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

import io
import os
import re

import frappe
from frappe.website.utils import extract_title
from werkzeug.routing import Map, Rule, NotFound

def get_page_info_from_web_page_with_dynamic_routes(path):
	'''
	Query Web Page with dynamic_route = 1 and evaluate if any of the routes match
	'''
	rules, page_info = [], {}

	# build rules from all web page with `dynamic_route = 1`
	for d in frappe.get_all('Web Page', fields = ['name', 'route', 'modified'],
		filters = dict(published = 1, dynamic_route=1)):
		rules.append(Rule('/' + d.route, endpoint = d.name))
		d.doctype = 'Web Page'
		page_info[d.name] = d

	end_point = evaluate_dynamic_routes(rules, path)
	if end_point:
		return page_info[end_point]

def evaluate_dynamic_routes(rules, path):
	'''
	Use Werkzeug routing to evaluate dynamic routes like /project/<name>
	https://werkzeug.palletsprojects.com/en/1.0.x/routing/
	'''
	route_map = Map(rules)
	endpoint = None

	if hasattr(frappe.local, 'request') and frappe.local.request.environ:
		urls = route_map.bind_to_environ(frappe.local.request.environ)
		try:
			endpoint, args = urls.match("/" + path)
			path = endpoint
			if args:
				# don't cache when there's a query string!
				frappe.local.no_cache = 1
				frappe.local.form_dict.update(args)

		except NotFound:
			pass

	return endpoint

def get_pages(app=None):
	'''Get all pages. Called for docs / sitemap'''

	def _build(app):
		pages = {}

		if app:
			apps = [app]
		else:
			apps = frappe.local.flags.web_pages_apps or frappe.get_installed_apps()

		for app in apps:
			app_path = frappe.get_app_path(app)

			for start in get_start_folders():
				pages.update(get_pages_from_path(start, app, app_path))

		return pages

	return frappe.cache().get_value('website_pages', lambda: _build(app))

def get_pages_from_path(start, app, app_path):
	pages = {}
	start_path = os.path.join(app_path, start)
	if os.path.exists(start_path):
		for basepath, folders, files in os.walk(start_path):
			# add missing __init__.py
			if not '__init__.py' in files:
				open(os.path.join(basepath, '__init__.py'), 'a').close()

			for fname in files:
				fname = frappe.utils.cstr(fname)
				if not '.' in fname:
					continue
				page_name, extn = fname.rsplit(".", 1)
				if extn in ('js', 'css') and os.path.exists(os.path.join(basepath, page_name + '.html')):
					# js, css is linked to html, skip
					continue

				if extn in ("html", "xml", "js", "css", "md"):
					page_info = get_page_info(os.path.join(basepath, fname),
						app, start, basepath, app_path, fname)
					pages[page_info.route] = page_info
					# print frappe.as_json(pages[-1])

	return pages

def get_page_info(path, app, start, basepath=None, app_path=None, fname=None):
	'''Load page info'''
	if fname is None:
		fname = os.path.basename(path)

	if app_path is None:
		app_path = frappe.get_app_path(app)

	if basepath is None:
		basepath = os.path.dirname(path)

	page_name, extn = os.path.splitext(fname)

	# add website route
	page_info = frappe._dict()

	page_info.basename = page_name if extn in ('html', 'md') else fname
	page_info.basepath = basepath
	page_info.page_or_generator = "Page"

	page_info.template = os.path.relpath(os.path.join(basepath, fname), app_path)

	if page_info.basename == 'index':
		page_info.basename = ""

	# get route from template name
	page_info.route = page_info.template.replace(start, '').strip('/')
	if os.path.basename(page_info.route) in ('index.html', 'index.md'):
		page_info.route = os.path.dirname(page_info.route)

	# remove the extension
	if page_info.route.endswith('.md') or page_info.route.endswith('.html'):
		page_info.route = page_info.route.rsplit('.', 1)[0]

	page_info.name = page_info.page_name = page_info.route
	# controller
	page_info.controller_path = os.path.join(basepath, page_name.replace("-", "_") + ".py")

	if os.path.exists(page_info.controller_path):
		controller = app + "." + os.path.relpath(page_info.controller_path,
			app_path).replace(os.path.sep, ".")[:-3]

		page_info.controller = controller

	# get the source
	setup_source(page_info)

	if not page_info.title:
		page_info.title = extract_title(page_info.source, page_info.route)

