# coding=utf-8
from __future__ import absolute_import

__author__ = "Gina Häußge <osd@foosel.net>"
__license__ = 'GNU Affero General Public License http://www.gnu.org/licenses/agpl.html'
__copyright__ = "Copyright (C) 2014 The OctoPrint Project - Released under terms of the AGPLv3 License"

import uuid
from sockjs.tornado import SockJSRouter
from flask import Flask, render_template, send_from_directory, g, request, make_response
from flask.ext.login import LoginManager
from flask.ext.principal import Principal, Permission, RoleNeed, identity_loaded, UserNeed
from flask.ext.babel import Babel
from babel import Locale
from watchdog.observers import Observer

import os
import logging
import logging.config

SUCCESS = {}
NO_CONTENT = ("", 204)

app = Flask("octoprint")
babel = Babel(app)
debug = False

printer = None
gcodeManager = None
userManager = None
eventManager = None
loginManager = None
pluginManager = None

principals = Principal(app)
admin_permission = Permission(RoleNeed("admin"))
user_permission = Permission(RoleNeed("user"))

# only import the octoprint stuff down here, as it might depend on things defined above to be initialized already
from octoprint.printer import Printer, getConnectionOptions
from octoprint.settings import settings
import octoprint.gcodefiles as gcodefiles
import octoprint.users as users
import octoprint.events as events
import octoprint.plugin
import octoprint.timelapse
import octoprint._version
import octoprint.util

from . import util


UI_API_KEY = ''.join('%02X' % ord(z) for z in uuid.uuid4().bytes)

versions = octoprint._version.get_versions()
VERSION = versions['version']
BRANCH = versions['branch'] if 'branch' in versions else None
DISPLAY_VERSION = "%s (%s branch)" % (VERSION, BRANCH) if BRANCH else VERSION
del versions


def get_available_locale_identifiers(locales):
	result = set()

	# add available translations
	for locale in locales:
		result.add(locale.language)
		if locale.territory:
			# if a territory is specified, add that too
			result.add("%s_%s" % (locale.language, locale.territory))

	return result


LOCALES = [Locale.parse("en")] + babel.list_translations()
LANGUAGES = get_available_locale_identifiers(LOCALES)


@app.before_request
def before_request():
	g.locale = get_locale()


@babel.localeselector
def get_locale():
	if "l10n" in request.values:
		return Locale.negotiate([request.values["l10n"]], LANGUAGES)
	return request.accept_languages.best_match(LANGUAGES)


@app.route("/")
def index():
	settings_plugins = pluginManager.get_implementations(octoprint.plugin.SettingsPlugin)
	settings_plugin_template_vars = dict()
	for name, implementation in settings_plugins.items():
		settings_plugin_template_vars[name] = implementation.get_template_vars()

	asset_plugins = pluginManager.get_implementations(octoprint.plugin.AssetPlugin)
	asset_plugin_urls = dict()
	for name, implementation in asset_plugins.items():
		asset_plugin_urls[name] = implementation.get_assets()

	return render_template(
		"index.jinja2",
		webcamStream=settings().get(["webcam", "stream"]),
		enableTimelapse=(settings().get(["webcam", "snapshot"]) is not None and settings().get(["webcam", "ffmpeg"]) is not None),
		enableGCodeVisualizer=settings().get(["gcodeViewer", "enabled"]),
		enableTemperatureGraph=settings().get(["feature", "temperatureGraph"]),
		enableSystemMenu=settings().get(["system"]) is not None and settings().get(["system", "actions"]) is not None and len(settings().get(["system", "actions"])) > 0,
		enableAccessControl=userManager is not None,
		enableSdSupport=settings().get(["feature", "sdSupport"]),
		firstRun=settings().getBoolean(["server", "firstRun"]) and (userManager is None or not userManager.hasBeenCustomized()),
		debug=debug,
		version=VERSION,
		display_version=DISPLAY_VERSION,
		stylesheet=settings().get(["devel", "stylesheet"]),
		gcodeMobileThreshold=settings().get(["gcodeViewer", "mobileSizeThreshold"]),
		gcodeThreshold=settings().get(["gcodeViewer", "sizeThreshold"]),
		uiApiKey=UI_API_KEY,
		settingsPlugins=settings_plugin_template_vars,
		assetPlugins=asset_plugin_urls
	)


@app.route("/robots.txt")
def robotsTxt():
	return send_from_directory(app.static_folder, "robots.txt")


@app.route("/plugin_assets/<string:name>/<path:filename>")
def plugin_assets(name, filename):
	asset_plugins = pluginManager.get_implementations(octoprint.plugin.AssetPlugin)

	if not name in asset_plugins:
		return make_response(404)
	asset_plugin = asset_plugins[name]
	asset_folder = asset_plugin.get_asset_folder()
	if asset_folder is None:
		make_response(404)

	return send_from_directory(asset_folder, filename)


