/** TEA IRC TUI. Cell buffer; protocol lives in irc-client.js. */

function bareIrcPad(s, w) {
  s = String(s == null ? '' : s)
  if (w <= 0) return ''
  if (s.length > w) return s.slice(0, w)
  while (s.length < w) s += ' '
  return s
}

function bareIrcNickColWidth(cols, buf, roomsOpen) {
  if (roomsOpen || !buf || buf.kind !== 'channel') return 0
  if (cols < 80) return 0
  return cols >= 140 ? 20 : 16
}

function bareIrcMemberLabel(m, key) {
  var pref =
    m && m.modes && m.modes.indexOf('o') >= 0
      ? '@'
      : m && m.modes && m.modes.indexOf('v') >= 0
        ? '+'
        : ' '
  return pref + (m && m.nick ? m.nick : key)
}

function bareIrcFmtClock(ms) {
  var d = new Date(typeof ms === 'number' ? ms : Date.now())
  function z(n) {
    return (n < 10 ? '0' : '') + n
  }
  return z(d.getHours()) + ':' + z(d.getMinutes())
}

function bareIrcCreateTuiApp(ctx, client) {
  var tui = ctx.tui
  var size0 = tui && typeof tui.size === 'function' ? tui.size() : {}
  return {
    client: client,
    width: size0.width || 80,
    height: size0.height || 24,
    help: false,
    quitConfirm: false,
    roomsOpen: false,
    roomsCursor: 0,
    roomsFilterEdit: false,
    openedRoomsOnce: false,
    filterOpen: false,
    status: 'connecting…',
    input: tui.textinput.create({ prompt: '', focused: true, charLimit: 450 }),
    viewport: tui.viewport.create({
      width: size0.width || 80,
      height: Math.max(6, (size0.height || 24) - 6)
    }),
    init: function () {
      var self = this
      client.on('registered', function () {
        if (tui && typeof tui.send === 'function')
          tui.send({ type: 'irc.paint' })
      })
      client.on('privmsg', function () {
        if (tui && typeof tui.send === 'function')
          tui.send({ type: 'irc.paint' })
      })
      client.on('notice', function () {
        if (tui && typeof tui.send === 'function')
          tui.send({ type: 'irc.paint' })
      })
      client.on('sasl', function (p) {
        self.status = p && p.ok ? 'sasl ok' : 'sasl failed'
        if (tui && typeof tui.send === 'function')
          tui.send({ type: 'irc.paint' })
      })
      client.on('error', function (p) {
        self.status =
          'error: ' +
          ((p && (p.text || (p.error && p.error.message))) || 'error')
        if (tui && typeof tui.send === 'function')
          tui.send({ type: 'irc.paint' })
      })
      client.on('close', function () {
        self.status = 'disconnected'
        if (tui && typeof tui.send === 'function')
          tui.send({ type: 'irc.paint' })
      })
      client.on('join', function () {
        self.roomsOpen = false
        self.roomsFilterEdit = false
        if (tui && typeof tui.send === 'function')
          tui.send({ type: 'irc.paint' })
      })
      client.on('list', function () {
        if (tui && typeof tui.send === 'function')
          tui.send({ type: 'irc.paint' })
      })
      client.on('listend', function (p) {
        self.status = 'rooms ' + ((p && p.count) || 0)
        if (tui && typeof tui.send === 'function')
          tui.send({ type: 'irc.paint' })
      })
      client.on('motd_end', function () {
        var joins = (client.opts && client.opts.autojoin) || []
        if (!self.openedRoomsOnce && (!joins || !joins.length)) {
          self.openedRoomsOnce = true
          self.roomsOpen = true
          self.roomsCursor = 0
          self.status = 'pick a room  (Enter join  / filter  Esc close)'
        }
        var srv = bareIrcEnsureBuffer(client.state, 'server', '*server')
        bareIrcPushLine(client.state, srv, {
          atMs: Date.now(),
          kind: 'info',
          text:
            'You are ' +
            (client.state.nick || 'guest') +
            '.  /rooms browse   /join #libera help   /query nick   ? keys'
        })
        if (tui && typeof tui.send === 'function')
          tui.send({ type: 'irc.paint' })
