#!/usr/bin/env python3
import subprocess
import time
import os
from RRD import RRD, DS, RRA

class rrd:
  def __init__( self
              , databaseDirectory
              , imagePath
              , displayTimeGlobal = "7d"
              , displayTimeNode = "1d"
              ):
    self.dbPath = databaseDirectory
    self.globalDb = RRD(databaseDirectory + "/nodes.rrd")
    self.imagePath = imagePath
    self.displayTimeGlobal = displayTimeGlobal
    self.displayTimeNode = displayTimeNode

    self.currentTimeInt = (int(time.time())/60)*60
    self.currentTime    = str(self.currentTimeInt)

    try:
      os.stat(self.imagePath)
    except:
      os.mkdir(self.imagePath)

  def updateGlobalDatabase(self,nodeCount,clientCount):
    """ Adds a new (#Nodes,#Clients) entry to the global database.
    """
    self.globalDb.ensureSanity(
      [
        # Number of nodes available
        DS('nodes', 'GAUGE', 120, 0, float('NaN')),
        # Number of client available
        DS('clients', 'GAUGE', 120, 0, float('NaN')),
      ], [
        RRA('LAST', 0, 1, 44640),
        RRA('LAST', 0, 60, 744),
        RRA('LAST', 0, 1440, 1780),
      ],
      step=60,
    )
    self.globalDb.update({'nodes': nodeCount, 'clients': clientCount})

  def createGlobalGraph(self):
    nodeGraph = self.imagePath + "/" + "globalGraph.png"
    args = ["rrdtool", 'graph', nodeGraph, '-s', '-' + self.displayTimeGlobal, '-w', '800', '-h' '400'
           ,'DEF:nodes=' + self.globalDb.filename + ':nodes:AVERAGE', 'LINE1:nodes#F00:nodes\\l'
           ,'DEF:clients=' + self.globalDb.filename + ':clients:AVERAGE','LINE2:clients#00F:clients'
           ]
    subprocess.check_output(args)


  def nodeMACToRRDFile(self,nodeMAC):
    return self.dbPath + "/" + str(nodeMAC).replace(":","") + ".rrd"

  def nodeMACToPNGFile(self,nodeMAC):
    return self.imagePath + "/" + str(nodeMAC).replace(":","") + ".png"

  # Call only if node is up
  def updateNodeDatabase(self,nodePrimaryMAC,clientCount):
    # TODO check for bad nodeNames
    nodeFile = self.nodeMACToRRDFile(nodePrimaryMAC)
    nodeRRD = RRD(nodeFile)
    nodeRRD.ensureSanity(
      [
        DS('upstate', 'GAUGE', 120, 0, 1),
        DS('clients', 'GAUGE', 120, 0, float('NaN')),
      ], [
        RRA('LAST', 0, 1, 44640),
      ],
      step=60,
    )
    # Update Global RRDatabase
    args =  ["rrdtool",'updatev', nodeFile
            # #Upstate #Clients
            , self.currentTime + ":"+str(1)+":"+str(clientCount)
            ]
    subprocess.check_output(args)

  def createNodeGraph(self,nodePrimaryMAC):
    nodeGraph = self.nodeMACToPNGFile(nodePrimaryMAC)
    nodeFile  = self.nodeMACToRRDFile(nodePrimaryMAC)
    args = ['rrdtool','graph', nodeGraph, '-s', '-' + self.displayTimeNode , '-w', '800', '-h', '400', '-l', '0', '-y', '1:1',
            'DEF:clients=' + nodeFile + ':clients:AVERAGE',
            'VDEF:maxc=clients,MAXIMUM',
            'CDEF:c=0,clients,ADDNAN',
            'CDEF:d=clients,UN,maxc,UN,1,maxc,IF,*',
            'AREA:c#0F0:up\\l',
            'AREA:d#F00:down\\l',
            'LINE1:c#00F:clients connected\\l',
            ]
    subprocess.check_output(args)

  def update_database(self,db):
    nodes = {}
    clientCount = 0
    for node in db.get_nodes():
      if node.flags['online']:
        if not node.flags['client']:
          nodes[node.id] = node
          node.clients = 0;
          if 'legacy' in node.flags and node.flags['legacy']:
            clientCount -= 1
        else:
          clientCount += 1
    for link in db.get_links():
      source = link.source.interface
      target = link.target.interface
      if source in nodes and not target in nodes:
        nodes[source].clients += 1
      elif target in nodes and not source in nodes:
        nodes[target].clients += 1

    self.updateGlobalDatabase(len(nodes),clientCount)
    for mac in nodes:
      self.updateNodeDatabase(mac,nodes[mac].clients)

  def update_images(self):
    """ Creates a image for every rrd file in the database directory.
    """

    self.createGlobalGraph()

    nodeDbFiles = os.listdir(self.dbPath)

    for fileName in nodeDbFiles:
      if not os.path.isfile(os.path.join(self.dbPath, fileName)):
        continue

      nodeName = os.path.basename(fileName).split('.')
      if nodeName[1] == 'rrd' and not nodeName[0] == "nodes":
        self.createNodeGraph(nodeName[0])