'use strict'

const api = window.rpInstaller

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

let I18N = {}

function tt(key, params) {
  var parts = String(key).split('.')
  var cur = I18N
  for (var i = 0; i < parts.length; i++) {
    if (cur && typeof cur === 'object' && parts[i] in cur) {
      cur = cur[parts[i]]
    } else {
      return key
    }
  }
  if (typeof cur !== 'string') return key
  if (!params) return cur
  return cur.replace(/\{\{\s*(\w+)\s*\}\}/g, function (_m, name) {
    return name in params ? String(params[name]) : '{{' + name + '}}'
  })
}

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 = tt('logViewer.expand')
  } else {
    logViewer.style.height = ''
    logToggle.textContent = tt('logViewer.collapse')
  }
})

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

function applyStaticI18n() {
  document.title = tt('app.title')
  var h1 = document.querySelector('.appHeader h1')
  if (h1) h1.textContent = tt('app.title')
  var stepLis = stepIndicator.querySelectorAll('li')
  stepLis.forEach(function (item) {
    var idx = item.getAttribute('data-step')
    if (idx === '1') item.textContent = tt('stepIndicator.step1')
    else if (idx === '2') item.textContent = tt('stepIndicator.step2')
    else if (idx === '3') item.textContent = tt('stepIndicator.step3')
  })
  var logH2 = logViewer.querySelector('header h2')
  if (logH2) logH2.textContent = tt('logViewer.heading')
  logToggle.textContent = tt('logViewer.collapse')
}

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>' + escapeHtml(tt('step1.heading')) + '</h2>' +
    '<div id="packList" class="cardChoice"><p class="formMessage">' + escapeHtml(tt('common.loading')) + '</p></div>' +
    '<div class="actionRow"><span></span><button class="primaryBtn" id="next" disabled>' + escapeHtml(tt('common.next')) + '</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">' + escapeHtml(tt('common.noPacks')) + '</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('selected')
      var verLabel = pack.mcVersion
        ? escapeHtml(tt('common.mcVersionLabel', { version: pack.mcVersion }))
        : ''
      card.innerHTML =
        '<strong>' + escapeHtml(pack.name) + '</strong>' +
        '<small>' + verLabel +
        escapeHtml(tt('common.trackImageCount', { music: pack.list.music.length, image: pack.list.images.length })) +
        '</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 () {
      renderAgreement()
    }).catch(function (err) {
      alert(err.message || tt('common.selectFailed'))
    })
  })

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

// 약관 동의 페이지: 1단계 직후, 2단계 설치 진입 전에 노출.
// v0.3.4~ : 사이트의 visibility 토글에 따라 표시할 약관이 결정된다. 명시적으로 빈 목록(terms:[])
// 정상 응답일 때만 단계를 건너뛰고, 네트워크/서버 오류는 차단 후 다시 시도 UI를 보여준다.
function renderAgreement() {
  setActiveStep(1)
  clearPage()
  var loadingSection = document.createElement('section')
  loadingSection.className = 'page'
  loadingSection.innerHTML = '<h2>' + escapeHtml(tt('agreement.heading')) + '</h2>' +
    '<p class="formMessage">' + escapeHtml(tt('agreement.loading')) + '</p>'
  pageHost.appendChild(loadingSection)

  api.getTermsList().then(function (res) {
    if (!res || !res.ok) {
      showAgreementError((res && res.message) || 'unknown')
      return
    }
    var terms = (res.terms || []).map(function (t) {
      return { id: t.kind, tab: t.label }
    })
    if (terms.length === 0) {
      renderStep2()
      return
    }
    clearPage()
    renderAgreementWithKinds(terms)
  }).catch(function (err) {
    showAgreementError(err && err.message ? err.message : 'unknown')
  })
}

// 약관 목록을 못 받아왔을 때: 사용자에게 오류 + 다시 시도 옵션. 동의 없이 설치 단계로
// 자동 진입하지 않도록 next 버튼을 두지 않는다.
function showAgreementError(message) {
  clearPage()
  var section = document.createElement('section')
  section.className = 'page'
  section.innerHTML =
    '<h2>' + escapeHtml(tt('agreement.heading')) + '</h2>' +
    '<p class="formMessage error">' + escapeHtml(tt('agreement.listLoadFailed', { message: message })) + '</p>' +
    '<div class="actionRow">' +
    '<button class="secondaryBtn" id="back">' + escapeHtml(tt('common.back')) + '</button>' +
    '<button class="primaryBtn" id="retry">' + escapeHtml(tt('agreement.retry')) + '</button>' +
    '</div>'
  pageHost.appendChild(section)
  section.querySelector('#back').addEventListener('click', renderStep1)
  section.querySelector('#retry').addEventListener('click', renderAgreement)
}

