<?php
namespace nulib\db\_private;

class _update extends _common {
  const SCHEMA = [
    "prefix" => "?string",
    "table" => "?string",
    "schema" => "?array",
    "cols" => "?array",
    "values" => "?array",
    "where" => "?array",
    "suffix" => "?string",
  ];

  static function isa(string $sql): bool {
    return preg_match("/^update\b/i", $sql);
  }

  static function parse(array $query, ?array &$bindings=null): string {
    #XXX implémentation minimale
    $sql = [self::merge_seq($query)];

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

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

    ## set
    self::parse_set_values($query["values"], $setsql, $bindings);
    $sql[] = "set";
    $sql[] = implode(", ", $setsql);

    ## 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);
  }
}