"""Custom page renderers for LMS app.

Handles rendering of profile pages.
"""
import re

import frappe
from frappe.website.page_renderers.base_renderer import BaseRenderer
from frappe.website.page_renderers.document_page import DocumentPage
from frappe.website.page_renderers.list_page import ListPage
from frappe.website.page_renderers.not_found_page import NotFoundPage
from frappe.website.page_renderers.print_page import PrintPage
from frappe.website.page_renderers.redirect_page import RedirectPage
from frappe.website.page_renderers.static_page import StaticPage
from frappe.website.page_renderers.template_page import TemplatePage
from frappe.website.page_renderers.web_form import WebFormPage


def get_profile_url(username):
	"""Returns the profile URL given username.

	The default URL prefix for profiles is /users, but tha can be customized.

	This functions looks at the current value from the config and generates
	the URL for the profile.
	"""
	return get_profile_url_prefix() + username


def get_profile_url_prefix():
	hooks = frappe.get_hooks("profile_url_prefix") or ["/users/"]
	return hooks[-1]


RE_INVALID_USERNAME = re.compile("[@!#$%^&*()<>?/\\|}{~:-]")


class ProfileRedirectPage(BaseRenderer):
	"""Renderer to redirect /profile_/foo to <profile_prefix>/foo.

	This is useful to redirect to profile pages from javascript as there is no
	easy to find the profile prefix.
	"""

	def can_render(self):
		return self.path.startswith("profile_/")

	def render(self):
		username = self.path[len("profile_/") :]
		frappe.flags.redirect_location = get_profile_url_prefix() + username
		return RedirectPage(self.path).render()


class ProfilePage(BaseRenderer):
	def __init__(self, path, http_status_code):
		super().__init__(path, http_status_code)
		self.renderer = None

	def can_render(self):
		"""if "." in self.path:
		return False"""

		# has prefix and path starts with prefix?
		prefix = get_profile_url_prefix().lstrip("/")
		if prefix and not self.path.startswith(prefix):
			return False

		# not a userpage?
		username = self.get_username()
		""" if RE_INVALID_USERNAME.search(username):
			return False """
		# if there is prefix then we can allow all usernames
		if prefix:
			return True

		# if we are having top-level usernames, then give preference to
		# the existing website_route_rules, web pages, web forms etc.

		# Don't handle any of the exsiting website_route_rules
		routes = [rule["to_route"] for rule in frappe.get_hooks("website_route_rules")]
		if self.path in routes:
			return False

		# if any of the existing renders can render, let them do
		renderers = [StaticPage, WebFormPage, DocumentPage, TemplatePage, ListPage, PrintPage]
		for renderer in renderers:
			renderer_instance = renderer(self.path, 200)
			if renderer_instance.can_render():
				self.renderer = renderer_instance
				return True

		return True

	def get_username(self):
		prefix = get_profile_url_prefix().lstrip("/")
		return self.path[len(prefix) :]

	def render(self):
		if self.renderer:
			return self.renderer.render()
		else:
			username = self.get_username()
			return render_portal_page("profiles/profile", username=username)


def render_portal_page(path, **kwargs):
	frappe.form_dict.update(kwargs)
	page = TemplatePage(path)
	return page.render()


class CoursePage(BaseRenderer):
	def __init__(self, path, http_status_code):
		super().__init__(path, http_status_code)
		self.renderer = None

	def can_render(self):
		return self.path.startswith("course")

	def render(self):
		if "learn" in self.path:
			prefix = self.path.split("/learn")[0]
			course_name = prefix.split("/")[1]
			lesson_index = self.path.split("/learn/")[1]
			chapter_number = lesson_index.split(".")[0]
			lesson_number = lesson_index.split(".")[1]

			frappe.flags.redirect_location = (
				f"/lms/courses/{course_name}/learn/{chapter_number}-{lesson_number}"
			)
			return RedirectPage(self.path).render()

		elif len(self.path.split("/")) > 1:
			course_name = self.path.split("/")[1]
			frappe.flags.redirect_location = f"/lms/courses/{course_name}"
			return RedirectPage(self.path).render()

		else:
			frappe.flags.redirect_location = "/lms/courses"
			return RedirectPage(self.path).render()