# -*- coding: utf-8 -*-
"""
OnionShare | https://onionshare.org/

Copyright (C) 2014-2018 Micah Lee <micah@micahflee.com>

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
"""

import os, sys, time, argparse, threading
from datetime import datetime
from datetime import timedelta

from .common import Common
from .web import Web
from .onion import *
from .onionshare import OnionShare

def main(cwd=None):
    """
    The main() function implements all of the logic that the command-line version of
    onionshare uses.
    """
    common = Common()

    # Display OnionShare banner
    print("OnionShare {0:s} | https://onionshare.org/".format(common.version))

    # OnionShare CLI in OSX needs to change current working directory (#132)
    if common.platform == 'Darwin':
        if cwd:
            os.chdir(cwd)

    # Parse arguments
    parser = argparse.ArgumentParser(formatter_class=lambda prog: argparse.HelpFormatter(prog,max_help_position=28))
    parser.add_argument('--local-only', action='store_true', dest='local_only', help="Don't use Tor (only for development)")
    parser.add_argument('--stay-open', action='store_true', dest='stay_open', help="Continue sharing after files have been sent")
    parser.add_argument('--auto-start-timer', metavar='<int>', dest='autostart_timer', default=0, help="Schedule this share to start N seconds from now")
    parser.add_argument('--auto-stop-timer', metavar='<int>', dest='autostop_timer', default=0, help="Stop sharing after a given amount of seconds")
    parser.add_argument('--connect-timeout', metavar='<int>', dest='connect_timeout', default=120, help="Give up connecting to Tor after a given amount of seconds (default: 120)")
    parser.add_argument('--stealth', action='store_true', dest='stealth', help="Use client authorization (advanced)")
    parser.add_argument('--receive', action='store_true', dest='receive', help="Receive shares instead of sending them")
    parser.add_argument('--config', metavar='config', default=False, help="Custom JSON config file location (optional)")
    parser.add_argument('-v', '--verbose', action='store_true', dest='verbose', help="Log OnionShare errors to stdout, and web errors to disk")
    parser.add_argument('filename', metavar='filename', nargs='*', help="List of files or folders to share")
    args = parser.parse_args()

    filenames = args.filename
    for i in range(len(filenames)):
        filenames[i] = os.path.abspath(filenames[i])

    local_only = bool(args.local_only)
    verbose = bool(args.verbose)
    stay_open = bool(args.stay_open)
    autostart_timer = int(args.autostart_timer)
    autostop_timer = int(args.autostop_timer)
    connect_timeout = int(args.connect_timeout)
    stealth = bool(args.stealth)
    receive = bool(args.receive)
    config = args.config

    if receive:
        mode = 'receive'
    else:
        mode = 'share'

    # Make sure filenames given if not using receiver mode
    if mode == 'share' and len(filenames) == 0:
        parser.print_help()
        sys.exit()

    # Validate filenames
    if mode == 'share':
        valid = True
        for filename in filenames:
            if not os.path.isfile(filename) and not os.path.isdir(filename):
                print("{0:s} is not a valid file.".format(filename))
                valid = False
            if not os.access(filename, os.R_OK):
                print("{0:s} is not a readable file.".format(filename))
                valid = False
        if not valid:
            sys.exit()

    # Re-load settings, if a custom config was passed in
    if config:
        common.load_settings(config)

    # Verbose mode?
    common.verbose = verbose

    # Create the Web object
    web = Web(common, False, mode)

    # Start the Onion object
    onion = Onion(common)
    try:
        onion.connect(custom_settings=False, config=config, connect_timeout=connect_timeout)
    except KeyboardInterrupt:
        print("")
        sys.exit()
    except Exception as e:
        sys.exit(e.args[0])

    # Start the onionshare app
    try:
        common.settings.load()
        if not common.settings.get('public_mode'):
            web.generate_slug(common.settings.get('slug'))
        else:
            web.slug = None
        app = OnionShare(common, onion, local_only, autostop_timer)
        app.set_stealth(stealth)
        app.choose_port()
        # Delay the startup if a startup timer was set
        if autostart_timer > 0:
            # Can't set a schedule that is later than the auto-stop timer
            if app.autostop_timer > 0 and app.autostop_timer < autostart_timer:
                print("The auto-stop time can't be the same or earlier than the auto-start time. Please update it to start sharing.")
                sys.exit()

