"""
CLI arguments definition.

"""
from argparse import (FileType, OPTIONAL, SUPPRESS, ZERO_OR_MORE)
from textwrap import dedent, wrap

from .. import __doc__, __version__
from .argparser import HTTPieArgumentParser
from .argtypes import (
    KeyValueArgType, SessionNameValidator,
    readable_file_arg, response_charset_type, response_mime_type,
)
from .constants import (
    DEFAULT_FORMAT_OPTIONS, OUTPUT_OPTIONS,
    OUTPUT_OPTIONS_DEFAULT, OUT_REQ_BODY, OUT_REQ_HEAD,
    OUT_RESP_BODY, OUT_RESP_HEAD, OUT_RESP_META, PRETTY_MAP, PRETTY_STDOUT_TTY_ONLY,
    RequestType, SEPARATOR_GROUP_ALL_ITEMS, SEPARATOR_PROXY,
    SORTED_FORMAT_OPTIONS_STRING,
    UNSORTED_FORMAT_OPTIONS_STRING,
)
from .utils import LazyChoices
from ..output.formatters.colors import (
    AUTO_STYLE, DEFAULT_STYLE, get_available_styles
)
from ..plugins.builtin import BuiltinAuthPlugin
from ..plugins.registry import plugin_manager
from ..sessions import DEFAULT_SESSIONS_DIR
from ..ssl_ import AVAILABLE_SSL_VERSION_ARG_MAPPING, DEFAULT_SSL_CIPHERS


parser = HTTPieArgumentParser(
    prog='http',
    description=f'{__doc__.strip()} <https://httpie.io>',
    epilog=dedent('''
    For every --OPTION there is also a --no-OPTION that reverts OPTION
    to its default value.

    Suggestions and bug reports are greatly appreciated:

        https://github.com/httpie/httpie/issues

    '''),
)
parser.register('action', 'lazy_choices', LazyChoices)

#######################################################################
# Positional arguments.
#######################################################################

positional = parser.add_argument_group(
    title='Positional Arguments',
    description=dedent('''
    These arguments come after any flags and in the order they are listed here.
    Only URL is required.

    ''')
)
positional.add_argument(
    dest='method',
    metavar='METHOD',
    nargs=OPTIONAL,
    default=None,
    help='''
    The HTTP method to be used for the request (GET, POST, PUT, DELETE, ...).

    This argument can be omitted in which case HTTPie will use POST if there
    is some data to be sent, otherwise GET:

        $ http example.org               # => GET
        $ http example.org hello=world   # => POST

    '''
)
positional.add_argument(
    dest='url',
    metavar='URL',
    help='''
    The scheme defaults to 'http://' if the URL does not include one.
    (You can override this with: --default-scheme=https)

    You can also use a shorthand for localhost

        $ http :3000                    # => http://localhost:3000
        $ http :/foo                    # => http://localhost/foo

    '''
)
positional.add_argument(
    dest='request_items',
    metavar='REQUEST_ITEM',
    nargs=ZERO_OR_MORE,
    default=None,
    type=KeyValueArgType(*SEPARATOR_GROUP_ALL_ITEMS),
    help=r'''
    Optional key-value pairs to be included in the request. The separator used
    determines the type:

    ':' HTTP headers:

        Referer:https://httpie.io  Cookie:foo=bar  User-Agent:bacon/1.0

    '==' URL parameters to be appended to the request URI:

        search==httpie

    '=' Data fields to be serialized into a JSON object (with --json, -j)
        or form data (with --form, -f):

        name=HTTPie  language=Python  description='CLI HTTP client'

    ':=' Non-string JSON data fields (only with --json, -j):

        awesome:=true  amount:=42  colors:='["red", "green", "blue"]'

    '@' Form file fields (only with --form or --multipart):

        cv@~/Documents/CV.pdf
        cv@'~/Documents/CV.pdf;type=application/pdf'

    '=@' A data field like '=', but takes a file path and embeds its content:

        essay=@Documents/essay.txt

    ':=@' A raw JSON field like ':=', but takes a file path and embeds its content:

        package:=@./package.json

    You can use a backslash to escape a colliding separator in the field name:

        field-name-with\:colon=value

    '''
)

#######################################################################
# Content type.
#######################################################################

content_type = parser.add_argument_group(
    title='Predefined Content Types',
    description=None
)

content_type.add_argument(
    '--json', '-j',
    action='store_const',
    const=RequestType.JSON,
    dest='request_type',
    help='''
    (default) Data items from the command line are serialized as a JSON object.
    The Content-Type and Accept headers are set to application/json
    (if not specified).

