#!/usr/bin/env python
import argparse, sys, logging, logging.handlers
import os
from libpathod import pathod, utils, version, rparse


def daemonize (stdin='/dev/null', stdout='/dev/null', stderr='/dev/null'):
    try:
        pid = os.fork()
        if pid > 0:
            sys.exit(0)
    except OSError, e:
        sys.stderr.write ("fork #1 failed: (%d) %s\n" % (e.errno, e.strerror) )
        sys.exit(1)
    os.chdir("/")
    os.umask(0)
    os.setsid()
    try:
        pid = os.fork()
        if pid > 0:
            sys.exit(0)
    except OSError, e:
        sys.stderr.write ("fork #2 failed: (%d) %s\n" % (e.errno, e.strerror) )
        sys.exit(1)
    si = open(stdin, 'r')
    so = open(stdout, 'a+')
    se = open(stderr, 'a+', 0)
    os.dup2(si.fileno(), sys.stdin.fileno())
    os.dup2(so.fileno(), sys.stdout.fileno())
    os.dup2(se.fileno(), sys.stderr.fileno())


def main(parser, args):
    sl = [args.ssl_keyfile, args.ssl_certfile]
    if any(sl) and not all(sl):
        parser.error("Both --certfile and --keyfile must be specified.")

    if args.ssl:
        ssl = dict(
             keyfile = args.ssl_keyfile or utils.data.path("resources/server.key"),
             certfile = args.ssl_certfile or utils.data.path("resources/server.crt"),
        )
    else:
        ssl = None

    alst = []
    for i in args.anchors:
        parts = utils.parse_anchor_spec(i)
        if not parts:
            parser.error("Invalid anchor specification: %s"%i)
        alst.append(parts)

    root = logging.getLogger()
    if root.handlers:
        for handler in root.handlers:
            root.removeHandler(handler)

    log = logging.getLogger('pathod')
    log.setLevel(logging.DEBUG)
    fmt = logging.Formatter(
        '%(asctime)s: %(message)s',
        datefmt='%d-%m-%y %H:%M:%S',
    )
    if args.logfile:
        fh = logging.handlers.WatchedFileHandler(args.logfile)
        fh.setFormatter(fmt)
        log.addHandler(fh)
    if not args.daemonize:
        sh = logging.StreamHandler()
        sh.setFormatter(fmt)
        log.addHandler(sh)

    sizelimit = None
    if args.sizelimit:
        try:
            sizelimit = utils.parse_size(args.sizelimit)
        except ValueError, v:
            parser.error(v)

    try:
        pd = pathod.Pathod(
            (args.address, args.port),
            craftanchor = args.craftanchor,
            ssloptions = ssl,
            staticdir = args.staticdir,
            anchors = alst,
            sizelimit = sizelimit,
            noweb = args.noweb,
            nocraft = args.nocraft,
            noapi = args.noapi,
            nohang = args.nohang
        )
    except pathod.PathodError, v:
        parser.error(str(v))
    except rparse.FileAccessDenied, v:
        parser.error("%s You probably want to a -d argument."%str(v))

    try:
        print "%s listening on %s:%s"%(version.NAMEVERSION, args.address, pd.port)
        pd.serve_forever()
    except KeyboardInterrupt:
        pass


if __name__ == "__main__":
    parser = argparse.ArgumentParser(description='A pathological HTTP/S daemon.')
    parser.add_argument("-p", dest='port', default=9999, type=int, help='Port. Specify 0 to pick an arbitrary empty port.')
    parser.add_argument("-l", dest='address', default="127.0.0.1", type=str, help='Listening address.')
    parser.add_argument(
        "-a", dest='anchors', default=[], type=str, action="append", metavar="ANCHOR",
        help='Add an anchor. Specified as a string with the form pattern=pagespec'
    )
    parser.add_argument(
        "-c", dest='craftanchor', default="/p/", type=str,
        help='Anchorpoint for URL crafting commands.'
    )
    parser.add_argument(
        "-d", dest='staticdir', default=None, type=str,
        help='Directory for static files.'
    )
    parser.add_argument(
        "-D", dest='daemonize', default=False, action="store_true",
        help='Daemonize.'
    )
    parser.add_argument(
        "-f", dest='logfile', default=None, type=str,
        help='Log file.'
    )
    parser.add_argument(
        "--debug", dest='debug', default=False, action="store_true",
        help='Enable debug output.'
    )
    parser.add_argument(
        "-s", dest='ssl', default=False, action="store_true",
        help='Serve with SSL.'
    )
    parser.add_argument(
        "--limit-size", dest='sizelimit', default=None, type=str,
        help='Size limit of served responses. Understands size suffixes, i.e. 100k.'
    )
    parser.add_argument(
        "--noapi", dest='noapi', default=False, action="store_true",
        help='Disable API.'
    )
    parser.add_argument(
        "--nohang", dest='nohang', default=False, action="store_true",
        help='Disable pauses during crafted response generation.'
    )
    parser.add_argument(
        "--noweb", dest='noweb', default=False, action="store_true",
        help='Disable both web interface and API.'
    )
    parser.add_argument(
        "--nocraft", dest='nocraft', default=False, action="store_true",
        help='Disable response crafting. If anchors are specified, they still work.'
    )
    parser.add_argument(
        "--keyfile", dest='ssl_keyfile', default=None, type=str,
        help='SSL key file. If not specified, a default key is used.'
    )
    parser.add_argument(
        "--certfile", dest='ssl_certfile', default=None, type=str,
        help='SSL cert file. If not specified, a default cert is used.'
    )
    args = parser.parse_args()
    if args.daemonize:
        daemonize()
    main(parser, args)