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/*
 * Copyright (c) 2018-2019 Hanspeter Portner (dev@open-music-kontrollers.ch)
 *
 * This is free software: you can redistribute it and/or modify
 * it under the terms of the Artistic License 2.0 as published by
 * The Perl Foundation.
 *
 * This source 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
 * Artistic License 2.0 for more details.
 *
 * You should have received a copy of the Artistic License 2.0
 * along the source as a COPYING file. If not, obtain it from
 * http://www.perlfoundation.org/artistic_license_2_0.
 */

#include <inttypes.h>
#include <math.h>
#include <stdio.h>

#include "base_internal.h"

static inline void
_d2tk_base_draw_bar(d2tk_core_t *core, const d2tk_rect_t *rect,
	d2tk_state_t state, const d2tk_style_t *style, float rel)
{
	const d2tk_hash_dict_t dict [] = {
		{ rect, sizeof(d2tk_rect_t) },
		{ &state , sizeof(d2tk_state_t) },
		{ style, sizeof(d2tk_style_t) },
		{ &rel, sizeof(float) },
		{ NULL, 0 }
	};
	const uint64_t hash = d2tk_hash_dict(dict);

	D2TK_CORE_WIDGET(core, hash, widget)
	{
		d2tk_rect_t bnd_outer;
		d2tk_rect_t bnd_inner;
		d2tk_rect_shrink(&bnd_outer, rect, style->padding);
		d2tk_rect_shrink(&bnd_inner, &bnd_outer, 2*style->padding);

		d2tk_triple_t triple = D2TK_TRIPLE_NONE;
		d2tk_triple_t triple_active = D2TK_TRIPLE_ACTIVE;
		d2tk_triple_t triple_inactive = D2TK_TRIPLE_NONE;

		if(d2tk_state_is_active(state))
		{
			triple |= D2TK_TRIPLE_ACTIVE;
		}

		if(d2tk_state_is_hot(state))
		{
			triple |= D2TK_TRIPLE_HOT;
			triple_active |= D2TK_TRIPLE_HOT;
			triple_inactive |= D2TK_TRIPLE_HOT;
		}

		if(d2tk_state_is_focused(state))
		{
			triple |= D2TK_TRIPLE_FOCUS;
			triple_active |= D2TK_TRIPLE_FOCUS;
			triple_inactive |= D2TK_TRIPLE_FOCUS;
		}

		{
			const size_t ref = d2tk_core_bbox_push(core, true, rect);

			d2tk_core_begin_path(core);
			d2tk_core_rounded_rect(core, &bnd_inner, style->rounding);
			d2tk_core_color(core, style->fill_color[triple_inactive]);
			d2tk_core_stroke_width(core, 0);
			d2tk_core_fill(core);

			bnd_inner.w *= rel;

			d2tk_core_begin_path(core);
			d2tk_core_rounded_rect(core, &bnd_inner, style->rounding);
			d2tk_core_color(core, style->fill_color[triple_active]);
			d2tk_core_stroke_width(core, 0);
			d2tk_core_fill(core);

			d2tk_core_begin_path(core);
			d2tk_core_rounded_rect(core, &bnd_outer, style->rounding);
			d2tk_core_color(core, style->stroke_color[triple]);
			d2tk_core_stroke_width(core, style->border_width);
			d2tk_core_stroke(core);

			d2tk_core_bbox_pop(core, ref);
		}
	}
}

D2TK_API d2tk_state_t
d2tk_base_bar_int32(d2tk_base_t *base, d2tk_id_t id, const d2tk_rect_t *rect,
	int32_t min, int32_t *value, int32_t max)
{
	d2tk_state_t state = d2tk_base_is_active_hot(base, id, rect,
		D2TK_FLAG_SCROLL);

	const int32_t oldvalue = *value;

	if(d2tk_state_is_scroll_up(state))
	{
		*value += base->scroll.ody;
		d2tk_clip_int32(min, value, max);
	}
	else if(d2tk_state_is_scroll_down(state))
	{
		*value += base->scroll.ody;
		d2tk_clip_int32(min, value, max);
	}
	else if(d2tk_state_is_motion(state))
	{
		const int32_t adx = abs(base->mouse.dx);
		const int32_t ady = abs(base->mouse.dy);
		const int32_t adz = adx > ady ? base->mouse.dx : -base->mouse.dy;

		*value += adz;
		d2tk_clip_int32(min, value, max);
	}

	if(oldvalue != *value)
	{
		state |= D2TK_STATE_CHANGED;
	}

	float rel = (float)(*value - min) / (max - min);
	d2tk_clip_float(0.f, &rel, 1.f);

	_d2tk_base_draw_bar(base->core, rect, state, d2tk_base_get_style(base), rel);

	return state;
}