"use strict";

//
// Voicegardens front-end Javascript
//

// URL which exposes the archive saving API end-point
var archiveUrl = window.location + "add-to-archive";

// The x,y coordinates which gives the center of the canvas
var centerX;
var centerY;

// The canvas frame rate which controls how many times the draw function is
// called. So far as we have seen, this can affect performance. Try the value
// of 30 and also 60 to see the difference. Higher values may also give more
// fun animation effects.
var frameRate = 30;

// Sound recording API objects
var microphone;
var recorder;
var recording;

// Boolean which is only true when the user stops the recording of a sound.
// This then triggers the generation of a shape based on that recording.
var newSoundJustRecorded = false;

// All user clickable buttons
var playButton;
var recordButton;
var stopButton;
var chorusButton;

// Time-out used to stop a recording in case the user forgets to stop it
// themselves. It also gurantees to turn off the mic in case of some unknown
// error that we didn't take into consideration. This is 30 seconds in
// milliseconds.
var recordingTimeout = 30000;

// The x,y coordinates which shows where the window position is. This is useful
// because we use the `translate` function to offset the window view in
// relation to the canvas (users can drag their view across the "environment")
// and we need to record where that x position  leaves us.
var screenX = 0;
var screenY = 0;
var toScreenX = 0;
var toScreenY = 0;

// All shapes generated
var shapes = [];

// Sound properties
var amplitude;
var duration;

// random shape positioning
var positionTick = false;
var timer = 0;

function record() {
  /**
   * Start recording a sound.
   **/
  if (microphone.enabled) {
    setTimeout(recorder.record(recording), recordingTimeout);
  }
}

function stop() {
  /**
   * Stop recording a new sound.
   **/
  if (recorder.recording) {
    recorder.stop();

    // signal to the draw loop that we should generate a new shape
    newSoundJustRecorded = true;

    // https://p5js.org/reference/#/p5.SoundFile/getPeaks
    amplitude = recording.getPeaks(1)[0] * 100;

    // https://p5js.org/reference/#/p5.SoundFile/duration
    duration = recording.duration();

    // automatically archive this sound to the back-end
    sendToArchive();
  }
}

function play() {
  /**
   * Play the sound just recorded.
   **/
  if (recording.isLoaded()) {
    recording.play();
  }
}

function sendToArchive() {
  /**
   * Send the sound to the back-end for archiving.
   **/
  var soundBlob = recording.getBlob();

  var formData = new FormData();
  var date = new Date();
  var filename = date.getTime().toString() + ".wav";
  formData.append("file", soundBlob, filename);

  var config = new Headers({ "Content-Type": "multipart/form-data" });

  axios.post(archiveUrl, formData, config).catch(function(error) {
    console.log(
      "Upload failed!",
      "Received the following message:",
      error.response.data
    );
  });
}

function setupRecording() {
  /**
   * Setup logic for sound recording.
   **/
  microphone = new p5.AudioIn();
  microphone.start();

  recorder = new p5.SoundRecorder();
  recorder.setInput(microphone);

  recording = new p5.SoundFile();

  recordButton = createImg("../static/images/RECORD-COLOR.png");
  recordButton.position(10, 5);
  recordButton.mousePressed(record);

  stopButton = createImg("../static/images/STOP-BW.png");
  stopButton.position(10, 40);
  stopButton.mousePressed(stop);

  playButton = createImg("../static/images/PLAY-BW.png");
  playButton.position(10, 75);
  playButton.mousePressed(play);

  chorusButton = createImg("../static/images/CHORUS-BW.png");
  chorusButton.position(10, 110);
}

class GeneratedShape {
  constructor() {
    /**
     * Initialise the new shape.
     **/

    // The opacity of the shape. This controls whether we can see the shape or
    // not (transparency). It starts at zero as we want to fade the shapes in
    // when they enter the environment
    this.opacity = 0;

    // the colour of the shape
    this.colour = this.chooseColour();

    // Acceleration x,y values which control at which speed the shape
    // accelerates towards the intended x,y destination.
    this.accelX = 0.0;
    this.accelY = 0.0;

    // The x, y destination values which the shape moves towards. This can be
    // calculated against the `mouseX` and `mouseY` values, for example. Then
    // the shape will follow the mouse.
    this.deltaX = 0.0;
    this.deltaY = 0.0;

