#include "types.h"
#include "kbd.h"
#include "stlio.h"

extern char kbd_prev_key;
extern int kbd_prev_active;
static u8 COLOR_FG = Green;
static u8 COLOR_BG = White;

#define write_char(c) write_cell_fb(c, COLOR_FG, COLOR_BG)

// We are assuming null-terminated strings here
u32 strlen(const char* buffer) {
	u32 i = 0;
	char c = buffer[i];
	while(c != '\0') {
		i++;
		c = buffer[i];
	}
	return i;
}

u32 write(const char* buffer, const u32 size) {
	u32 i;
	for(i = 0; i < size; i++) {
		// cheesy but whatever
		if(buffer[i] == '\n') {
			frame_buffer_newline();
		}
		else {
			write_char(buffer[i]);
		}
	}
	return i;
}

u32 read(char* buffer, u32 size) {
	// Read up to size-1 characters or until a \n is written
	// once we reacch size -1 bytes read then we change the last char to a \0
	kbd_prev_active = false; // we only do this to discard the leftovers from 
	u32 bytes_read = 0;

	while(bytes_read < size-1) {
		if(kbd_prev_active) {
			bytes_read++;
			if(kbd_prev_key == '\n') {
				break;
			}
			else {
				buffer[bytes_read] = kbd_prev_key;
			}
		}
	}
	printf("You entered: "); printf(buffer);
	return bytes_read;
}
void printf(const char* fmt) {
	// Variadic fuller version of print on seperate branch but its nowhere near stable/ready/working
	u32 size = strlen(fmt);
	for(u32 i = 0; i < size;i++) {
		if(fmt[i] == '\n') {
			frame_buffer_newline();
		}
		else {
			write_char(fmt[i]);
		}
	}
}

void printhex(u32 num) {
	// Prints our hex version of whatever is given
	const char _chars[] = "0123456789abcdef";
	u32 idx = 0; // used as hash into the _chars mapping
	// iterate over each nibble
	for(u32 i = 0 ;i < 8;i++) {
		idx = (num << (i * 4)) & 0xf0000000;
		idx = idx >> 28;
		putch(_chars[idx]);
	}
}

void putch(const char c) {
	if(c == '\n') {
		frame_buffer_newline();
	}
	else {
		write_char(c);
	}
}