Web Dev Solutions

import * as firingArc from './game/firing_arc.js';
import * as sightLine from './game/sight_line.js';
import * as soldier from './game/soldier.js';
import { Observable } from './observable';
import { programmaticPan } from 'pan-zoom';

const frontmostStore = new Map();

let svg,
  placing = [];

function getCellContents(cell) {
  return cell.querySelectorAll('*:not(use[href="#hex"])');
}

function getGridIndex({ parentElement: { dataset: { q, r, s, t }}}) {
  return { q: +q, r: +r, s: +s, t: +t };
}

function getHex(cell) {
  return cell.querySelector('use[href="#hex"]');
}

function getCellOccupant(cell) {
  return cell.querySelector('.counter') || svg.querySelector('.grid-top .counter');
}

function getCells(svg) {
  return svg.querySelectorAll('[data-q][data-r][data-s][data-t]');
}

function getLockedSightLine(svg) {
  return svg.querySelector('line.sight-line:not(.active)');
}

function getActiveSightLine(svg) {
  return svg.querySelector('line.sight-line.active');
}

function isCounter(el) {
  const regex = new RegExp('^#counter-')
  return el && regex.test(el.getAttribute('href'));
}

function isMechTemplate(el) {
  return el && el.getAttribute('class') === 'mech-template';
}

function getCellPosition(cell) {
  const [x, y] = cell.getAttributeNS(null, 'transform').match(/-?\d+\.?\d*/g);

  return { x, y };
}

function getCell(q, r, s, t) {
  return svg.querySelector(`g[data-q="${q}"][data-r="${r}"][data-s="${s}"][data-t="${t}"]`);
}

function getCounterAtGridIndex(...coords) {
  return getCell(...coords).querySelector('.counter');
}

function getSelected() {
  return svg.querySelector(`.counter.selected[data-allegiance][data-number]`);
}

function deselect() {
  const selected = getSelected();
  placing = [];

  if (selected) {
    selected.classList.remove(soldier.getSelectedClass());
    clearSightLine();
    firingArc.clipAll(svg);
  }
}

function clearSightLine() {
  sightLine.setHexes([]);
  sightLine.clear();
  Observable.notify('distance');
}

function calcSightLineIndexes(source, target) {
  const { q: sq, r: sr, s: ss } = source.dataset;
  const { q: tq, r: tr, s: ts } = target.dataset;
  const sourceIndex = { q: +sq, r: +sr, s: +ss };
  const targetIndex = { q: +tq, r: +tr, s: +ts };

  return sightLine.calcIndexes(sourceIndex, targetIndex);
}

function getSightLineHexes(indexes) {
  const selector = indexes
    .map(({ q, r, s }) => `g[data-q="${q}"][data-r="${r}"][data-s="${s}"] use[href="#hex"]`)
    .join(', ');

  return svg.querySelectorAll(selector);
}

function calcSightLine(source, target) {
  const indexes = calcSightLineIndexes(source, target);
  const hexes = getSightLineHexes(indexes);
  sightLine.setHexes(hexes);
  Observable.notify('distance', indexes.length - 1);
}

function updateSightLine(cell) {
  calcSightLine(cell, sightLine.getLockTarget());
  sightLine.update(getCellPosition(cell));
}

function drawSightLine(sourceCell, targetCell) {
  calcSightLine(sourceCell, targetCell);
  const line = sightLine.create(getCellPosition(sourceCell), getCellPosition(targetCell));
  svg.querySelector('.gameboard').appendChild(line);
}

function selectOffBoard() {
  Observable.notify('select', this, { revealRecord: true });
}

function viewElevation(elevationLevel) {
  const gb = svg.querySelector('.gameboard');
  gb.dataset.viewElevation = elevationLevel;
}

function panMapToCounter(counter) {
  const gb = svg.querySelector('.gameboard');

  if (gb.contains(counter)) {
    Observable.notify('viewElevation', counter.parentElement.dataset.t);
    const counterRect = counter.getBoundingClientRect();
    const mapRect = svg.parentNode.defaultView.frameElement.getBoundingClientRect();

    const counterCoords = {
      clientX: counterRect.x + counterRect.width / 2,
      clientY: counterRect.y + counterRect.height / 2
    };

    const mapViewportCenterCoords = {
      clientX: mapRect.width / 2,
      clientY: mapRect.height / 2
    };

    programmaticPan(gb, counterCoords, mapViewportCenterCoords);
  }
}

function select(data, opts) {
  const counter = data && (soldier.getCounter(svg, data) || soldier.createCounter(data));
  const isSelected = data && data.classList && data.classList.contains('selected');

  deselect();

  if (isSelected || !data) return;

  if (opts?.revealCounter && document.querySelector('#auto-center-map').checked)
    panMapToCounter(counter);

  counter.classList.add(soldier.getSelectedClass());
  firingArc.get(svg, counter).forEach(el => el.removeAttribute('clip-path'));
  placing.push(counter);
}

function endMove() {
  const selected = getSelected();

  if (selected) {
    deselect();
  }
}

export function start(el) {
  svg = el;
  const grid = svg.querySelector('.grid');
  const frontmost = grid.querySelector('.frontmost');

