// SPDX-FileCopyrightText: 2023 Aravinth Manivannan <realaravinth@batsense.net>
//
// SPDX-License-Identifier: AGPL-3.0-or-later

import Auth from "./auth";
import User from "./spec/user";
import Notification from "./spec/notification";
import Issue from "./spec/issue";
import Repository from "./spec/repository";
import Comment from "./spec/comments";

class Forgejo {
  url: URL;
  username: string;
  token?: Auth;
  /**
   * Represents a Forgejo instance.
   * @constructor
   * @param {string} url - The URL of the Forgejo instance
   */
  constructor(url: string) {
    this.url = new URL(url);
  }

  /**
   * Authenticate with token
   * @param {Auth} token - access token
   */
  async setTokenAuth(token: string) {
    this.token = new Auth(token);
    let res = await this.getUser();
    this.username = res.username;
  }

  /**
   * Get access token
   */
  getTokenAuth(): Auth {
    if (this.token) {
      return this.token;
    } else {
      throw new Error("set authentication token before use");
    }
  }

  /**
   * Get access token in header format for the fetch API
   */
  getTokenAuthHeader() {
    return { Authorization: `token ${this.getTokenAuth().getToken()}` };
  }

  /**
   * Get logged in user
   */
  async getUser(): Promise<User> {
    this.url.pathname = "/api/v1/user";
    let res = await fetch(this.url, {
      method: "GET",
      credentials: "omit",
      headers: this.getTokenAuthHeader(),
    });
    return await res.json();
  }

  /**
   * Get all notifications
   */
  async getNotifications(): Promise<Array<Notification>> {
    this.url.pathname = "/api/v1/notifications";
    this.url.pathname = "/api/v1/notifications";
    console.log(this.url);
    let res = await fetch(this.url, {
      method: "GET",
      credentials: "omit",
      headers: this.getTokenAuthHeader(),
    });

    return await res.json();
  }
  /**
   * Get number of unread notifications
   */
  async getNumUnreadNotifications(): Promise<number> {
    this.url.pathname = "/api/v1/notifications/new";
    let res = await fetch(this.url, {
      method: "GET",
      credentials: "omit",
      headers: this.getTokenAuthHeader(),
    });

    let data = await res.json();
    return data["new"];
  }

  /**
   * Get Notification Thread
   * @param {number} id - The ID of a notification thread
   */
  async getNotificationThread(id: number): Promise<Notification> {
    this.url.pathname = `/api/v1/notifications/threads/${id}`;
    let res = await fetch(this.url, {
      method: "GET",
      credentials: "omit",
      headers: this.getTokenAuthHeader(),
    });
    return await res.json();
  }

  /**
   * Get the time at which the issue was last read
   */
  lastReadTime(issue: Issue): Date {
    return new Date("01/01/01"); // TODO: return last read time from storage. If unread, return 0
  }

  /**
   * Check if logged in user is mentioned in the issue
   */
  async findMentionsInIssue(owner: string, repo: string, id: number) {
    let issue = await this.getIssue(owner, repo, id);
    issue = await this.getCommentsForIssue(issue);
    let unreadTime = this.lastReadTime(issue);

    const mentionUtil = (str: string): boolean => {
      return str.includes(this.username);
    };

    const items = [];

    if (new Date(issue.created_at) > unreadTime) {
      items.push(issue.title);
      items.push(issue.body);
    }

    issue.lazy_comments_data.forEach((comment) => {
      if (comment.created_at > unreadTime) {
        items.push(comment.body);
        return;
      }
      if (comment.updated_at) {
        if (comment.updated_at > unreadTime) {
          items.push(comment.body);
          return;
        }
      }
    });

    let mention = false;
    items.forEach((item) => {
      if (mentionUtil(item)) {
        mention = true;
        return;
      }
    });
    return mention;
  }

  /**
   * Mark Notification Read
   * @param {number} id - The ID of a notification thread
   */
  async markNotificationRead(id: number) {
    this.url.pathname = `/api/v1/notifications/threads/${id}`;
    await fetch(this.url, { method: "PATCH" });
  }

  /**
   * Mark Notification Read for a specific repository
   * @param {string} owner - Name of the owner of the repository
   * @param {string} repo - Name of the repository
   */
  async markNotificationReadForRepo(owner: string, repo: string) {
    this.url.pathname = `/api/v1/repos/${owner}/${repo}/notifications`;
    await fetch(this.url, { method: "PUT" });
  }

  /**
   * Get Issue and its comments
   * @param {str} owner - The owner of the repository
   * @param {str} repo - The name of the repository
   * @param {number} id - The ID of an issue
   */
  async getIssue(owner: string, repo: string, id: number): Promise<Issue> {
    this.url.pathname = `/api/v1/repos/${owner}/${repo}/issues/${id}`;
    let res = await fetch(this.url, {
      method: "GET",
      credentials: "omit",
      headers: this.getTokenAuthHeader(),
    });
    let issue = await res.json();

    if (typeof issue.created_at === "string") {
      issue.created_at = new Date(issue.created_at);
    }

    if (issue.updated_at) {
      if (typeof issue.updated_at === "string") {
        issue.updated_at = new Date(issue.updated_at);
      }
    }

    if (issue.closed_at) {
      if (typeof issue.closed_at === "string") {
        issue.closed_at = new Date(issue.closed_at);
      }
    }

    return issue;
  }

  /**
   * Fetch and save comments for the issue objects
   */
  async getCommentsForIssue(issue: Issue): Promise<Issue> {
    // TODO: check if issue.number != issue.id causes problems. I'm assuming
    // Issue.number is the local repository issue ID and issue.id is DB ID
    this.url.pathname = `/api/v1/repos/${issue.repository.owner}/${issue.repository.name}/issues/${issue.number}/comments`;
    let res = await fetch(this.url, {
      method: "GET",
      credentials: "omit",
      headers: this.getTokenAuthHeader(),
    });
    let c: Array<Comment> = await res.json();

    c = c.map((comment) => {
      if (typeof comment.created_at === "string") {
        comment.created_at = new Date(comment.created_at);
      }

      if (comment.updated_at) {
        if (typeof comment.updated_at === "string") {
          comment.updated_at = new Date(comment.updated_at);
        }
      }
      return comment;
    });

    issue.lazy_comments_data = c;

    return issue;
  }
}

export default Forgejo;
//export { Notification, Issue, Repository, Comment, User };