/* OSS中转直链 oss_browser_link 前端逻辑（双模式弹窗 / 交互详情 / 协议拉起） */
;(function () {
  'use strict'
  var CFG = { ui_mode: 'debug', public_url: '', launch_protocol: 'ossbrowser' }

  function $ (id) { return document.getElementById(id) }

  function bjNow () {
    try { return new Date().toLocaleString('sv-SE', { timeZone: 'Asia/Shanghai' }) } catch (e) { return new Date().toLocaleString() }
  }

  /* ---------- Toast ---------- */
  var toastTimer = null
  function showToast (msg, kind) {
    var el = $('obl-toast')
    el.textContent = msg
    el.className = kind || ''
    clearTimeout(toastTimer)
    toastTimer = setTimeout(function () { el.className = 'obl-hidden' }, 2000)
  }

  /* ---------- 交互详情弹窗（双模式） ---------- */
  var dialogTimer = null
  function showDialog (title, text, opts) {
    opts = opts || {}
    $('obl-dialog-title').textContent = title
    $('obl-dialog-body').textContent = text
    $('obl-dialog').classList.remove('obl-hidden')
    clearTimeout(dialogTimer)
    if (opts.error) return // 异常：停留窗口，不自动关闭
    var delay = CFG.ui_mode === 'debug' ? 3000 : 2000
    dialogTimer = setTimeout(closeDialog, delay)
  }
  function closeDialog () {
    clearTimeout(dialogTimer)
    $('obl-dialog').classList.add('obl-hidden')
  }

  function buildLog (rec) {
    return [
      '触发动作: ' + rec.action,
      '时间: ' + rec.time,
      '接口: ' + rec.method + ' ' + rec.url,
      '请求参数: ' + JSON.stringify(rec.params || {}),
      '状态: ' + rec.status,
      '返回结果: ' + rec.result,
      rec.error ? '错误信息: ' + rec.error : '',
      '耗时: ' + rec.cost + 'ms'
    ].filter(Boolean).join('\n')
  }

  /* 包装一次与后台/系统交互的操作，按 ui_mode 分支提示 */
  function runTracked (action, url, method, params, fn, opts) {
    opts = opts || {}
    var t0 = Date.now()
    var rec = { action: action, time: bjNow(), url: url, method: method, params: params, status: '进行中', result: '', error: '', cost: 0 }
    return Promise.resolve()
      .then(fn)
      .then(function (result) {
        rec.cost = Date.now() - t0
        rec.status = '成功'
        rec.result = typeof result === 'string' ? result : JSON.stringify(result)
        if (CFG.ui_mode === 'debug') showDialog('交互详情 · ' + action, buildLog(rec))
        else if (!opts.silent) showToast(action + ' 成功', 'success')
        return result
      })
      .catch(function (err) {
        rec.cost = Date.now() - t0
        rec.status = '失败'
        rec.error = String((err && err.message) || err)
        showDialog('交互详情 · ' + action, buildLog(rec), { error: true }) // 异常双模式均强提示
        throw err
      })
  }

  /* ---------- 初始化：拉配置 + 文件状态 ---------- */
  function init () {
    fetch('/api/oss_browser_link/config').then(function (r) { return r.json() }).then(function (j) {
      if (j && j.ok && j.data) {
        CFG.ui_mode = j.data.ui_mode || 'debug'
        CFG.public_url = j.data.public_url || ''
        CFG.launch_protocol = j.data.launch_protocol || 'ossbrowser'
      }
    }).catch(function () {})
    $('obl-link-input').value = CFG.public_url || location.origin + '/download_files/oss-browser-win32-x64.zip'
    refreshFileInfo()
    bindEvents()
  }

  function fmtSize (n) {
    if (!Number.isFinite(n)) return ''
    if (n >= 1024 * 1024) return (n / 1024 / 1024).toFixed(2) + ' MB'
    if (n >= 1024) return (n / 1024).toFixed(1) + ' KB'
    return n + ' B'
  }

  function refreshFileInfo () {
    var t0 = Date.now()
    fetch('/api/oss_browser_link/info').then(function (r) { return r.json() }).then(function (j) {
      var meta = $('obl-file-meta')
      var st = $('obl-file-status')
      var cost = Date.now() - t0
      if (j && j.ok && j.data && j.data.available) {
        meta.textContent = '大小 ' + fmtSize(j.data.size) + ' · 已中转至本站 · 鉴权保护'
        st.textContent = '可下载'
        st.className = 'obl-status ok'
        $('obl-download-btn').disabled = false
      } else {
        meta.textContent = '尚未检测到中转文件 · 请等待管理员中转后刷新'
        st.textContent = '未就绪'
        st.className = 'obl-status miss'
        $('obl-download-btn').disabled = true
      }
      if (CFG.ui_mode === 'debug') {
        meta.textContent += ' · 检测耗时 ' + cost + 'ms'
      }
    }).catch(function () {
      $('obl-file-meta').textContent = '文件状态检测失败'
      $('obl-file-status').textContent = '异常'
      $('obl-file-status').className = 'obl-status miss'
    })
  }

