import collections
import glob
import os
import sys
import traceback

if 'mtimes' not in globals():
    mtimes = {}

if 'lastfiles' not in globals():
    lastfiles = set()


def format_plug(plug, lpad=0, width=40):
    out = ' ' * lpad + '%s:%s:%s' % (plug[0])
    if len(plug) == 3 and 'hook' in plug[2]:
        out += '%s%s' % (' ' * (width - len(out)), plug[2]['hook'])
    return out


def reload(init=False):
    if init:
        bot.plugs = collections.defaultdict(lambda: [])

    for filename in glob.glob(os.path.join("core", "*.py")):
        mtime = os.stat(filename).st_mtime
        if mtime != mtimes.get(filename):
            mtimes[filename] = mtime
            try:
                eval(compile(open(filename, 'U').read(), filename, 'exec'),
                        globals())
            except Exception:
                traceback.print_exc(Exception)
                if init:        # stop if there's a syntax error in a core
                    sys.exit()  # script on startup
                continue

            if filename == os.path.join('core', 'reload.py'):
                reload(init=init)
                return

    fileset = set(glob.glob(os.path.join('plugins', '*py')))
    for name, data in bot.plugs.iteritems():  # remove deleted/moved plugins
        bot.plugs[name] = filter(lambda x: x[0][0] in fileset, data)

    for filename in fileset:
        mtime = os.stat(filename).st_mtime
        if mtime != mtimes.get(filename):
            mtimes[filename] = mtime
            try:
                code = compile(open(filename, 'U').read(), filename, 'exec')
                namespace = {}
                eval(code, namespace)
            except Exception:
                traceback.print_exc(Exception)
                continue

            # remove plugins already loaded from this filename
            for name, data in bot.plugs.iteritems():

                if name == 'tee':  # signal tee trampolines to stop
                    for csig, func, args in data:
                        if csig[0] == filename:
                            func._iqueue.put(StopIteration)

                bot.plugs[name] = filter(lambda x: x[0][0] != filename, data)

            for obj in namespace.itervalues():
                if hasattr(obj, '_skybot_hook'):  # check for magic
                    for type, data in obj._skybot_hook:
                        bot.plugs[type] += [data]

                        if not init:
                            print '### new plugin (type: %s) loaded:' % \
                                    type, format_plug(data)

    if init:
        print '  plugin listing:'
        for type, plugs in sorted(bot.plugs.iteritems()):
            print '    %s:' % type
            for plug in plugs:
                out = '      %s:%s:%s' % (plug[0])
                print format_plug(plug, lpad=6)
        print