/*
 * Copyright (C) 2021  P. J. McDermott
 *
 * This file is part of Maze Fight
 *
 * Maze Fight 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.
 *
 * Maze Fight 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 Maze Fight.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <SDL.h>
#include <math.h>
#include "../tk.h"
#include "widget.h"

struct mftk_check {
	struct mftk_widget    parent;
	enum mftk_check_shape shape;
	int                   butn_width;
	int                   butn_padding;
	SDL_Color            *butn_color;
	SDL_Color            *mark_color;
	int                   state;
	int                   label_padding;
	struct mftk_widget   *label;
	int                   steals_focus;
	int                 (*action)(void *, int);
	void                 *user_data;
};

void
mftk_check_set_shape(struct mftk_widget *w, enum mftk_check_shape shape)
{
	struct mftk_check *c = (struct mftk_check *) w;

	c->shape = shape;
}

void
mftk_check_set_state(struct mftk_widget *w, int state)
{
	struct mftk_check *c = (struct mftk_check *) w;

	c->state = state;
}

void
mftk_check_set_steals_focus(struct mftk_widget *w, int steals_focus)
{
	struct mftk_check *c = (struct mftk_check *) w;

	c->steals_focus = steals_focus;
}

static void
_mftk_check_layout(struct mftk_widget *w)
{
	struct mftk_check *c = (struct mftk_check *) w;

	if (c->label != NULL) {
		mftk_widget_layout(c->label);
	}

	w->w = c->butn_width;
	if (c->label != NULL) {
		w->w += c->label_padding + c->label->w;
	}
	w->h = c->butn_width;
	if (c->label != NULL && c->label->h > w->h) {
		w->h = c->label->h;
	}
}

static void
_mftk_check_focus(struct mftk_widget *w __attribute__((__unused__)))
{
	/* Nothing to do */
}

static void
_mftk_check_defocus(struct mftk_widget *w __attribute__((__unused__)))
{
	/* Nothing to do */
}

static int
_mftk_check_key_event(struct mftk_widget *w, SDL_Event *e)
{
	struct mftk_check *c = (struct mftk_check *) w;

	switch (e->type) {
		case SDL_KEYDOWN:
			switch (e->key.keysym.sym) {
				case SDLK_SPACE:
				case SDLK_RETURN:
					c->state = !c->state;
					if (c->action == NULL) {
						return 0;
					}
					return c->action(c->user_data,c->state);
				default:
					break;
			}
		default:
			break;
	}

	return 0;
}

static int
_mftk_check_mouse_event(struct mftk_widget *w, SDL_Event *e,
		int x __attribute__((__unused__)),
		int y __attribute__((__unused__)))
{
	struct mftk_check *c = (struct mftk_check *) w;

	switch (e->type) {
		case SDL_MOUSEBUTTONUP:
			if (e->button.button == SDL_BUTTON_LEFT) {
				if (c->steals_focus == SDL_TRUE) {
					mftk_window_focus(w->window, w);
				}
				c->state = !c->state;
				if (c->action == NULL) {
					return 0;
				}
				return c->action(c->user_data, c->state);
			}
			break;
		default:
			break;
	}

	return 0;
}

static int
_mftk_check_render_box(SDL_Rect *rect, SDL_Color *color, SDL_Renderer *renderer)
{
	if (SDL_SetRenderDrawColor(renderer,
				color->r, color->g, color->b, color->a) < 0 ||
			SDL_RenderFillRect(renderer, rect) < 0) {
		SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
				"Couldn't render widget: %s",
				SDL_GetError());
		return -1;
	}

	return 0;
}

static int
_mftk_check_render_cir(SDL_Rect *rect, SDL_Color *color, SDL_Renderer *renderer)
{
	int e = 0;
	int r;
	int x;
	int y;
	int i;

	if (SDL_SetRenderDrawColor(renderer,
				color->r, color->g, color->b, color->a) < 0) {
		SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
				"Couldn't render widget: %s",
				SDL_GetError());
		e = -1;
	}

