"""
The command line interface.
"""

import argparse
import logging
import sys
import os

from .account import Account
from .account import deserialize as deserialize_account
from .authorize import authorize
from .issue import issue
from .register import register
from .revoke import revoke
from .errors import ManualeError
import manuale

logger = logging.getLogger(__name__)

# Text
DESCRIPTION = \
"""
Interact with ACME certification authorities such as Let's Encrypt.

No idea what you're doing? Register an account, authorize your domains and
issue a certificate or two. Call a command with -h for more instructions.
"""

DESCRIPTION_REGISTER = \
"""
Creates a new account key and registers on the server. The resulting --account
is saved in the specified file, and required for most other operations.

You only have to do this once. Keep the account file safe and secure: it
contains your private key, and you need it to get certificates!
"""

DESCRIPTION_AUTHORIZE = \
"""
Authorizes a domain or multiple domains for your account through DNS
verification. You will need to set DNS records as prompted.

After authorizing a domain, you can issue certificates for it. Authorizations
can last for a long time, so you might not need to do this every time you want
a new certificate.  This depends on the server being used. You should see an
expiration date for the authorization after completion.

ACME does not currently provide a read-only mechanism for determining if a
domain is already authorized. This means that you might go through this even if
you don't need to.
"""

DESCRIPTION_ISSUE = \
"""
Issues a certificate for one or more domains. Hopefully needless to say, you
must have valid authorizations for the domains you specify first.


This will generate a new RSA key and CSR for you. But if you want, you can
bring your own with the --key-file and --csr-file attributes. You can also set
a custom --key-size. (Don't try something stupid like 512, the server won't
accept it. I tried.)

The resulting key and certificate are written into domain.pem and domain.crt.
A chained certificate with the intermediate included is also written to
domain.chain.crt. You can change the --output directory to something else from
the working directory as well.

(If you're passing your own CSR, the given domains can be whatever you want.)

Note that unlike many other certification authorities, ACME does not add a
non-www or www alias to certificates. If you want this to happen, add it
yourself. You need to authorize both as well.

Certificate issuance has a server-side rate limit. Don't overdo it.
"""

DESCRIPTION_REVOKE = \
"""
Revokes a certificate. The certificate must have been issued using the
current account.
"""

# Defaults
LETS_ENCRYPT_PRODUCTION = "https://acme-v01.api.letsencrypt.org/"
DEFAULT_ACCOUNT_PATH = 'account.json'
DEFAULT_CERT_KEY_SIZE = 2048

# Command handlers
def _register(args):
    register(args.server, args.account, args.email)

def _authorize(args):
    account = load_account(args.account)
    authorize(args.server, account, args.domain)

def _issue(args):
    account = load_account(args.account)
    issue(
        server=args.server,
        account=account,
        domains=args.domain,
        key_size=args.key_size,
        key_file=args.key_file,
        csr_file=args.csr_file,
        output_path=args.output
    )

def _revoke(args):
    account = load_account(args.account)
    revoke(
        server=args.server,
        account=account,
        certificate=args.certificate
    )

def load_account(path):
    # Show a more descriptive message if the file doesn't exist.
    if not os.path.exists(path):
        logger.error("Couldn't find an account file at {}.".format(path))
        logger.error("Are you in the right directory? Did you register yet?")
        logger.error("Run 'manuale -h' for instructions.")
        raise ManualeError()

    try:
        with open(path, 'rb') as f:
            return deserialize_account(f.read())
    except (ValueError, IOError) as e:
        logger.error("Couldn't read account file. Aborting.")
        raise ManualeError(e)

class Formatter(argparse.ArgumentDefaultsHelpFormatter, argparse.RawDescriptionHelpFormatter):
    pass

# Where it all begins.
def main():
    parser = argparse.ArgumentParser(
        description=DESCRIPTION,
        formatter_class=Formatter,
    )
    subparsers = parser.add_subparsers()

    # Server switch
    parser.add_argument('--server', '-s', help="The ACME server to use", default=LETS_ENCRYPT_PRODUCTION)
    parser.add_argument('--account', '-a', help="The account file to use or create", default=DEFAULT_ACCOUNT_PATH)

    # Account creation
    register = subparsers.add_parser(
        'register',
        help="Create a new account and register",
        description=DESCRIPTION_REGISTER,
        formatter_class=Formatter,
    )
    register.add_argument('email', type=str, help="Account e-mail address")
    register.set_defaults(func=_register)

    # Domain verification
    authorize = subparsers.add_parser(
        'authorize',
        help="Verify domain ownership",
        description=DESCRIPTION_AUTHORIZE,
        formatter_class=Formatter,
    )
    authorize.add_argument('domain', help="One or more domain names to authorize", nargs='+')
    authorize.set_defaults(func=_authorize)

    # Certificate issuance
    issue = subparsers.add_parser(
        'issue',
        help="Request a new certificate",
        description=DESCRIPTION_ISSUE,
        formatter_class=Formatter,
    )
    issue.add_argument('domain', help="One or more domain names to include in the certificate", nargs='+')
    issue.add_argument('--key-size', '-b', help="The key size to use for the certificate", type=int, default=DEFAULT_CERT_KEY_SIZE)
    issue.add_argument('--key-file', '-k', help="Existing key file to use for the certificate")
    issue.add_argument('--csr-file', help="Existing signing request to use")
    issue.add_argument('--output', '-o', help="The output directory for created objects", default='.')
    issue.set_defaults(func=_issue)

    # Certificate revocation
    revoke = subparsers.add_parser(
        'revoke',
        help="Revoke an issued certificate",
        description=DESCRIPTION_REVOKE,
        formatter_class=Formatter,
    )
    revoke.add_argument('certificate', help="The certificate file to revoke")
    revoke.set_defaults(func=_revoke)

    # Version
    version = subparsers.add_parser('version', help="Show the version number")
    version.set_defaults(func=lambda *args: logger.info("manuale {}".format(manuale.__version__)))

    # Parse
    args = parser.parse_args()
    if not hasattr(args, 'func'):
        parser.print_help()
        sys.exit(0)

    # Set up logging
    root = logging.getLogger('manuale')
    root.setLevel(logging.INFO)
    handler = logging.StreamHandler(sys.stderr)
    handler.setFormatter(logging.Formatter("%(message)s"))
    root.addHandler(handler)

    # Let's encrypt
    try:
        args.func(args)
    except ManualeError as e:
        if str(e):
            logger.error(e)
        sys.exit(1)
    except KeyboardInterrupt:
        logger.error("")
        logger.error("Interrupted.")
        sys.exit(2)
    except Exception as e:
        logger.error("Oops! An unhandled error occurred. Please file a bug.")
        logger.exception(e)
        sys.exit(3)

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