// 3rd party.
import React from 'react';
import ReactDOM from 'react-dom';
// 2nd party.
import {create as createClient} from '@avocado/client/socket';
import {EntityList} from '@avocado/entity';
import {ActionRegistry} from '@avocado/input';
import {Stage} from '@avocado/graphics';
import {Vector} from '@avocado/math';
import {SocketIoParser} from '@avocado/packet';
import {Synchronizer, Unpacker} from '@avocado/state';
import {Room, RoomView} from '@avocado/topdown';
import {World} from '@avocado/physics/matter/world';
import {clearAnimation, setAnimation, Ticker} from '@avocado/timing';
// 1st party.
import {InputPacket, KeysPacket, StatePacket} from '../common/packet';
import {augmentParserWithThroughput} from '../common/parser-throughput';
import {WorldTime} from '../common/world-time';
import Ui from './ui';
// DOM.
const appNode = document.querySelector('.app');
// Lol Apple
appNode.addEventListener('touchmove', (event) => {
  event.preventDefault();
});
// Graphics stage.
const visibleSize = [320, 180];
const halfVisibleSize = Vector.scale(visibleSize, 0.5);
const visibleScale = [2, 2];
const stage = new Stage(Vector.mul(visibleSize, visibleScale));
stage.scale = visibleScale;
let isFocused = false;
stage.element.addEventListener('blur', () => {
  isFocused = false;
});
stage.element.addEventListener('focus', () => {
  isFocused = true;
});
stage.addToDom(appNode);
// Handle "own" entity.
let selfEntity;
function hasSelfEntity() {
  return selfEntity && 'string' !== typeof selfEntity;
}
// Create room.
const room = new Room();
room.world = new World();
const roomView = new RoomView(room, stage.renderer);
stage.addChild(roomView);
// Time.
const worldTime = new WorldTime();
// Synchronize state.
let state = undefined;
const synchronizer = new Synchronizer({
  room,
  worldTime,
});
room.on('entityAdded', (entity) => {
  // Traits that shouldn't be on client.
  const noClientTraits = [
    'behaved',
  ];
  // If there's no physics, then remove physical trait.
  if (!room.world) {
    noClientTraits.push('physical');
  }
  // Traits that only make sense for our self entity on the client.
  const selfEntityOnlyTraits = [
    'controllable',
    'followed',
  ];
  for (const type of selfEntityOnlyTraits.concat(noClientTraits)) {
    if (entity.is(type)) {
      entity.removeTrait(type);
    }
  }
  // Set self entity.
  if ('string' === typeof selfEntity) {
    if (entity === room.findEntity(selfEntity)) {
      selfEntity = entity;
      evaluationContext.selfEntity = selfEntity;
      // Add back our self entity traits.
      for (const type of selfEntityOnlyTraits) {
        entity.addTrait(type);
      }
      const {camera} = entity;
      camera.on('realPositionChanged', () => {
        const offset = Vector.sub(halfVisibleSize, camera.realPosition);
        roomView.position = offset;
      });
      // Avoid the initial 'lerp.
      camera.realPosition = camera.position;
    }
  }
});
// Accept input.
const actionRegistry = new ActionRegistry();
actionRegistry.mapKeysToActions({
  'w': 'MoveUp',
  'a': 'MoveLeft',
  's': 'MoveDown',
  'd': 'MoveRight',
});
actionRegistry.listen(stage.element);
// Mouse/touch movement.