#define _mftk_check_px(X, Y) \
	do { \
		if (SDL_RenderDrawPoint(renderer, \
					rect->x + r + X, rect->y + r + Y) < 0){\
			SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, \
					"Couldn't render widget: %s", \
					SDL_GetError()); \
			e = -1; \
		} \
	} while (0)

	r = rect->w / 2;
	for (x = 0, y = r; y > x; ++x) {
		y = round(sqrt((r-0.5)*(r-0.5) - (x-0.5)*(x-0.5)) + 0.5);
		for (i = 0; i <=   y; ++i) _mftk_check_px(  x,   i);
		for (i = 0; i >= 0-y; --i) _mftk_check_px(  x,   i);
		for (i = 0; i <=   y; ++i) _mftk_check_px(0-x,   i);
		for (i = 0; i >= 0-y; --i) _mftk_check_px(0-x,   i);
		for (i = 0; i <=   y; ++i) _mftk_check_px(  i,   x);
		for (i = 0; i <=   y; ++i) _mftk_check_px(  i, 0-x);
		for (i = 0; i >= 0-y; --i) _mftk_check_px(  i,   x);
		for (i = 0; i >= 0-y; --i) _mftk_check_px(  i, 0-x);
	}

#undef _mftk_check_px

	return e;
}

static int
_mftk_check_render(struct mftk_widget *w, SDL_Renderer *renderer, int x, int y)
{
	struct mftk_check *c = (struct mftk_check *) w;
	SDL_Rect           rect;
	int                e = 0;

	rect.x = x;
	rect.y = y;
	rect.w = c->butn_width;
	rect.h = c->butn_width;
	if (c->shape == MFTK_CHECK_SHAPE_BOX) {
		if (_mftk_check_render_box(&rect, c->butn_color, renderer) < 0){
			e = -1;
		}
	} else {
		if (_mftk_check_render_cir(&rect, c->butn_color, renderer) < 0){
			e = -1;
		}
	}

	if (c->state == SDL_TRUE) {
		rect.x += c->butn_padding;
		rect.y += c->butn_padding;
		rect.w -= c->butn_padding * 2;
		rect.h -= c->butn_padding * 2;
		if (c->shape == MFTK_CHECK_SHAPE_BOX) {
			if (_mftk_check_render_box(&rect, c->mark_color,
						renderer) < 0) {
				e = -1;
			}
		} else {
			if (_mftk_check_render_cir(&rect, c->mark_color,
						renderer) < 0) {
				e = -1;
			}
		}
	}

	if (c->label != NULL && mftk_widget_render(c->label, renderer,
				x + c->butn_width + c->label_padding, y) < 0) {
		e = -1;
	}

	return e;
}

static void
_mftk_check_destroy(struct mftk_widget *w)
{
	struct mftk_check *c = (struct mftk_check *) w;

	if (c->label != NULL) {
		mftk_widget_destroy(&c->label);
	}
}

struct mftk_widget *
mftk_check_new(int butn_width, int butn_padding, SDL_Color *butn_color,
		SDL_Color *mark_color, int state, int label_padding,
		TTF_Font *font, const char *text, SDL_Color *text_color,
		int (*action)(void *, int), void *user_data,
		SDL_Renderer *renderer)
{
	struct mftk_widget *w;
	struct mftk_check  *c;

	mftk_widget_init_focusable(w, c, check);

	if (font != NULL && text != NULL && text_color != NULL) {
		c->label = mftk_label_new(font, text, text_color, renderer);
		if (c->label == NULL) {
			free(c);
			return NULL;
		}
	}

	c->shape         = MFTK_CHECK_SHAPE_BOX;
	c->butn_width    = butn_width;
	c->butn_padding  = butn_padding;
	c->butn_color    = butn_color;
	c->mark_color    = mark_color;
	c->state         = state;
	c->label_padding = label_padding;
	c->steals_focus  = SDL_TRUE;
	c->action        = action;
	c->user_data     = user_data;

	return w;
}