    '''
)
content_type.add_argument(
    '--form', '-f',
    action='store_const',
    const=RequestType.FORM,
    dest='request_type',
    help='''
    Data items from the command line are serialized as form fields.

    The Content-Type is set to application/x-www-form-urlencoded (if not
    specified). The presence of any file fields results in a
    multipart/form-data request.

    '''
)
content_type.add_argument(
    '--multipart',
    action='store_const',
    const=RequestType.MULTIPART,
    dest='request_type',
    help='''
    Similar to --form, but always sends a multipart/form-data
    request (i.e., even without files).

    '''
)
content_type.add_argument(
    '--boundary',
    help='''
    Specify a custom boundary string for multipart/form-data requests.
    Only has effect only together with --form.

    '''
)
content_type.add_argument(
    '--raw',
    help='''
    This option allows you to pass raw request data without extra processing
    (as opposed to the structured request items syntax):

        $ http --raw='data' pie.dev/post

    You can achieve the same by piping the data via stdin:

        $ echo data | http pie.dev/post

    Or have HTTPie load the raw data from a file:

        $ http pie.dev/post @data.txt


    '''
)


#######################################################################
# Content processing.
#######################################################################

content_processing = parser.add_argument_group(
    title='Content Processing Options',
    description=None
)

content_processing.add_argument(
    '--compress', '-x',
    action='count',
    default=0,
    help='''
    Content compressed (encoded) with Deflate algorithm.
    The Content-Encoding header is set to deflate.

    Compression is skipped if it appears that compression ratio is
    negative. Compression can be forced by repeating the argument.

    '''
)

#######################################################################
# Output processing
#######################################################################

output_processing = parser.add_argument_group(title='Output Processing')

output_processing.add_argument(
    '--pretty',
    dest='prettify',
    default=PRETTY_STDOUT_TTY_ONLY,
    choices=sorted(PRETTY_MAP.keys()),
    help='''
    Controls output processing. The value can be "none" to not prettify
    the output (default for redirected output), "all" to apply both colors
    and formatting (default for terminal output), "colors", or "format".

    '''
)


def format_style_help(available_styles):
    return '''
    Output coloring style (default is "{default}"). It can be one of:

        {available_styles}

    The "{auto_style}" style follows your terminal's ANSI color styles.
    For non-{auto_style} styles to work properly, please make sure that the
    $TERM environment variable is set to "xterm-256color" or similar
    (e.g., via `export TERM=xterm-256color' in your ~/.bashrc).
    '''.format(
        default=DEFAULT_STYLE,
        available_styles='\n'.join(
            f'        {line.strip()}'
            for line in wrap(', '.join(available_styles), 60)
        ).strip(),
        auto_style=AUTO_STYLE,
    )


output_processing.add_argument(
    '--style', '-s',
    dest='style',
    metavar='STYLE',
    default=DEFAULT_STYLE,
    action='lazy_choices',
    getter=get_available_styles,
    help_formatter=format_style_help
)

_sorted_kwargs = {
    'action': 'append_const',
    'const': SORTED_FORMAT_OPTIONS_STRING,
    'dest': 'format_options'
}
_unsorted_kwargs = {
    'action': 'append_const',
    'const': UNSORTED_FORMAT_OPTIONS_STRING,
    'dest': 'format_options'
}
# The closest approx. of the documented resetting to default via --no-<option>.
# We hide them from the doc because they act only as low-level aliases here.
output_processing.add_argument('--no-unsorted', **_sorted_kwargs, help=SUPPRESS)
output_processing.add_argument('--no-sorted', **_unsorted_kwargs, help=SUPPRESS)

output_processing.add_argument(
    '--unsorted',
    **_unsorted_kwargs,
    help=f'''
    Disables all sorting while formatting output. It is a shortcut for:

        --format-options={UNSORTED_FORMAT_OPTIONS_STRING}

    '''
)
output_processing.add_argument(
    '--sorted',
    **_sorted_kwargs,
    help=f'''
    Re-enables all sorting options while formatting output. It is a shortcut for:

