list, int row, int col, UiCellValue *value, void *userdata);

struct UiModel {
    /*
     * number of columns
     */
    int columns;
    
    /*
     * current allocation size (internal)
     */
    int alloc;
    
    /*
     * array of column types
     * array length is the number of columns
     */
    UiModelType *types;
    
    /*
     * array of column titles
     * array length is the number of columns
     */
    char **titles;
    
    /*
     * array of column size hints
     */
    int *columnsize;
};

struct UiListCallbacks {
    /*
     * selection callback
     */
    ui_callback activate;
    
    /*
     * cursor callback
     */
    ui_callback selection;
    
    /*
     * userdata for all callbacks
     */
    void *userdata;
};

struct UiListArgs {
    UiBool fill;
    UiBool hexpand;
    UiBool vexpand;
    UiBool hfill;
    UiBool vfill;
    UiBool override_defaults;
    int margin;
    int margin_left;
    int margin_right;
    int margin_top;
    int margin_bottom;
    int colspan;
    int rowspan;
    int width;
    int height;

    const char *name;
    const char *style_class;
    UiList* list;
    const char* varname;
    UiModel* model;
    char **static_elements;
    size_t static_nelm;
    ui_getvaluefunc getvalue;
    ui_getvaluefunc2 getvalue2;
    void *getvalue2data;
    ui_getstylefunc getstyle;
    void *getstyledata;
    ui_callback onactivate;
    void* onactivatedata;
    ui_callback onselection;
    void* onselectiondata;
    ui_callback ondragstart;
    void* ondragstartdata;
    ui_callback ondragcomplete;
    void* ondragcompletedata;
    ui_callback ondrop;
    void* ondropdata;
    UiBool multiselection;
    UiMenuBuilder *contextmenu;
    ui_list_savefunc onsave;
    void *onsavedata;
    
    const int *groups;
};

typedef void (*ui_sublist_getvalue_func)(UiList *list, void *sublist_userdata, void *rowdata, int index, UiSubListItem *item, void *userdata);

struct UiSubList {
    UiList *value;
    const char *varname;
    const char *header;
    UiBool separator;
    void *userdata;
};

typedef struct UiSubListEventData {
    UiList *list;
    int    sublist_index;
    int    row_index;
    void   *row_data;
    void   *sublist_userdata;
    void   *event_data;
} UiSubListEventData;

/*
 * list item members must be filled by the sublist getvalue func
 * all members must be allocated (by malloc, strdup, ...) the pointer
 * will be passed to free
 */
struct UiSubListItem {
    char          *icon;
    char          *label;
    char          *button_icon;
    char          *button_label;
    UiMenuBuilder *button_menu;
    char          *badge;
    void          *eventdata;
};

struct UiSourceListArgs {
    UiBool fill;
    UiBool hexpand;
    UiBool vexpand;
    UiBool hfill;
    UiBool vfill;
    UiBool override_defaults;
    int margin;
    int margin_left;
    int margin_right;
    int margin_top;
    int margin_bottom;
    int colspan;
    int rowspan;
    int width;
    int height;
    const char *name;
    const char *style_class;
    
    const int *groups;
    
    /*
     * static list of sublists
     * a sublist must have a varname or a value
     * 
     * the last entry in the list must contain all NULL values or numsublists
     * must contain the number of sublists
     * 
     * sublists can be NULL, in which case sublists are dynamically loaded
     * from dynamic_sublist/varname
     */
    UiSubList *sublists;
    /*
     * optional number of sublists
     * if the value is 0, it is assumed, that sublists is null-terminated
     * (last item contains only NULL values)
     */
    size_t numsublists;
    
    /*
     * list value, that contains UiSubList* elements
     */
    UiList *dynamic_sublist;
    
    /*
     * load sublists dynamically from a variable with the specified name
     */
    const char *varname;
    
    
    /*
     * callback for each list item, that should fill all necessary
     * UiSubListItem fields
     */
    ui_sublist_getvalue_func getvalue;
    
