#!/usr/bin/env python
import os
import sys
import json
import argparse
from collections import namedtuple
import requests
from requests.structures import CaseInsensitiveDict
from .pretty import prettify


__author__ = 'Jakub Roztocil'
__version__ = '0.1'


DEFAULT_UA = 'HTTPie/%s' % __version__
SEP_COMMON = ':'
SEP_DATA = '='
TYPE_FORM = 'application/x-www-form-urlencoded; charset=utf-8'
TYPE_JSON = 'application/json; charset=utf-8'


KeyValue = namedtuple('KeyValue', ['key', 'value', 'sep'])


class KeyValueType(object):

    def __init__(self, separators):
        self.separators = separators

    def __call__(self, string):

        found = {string.find(sep): sep
                 for sep in self.separators
                 if string.find(sep) != -1}
        if not found:
            raise argparse.ArgumentTypeError(
                '"%s" is not a valid value' % string)
        sep = found[min(found.keys())]
        key, value = string.split(sep, 1)
        return KeyValue(key=key, value=value, sep=sep)


parser = argparse.ArgumentParser(
    description='HTTPie - cURL for humans.')


# Content type.
group = parser.add_mutually_exclusive_group(required=False)
group.add_argument('--json', '-j', action='store_true',
                   help='Serialize data items as a JSON object and set'
                        ' Content-Type to application/json, if not specified.')
group.add_argument('--form', '-f', action='store_true',
                   help='Serialize data items as form values and set'
                        ' Content-Type to application/x-www-form-urlencoded,'
                        ' if not specified.')

parser.add_argument('--ugly', '-u', help='Do not prettify the response.',
                     dest='prettify', action='store_false', default=True)

# ``requests.request`` keyword arguments.
parser.add_argument('--auth', help='username:password',
                    type=KeyValueType(SEP_COMMON))
parser.add_argument('--verify',
                    help='Set to "yes" to check the host\'s SSL certificate.'
                         ' You can also pass the  path to a CA_BUNDLE'
                         ' file for private certs. You can also set '
                         'the REQUESTS_CA_BUNDLE  environment variable.')
parser.add_argument('--proxy', default=[], action='append',
                    type=KeyValueType(SEP_COMMON),
                    help='String mapping protocol to the URL of the proxy'
                         ' (e.g. http:foo.bar:3128).')
parser.add_argument('--allow-redirects', default=False, action='store_true',
                    help='Set this flag if full redirects are allowed'
                         ' (e.g. re-POST-ing of data at new ``Location``)')
parser.add_argument('--file', metavar='PATH', type=argparse.FileType(),
                    default=[], action='append',
                    help='File to multipart upload')
parser.add_argument('--timeout', type=float,
                    help='Float describes the timeout of the request'
                         ' (Use socket.setdefaulttimeout() as fallback).')

# Positional arguments.
parser.add_argument('method',
                    help='HTTP method to be used for the request'
                         ' (GET, POST, PUT, DELETE, PATCH, ...).')
parser.add_argument('url', metavar='URL',
                    help='Protocol defaults to http:// if the'
                         ' URL does not include it.')
parser.add_argument('items', metavar='item', nargs='*',
                    type=KeyValueType([SEP_COMMON, SEP_DATA]),
                    help='HTTP header (key:value) or data field (key=value)')


def main():
    args = parser.parse_args()

    # Parse request headers and data from the command line.
    headers = CaseInsensitiveDict()
    headers['User-Agent'] = DEFAULT_UA
    data = {}
    for item in args.items:
        if item.sep == SEP_COMMON:
            target = headers
        else:
            if not sys.stdin.isatty():
                parser.error('Request body (stdin) and request '
                            'data (key=value) cannot be mixed.')
            target = data
        target[item.key] = item.value

    if not sys.stdin.isatty():
        data = sys.stdin.read()

    # JSON/Form content type.
    if args.json or (not args.form and data):
        if sys.stdin.isatty():
            data = json.dumps(data)
        if 'Content-Type' not in headers and (data or args.json):
            headers['Content-Type'] = TYPE_JSON
    elif 'Content-Type' not in headers:
        headers['Content-Type'] = TYPE_FORM

    # Fire the request.
    response = requests.request(
        method=args.method.lower(),
        url=args.url if '://' in args.url else 'http://%s' % args.url,
        headers=headers,
        data=data,
        verify=True if args.verify == 'yes' else args.verify,
        timeout=args.timeout,
        auth=(args.auth.key, args.auth.value) if args.auth else None,
        proxies={proxy.key: proxy.value for proxy in args.proxy},
        files={os.path.basename(f.name): f for f in args.file}
    )

    # Display the response.
    original = response.raw._original_response
    response_bits = (
        u'HTTP/{version} {status} {reason}'.format(
            version='.'.join(str(original.version)),
            status=original.status, reason=original.reason,
        ),
        str(original.msg).decode('utf-8'),
        response.content.decode('utf-8') if response.content else u''
    )

    if args.prettify and sys.stdout.isatty():
        response_bits = prettify(response.headers['content-type'], *response_bits)

    print u'\n'.join(response_bits)


if __name__ == '__main__':
    main()