    // The speed at which the shape 'springs' towards its final destination.
    this.springing = 0.0009;

    // The speed at which the shape rocks back and forth when it is in the
    // process of coming to a halt.
    this.damping = 0.98;

    // Value that controls the tightness or looseness of the curves between the
    // x,y values of the shape. AFAIK, this value can go between -5 and +5.
    // With +5 we have very sharp curves and edges.
    this.organicConstant = random(-5, 5);

    // The x,y values which determine where the shape is currently. These are
    // required in order to calculate where the shape is currently so that we
    // can then go about moving it to the new destination.
    this.startXs = [];
    this.startYs = [];

    // The x,y values which track the new position of the shape (and therefore
    // update the `startXs` and `startYs`) as the shape moves about the
    // environment
    this.xs = [];
    this.ys = [];

    // vector listing of the above xs, ys so that we can pass these lists to
    // the collidePolyPoly function for collision detection which expects
    // vector objects, not plain x, y coordinates as in xs, ys.
    this.vectors = [];

    // Angles between xs and ys.
    this.angles = [];

    // Curve movement wobble frequencies.
    this.frequencies = [];

    // Random x,y values (only randomly chosen once, then fixed) which are used
    // in the calculation of the curve drawing between the x,y vectors of the
    // shape
    this.randXs = [];
    this.randYs = [];

    // Number of edges of the shape
    this.edges = amplitude + 3;

    // The distance between the xs and ys influencing the size of the shape.
    // The randomXs, randomYs also influence the shape size as they are added
    // when drawing the space between xs and ys.
    this.radius = ceil(duration * 40);

    // ???
    this.angle = radians(360 / this.edges);

    // ???
    this.centerX = random(windowWidth);
    this.centerY = random(windowHeight);

    // new destination for the shapes
    this.destX = random(windowWidth);
    this.destY = random(windowHeight);

    // the sound recording attached to this shape
    this.recording;

    // the shape that was last collided with
    this.lastCollidedShape;

    this.initialise();
  }

  initialise() {
    /**
     * Initialise the shape values.
     **/
    for (let i = 0; i < this.edges; i++) {
      this.startXs[i] = 0;
      this.startYs[i] = 0;
      this.xs[i] = 0;
      this.ys[i] = 0;
      this.vectors[i] = createVector(this.xs[i], this.ys[i]);
      this.angles[i] = 0;

      // this directly influences the shape of the size alongside the
      // this.radius shape value
      this.randXs[i] = ceil(duration * random(-30, 30));
      this.randYs[i] = ceil(duration * random(-30, 30));
    }

    for (let i = 0; i < this.edges; i++) {
      this.frequencies[i] = random(5, 12);
    }
  }

  collide(shapes) {
    /**
     * Detect if the shape collides with another shape. Returns a tuple of type
     * [bool, shape] where bool = if there was a collision and shape = the
     * collided shape.
     **/
    if (shapes.length === 1) {
      return [false, undefined];
    }

    for (let i = 0; i < shapes.length; i++) {
      let shape = shapes[i];

      if (this === shape || this.lastCollidedShape === shape) {
        continue;
      }

      // don't detect if one shape is fully inside another
      let interiorCollision = false;

      var collision = collidePolyPoly(
        this.vectors,
        shape.vectors,
        interiorCollision
      );

      if (collision === true) {
        this.lastCollidedShape = shape;
        return [true, shape];
      }
    }

    return [false, undefined];
  }

  sound() {
    /**
     * Play a sound after a collision is detected.
     **/
    if (this.recording.isLoaded()) {
      this.recording.play();
    }
  }

  docolour() {
    /**
     * Draw colour and fade-in shape.
     **/
    if (this.opacity != 256) {
      if (this.opacity < 256) {
        // shape should fade in, so increment alpha value
        let currentAlpha = this.colour._getAlpha();
        this.colour.setAlpha(currentAlpha + random(0, 3));
      } else {
        // shape has faded-in, show it as fully visible now
        this.opacity = 256;
      }
    }
    fill(this.colour);
  }

  chooseColour() {
    /**
     * Choose a colour for the shape.
     **/
    // TODO: choose nicer colours
    // TODO: Can we have gradient colours
    // TODO: Can we have multiple colours
    let colourChoices = [
      color("red"),
      color("blue"),
      color("green"),
      color("black")
    ];

    let index = floor(random(0, colourChoices.length));
    let chosenColour = colourChoices[index];