	# extract properties from controller attributes
	load_properties_from_controller(page_info)

	return page_info

def get_frontmatter(string):
	"""
	Reference: https://github.com/jonbeebe/frontmatter
	"""
	import yaml

	fmatter = ""
	body = ""
	result = re.compile(r'^\s*(?:---|\+\+\+)(.*?)(?:---|\+\+\+)\s*(.+)$', re.S | re.M).search(string)

	if result:
		fmatter = result.group(1)
		body = result.group(2)

	return {
		"attributes": yaml.safe_load(fmatter),
		"body": body,
	}

def setup_source(page_info):
	'''Get the HTML source of the template'''
	jenv = frappe.get_jenv()
	source = jenv.loader.get_source(jenv, page_info.template)[0]
	html = ''

	if page_info.template.endswith(('.md', '.html')):
		# extract frontmatter block if exists
		try:
			# values will be used to update page_info
			res = get_frontmatter(source)
			if res['attributes']:
				page_info.update(res['attributes'])
				source = res['body']
		except Exception:
			pass

		if page_info.template.endswith('.md'):
			source = frappe.utils.md_to_html(source)
			page_info.page_toc_html = source.toc_html

			if not page_info.show_sidebar:
				source = '<div class="from-markdown">' + source + '</div>'

	if not page_info.base_template:
		page_info.base_template = get_base_template(page_info.route)

	if 	page_info.template.endswith(('.html', '.md', )) and \
		'{%- extends' not in source and '{% extends' not in source:
		# set the source only if it contains raw content
		html = source

	# load css/js files
	js_path = os.path.join(page_info.basepath, (page_info.basename or 'index') + '.js')
	if os.path.exists(js_path) and '{% block script %}' not in html:
		with io.open(js_path, 'r', encoding = 'utf-8') as f:
			js = f.read()
			page_info.colocated_js = js

	css_path = os.path.join(page_info.basepath, (page_info.basename or 'index') + '.css')
	if os.path.exists(css_path) and '{% block style %}' not in html:
		with io.open(css_path, 'r', encoding='utf-8') as f:
			css = f.read()
			page_info.colocated_css = css

	if html:
		page_info.source = html
		page_info.base_template =  page_info.base_template or 'templates/web.html'
	else:
		page_info.source = ''

	# show table of contents
	setup_index(page_info)

def get_base_template(path=None):
	'''
	Returns the `base_template` for given `path`.
	The default `base_template` for any web route is `templates/web.html` defined in `hooks.py`.
	This can be overridden for certain routes in `custom_app/hooks.py` based on regex pattern.
	'''
	if not path:
		path = frappe.local.request.path

	base_template_map = frappe.get_hooks("base_template_map") or {}
	patterns = list(base_template_map.keys())
	patterns_desc = sorted(patterns, key=lambda x: len(x), reverse=True)
	for pattern in patterns_desc:
		if re.match(pattern, path):
			templates = base_template_map[pattern]
			base_template = templates[-1]
			return base_template

def setup_index(page_info):
	'''Build page sequence from index.txt'''
	if page_info.basename=='':
		# load index.txt if loading all pages
		index_txt_path = os.path.join(page_info.basepath, 'index.txt')
		if os.path.exists(index_txt_path):
			with open(index_txt_path, 'r') as f:
				page_info.index = f.read().splitlines()

def load_properties_from_controller(page_info):
	if not page_info.controller: return

	module = frappe.get_module(page_info.controller)
	if not module: return

	for prop in ("base_template_path", "template", "no_cache",
		"sitemap", "condition_field"):
		if hasattr(module, prop):
			page_info[prop] = getattr(module, prop)

def get_doctypes_with_web_view():
	'''Return doctypes with Has Web View or set via hooks'''
	def _get():
		installed_apps = frappe.get_installed_apps()
		doctypes = frappe.get_hooks("website_generators")
		doctypes_with_web_view = frappe.get_all('DocType', fields=['name', 'module'],
			filters=dict(has_web_view=1))
		module_app_map = frappe.local.module_app
		doctypes += [d.name for d in doctypes_with_web_view if module_app_map.get(frappe.scrub(d.module)) in installed_apps]
		return doctypes

	return frappe.cache().get_value('doctypes_with_web_view', _get)

def get_start_folders():
	return frappe.local.flags.web_pages_folders or ('www', 'templates/pages')