#
#
#
import re
import json
import sqlite3

delimeter = "|"


def scanDB(filein):
  # try to open sqlite file
  try:
    (conn, cur) = __openDB(filein)
  except Exception, e:
    return -2

  # read database schema
  try:
    dbSchema = DBSchema()
    dbSchema.readDatabase(cur)
  except Exception, e:
    print e
    return -3

  return 1


def __openDB(filein):
  conn = sqlite3.connect(filein)
  cur = conn.cursor()
  return (conn, cur)


def writeFingerprint():
  return


def printDB():
  return

def getErrorString(errorCode):
  retval = "ERROR: unknown error code: " + str(errorCode)
  if (errorCode == -2):
    retval = "ERROR: problem opening file, or not sqlite database"
  elif (errorCode == -3):
    retval = "ERROR: problem reading database"
  return retval


#
# Database Schema
#
class DBSchema:
  """
  This class represents a complete database schema
  """

  sqlmaster = "SELECT name, sql FROM sqlite_master WHERE type='table'"

  def __init__(self):
    self.tableNames = []
    self.tables = {}
    return

  def readDatabase(self, cur):
    for row in cur.execute(self.sqlmaster):
      newTable = TableDefinition()
      newTable.loadTable(row[0], row[1])
      self.tableNames.append(newTable.name())
      self.tables[newTable.name()] = newTable
    return


#
#
#
class TableDefinition:
  """
  This class represents the definition of database table
  """

  tableschemaregex = r'\((.*)\)'


  def __init__(self):
    self.tableName = ""
    self.sqlStr    = ""
    self.fields    = {}
    # self.pkeys     = []
    return

  def loadTable(self, tableName, sqlStr):
    self.tableName = tableName
    self.sqlStr = sqlStr
    results = re.search(self.tableschemaregex, sqlStr)
    if results:
      colstr = results.group(1)
      print "[[ TABLE: <" + tableName + "> ]]"
      print "FIELDS: " + colstr
      columns = colstr.split(',')
      for col in columns:
        newField = self.__parseCreateStr(col.strip())
        if newField:
          self.fields[newField['name']] = newField

    return


  # Table Definition
  #
  #  CREATE TABLE contacts (_id INTEGER PRIMARY KEY AUTOINCREMENT,name_raw_contact_id INTEGER REFERENCES raw_contacts(_id),
  #      photo_id INTEGER REFERENCES data(_id),photo_file_id INTEGER REFERENCES photo_files(_id),
  #      custom_ringtone TEXT,send_to_voicemail INTEGER NOT NULL DEFAULT 0,
  #      times_contacted INTEGER NOT NULL DEFAULT 0,last_time_contacted INTEGER,
  #      starred INTEGER NOT NULL DEFAULT 0,pinned INTEGER NOT NULL DEFAULT 2147483647,
  #      has_phone_number INTEGER NOT NULL DEFAULT 0,lookup TEXT,
  #      status_update_id INTEGER REFERENCES data(_id),contact_last_updated_timestamp INTEGER)
  #
  #  CREATE TABLE sent_files_v2 (uid INTEGER, phone TEXT, sphone TEXT, deleted INTEGER, 
  #                              PRIMARY KEY (uid, phone)
  def __parseCreateStr(self, sqltext):
    try:
      newField = {}
      #                     photo_id INTEGER REFERENCES data(_id)
      #                     name_raw_contact_id INTEGER REFERENCES raw_contacts(_id)
      results = re.match(r'(\w+)\s+(\w+)\s+REFERENCESS\s+(\W+)', sqltext)
      if results:
        newField['name'] = results.group(1)
        newField['datatype'] = results.group(2)
        newField['references'] = 1
        newField['referencesdata'] = results.group(3)
        return newField
      #                     pinned INTEGER NOT NULL DEFAULT 2147483647
      #                     send_to_voicemail INTEGER NOT NULL DEFAULT 0
      results = re.match(r'(\w+)\s+(\w+)\s+NOT NULL\s+DEFAULT\s+(\w+)', sqltext)
      if results:
        newField['name'] = results.group(1)
        newField['datatype'] = results.group(2)
        newField['notnull'] = True
        newField['default'] = results.group(3)
        return newField
      #                     _id INTEGER PRIMARY KEY AUTOINCREMENT
      results = re.match(r'(\w+)\s+(\w+)\s+PRIMARY KEY\s+AUTOINCREMENT', sqltext)
      if results:
        newField['name'] = results.group(1)
        newField['datatype'] = results.group(2)
        newField['primarykey'] = True
        newField['autoincrement'] = True
        return newField
      #                     FileID INTEGER NOT NULL
      results = re.match(r'(\w+)\s+(\w+)\s+NOT NULL', sqltext)
      if results:
        newField['name'] = results.group(1)
        newField['datatype'] = results.group(2)
        newField['notnull'] = True
        return newField
      #                     custom_ringtone TEXT
      results = re.match(r'(\w+)\s+(\w+)', sqltext)
      if results:
        newField['name'] = results.group(1)
        newField['datatype'] = results.group(2)
        return newField
      #                     PRIMARY KEY (field_name, 
      results = re.match(r'PRIMARY KEY \((\w+)\,', sqltext)
      if results:
        field = self.fields[results.group(1)]
        field['primarykey'] = True
        return False
      #                     field_name)
      results = re.match(r'(\w+)\)', sqltext)
      if results:
        field = self.fields[results.group(1)]
        field['primarykey'] = True
        return False

      print 'INFO: field definition not recognized: "' + sqltext + '"'
      #                     photo_id INTEGER REFERENCES data(_id)
      # results = re.match(r'', sqltext)
      # if results:
      #   newField['name'] = results.group(1)
      #   newField['datatype'] = results.group(2)
      #   return newField
    except Exception, e:
      return None

    return None


  def toJSON(self):



  def __str__(self):
    global delimeter
    retstr = ""

    return retstr    

  def name(self):
    return self.tableName



class TableField:

  def __init__(self):
    return