// 약관을 한 건씩 페이지로 보여준다. 각 약관마다 "해당 약관에 동의합니다" 체크가 있고,
// 끝까지 스크롤해 읽어야 체크할 수 있으며, [다음] 을 누르면 다음 약관 페이지가 화면
// 맨 위에서부터 나온다. 마지막 약관까지 동의하면 다음 단계(step2)로 진행한다.
function renderAgreementWithKinds(KINDS) {
  var idx = 0
  var accepted = {} // kind -> true (뒤로 갔다 와도 동의 상태 유지)
  var cache = {} // kind -> 렌더된 HTML

  var section = document.createElement('section')
  section.className = 'page'
  pageHost.appendChild(section)

  function renderCurrent() {
    var k = KINDS[idx]
    var isLast = idx === KINDS.length - 1
    section.innerHTML =
      '<h2>' + escapeHtml(tt('agreement.heading')) + '</h2>' +
      '<p class="formMessage">' + escapeHtml(tt('agreement.stepLabel', { current: idx + 1, total: KINDS.length, label: k.tab })) + '</p>' +
      '<div class="agreementBody" id="agBody" style="border-radius:10px;">' + escapeHtml(tt('agreement.loading')) + '</div>' +
      '<div class="formMessage" id="agHint">' + escapeHtml(tt('agreement.readToBottom')) + '</div>' +
      '<label class="toggleRow" style="margin-top:8px;"><input type="checkbox" id="agAccept" disabled /> ' +
      escapeHtml(tt('agreement.agreeThis')) + '</label>' +
      '<div class="formMessage" id="agMsg"></div>' +
      '<div class="actionRow">' +
      '  <button class="secondaryBtn" id="back">' + escapeHtml(tt('common.back')) + '</button>' +
      '  <button class="primaryBtn" id="next" disabled>' + escapeHtml(tt('common.next')) + '</button>' +
      '</div>'

    var body = section.querySelector('#agBody')
    var accept = section.querySelector('#agAccept')
    var nextBtn = section.querySelector('#next')
    var msg = section.querySelector('#agMsg')
    var hint = section.querySelector('#agHint')

    // 새 약관 페이지는 화면 맨 위에서부터 보이도록 스크롤을 올린다.
    if (pageHost) pageHost.scrollTop = 0

    function markReadable() {
      if (!accept.disabled) return
      accept.disabled = false
      hint.textContent = ''
    }
    function checkScrolled() {
      if (body.scrollHeight - body.scrollTop - body.clientHeight <= 6) markReadable()
    }
    body.addEventListener('scroll', checkScrolled)

    accept.addEventListener('change', function () {
      accepted[k.id] = accept.checked
      nextBtn.disabled = !accept.checked
      if (accept.checked) { msg.textContent = ''; msg.classList.remove('error') }
    })

    nextBtn.addEventListener('click', function () {
      if (!accept.checked) {
        msg.textContent = tt('agreement.agreeRequired')
        msg.classList.add('error')
        return
      }
      if (isLast) renderStep2()
      else { idx++; renderCurrent() }
    })
    section.querySelector('#back').addEventListener('click', function () {
      if (idx === 0) renderStep1()
      else { idx--; renderCurrent() }
    })

    function afterLoad() {
      body.scrollTop = 0
      if (accepted[k.id]) {
        accept.disabled = false
        accept.checked = true
        nextBtn.disabled = false
        hint.textContent = ''
      }
      setTimeout(function () {
        if (body.scrollHeight - body.clientHeight <= 6) markReadable()
        else checkScrolled()
      }, 0)
    }

    if (cache[k.id]) {
      body.innerHTML = cache[k.id]
      afterLoad()
    } else {
      body.textContent = tt('agreement.loading')
      api.getTerm(k.id).then(function (res) {
        if (!res.ok) {
          body.innerHTML = '<p class="formMessage error">' + escapeHtml(tt('agreement.loadFailed', { message: res.message || '' })) + '</p>'
          markReadable()
          return
        }
        var html = renderTermsMarkdown(res.content || '')
        cache[k.id] = html
        body.innerHTML = html
        afterLoad()
      }).catch(function (err) {
        body.innerHTML = '<p class="formMessage error">' + escapeHtml(tt('agreement.loadFailed', { message: err.message })) + '</p>'
        markReadable()
      })
    }
  }