      })
      this._sync()
      return null
    },
    _roomRows: function () {
      var listed = this.client.state.channelList || []
      if (listed.length) return listed
      return BARE_IRC_FEATURED_ROOMS
    },
    _openRooms: function (query) {
      this.roomsOpen = true
      this.roomsCursor = 0
      this.roomsFilterEdit = false
      if (query) this.client.list(query)
      this.status = query
        ? 'listing ' + query
        : 'featured rooms  (type /rooms linux to search)'
    },
    _joinRoomAtCursor: function () {
      var rows = this._roomRows()
      var hit = rows[this.roomsCursor]
      if (!hit || !hit.name) return
      this.roomsOpen = false
      this.roomsFilterEdit = false
      this.client.join(hit.name)
      this.status = 'joining ' + hit.name
    },
    _current: function () {
      var st = this.client.state
      return (
        st.buffers[st.currentId] || bareIrcEnsureBuffer(st, 'server', '*server')
      )
    },
    _sync: function () {
      var buf = this._current()
      buf.unread = 0
      buf.highlight = false
      var cols = Math.max(40, this.width || 80)
      var nickW = bareIrcNickColWidth(cols, buf, this.roomsOpen)
      this.viewport.width = Math.max(20, cols - (nickW ? nickW + 1 : 0))
      this.viewport.height = Math.max(4, (this.height || 24) - 6)
      if (this.roomsOpen) {
        var rows = this._roomRows()
        if (this.roomsCursor >= rows.length)
          this.roomsCursor = Math.max(0, rows.length - 1)
        var rlines = []
        var ri
        for (ri = 0; ri < rows.length; ri++) {
          var rr = rows[ri]
          var mark = ri === this.roomsCursor ? '>' : ' '
          var users =
            rr.users === '' || rr.users == null
              ? '    '
              : String(rr.users).padStart
                ? String(rr.users).padStart(4, ' ')
                : String(rr.users)
          rlines.push(
            mark +
              ' ' +
              String(rr.name || '')
                .slice(0, 18)
                .padEnd(18, ' ') +
              ' ' +
              users +
              '  ' +
              String(rr.topic || '')
          )
        }
        if (!rlines.length) rlines.push('(no rooms — /rooms linux to search)')
        this.viewport.setContent(rlines.join('\n'))
        var mid = Math.floor((this.viewport.height || 8) / 2)
        this.viewport.setYOffset(Math.max(0, this.roomsCursor - mid))
        return
      }
      var lines = []
      for (var i = 0; i < buf.lines.length; i++) {
        var rec = buf.lines[i]
        var clock = bareIrcFmtClock(rec.atMs)
        if (rec.kind === 'action') {
          lines.push(clock + ' * ' + rec.from + ' ' + rec.text)
        } else if (rec.kind === 'notice') {
          lines.push(clock + ' -' + rec.from + '- ' + rec.text)
        } else if (rec.kind === 'privmsg') {
          lines.push(clock + ' <' + rec.from + '> ' + rec.text)
        } else {
          lines.push(clock + ' ' + (rec.text || rec.command || ''))
        }
      }
      this.viewport.setContent(lines.join('\n'))
      this.viewport.gotoBottom()
    },
    _nextBuffer: function (dir) {
      var list = bareIrcListBuffers(this.client.state)
      if (!list.length) return
      var cur = 0
      for (var i = 0; i < list.length; i++) {
        if (list[i].id === this.client.state.currentId) cur = i
      }
      var n = (cur + dir + list.length) % list.length
      this.client.state.currentId = list[n].id
      this._sync()
    },
    _completeNick: function () {
      var buf = this._current()
      var val = this.input.value || ''
      var m = /(?:^|\s)(\S+)$/.exec(val)
      var prefix = m ? m[1] : ''
      if (!prefix) return
      var mapping = bareIrcCasemapping(this.client.state.isupport)
      var keys = Object.keys(buf.members || {})
      var hit = ''
      for (var i = 0; i < keys.length; i++) {
        var mem = buf.members[keys[i]]
