var blessed = require('blessed')
var moment = require('moment')

module.exports = function(data){
  // Contacts holds all the contacts data
  data.contacts = { }
  // Groups hold all the data about groups
  data.groups = { }
  // unameToUid is used to match a name to its user id
  data.unameToUid = { }
  // same thing for group name -> group object
  data.gnameToGid = { }
  data.user = { } // holds data about current user
  data.state = { } // keeps track of the telegram update state

  data.updateLastKnownAction = function(){
    data.lastKnownAction = moment()
    data.user.offline = false
  }

  data.addUser = function(u){
    if(!data.user || !data.user.id) return log("Can't add invalid user object to contacts",u)
    var wasOnline,online = false
    data.contacts[u.id] = { user: u, id: u.id, online: online }
    var name = data.getName(u.id,'user')
    data.unameToUid[name] = u.id
    data.updateOnlineStatus(u.id,u.status)
    data.rebuildChatList()
    //data.log(u.toPrintable())
  }

  data.updateOnlineStatus = function(id,s){
    if(s.instanceOf('api.type.UserStatusOffline')){
      data.contacts[id].online_expires = moment.unix(s.was_online)
    } else if(s.instanceOf('api.type.UserStatusOnline')){
      data.contacts[id].online_expires = moment.unix(s.expires)
      data.log('Online status for',data.getName(id,'user'),'expires',data.contacts[id].online_expires.fromNow())
    }
  }

  data.addGroup = function(group){
    if(data.groups[group.id]){
      if(group.title && group.title != data.groups[group.id].title){
        // Update title
        var old = data.groups[group.id].title
        data.groups[group.id].title = group.title
        data.chats.getItem(old).content = group.title
        data.screen.render()
        data.gnameToGid[old] = undefined
        return
      }
    }
    data.log(group.toPrintable())
    if(group.left === true) return;
    if(group.title === undefined){
      if(!isNaN(group)){ // Is ID
        data.groups[group] = { id: group, title: group }
      } else {
        var t = group.toPrintable ? group.toPrintable() : group
        data.log('Undefined group title in group ',group.toPrintable())
      }
    } else {
      data.groups[group.id] = { id: group.id, title: group.title, group: group }
      data.gnameToGid[group.title] = group.id
    }
    data.rebuildChatList()
  }

  data.rebuildChatList = function(){
    var list = []
    for(c in data.contacts) list.push(data.contacts[c])
    for(c in data.groups) list.push(data.groups[c])
    function cmpstr(a,b){
      return data.getName(a.id,a.title?'group':'user').localeCompare(data.getName(b.id,b.title?'group':'user'))
    }
    list.sort(function(a,b){
      if(a.toread > 0 && b.toread > 0){
        var diff = a.toread - b.toread
        if(diff == 0) return cmpstr(a,b)
        return diff
      }
      if(a.toread > 0) return -1
      if(b.toread > 0) return 1
      return cmpstr(a,b)
    })
    data.chats.setItems(list.map(function(item){
      var n = data.getName(item.id,item.title?'group':'user','chatlist')
      if(n === undefined || n === null || !n || (n.trim && !n.trim()))
        data.log('Empty list item:',JSON.stringify(item))
      return n
    }))
    if(!data.chats.focused == data.screen.focused) data.chats.setScrollPerc(0)
    //data.chats.select(data.selectedWindow)
    data.screen.render()
  }

  data.markAsRead = function(name){
    var obj = data.nameToObj(name)
    if(obj === undefined) return
    obj.toread = 0
    data.rebuildChatList()
    if(data.markingAsRead){
      return // we don't want 2339238 requests
    }
    var maxid = obj.latest_message || 0
    if(obj.latest_read_message > maxid) return // already read them messages
    data.latest_read_message = maxid
    data.markingAsRead = true
    data.client.messages.readHistory(data.idToPeer(obj.id,obj.title?'group':'user'),maxid,0,true,function(res){
      data.log('Done reading history:',res.toPrintable())
      data.markingAsRead = false
    })
  }

  // Updates the current state
  data.updateState = function(newstate){
    data.state.pts = newstate.pts || data.state.pts
    data.state.qts = newstate.qts || data.state.qts
    data.state.date = newstate.date || data.state.date
    data.state.sqp = newstate.seq || data.state.sqp
    data.state.unreadCount = newstate.unread_count || data.state.unreadCount || 0
  }

  data.getName = function(id,type,f){
    var name,obj,toread,online_expires
    if(type === undefined) throw new Error('no type')
    else if(id === data.user.id){
      obj = data.user
    } else if(type === 'group' && data.groups[id]) {
      obj = data.groups[id]
      toread = obj.toread
    } else if(type === 'user' && data.contacts[id]) {
      obj = data.contacts[id].user
      toread = data.contacts[id].toread
      online_expires = data.contacts[id].online_expires
    } else data.log('Failed to find name for',type,id)
    if(obj === undefined){
      name = 'Unknown '+type+' '+id
    } else if(type === 'user'){
      // User
      if(obj.first_name === undefined && obj.last_name === undefined && obj.username === undefined){
        data.log('Zombie User: '+obj)
        return 'undefined'
      }
      name = obj.first_name + (obj.last_name?' '+obj.last_name:'') + (obj.username?' {grey-fg}@'+obj.username+'{/grey-fg}':'')
    } else { // Group
      name = '{blue-fg}'+obj.title+'{/blue-fg}'
    }
    if(f === 'chatlist'){
      if(toread > 0) name = '* '+name
      if(online_expires && moment().isBefore(online_expires))
        name = '{green-fg}'+name+'{/green-fg}'
    } else if(f === 'statusbar'){
      if(toread > 0) name = name + ' (' + toread + ')'
      if(online_expires)
        if(moment().isBefore(online_expires))
          name = name + '{|}{green-fg}Online{/green-fg}'
        else name = name + '{|}Last Seen: '+moment(online_expires).fromNow()
    } else if(f === 'label'){
      name = 'to ' + name
    }
    if(f) return name
    return blessed.cleanTags(name)
  }

  data.escapeFromList = function(txt){
    return blessed.stripTags(txt.text || txt.content || String(text)).replace('* ','')
  }

  data.nameToObj = function(name){
    var id = data.gnameToGid[name]
    if(data.groups[id] && data.groups[id].title === name)
      return data.groups[id]
    else {
      id = data.unameToUid[name]
      return data.contacts[id]
    }
  }

  data.idToPeer = function(uid,type){
    if(type === 'user')
      return new data.telegramLink.type.InputPeerContact({ props: { user_id: ''+uid } })
    else if(type === 'group')
      return new data.telegramLink.type.InputPeerChat({ props: { chat_id: ''+uid } })
  }

  data.quit = function(){
    if(data.connected || data.client != undefined){
      data.log('Closing communications and shutting down...')
      data.client.end(function(){
        process.exit(0)
      })
    } else process.exit(0);
  }
}