  renderCurrent()
}

// 인스톨러용 미니 markdown 렌더러. 사이트 termsEditor 와 같은 규칙을 처리한다.
function renderTermsMarkdown(src) {
  function escHtml(s) {
    return s.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;')
  }
  function inline(s) {
    s = escHtml(s)
    s = s.replace(/`([^`]+)`/g, '<code>$1</code>')
    s = s.replace(/\*\*([^*]+)\*\*/g, '<strong>$1</strong>')
    s = s.replace(/(^|\W)\*([^*\n]+)\*(?=\W|$)/g, '$1<em>$2</em>')
    s = s.replace(/\[([^\]]+)\]\(([^)]+)\)/g, '<a href="$2" target="_blank" rel="noopener">$1</a>')
    s = s.replace(/(^|[\s(])(https?:\/\/[^\s)]+)/g, function (m, p, u) {
      return p + '<a href="' + u + '" target="_blank" rel="noopener">' + u + '</a>'
    })
    return s
  }
  var lines = src.replace(/\r\n/g, '\n').split('\n')
  var out = []
  var i = 0
  var stack = null
  function closeList() { if (stack) { out.push('</' + stack + '>'); stack = null } }
  while (i < lines.length) {
    var line = lines[i]
    var fence = /^```(\w*)\s*$/.exec(line)
    if (fence) {
      closeList()
      var code = []; i += 1
      while (i < lines.length && !/^```\s*$/.test(lines[i])) { code.push(lines[i]); i += 1 }
      if (i < lines.length) i += 1
      out.push('<pre><code>' + escHtml(code.join('\n')) + '</code></pre>')
      continue
    }
    var togStart = /^:::toggle\s+(.+)$/.exec(line)
    if (togStart) {
      closeList()
      var summary = togStart[1]; var body2 = []; i += 1
      while (i < lines.length && !/^:::\s*$/.test(lines[i])) { body2.push(lines[i]); i += 1 }
      if (i < lines.length) i += 1
      out.push('<details><summary>' + inline(summary) + '</summary>' + renderTermsMarkdown(body2.join('\n')) + '</details>')
      continue
    }
    var h = /^(#{1,6})\s+(.*)$/.exec(line)
    if (h) {
      closeList()
      out.push('<h' + h[1].length + '>' + inline(h[2]) + '</h' + h[1].length + '>')
      i += 1; continue
    }
    if (/^---+\s*$/.test(line)) { closeList(); out.push('<hr/>'); i += 1; continue }
    if (/^>\s?/.test(line)) {
      closeList()
      var q = []
      while (i < lines.length && /^>\s?/.test(lines[i])) { q.push(lines[i].replace(/^>\s?/, '')); i += 1 }
      out.push('<blockquote>' + renderTermsMarkdown(q.join('\n')) + '</blockquote>')
      continue
    }
    var ol = /^\s*\d+\.\s+(.*)$/.exec(line)
    if (ol) {
      if (stack !== 'ol') { closeList(); out.push('<ol>'); stack = 'ol' }
      out.push('<li>' + inline(ol[1]) + '</li>'); i += 1; continue
    }
    var ul = /^\s*[-*]\s+(.*)$/.exec(line)
    if (ul) {
      if (stack !== 'ul') { closeList(); out.push('<ul>'); stack = 'ul' }
      out.push('<li>' + inline(ul[1]) + '</li>'); i += 1; continue
    }
    if (/^\s*$/.test(line)) { closeList(); i += 1; continue }
    closeList()
    var para = [line]; i += 1
    while (i < lines.length && !/^\s*$/.test(lines[i])
      && !/^(#{1,6})\s+/.test(lines[i])
      && !/^\s*[-*]\s+/.test(lines[i])
      && !/^\s*\d+\.\s+/.test(lines[i])
      && !/^>/.test(lines[i])
      && !/^---+\s*$/.test(lines[i])
      && !/^```/.test(lines[i])
      && !/^:::/.test(lines[i])) {
      para.push(lines[i]); i += 1
    }
    out.push('<p>' + inline(para.join('\n').replace(/\n/g, '<br/>')) + '</p>')
  }
  closeList()
  return out.join('\n')
}