@identity_loaded.connect_via(app)
def on_identity_loaded(sender, identity):
	user = load_user(identity.id)
	if user is None:
		return

	identity.provides.add(UserNeed(user.get_name()))
	if user.is_user():
		identity.provides.add(RoleNeed("user"))
	if user.is_admin():
		identity.provides.add(RoleNeed("admin"))


def load_user(id):
	if userManager is not None:
		return userManager.findUser(id)
	return users.DummyUser()


#~~ startup code


class Server():
	def __init__(self, configfile=None, basedir=None, host="0.0.0.0", port=5000, debug=False, allowRoot=False, logConf=None):
		self._configfile = configfile
		self._basedir = basedir
		self._host = host
		self._port = port
		self._debug = debug
		self._allowRoot = allowRoot
		self._logConf = logConf
		self._server = None

	def run(self):
		if not self._allowRoot:
			self._checkForRoot()

		global printer
		global gcodeManager
		global userManager
		global eventManager
		global loginManager
		global pluginManager
		global debug

		from tornado.ioloop import IOLoop
		from tornado.web import Application

		debug = self._debug

		# first initialize the settings singleton and make sure it uses given configfile and basedir if available
		self._initSettings(self._configfile, self._basedir)

		# then initialize logging
		self._initLogging(self._debug, self._logConf)
		logger = logging.getLogger(__name__)

		logger.info("Starting OctoPrint %s" % DISPLAY_VERSION)

		eventManager = events.eventManager()
		gcodeManager = gcodefiles.GcodeManager()
		printer = Printer(gcodeManager)
		pluginManager = octoprint.plugin.plugin_manager(init=True)

		# configure additional template folders for jinja2
		template_plugins = pluginManager.get_implementations(octoprint.plugin.TemplatePlugin)
		additional_template_folders = []
		for plugin in template_plugins.values():
			folder = plugin.get_template_folder()
			if folder is not None:
				additional_template_folders.append(plugin.get_template_folder())

		import jinja2
		jinja_loader = jinja2.ChoiceLoader([
			app.jinja_loader,
			jinja2.FileSystemLoader(additional_template_folders)
		])
		app.jinja_loader = jinja_loader
		del jinja2

		# configure timelapse
		octoprint.timelapse.configureTimelapse()

		# setup command triggers
		events.CommandTrigger(printer)
		if self._debug:
			events.DebugEventListener()

		if settings().getBoolean(["accessControl", "enabled"]):
			userManagerName = settings().get(["accessControl", "userManager"])
			try:
				clazz = octoprint.util.getClass(userManagerName)
				userManager = clazz()
			except AttributeError, e:
				logger.exception("Could not instantiate user manager %s, will run with accessControl disabled!" % userManagerName)

		app.wsgi_app = util.ReverseProxied(
			app.wsgi_app,
			settings().get(["server", "reverseProxy", "prefixHeader"]),
			settings().get(["server", "reverseProxy", "schemeHeader"]),
			settings().get(["server", "reverseProxy", "prefixFallback"]),
			settings().get(["server", "reverseProxy", "prefixScheme"])
		)

		app.secret_key = "k3PuVYgtxNm8DXKKTw2nWmFQQun9qceV"
		loginManager = LoginManager()
		loginManager.session_protection = "strong"
		loginManager.user_callback = load_user
		if userManager is None:
			loginManager.anonymous_user = users.DummyUser
			principals.identity_loaders.appendleft(users.dummy_identity_loader)
		loginManager.init_app(app)

		if self._host is None:
			self._host = settings().get(["server", "host"])
		if self._port is None:
			self._port = settings().getInt(["server", "port"])

		app.debug = self._debug

		from octoprint.server.api import api

		# register API blueprint
		app.register_blueprint(api, url_prefix="/api")

		# also register any blueprints defined in BlueprintPlugins
		octoprint.plugin.call_plugin(octoprint.plugin.types.BlueprintPlugin,
		                             "get_blueprint",
		                             callback=lambda name, _, blueprint: app.register_blueprint(blueprint, url_prefix="/plugin/{name}".format(name=name)))

		self._router = SockJSRouter(self._createSocketConnection, "/sockjs")

