# Copyright (c) 2015, Frappe Technologies Pvt. Ltd. and Contributors
# MIT License. See license.txt

from __future__ import unicode_literals
import frappe
from frappe import _
import frappe.utils
import frappe.sessions
import frappe.desk.form.run_method
from frappe.utils.response import build_response
from frappe.api import validate_auth
from frappe.utils import cint
from frappe.core.doctype.server_script.server_script_utils import run_server_script_api
from werkzeug.wrappers import Response
from six import string_types

ALLOWED_MIMETYPES = ('image/png', 'image/jpeg', 'application/pdf', 'application/msword',
			'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
			'application/vnd.ms-excel', 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
			'application/vnd.oasis.opendocument.text', 'application/vnd.oasis.opendocument.spreadsheet')


def handle():
	"""handle request"""
	validate_auth()
	cmd = frappe.local.form_dict.cmd
	data = None

	if cmd!='login':
		data = execute_cmd(cmd)

	# data can be an empty string or list which are valid responses
	if data is not None:
		if isinstance(data, Response):
			# method returns a response object, pass it on
			return data

		# add the response to `message` label
		frappe.response['message'] = data

	return build_response("json")

def execute_cmd(cmd, from_async=False):
	"""execute a request as python module"""
	for hook in frappe.get_hooks("override_whitelisted_methods", {}).get(cmd, []):
		# override using the first hook
		cmd = hook
		break

	# via server script
	if run_server_script_api(cmd):
		return None

	try:
		method = get_attr(cmd)
	except Exception as e:
		frappe.throw(_('Invalid Method'))

	if from_async:
		method = method.queue

	is_whitelisted(method)
	is_valid_http_method(method)

	return frappe.call(method, **frappe.form_dict)

def is_valid_http_method(method):
	http_method = frappe.local.request.method

	if http_method not in frappe.allowed_http_methods_for_whitelisted_func[method]:
		frappe.throw(_("Not permitted"), frappe.PermissionError)

def is_whitelisted(method):
	# check if whitelisted
	if frappe.session['user'] == 'Guest':
		if (method not in frappe.guest_methods):
			frappe.throw(_("Not permitted"), frappe.PermissionError)

		if method not in frappe.xss_safe_methods:
			# strictly sanitize form_dict
			# escapes html characters like <> except for predefined tags like a, b, ul etc.
			for key, value in frappe.form_dict.items():
				if isinstance(value, string_types):
					frappe.form_dict[key] = frappe.utils.sanitize_html(value)

	else:
		if not method in frappe.whitelisted:
			frappe.throw(_("Not permitted"), frappe.PermissionError)

@frappe.whitelist(allow_guest=True)
def version():
	return frappe.__version__

@frappe.whitelist()
def runserverobj(method, docs=None, dt=None, dn=None, arg=None, args=None):
	frappe.desk.form.run_method.runserverobj(method, docs=docs, dt=dt, dn=dn, arg=arg, args=args)

@frappe.whitelist(allow_guest=True)
def logout():
	frappe.local.login_manager.logout()
	frappe.db.commit()

@frappe.whitelist(allow_guest=True)
def web_logout():
	frappe.local.login_manager.logout()
	frappe.db.commit()
	frappe.respond_as_web_page(_("Logged Out"), _("You have been successfully logged out"),
		indicator_color='green')

@frappe.whitelist(allow_guest=True)
def run_custom_method(doctype, name, custom_method):
	"""cmd=run_custom_method&doctype={doctype}&name={name}&custom_method={custom_method}"""
	doc = frappe.get_doc(doctype, name)
	if getattr(doc, custom_method, frappe._dict()).is_whitelisted:
		frappe.call(getattr(doc, custom_method), **frappe.local.form_dict)
	else:
		frappe.throw(_("Not permitted"), frappe.PermissionError)

@frappe.whitelist()
def uploadfile():
	ret = None

	try:
		if frappe.form_dict.get('from_form'):
			try:
				ret = frappe.get_doc({
					"doctype": "File",
					"attached_to_name": frappe.form_dict.docname,
					"attached_to_doctype": frappe.form_dict.doctype,
					"attached_to_field": frappe.form_dict.docfield,
					"file_url": frappe.form_dict.file_url,
					"file_name": frappe.form_dict.filename,
					"is_private": frappe.utils.cint(frappe.form_dict.is_private),
					"content": frappe.form_dict.filedata,
					"decode": True
				})
				ret.save()
			except frappe.DuplicateEntryError:
				# ignore pass
				ret = None
				frappe.db.rollback()
		else:
			if frappe.form_dict.get('method'):
				method = frappe.get_attr(frappe.form_dict.method)
				is_whitelisted(method)
				ret = method()
	except Exception:
		frappe.errprint(frappe.utils.get_traceback())
		frappe.response['http_status_code'] = 500
		ret = None

	return ret

@frappe.whitelist(allow_guest=True)
def upload_file():
	user = None
	if frappe.session.user == 'Guest':
		if frappe.get_system_settings('allow_guests_to_upload_files'):
			ignore_permissions = True
		else:
			return
	else:
		user = frappe.get_doc("User", frappe.session.user)
		ignore_permissions = False

	files = frappe.request.files
	is_private = frappe.form_dict.is_private
	doctype = frappe.form_dict.doctype
	docname = frappe.form_dict.docname
	fieldname = frappe.form_dict.fieldname
	file_url = frappe.form_dict.file_url
	folder = frappe.form_dict.folder or 'Home'
	method = frappe.form_dict.method
	content = None
	filename = None

	if 'file' in files:
		file = files['file']
		content = file.stream.read()
		filename = file.filename

	frappe.local.uploaded_file = content
	frappe.local.uploaded_filename = filename

	if frappe.session.user == 'Guest' or (user and not user.has_desk_access()):
		import mimetypes
		filetype = mimetypes.guess_type(filename)[0]
		if filetype not in ALLOWED_MIMETYPES:
			frappe.throw(_("You can only upload JPG, PNG, PDF, or Microsoft documents."))

	if method:
		method = frappe.get_attr(method)
		is_whitelisted(method)
		return method()
	else:
		ret = frappe.get_doc({
			"doctype": "File",
			"attached_to_doctype": doctype,
			"attached_to_name": docname,
			"attached_to_field": fieldname,
			"folder": folder,
			"file_name": filename,
			"file_url": file_url,
			"is_private": cint(is_private),
			"content": content
		})
		ret.save(ignore_permissions=ignore_permissions)
		return ret


def get_attr(cmd):
	"""get method object from cmd"""
	if '.' in cmd:
		method = frappe.get_attr(cmd)
	else:
		method = globals()[cmd]
	frappe.log("method:" + cmd)
	return method

@frappe.whitelist(allow_guest = True)
def ping():
	return "pong"