#include "esh_history.h"

void EShAddCommandToHistory(char* command) {
	int list_size = esh_info_global->history_command_list_size;
	char** list = esh_info_global->history_command_list;

	if (list_size == esh_info_global->history_limit) {
		for (int i = 0; i <= list_size / 2; ++i) {
			free(list[i]);
		}

		for (int i = list_size / 2 + 1; i < list_size; ++i) {
			list[i - (list_size / 2 + 1)] = list[i];
			list[i] = NULL;
		}

		esh_info_global->history_command_list_size -= list_size / 2 + 1;
		list_size -= list_size / 2 + 1;
	}

	list[list_size] = malloc((strlen(command) + 1) * sizeof(char));
	strcpy(list[list_size], command);
	++esh_info_global->history_command_list_size;
}

const char* EShReceiveCommandFromHistory(int step) {
	int list_size = esh_info_global->history_command_list_size;
	char** list = esh_info_global->history_command_list;
	if (step >= list_size) {
		return NULL;
	}

	return list[list_size - step - 1];
}