#define _POSIX_C_SOURCE 200809L

#include "grammar_advanced.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "grammar_basic.h"

static enum ast_redir_type redir_tok_to_ast_type(enum token_type tok_type)
{
    switch (tok_type)
    {
    case TOKEN_REDIR_LEFT:
        return AST_REDIR_TYPE_LESS;
    case TOKEN_REDIR_RIGHT:
        return AST_REDIR_TYPE_GREAT;
        // TODO finish this
    default:
        return AST_REDIR_TYPE_NULL;
    }
}

struct ast *parse_redirection(struct lexer_context *ctx)
{
    struct token *token = PEEK_TOKEN();
    int io_number = -1;
    if (token->type == TOKEN_IONUMBER)
    {
        io_number = atoi(token->data);
        POP_TOKEN();
        token = PEEK_TOKEN();
    }

    if (!is_token_redir(token))
    {
        perror("Syntax error: expected a redirection token but got something "
               "else");
        return NULL;
    }

    enum ast_redir_type redir_type = redir_tok_to_ast_type(token->type);
    POP_TOKEN();

    token = PEEK_TOKEN();
    if (token->type != TOKEN_WORD)
    {
        perror("Syntax error: expected a word after redirection");
        return NULL;
    }
    char *target = strdup(token->data);
    POP_TOKEN();

    return ast_create_redir(target, io_number, redir_type);
}

struct ast *parse_prefix(struct lexer_context *ctx)
{
    return parse_redirection(ctx);
}