        var nick = mem && mem.nick ? mem.nick : keys[i]
        if (
          bareIrcCasemap(nick, mapping).indexOf(
            bareIrcCasemap(prefix, mapping)
          ) === 0
        ) {
          hit = nick
          break
        }
      }
      if (!hit) return
      this.input.setValue(val.slice(0, val.length - prefix.length) + hit)
    },
    _applySlash: function (res) {
      var buf = this._current()
      if (res.help) this.help = true
      if (res.rooms) this._openRooms(res.roomsQuery || '')
      if (res.note) {
        bareIrcPushLine(this.client.state, buf, {
          atMs: Date.now(),
          kind: 'info',
          text: res.note
        })
      }
      if (res.usage) {
        bareIrcPushLine(this.client.state, buf, {
          atMs: Date.now(),
          kind: 'info',
          text: res.usage
        })
      }
      if (res.clear && buf) buf.lines = []
      if (res.close) {
        if (buf.kind === 'channel') this.client.part(buf.name, '')
        var id = buf.id
        if (id !== 'server') {
          delete this.client.state.buffers[id]
          this.client.state.currentId = 'server'
        }
      }
      if (res.quit) return tui.quit
      this._sync()
      return null
    },
    _runSlash: function (line) {
      var self = this
      var res = bareIrcRunSlash(this.client, line, {
        buf: this._current(),
        ctx: ctx,
        reconnect: function () {
          try {
            if (self.client.opts) {
              self.client.attach(bareIrcDial(ctx, self.client.opts))
              self.status = 'reconnecting\u2026'
            }
          } catch (err) {
            self.status = 'reconnect failed'
          }
        }
      })
      return this._applySlash(res)
    },
    update: function (msg) {
      if (msg && msg.type === 'resize') {
        this.width = msg.width || this.width
        this.height = msg.height || this.height
        this._sync()
        return [this, null]
      }
      if (msg && msg.type === 'irc.paint') {
        this.status = this.client.state.registered
          ? this.client.state.saslOk
            ? 'sasl ok'
            : 'registered'
          : this.client.state.connection
        this._sync()
        return [this, null]
      }
      if (this.help) {
        if (msg && msg.type === 'key') this.help = false
        return [this, null]
      }
      if (this.roomsOpen) {
        if (this.roomsFilterEdit) {
          if (tui.key.matches(msg, 'escape')) {
            this.roomsFilterEdit = false
            this.input.reset()
            return [this, null]
          }
          if (tui.key.matches(msg, 'enter')) {
            var q = String(this.input.value || '').trim()
            this.input.reset()
            this.roomsFilterEdit = false
            if (q) this.client.list(q)
            this.status = q ? 'listing ' + q : 'rooms'
            this._sync()
            return [this, null]
          }
          var rpair = this.input.update(msg)
          this.input = rpair[0]
          return [this, rpair[1]]
        }
        if (tui.key.matches(msg, 'escape', 'q')) {
          this.roomsOpen = false
          this._sync()
          return [this, null]
        }
        if (tui.key.matches(msg, '/', 'f')) {
          this.roomsFilterEdit = true
          this.input.reset()
          return [this, null]
        }
        if (tui.key.matches(msg, 'enter')) {
          this._joinRoomAtCursor()
          this._sync()
          return [this, null]
        }
        if (tui.key.matches(msg, 'j', 'down')) {
          this.roomsCursor++
          this._sync()
          return [this, null]
        }
        if (tui.key.matches(msg, 'k', 'up')) {
          this.roomsCursor = Math.max(0, this.roomsCursor - 1)
          this._sync()
          return [this, null]
        }
        if (tui.key.matches(msg, 'pageup', 'pagedown')) {
          var step = this.viewport.height || 10
