'use strict'

const api = window.rpInstaller

const state = {
  packs: [],
  selectedKey: null,
  installing: false,
  installed: false,
  resourcepackPath: ''
}

const pageHost = document.getElementById('pageHost')
const stepIndicator = document.getElementById('stepIndicator')
const logViewer = document.getElementById('logViewer')
const logBody = document.getElementById('logBody')
const logToggle = document.getElementById('logToggle')

logToggle.addEventListener('click', function () {
  logViewer.classList.toggle('collapsed')
  if (logViewer.classList.contains('collapsed')) {
    logViewer.style.height = '36px'
    logToggle.textContent = '펼치기'
  } else {
    logViewer.style.height = ''
    logToggle.textContent = '접기'
  }
})

api.onLog(function (line) {
  logViewer.hidden = false
  logBody.textContent += line + '\n'
  logBody.scrollTop = logBody.scrollHeight
})

function setActiveStep(step) {
  stepIndicator.querySelectorAll('li').forEach(function (item) {
    var index = Number(item.getAttribute('data-step'))
    item.classList.remove('active', 'done')
    if (index < step) item.classList.add('done')
    if (index === step) item.classList.add('active')
  })
}

function clearPage() { pageHost.innerHTML = '' }

// ── 1단계: 음악퀴즈 선택 ────────────────────────────
function renderStep1() {
  setActiveStep(1)
  clearPage()
  var section = document.createElement('section')
  section.className = 'page'
  section.innerHTML =
    '<h2>1단계. 음악퀴즈 선택</h2>' +
    '<div id="packList" class="cardChoice"><p class="formMessage">목록을 불러오는 중...</p></div>' +
    '<div class="actionRow"><span></span><button class="primaryBtn" id="next" disabled>다음</button></div>'
  pageHost.appendChild(section)
  var listEl = section.querySelector('#packList')
  var nextBtn = section.querySelector('#next')

  function renderList() {
    listEl.innerHTML = ''
    if (state.packs.length === 0) {
      listEl.innerHTML = '<p class="formMessage error">등록된 음악퀴즈가 없습니다.</p>'
      return
    }
    state.packs.forEach(function (pack) {
      var card = document.createElement('button')
      card.type = 'button'
      card.className = 'choiceCard'
      if (state.selectedKey === pack.key) card.classList.add('active')
      var verLabel = pack.mcVersion ? '마인크래프트 ' + escapeHtml(pack.mcVersion) + ' · ' : ''
      card.innerHTML =
        '<strong>' + escapeHtml(pack.name) + '</strong>' +
        '<small>' + verLabel +
        '음악 ' + pack.list.music.length + '곡 · 사진 ' + pack.list.images.length + '장</small>'
      card.addEventListener('click', function () {
        state.selectedKey = pack.key
        nextBtn.disabled = false
        renderList()
      })
      listEl.appendChild(card)
    })
  }

  nextBtn.addEventListener('click', function () {
    if (!state.selectedKey) return
    api.selectPack(state.selectedKey).then(function () {
      renderStep2()
    }).catch(function (err) {
      alert(err.message || '선택 실패')
    })
  })

  api.loadPacks().then(function (packs) {
    state.packs = packs || []
    renderList()
  }).catch(function (err) {
    listEl.innerHTML = '<p class="formMessage error">목록 로드 실패: ' + escapeHtml(err.message || '') + '</p>'
  })
}

// ── 2단계: 설치 진행 ────────────────────────────────
function renderStep2() {
  setActiveStep(2)
  clearPage()
  var section = document.createElement('section')
  section.className = 'page'
  section.innerHTML =
    '<h2>2단계. 리소스팩 설치</h2>' +
    '<p class="formMessage">아래 "다음"을 누르면 음악·사진을 받아 리소스팩을 만들고 ' +
    '<code>%appdata%/.minecraft/resourcepacks/</code> 에 넣습니다.</p>' +
    '<div class="actionRow">' +
    '  <button class="secondaryBtn" id="prev">이전</button>' +
    '  <button class="primaryBtn" id="start">다음</button>' +
    '  <button class="secondaryBtn" id="cancel" hidden>취소</button>' +
    '</div>'
  pageHost.appendChild(section)
  var prevBtn = section.querySelector('#prev')
  var startBtn = section.querySelector('#start')
  var cancelBtn = section.querySelector('#cancel')

  prevBtn.addEventListener('click', function () {
    if (state.installing) return
    renderStep1()
  })

  startBtn.addEventListener('click', function () {
    if (state.installing) return
    state.installing = true
    startBtn.disabled = true
    prevBtn.disabled = true
    cancelBtn.hidden = false
    logViewer.hidden = false

    api.startInstall().then(function (result) {
      state.installing = false
      state.installed = true
      state.resourcepackPath = (result && result.resourcepackPath) || ''
      renderStep3()
    }).catch(function (err) {
      state.installing = false
      startBtn.disabled = false
      prevBtn.disabled = false
      cancelBtn.hidden = true
      alert('설치 실패: ' + (err.message || err))
    })
  })

  cancelBtn.addEventListener('click', function () {
    api.cancelInstall()
  })
}

// ── 3단계: 완료 ────────────────────────────────────
function renderStep3() {
  setActiveStep(3)
  clearPage()
  var section = document.createElement('section')
  section.className = 'page'
  section.innerHTML =
    '<h2>3단계. 완료</h2>' +
    '<p class="formMessage">리소스팩 설치를 완료했습니다.</p>' +
    (state.resourcepackPath
      ? '<p class="formMessage"><code>' + escapeHtml(state.resourcepackPath) + '</code></p>'
      : '') +
    '<div class="actionRow">' +
    '  <button class="secondaryBtn" id="openFolder">리소스팩 폴더 열기</button>' +
    '  <button class="primaryBtn" id="finish">확인</button>' +
    '</div>'
  pageHost.appendChild(section)
  section.querySelector('#openFolder').addEventListener('click', function () {
    api.openResourcepackFolder()
  })
  section.querySelector('#finish').addEventListener('click', function () {
    api.quit()
  })
}

function escapeHtml(s) {
  return String(s).replace(/[&<>"']/g, function (c) {
    return c === '&' ? '&amp;' : c === '<' ? '&lt;' : c === '>' ? '&gt;' : c === '"' ? '&quot;' : '&#39;'
  })
}

renderStep1()