            app.start_onion_service(False, True)
            if common.settings.get('public_mode'):
                url = 'http://{0:s}'.format(app.onion_host)
            else:
                url = 'http://{0:s}/{1:s}'.format(app.onion_host, web.slug)
            schedule = datetime.now() + timedelta(seconds=autostart_timer)
            if mode == 'receive':
                print("Files sent to you appear in this folder: {}".format(common.settings.get('data_dir')))
                print('')
                print("Warning: Receive mode lets people upload files to your computer. Some files can potentially take control of your computer if you open them. Only open things from people you trust, or if you know what you are doing.")
                print('')
                if stealth:
                    print("Give this address and HidServAuth lineto your sender, and tell them it won't be accessible until: {}".format(schedule.strftime("%I:%M:%S%p, %b %d, %y")))
                    print(app.auth_string)
                else:
                    print("Give this address to your sender, and tell them it won't be accessible until: {}".format(schedule.strftime("%I:%M:%S%p, %b %d, %y")))
            else:
                if stealth:
                    print("Give this address and HidServAuth line to your recipient, and tell them it won't be accessible until: {}".format(schedule.strftime("%I:%M:%S%p, %b %d, %y")))
                    print(app.auth_string)
                else:
                    print("Give this address to your recipient, and tell them it won't be accessible until: {}".format(schedule.strftime("%I:%M:%S%p, %b %d, %y")))
            print(url)
            print('')
            print("Waiting for the scheduled time before starting...")
            app.onion.cleanup(False)
            time.sleep(autostart_timer)
            app.start_onion_service()
        else:
            app.start_onion_service()
    except KeyboardInterrupt:
        print("")
        sys.exit()
    except (TorTooOld, TorErrorProtocolError) as e:
        print("")
        print(e.args[0])
        sys.exit()

    if mode == 'share':
        # Prepare files to share
        print("Compressing files.")
        try:
            web.share_mode.set_file_info(filenames)
            app.cleanup_filenames += web.share_mode.cleanup_filenames
        except OSError as e:
            print(e.strerror)
            sys.exit(1)

        # Warn about sending large files over Tor
        if web.share_mode.download_filesize >= 157286400:  # 150mb
            print('')
            print("Warning: Sending a large share could take hours")
            print('')

    # Start OnionShare http service in new thread
    t = threading.Thread(target=web.start, args=(app.port, stay_open, common.settings.get('public_mode'), web.slug))
    t.daemon = True
    t.start()

    try:  # Trap Ctrl-C
        # Wait for web.generate_slug() to finish running
        time.sleep(0.2)

        # start auto-stop timer thread
        if app.autostop_timer > 0:
            app.autostop_timer_thread.start()

        # Save the web slug if we are using a persistent private key
        if common.settings.get('save_private_key'):
            if not common.settings.get('slug'):
                common.settings.set('slug', web.slug)
                common.settings.save()

        # Build the URL
        if common.settings.get('public_mode'):
            url = 'http://{0:s}'.format(app.onion_host)
        else:
            url = 'http://{0:s}/{1:s}'.format(app.onion_host, web.slug)

        print('')
        if autostart_timer > 0:
            print("Server started")
        else:
            if mode == 'receive':
                print("Files sent to you appear in this folder: {}".format(common.settings.get('data_dir')))
                print('')
                print("Warning: Receive mode lets people upload files to your computer. Some files can potentially take control of your computer if you open them. Only open things from people you trust, or if you know what you are doing.")
                print('')

                if stealth:
                    print("Give this address and HidServAuth to the sender:")
                    print(url)
                    print(app.auth_string)
                else:
                    print("Give this address to the sender:")
                    print(url)
            else:
                if stealth:
                    print("Give this address and HidServAuth line to the recipient:")
                    print(url)
                    print(app.auth_string)
                else:
                    print("Give this address to the recipient:")
                    print(url)
        print('')
        print("Press Ctrl+C to stop the server")

        # Wait for app to close
        while t.is_alive():
            if app.autostop_timer > 0:
                # if the auto-stop timer was set and has run out, stop the server
                if not app.autostop_timer_thread.is_alive():
                    if mode == 'share':
                        # If there were no attempts to download the share, or all downloads are done, we can stop
                        if web.share_mode.download_count == 0 or web.done:
                            print("Stopped because auto-stop timer ran out")
                            web.stop(app.port)
                            break
                    if mode == 'receive':
                        if web.receive_mode.upload_count == 0 or not web.receive_mode.uploads_in_progress:
                            print("Stopped because auto-stop timer ran out")
                            web.stop(app.port)
                            break
                        else:
                            web.receive_mode.can_upload = False
            # Allow KeyboardInterrupt exception to be handled with threads
            # https://stackoverflow.com/questions/3788208/python-threading-ignores-keyboardinterrupt-exception
            time.sleep(0.2)
    except KeyboardInterrupt:
        web.stop(app.port)
    finally:
        # Shutdown
        app.cleanup()
        onion.cleanup()

if __name__ == '__main__':
    main()