function createMoveToNormal(position) {
  if (!selfEntity) {
    return;
  }
  const entityPosition = selfEntity.position;
  const realEntityPosition = Vector.sub(
    entityPosition,
    Vector.sub(selfEntity.camera.realPosition, halfVisibleSize)
  );
  const magnitude = Vector.magnitude(position, realEntityPosition);
  if (magnitude < 4) {
    return;
  }
  const diff = Vector.sub(position, realEntityPosition);
  return Vector.normalize(diff);
}
let pointingAt = [-1, -1];
function isPointingAtAnything() {
  return -1 !== pointingAt[0] && -1 !== pointingAt[1];
}
stage.on('pointerDown', (event) => {
  if (event.target !== stage.ui) {
    return;
  }
  pointingAt = event.position;
});
stage.on('pointerMove', (event) => {
  if (event.target !== stage.ui) {
    return;
  }
  if (!isPointingAtAnything()) {
    return;
  }
  pointingAt = event.position;
});
stage.on('pointerUp', (event) => {
  pointingAt = [-1, -1];
});
let actionState = actionRegistry.state;
// Create the socket connection.
const AugmentedParser = augmentParserWithThroughput(SocketIoParser);
const socket = createClient(window.location.href, {
  parser: AugmentedParser,
});
// Mouse/touch movement.
const pointerMovementHandle = setInterval(() => {
  do {
    if (isPointingAtAnything()) {
      const normal = createMoveToNormal(pointingAt);
      if (normal) {
        actionRegistry.state = actionRegistry.state.set('MoveTo', normal);
        break;
      }
    }
    actionRegistry.state = actionRegistry.state.delete('MoveTo');
  } while (false);
}, 1000 / 15);
// Input messages.
const inputHandle = setInterval(() => {
  if (actionState !== actionRegistry.state) {
    actionState = actionRegistry.state;
    socket.send(new InputPacket(JSON.stringify(actionRegistry.state.toJS())));
  }
}, 1000 / 60);
// Prediction.
let mayRender = false;
const renderTicker = new Ticker(1 / 60);
renderTicker.on('tick', () => {
  mayRender = true;
});
let lastIntensity = undefined;
let lastIsFocused = undefined;
let lastTime = performance.now();
const predictionHandle = setInterval(() => {
  const now = performance.now();
  const elapsed = (now - lastTime) / 1000;
  lastTime = now;
  if (hasSelfEntity()) {
    selfEntity.inputState = actionState.toJS();
  }
  // Tick synchronized.
  synchronizer.tick(elapsed);
  state = synchronizer.state;
  // Render timing.
  renderTicker.tick(elapsed);
  // Apply environmental lighting.
  let intensity = 0;
  if (worldTime.hour >= 21 || worldTime.hour < 4) {
    intensity = 0.8;
  }
  if (worldTime.hour >= 4 && worldTime.hour < 7) {
    intensity = 0.8 * ((7 - worldTime.hour) / 3);
  }
  if (worldTime.hour >= 18 && worldTime.hour < 21) {
    intensity = 0.8 * ((3 - (21 - worldTime.hour)) / 3);
  }
  intensity = Math.floor(intensity * 1000) / 1000;
  if (intensity !== lastIntensity || isFocused !== lastIsFocused) {
    stage.removeAllFilters();
    if (!isFocused) {
      stage.paused(intensity);
    }
    else {
      stage.night(intensity);
    }
    lastIntensity = intensity;
    lastIsFocused = isFocused;
  }
}, 1000 / 60);

// State updates.
const unpacker = new Unpacker();
function onPacket(packet) {
  if (packet instanceof KeysPacket) {
    unpacker.registerKeys(packet.data);
  }
  if (packet instanceof StatePacket) {
    const patch = unpacker.unpack(packet.data);
    for (const step of patch) {
      const {op, path, value} = step;
      if ('add' === op && '/selfEntity' === path) {
        selfEntity = value;
      }
    }
    synchronizer.patchState(patch);
  }
}
socket.on('packet', onPacket);
// Render.
function render() {
  stage.tick();
  if (!mayRender) {
    return false;
  }
  mayRender = false;
  stage.render();
}
const renderHandle = setAnimation(render);
// UI.
const UiComponent = <Ui
  worldTime={worldTime}
  Parser={AugmentedParser}
/>;
ReactDOM.render(UiComponent, stage.ui);
// Eval.
const evaluationContext = {
  room,
  selfEntity,
  stage,
};
// Just inject it into global for now.
window.humus = evaluationContext;