  // For when the pointer leaves the window
  document.querySelector('object').addEventListener('pointerout', e => {
    if (clearHexDialog.open) return;
    svg.querySelectorAll('.hover').forEach(el => el.classList.remove('hover'));

    [...frontmost.children].forEach(child => {
      const parent = frontmostStore.get(child);
      parent.append(child);
      if (child.classList.contains('counter')) {
        firingArc.toggleCounterVisibility(svg, child, false);
      }
      frontmostStore.delete(child);
    });

    getActiveSightLine(svg) && clearSightLine();
  });

  svg.addEventListener('pointerover', e => {
    const targetCell = e.target.closest('[data-q][data-r][data-s][data-t], .frontmost');

    // Pointer moves outside the edge of the grid
    if (!targetCell) {
      svg.querySelectorAll('.hover').forEach(el => el.classList.remove('hover'));

      [...frontmost.children].forEach(child => {
        const parent = frontmostStore.get(child);
        parent.append(child);
        if (child.classList.contains('counter')) {
          firingArc.toggleCounterVisibility(svg, child, false);
        }
        frontmostStore.delete(child);
      });
    }

    // Pointer moves over a cell
    if (targetCell) {
      if ([
        // that is not already highlighted
        !targetCell.classList.contains('hover'),
        // 's contents that is in frontmost, whose parent cell is not already highlighted
        !(targetCell.classList.contains('frontmost') && frontmostStore.get(e.target.closest('.frontmost > *')).classList.contains('hover'))
      ].every(e => e)) {
        svg.querySelectorAll('.hover').forEach(el => el.classList.remove('hover'));

        if (placing[0]?.getAttributeNS(null, 'class') === 'mech-template') {
          targetCell.prepend(placing[0]);
        }

        [...frontmost.children].forEach(child => {
          const parent = frontmostStore.get(child);
          parent.append(child);
          if (child.classList.contains('counter')) {
            firingArc.toggleCounterVisibility(svg, child, false);
          }
          frontmostStore.delete(child);
        });

        frontmost.setAttributeNS(null, 'transform', targetCell.getAttributeNS(null, 'transform'));

        const children = [...targetCell.children].filter(c => c.getAttributeNS(null, 'href') !== '#hex');
        if (children.length > 0) {
          children.forEach(child => {
            if (child.classList.contains('counter')) {
              firingArc.toggleCounterVisibility(svg, child, true);
            }
            frontmostStore.set(child, targetCell);
            frontmost.append(child);
          });
        }

        targetCell.classList.contains('frontmost') ? frontmostStore.get(e.target.closest('.frontmost > *')).classList.add('hover') : targetCell.classList.add('hover');
      }
    }

    const selected = getSelected();

    if (selected && targetCell && svg.querySelector('.grid').contains(selected) && !getLockedSightLine(svg) && selected.parentElement !== frontmost) {
      clearSightLine();
      drawSightLine(selected.parentElement, grid.querySelector('.hover'));
    } else {
      getActiveSightLine(svg) && clearSightLine();
    }
  });

  grid.addEventListener('click', clickHandler);

  const clearHexDialog = document.querySelector('#clear-hex');

  clearHexDialog.addEventListener('close', e => {
    if (clearHexDialog.returnValue === 'confirm') {
      [...frontmost.children].forEach(child => {
        if (child.classList.contains('counter'))
          firingArc.get(svg, child).forEach(el => el.remove());

        frontmostStore.delete(child);
        child.remove();
      });
    }
  });

  grid.addEventListener('contextmenu', e => {
    e.preventDefault();

    const selected = getSelected();

    if (selected) {
      if (sightLine.getSightLine()) sightLine.toggleLock(grid.querySelector('.hover'));
      if (getActiveSightLine(svg)) {
        clearSightLine();
        if (selected.parentElement !== frontmost)
          drawSightLine(selected.parentElement, grid.querySelector('.hover'));
      }
    } else {
      clearHexDialog.showModal();
    }
  });

  const startingLocations = svg.querySelector('.start-locations');
  startingLocations && getUnits(startingLocations).forEach(unit => unit.addEventListener('click', selectOffBoard));

  function clickHandler(e) {
    const targetCell = grid.querySelector('.hover');
    const occupant = frontmost.querySelector('.counter');
    let toPlace = placing.pop();

