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#!/usr/bin/env python
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# Subtracts map spreadsheet A1->C from A0->B to produce A->B.
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# Other A0 entries are subtracted as well:
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# - Empty entries without a comment documenting why they are empty, if there is
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#   a matching entry in A1.
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# - Entries whose input and output maps to the same non-empty value in A1
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# Multi-safe (supports an input appearing multiple times). Note that if there is
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# *any* mapping for an input in subtract_map, all mappings for that input in
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# from_map will be excluded.
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import csv
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import operator
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import os.path
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import sys
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sys.path.append(os.path.dirname(__file__)+"/../lib")
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import maps
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import opts
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import util
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def main():
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    ignore = opts.env_flag('ignore')
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    try: _prog_name, map_1_path = sys.argv[:2]
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    except ValueError:
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        raise SystemExit('Usage: env [ignore=1] '+sys.argv[0]+' <from_map '
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            'subtract_map [compare_col_num...] [| '+sys.argv[0]
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            +' subtract_map_2]... >difference_map')
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    compare_col_nums = map(int, sys.argv[2:]) # 0-based
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    if compare_col_nums == []:
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        compare_col_nums = None # list_subset() value for all columns
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    def compare_on(row):
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        return tuple(util.list_subset(row, compare_col_nums, default=None))
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    headers = [None]*2
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    # Get map 1
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    input_cols = set()
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    compare_cols = set()
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    map_ = dict()
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    stream = open(map_1_path, 'rb')
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    reader = csv.reader(stream)
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    headers[1] = reader.next()
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    for row in reader:
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        if row[0] != '':
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            input_cols.add(row[0])
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            compare_cols.add(compare_on(row))
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            if reduce(operator.and_, (v == '' for v in row[1:])): # all empty
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                map_[row[0]] = row[1]
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    stream.close()
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    # Open map 0
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    reader = csv.reader(sys.stdin)
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    headers[0] = reader.next()
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    # Check col labels
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    combinable = maps.combinable(*headers)
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    if not combinable and not ignore:
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        raise SystemExit('Map error: '
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        'Map 0 column 0 label doesn\'t contain map 1 column 0 label')
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    # Subtract map 1 from map 0
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    writer = csv.writer(sys.stdout)
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    writer.writerow(headers[0])
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    for row in reader:
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        if not combinable or not (
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            (maps.is_nonexplicit_empty_mapping(row) and row[0] in input_cols)
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            or compare_on(row) in compare_cols
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            or util.have_same_value(map_, row[0], row[1]) # map to same place
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            ):
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            # not combinable or not in map 1
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            writer.writerow(row)
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main()
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