#include <stdint.h>

#include "screen_font.h"

struct glyph {
	char ch;
	uint8_t rows[SCREEN_FONT_HEIGHT];
};

static const struct glyph font[] = {
	{' ', {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}},
	{'!', {0x04, 0x04, 0x04, 0x04, 0x04, 0x00, 0x04}},
	{'.', {0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 0x0c}},
	{',', {0x00, 0x00, 0x00, 0x00, 0x0c, 0x04, 0x08}},
	{':', {0x00, 0x0c, 0x0c, 0x00, 0x0c, 0x0c, 0x00}},
	{'-', {0x00, 0x00, 0x00, 0x1f, 0x00, 0x00, 0x00}},
	{'_', {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1f}},
	{'=', {0x00, 0x00, 0x1f, 0x00, 0x1f, 0x00, 0x00}},
	{'/', {0x01, 0x02, 0x04, 0x04, 0x08, 0x10, 0x10}},
	{'0', {0x0e, 0x11, 0x13, 0x15, 0x19, 0x11, 0x0e}},
	{'1', {0x04, 0x0c, 0x04, 0x04, 0x04, 0x04, 0x0e}},
	{'2', {0x0e, 0x11, 0x01, 0x02, 0x04, 0x08, 0x1f}},
	{'3', {0x1e, 0x01, 0x01, 0x0e, 0x01, 0x01, 0x1e}},
	{'4', {0x02, 0x06, 0x0a, 0x12, 0x1f, 0x02, 0x02}},
	{'5', {0x1f, 0x10, 0x10, 0x1e, 0x01, 0x01, 0x1e}},
	{'6', {0x0e, 0x10, 0x10, 0x1e, 0x11, 0x11, 0x0e}},
	{'7', {0x1f, 0x01, 0x02, 0x04, 0x08, 0x08, 0x08}},
	{'8', {0x0e, 0x11, 0x11, 0x0e, 0x11, 0x11, 0x0e}},
	{'9', {0x0e, 0x11, 0x11, 0x0f, 0x01, 0x01, 0x0e}},
	{'A', {0x0e, 0x11, 0x11, 0x1f, 0x11, 0x11, 0x11}},
	{'B', {0x1e, 0x11, 0x11, 0x1e, 0x11, 0x11, 0x1e}},
	{'C', {0x0e, 0x11, 0x10, 0x10, 0x10, 0x11, 0x0e}},
	{'D', {0x1e, 0x11, 0x11, 0x11, 0x11, 0x11, 0x1e}},
	{'E', {0x1f, 0x10, 0x10, 0x1e, 0x10, 0x10, 0x1f}},
	{'F', {0x1f, 0x10, 0x10, 0x1e, 0x10, 0x10, 0x10}},
	{'G', {0x0e, 0x11, 0x10, 0x17, 0x11, 0x11, 0x0f}},
	{'H', {0x11, 0x11, 0x11, 0x1f, 0x11, 0x11, 0x11}},
	{'I', {0x0e, 0x04, 0x04, 0x04, 0x04, 0x04, 0x0e}},
	{'J', {0x07, 0x02, 0x02, 0x02, 0x12, 0x12, 0x0c}},
	{'K', {0x11, 0x12, 0x14, 0x18, 0x14, 0x12, 0x11}},
	{'L', {0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x1f}},
	{'M', {0x11, 0x1b, 0x15, 0x15, 0x11, 0x11, 0x11}},
	{'N', {0x11, 0x19, 0x15, 0x13, 0x11, 0x11, 0x11}},
	{'O', {0x0e, 0x11, 0x11, 0x11, 0x11, 0x11, 0x0e}},
	{'P', {0x1e, 0x11, 0x11, 0x1e, 0x10, 0x10, 0x10}},
	{'Q', {0x0e, 0x11, 0x11, 0x11, 0x15, 0x12, 0x0d}},
	{'R', {0x1e, 0x11, 0x11, 0x1e, 0x14, 0x12, 0x11}},
	{'S', {0x0f, 0x10, 0x10, 0x0e, 0x01, 0x01, 0x1e}},
	{'T', {0x1f, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04}},
	{'U', {0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x0e}},
	{'V', {0x11, 0x11, 0x11, 0x11, 0x0a, 0x0a, 0x04}},
	{'W', {0x11, 0x11, 0x11, 0x15, 0x15, 0x1b, 0x11}},
	{'X', {0x11, 0x11, 0x0a, 0x04, 0x0a, 0x11, 0x11}},
	{'Y', {0x11, 0x11, 0x0a, 0x04, 0x04, 0x04, 0x04}},
	{'Z', {0x1f, 0x01, 0x02, 0x04, 0x08, 0x10, 0x1f}},
	{'?', {0x0e, 0x11, 0x01, 0x02, 0x04, 0x00, 0x04}},
};

/**
 * screen_font_glyph() - Return a tiny bitmap glyph for early console text.
 * @ch: ASCII character requested by the early framebuffer console.
 *
 * The boot console keeps the font deliberately small: lowercase letters are
 * folded to uppercase, and unsupported characters fall back to question mark.
 */
const uint8_t *screen_font_glyph(char ch)
{
	uint32_t index;

	if (ch >= 97 && ch <= 122) {
		ch = (char)(ch - 97 + 65);
	}

	for (index = 0; index < sizeof(font) / sizeof(font[0]); index++) {
		if (font[index].ch == ch) {
			return font[index].rows;
		}
	}

	return font[sizeof(font) / sizeof(font[0]) - 1].rows;
}