const axios = require("axios");
const Song = require("../../models/song");

class PlexTracker {
  #config = null;
  #cache = [];

  constructor(config) {
    this.#config = config;
  }

  async poll(useCache = false) {
    if (!this.#config.token || !this.#config.url)
      return [];
    if (useCache)
      return this.#cache;

    const response = await axios.get(this.#config.url + "/status/sessions", {
      headers: {
        "Accept": "application/json",
        "X-Plex-Token": this.#config.token
      }
    });

    if (!response.data.MediaContainer?.Metadata) {
      this.#cache = [];
      return this.#cache;
    }

    const filtered = response.data.MediaContainer?.Metadata.filter(m => this.#filter(m));
    this.#cache = filtered.map(m => this.#transform(m));
    return this.#cache;
  }

  #filter(data) {
    if (!this.#config.filters || this.#config.filters.length == 0)
      return true;

    for (let filter of this.#config.filters) {
      if (filter.library && !filter.library.some(l => l == data.librarySectionTitle))
        continue;
      if (filter.ip && !filter.ip.some(l => l == data.address))
        continue;
      if (filter.deviceId && !filter.deviceId.some(l => l == data.machineIdentifier))
        continue;
      if (filter.platform && !filter.platform.some(l => l == data.Player.platform))
        continue;
      if (filter.product && !filter.product.some(l => l == data.Player.product))
        continue;
      return true;
    }
    return false;
  }

  #transform(data) {
    const id = data.guid.substring(data.guid.lastIndexOf('/') + 1);
    return new Song(id, data.title, data.parentTitle, data.grandparentTitle, data.parentYear, data.duration, data.viewOffset, data.sessionKey, data.Player.state, "plex");
  }
}

module.exports = PlexTracker;