// ── 2단계: 설치 진행 ────────────────────────────────
function renderStep2() {
  setActiveStep(2)
  clearPage()

  var pack = null
  for (var i = 0; i < state.packs.length; i++) {
    if (state.packs[i].key === state.selectedKey) { pack = state.packs[i]; break }
  }
  var musicTotal = pack ? pack.list.music.length : 0
  var imageTotal = pack ? pack.list.images.length : 0

  var section = document.createElement('section')
  section.className = 'page'
  section.innerHTML =
    '<h2>' + escapeHtml(tt('step2.heading')) + '</h2>' +
    '<p class="formMessage">' + tt('step2.description') + '</p>' +
    '<div class="prepRow">' +
    '  <span class="prepChip" id="chip-ytdlp">' + escapeHtml(tt('step2.chipYtdlp')) + '</span>' +
    '  <span class="prepChip" id="chip-ffmpeg">' + escapeHtml(tt('step2.chipFfmpeg')) + '</span>' +
    '</div>' +
    '<div class="progressSection">' +
    '  <h3>' + escapeHtml(tt('step2.musicHeading')) + '</h3>' +
    '  <div class="sectionSub" id="music-sub">' + escapeHtml(tt('step2.musicSub', { count: musicTotal })) + '</div>' +
    '  <div class="progressGrid" id="musicGrid"></div>' +
    '</div>' +
    '<div class="progressSection">' +
    '  <h3>' + escapeHtml(tt('step2.imageHeading')) + '</h3>' +
    '  <div class="sectionSub" id="image-sub">' + escapeHtml(tt('step2.imageSub', { count: imageTotal })) + '</div>' +
    '  <div class="progressGrid" id="imageGrid"></div>' +
    '</div>' +
    '<div class="progressSection">' +
    '  <h3>' + escapeHtml(tt('step2.packageHeading')) + '</h3>' +
    '  <div class="sectionSub" id="pkg-sub">' + escapeHtml(tt('step2.packageWaiting')) + '</div>' +
    '</div>' +
    '<div class="actionRow">' +
    '  <span></span>' +
    '  <button class="dangerBtn" id="cancel">' + escapeHtml(tt('common.cancel')) + '</button>' +
    '</div>'
  pageHost.appendChild(section)

  var musicGrid = section.querySelector('#musicGrid')
  var imageGrid = section.querySelector('#imageGrid')
  var chipYtdlp = section.querySelector('#chip-ytdlp')
  var chipFfmpeg = section.querySelector('#chip-ffmpeg')
  var pkgSub = section.querySelector('#pkg-sub')
  var cancelBtn = section.querySelector('#cancel')

  function buildCard(idx) {
    var card = document.createElement('div')
    card.className = 'progressCard pending'
    card.setAttribute('data-idx', String(idx))
    card.innerHTML =
      '<div class="cardTop"><span class="label">' + idx + '</span><span class="icon">○</span></div>' +
      '<div class="bar"><span></span></div>' +
      '<div class="pct">' + escapeHtml(tt('step2.cardWaiting')) + '</div>'
    return card
  }
  for (var m = 1; m <= musicTotal; m++) musicGrid.appendChild(buildCard(m))
  for (var k = 1; k <= imageTotal; k++) imageGrid.appendChild(buildCard(k))

  function updateCard(grid, index, percent, status) {
    var card = grid.querySelector('[data-idx="' + index + '"]')
    if (!card) return
    card.classList.remove('pending', 'running', 'done', 'error')
    card.classList.add(status)
    var bar = card.querySelector('.bar > span')
    if (bar) bar.style.width = Math.max(0, Math.min(100, percent)) + '%'
    var pct = card.querySelector('.pct')
    var icon = card.querySelector('.icon')
    if (status === 'done') {
      if (pct) pct.textContent = tt('step2.cardDone')
      if (icon) icon.textContent = '✓'
      if (bar) bar.style.width = '100%'
    } else if (status === 'error') {
      if (pct) pct.textContent = tt('step2.cardError')
      if (icon) icon.textContent = '✕'
    } else if (status === 'running') {
      if (pct) pct.textContent = Math.round(percent) + '%'
      if (icon) icon.textContent = '⏳'
    } else {
      if (pct) pct.textContent = tt('step2.cardWaiting')
      if (icon) icon.textContent = '○'
    }
  }

  var stopProgress = api.onProgress(function (payload) {
    if (!payload || typeof payload !== 'object') return
    if (payload.phase === 'prep') {
      if (payload.done) {
        chipYtdlp.classList.remove('active'); chipYtdlp.classList.add('done')
        chipFfmpeg.classList.remove('active'); chipFfmpeg.classList.add('done')
        return
      }
      if (payload.message && payload.message.indexOf('yt-dlp') >= 0) {
        chipYtdlp.classList.add('active')
      } else if (payload.message && payload.message.indexOf('ffmpeg') >= 0) {
        chipYtdlp.classList.remove('active'); chipYtdlp.classList.add('done')
        chipFfmpeg.classList.add('active')
      }
      return
    }
    if (payload.phase === 'item') {
      var grid = payload.kind === 'music' ? musicGrid : imageGrid
      updateCard(grid, payload.index, payload.percent || 0, payload.status)
      return
    }
    if (payload.phase === 'package') {
      pkgSub.textContent = payload.done
        ? tt('step2.packageDone')
        : (payload.message || tt('step2.packageBuilding'))
      return
    }
  })