		upload_suffixes = dict(name=settings().get(["server", "uploads", "nameSuffix"]), path=settings().get(["server", "uploads", "pathSuffix"]))
		self._tornado_app = Application(self._router.urls + [
			(r"/downloads/timelapse/([^/]*\.mpg)", util.tornado.LargeResponseHandler, dict(path=settings().getBaseFolder("timelapse"), as_attachment=True)),
			(r"/downloads/files/local/([^/]*\.(gco|gcode))", util.tornado.LargeResponseHandler, dict(path=settings().getBaseFolder("uploads"), as_attachment=True)),
			(r"/downloads/logs/([^/]*)", util.tornado.LargeResponseHandler, dict(path=settings().getBaseFolder("logs"), as_attachment=True, access_validation=util.tornado.access_validation_factory(app, loginManager, util.flask.admin_validator))),
			(r"/downloads/camera/current", util.tornado.UrlForwardHandler, dict(url=settings().get(["webcam", "snapshot"]), as_attachment=True, access_validation=util.tornado.access_validation_factory(app, loginManager, util.flask.user_validator))),
			(r".*", util.tornado.UploadStorageFallbackHandler, dict(fallback=util.tornado.WsgiInputContainer(app.wsgi_app), file_prefix="octoprint-file-upload-", file_suffix=".tmp", suffixes=upload_suffixes))
		])
		max_body_sizes = [
			("POST", r"/api/files/([^/]*)", settings().getInt(["server", "uploads", "maxSize"]))
		]
		self._server = util.tornado.CustomHTTPServer(self._tornado_app, max_body_sizes=max_body_sizes, default_max_body_size=settings().getInt(["server", "maxSize"]))
		self._server.listen(self._port, address=self._host)

		eventManager.fire(events.Events.STARTUP)
		if settings().getBoolean(["serial", "autoconnect"]):
			(port, baudrate) = settings().get(["serial", "port"]), settings().getInt(["serial", "baudrate"])
			connectionOptions = getConnectionOptions()
			if port in connectionOptions["ports"]:
				printer.connect(port, baudrate)

		# start up watchdogs
		observer = Observer()
		observer.schedule(util.watchdog.GcodeWatchdogHandler(gcodeManager, printer), settings().getBaseFolder("watched"))
		observer.schedule(util.watchdog.UploadCleanupWatchdogHandler(gcodeManager), settings().getBaseFolder("uploads"))
		observer.start()

		# now it's the turn of the startup plugins
		octoprint.plugin.call_plugin(octoprint.plugin.StartupPlugin,
		                             "on_startup",
		                             args=(self._host, self._port))

		logger.info("Listening on http://%s:%d" % (self._host, self._port))
		try:
			IOLoop.instance().start()
		except KeyboardInterrupt:
			logger.info("Goodbye!")
		except:
			logger.fatal("Now that is embarrassing... Something really really went wrong here. Please report this including the stacktrace below in OctoPrint's bugtracker. Thanks!")
			logger.exception("Stacktrace follows:")
		finally:
			observer.stop()
		observer.join()

	def _createSocketConnection(self, session):
		global printer, gcodeManager, userManager, eventManager
		return util.sockjs.PrinterStateConnection(printer, gcodeManager, userManager, eventManager, session)

	def _checkForRoot(self):
		if "geteuid" in dir(os) and os.geteuid() == 0:
			exit("You should not run OctoPrint as root!")

	def _initSettings(self, configfile, basedir):
		settings(init=True, basedir=basedir, configfile=configfile)

	def _initLogging(self, debug, logConf=None):
		defaultConfig = {
			"version": 1,
			"formatters": {
				"simple": {
					"format": "%(asctime)s - %(name)s - %(levelname)s - %(message)s"
				}
			},
			"handlers": {
				"console": {
					"class": "logging.StreamHandler",
					"level": "DEBUG",
					"formatter": "simple",
					"stream": "ext://sys.stdout"
				},
				"file": {
					"class": "logging.handlers.TimedRotatingFileHandler",
					"level": "DEBUG",
					"formatter": "simple",
					"when": "D",
					"backupCount": "1",
					"filename": os.path.join(settings().getBaseFolder("logs"), "octoprint.log")
				},
				"serialFile": {
					"class": "logging.handlers.RotatingFileHandler",
					"level": "DEBUG",
					"formatter": "simple",
					"maxBytes": 2 * 1024 * 1024, # let's limit the serial log to 2MB in size
					"filename": os.path.join(settings().getBaseFolder("logs"), "serial.log")
				}
			},
			"loggers": {
				"SERIAL": {
					"level": "CRITICAL",
					"handlers": ["serialFile"],
					"propagate": False
				}
			},
			"root": {
				"level": "INFO",
				"handlers": ["console", "file"]
			}
		}

		if debug:
			defaultConfig["root"]["level"] = "DEBUG"

		if logConf is None:
			logConf = os.path.join(settings().settings_dir, "logging.yaml")

		configFromFile = {}
		if os.path.exists(logConf) and os.path.isfile(logConf):
			import yaml
			with open(logConf, "r") as f:
				configFromFile = yaml.safe_load(f)

		config = octoprint.util.dict_merge(defaultConfig, configFromFile)
		logging.config.dictConfig(config)

		if settings().getBoolean(["serial", "log"]):
			# enable debug logging to serial.log
			logging.getLogger("SERIAL").setLevel(logging.DEBUG)
			logging.getLogger("SERIAL").debug("Enabling serial logging")

if __name__ == "__main__":
	server = Server()
	server.run()