  /* ---------- 按钮事件 ---------- */
  function bindEvents () {
    $('obl-copy-btn').addEventListener('click', function () {
      var url = $('obl-link-input').value
      var btn = this
      btn.disabled = true; btn.textContent = '复制中…'
      runTracked('复制直链', location.href, 'CLIPBOARD', { url: url }, function () {
        if (navigator.clipboard && navigator.clipboard.writeText) return navigator.clipboard.writeText(url)
        $('obl-link-input').select()
        document.execCommand('copy')
        return 'fallback copy ok'
      }).then(function () {
        showToast('直链已复制（对方需鉴权才能下载）', 'success')
      }).catch(function () {})
      btn.disabled = false; btn.textContent = '复制直链'
    })

    $('obl-download-btn').addEventListener('click', function () {
      var btn = this
      btn.disabled = true; btn.textContent = '准备下载…'
      runTracked('下载安装包', '/download_files/oss-browser-win32-x64.zip', 'GET', {}, function () {
        return new Promise(function (resolve, reject) {
          var xhr = new XMLHttpRequest()
          xhr.open('GET', '/download_files/oss-browser-win32-x64.zip')
          xhr.responseType = 'blob'
          xhr.onload = function () {
            if (xhr.status !== 200) return reject(new Error('HTTP ' + xhr.status))
            var a = document.createElement('a')
            a.href = URL.createObjectURL(xhr.response)
            a.download = 'oss-browser-win32-x64.zip'
            document.body.appendChild(a)
            a.click()
            setTimeout(function () { URL.revokeObjectURL(a.href); a.remove() }, 4000)
            resolve('下载已触发，大小 ' + (xhr.response ? xhr.response.size : 0) + ' 字节')
          }
          xhr.onerror = function () { reject(new Error('网络错误')) }
          xhr.send()
        })
      }).catch(function () {})
      btn.disabled = false; btn.textContent = '⬇ 下载 oss-browser 安装包'
    })

    $('obl-launch-btn').addEventListener('click', function () {
      launchOssBrowser()
    })

    $('obl-reg-btn').addEventListener('click', function () {
      var btn = this
      btn.disabled = true; btn.textContent = '下载中…'
      runTracked('下载注册脚本', '/tools/oss_browser_link/assets/register_ossbrowser_launch.bat', 'GET', {}, function () {
        var a = document.createElement('a')
        a.href = '/tools/oss_browser_link/assets/register_ossbrowser_launch.bat'
        a.download = 'register_ossbrowser_launch.bat'
        document.body.appendChild(a)
        a.click()
        setTimeout(function () { a.remove() }, 2000)
        return '脚本下载已触发（放入解压目录后双击运行）'
      }).catch(function () {})
      btn.disabled = false; btn.textContent = '📄 下载一键注册脚本（首次）'
    })

    $('obl-dialog-close').addEventListener('click', closeDialog)
    $('obl-dialog-copy').addEventListener('click', function () {
      var text = $('obl-dialog-body').textContent
      if (navigator.clipboard && navigator.clipboard.writeText) navigator.clipboard.writeText(text)
      showToast('交互日志已复制', 'success')
    })
  }

  /* ---------- 协议拉起：未装则回退下载 ---------- */
  function launchOssBrowser () {
    var proto = CFG.launch_protocol || 'ossbrowser'
    var url = proto + '://launch?t=' + Date.now()
    var btn = $('obl-launch-btn')
    btn.disabled = true; btn.textContent = '正在打开…'
    runTracked('打开 oss-browser', url, 'PROTOCOL', { protocol: proto }, function () {
      return new Promise(function (resolve, reject) {
        var done = false
        var started = false
        /* 拉起成功时浏览器通常会模糊/隐藏页面 */
        window.addEventListener('blur', onBlur)
        document.addEventListener('visibilitychange', onVis)
        function onBlur () { started = true }
        function onVis () { if (document.hidden) started = true }
        try {
          var f = document.createElement('iframe')
          f.style.display = 'none'
          f.src = url
          document.body.appendChild(f)
          setTimeout(function () { try { f.remove() } catch (e) {} }, 3000)
        } catch (e) { location.href = url }
        setTimeout(function () {
          window.removeEventListener('blur', onBlur)
          document.removeEventListener('visibilitychange', onVis)
          if (done) return
          done = true
          if (started) resolve('已触发协议拉起')
          else reject(new Error('未检测到已安装的 oss-browser（协议未注册）'))
        }, 2500)
      })
    }).then(function () {
      showToast('已尝试打开 oss-browser；若浏览器弹出确认框请勾选"始终允许"', 'success')
    }).catch(function () {
      /* 未安装：自动回退下载安装包 */
      showToast('未检测到 oss-browser，已自动开始下载安装包', 'error')
      setTimeout(function () { $('obl-download-btn').click() }, 600)
    })
    setTimeout(function () { btn.disabled = false; btn.textContent = '🚀 打开 oss-browser' }, 3200)
  }

  if (document.readyState === 'loading') document.addEventListener('DOMContentLoaded', init)
  else init()
})()