from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
from __future__ import unicode_literals

import os
import sys
from subprocess import check_call, CalledProcessError

import tst
from tst.colors import *
from tst.utils import cprint

EXTERNALS = [
    "test",
    "status",
    "new",
    "delete",
]
DEFAULT_COMMAND = "test"


def run_external_command(command, args):
    script_name = os.path.expanduser("tst-%s" % command)
    args.insert(0, script_name)
    try:
        check_call(args)
    except CalledProcessError:
        pass
    except OSError:
        print("tst: couldn't run command '%s'" % command, file=sys.stderr)


def identify_and_run_command(args):
    from distutils.spawn import find_executable
    if args and (args[0] in EXTERNALS):
        command_name = args.pop(0)
        run_external_command(command_name, args)

    elif args and find_executable('tst-%s' % args[0]):
        command_name = args.pop(0)
        run_external_command(command_name, args)
            
    else: # neither internal, nor external command!?
        command_name = DEFAULT_COMMAND
        run_external_command(command_name, args)

    return command_name


def dispatcher(args):
    possible_command = args[0] if args else None
    if possible_command in ['--version', '-v', 'version']:
        import tst.commands.version as version
        version.main()

    elif possible_command == 'info':
        import tst.commands.info as info
        info.main()

    elif possible_command == 'login':
        import tst.commands.login as login
        login.main()

    elif possible_command == 'ls':
        import tst.commands.ls as ls
        ls.main()

    elif possible_command == 'commit':
        dirtype = tst.dirtype()
        if dirtype == "old:activity":
            cprint(LRED, "┌──────────────────────────────────────────────────────────┐")
            cprint(LRED, "│ Oops...                                                  │")
            cprint(LRED, "│                                                          │")
            cprint(LRED, "│ This directory contains an activity in an old format. It │")
            cprint(LRED, "│ is no longer supported, however. Consider discarding     │")
            cprint(LRED, "│ this directory and performing a new checkout of the same │")
            cprint(LRED, "│ activity from the source site to have it updated to the  │")
            cprint(LRED, "│ latest version and current format.                       │")
            cprint(LRED, "└──────────────────────────────────────────────────────────┘")
            sys.exit(1)

        elif dirtype in ["assignment", None]:
            import tst.commands.commit as commit
            commit.main()

        else:
            cprint(LRED, "No assignment found in this directory")
            sys.exit(1)

    elif possible_command == 'checkout':
        dirtype = tst.dirtype()
        if dirtype == "old:activity":
            cprint(YELLOW, "┌─────────────────────────────────────────────────────────┐")
            cprint(YELLOW, "│ IMPORTANT                                               │")
            cprint(YELLOW, "│                                                         │")
            cprint(YELLOW, "│ This is an old style activity. The old checkout command │")
            cprint(YELLOW, "│ will be used.                                           │")
            cprint(YELLOW, "└─────────────────────────────────────────────────────────┘")
            run_external_command("checkout", args[1:])

        elif dirtype not in [None, "assignment"]:
            cprint(LRED, "┌───────────────────────────────────────────────┐")
            cprint(LRED, "│ checkout cannot be executed in this directory │")
            cprint(LRED, "│                                               │")
            cprint(LRED, "│ Currently, the checkout command must be used  │")
            cprint(LRED, "│ in a non tst directory.                       │")
            cprint(LRED, "└───────────────────────────────────────────────┘")

        else:
            import tst.commands.checkout as checkout
            checkout.main()

    elif possible_command == 'update':
        cprint(LRED, "┌─────────────────────────────────────┐")
        cprint(LRED, "│ update is deprecated                │")
        cprint(LRED, "│                                     │")
        cprint(LRED, "│ Use pip to update tst:              │")
        cprint(LRED, "│ $ pip install tst --upgrade --user  │")
        cprint(LRED, "└─────────────────────────────────────┘")

    elif possible_command == 'config':
        cprint(LRED, "┌────────────────────────────────────────────────────┐")
        cprint(LRED, "│ config is deprecated                               │")
        cprint(LRED, "│                                                    │")
        cprint(LRED, "│ Edit ~/.tst/config.yaml directly to configure tst. │")
        cprint(LRED, "│ See documentation to see existing options.         │")
        cprint(LRED, "└────────────────────────────────────────────────────┘")

    else:
        command = identify_and_run_command(args)


def main():
    try:
        args = sys.argv[:]
        args.pop(0) # pop dispatcher name
        config = tst.get_config()
        dispatcher(args) 
    except KeyboardInterrupt:
        cprint(LRED, "\nUser interruption")

@@ -164,16 +164,31 @@
 ort sys%0A
+import logging%0A
 from sub
@@ -300,16 +300,277 @@
 cprint%0A%0A
+log = logging.getLogger('dispatcher')%0Ahandler_file = logging.FileHandler(os.path.expanduser('~/.tst/logs'))%0Ahandler_file.setFormatter(logging.Formatter('%25(asctime)s%7C%25(name)s%7C%25(levelname)s%7C%25(message)s'))%0Alog.addHandler(handler_file)%0Alog.setLevel(logging.DEBUG)%0A%0A
 EXTERNAL

add log support to commands/dispatcher.py