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import { Config, Message } from "./types.ts";
export default class Mailgun {  private basic: string;  private endpoint: string;
  constructor(config: Config) {    const base64 = btoa(`api:${config.key}`);
    this.basic = `Basic ${base64}`;    this.endpoint =      typeof config.region !== "undefined" && config.region === "eu"        ? `https://api.eu.mailgun.net/v3/${config.domain}/messages`        : `https://api.mailgun.net/v3/${config.domain}/messages`;  }
  send(message: Message) {    const form = new FormData();
    // For package simplicity we'll parse the reply property into the correct header    if (message["reply"]) {      message["h:Reply-To"] = message.reply;
      delete message["reply"];    }
    for (const property in message) {      if (Object.prototype.hasOwnProperty.call(message, property)) {        const key = property as keyof Message;        const value = message[key];
        this.mailgunStringify(key, value, form);      }    }
    const method = "POST";    const headers = { Authorization: this.basic };
    return fetch(this.endpoint, { method, headers, body: form });  }
  private mailgunStringify(    key: keyof Message,    value: Message[keyof Message],    form: FormData,  ): void {    // Return early if the value is undefined    if (value === undefined) {      return;    }
    // Handle single file    if (value instanceof File) {      form.append(key, value);
      return;    }
    // Handle array of files    const isArray = Array.isArray(value);    const isFiles = isArray && value.every((item) => item instanceof File);
    if (isFiles) {      value.forEach((file, index) => {        form.append(`${key}[${index}]`, file);      });
      return;    }
    // Handle array of strings    if (Array.isArray(value)) {      const parsedValue = value.join(",");
      form.append(key, parsedValue);
      return;    }
    // For all other types (boolean, string), convert to string and append    const valueStringified = value.toString();
    form.append(key, valueStringified);  }}