#!/usr/bin/python
#
#
#  8/9/2014  David Lawrence
#
#
# This script will modify a tt.db file to use the correct fADC channel numbers
# for the FDC cathode strips in connectors attached to strip type "B" strips.
# This corrects a mistake built into the tt_fix_fdc_strip_no.py script. This should
# be run after that is run. The issue is that the connector for "B" type strips
# actually has them attached in reverse order since it is on the opposite side 
# of the plane and therefore rotated 180 degrees wrt the other connectors. Oddly
# enough, the original tt.db had these strips in the correct order, but they were
# changed along with all of the other strips in tt_fix_fdc_strip_no.py. The correct
# final mapping for "B" type strip should be:
# 
#    48 <= channel <= 71     85 >= strip >= 108
#
# All "A" type and "full" type strips should have the strip number increasing as
# the channel number decreases.
#



import sqlite3 as lite
import sys
import os
import re
import datetime


if len(sys.argv) != 2:
	print "You must supply a SQLite DB file to modify!"
	sys.exit(0);

# Connect to SQLite DB file
db_filename = sys.argv[1]
print ""
print "opening SQLite DB file: %s" % db_filename
print "---------------------------------------------"
con = lite.connect(db_filename)

with con:

	# Specify that next cursor should be "dictionary"
	# (i.e. python's hash map) so columns can be indexed
	# by name
	con.row_factory = lite.Row

	# Create Cursor
	cur = con.cursor()
	
	# Check that this TT file has not already been updated
	sql = 'SELECT strip,channel FROM Channel,FDC_Cathodes WHERE chanid=adc_chanid AND strip_type="B" AND strip=85 AND channel=71'
	cur.execute(sql)
	s_rows = cur.fetchall()
	if len(s_rows) != 48:
		print 'This file may have already been updated. Expected 48 rows from the following'
		print 'query, but got %d' % len(s_rows)
		print '\n%s\n' % sql
		sys.exit(-1)
	
	# Correct channels 0-23
	print 'updating channels for "B" type strips ...'
	subselect = 'SELECT adc_chanid FROM Channel,FDC_Cathodes WHERE chanid=adc_chanid AND strip_type="B" AND (channel BETWEEN 48 AND 71)'
	sql = 'UPDATE Channel SET channel=(71-channel+48) WHERE chanid IN (%s)' % subselect
	cur.execute(sql)

	print 'Done'