<?php
  require_once("../config.php");

  /* val
   * 
   * select => ["var1", "var2"...]
   * insert|update|where => ["key1" => "value1", "key2" => "value2"...]
   * order => ["var", "asc"|"desc"]
   * limit => int
   * */
  function lolidb (string $table, array $val, string $mode="select"): array|bool {
    // モードは違う場合、やめる。If the mode is wrong, stop.
    if ($mode != "select" && $mode != "one" && $mode != "insert" && $mode != "update" && $mode != "delete") {
      dd("モードは「select」、「one」、「insert」、「update」、「delete」です。\nMode should be \"select\", \"one\", \"insert\", \"update\", or \"delete\".");
      return false;
    }

    // 順のチェック。Check order.
    if (isset($val["order"])) {
      // selectかoneじゃない場合。If not select or one.
      if ($mode !== "select" || $mode !== "one") {
        dd("「order」は「select」又は「one」のみで使えます。\n\"order\" can only be used with \"select\" or \"one\".");
        return false;
      }

      // 複数の場合。If multiple.
      if (count($val["order"] > 1)) {
        dd("複数「order」は未対応です。\nMultiple \"order\" is not yet supported.");
        return false;
      }

      // ascかdescかどうか。Whether it"s asc or desc.
      foreach ($val["order"] as $k => $v) {
        if ($v !== "asc" && $v !== "desc") {
          dd("「order」は「asc」又は「desc」です。\n\"order\" should be \"asc\" or \"desc\".");
          return false;
        }
      }
    }

    // 限界のチェック。Check limit.
    if (($mode === "select" || $mode === "one") && isset($val["limit"])) {
      // oneの場合。If one.
      if ($mode === "one") {
        dd("「one」の場合、「limit」はいつでも「1」です。「limit」は1以上は必要の場合、「select」を使って下さい。\nIn case of \"one\", \"limit\" is always \"1\". If \"limit\" needs to be more than \"1\", please use \"select\".");
        return false;
      }

      // selectじゃない場合。If not select.
      else if ($mode !== "select") {
        dd("「insert」、「update」及び「delete」で、「limit」を使えません。\n\"limit\" cannot be used with \"insert\", \"update\", and \"delete\".");
        return false;
      }
    }

    // insertの場合。In case of insert.
    if ($mode === "insert" && !isset($val["insert"])) {
      dd("「insert」モードの場合、「insert」値は必須です。\nIn case of \"insert\" mode, \"insert\" value is necessary.");
      return false;
    }

    // updateの場合。In case of update.
    if ($mode === "update" && !isset($val["update"])) {
      dd("「update」モードの場合、「update」値は必須です。\nIn case of \"update\" mode, \"update\" value is necessary.");
      return false;
    }

    // MySQLiの創作。Creation of MySQLi.
    $mysqli = mysqli_connect(DB_HOST, DB_USER, DB_PASS, DB_TABLE);
    $result = null;

    if ($mode == "select" || $mode == "one") {
      // select値がなければ、全部を選択する。If there is no select value, select everything.
      if (!isset($val["select"])) {
        $val["select"] = ["*"];
      }

      $query = "SELECT ".$val["select"]." FROM ".$table;

      if (isset($val["where"])) {
        $query .= " WHERE ";
        foreach ($val["where"] as $k => $v) {
          $query .= $k." = ".$v;
          if ($k !== array_key_last($val["where"])) $query .= " AND ";
        }
      }

      if (isset($val["order"])) {
        $query .= " ORDER BY ";
        foreach ($val["order"] as $k => $v) {
          $query .= $k;
          $query .= " ".strtoupper($v);
        }
      }

      if ($mode == "one") {
        $query .= " LIMIT 1";
      }
      else {
        if (isset($val["limit"])) {
          $query .= " LIMIT ".(int)$val["limit"];
        }
      }

      $result = mysqli_query($mysqli, $query.";");
      $row = mysqli_fetch_assoc($result);
    }
    else {
      if ($mode == "insert") {
        $query .= "INSERT INTO ".$table." (";
        foreach ($val["insert"] as $k => $v) {
          $query .= $k;
          if ($k !== array_key_last($val["insert"])) {
            $query .= ", ";
          }
        }
        $query .= ") VALUES (";
        foreach ($val["insert"] as $k => $v) {
          $query .= $v;
          if ($k !== array_key_last($val["insert"])) {
            $query .= ", ";
          }
        }
        $query .= ")";
      }
      else if ($mode == "update") {
        $query .= "UPDATE ".$table." SET ";
        foreach ($val["update"] as $k => $v) {
          $query .= $k." = ".$v;
          if ($k !== array_key_last($val["update"])) {
            $query .= ", ";
          }
        }

        if (isset($val["where"])) {
          $query .= " WHERE ";
          foreach ($val["where"] as $k => $v) {
            $query .= $k." = ".$v;
            if ($k !== array_key_last($val["where"])) {
              $query .= " AND ";
            }
          }
        }
      }
      else if ($mode == "delete") {
        $query .= "DELETE FROM ".$table;

        if (isset($val["where"])) {
          $query .= " WHERE ";
          foreach ($val["where"] as $k => $v) {
            $query .= $k." = ".$v;
            if ($k !== array_key_last($val["where"])) {
              $query .= " AND ";
            }
          }
        }
      }

      $stmt = mysqli_prepare($mysqli, $query.";");
    }

    return $row;
  }
?>