/*
 * This file is part of the Micro Python project, http://micropython.org/
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2016 Glenn Ruben Bakke
 *
 * 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.
 */

#include <stdint.h>
#include <string.h>

#include "py/nlr.h"
#include "py/obj.h"
#include "py/runtime.h"

#include "lcd_mono_fb.h"
#include "font.h"

#define LCD_BLACK 0
#define LCD_WHITE 1

typedef struct {
	mp_obj_base_t base;
	fb_byte_t * fb_bytes;
	fb_byte_t * fb_dirty;
	uint16_t height;
	uint16_t width;
	mp_uint_t bytes_stride;
	mp_uint_t dirty_stride;
	mp_obj_t line_update_cb;
} mp_obj_framebuf_t;

static uint8_t       m_bg_color;
static uint8_t       m_fg_color;
static uint8_t       m_font_size;

STATIC void lcd_enable_pixel(mp_obj_framebuf_t * p_framebuffer, uint16_t x, uint16_t y)
{
	uint16_t column = (x / 8);
	uint16_t line   = y;
	uint8_t  bit_pos = x % 8;

	p_framebuffer->fb_bytes[line * (p_framebuffer->bytes_stride) + column].byte |= (1 << bit_pos);
	p_framebuffer->fb_dirty[y / 8].byte |= (uint8_t)(0x1 << y % 8);
}

STATIC void lcd_disable_pixel(mp_obj_framebuf_t * p_framebuffer, uint16_t x, uint16_t y)
{
    uint16_t column = (x / 8);
    uint16_t line   = y;
    uint8_t  bit_pos = x % 8;

    p_framebuffer->fb_bytes[line * (p_framebuffer->bytes_stride) + column].byte &= ~(1 << bit_pos);
    p_framebuffer->fb_dirty[y/8].byte |= (uint8_t)(0x1 << y % 8);
}

STATIC void lcd_init(mp_obj_framebuf_t * p_framebuffer)
{
	m_fg_color = LCD_BLACK;
	m_bg_color = LCD_WHITE;

	memset(p_framebuffer->fb_bytes, 0x00, p_framebuffer->bytes_stride * p_framebuffer->height);
	memset(p_framebuffer->fb_dirty, 0x00, p_framebuffer->dirty_stride);
}

STATIC void lcd_fg_color_set(mp_obj_framebuf_t * p_framebuffer, uint16_t color)
{
	m_fg_color = (color == 0) ? LCD_BLACK : LCD_WHITE;
}

#if 0
STATIC uint16_t lcd_fg_color_get(mp_obj_framebuf_t * p_framebuffer)
{
	return m_fg_color;
}
#endif

STATIC void lcd_bg_color_set(mp_obj_framebuf_t * p_framebuffer, uint16_t color)
{
	m_bg_color = (color == 0) ? LCD_BLACK : LCD_WHITE;
}

#if 0
STATIC uint16_t lcd_bg_color_get(mp_obj_framebuf_t * p_framebuffer)
{
	return m_bg_color;
}
#endif

STATIC void lcd_clear_screen(mp_obj_framebuf_t * p_framebuffer)
{
	if (m_bg_color == LCD_BLACK) {
		memset(p_framebuffer->fb_bytes, 0x00, p_framebuffer->bytes_stride * p_framebuffer->height);
	} else {
		memset(p_framebuffer->fb_bytes, 0xFF, p_framebuffer->bytes_stride * p_framebuffer->height);
	}
	memset(p_framebuffer->fb_dirty, 0xFF, p_framebuffer->dirty_stride);
}

STATIC void lcd_print_char(mp_obj_framebuf_t * p_framebuffer, uint16_t x, uint16_t y, char ch)
{

