/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   command_list.c                                     :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: khais <marvin@42.fr>                       +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2025/02/24 17:49:46 by khais             #+#    #+#             */
/*   Updated: 2025/02/26 16:53:55 by khais            ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "command_list.h"
#include "command_list_builder.h"
#include "operator.h"
#include "libft.h"
#include "../../ft_errno.h"
#include <unistd.h>
#include <stdlib.h>

/*
** Advance the state to the next word
*/
static void	cmdlist_builder_next_word(
	t_cmdlist_builder *builder,
	t_wordlist **words)
{
	builder->current_wordlist
		= wordlist_push(builder->current_wordlist, builder->current_word);
	builder->current_word = wordlist_pop(words);
}

/*
** return true if we are currently adding the last pipeline in the chain
*/
static bool	cmdlist_builder_at_last_pipeline(t_cmdlist_builder *builder)
{
	return (builder->idx == builder->cmdlist->num_pipelines - 1);
}

/*
** Frees all memory associated with this builder and set error to true.
*/
static void	cmdlist_builder_error(t_cmdlist_builder *builder)
{
	if (builder == NULL)
		return ;
	cmdlist_destroy(builder->cmdlist);
	ft_dprintf(STDERR_FILENO, "current wordlist: %p\n", builder->current_wordlist);
	ft_dprintf(STDERR_FILENO, "current wordlist->word: %p\n", builder->current_wordlist->word);
	wordlist_destroy(builder->current_wordlist);
	ft_dprintf(STDERR_FILENO, "current wordlist has been freed: %p\n", builder->current_wordlist);
	worddesc_destroy(builder->current_word);
	builder->error = true;
}

/*
** Delimit the current pipeline, creating a new t_pipeline object.
**
** Sets the operator for that pipeline.
**
** Assumes that the current word is a valid operator.
*/
static void	cmdlist_builder_delimit(
	t_cmdlist_builder *builder,
	t_wordlist **words)
{
	ft_dprintf(STDERR_FILENO, "delimit: ");
	wordlist_debug(builder->current_wordlist);
	builder->cmdlist->pipelines[builder->idx]
		= pipeline_from_wordlist(builder->current_wordlist);
	if (builder->cmdlist->pipelines[builder->idx] == NULL)
	{
		ft_perror("invalid pipeline");
		cmdlist_builder_error(builder);
		ft_dprintf(STDERR_FILENO, "destroyed builder\n");
		return ;
	}
	if (cmdlist_builder_at_last_pipeline(builder))
		builder->cmdlist->operators[builder->idx] = OP_END;
	else
		builder->cmdlist->operators[builder->idx]
			= match_op(builder->current_word->word);
	builder->current_wordlist = NULL;
	worddesc_destroy(builder->current_word);
	builder->current_word = wordlist_pop(words);
	builder->idx++;
}

/*
** Create a new command list from the given wordlist.
*/
t_cmdlist	*cmdlist_from_wordlist(t_wordlist *words)
{
	t_cmdlist_builder	builder;

	if (setup_cmdlist_builder(&builder, &words) == NULL)
		return (NULL);
	while (builder.error == false && builder.current_word != NULL)
	{
		ft_dprintf(STDERR_FILENO, "current word: %s\n", builder.current_word->word);
		if (match_op(builder.current_word->word) == OP_INVALID)
			cmdlist_builder_next_word(&builder, &words);
		else
			cmdlist_builder_delimit(&builder, &words);
	}
	if (builder.error)
		return (NULL);
	if (builder.current_wordlist != NULL)
		cmdlist_builder_delimit(&builder, &words);
	return (builder.cmdlist);
}

/*
** destroy the given command list and all associated memory
*/
void	cmdlist_destroy(t_cmdlist *cmd)
{
	int	i;

	if (cmd == NULL)
		return ;
	i = 0;
	while (i < cmd->num_pipelines)
	{
		pipeline_destroy(cmd->pipelines[i]);
		i++;
	}
	free(cmd->pipelines);
	free(cmd->operators);
	free(cmd);
}