  // 사용자가 취소를 눌렀는지 추적. 취소 흐름에서는 installFailed 알림을 띄우지 않고
  // 조용히 step1 로 돌아간다.
  var cancelInitiated = false
  cancelBtn.addEventListener('click', function () {
    if (!state.installing || cancelInitiated) return
    cancelInitiated = true
    cancelBtn.disabled = true
    cancelBtn.textContent = tt('agreement.cancelling')
    // 사용자에게 어느 단계든 즉시 "취소 중" 신호가 보이도록 패키지 섹션 상태 갱신.
    pkgSub.textContent = tt('agreement.cancelling')
    api.cancelInstall()
  })

  // 페이지 진입 즉시 설치 시작
  state.installing = true
  logViewer.hidden = false
  api.startInstall().then(function (result) {
    state.installing = false
    state.installed = true
    state.resourcepackPath = (result && result.resourcepackPath) || ''
    if (stopProgress) stopProgress()
    renderStep3()
  }).catch(function (err) {
    state.installing = false
    if (stopProgress) stopProgress()
    if (cancelInitiated) {
      // 취소: backend 가 임시 파일을 이미 정리했음. 조용히 처음 단계로.
      renderStep1()
      return
    }
    // 그 외 오류: 받아둔 음악·사진은 보존되어 있으므로 '재시도' 로 이어받을 수 있다.
    showInstallError((err && err.message) || String(err))
  })
}

// 설치 실패 화면: 이어받기('재시도')와 처음으로('처음으로') 선택지를 제공한다.
// 재시도 시 이미 받아둔 곡·사진은 건너뛰고 실패한 지점부터 이어서 설치한다.
function showInstallError(message) {
  setActiveStep(2)
  clearPage()
  var section = document.createElement('section')
  section.className = 'page'
  section.innerHTML =
    '<h2>' + escapeHtml(tt('step2.heading')) + '</h2>' +
    '<p class="formMessage error">' + escapeHtml(tt('install.errorMessage', { message: message })) + '</p>' +
    '<p class="formMessage">' + escapeHtml(tt('install.resumeHint')) + '</p>' +
    '<div class="actionRow">' +
    '  <button class="secondaryBtn" id="startOver">' + escapeHtml(tt('install.startOver')) + '</button>' +
    '  <button class="primaryBtn" id="retry">' + escapeHtml(tt('install.retry')) + '</button>' +
    '</div>'
  pageHost.appendChild(section)
  section.querySelector('#retry').addEventListener('click', function () {
    // 같은 음악퀴즈로 설치를 다시 시작. backend 가 받아둔 산출물을 건너뛴다.
    renderStep2()
  })
  section.querySelector('#startOver').addEventListener('click', function () {
    // 이어받지 않고 처음으로: 받아둔 임시 파일을 정리한 뒤 1단계로.
    api.discardInstall().then(function () {
      renderStep1()
    }).catch(function () {
      renderStep1()
    })
  })
}

// ── 3단계: 완료 ────────────────────────────────────
function renderStep3() {
  setActiveStep(3)
  clearPage()
  var section = document.createElement('section')
  section.className = 'page'
  section.innerHTML =
    '<h2>' + escapeHtml(tt('step3.heading')) + '</h2>' +
    '<p class="formMessage">' + escapeHtml(tt('step3.message')) + '</p>' +
    '<p class="formMessage">' + escapeHtml(tt('step3.applyNotice')) + '</p>' +
    (state.resourcepackPath
      ? '<p class="formMessage"><code>' + escapeHtml(state.resourcepackPath) + '</code></p>'
      : '') +
    '<div class="actionRow">' +
    '  <button class="secondaryBtn" id="openFolder">' + escapeHtml(tt('common.openFolder')) + '</button>' +
    '  <button class="primaryBtn" id="finish">' + escapeHtml(tt('common.confirm')) + '</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;'
  })
}

;(async function () {
  try { I18N = (await api.loadLocale()) || {} } catch (_) { I18N = {} }
  applyStaticI18n()
  renderStep1()
})()