#!/usr/bin/env python3

#
# bbb.py
#
# Utilities to parse BBB recording components
#
# Copyright (c) 2023 Sylvain Munaut <tnt@246tNt.com>
# SPDX-License-Identifier: MIT
#

__all__ = [
	'CursorEvent',
	'parse_cursor_xml',
	'PresentEvent',
	'SlideRef',
	'parse_deskshare_xml',
	'parse_shapes_svg',
	'PanZoomEvent',
	'parse_panzooms_xml',
]


import re
from collections import namedtuple

import lxml.etree


CursorEvent = namedtuple('CursorEvent', 'ts x y')

def parse_cursor_xml(filename):
	rv = []
	xml_doc = lxml.etree.parse(filename)
	for element in xml_doc.xpath("//recording/event"):
		px, py = [float(x) for x in element.getchildren()[0].text.split()]
		rv.append(CursorEvent(
			float(element.get("timestamp")),
			px,
			py,
		))
	return rv


PresentEvent = namedtuple('CursorEvent', 'ts_in ts_out slide')
SlideRef = namedtuple('SlideRef', 'deck_id page')

def parse_deskshare_xml(filename):
	rv = []
	xml_doc = lxml.etree.parse(filename)
	for element in xml_doc.xpath("//recording/event"):
		st = float(element.get("start_timestamp"))
		et = float(element.get("stop_timestamp"))
		rv.append( PresentEvent(st, et, None) )
	return rv


def parse_shapes_svg(filename):

	rv = []
	xml_doc = lxml.etree.parse(filename)
	ns = {
		'svg':   'http://www.w3.org/2000/svg',
		'xlink': 'http://www.w3.org/1999/xlink',
	}

	for element in xml_doc.xpath("//svg:svg/svg:image", namespaces=ns):
		# Parse/Validate href
		href = element.get('{http://www.w3.org/1999/xlink}href')

		if href == "presentation/deskshare.png":
			slide = None
		else:
			m = re.match('^presentation/([0-9a-fA-F]{40,64}-[0-9]+)/slide-([0-9]+).png$', href)
			if not m:
				raise RuntimeError('Invalid presentation page link')
			slide = SlideRef(m.group(1), int(m.group(2)))

		# Append
		rv.append(PresentEvent(
			float(element.get('in')),
			float(element.get('out')),
			slide
		))

	return rv


PanZoomEvent = namedtuple('PanZoomEvent', 'ts x y w h')

def parse_panzooms_xml(filename):
	rv = []
	xml_doc = lxml.etree.parse(filename)
	for element in xml_doc.xpath("//recording/event"):
		x, y, w, h = [float(x) for x in element.getchildren()[0].text.split()]
		rv.append(PanZoomEvent(
			float(element.get("timestamp")),
			x,
			y,
			w,
			h,
		))
	return rv