          if (tui.key.matches(msg, 'pageup'))
            this.roomsCursor = Math.max(0, this.roomsCursor - step)
          else this.roomsCursor += step
          this._sync()
          return [this, null]
        }
      }
      if (this.quitConfirm) {
        if (tui.key.matches(msg, 'y', 'Y')) {
          this.client.quit('Quit')
          return [this, tui.quit]
        }
        if (msg && msg.type === 'key') this.quitConfirm = false
        return [this, null]
      }
      if (tui.key.matches(msg, 'ctrl+c')) {
        this.quitConfirm = true
        return [this, null]
      }
      if (tui.key.matches(msg, 'f10')) {
        this.client.quit('Quit')
        return [this, tui.quit]
      }
      if (tui.key.matches(msg, '?')) {
        this.help = true
        return [this, null]
      }
      if (tui.key.matches(msg, 'ctrl+l')) {
        this._openRooms('')
        this._sync()
        return [this, null]
      }
      if (tui.key.matches(msg, 'ctrl+n', 'alt+right')) {
        this._nextBuffer(1)
        return [this, null]
      }
      if (tui.key.matches(msg, 'ctrl+p', 'alt+left')) {
        this._nextBuffer(-1)
        return [this, null]
      }
      if (tui.key.matches(msg, 'tab')) {
        this._completeNick()
        return [this, null]
      }
      if (tui.key.matches(msg, 'pageup', 'pagedown', 'up', 'down')) {
        var vp = this.viewport.update(msg)
        this.viewport = vp[0]
        return [this, vp[1]]
      }
      if (tui.key.matches(msg, 'enter')) {
        var line = String(this.input.value || '').trim()
        this.input.reset()
        if (!line) return [this, null]
        if (line.charAt(0) === '/') {
          var cmd = this._runSlash(line)
          return [this, cmd]
        }
        var cur = this._current()
        if (cur.kind === 'server') {
          bareIrcPushLine(this.client.state, cur, {
            atMs: Date.now(),
            kind: 'info',
            text: 'join a channel or /query someone first'
          })
        } else if (cur.kind === 'p2p') {
          bareIrcPushLine(this.client.state, cur, {
            atMs: Date.now(),
            kind: 'privmsg',
            from: this.client.state.nick || 'me',
            text: line,
            local: true
          })
          if (typeof ctx.bareOsChatSend === 'function') {
            try {
              ctx.bareOsChatSend(
                '[bare-os-irc-shadow] ' + cur.name + ' ' + line
              )
            } catch (e) {
              /* ignore */
            }
          }
        } else {
          this.client.sendPrivmsg(cur.name, line)
        }
        this._sync()
        return [this, null]
      }
      var pair = this.input.update(msg)
      this.input = pair[0]
      return [this, pair[1]]
    },
    view: function () {
      var cols = Math.max(40, this.width || 80)
      var rows = Math.max(12, this.height || 24)
      var st = tui.style
      var buf = this._current()
      var net = this.client.state.network || 'irc'
      var tls = this.client.state.tls ? 'tls' : 'plain'
      var titleRaw =
        ' ' +
        net +
        '  ' +
        buf.name +
        (buf.unread ? ' ● ' + buf.unread : '') +
        '  ' +
        tls +
        (this.client.state.saslOk ? '  sasl' : '') +
        '  ' +
        this.status +
        '  ' +
        cols +
        'x' +
        rows +
        ' '
      var title = st
        ? st()
            .foreground('brightwhite')
            .background('blue')
            .width(cols)
            .render(titleRaw)
        : titleRaw
      var tabs = bareIrcListBuffers(this.client.state)
        .map(function (b) {
          var mark = b.id === buf.id ? '[' + b.name + ']' : b.name
          if (b.unread) mark += '(' + b.unread + ')'
          return mark
        })
        .join('  ')
      var tabBar = st ? st().dim().width(cols).render(tabs) : tabs
      var nickW = bareIrcNickColWidth(cols, buf, this.roomsOpen)
