#! /usr/bin/env python3
##
##  coinfetch - Cryptocurrency price fetcher
##  Copyright (C) 2015-2017 Delwink, LLC
##
## Redistributions, modified or unmodified, in whole or in part, must retain
## applicable copyright or other legal privilege notices, these conditions, and
## the following license terms and disclaimer.  Subject to these conditions,
## the holder(s) of copyright or other legal privileges, author(s) or
## assembler(s), and contributors of this work hereby grant to any person who
## obtains a copy of this work in any form:
##
## 1. Permission to reproduce, modify, distribute, publish, sell, sublicense,
## use, and/or otherwise deal in the licensed material without restriction.
##
## 2. A perpetual, worldwide, non-exclusive, royalty-free, irrevocable patent
## license to reproduce, modify, distribute, publish, sell, use, and/or
## otherwise deal in the licensed material without restriction, for any and all
## patents:
##
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##     author or assembler, or contributor, necessarily infringed by the
##     contributions alone or by combination with the work, of that privilege
##     holder, author or assembler, or contributor.
##
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##     any contribution to the work.
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## LICENSE OR THE ACT OF DISTRIBUTION UNDER THE TERMS OF THIS LICENSE,
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from argparse import Action, ArgumentParser
from configparser import ConfigParser
from cfetch import __version__, get_ticker, get_registered_tickers
from cfetch import load_default_plugins, NoSuchKindException
from cfetch import NoSuchPairException
from os.path import expanduser, join, exists
from os import makedirs

__title__ = 'coinfetch'
__author__ = 'David McMackins II'
__version_info__ = '''{} {}
Copyright (C) 2015-2017 Delwink, LLC
License COIL: Copyfree Open Innovation License 0.5
<http://coil.apotheon.org/plaintext/00.5.txt>

This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Written by {}'''.format(__title__, __version__, __author__)

CONFIG_DIR = join(expanduser('~'), '.coinfetch')
CONFIG_PATH = join(CONFIG_DIR, 'config.ini')
config = ConfigParser()

if not exists(CONFIG_PATH):
    if not exists(CONFIG_DIR):
        makedirs(CONFIG_DIR)

    config['coinfetch'] = {}
    config['coinfetch']['api'] = 'cb'
    with open(CONFIG_PATH, 'w') as f:
        config.write(f)
else:
    config.read(CONFIG_PATH)

default_api = config['coinfetch']['api']

load_default_plugins()
tickers = get_registered_tickers()
tickers.sort()

apis = [api for api, desc in tickers]

class DefaultApiAction(Action):
    def __call__(self, parser, values, namespace, option_string):
        config['coinfetch']['api'] = namespace
        with open(CONFIG_PATH, 'w') as f:
            config.write(f)
        print('Default API set to', namespace)
        exit(0)

class ListAction(Action):
    def __call__(self, parser, values, namespace, option_string):
        for api, desc in tickers:
            if api == default_api:
                desc += ' (default)'
            print(api + '\t- ' + desc)
        exit(0)

class VersionAction(Action):
    def __call__(self, parser, values, namespace, option_string):
        print(__version_info__)
        exit(0)

cli = ArgumentParser(__title__)

cli.add_argument('-a', '--api', default=default_api, choices=apis,
                 help='uses an API by name')
cli.add_argument('-k', '--kind', help='specifies which kind of rate to get')
cli.add_argument('-l', '--list-apis', action=ListAction,
                 help='list available APIs and exit', nargs=0)
cli.add_argument('--set-default', action=DefaultApiAction, choices=apis,
                 help='sets the default API and exits')
cli.add_argument('-v', '--version', action=VersionAction,
                 help='show version information and exit', nargs=0)

cli.add_argument('amount', default=1, help='amount of the original currency',
                 nargs='?', type=float)
cli.add_argument('src', help='currency from which to convert')
cli.add_argument('dest', help='currency to which to convert')

args = cli.parse_args()

try:
    ticker = get_ticker(args.api)

    rate_args = [args.src, args.dest, args.amount]
    if args.kind:
        rate_args.append(args.kind)

    rate = ticker.get_rate(*rate_args)
    print(format(rate, '.8f'))
except NoSuchKindException:
    print('The', args.kind, 'rate is not available with the', args.api, 'API.')
    exit(10)
except NoSuchPairException:
    pair = '/'.join([args.src, args.dest])
    print('The pair', pair, 'was not found using the', args.api, 'API.')
    exit(11)