    if (isCounter(toPlace) || isMechTemplate(toPlace)) {
      frontmostStore.set(toPlace, targetCell);
      isMechTemplate(toPlace) ? frontmost.prepend(toPlace) : frontmost.append(toPlace);
      if (isCounter(toPlace)) arrangeCounters(frontmost);
      removeEventListener("keydown", handleMechTemplateRotation);
    } else if (toPlace && !occupant) {
      frontmostStore.set(toPlace, targetCell);
      const mechTemplate = frontmost.querySelector('.mech-template');
      mechTemplate ? mechTemplate.after(toPlace) : frontmost.prepend(toPlace);
      placing.push(toPlace);
      getLockedSightLine(svg) ? updateSightLine(targetCell) : clearSightLine();
    } else if (toPlace && occupant) {
      if (toPlace === occupant) {
        Observable.notify('select');
      } else {
        Observable.notify('select', occupant, { revealRecord: true });
      }
    } else if (!toPlace && occupant) {
      Observable.notify('select', occupant, { revealRecord: true });
    }

    const selected = getSelected();
  }

  Observable.subscribe('select', select);
  Observable.subscribe('endmove', endMove);
  Observable.subscribe('viewElevation', viewElevation);

  console.log('gameboard.js loaded');
}

export function stop() {
  Observable.unsubscribe('select', select);
  Observable.unsubscribe('endmove', endMove);
  Observable.unsubscribe('viewElevation', viewElevation);
}

export function getUnits() {
  return soldier.getAllCounters(svg);
}

export function clearFiringArcs(allegiance) {
  firingArc.clear(svg, allegiance);
}

export function toggleFiringArcVisibility() {
  firingArc.toggleVisibility(svg, this.dataset.allegiance);
}

export function setFiringArc() {
  const counter = getSelected(),
    isOnBoard = counter => counter && counter.parentElement.hasAttribute('data-q');

  if (isOnBoard(counter)) {
    firingArc.set(svg, this.dataset.size, counter, getCellPosition(counter.parentElement));
  }
}

export function setCounter(name) {
  const selected = getSelected();
  const counter = document.createElementNS(svgns, 'use');

  counter.addEventListener('click', e => {
    e.stopPropagation()
    const container = counter.parentElement;
    counter.remove()
    arrangeCounters(container);
  });

  counter.setAttributeNS(null, 'href', `#counter-${name}`);
  counter.classList.add(`counter-${name}`);

  if (selected) {
    selected.append(counter);
    arrangeCounters(selected);
  }
  else
    placing.push(counter);
}

function arrangeCounters(container) {
  const counters = [...container.children].filter(isCounter);
  const length = 12;
  const gravity = 1;
  const lateralForce = gravity;
  const rads = Math.atan(lateralForce / gravity);
  const bestFitCount = 8;
  const deflection = counters.length > bestFitCount ? 2 * Math.PI / counters.length : Math.atan(lateralForce / gravity);

  counters.forEach((counter, index, arr) => {
    const mult = index - arr.length / 2 + 0.5;
    const theta = deflection * mult;
    const x = length * Math.sin(theta);
    const y = length * Math.cos(theta);
    counter.setAttributeNS(null, 'style', `--x: ${-x}px; --y: ${y}px`);
  });
}

function handleMechTemplateRotation(event) {
  const counter = placing[0];
  const upper = placing[0].querySelector('use[href="#mech-template-upper"]');

  if (event.key === 'a') {
    let direction = +counter.style.transform.match(/-?\d+/) || 0;
    direction -= 60;
    counter.style.transform = `rotate(${direction}deg)`;
  } else if (event.key === 'd') {
    let direction = +counter.style.transform.match(/-?\d+/) || 0;
    direction += 60;
    counter.style.transform = `rotate(${direction}deg)`;
  } else if (event.key === 'q') {
    let facing = +upper.style.transform.match(/-?\d+/) || 0;
    facing = facing <= -60 ? -60 : facing - 60;
    upper.style.transform = `rotate(${facing}deg)`;
  } else if (event.key === 'e') {
    let facing = +upper.style.transform.match(/-?\d+/) || 0;
    facing = facing >= 60 ? 60 : facing + 60;
    upper.style.transform = `rotate(${facing}deg)`;
  }
}

export function setMechTemplate() {
  const counter = document.createElementNS(svgns, 'g');
  counter.setAttributeNS(null, 'class', 'mech-template');
  counter.style.pointerEvents = 'none';
  counter.style.transition = 'transform 0.5s';

  const lower = document.createElementNS(svgns, 'use');
  lower.setAttributeNS(null, 'href', '#mech-template-lower');

  const upper = document.createElementNS(svgns, 'use');
  upper.setAttributeNS(null, 'href', '#mech-template-upper');
  upper.style.transition = 'transform 0.5s';

  counter.appendChild(lower);
  counter.appendChild(upper);

  addEventListener("keydown", handleMechTemplateRotation);
  placing.push(counter);
}