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from __future__ import print_function

import importlib
import os
import pydoc
import signal
import sys
import traceback
import weakref
from contextlib import contextmanager

from _hexchat_embedded import ffi, lib

if sys.version_info < (3, 0):
    from io import BytesIO as HelpEater
else:
    from io import StringIO as HelpEater

if not hasattr(sys, 'argv'):
    sys.argv = ['<hexchat>']

VERSION = b'2.0'  # Sync with hexchat.__version__
PLUGIN_NAME = ffi.new('char[]', b'Python')
PLUGIN_DESC = ffi.new('char[]', b'Python %d.%d scripting interface' % (sys.version_info[0], sys.version_info[1]))
PLUGIN_VERSION = ffi.new('char[]', VERSION)

# TODO: Constants should be screaming snake case
hexchat = None
local_interp = None
hexchat_stdout = None
plugins = set()


@contextmanager
def redirected_stdout():
    sys.stdout = sys.__stdout__
    sys.stderr = sys.__stderr__
    yield
    sys.stdout = hexchat_stdout
    sys.stderr = hexchat_stdout


if os.getenv('HEXCHAT_LOG_PYTHON'):
    def log(*args):
        with redirected_stdout():
            print(*args)

else:
    def log(*args):
        pass


class Stdout:
    def __init__(self):
        self.buffer = bytearray()

    def write(self, string):
        string = string.encode()
        idx = string.rfind(b'\n')
        if idx != -1:
            self.buffer += string[:idx]
            lib.hexchat_print(lib.ph, bytes(self.buffer))
            self.buffer = bytearray(string[idx + 1:])
        else:
            self.buffer += string

    def isatty(self):
        return False


class Attribute:
    def __init__(self):
        self.time = 0

    def __repr__(self):
        return '<Attribute object at {}>'.format(id(self))


class Hook:
    def __init__(self, plugin, callback, userdata, is_unload):
        self.is_unload = is_unload
        self.plugin = weakref.proxy(plugin)
        self.callback = callback
        self.userdata = userdata
        self.hexchat_hook = None
        self.handle = ffi.new_handle(weakref.proxy(self))

    def __del__(self):
        log('Removing hook', id(self))
        if self.is_unload is False:
            assert self.hexchat_hook is not None
            lib.hexchat_unhook(lib.ph, self.hexchat_hook)


if sys.version_info[0] == 2:
    def compile_file(data, filename):
        return compile(data, filename, 'exec', dont_inherit=True)


    def compile_line(string):
        try:
            return compile(string, '<string>', 'eval', dont_inherit=True)

        except SyntaxError:
            # For some reason `print` is invalid for eval
            # This will hide any return value though
            return compile(string, '<string>', 'exec', dont_inherit=True)
else:
    def compile_file(data, filename):
        return compile(data, filename, 'exec', optimize=2, dont_inherit=True)


    def compile_line(string):
        # newline appended to solve unexpected EOF issues
        return compile(string + '\n', '<string>', 'single', optimize=2, dont_inherit=True)


class Plugin:
    def __init__(self):
        self.ph = None
        self.name = ''
        self.filename = ''
        self.version = ''
        self.description = ''
        self.hooks = set()
        self.globals = {
            '__plugin': weakref.proxy(self),
            '__name__': '__main__',
        }

    def add_hook(self, callback, userdata, is_unload=False):
        hook = Hook(self, callback, userdata, is_unload=is_unload)
        self.hooks.add(hook)
        return hook

    def remove_hook(self, hook):
        for h in self.hooks:
            if id(h) == hook:
                ud = h.userdata
                self.hooks.remove(h)
                return ud

        log('Hook not found')
        return None

    def loadfile(self, filename):
        try:
            self.filename = filename
            with open(filename) as f:
                data = f.read()
            compiled = compile_file(data, filename)
            exec(compiled, self.globals)

            try:
                self.name = self.globals['__module_name__']

            except KeyError:
                lib.hexchat_print(lib.ph, b'Failed to load module: __module_name__ must be set')

                return False

            self.version = self.globals.get('__module_version__', '')
            self.description = self.globals.get('__module_description__', '')
            self.ph = lib.hexchat_plugingui_add(lib.ph, filename.encode(), self.name.encode(),
                                                self.description.encode(), self.version.encode(), ffi.NULL)

        except Exception as e:
            lib.hexchat_print(lib.ph, 'Failed to load module: {}'.format(e).encode())
            traceback.print_exc()
            return False

        return True

    def __del__(self):
        log('unloading', self.filename)
        for hook in self.hooks:
            if hook.is_unload is True:
                try:
                    hook.callback(hook.userdata)

                except Exception as e:
                    log('Failed to run hook:', e)
                    traceback.print_exc()

        del self.hooks
        if self.ph is not None:
            lib.hexchat_plugingui_remove(lib.ph, self.ph)


if sys.version_info[0] == 2:
    def __decode(string):
        return string

else:
    def __decode(string):
        return string.decode()


# There can be empty entries between non-empty ones so find the actual last value
def wordlist_len(words):
    for i in range(31, 1, -1):
        if ffi.string(words[i]):
            return i

    return 0


def create_wordlist(words):
    size = wordlist_len(words)
    return [__decode(ffi.string(words[i])) for i in range(1, size + 1)]


# This function only exists for compat reasons with the C plugin
# It turns the word list from print hooks into a word_eol list
# This makes no sense to do...
def create_wordeollist(words):
    words = reversed(words)
    accum = None
    ret = []
    for word in words:
        if accum is None:
            accum = word

        elif word:
            last = accum
            accum = ' '.join((word, last))

        ret.insert(0, accum)

    return ret


def to_cb_ret(value):
    if value is None:
        return 0

    return int(value)


@ffi.def_extern()
def _on_command_hook(word, word_eol, userdata):
    hook = ffi.from_handle(userdata)
    word = create_wordlist(word)
    word_eol = create_wordlist(word_eol)
    return to_cb_ret(hook.callback(word, word_eol, hook.userdata))


@ffi.def_extern()
def _on_print_hook(word, userdata):
    hook = ffi.from_handle(userdata)
    word = create_wordlist(word)
    word_eol = create_wordeollist(word)
    return to_cb_ret(hook.callback(word, word_eol, hook.userdata))


@ffi.def_extern()
def _on_print_attrs_hook(word, attrs, userdata):
    hook = ffi.from_handle(userdata)
    word = create_wordlist(word)
    word_eol = create_wordeollist(word)
    attr = Attribute()
    attr.time = attrs.server_time_utc
    return to_cb_ret(hook.callback(word, word_eol, hook.userdata, attr))


@ffi.def_extern()
def _on_server_hook(word, word_eol, userdata):
    hook = ffi.from_handle(userdata)
    word = create_wordlist(word)
    word_eol = create_wordlist(word_eol)
    return to_cb_ret(hook.callback(word, word_eol, hook.userdata))


@ffi.def_extern()
def _on_server_att