import logging
import sys
import re

from inspect import getdoc

from .. import __version__
from .command import Command
from .formatter import Formatter
from .log_printer import LogPrinter

from docker.client import APIError
from .errors import UserError
from .docopt_command import NoSuchCommand

log = logging.getLogger(__name__)


def main():
    console_handler = logging.StreamHandler()
    console_handler.setFormatter(logging.Formatter())
    console_handler.setLevel(logging.INFO)
    root_logger = logging.getLogger()
    root_logger.addHandler(console_handler)
    root_logger.setLevel(logging.DEBUG)

    # Disable requests logging
    logging.getLogger("requests").propagate = False

    try:
        command = TopLevelCommand()
        command.sys_dispatch()
    except KeyboardInterrupt:
        log.error("\nAborting.")
        exit(1)
    except UserError, e:
        log.error(e.msg)
        exit(1)
    except NoSuchCommand, e:
        log.error("No such command: %s", e.command)
        log.error("")
        log.error("\n".join(parse_doc_section("commands:", getdoc(e.supercommand))))
        exit(1)
    except APIError, e:
        log.error(e.explanation)
        exit(1)


# stolen from docopt master
def parse_doc_section(name, source):
    pattern = re.compile('^([^\n]*' + name + '[^\n]*\n?(?:[ \t].*?(?:\n|$))*)',
                         re.IGNORECASE | re.MULTILINE)
    return [s.strip() for s in pattern.findall(source)]


class TopLevelCommand(Command):
    """.

    Usage:
      plum [options] [COMMAND] [ARGS...]
      plum -h|--help

    Options:
      --verbose            Show more output
      --version            Print version and exit

    Commands:
      ps        List services and containers
      run       Run a one-off command
      start     Start services
      stop      Stop services

    """
    def docopt_options(self):
        options = super(TopLevelCommand, self).docopt_options()
        options['version'] = "plum %s" % __version__
        return options

    def ps(self, options):
        """
        List services and containers.

        Usage: ps [options]

        Options:
            -q    Only display IDs
        """
        if options['-q']:
            for container in self.project.containers(all=True):
                print container.id
        else:
            headers = [
                'Name',
                'Command',
                'State',
                'Ports',
            ]
            rows = []
            for container in self.project.containers(all=True):
                rows.append([
                    container.name,
                    container.human_readable_command,
                    container.human_readable_state,
                    container.human_readable_ports,
                ])
            print Formatter().table(headers, rows)

    def run(self, options):
        """
        Run a one-off command.

        Usage: run SERVICE COMMAND [ARGS...]
        """
        service = self.project.get_service(options['SERVICE'])
        if service is None:
            raise UserError("No such service: %s" % options['SERVICE'])
        container_options = {
            'command': [options['COMMAND']] + options['ARGS'],
        }
        container = service.create_container(**container_options)
        stream = container.logs(stream=True)
        service.start_container(container, ports=None)
        for data in stream:
            if data is None:
                break
            print data

    def start(self, options):
        """
        Start all services

        Usage: start [-d]
        """
        if options['-d']:
            self.project.start()
            return

        running = []
        unstarted = []

        for s in self.project.services:
            if len(s.containers()) == 0:
                unstarted.append((s, s.create_container()))
            else:
                running += s.containers(all=False)

        log_printer = LogPrinter(running + [c for (s, c) in unstarted])

        for (s, c) in unstarted:
            s.start_container(c)

        try:
            log_printer.run()
        finally:
            self.project.stop()

    def stop(self, options):
        """
        Stop all services

        Usage: stop
        """
        self.project.stop()

    def logs(self, options):
        """
        View containers' output

        Usage: logs
        """
        containers = self.project.containers(all=False)
        print "Attaching to", list_containers(containers)
        LogPrinter(containers, attach_params={'logs': True}).run()


def list_containers(containers):
    return ", ".join(c.name for c in containers)