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

from __future__ import unicode_literals
import frappe
from frappe import _
from frappe.desk.form.document_follow import follow_document
from frappe.desk.doctype.notification_log.notification_log import enqueue_create_notification
from frappe.utils import cint

@frappe.whitelist()
def add(doctype, name, user=None, read=1, write=0, share=0, everyone=0, flags=None):
	"""Share the given document with a user."""
	if not user:
		user = frappe.session.user

	if not (flags or {}).get("ignore_share_permission"):
		check_share_permission(doctype, name)

	share_name = get_share_name(doctype, name, user, everyone)

	if share_name:
		doc = frappe.get_doc("DocShare", share_name)
	else:
		doc = frappe.new_doc("DocShare")
		doc.update({
			"user": user,
			"share_doctype": doctype,
			"share_name": name,
			"everyone": cint(everyone)
		})

	if flags:
		doc.flags.update(flags)

	doc.update({
		# always add read, since you are adding!
		"read": 1,
		"write": cint(write),
		"share": cint(share)
	})

	doc.save(ignore_permissions=True)
	notify_assignment(user, doctype, name, everyone)

	follow_document(doctype, name, user)

	return doc

def remove(doctype, name, user, flags=None):
	share_name = frappe.db.get_value("DocShare", {"user": user, "share_name": name,
		"share_doctype": doctype})

	if share_name:
		frappe.delete_doc("DocShare", share_name, flags=flags)

@frappe.whitelist()
def set_permission(doctype, name, user, permission_to, value=1, everyone=0):
	"""Set share permission."""
	check_share_permission(doctype, name)

	share_name = get_share_name(doctype, name, user, everyone)
	value = int(value)

	if not share_name:
		if value:
			share = add(doctype, name, user, everyone=everyone, **{permission_to: 1})
		else:
			# no share found, nothing to remove
			share = {}
			pass
	else:
		share = frappe.get_doc("DocShare", share_name)
		share.flags.ignore_permissions = True
		share.set(permission_to, value)

		if not value:
			# un-set higher-order permissions too
			if permission_to=="read":
				share.read = share.write = share.share = 0

		share.save()

		if not (share.read or share.write or share.share):
			share.delete()
			share = {}

	return share

@frappe.whitelist()
def get_users(doctype, name):
	"""Get list of users with which this document is shared"""
	return frappe.db.sql("""select
			`name`, `user`, `read`, `write`, `share`, `everyone`
		from
			`tabDocShare`
		where
			share_doctype=%s and share_name=%s""",
		(doctype, name), as_dict=True)

def get_shared(doctype, user=None, rights=None):
	"""Get list of shared document names for given user and DocType.

	:param doctype: DocType of which shared names are queried.
	:param user: User for which shared names are queried.
	:param rights: List of rights for which the document is shared. List of `read`, `write`, `share`"""

	if not user:
		user = frappe.session.user

	if not rights:
		rights = ["read"]

	filters = [[right, '=', 1] for right in rights]
	filters += [['share_doctype', '=', doctype]]
	or_filters = [['user', '=', user]]
	if user != 'Guest':
		or_filters += [['everyone', '=', 1]]

	shared_docs = frappe.db.get_all('DocShare',
		fields=['share_name'],
		filters=filters,
		or_filters=or_filters)

	return [doc.share_name for doc in shared_docs]

def get_shared_doctypes(user=None):
	"""Return list of doctypes in which documents are shared for the given user."""
	if not user:
		user = frappe.session.user

	return frappe.db.sql_list("select distinct share_doctype from tabDocShare where (user=%s or everyone=1)", user)

def get_share_name(doctype, name, user, everyone):
	if cint(everyone):
		share_name = frappe.db.get_value("DocShare", {"everyone": 1, "share_name": name,
			"share_doctype": doctype})
	else:
		share_name = frappe.db.get_value("DocShare", {"user": user, "share_name": name,
			"share_doctype": doctype})

	return share_name

def check_share_permission(doctype, name):
	"""Check if the user can share with other users"""
	if not frappe.has_permission(doctype, ptype="share", doc=name):
		frappe.throw(_("No permission to {0} {1} {2}".format("share", doctype, name)), frappe.PermissionError)

def notify_assignment(shared_by, doctype, doc_name, everyone):

	if not (shared_by and doctype and doc_name) or everyone: return

	from frappe.utils import get_fullname

	title_field = frappe.get_meta(doctype).get_title_field()
	title = doc_name if title_field == "name" else \
		frappe.db.get_value(doctype, doc_name, title_field)

	reference_user = get_fullname(frappe.session.user)
	notification_message = _('{0} shared a document {1} {2} with you').format(
		frappe.bold(reference_user), frappe.bold(doctype), frappe.bold(title))

	notification_doc = {
		'type': 'Share',
		'document_type': doctype,
		'subject': notification_message,
		'document_name': doc_name,
		'from_user': frappe.session.user
	}

	enqueue_create_notification(shared_by, notification_doc)