#include "command.h"

#include <stdbool.h>
#include <stdio.h>

static int command_name_compare(const char *cmd_name, const char *target)
{
	int score = 0;

	for (size_t i = 0;; i++) {
		if (cmd_name[i] != target[i]) {
			break;
		}

		if (!cmd_name[i]) {
			break;
		}

		score++;
	}

	return score;
}

const struct command *command_find(
	const struct command **commands,
	size_t nr_commands,
	const char *name)
{
	int best_score = 0;
	const struct command *best_match = NULL;
	bool ambiguous = false;

	for (size_t i = 0; i < nr_commands; i++) {
		int score = command_name_compare(commands[i]->cmd_name, name);
		if (score == best_score && score > 0) {
			ambiguous = true;
		}

		if (score > best_score) {
			ambiguous = false;
			best_score = score;
			best_match = commands[i];
		}
	}

	if (!best_match) {
		printf("'%s' is not a valid command.\n", name);
		return NULL;
	}

	if (!ambiguous) {
		return best_match;
	}

	printf("command name '%s' is ambiguous, and could refer to multiple "
	       "commands.\n",
	       name);
	return NULL;
}

int command_execute(
	const struct command *cmd,
	struct debug_context *ctx,
	int argc,
	const char **argv,
	void *argp)
{
	if (!cmd->cmd_callback) {
		return -1;
	}

	return cmd->cmd_callback(cmd, ctx, argc, argv, argp);
}