#!/usr/bin/env python3

import tools

import sys, datetime

def getDate(date):
 try:
  return datetime.datetime.strptime(date, '%Y-%m-%d')
 except ValueError:
  raise ValueError("Dates must be in YYYY-MM-DD format.")

def dateArgs(argv = sys.argv[1:]):
 strings = []
 fr = None
 to = None
 av = 0

 mode = 0

 for arg in argv:
  if mode == 0 or (mode == 3 and not isinstance(arg,int)):
   if arg == "-f":
    mode = 1
   elif arg == "-t":
    mode = 2
   elif arg == "-a":
    mode = 3
   else:
    strings += [arg]
    mode = 0
  elif mode == 3:
   av = arg
   mode = 0
  elif mode == 1:
    fr = getDate(arg)
    mode = 0
  else:
    to = getDate(arg)
    mode = 0

 if mode in (1, 2):
  raise ValueError("Date missing.")

 if to != None and fr != None and to < fr:
  raise ValueError("From date must be before To date.")
 
 return strings, fr, to, av
    

def queryBuilder(date, string = ""):
 return "SELECT COUNT(*) FROM tweets WHERE SUBSTR(timestamp,0,11) = '%s' AND LOWER(text) LIKE '%%%s%%'" % (date, string)


def getFLDate(db, val = 0):
 if val == 0:
  mode = "MIN"
 else:
  mode = "MAX"

 return getDate(str(db.executeQuery("SELECT %s(SUBSTR(timestamp,0,11)) FROM tweets" % mode)[0][0]))


def dateList(fr, to):
 return [[(fr+datetime.timedelta(days=i)).strftime('%Y-%m-%d')] for i in range((to+datetime.timedelta(days=1)-fr).days)]


def fillList(db, string, cur, av):
 for day in cur:
  day += db.executeQuery(queryBuilder(day[0], string))[0]

 return cur


def getHeaders(strings, av):
 return [["Date", "Tweets"] + [string for string in strings]]


def getTweetsByDate(strings = [], fr = None, to = None, av = 0, path = tools.config.dbpath, headers = False):
 db = tools.dbHelper(path)

 if fr == None:
  fr = getFLDate(db)
 if to == None:
  to = getFLDate(db, 1)

 cur = dateList(fr, to)

 for string in [""] + strings:
  cur = fillList(db, string, cur, av)

 if headers:
  cur = getHeaders(strings, av) + cur

 return cur

if __name__ == "__main__":
 tools.printCSV(getTweetsByDate(*dateArgs(), headers = True))