import * as plugins from './mailgun.plugins.js';
import * as interfaces from './interfaces/index.js';

export interface IMailgunAccountContructorOptions {
  apiToken: string;
  region: 'eu' | 'us';
}

export class MailgunAccount {
  public apiBaseUrl: string;

  public options: IMailgunAccountContructorOptions;

  public smartSmtps: { [domain: string]: plugins.smartsmtp.Smartsmtp } = {};

  constructor(optionsArg: IMailgunAccountContructorOptions) {
    this.options = optionsArg;
    this.apiBaseUrl =
      this.options.region === 'eu'
        ? 'https://api.eu.mailgun.net/v3'
        : 'https://api..mailgun.net/v3';
  }

  /**
   * allows adding smtp credentials
   * Format: [domain]|[username]|[password]
   */
  public async addSmtpCredentials(credentials: string) {
    const credentialArray = credentials.split('|');
    if (credentialArray.length !== 3) {
      throw new Error('credentials are in the wrong format');
    }
    this.smartSmtps[credentialArray[0]] =
      await plugins.smartsmtp.Smartsmtp.createSmartsmtpWithRelay({
        smtpServer: 'smtp.eu.mailgun.org',
        smtpUser: credentialArray[1],
        smtpPassword: credentialArray[2],
      });
  }

  public async getRequest(routeArg: string, binaryArg: boolean = false) {
    let requestUrl = routeArg;
    const needsBaseUrlPrefix = !routeArg.startsWith('https://');
    if (needsBaseUrlPrefix) {
      requestUrl = `${this.apiBaseUrl}${routeArg}`;
    }
    console.log(requestUrl);
    const requestOptions: plugins.smartrequest.ISmartRequestOptions = {
      method: 'GET',
      headers: {
        Authorization: `Basic ${plugins.smartstring.base64.encode(`api:${this.options.apiToken}`)}`,
        'Content-Type': 'application/json',
      },
      keepAlive: false,
    };
    let response: plugins.smartrequest.IExtendedIncomingMessage;
    if (!binaryArg) {
      response = await plugins.smartrequest.request(requestUrl, requestOptions);
    } else {
      response = await plugins.smartrequest.getBinary(requestUrl, requestOptions);
    }
    return response;
  }

  public async postFormData(routeArg: string, formFields: plugins.smartrequest.IFormField[]) {
    const requestUrl = `${this.apiBaseUrl}${routeArg}`;
    console.log(requestUrl);
    const response = await plugins.smartrequest.postFormData(
      requestUrl,
      {
        headers: {
          Authorization: `Basic ${plugins.smartstring.base64.encode(
            `api:${this.options.apiToken}`
          )}`,
        },
        keepAlive: false,
      },
      formFields
    );
    return response;
  }

  /**
   * sends a SmartMail
   */
  public async sendSmartMail(
    smartmailArg: plugins.smartmail.Smartmail<interfaces.IMailgunMessage>,
    toArg: string,
    dataArg = {}
  ) {
    const domain = smartmailArg.options.from.split('@')[1].replace('>', '');
    const formFields: plugins.smartrequest.IFormField[] = [
      {
        name: 'from',
        type: 'string',
        payload: smartmailArg.options.from,
      },
      {
        name: 'to',
        type: 'string',
        payload: toArg,
      },
      {
        name: 'subject',
        type: 'string',
        payload: smartmailArg.getSubject(dataArg),
      },
      {
        name: 'html',
        type: 'string',
        payload: smartmailArg.getBody(dataArg),
      },
    ];

    console.log(smartmailArg.attachments);

    for (const attachment of smartmailArg.attachments) {
      formFields.push({
        name: 'attachment',
        type: 'Buffer',
        payload: attachment.contentBuffer,
        fileName: attachment.parsedPath.base,
      });
    }

    if (smartmailArg.getBody(dataArg)) {
      console.log('All requirements for API met');
      const response = await this.postFormData(`/${domain}/messages`, formFields);
      if (response.statusCode === 200) {
        console.log(
          `Sent mail with subject ${smartmailArg.getSubject(
            dataArg
          )} to ${toArg} using the mailgun API`
        );
        return response.body;
      } else {
        console.log(response.body);
        throw new Error('could not send email');
      }
    } else {
      console.log(
        'An empty body was provided. This does not work via the API, but using SMTP instead.'
      );
      const wantedSmartsmtp = this.smartSmtps[domain];
      if (!wantedSmartsmtp) {
        console.log('did not find appropriate smtp credentials');
        return;
      }
      await wantedSmartsmtp.sendSmartMail(smartmailArg, toArg);
      console.log(
        `Sent mail with subject "${smartmailArg.getSubject(
          dataArg
        )}" to "${toArg}" using an smtp transport over Mailgun.`
      );
    }
  }

  public async retrieveSmartMailFromMessageUrl(messageUrlArg: string) {
    console.log(`retrieving message for ${messageUrlArg}`);
    const response = await this.getRequest(messageUrlArg);
    if (response.statusCode === 404) {
      console.log(response.body.message);
      return null;
    }
    const responseBody: interfaces.IMailgunMessage = response.body;
    const smartmail = new plugins.smartmail.Smartmail<interfaces.IMailgunMessage>({
      from: responseBody.From,
      body: responseBody['body-html'],
      subject: responseBody.Subject,
      creationObjectRef: responseBody,
    });

    // lets care about attachments
    if (responseBody.attachments && responseBody.attachments instanceof Array) {
      for (const attachmentInfo of responseBody.attachments) {
        const attachmentName = attachmentInfo.name;
        const attachmentContents = await this.getRequest(attachmentInfo.url, true);
        smartmail.addAttachment(
          new plugins.smartfile.Smartfile({
            path: `./${attachmentName}`,
            base: `./${attachmentName}`,
            contentBuffer: attachmentContents.body,
          })
        );
      }
    }

    return smartmail;
  }

  public async retrieveSmartMailFromNotifyPayload(notifyPayloadArg: any) {
    return await this.retrieveSmartMailFromMessageUrl(notifyPayloadArg['message-url']);
  }
}