        --format-options={SORTED_FORMAT_OPTIONS_STRING}

    '''
)

output_processing.add_argument(
    '--response-charset',
    metavar='ENCODING',
    type=response_charset_type,
    help='''
    Override the response encoding for terminal display purposes, e.g.:

        --response-charset=utf8
        --response-charset=big5

    '''
)

output_processing.add_argument(
    '--response-mime',
    metavar='MIME_TYPE',
    type=response_mime_type,
    help='''
    Override the response mime type for coloring and formatting for the terminal, e.g.:

        --response-mime=application/json
        --response-mime=text/xml

    '''
)

output_processing.add_argument(
    '--format-options',
    action='append',
    help='''
    Controls output formatting. Only relevant when formatting is enabled
    through (explicit or implied) --pretty=all or --pretty=format.
    The following are the default options:

        {option_list}

    You may use this option multiple times, as well as specify multiple
    comma-separated options at the same time. For example, this modifies the
    settings to disable the sorting of JSON keys, and sets the indent size to 2:

        --format-options json.sort_keys:false,json.indent:2

    This is something you will typically put into your config file.

    '''.format(
        option_list='\n'.join(
            f'        {option}' for option in DEFAULT_FORMAT_OPTIONS).strip()
    )
)

#######################################################################
# Output options
#######################################################################
output_options = parser.add_argument_group(title='Output Options')

output_options.add_argument(
    '--print', '-p',
    dest='output_options',
    metavar='WHAT',
    help=f'''
    String specifying what the output should contain:

        '{OUT_REQ_HEAD}' request headers
        '{OUT_REQ_BODY}' request body
        '{OUT_RESP_HEAD}' response headers
        '{OUT_RESP_BODY}' response body

    The default behaviour is '{OUTPUT_OPTIONS_DEFAULT}' (i.e., the response
    headers and body is printed), if standard output is not redirected.
    If the output is piped to another program or to a file, then only the
    response body is printed by default.

    '''
)
output_options.add_argument(
    '--headers', '-h',
    dest='output_options',
    action='store_const',
    const=OUT_RESP_HEAD,
    help=f'''
    Print only the response headers. Shortcut for --print={OUT_RESP_HEAD}.

    '''
)
output_options.add_argument(
    '--meta', '-m',
    dest='output_options',
    action='store_const',
    const=OUT_RESP_META,
    help=f'''
    Print only the response metadata. Shortcut for --print={OUT_RESP_META}.

    '''
)
output_options.add_argument(
    '--body', '-b',
    dest='output_options',
    action='store_const',
    const=OUT_RESP_BODY,
    help=f'''
    Print only the response body. Shortcut for --print={OUT_RESP_BODY}.

    '''
)

output_options.add_argument(
    '--verbose', '-v',
    dest='verbose',
    action='count',
    default=0,
    help=f'''
    Verbose output. Print the whole request as well as the response. Also print
    any intermediary requests/responses (such as redirects).
    It's a shortcut for: --all --print={''.join(OUTPUT_OPTIONS)}

    '''
)
output_options.add_argument(
    '--all',
    default=False,
    action='store_true',
    help='''
    By default, only the final request/response is shown. Use this flag to show
    any intermediary requests/responses as well. Intermediary requests include
    followed redirects (with --follow), the first unauthorized request when
    Digest auth is used (--auth=digest), etc.

    '''
)
output_options.add_argument(
    '--history-print', '-P',
    dest='output_options_history',
    metavar='WHAT',
    help='''
    The same as --print, -p but applies only to intermediary requests/responses
    (such as redirects) when their inclusion is enabled with --all. If this
    options is not specified, then they are formatted the same way as the final
    response.

    '''
)
output_options.add_argument(
    '--stream', '-S',
    action='store_true',
    default=False,
    help='''
    Always stream the response body by line, i.e., behave like `tail -f'.

    Without --stream and with --pretty (either set or implied),
    HTTPie fetches the whole response before it outputs the processed data.

    Set this option when you want to continuously display a prettified
    long-lived response, such as one from the Twitter streaming API.

    It is useful also without --pretty: It ensures that the output is flushed
    more often and in smaller chunks.