	//int column = (x / 8);
	uint16_t line   = y;
	for (uint8_t i = 0; i < 8; i++)
	{
		uint16_t current_line = line + (i * m_font_size);
		for (uint8_t x_pos = 0; x_pos < 8; x_pos++)
		{
			if (((uint8_t)font_8x8[ch - 32][i] >> x_pos) & 0x01)
			{
				for (uint8_t s_w = 0; s_w < m_font_size; s_w++)
				{
					for (uint8_t s_h = 0; s_h < m_font_size; s_h++)
					{
						if (m_fg_color < LCD_WHITE)
						{
							lcd_disable_pixel(p_framebuffer, x + (x_pos * m_font_size) + s_w, current_line + s_h);
						}
						else
						{
							lcd_enable_pixel(p_framebuffer, x + (x_pos * m_font_size) + s_w, current_line + s_h);
						}
					}
				}
			}
			else
			{
				for (uint8_t s_w = 0; s_w < m_font_size; s_w++)
				{
					for (uint8_t s_h = 0; s_h < m_font_size; s_h++)
					{
						if (m_bg_color < LCD_WHITE)
						{
							lcd_disable_pixel(p_framebuffer, x + (x_pos * m_font_size) + s_w, current_line + s_h);
						}
						else
						{
							lcd_enable_pixel(p_framebuffer, x + (x_pos * m_font_size) + s_w, current_line + s_h);
						}
					}
				}
			}
		}
	}
}

#if 0
STATIC void lcd_font_size_set(mp_obj_framebuf_t * p_framebuffer, uint8_t size)
{
	m_font_size = size;
}

STATIC uint8_t lcd_font_size_get(mp_obj_framebuf_t * p_framebuffer)
{
	return m_font_size;
}
#endif

STATIC void lcd_print_string(mp_obj_framebuf_t * p_framebuffer, uint16_t x, uint16_t y, const char * p_str)
{
	uint16_t str_len = strlen(p_str);
	for (uint16_t i = 0; i < str_len; i++)
	{
		lcd_print_char(p_framebuffer, x + (i * 8 * m_font_size), y, p_str[i]);
	}
}

STATIC void lcd_pixel_draw(mp_obj_framebuf_t * p_framebuffer, uint16_t x, uint16_t y, uint16_t color)
{
	if (color < LCD_WHITE)
	{
		lcd_disable_pixel(p_framebuffer, x, y);
	}
	else
	{
		lcd_enable_pixel(p_framebuffer, x, y);
	}
}

STATIC void lcd_update(mp_obj_framebuf_t * p_framebuffer) {
	for (uint16_t i = 0; i < p_framebuffer->dirty_stride; i++)
	{
		if (p_framebuffer->fb_dirty[i].byte != 0)
		{
			for (uint16_t b = 0; b < 8; b++)
			{
				if (((p_framebuffer->fb_dirty[i].byte >> b) & 0x01) == 1)
				{
					uint16_t line_num = (i * 8) + b;
				    mp_obj_t args[3];
				    args[0] = p_framebuffer;
				    args[1] = MP_OBJ_NEW_SMALL_INT(line_num);
				    args[2] = mp_obj_new_bytearray_by_ref(p_framebuffer->bytes_stride,
				                                          &p_framebuffer->fb_bytes[line_num * p_framebuffer->bytes_stride]);
				    mp_call_function_n_kw(p_framebuffer->line_update_cb, 3, 0, args);
				}
			}
			p_framebuffer->fb_dirty[i].byte = 0x00;
		}
	}
}

STATIC mp_obj_t lcd_mono_fb_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) {
    mp_arg_check_num(n_args, n_kw, 3, 4, false);

    mp_obj_framebuf_t *o = m_new_obj(mp_obj_framebuf_t);
    o->base.type = type;

    o->line_update_cb = args[0];

    o->width = mp_obj_get_int(args[1]);
    o->height = mp_obj_get_int(args[2]);

    o->bytes_stride = o->width / 8;
    o->dirty_stride = o->height / 8;

    o->fb_bytes = m_new(fb_byte_t, (o->bytes_stride) * o->height);
    o->fb_dirty = m_new(fb_byte_t, o->dirty_stride);

    m_font_size = 1;

    lcd_init(o);

    return MP_OBJ_FROM_PTR(o);
}

STATIC mp_obj_t lcd_mono_fb_fill(mp_obj_t self_in, mp_obj_t col_in) {
	mp_obj_framebuf_t *self = MP_OBJ_TO_PTR(self_in);
    mp_int_t col = mp_obj_get_int(col_in);


    lcd_bg_color_set(self, col);
    lcd_fg_color_set(self, !col);

    lcd_clear_screen(self);

    return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_2(lcd_mono_fb_fill_obj, lcd_mono_fb_fill);

