/* eslint-disable @typescript-eslint/naming-convention */
import Papa, { ParseResult } from "papaparse";

export type CSVType = {
  name: string | null;
  email: string | null;
  role: number | null;
  author_id: string | null;
  auto_renew: number | null;
  notification: number;
  encryption: number | null;
  encryption_password: string | null;
  prompt: number | null;
};

// CSVTypeのプロパティ名を文字列の配列で定義する
const CSVTypeFields: (keyof CSVType)[] = [
  "name",
  "email",
  "role",
  "author_id",
  "auto_renew",
  "notification",
  "encryption",
  "encryption_password",
  "prompt",
];

// 2つの配列が等しいかどうかを判定する
const equals = (lhs: string[], rhs: string[]) => {
  if (lhs.length !== rhs.length) return false;
  for (let i = 0; i < lhs.length; i += 1) {
    if (lhs[i] !== rhs[i]) return false;
  }
  return true;
};

/** CSVファイルをCSVType型に変換するパーサー */
export const parseCSV = async (csvString: string): Promise<CSVType[]> =>
  new Promise((resolve, reject) => {
    Papa.parse<CSVType>(csvString, {
      download: false,
      worker: true,
      header: true,
      dynamicTyping: true,
      complete: (results: ParseResult<CSVType>) => {
        // ヘッダーがCSVTypeFieldsと一致しない場合はエラーを返す
        if (!equals(results.meta.fields ?? [], CSVTypeFields)) {
          reject(new Error("Invalid CSV format"));
        }
        resolve(results.data);
      },
      error: (error: Error) => {
        reject(error);
      },
    });
  });