<?php
namespace nulib\db\_private;

class _delete extends _common {
  const SCHEMA = [
    "prefix" => "?string",
    "from" => "?string",
    "where" => "?array",
    "suffix" => "?string",
  ];

  static function isa(string $sql): bool {
    return preg_match("/^delete(?:\s+from)?\b/i", $sql);
  }

  static function parse(array $query, ?array &$bindings=null): string {
    #XXX implémentation minimale
    $tmpsql = self::merge_seq($query);
    self::consume('delete(?:\s+from)?\b', $tmpsql);
    $sql = ["delete from"];
    if ($tmpsql) $sql[] = $tmpsql;

    ## préfixe
    $prefix = $query["prefix"] ?? null;
    if ($prefix !== null) $sql[] = $prefix;

    ## table
    $from = $query["from"] ?? null;
    if ($from !== null) $sql[] = $from;

    ## where
    $where = $query["where"] ?? null;
    if ($where !== null) {
      self::parse_conds($where, $wheresql, $bindings);
      if ($wheresql) {
        $sql[] = "where";
        $sql[] = implode(" and ", $wheresql);
      }
    }

    ## suffixe
    $suffix = $query["suffix"] ?? null;
    if ($suffix !== null) $sql[] = $suffix;

    ## fin de la requête
    return implode(" ", $sql);
  }
}