    // set shape opacity to 0 initially to enable fade-in
    chosenColour.setAlpha(this.opacity);

    return chosenColour;
  }

  curve() {
    /**
     * Curve the shape.
     **/
    curveTightness(this.organicConstant);
    beginShape();
    for (let i = 0; i < this.edges; i++) {
      curveVertex(this.xs[i], this.ys[i]);
    }
    endShape(CLOSE);
  }

  draw() {
    /**
     * Draw the shape vectors.
     **/
    this.docolour();

    // set the start x,y positions for the shape on each draw loop
    for (let i = 0; i < this.edges; i++) {
      this.startXs[i] =
        this.centerX + cos(this.angle * i) * this.radius + this.randXs[i];
      this.startYs[i] =
        this.centerY + sin(this.angle * i) * this.radius + this.randYs[i];
    }

    this.curve();
  }

  move() {
    /**
     * Move the shape vectors.
     **/
    this.deltaX = this.destX - this.centerX - toScreenX;
    this.deltaY = this.destY - this.centerY - toScreenY;

    this.deltaX *= this.springing;
    this.deltaY *= this.springing;

    this.accelX += this.deltaX;
    this.accelY += this.deltaY;

    this.centerX += this.accelX;
    this.centerY += this.accelY;

    this.accelX *= this.damping;
    this.accelY *= this.damping;

    this.organicConstant = 1 - (abs(this.accelX) + abs(this.accelY)) * 0.1;

    for (let i = 0; i < this.edges; i++) {
      this.xs[i] =
        this.startXs[i] + sin(radians(this.angles[i])) * (this.accelX * 2);
      this.ys[i] =
        this.startYs[i] + sin(radians(this.angles[i])) * (this.accelY * 2);
      this.vectors[i] = createVector(this.xs[i], this.ys[i]);
      this.angles[i] += this.frequencies[i];
    }
  }
}

function setup() {
  /**
   * The initial setup function called once on start.
   **/
  createCanvas(windowWidth, windowHeight);
  frameRate(frameRate);
  setupRecording();
}

function draw() {
  /**
   * The draw loop which is called x times a second where x is the frameRate.
   **/
  background("white");
  blendMode(BLEND);
  smooth();
  noStroke();

  // count random waiting times in seconds until choosing a new destX, destY
  // for a moving shape
  let nextPositionTick = random(3000, 8000);
  let tickingTime = millis();
  if (tickingTime >= nextPositionTick + timer) {
    positionTick = true;
    timer = millis();
  }

  // offset the window view based on new values of x,y related to the screen.
  // These values are generated once the user drags the screen with the mouse.
  screenX = lerp(screenX, toScreenX, 0.2);
  screenY = lerp(screenY, toScreenY, 0.2);
  translate(screenX, screenY);

  // generate a new shape after a sound recording
  if (newSoundJustRecorded === true) {
    let newShape = new GeneratedShape();
    newShape.recording = recording;
    shapes.push(newShape);
    newSoundJustRecorded = false;
  }

  for (let i = 0; i < shapes.length; i++) {
    let shape = shapes[i];

    // randomly move the shapes
    if (positionTick) {
      shape.destX = random(windowWidth);
      shape.destY = random(windowHeight);

      // also reset last collided shape
      shape.lastCollidedShape = undefined;
    }

    shape.draw();
    shape.move();

    // play recordings when shapes collide
    let [collision, collidedShape] = shape.collide(shapes);
    if (collision === true) {
      shape.sound();
      collidedShape.sound();
    }
  }

  // reset random shape position time ticker
  positionTick = false;
}

function mouseDragged() {
  /**
   * Mouse drag movement handling.
   **/
  toScreenX += mouseX - pmouseX;
  toScreenY += mouseY - pmouseY;
}

function windowResized() {
  /**
   * Canvas re-draw handling.
   **/
  resizeCanvas(windowWidth, windowHeight);
}