    '''
)
output_options.add_argument(
    '--output', '-o',
    type=FileType('a+b'),
    dest='output_file',
    metavar='FILE',
    help='''
    Save output to FILE instead of stdout. If --download is also set, then only
    the response body is saved to FILE. Other parts of the HTTP exchange are
    printed to stderr.

    '''

)

output_options.add_argument(
    '--download', '-d',
    action='store_true',
    default=False,
    help='''
    Do not print the response body to stdout. Rather, download it and store it
    in a file. The filename is guessed unless specified with --output
    [filename]. This action is similar to the default behaviour of wget.

    '''
)

output_options.add_argument(
    '--continue', '-c',
    dest='download_resume',
    action='store_true',
    default=False,
    help='''
    Resume an interrupted download. Note that the --output option needs to be
    specified as well.

    '''
)

output_options.add_argument(
    '--quiet', '-q',
    action='count',
    default=0,
    help='''
    Do not print to stdout or stderr, except for errors and warnings when provided once.
    Provide twice to suppress warnings as well.
    stdout is still redirected if --output is specified.
    Flag doesn't affect behaviour of download beyond not printing to terminal.

    '''
)

#######################################################################
# Sessions
#######################################################################

sessions = parser.add_argument_group(title='Sessions') \
    .add_mutually_exclusive_group(required=False)

session_name_validator = SessionNameValidator(
    'Session name contains invalid characters.'
)

sessions.add_argument(
    '--session',
    metavar='SESSION_NAME_OR_PATH',
    type=session_name_validator,
    help=f'''
    Create, or reuse and update a session. Within a session, custom headers,
    auth credential, as well as any cookies sent by the server persist between
    requests.

    Session files are stored in:

        {DEFAULT_SESSIONS_DIR}/<HOST>/<SESSION_NAME>.json.

    '''
)
sessions.add_argument(
    '--session-read-only',
    metavar='SESSION_NAME_OR_PATH',
    type=session_name_validator,
    help='''
    Create or read a session without updating it form the request/response
    exchange.

    '''
)

#######################################################################
# Authentication
#######################################################################

# ``requests.request`` keyword arguments.
auth = parser.add_argument_group(title='Authentication')
auth.add_argument(
    '--auth', '-a',
    default=None,
    metavar='USER[:PASS] | TOKEN',
    help='''
    For username/password based authentication mechanisms (e.g
    basic auth or digest auth) if only the username is provided
    (-a username), HTTPie will prompt for the password.

    ''',
)


def format_auth_help(auth_plugins_mapping):
    auth_plugins = list(auth_plugins_mapping.values())
    return '''
    The authentication mechanism to be used. Defaults to "{default}".

    {types}

    '''.format(default=auth_plugins[0].auth_type, types='\n    '.join(
        '"{type}": {name}{package}{description}'.format(
            type=plugin.auth_type,
            name=plugin.name,
            package=(
                '' if issubclass(plugin, BuiltinAuthPlugin)
                else f' (provided by {plugin.package_name})'
            ),
            description=(
                '' if not plugin.description else
                '\n      ' + ('\n      '.join(wrap(plugin.description)))
            )
        )
        for plugin in auth_plugins
    ))


auth.add_argument(
    '--auth-type', '-A',
    action='lazy_choices',
    default=None,
    getter=plugin_manager.get_auth_plugin_mapping,
    sort=True,
    cache=False,
    help_formatter=format_auth_help,
)
auth.add_argument(
    '--ignore-netrc',
    default=False,
    action='store_true',
    help='''
    Ignore credentials from .netrc.

    ''',
)

#######################################################################
# Network
#######################################################################

network = parser.add_argument_group(title='Network')

network.add_argument(
    '--offline',
    default=False,
    action='store_true',
    help='''
    Build the request and print it but don’t actually send it.
    '''
)
network.add_argument(
    '--proxy',
    default=[],
    action='append',
    metavar='PROTOCOL:PROXY_URL',
    type=KeyValueArgType(SEPARATOR_PROXY),
    help='''
    String mapping protocol to the URL of the proxy
    (e.g. http:http://foo.bar:3128). You can specify multiple proxies with
    different protocols. The environment variables $ALL_PROXY, $HTTP_PROXY,
    and $HTTPS_proxy are supported as well.

    '''
)
network.add_argument(
    '--follow', '-F',
    default=False,
    action='store_true',
    help='''
    Follow 30x Location redirects.

