// ==UserScript==
// @name         Breizh autoplay
// @namespace    http://tampermonkey.net/
// @version      2024-04-10
// @description  Add an audio player for audio files on fichiers.breizh.pm
// @author       Eldeberen
// @match        https://fichiers.breizh.pm/*
// @grant        none
// ==/UserScript==


// Add current song to history
function ap_add2history(event) {
  ap_history.push(event.target);
}

// Play the next track
function ap_next(event) {
  let item = ap_history.at(-1);
  let autoplay = document.getElementById("ap-player").open;
  let random = document.getElementById("ap-random").checked;
  let loop = document.getElementById("ap-loop").checked;
  let currentId = ap_medias.indexOf(item);
  let nextId = -1;

  // If no autoplay, exit
  if(!autoplay) return;

  // If function applied to something that is not an audio song, exit
  // Note that this should not happen in a regular use
  if(currentId == -1) return;

  // Make sure to pause the current track
  item.pause();

  // If random, pick a random song in the list
  // Else pick the next one
  if(random) {
    nextId = Math.floor(Math.random() * ap_medias.length);
  } else {
    nextId = currentId + 1;
  }

  // If looping, stay in the range
  if(loop) {
    nextId %= ap_medias.length;
  }

  // If the next song is out, exit
  if(nextId == ap_medias.length) return;

  // Finally, set the volume back and jump to the selected song
  ap_medias[nextId].volume = item.volume;
  ap_medias[nextId].play();
}

// Play/pause current
function ap_playpause() {
  if(ap_paused == null) {
    ap_paused = ap_history.pop();
    ap_paused.pause();
  } else {
    ap_paused.play();
    ap_paused = null;
  }
}

// Play previous song
function ap_prev() {
  let current = ap_history.pop();
  let prev = ap_history.pop();
  current.pause();
  prev.currentTime = 0;
  prev.play();
}
// Get all audio medias on the page
let ap_medias = Array.from(document.querySelectorAll("audio"));

// Define a playing history
let ap_history = [];
let ap_paused = null;

// If there is at least one media
if(ap_medias.length > 0) {
  // Create the menu
  var ap_menu = document.createElement("div");
  ap_menu.id = "ap-manu";
  ap_menu.innerHTML = `<details id="ap-player">
      <summary>Player</summary>
      <button id="ap-prev">⏮</button>
      <button id="ap-playpause">⏯</button>
      <button id="ap-next">⏭</button>
      <label for="ap-random">Aléatoire</label><input type="checkbox" id="ap-random" />
      <label for="ap-loop">Boucle</label><input type="checkbox" id="ap-loop" />
    </details>`;
  document.querySelector("body").insertBefore(ap_menu, document.getElementById("maintable"));

  // Add event listeners
  [["ap-prev", ap_prev],
   ["ap-playpause", ap_playpause],
   ["ap-next", ap_next]].map((e) => {
      document.getElementById(e[0]).addEventListener("click", e[1]);
  });

  // Apply the event listener to all medias
  ap_medias.map(function(e) {
    e.addEventListener("ended", ap_next);
    e.addEventListener("play", ap_add2history);
  });
}