      var bodyH = this.viewport.height || Math.max(4, rows - 6)
      var body = this.viewport.view()
      if (nickW && buf.kind === 'channel') {
        var keys = Object.keys(buf.members || {})
        keys.sort(function (a, b) {
          var ma = buf.members[a]
          var mb = buf.members[b]
          var pa = ma && ma.modes && ma.modes.indexOf('o') >= 0 ? 0 : 1
          var pb = mb && mb.modes && mb.modes.indexOf('o') >= 0 ? 0 : 1
          if (pa !== pb) return pa - pb
          var na = ma && ma.nick ? ma.nick : a
          var nb = mb && mb.nick ? mb.nick : b
          return na < nb ? -1 : na > nb ? 1 : 0
        })
        var nicks = keys.map(function (k) {
          return bareIrcMemberLabel(buf.members[k], k)
        })
        var left = String(body).split('\n')
        var chatW = Math.max(8, cols - nickW - 1)
        var joined = []
        var r
        for (r = 0; r < bodyH; r++) {
          var L = bareIrcPad(
            st ? st.truncate(left[r] || '', chatW) : left[r] || '',
            chatW
          )
          var R = bareIrcPad(nicks[r] || '', nickW)
          joined.push(L + '\u2502' + R)
        }
        body = joined.join('\n')
      }
      var prompt
      if (this.roomsOpen && this.roomsFilterEdit) {
        prompt =
          'Filter: ' +
          (this.input.view ? this.input.view() : this.input.value || '')
      } else {
        prompt =
          (buf.kind === 'p2p' ? '#p2p ' : '') +
          '[' +
          (this.roomsOpen ? 'rooms' : buf.name) +
          '] ' +
          (this.input.view ? this.input.view() : this.input.value || '')
      }
      var footRaw = this.roomsOpen
        ? this.roomsFilterEdit
          ? 'Filter + Enter search LIST   Esc back'
          : 'Enter join  j/k move  / filter  Esc close  featured or /rooms linux'
        : 'Enter send  /rooms  /join  /query  Ctrl+L rooms  Ctrl+n/p  Tab nick  ?'
      var foot = st ? st().dim().width(cols).render(footRaw) : footRaw
      var rule = st
        ? st()
            .dim()
            .width(cols)
            .render('\u2500'.repeat(Math.min(cols, 120)))
        : ''
      var lines = [title, tabBar, rule]
        .concat(String(body).split('\n'))
        .concat([rule, prompt, foot])
      while (lines.length < rows) lines.push('')
      var out = []
      for (var i = 0; i < rows; i++) {
        out.push(
          st
            ? st.truncate(lines[i] || '', cols)
            : String(lines[i] || '').slice(0, cols)
        )
      }
      return out.join('\n')
    },
    overlay: function (size) {
      if (!this.help && !this.quitConfirm) return null
      var cols = (size && size.width) || this.width || 80
      var rows = (size && size.height) || this.height || 24
      var st = tui.style
      var body = this.quitConfirm
        ? 'Disconnect and quit?\n\nY yes   any other key cancel'
        : 'Bare OS irc\n\n' +
          '/rooms [pat]  browse/list   /join #chan   /part  /query nick\n' +
          '/msg /notice /me /nick /whois /whowas /who /names /topic\n' +
          '/kick /invite /op /deop /voice /mode /ban /away /back\n' +
          '/list /motd /quote /ctcp /ping /ignore /clear /close /quit\n' +
          '/p2p open #chan   shadow room (not Libera)\n' +
          'Ctrl+L rooms   Ctrl+n/p buffers   Tab nick\n\n' +
          'Default: irc.libera.chat:6697 TLS   random nick if unset\n' +
          'Press any key to close.'
      var boxed = st
        ? st()
            .border(st.borders.rounded)
            .padding(1, 2)
            .background('black')
            .render(body)
        : body
      var h = st ? st.height(boxed) : boxed.split('\n').length
      var w = st ? st.width(boxed) : 48
      return {
        row: Math.max(0, Math.floor((rows - h) / 2)),
        col: Math.max(0, Math.floor((cols - w) / 2)),
        text: boxed
      }
    }
  }
}

function bareIrcTuiRunOpts() {
  return { buffer: 'cell' }
}