#!/usr/bin/env python

# Transforms a map spreadsheet to use a different root

import csv

import os.path

import sys

sys.path.append(os.path.dirname(__file__)+"/../lib")

import opts

def all_not_none(list_):

    return reduce(lambda a, b: a and b, map(lambda e: e != None, list_))

def main():

    # Get config from env vars

    config_names = ['in_root', 'out_root']

    env_names = []

    configs = map(lambda col: opts.get_env_vars(config_names, col, env_names),

        ['left', 'right'])

    if not all_not_none(configs): raise SystemExit(

        'Usage: '+opts.env_usage(env_names)+' '+sys.argv[0]+' <in_map >out_map')

    # Transform map

    reader = csv.reader(sys.stdin)

    writer = csv.writer(sys.stdout)

    cols = reader.next()

    for i in xrange(len(configs)):

        config = configs[i]

        config['root'] = cols[i]

        label = cols[i].partition('/')[0]

        config['prefix'] = label+config['in_root']

        config['prefix_len'] = len(config['prefix'])

        cols[i] = label+config['out_root']

    writer.writerow(cols)

    for row in reader:

        for i in xrange(len(configs)): row[i] = configs[i]['root']+row[i]

        if row[0].startswith(configs[0]['prefix']):

            if not row[1].startswith(configs[1]['prefix']):

                raise SystemExit('Map error: Root "'+configs[1]['prefix']

                    +'" is not contained in output mapping: '+row[1])

            for i in xrange(len(configs)):

                row[i] = row[i][configs[i]['prefix_len']:]

            writer.writerow(row)

main()