#!/usr/bin/env python3
# Copyright (c) 2008-11 Qtrac Ltd. All rights reserved.
# This program or module is free software: you can redistribute it and/or
# modify it under the terms of the GNU General Public License as published
# by the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version. It is provided for educational
# purposes and is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.

import sys
import xml.sax.saxutils


def main():
    maxwidth, format = process_options()
    if maxwidth is not None:
        print_start()
        count = 0
        while True:
            try:
                line = input()
                if count == 0:
                    color = "lightgreen"
                elif count % 2:
                    color = "white"
                else:
                    color = "lightyellow"
                print_line(line, color, maxwidth, format)
                count += 1
            except EOFError:
                break
        print_end()


def process_options():
    maxwidth_arg = "maxwidth="
    format_arg = "format="
    maxwidth = 100
    format = ".0f"
    for arg in sys.argv[1:]:
        if arg in ["-h", "--help"]:
            print("""\
usage:
csv2html.py [maxwidth=int] [format=str] < infile.csv > outfile.html

maxwidth is an optional integer; if specified, it sets the maximum
number of characters that can be output for string fields,
otherwise a default of {0} characters is used.

format is the format to use for numbers; if not specified it
defaults to "{1}".""".format(maxwidth, format))
            return None, None
        elif arg.startswith(maxwidth_arg):
            try:
                maxwidth = int(arg[len(maxwidth_arg):])
            except ValueError:
                pass
        elif arg.startswith(format_arg):
            format = arg[len(format_arg):]
    return maxwidth, format


def print_start():
    print("<table border='1'>")


def print_line(line, color, maxwidth, format):
    print("<tr bgcolor='{0}'>".format(color))
    numberFormat = "<td align='right'>{{0:{0}}}</td>".format(format)
    fields = extract_fields(line)
    for field in fields:
        if not field:
            print("<td></td>")
        else:
            number = field.replace(",", "")
            try:
                x = float(number)
                print(numberFormat.format(x))
            except ValueError:
                field = field.title()
                field = field.replace(" And ", " and ")
                if len(field) <= maxwidth:
                    field = xml.sax.saxutils.escape(field)
                else:
                    field = "{0} ...".format(
                            xml.sax.saxutils.escape(field[:maxwidth]))
                print("<td>{0}</td>".format(field))
    print("</tr>")


def extract_fields(line):
    fields = []
    field = ""
    quote = None
    for c in line:
        if c in "\"'":
            if quote is None:
                quote = c
            elif quote == c:
                quote = None
            else:
                field += c
            continue
        if quote is None and c == ",":
            fields.append(field)
            field = ""
        else:
            field += c
    if field:
        fields.append(field)
    return fields


def print_end():
    print("</table>")


main()