# -*- coding: utf-8 -*-
# Copyright (c) 2015, Frappe Technologies Pvt. Ltd. and Contributors
# MIT License. See license.txt
from __future__ import unicode_literals

import os
from six import iteritems
import logging

from werkzeug.wrappers import Request
from werkzeug.local import LocalManager
from werkzeug.exceptions import HTTPException, NotFound
from werkzeug.contrib.profiler import ProfilerMiddleware
from werkzeug.wsgi import SharedDataMiddleware

import frappe
import frappe.handler
import frappe.auth
import frappe.api
import frappe.async
import frappe.utils.response
import frappe.website.render
from frappe.utils import get_site_name
from frappe.middlewares import StaticDataMiddleware
from frappe.utils.error import make_error_snapshot
from frappe.core.doctype.communication.comment import update_comments_in_parent_after_request
from frappe import _

# imports - third-party imports
import pymysql
from pymysql.constants import ER

# imports - module imports

local_manager = LocalManager([frappe.local])

_site = None
_sites_path = os.environ.get("SITES_PATH", ".")

class RequestContext(object):

	def __init__(self, environ):
		self.request = Request(environ)

	def __enter__(self):
		init_request(self.request)

	def __exit__(self, type, value, traceback):
		frappe.destroy()


@Request.application
def application(request):
	response = None

	try:
		rollback = True

		init_request(request)

		if frappe.local.form_dict.cmd:
			response = frappe.handler.handle()

		elif frappe.request.path.startswith("/api/"):
			if frappe.local.form_dict.data is None:
					frappe.local.form_dict.data = request.get_data()
			response = frappe.api.handle()

		elif frappe.request.path.startswith('/backups'):
			response = frappe.utils.response.download_backup(request.path)

		elif frappe.request.path.startswith('/private/files/'):
			response = frappe.utils.response.download_private_file(request.path)

		elif frappe.local.request.method in ('GET', 'HEAD', 'POST'):
			response = frappe.website.render.render()

		else:
			raise NotFound

	except HTTPException as e:
		return e

	except frappe.SessionStopped as e:
		response = frappe.utils.response.handle_session_stopped()

	except Exception as e:
		response = handle_exception(e)

	else:
		rollback = after_request(rollback)

	finally:
		if frappe.local.request.method in ("POST", "PUT") and frappe.db and rollback:
			frappe.db.rollback()

		# set cookies
		if response and hasattr(frappe.local, 'cookie_manager'):
			frappe.local.cookie_manager.flush_cookies(response=response)

		frappe.destroy()

	return response

def init_request(request):
	frappe.local.request = request
	frappe.local.is_ajax = frappe.get_request_header("X-Requested-With")=="XMLHttpRequest"

	site = _site or request.headers.get('X-Frappe-Site-Name') or get_site_name(request.host)
	frappe.init(site=site, sites_path=_sites_path)

	if not (frappe.local.conf and frappe.local.conf.db_name):
		# site does not exist
		raise NotFound

	if frappe.local.conf.get('maintenance_mode'):
		raise frappe.SessionStopped

	make_form_dict(request)

	frappe.local.http_request = frappe.auth.HTTPRequest()

def make_form_dict(request):
	import json

	if request.content_type == 'application/json' and request.data:
		args = json.loads(request.data)
	else:
		args = request.form or request.args

	frappe.local.form_dict = frappe._dict({ k:v[0] if isinstance(v, (list, tuple)) else v \
		for k, v in iteritems(args) })

	if "_" in frappe.local.form_dict:
		# _ is passed by $.ajax so that the request is not cached by the browser. So, remove _ from form_dict
		frappe.local.form_dict.pop("_")

def handle_exception(e):
	response = None
	http_status_code = getattr(e, "http_status_code", 500)
	return_as_message = False

	if frappe.local.is_ajax or 'application/json' in frappe.get_request_header('Accept'):
		# handle ajax responses first
		# if the request is ajax, send back the trace or error message
		response = frappe.utils.response.report_error(http_status_code)

	elif (http_status_code==500
		and isinstance(e, pymysql.InternalError)
		and e.args[0] in (ER.LOCK_WAIT_TIMEOUT, ER.LOCK_DEADLOCK)):
			http_status_code = 508

	elif http_status_code==401:
		frappe.respond_as_web_page(_("Session Expired"),
			_("Your session has expired, please login again to continue."),
			http_status_code=http_status_code,  indicator_color='red')
		return_as_message = True

	elif http_status_code==403:
		frappe.respond_as_web_page(_("Not Permitted"),
			_("You do not have enough permissions to complete the action"),
			http_status_code=http_status_code,  indicator_color='red')
		return_as_message = True

	elif http_status_code==404:
		frappe.respond_as_web_page(_("Not Found"),
			_("The resource you are looking for is not available"),
			http_status_code=http_status_code,  indicator_color='red')
		return_as_message = True

	else:
		traceback = "<pre>"+frappe.get_traceback()+"</pre>"
		if frappe.local.flags.disable_traceback:
			traceback = ""

		frappe.respond_as_web_page("Server Error",
			traceback, http_status_code=http_status_code,
			indicator_color='red', width=640)
		return_as_message = True

	if e.__class__ == frappe.AuthenticationError:
		if hasattr(frappe.local, "login_manager"):
			frappe.local.login_manager.clear_cookies()

	if http_status_code >= 500:
		frappe.logger().error('Request Error', exc_info=True)
		make_error_snapshot(e)

	if return_as_message:
		response = frappe.website.render.render("message",
			http_status_code=http_status_code)

	return response

def after_request(rollback):
	if (frappe.local.request.method in ("POST", "PUT") or frappe.local.flags.commit) and frappe.db:
		if frappe.db.transaction_writes:
			frappe.db.commit()
			rollback = False

	# update session
	if getattr(frappe.local, "session_obj", None):
		updated_in_db = frappe.local.session_obj.update()
		if updated_in_db:
			frappe.db.commit()
			rollback = False

	update_comments_in_parent_after_request()

	return rollback

application = local_manager.make_middleware(application)

def serve(port=8000, profile=False, site=None, sites_path='.'):
	global application, _site, _sites_path
	_site = site
	_sites_path = sites_path

	from werkzeug.serving import run_simple

	if profile:
		application = ProfilerMiddleware(application, sort_by=('cumtime', 'calls'))

	if not os.environ.get('NO_STATICS'):
		application = SharedDataMiddleware(application, {
			'/assets': os.path.join(sites_path, 'assets'),
		})

		application = StaticDataMiddleware(application, {
			'/files': os.path.abspath(sites_path)
		})

	application.debug = True
	application.config = {
		'SERVER_NAME': 'localhost:8000'
	}

	in_test_env = os.environ.get('CI')
	if in_test_env:
		log = logging.getLogger('werkzeug')
		log.setLevel(logging.ERROR)

	run_simple('0.0.0.0', int(port), application,
		use_reloader=not in_test_env,
		use_debugger=not in_test_env,
		use_evalex=not in_test_env,
		threaded=True)