import { Database } from "bun:sqlite";
import type { TEvent } from "./event.types";
import { transformArray } from "../../util";

const BASE_URL = "https://77th-jsoc.com/service.php?action=get_events";

export type TEventEntity = TEvent & {
  event_uid: number
  notification: "new" | "changed" | "deleted" | "done"
}

export type TEventEntityNew = Omit<TEventEntity, "event_uid">

export class Event implements TEventEntity {
  static table_name: "events"
  static createTable (db: Database): void {
    const query = db.query(`CREATE TABLE IF NOT EXISTS events (
      event_uid INTEGER PRIMARY KEY,
      uid TEXT NOT NULL UNIQUE,
      title TEXT NOT NULL,
      date_at DATETIME NOT NULL,
      time_start TEXT NOT NULL,
      time_end TEXT NOT NULL,
      posted_by TEXT NOT NULL,
      location TEXT NOT NULL,
      event_type TEXT NOT NULL,
      link TEXT NOT NULL,
      description TEXT NOT NULL,
      timezone TEXT NOT NULL,
      notification TEXT NOT NULL DEFAULT "new"
    );`);
    query.run(); 
  }

  static insert ( events: TEventEntityNew[], db: Database ) {
    const insert = db.prepare("INSERT OR REPLACE INTO events (uid, title, date_at, time_start, time_end, posted_by, location, event_type, link, description, timezone, notification) VALUES ($uid, $title, $date_at, $time_start, $time_end, $posted_by, $location, $event_type, $link, $description, $timezone, $notification)");
    const insertEvents = db.transaction(events => {
        for (const event of events) insert.run(event);
        return events.length;
    });

    const transforedEventArray = transformArray( events );
    const count = insertEvents(transforedEventArray);

    console.log(`Inserted ${count} events`);
  }

  static async fetch_events( _year_: number, _month_: number, timezone: number) {
    const url = `${BASE_URL}&year=${_year_}&month=${_month_}&timezone=${timezone}`
    const response = await fetch(url, {
        method: "GET",
    });
    const body = await response.json() as {events: TEvent[] };
    const events = body.events.sort( ( a, b ) => ( new Date(a.date_at) < new Date(b.date_at ) ) ? -1 : 1 );
    return events;
  }

  static get_events (notification: TEventEntity["notification"][] | null, db: Database ) {
    const whereConditions: string[] = [];
    if ( notification ) {
        whereConditions.push( `notification IN ('${ notification.join("', '") }')` )
    }
    const where = ( () => {
      let str = "WHERE ";
      if ( whereConditions.length >= 1 ) {
          str += whereConditions.join(" AND ");
      }
      return str;
    })()
    const query = db.query(`SELECT * FROM events${ where ? ( " " + where ) : ""};`).as(Event);
    return query.all(); 
  }

  event_uid: number;
  uid: string;
  title: string;
  description: string;
  date_at: string;
  time_start: string;
  time_end: string;
  posted_by: string;
  location: string;
  event_type: TEventEntity["event_type"];
  timezone: string;
  link: string;
  notification: TEventEntity["notification"]

  constructor(event_uid: number, uid: string, title: string, description: string, date_at: string, time_start: string, time_end: string, posted_by: string, location: string, event_type: TEventEntity["event_type"], timezone: string, link: string, notification: TEventEntity["notification"]) {
    this.event_uid = event_uid;
    this.uid = uid;
    this.title = title;
    this.description = description;
    this.date_at = date_at;
    this.time_start = time_start;
    this.time_end = time_end;
    this.posted_by = posted_by;
    this.location = location;
    this.event_type = event_type;
    this.timezone = timezone;
    this.link = link;
    this.notification = notification;
  }
  syncWithDb ( db: Database ) {
    const query = db.prepare( `SELECT * FROM ${Event.table_name} WHERE event_uid = $event_uid;`).as(Event);
    const entity = query.get({$event_uid: this.event_uid });
    if ( ! entity ) { throw new Error(`Could not find Event with event_uid ${this.event_uid} in DB!`); }
    this.uid = entity.uid;
    this.title = entity.title;
    this.description = entity.description;
    this.date_at = entity.date_at;
    this.time_start = entity.time_start;
    this.time_end = entity.time_end;
    this.posted_by = entity.posted_by;
    this.location = entity.location;
    this.event_type = entity.event_type;
    this.timezone = entity.timezone;
    this.link = entity.link;
    this.notification = entity.notification;
    return this;
  }

  set_notification ( newValue: TEventEntity["notification"], db: Database ) {
    const query = db.prepare(
        `UPDATE events
        SET notification = $notification
        WHERE event_uid = $event_uid;`
    );
    query.get({$notification: newValue, $event_uid: this.event_uid });
  }
}