/*
 * shell.c
 *
 *  Created on: Aug 1, 2016
 *      Author: tkl
 */

#include <stddef.h>
#include <stdbool.h>
#include <string.h>

#include "stack.h"
#include "queue.h"
#include "driver.h"
#include "kernel.h"
#include "list.h"
#include "shell.h"

struct shell_object {
	struct list command_list;
	const struct driver *shell_device;
};

struct shell_object shell_object;

#define RX_STACK_SIZE  256
stack_t rx_stack[RX_STACK_SIZE];
struct thread_context rx_thread;

static void parse(const char *buffer, unsigned int len)
{
	if(NULL == buffer)
		return;
	struct list_node *it = shell_object.command_list.front;
	while(it != NULL) {
		struct command *cmd = (struct command *)it->data;
		if(strstr(buffer, cmd->command)) {
			cmd->command_callback(buffer);
			return;
		}
		it = it->next;
	}
}

static void rx_func(void *arg)
{
	char buffer[80];
	unsigned int index = 0;
	int ret = 0;
	open(shell_object.shell_device);
	while(1) {
		ret = read(shell_object.shell_device, &buffer[index],
				sizeof(buffer) / sizeof(buffer[0]) - index);
		if(ret) {
			if((buffer[index + ret - 1] == '\n') || (buffer[index + ret - 1] == '\r')) {
				buffer[index + ret - 1] = '\n';
				parse(buffer, index + ret);
				index = 0;
			}
			else
				index += ret;
		}
	}
}

int shell_init(const struct driver *shell_device)
{
	if(NULL == shell_device)
		return -1;
	list_init(&shell_object.command_list);
	shell_object.shell_device = shell_device;
	thread_create(&rx_thread, rx_stack, RX_STACK_SIZE, rx_func, NULL, THREAD_PRIO_LOW);
	return 0;
}

int shell_add_command(struct command *command)
{
	if(NULL == command)
		return -1;
	command->item.data = (unsigned int) command;
	list_add(&shell_object.command_list, &command->item);
	return 1;
}