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HTML

              
                <div class="resources">
  <div class="resource" id="days">
    <span class="label">Date</span>
    <span class="value">0</span>
  </div>
  <div class="resource" id="wood">
    <span class="label">Wood</span>
    <span class="value">0</span>
  </div>
  <div class="resource" id="food">
    <span class="label">Food</span>
    <span class="value">0</span>
  </div>
  <div class="resource" id="population">
    <span class="label">People</span>
    <span class="value">0</span>
  </div>
  <div class="resource hidden" id="hungry">
    <span class="label">Starving</span>
    <span class="value">0</span>
  </div>
</div>
<div class="actions">
  <button id="chop-wood">Chop Wood</button>
  <button id="forage">Forage</button>
  <button id="hunt">Hunt</button>
  <label id="achievements" class="btn" for="achievements-checkbox">Achievements</label>
</div>
<input type="checkbox" id="achievements-checkbox" class="hidden">
<div class="achievements">Achievements</div>

<div id="log"></div>

              
            
!

CSS

              
                body {
  margin: 0;
  font-family: sans;
}

.resources {
  display: flex;
  background: #666;
  padding: 5px 7px;
}

.resource {
  display: flex;
  flex-direction: column;
  text-align: center;
  background: #2d2929;
  color: white;
  margin: 5px 2px;
  padding: 7px;
  border-radius: 5px;
  transition: background-color 1s;
}
.resource.green {
  background: #4b9d4b;
  transition: background-color 100ms;
}
.resource.red {
  background: #c62929;
  transition: background-color 100ms;
}

.resource#hungry {
  background: #c62929;
}

#log {
  overflow: hidden;
}

#log p {
  margin: 0;
  line-height: 2;
  transition: margin-top 0.2s;
  height: 30px;
}
#log p.new {
  margin-top: -30px;
  transition: margin-top 0s;
}

#log p.red {
  color: red;
}

.hidden {
  display: none;
}

button, .btn {
	border-radius: 2px;
	font-size: 20px;
	padding: 0.6em 1em;
	text-transform: uppercase;
	border: 1px solid #666;
	background: #c5d680;
	cursor: pointer;
	line-height: 25px;
	color: #333;
}
button:hover {
  background: white;
}

.actions {
	padding: 8px;
	text-align: center;
	background: #9aad4d;
}

#achievements {
  background: #80bbd6;
}
.achievements {
  overflow: hidden;
  max-height: 200px;
  transition: max-height 500ms;
}
input#achievements-checkbox:not(:checked) + .achievements {
  max-height: 0;
}
              
            
!

JS

              
                const $ = q => document.querySelector(q)
const on = (elem, event, callback) => elem.addEventListener(event, callback)
const resources = {
  wood: 3,
  food: 35,
}
const population = {
  ready: 15,
  hungry: 0,
  sick: 0,
  hurt: 0,
}
const achievements = {
  carpentry: {
    cost: {
      wood: 10,
      food: 10,
      people: 4
    }
  },
  shipyard: {
    requires: [
      'carpentry'
    ]
  }
}

const date = new Date('1499/05/13')
const DAY = 10000

on($('#chop-wood'), 'click', () => fetchWood())
on($('#forage'), 'click', () => forage())
on($('#hunt'), 'click', () => hunt())

const log = (text, color) => {
  if ($('#log .new')) {
    setTimeout(() => log(text, color), 500)
    return
  }
  const newLog = document.createElement('p')
  newLog.innerText = text
  if (color) newLog.classList.add(color)
  newLog.classList.add('new')
  $('#log').prepend(newLog)
  setTimeout(() => {
    newLog.classList.remove('new')
  }, 200)
}

const fetchWood = () => {
  population.ready -= 2
  setTimeout(bring('wood', 2, 5, 0.05), DAY * 0.5)
  log('πŸŒ³πŸ‘¬ 2 people set off to bring wood.')
  updateView()
}

const forage = () => {
  population.ready -= 2
  setTimeout(bring('food', 2, 4, 0), DAY * 0.3)
  log('πŸŒΎπŸ‘¬ 2 people have gone foraging.')
  updateView()
}

const hunt = () => {
  population.ready -= 4
  setTimeout(bring('food', 4, 12, 0.1), DAY * 0.6)
  log('πŸΉπŸ‘¨β€πŸ‘©β€πŸ‘¦β€πŸ‘¦ 4 hunters left to bring food.')
  updateView()
}

const bring = (resource, partySize, amount, risk) => () => {
  if (Math.random() > risk) {
    log(`🌟 A party of ${partySize} has returned with ${amount} ${resource} successfully.`)
    resources[resource] += amount
    population.ready += partySize
  } else {
    log(`πŸ’€ A party of ${partySize} returned from fetching ${resource}, but got attacked by wild animals. 1 person died`, 'red')
    resources[resource] += Math.floor(amount / 2)
    population.ready += partySize - 1
    blink('population', 'red')
  }
  updateView()
  blink(resource, 'green')
}

const blink = (resource, color) => {
  $(`#${resource}`).classList.add(color)
  setTimeout(() => {
    $(`#${resource}`).classList.remove(color)
  }, 100);
}

const updateView = () => {
  $('#wood .value').innerText = resources.wood
  $('#food .value').innerText = resources.food

  $('#population .value').innerText = population.ready
  $('#hungry .value').innerText = population.hungry
  if (population.hungry < 1) {
    $('#hungry').classList.add('hidden')
  } else {
    $('#hungry').classList.remove('hidden')
  }
  
  $('#forage').disabled = population.ready < 2
  $('#chop-wood').disabled = population.ready < 2
  $('#hunt').disabled = population.ready < 4
}

updateDate = () => {
  date.setDate(date.getDate() + 1)
  $('#days .value').innerText = `${date.getDate()} / ${date.getMonth() + 1} / ${date.getFullYear()}`
}

const nextDay = () => {
  updateDate()
  
  if ((population.ready + population.hungry) < 1) {
    log(`πŸ’€πŸ’€πŸ’€ Your population was decimated`, 'red')
    stop()
  }
  if (population.hungry > 0) {
    population.hungry -= 1
    log(`πŸ’€ One person has died from starvation. +5 food.`, 'red')
    resources.food += 5
  }
  
  population.ready += population.hungry
  population.hungry = 0

  resources.food -= population.ready
  if (resources.food < 0) {
    population.ready += resources.food
    population.hungry += -resources.food
    resources.food = 0
    log(`😞 Due to lack of food, ${population.hungry} are starving and can't work.`, 'red')
  }
  updateView()
}

// init
const dayInterval = setInterval(nextDay, DAY)
const stop = () => {
  clearInterval(dayInterval)
}
updateDate()
updateView()

              
            
!
999px

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