import * as plugins from './smartmail.plugins.js';
import { Smartmail } from './smartmail.classes.smartmail.js';
import {
  type IWireMessage,
  type IMailSendRequest,
  type IMailSendResponse,
  type IMailboxListRequest,
  type IMailboxListResponse,
  type IMailFetchRequest,
  type IMailFetchResponse,
  type IMailStatusRequest,
  type IMailStatusResponse,
  type ISettingsUpdateRequest,
  type ISettingsUpdateResponse,
  type IWireSettings,
  createMessageId,
  createTimestamp,
} from './smartmail.wire.js';

/**
 * Options for configuring a WireTarget
 */
export interface IWireTargetOptions {
  /** URL of the SMTP service endpoint */
  endpoint: string;
  /** Optional authentication token */
  authToken?: string;
}

/**
 * WireTarget is used by the SaaS service to communicate with the SMTP service.
 * It provides methods for sending emails, updating settings, and managing mailboxes.
 */
export class WireTarget {
  private endpoint: string;
  private authToken?: string;

  constructor(options: IWireTargetOptions) {
    this.endpoint = options.endpoint;
    this.authToken = options.authToken;
  }

  /**
   * Send an email through this target
   * @param email The Smartmail instance to send
   * @returns Promise resolving to the send response
   */
  public async sendEmail(email: Smartmail<any>): Promise<IMailSendResponse> {
    const request: IMailSendRequest = {
      type: 'mail.send',
      messageId: createMessageId(),
      timestamp: createTimestamp(),
      email: email.toObject(),
    };
    return this.send<IMailSendResponse>(request);
  }

  /**
   * Update settings on the target (SMTP config, etc.)
   * Settings are extensible - any key-value pairs can be sent
   * @param settings The settings to update
   * @returns Promise resolving to the update response
   */
  public async updateSettings(settings: IWireSettings): Promise<ISettingsUpdateResponse> {
    const request: ISettingsUpdateRequest = {
      type: 'settings.update',
      messageId: createMessageId(),
      timestamp: createTimestamp(),
      settings,
    };
    return this.send<ISettingsUpdateResponse>(request);
  }

  /**
   * List emails in a mailbox
   * @param mailbox The mailbox to list (e.g., 'INBOX', 'Sent')
   * @param options Optional limit and offset for pagination
   * @returns Promise resolving to the mailbox list response
   */
  public async listMailbox(
    mailbox: string,
    options?: { limit?: number; offset?: number }
  ): Promise<IMailboxListResponse> {
    const request: IMailboxListRequest = {
      type: 'mailbox.list',
      messageId: createMessageId(),
      timestamp: createTimestamp(),
      mailbox,
      limit: options?.limit,
      offset: options?.offset,
    };
    return this.send<IMailboxListResponse>(request);
  }

  /**
   * Fetch a specific email from a mailbox
   * @param mailbox The mailbox containing the email
   * @param emailId The ID of the email to fetch
   * @returns Promise resolving to the Smartmail or null if not found
   */
  public async fetchEmail(mailbox: string, emailId: string): Promise<Smartmail<any> | null> {
    const request: IMailFetchRequest = {
      type: 'mail.fetch',
      messageId: createMessageId(),
      timestamp: createTimestamp(),
      mailbox,
      emailId,
    };
    const response = await this.send<IMailFetchResponse>(request);
    if (response.email) {
      return Smartmail.fromObject(response.email);
    }
    return null;
  }

  /**
   * Check delivery status of a sent email
   * @param deliveryId The delivery ID returned from sendEmail
   * @returns Promise resolving to the status response
   */
  public async getStatus(deliveryId: string): Promise<IMailStatusResponse> {
    const request: IMailStatusRequest = {
      type: 'mail.status',
      messageId: createMessageId(),
      timestamp: createTimestamp(),
      deliveryId,
    };
    return this.send<IMailStatusResponse>(request);
  }

  /**
   * Sends a wire message to the endpoint
   * @param message The message to send
   * @returns Promise resolving to the response
   */
  private async send<T extends IWireMessage>(message: IWireMessage): Promise<T> {
    let request = plugins.SmartRequest.create()
      .url(this.endpoint)
      .header('Content-Type', 'application/json');

    if (this.authToken) {
      request = request.header('Authorization', `Bearer ${this.authToken}`);
    }

    const response = await request.json(message).post();
    const responseData = await response.json();

    return responseData as T;
  }
}