/* SPDX-License-Identifier: MIT */
/*
 * konui.h
 *
 * Copyright (c) 2026 KonAki
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#ifndef KONUI_H
#define KONUI_H

#include <stdint.h>
#include <stddef.h>

#include "konwinlib.h"
#include "konsofren.h"
#include "konfont.h"

#ifdef __cplusplus
extern "C" {
#endif

/*** definition ***/

typedef struct kon_ui kon_ui_t;

typedef struct kon_uiTheme {
	uint32_t panel, title, text, textDim, widget, hover, active, accent, border;
	int padding, spacing;
} kon_uiTheme_t;

/* you own this, the ui moves it when the title bar is dragged. w is required, h = 0 sizes to the content */
typedef struct kon_uiPanel {
	int x, y, w, h;
	int collapsed;
	int contentH;
} kon_uiPanel_t;

kon_ui_t *kon_uiCreate(kon_font_t *font);
void kon_uiDestroy(kon_ui_t *ui);
kon_uiTheme_t *kon_uiTheme(kon_ui_t *ui);

/* mouse coordinates have to be in the space of the framebuffer you draw to. use kon_windowToGame for the game one */
void kon_uiFeedEvent(kon_ui_t *ui, const kon_event_t *event);

void kon_uiBegin(kon_ui_t *ui, kon_framebuffer_t *fb);
void kon_uiEnd(kon_ui_t *ui);

/* true when the ui is using the mouse or keyboard, so the game should leave them alone */
int kon_uiWantsMouse(const kon_ui_t *ui);
int kon_uiWantsKeyboard(const kon_ui_t *ui);

/* always call kon_uiEndPanel, even when this returned 0 (collapsed) */
int kon_uiBeginPanel(kon_ui_t *ui, const char *title, kon_uiPanel_t *panel);
void kon_uiEndPanel(kon_ui_t *ui);

/*** areas ***/

/* a fixed part of the window with no title and no dragging, for a layout that stays put: a side bar, a list, a preview. what is inside
   is clipped to it and scrolls with the wheel when it is taller than the area. you own this and fill in x, y, w and h, the ui keeps
   scroll and contentH. contentH is what the last frame needed, so the scroll bar shows up one frame late */
typedef struct kon_uiArea {
	int x, y, w, h;
	int scroll;
	int contentH;
} kon_uiArea_t;

/* returns 0 when it is not drawn (nothing of it is on screen, or it is inside a panel, an area or a menu). always call kon_uiEndArea */
int kon_uiBeginArea(kon_ui_t *ui, const char *id, kon_uiArea_t *area);
void kon_uiEndArea(kon_ui_t *ui);

/*** menus ***/

/* a bar along the top of the window, kon_uiMenuBarHeight is how tall it is so you can lay the rest out under it.
   kon_uiBeginMenu gives 1 while that menu is open, and then its items are kon_uiMenuItem, which gives 1 when one is clicked.
   always call kon_uiEndMenu and kon_uiEndMenuBar. what is open is drawn over everything at the end of the frame.
   a menu is as long as its items, up to 600 pixels, the rest is cut off

	if (kon_uiBeginMenuBar(ui)) {
		if (kon_uiBeginMenu(ui, "File")) {
			if (kon_uiMenuItem(ui, "Open", "Ctrl+O")) open();
			kon_uiMenuSeparator(ui);
			if (kon_uiMenuItem(ui, "Quit", NULL)) quit();
		}
		kon_uiEndMenu(ui);
	}
	kon_uiEndMenuBar(ui);
*/
int kon_uiBeginMenuBar(kon_ui_t *ui);
void kon_uiEndMenuBar(kon_ui_t *ui);
int kon_uiMenuBarHeight(const kon_ui_t *ui);
int kon_uiBeginMenu(kon_ui_t *ui, const char *label);
int kon_uiMenuItem(kon_ui_t *ui, const char *label, const char *shortcut);
void kon_uiMenuSeparator(kon_ui_t *ui);
void kon_uiEndMenu(kon_ui_t *ui);

/* anything after ## in a label is part of the id but not drawn, so "ok##a" and "ok##b" are different buttons */
void kon_uiLabel(kon_ui_t *ui, const char *text);
void kon_uiLabelf(kon_ui_t *ui, const char *format, ...);
int kon_uiButton(kon_ui_t *ui, const char *label);
int kon_uiCheckbox(kon_ui_t *ui, const char *label, int *value);
int kon_uiSliderFloat(kon_ui_t *ui, const char *label, float *value, float min, float max);
int kon_uiSliderInt(kon_ui_t *ui, const char *label, int *value, int min, int max);
int kon_uiSelectable(kon_ui_t *ui, const char *label, int selected);

/* returns 1 when enter is pressed. label is shown while the field is empty */
int kon_uiTextInput(kon_ui_t *ui, const char *label, char *buffer, size_t size);

/* a row of tabs, current is the one shown. returns 1 when another one was clicked */
int kon_uiTabs(kon_ui_t *ui, const char *const *labels, int count, int *current);

/* a line with a + or - in front that opens and closes. returns the new open state, show what is inside when it is 1 and use
   kon_uiIndent to push it in */
int kon_uiTreeNode(kon_ui_t *ui, const char *label, int *open);
void kon_uiIndent(kon_ui_t *ui, int amount);

void kon_uiSeparator(kon_ui_t *ui);
void kon_uiSameLine(kon_ui_t *ui);
void kon_uiPushId(kon_ui_t *ui, int id);
void kon_uiPopId(kon_ui_t *ui);

kon_rect_t kon_uiLastRect(const kon_ui_t *ui);


#ifdef __cplusplus
}
#endif
#endif