#include "CLI.h"

#include <stddef.h>
#include <stdlib.h>

#include "../FIFOBuff/FIFOBuffChar.h"

void (*CLI_lineOut)(char* line);
CMDList_t* CMDList;
FIFOBuffChar_t* FIFO;

// initilize and register the lineout print function
bool CLI_init(CLI_lineOutFn lineOut, CMDList_t* cmdList)
{
	CLI_lineOut = lineOut;
	CMDList = cmdList;

	FIFO = FIFOBuffChar_create();
}

bool CLI_deinit()
{
	CLI_lineOut = NULL;
	CMDList = NULL;

	FIFOBuffChar_delete(FIFO);
}

char* fifoToString(FIFOBuffChar_t* fifo)
{
	char* out = malloc(fifo->size + 1);
	char* write_p = out;

	for (int i = fifo->size; i > 0; i--)
	{
		FIFOBuffChar_get(fifo, write_p);
		write_p++;
	}

	*write_p = 0;

	return out;
}

int tryExecute(FIFOBuffChar_t* fifo)
{
	char* line = fifoToString(fifo);
	CMD_t* cmd = CMDList_get(CMDList, line);
	
	if (cmd != NULL)
	{
		(*(cmd->fn))(line);
		return true;
	}
	else
	{
		printf("command not found: %s\n", line);
		return false;
	}
}

// to recive a single caracter
bool CLI_charIn(char c)
{
	bool ok = true;
	if ((c >= 'a') && (c <= 'z'))
	{
		c &= (~0x20); // convert to uppercase
	}

	if ( //TODO: update list of accepted characters
			   ((c >= 'A') && (c <= 'Z'))
			|| ((c >= '0') && (c <= '9'))
			|| (c == ' ')
			|| (c == '-')
			|| (c == '_')
		)
	{
		FIFOBuffChar_put(FIFO, c); // save char in buffer
		if (CLI_lineOut != NULL)
		{ // echo to terminal
			(*CLI_lineOut)(&c);
		}
	}
	else
	{
		switch (c)
		{
			case '\n':
			case '\r':
				if (CLI_lineOut != NULL)
				{ // echo to terminal
					(*CLI_lineOut)(&c);
				}
				FIFOBuffChar_t* fifo = FIFO;
				FIFO = FIFOBuffChar_create();
				ok = tryExecute(fifo);
				FIFOBuffChar_delete(fifo);
				break;

			//TODO: add hire backspace and arrow detection
			default:
				break;
		}
	}

	return ok;
}