    '''
)

network.add_argument(
    '--max-redirects',
    type=int,
    default=30,
    help='''
    By default, requests have a limit of 30 redirects (works with --follow).

    '''
)

network.add_argument(
    '--max-headers',
    type=int,
    default=0,
    help='''
    The maximum number of response headers to be read before giving up
    (default 0, i.e., no limit).

    '''
)

network.add_argument(
    '--timeout',
    type=float,
    default=0,
    metavar='SECONDS',
    help='''
    The connection timeout of the request in seconds.
    The default value is 0, i.e., there is no timeout limit.
    This is not a time limit on the entire response download;
    rather, an error is reported if the server has not issued a response for
    timeout seconds (more precisely, if no bytes have been received on
    the underlying socket for timeout seconds).

    '''
)
network.add_argument(
    '--check-status',
    default=False,
    action='store_true',
    help='''
    By default, HTTPie exits with 0 when no network or other fatal errors
    occur. This flag instructs HTTPie to also check the HTTP status code and
    exit with an error if the status indicates one.

    When the server replies with a 4xx (Client Error) or 5xx (Server Error)
    status code, HTTPie exits with 4 or 5 respectively. If the response is a
    3xx (Redirect) and --follow hasn't been set, then the exit status is 3.
    Also an error message is written to stderr if stdout is redirected.

    '''
)
network.add_argument(
    '--path-as-is',
    default=False,
    action='store_true',
    help='''
    Bypass dot segment (/../ or /./) URL squashing.

    '''
)

network.add_argument(
    '--chunked',
    default=False,
    action='store_true',
    help='''
    Enable streaming via chunked transfer encoding.
    The Transfer-Encoding header is set to chunked.

    '''
)

#######################################################################
# SSL
#######################################################################

ssl = parser.add_argument_group(title='SSL')
ssl.add_argument(
    '--verify',
    default='yes',
    help='''
    Set to "no" (or "false") to skip checking the host's SSL certificate.
    Defaults to "yes" ("true"). You can also pass the path to a CA_BUNDLE file
    for private certs. (Or you can set the REQUESTS_CA_BUNDLE environment
    variable instead.)
    '''
)
ssl.add_argument(
    '--ssl',
    dest='ssl_version',
    choices=sorted(AVAILABLE_SSL_VERSION_ARG_MAPPING.keys()),
    help='''
    The desired protocol version to use. This will default to
    SSL v2.3 which will negotiate the highest protocol that both
    the server and your installation of OpenSSL support. Available protocols
    may vary depending on OpenSSL installation (only the supported ones
    are shown here).

    '''
)
ssl.add_argument(
    '--ciphers',
    help=f'''

    A string in the OpenSSL cipher list format. By default, the following
    is used:

    {DEFAULT_SSL_CIPHERS}

    '''
)
ssl.add_argument(
    '--cert',
    default=None,
    type=readable_file_arg,
    help='''
    You can specify a local cert to use as client side SSL certificate.
    This file may either contain both private key and certificate or you may
    specify --cert-key separately.

    '''
)

ssl.add_argument(
    '--cert-key',
    default=None,
    type=readable_file_arg,
    help='''
    The private key to use with SSL. Only needed if --cert is given and the
    certificate file does not contain the private key.

    '''
)

#######################################################################
# Troubleshooting
#######################################################################

troubleshooting = parser.add_argument_group(title='Troubleshooting')

troubleshooting.add_argument(
    '--ignore-stdin', '-I',
    action='store_true',
    default=False,
    help='''
    Do not attempt to read stdin.

    '''
)
troubleshooting.add_argument(
    '--help',
    action='help',
    default=SUPPRESS,
    help='''
    Show this help message and exit.

    '''
)
troubleshooting.add_argument(
    '--version',
    action='version',
    version=__version__,
    help='''
    Show version and exit.

    '''
)
troubleshooting.add_argument(
    '--traceback',
    action='store_true',
    default=False,
    help='''
    Prints the exception traceback should one occur.

    '''
)
troubleshooting.add_argument(
    '--default-scheme',
    default="http",
    help='''
    The default scheme to use if not specified in the URL.

    '''
)
troubleshooting.add_argument(
    '--debug',
    action='store_true',
    default=False,
    help='''
    Prints the exception traceback should one occur, as well as other
    information useful for debugging HTTPie itself and for reporting bugs.

    '''
)