#!/usr/bin/env python
# Eclipse SUMO, Simulation of Urban MObility; see https://eclipse.org/sumo
# Copyright (C) 2009-2019 German Aerospace Center (DLR) and others.
# This program and the accompanying materials
# are made available under the terms of the Eclipse Public License v2.0
# which accompanies this distribution, and is available at
# http://www.eclipse.org/legal/epl-v20.html
# SPDX-License-Identifier: EPL-2.0

# @file    generateTLSE3Detectors.py
# @author  Daniel Krajzewicz
# @author  Karol Stosiek
# @author  Michael Behrisch
# @date    2007-10-25
# @version $Id$

from __future__ import absolute_import
from __future__ import print_function

import logging
import optparse
import os
import sys

sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
import sumolib  # noqa


def getOptions():
    option_parser = optparse.OptionParser()
    option_parser.add_option("-n", "--net-file",
                             dest="net_file",
                             help="Network file to work with. Mandatory.",
                             type="string")
    option_parser.add_option("-j", "--junction-ids",
                             dest="junctionIDs",
                             help="List of junctions that shall receive detectors (comma separated)",
                             type="string")
    option_parser.add_option("-l", "--detector-length",
                             dest="requested_detector_length",
                             help="Length of the detector in meters "
                             "(-1 for maximal length).",
                             type="int",
                             default=250)
    option_parser.add_option("-d", "--distance-to-TLS",
                             dest="requested_distance_to_tls",
                             help="Distance of the detector to the traffic "
                             "light in meters. Defaults to 0.1m.",
                             type="float",
                             default=.1)
    option_parser.add_option("-f", "--frequency",
                             dest="frequency",
                             help="Detector's frequency. Defaults to 60.",
                             type="int",
                             default=60)
    option_parser.add_option("-o", "--output",
                             dest="output",
                             help="The name of the file to write the detector "
                             "definitions into. Defaults to e3.add.xml.",
                             type="string",
                             default="e3.add.xml")
    option_parser.add_option("--prefix",
                             dest="prefix",
                             help="Prefix for generated detectors",
                             type="string",
                             default="e3_")
    option_parser.add_option("-r", "--results-file",
                             dest="results",
                             help="The name of the file the detectors write "
                             "their output into. Defaults to e3output.xml.",
                             type="string",
                             default="e3output.xml")
    option_parser.add_option("--min-pos",
                             dest="minPos",
                             help="minimum position of entry detectors light in meters. Defaults to 0.1m.",
                             type="float",
                             default=.1)

    option_parser.add_option(
        "--interior", action="store_true",
        default=False, help="Extend measurement area to the junction interior")
    option_parser.add_option(
        "--joined", action="store_true",
        default=False, help="Create one e3Detector per junction")
    option_parser.add_option(
        "--follow-turnaround", dest="followTurnaround", action="store_true",
        default=False, help="Extend entry detectors past turn-around connections")
    option_parser.set_usage("generateTLSE3Detectors.py -n example.net.xml "
                            "-l 250 -d .1 -f 60")

    (options, args) = option_parser.parse_args()
    if not options.net_file:
        print("Missing arguments")
        option_parser.print_help()
        exit()
    return options


def writeEntryExit(options, edge, detector_xml, writeExit=True):
    stopOnTLS = True
    stopOnTurnaround = not options.followTurnaround
    input_edges = network.getDownstreamEdges(
        edge, options.requested_detector_length, stopOnTLS, stopOnTurnaround)
    input_edges.sort(key=lambda vals: vals[0].getID())
    for firstEdge, position, intermediate, aborted in input_edges:
        if aborted:
            position = .1
        position = max(position, min(options.minPos, firstEdge.getLength()))
        for lane in firstEdge.getLanes():
            detector_entry_xml = detector_xml.addChild("detEntry")
            detector_entry_xml.setAttribute("lane", lane.getID())
            detector_entry_xml.setAttribute("pos", "%.2f" % position)

    if writeExit:
        if options.interior:
            # exit just after leaving the intersection
            for e2 in sorted(edge.getOutgoing(), key=lambda e: e.getID()):
                for lane in e2.getLanes():
                    detector_exit_xml = detector_xml.addChild("detExit")
                    detector_exit_xml.setAttribute("lane", lane.getID())
                    detector_exit_xml.setAttribute("pos", "0")
        else:
            # exit just before entering the intersection
            for lane in edge.getLanes():
                detector_exit_xml = detector_xml.addChild("detExit")
                detector_exit_xml.setAttribute("lane", lane.getID())
                detector_exit_xml.setAttribute("pos", "-.1")


if __name__ == "__main__":
    # pylint: disable-msg=C0103
    options = getOptions()

    logging.basicConfig(level="INFO")

    logging.info("Reading net...")
    network = sumolib.net.readNet(options.net_file)

    logging.info("Generating detectors...")
    detectors_xml = sumolib.xml.create_document("additional")
    generated_detectors = 0

    tlsList, getEdges = network._tlss, sumolib.net.TLS.getEdges
    if options.junctionIDs:
        tlsList = [network.getNode(n) for n in options.junctionIDs.split(',')]
        getEdges = sumolib.net.node.Node.getIncoming

    for tls in tlsList:
        if options.joined:
            detector_xml = detectors_xml.addChild("e3Detector")
            detector_xml.setAttribute("id", options.prefix + str(tls.getID()))
            detector_xml.setAttribute("freq", str(options.frequency))
            detector_xml.setAttribute("file", options.results)
            generated_detectors += 1
            writeExit = True
            for edge in sorted(getEdges(tls), key=sumolib.net.edge.Edge.getID):
                writeEntryExit(options, edge, detector_xml, writeExit)
                writeExit = not options.interior

        else:
            for edge in sorted(getEdges(tls), key=sumolib.net.edge.Edge.getID):
                detector_xml = detectors_xml.addChild("e3Detector")
                detector_xml.setAttribute(
                    "id", options.prefix + str(tls.getID()) + "_" + str(edge.getID()))
                detector_xml.setAttribute("freq", str(options.frequency))
                detector_xml.setAttribute("file", options.results)
                if options.interior:
                    detector_xml.setAttribute("openEntry", "true")
                writeEntryExit(options, edge, detector_xml)
                generated_detectors += 1

    detector_file = open(options.output, 'w')
    detector_file.write(detectors_xml.toXML())
    detector_file.close()

    logging.info("%d e3 detectors generated!" % (generated_detectors))
