#!/usr/bin/python
    
import json
import os
import time
import copy

CONFIGFILEVERSION="1.0"

class ClockyConfig:
    """Read/write clocky config files."""

    def __init__(self,filename,verbose=0):
        """Open existing Clocky config file and read config data. If no file can be found create a new one with default values."""
        self.filename=filename
        self.__verbose=verbose
        if os.access(self.filename,os.R_OK):
          self.__Read()
            
        else:
          self.__data={}
          self.__data["clocky"]={}
          self.__data["clocky"]["CONFIGFILEVERSION"]=CONFIGFILEVERSION

          self.__data["clocky"]["settings"]={}
          self.__data["clocky"]["settings"]["alarmtime"]="9:00"
          self.__data["clocky"]["settings"]["alarmdisabled"]=0
          self.__data["clocky"]["settings"]["maxalarmtime"]=30
          self.__data["clocky"]["settings"]["snoozetime"]=9
          self.__data["clocky"]["settings"]["playmode"]="random"

          self.__data["clocky"]["tracks"]={}
          self.__data["clocky"]["starttrack"]=0
          self.__data["clocky"]["tracklist"]=[]
          self.__data["clocky"]["tracksequence"]=[]

          self.__Write()

          if(self.__verbose):
            print("Created new config file called \"%s\"" %self.filename)
                  
                  
    def __Read(self):
        """Internal function to do the actual reading of file in to config"""
        with open(self.filename) as json_data_file:
            self.__data = json.load(json_data_file)
        if(self.__data["clocky"]["version"] != CONFIGFILEVERSION):
            print ("ERROR: configfile \""+self.filename+"\" CONFIGFILEVERSION ("+self.__data["clocky"]["version"]+") does not match program CONFIGFILEVERSION ("+CONFIGFILEVERSION+")!")
            exit();
        self.__readdata=copy.deepcopy(self.__data)
        self.__timestamp=os.stat(self.filename).st_mtime

        self.settings=self.__data["clocky"]["settings"]
        self.starttrack=self.__data["clocky"]["starttrack"]
        self.tracklist=self.__data["clocky"]["tracklist"]
        self.sequence=self.__data["clocky"]["tracksequence"]
      
    def __Write(self):
        """Internal function to do the actual writing of data into file"""
        with open(self.filename,"w") as json_data_file:
            json.dump(self.__data,json_data_file)
        self.__readdata=copy.deepcopy(self.__data)
        self.__timestamp=os.stat(self.filename).st_mtime

        self.settings=self.__data["clocky"]["settings"]
        self.starttrack=self.__data["clocky"]["starttrack"]
        self.tracklist=self.__data["clocky"]["tracklist"]
        self.sequence=self.__data["clocky"]["tracksequence"]


    def Print(self):
        """Print current config data in human readable format"""
        print("--ClockyConfig-------------")
        print("filename      =",self.filename)
        print("CONFIGFILEVERSION       =",self.__data["clocky"]["version"])
        for x in self.__data["clocky"]["settings"].keys():
            print("%-14s= %s" %(x,self.__data["clocky"]["settings"][x]))
        print("...........................")
        print("starttrack    =",self.__data["clocky"]["starttrack"])
        nrtracks=len(self.__data["clocky"]["tracklist"])
        print ("%d Tracks:" %nrtracks)
        for str in self.__data["clocky"]["tracklist"]:
            print("    "+str)
        print("%d sequence items:" %(len(self.__data["clocky"]["tracksequence"])) )
        for num in self.__data["clocky"]["tracksequence"]:
            if num<nrtracks:
                print("    %d -> %s" %(num,self.__data["clocky"]["tracklist"][num]) )
            else:
                print("    %d UNKNOWN TRACK" %num)
        print("---------------------------")

    def Dump(self):
      """Dump current config data in json format"""
      print(self.__data)

    def CheckConfig(self):
      """Check if config file has changed or removed since reading, or if the settings have changed.
      Re-write or Re-read when necessary"""
      if not os.access(self.filename,os.R_OK):
        self.__Write()
        if(self.__verbose):
          print("Re-write settings because of file removal!")
          self.Print()

      elif(os.stat(self.filename).st_mtime != self.__timestamp):
        self.__Read()
        if(self.__verbose):
          print("Re-read settings because of config file change!")
          self.Print()
        
      if(self.__data != self.__readdata):
        self.__Write()
        if(self.__verbose):
          print("Re-write settings because of settings change!")
          self.Print()