STATIC mp_obj_t lcd_mono_fb_pixel(size_t n_args, const mp_obj_t *args) {
	mp_obj_framebuf_t *self = MP_OBJ_TO_PTR(args[0]);
    mp_int_t x = mp_obj_get_int(args[1]);
    mp_int_t y = mp_obj_get_int(args[2]);
    mp_int_t color = mp_obj_get_int(args[3]);

    lcd_pixel_draw(self, x, y, color);

    return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(lcd_mono_fb_pixel_obj, 3, 4, lcd_mono_fb_pixel);

STATIC mp_obj_t lcd_mono_fb_scroll(mp_obj_t self_in, mp_obj_t xstep_in, mp_obj_t ystep_in) {
#if 0
	mp_obj_framebuf_t *self = MP_OBJ_TO_PTR(self_in);
    mp_int_t xstep = mp_obj_get_int(xstep_in);
    mp_int_t ystep = mp_obj_get_int(ystep_in);
#endif
    return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_3(lcd_mono_fb_scroll_obj, lcd_mono_fb_scroll);

STATIC mp_obj_t lcd_mono_fb_text(size_t n_args, const mp_obj_t *args) {
    // extract arguments
	mp_obj_framebuf_t *self = MP_OBJ_TO_PTR(args[0]);
    const char *str = mp_obj_str_get_str(args[1]);
    mp_int_t x0 = mp_obj_get_int(args[2]);
    mp_int_t y0 = mp_obj_get_int(args[3]);

    lcd_print_string(self, x0, y0, str);

    return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(lcd_mono_fb_text_obj, 4, 5, lcd_mono_fb_text);


STATIC mp_obj_t lcd_mono_fb_show(mp_obj_t self_in) {
	mp_obj_framebuf_t *self = MP_OBJ_TO_PTR(self_in);

	lcd_update(self);

    return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(lcd_mono_fb_show_obj, lcd_mono_fb_show);

STATIC mp_obj_t lcd_mono_fb_del(mp_obj_t self_in) {
	mp_obj_framebuf_t *self = MP_OBJ_TO_PTR(self_in);

    m_free(self->fb_bytes);
    m_free(self->fb_dirty);

    return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(lcd_mono_fb_del_obj, lcd_mono_fb_del);

STATIC const mp_rom_map_elem_t lcd_mono_fb_locals_dict_table[] = {
    { MP_ROM_QSTR(MP_QSTR___del__), MP_ROM_PTR(&lcd_mono_fb_del_obj) },
    { MP_ROM_QSTR(MP_QSTR_fill), MP_ROM_PTR(&lcd_mono_fb_fill_obj) },
    { MP_ROM_QSTR(MP_QSTR_pixel), MP_ROM_PTR(&lcd_mono_fb_pixel_obj) },
    { MP_ROM_QSTR(MP_QSTR_scroll), MP_ROM_PTR(&lcd_mono_fb_scroll_obj) },
    { MP_ROM_QSTR(MP_QSTR_text), MP_ROM_PTR(&lcd_mono_fb_text_obj) },
	{ MP_ROM_QSTR(MP_QSTR_show), MP_ROM_PTR(&lcd_mono_fb_show_obj) },
};
STATIC MP_DEFINE_CONST_DICT(lcd_mono_fb_locals_dict, lcd_mono_fb_locals_dict_table);

STATIC const mp_obj_type_t mp_type_lcd_mono_fb = {
    { &mp_type_type },
    .name = MP_QSTR_MonoFB,
    .make_new = lcd_mono_fb_make_new,
    .locals_dict = (mp_obj_t)&lcd_mono_fb_locals_dict,
};

STATIC const mp_rom_map_elem_t lcd_mono_fb_module_globals_table[] = {
    { MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_lcd_mono_fb) },
    { MP_ROM_QSTR(MP_QSTR_MonoFB), MP_ROM_PTR(&mp_type_lcd_mono_fb) },
};

STATIC MP_DEFINE_CONST_DICT(lcd_mono_fb_module_globals, lcd_mono_fb_module_globals_table);

const mp_obj_module_t mp_module_lcd_mono_fb = {
    .base = { &mp_type_module },
    .globals = (mp_obj_dict_t*)&lcd_mono_fb_module_globals,
};