#!/usr/bin/env python

"""
The MIT License (MIT)

Copyright (c) 2013 Jeremy Gillick

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
"""

import sys
import os
import signal
from datetime import datetime
import argparse

try:
    from daemon import runner
    hasDaemonRunner = True
except ImportError:
    hasDaemonRunner = False

# Add local paths to support running without installing
if sys.argv[0][0:2] == './':
    sys.path.insert(0, '.')
    sys.path.insert(0, '../')

import lcinvestor
from lcinvestor.settings import Settings

investor = None
pid_lockfile = 'lcinvestor.pid'


def interupt_handler(signum, frame):
        """
        Exit gracefully
        """
        if investor:
            investor.stop()
        else:
            print '\n\nStopping program...\n'
        exit(0)
signal.signal(signal.SIGINT, interupt_handler)


def is_daemon_running():
    """
    Check if the pid locked file status.
    True if the daemon is believed to be running (based on the lockfile)
    False if it is not.
    """
    path = get_lockfile_path()
    lockfile = runner.make_pidlockfile(path, 1)
    if lockfile.is_locked():
        return True
    return False


def get_lockfile_path():
    """
    Get the path to the PID lockfile.
    This file will live in the default user app directory set by the AutoInvestor class
    """
    app_dir = lcinvestor.util.get_app_directory()
    path = os.path.join(app_dir, pid_lockfile)
    return path

if __name__ == '__main__':
    description = 'A program that watches your LendingClub account and automatically invests cash as it becomes available based on your personalized investment preferences.'

    # Process command flags
    if hasDaemonRunner:
        parser = argparse.ArgumentParser(usage='%(prog)s [options] [start/stop/status]', description=description)
    else:
        parser = argparse.ArgumentParser(usage='%(prog)s [options]', description=description)

    parser.add_argument('--email', action='store', dest='email', default=None, help='The email used to login to LendingClub')
    parser.add_argument('--pass', action='store', dest='password', metavar='pass', default=None, help='Your LendingClub password.')
    parser.add_argument('-c', '--config', action='store', dest='config_file', default=None, help='A JSON file with the investment settings you want to use.')
    parser.add_argument('-q', '--quiet', action='store_true', dest='quiet', default=False, help='Don\'t show a confirmation prompt with your investment settings. Must be used with --config.')
    parser.add_argument('--version', action='store_true', default=False, help='Print the lcinvestor version number')
    parser.add_argument('-v', '--verbose', action='store_true', dest='verbose', default=False, help='Verbose output')

    if hasDaemonRunner:
        parser.add_argument('start/stop/status', action='store', type=str, nargs='*', help='Start or stop the this as a background task (daemon). Use status to see the current daemon status')

    # Change section titles
    parser._positionals.title = 'Daemon Commands'
    parser._optionals.title = 'Options'

    options = parser.parse_args()

    options.action = options.__dict__['start/stop/status'] if hasDaemonRunner else []
    action = options.action[0] if (len(options.action) > 0) else None
    isVerbose = options.verbose
    isDaemon = (action is not None)
    isStarting = ('start' == action)
    isStopping = ('stop' == action)

    # Validate options
    if len(options.action) > 1:
        print 'Too many arguments!'
        exit(1)
    if action is not None and action not in ['start', 'stop', 'status']:
        print '\'{0}\' is not a supported action!'.format(action)
        exit(1)
    if options.quiet and options.config_file is None:
        print 'Can not use --quiet without --config'
        exit(1)

    # Start program
    try:
        investor = lcinvestor.AutoInvestor(verbose=isVerbose)

        # Print version number
        if options.version:
            print 'lcinvestor {0}'.format(investor.version())
            exit(0)

        # Print daemon status and exit
        if action == 'status':
            if is_daemon_running():
                print 'The lcinvestor daemon is running'

                # Print info on the last investment
                last_investment = investor.get_last_investment()
                if last_investment:
                    timestamp = datetime.fromtimestamp(last_investment['timestamp'])

                    print '\nLast investment:'
                    print '${0} was invested at {1}'.format(last_investment['cash'], timestamp.strftime("%A %B %d, %Y at %I:%M%p"))
                    print investor.get_order_summary(last_investment['investment'])
            else:
                print 'The lcinvestor daemon is not running'
            exit(0)

        # Create settings from config file
        if options.config_file is not None:
            if not os.path.exists(options.config_file):
                print 'The file \'{0}\' doesn\'t exists'.format(options.config_file)
                exit(1)
            try:
                investor.settings.load_investment_settings_file(options.config_file)
                if not investor.settings.is_dirty:
                    print 'Your config file did not set anything.'
                    exit(1)

            except Exception as e:
                print str(e)
                exit(1)

        # Email and password
        if options.email is not None:
            investor.settings['email'] = options.email
        if options.password is not None:
            investor.settings['pass'] = options.password

        if isStarting or not isDaemon:
            investor.welcome_screen()

            # Remove all arguments but the script and the deamon action
            # Otherwise, daemon runner will throw an error if the action is not the first argument
            sys.argv = [sys.argv[0], action]

            # Authenticate from email/password on the command line
            if investor.settings['email'] is not None and investor.settings['pass'] is not None:
                try:
                    investor.authenticate()
                    print 'Authenticated successfully!\n'
                except Exception as e:
                    print 'Authentication failed!'
                    print str(e.value)
                    exit(1)

            # Show summary, without setup prompts
            if options.quiet and options.config_file is not None and investor.settings.is_dirty:
                investor.settings.show_summary()

            # Prompt for investment settings
            else:
                investor.setup()

        # Start daemon
        if hasDaemonRunner and isDaemon:

            # Set daemon attributes
            logfile_path = os.path.join(investor.app_dir, 'daemon.log')
            investor.stdin_path = '/dev/null'
            investor.stdout_path = logfile_path
            investor.stderr_path = logfile_path
            investor.pidfile_path = get_lockfile_path()
            investor.pidfile_timeout = 1

            # Check if the pid locked file status
            if is_daemon_running():
                if isStarting:
                    print 'It looks like an investor daemon is already running!\nIf this is incorrect, delete \'{0}\' and try again.'.format(investor.pidfile_path)
                    exit(1)
            else:
                if isStopping:
                    print 'It doesn\'t look like there is an investor daemon running.'
                    exit(1)

            if isStarting:
                print 'Starting auto investor daemon...'
                print 'pid at {0}'.format(investor.pidfile_path)
                print 'Logging output to {0}'.format(logfile_path)
            else:
                print 'Stopping auto investor daemon...'

            # Start daemon
            try:
                daemon_runner = runner.DaemonRunner(investor)
                daemon_runner.do_action()
            except runner.DaemonRunnerStartFailureError as e:
                print 'Could not start daemon: {0}'.format(str(e))
            except runner.DaemonRunnerStopFailureError as e:
                print 'Could not stop daemon: {0}'.format(str(e))

        # Start in the foreground
        else:
            investor.run()

    except lcinvestor.AutoInvestorError as e:
        print 'ERROR: {0}'.format(str(e))
        exit(1)