    /*
     * getvalue_func userdata
     */
    void *getvaluedata;
    
    /*
     * is a sublist header a selectable item
     */
    UiBool header_is_item;
    
    /*
     * activated when a list item is selected
     */
    ui_callback onactivate;
    void        *onactivatedata;
    
    /*
     * activated, when the additional list item button is clicked
     */
    ui_callback onbuttonclick;
    void        *onbuttonclickdata;
    
    UiMenuBuilder *contextmenu;
};

#define UI_SUBLIST(...) (UiSubList){ __VA_ARGS__ }
#define UI_SUBLISTS(...) (UiSubList[]){ __VA_ARGS__, (UiSubList){NULL,NULL,NULL,0} }


/*
 * Creates an UiModel, that specifies columns for a table widget.
 *
 * For each column a column type (UiModelType) and a title string
 * (char*) must be specified. The column list must be terminated
 * with -1.
 *
 * UiModel *model = ui_model(ctx, UI_STRING, "Column 1", UI_STRING, "Column 2", -1);
 */
UIEXPORT UiModel* ui_model(UiContext *ctx, ...);
UIEXPORT UiModel* ui_model_new(UiContext *ctx);
UIEXPORT void ui_model_add_column(UiContext *ctx, UiModel *model, UiModelType type, const char *title, int width);
UIEXPORT UiModel* ui_model_copy(UiContext *ctx, UiModel* model);
UIEXPORT void ui_model_free(UiContext *ctx, UiModel *mi);

#define ui_listview(obj, ...) ui_listview_create(obj, &(UiListArgs) { __VA_ARGS__ } )
#define ui_table(obj, ...) ui_table_create(obj, &(UiListArgs) { __VA_ARGS__ } )
#define ui_combobox(obj, ...) ui_combobox_create(obj, &(UiListArgs) { __VA_ARGS__ } )
#define ui_breadcrumbbar(obj, ...) ui_breadcrumbbar_create(obj, &(UiListArgs) { __VA_ARGS__ } )
#define ui_sourcelist(obj, ...) ui_sourcelist_create(obj, &(UiSourceListArgs) { __VA_ARGS__ } )

UIEXPORT UIWIDGET ui_listview_create(UiObject* obj, UiListArgs *args);
UIEXPORT UIWIDGET ui_table_create(UiObject* obj, UiListArgs *args);
UIEXPORT UIWIDGET ui_combobox_create(UiObject* obj, UiListArgs *args);
UIEXPORT UIWIDGET ui_breadcrumbbar_create(UiObject* obj, UiListArgs *args);

UIEXPORT void ui_listview_select(UIWIDGET listview, int index);
UIEXPORT void ui_combobox_select(UIWIDGET dropdown, int index);

UIEXPORT UIWIDGET ui_sourcelist_create(UiObject *obj, UiSourceListArgs *args);

UIEXPORT void ui_sublist_item_set_icon(UiSubListItem *item, const char *icon);
UIEXPORT void ui_sublist_item_set_label(UiSubListItem *item, const char *label);
UIEXPORT void ui_sublist_item_set_button_icon(UiSubListItem *item, const char *button_icon);
UIEXPORT void ui_sublist_item_set_button_label(UiSubListItem *item, const char *button_label);
UIEXPORT void ui_sublist_item_set_button_menu(UiSubListItem *item, UiMenuBuilder *menu);
UIEXPORT void ui_sublist_item_set_badge(UiSubListItem *item, const char *badge);
UIEXPORT void ui_sublist_item_set_eventdata(UiSubListItem *item, void *eventdata);



/*
 * Only relevant for some language bindings
 */
typedef void(*ui_sourcelist_update_func)(void);

/*
 * The sourcelist update callback is called after any source list
 * sublist update is completed
 */
UIEXPORT void ui_sourcelist_set_update_callback(ui_sourcelist_update_func cb);

#ifdef	__cplusplus
}
#endif

#endif	/* UI_TREE_H */