# Support for the GeoRSS format
# Copyright 2010-2015 Kurt McKee <contactme@kurtmckee.org>
# Copyright 2002-2008 Mark Pilgrim
# All rights reserved.
#
# This file is a part of feedparser.
#
# Redistribution and use in source and binary forms, with or without modification,
# are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright notice,
#   this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright notice,
#   this list of conditions and the following disclaimer in the documentation
#   and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 'AS IS'
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.

from __future__ import absolute_import, unicode_literals

from ..util import FeedParserDict

class Namespace(object):
    supported_namespaces = {
        'http://www.w3.org/2003/01/geo/wgs84_pos#': 'geo',
        'http://www.georss.org/georss': 'georss',
        'http://www.opengis.net/gml': 'gml',
    }

    def __init__(self):
        self.ingeometry = 0
        super(Namespace, self).__init__()

    def _start_georssgeom(self, attrsD):
        self.push('geometry', 0)
        context = self._getContext()
        context['where'] = FeedParserDict()

    _start_georss_point = _start_georssgeom
    _start_georss_line = _start_georssgeom
    _start_georss_polygon = _start_georssgeom
    _start_georss_box = _start_georssgeom

    def _save_where(self, geometry):
        context = self._getContext()
        context['where'].update(geometry)

    def _end_georss_point(self):
        geometry = _parse_georss_point(self.pop('geometry'))
        if geometry:
            self._save_where(geometry)

    def _end_georss_line(self):
        geometry = _parse_georss_line(self.pop('geometry'))
        if geometry:
            self._save_where(geometry)

    def _end_georss_polygon(self):
        this = self.pop('geometry')
        geometry = _parse_georss_polygon(this)
        if geometry:
            self._save_where(geometry)

    def _end_georss_box(self):
        geometry = _parse_georss_box(self.pop('geometry'))
        if geometry:
            self._save_where(geometry)

    def _start_where(self, attrsD):
        self.push('where', 0)
        context = self._getContext()
        context['where'] = FeedParserDict()
    _start_georss_where = _start_where

    def _parse_srs_attrs(self, attrsD):
        srsName = attrsD.get('srsname')
        try:
            srsDimension = int(attrsD.get('srsdimension', '2'))
        except ValueError:
            srsDimension = 2
        context = self._getContext()
        context['where']['srsName'] = srsName
        context['where']['srsDimension'] = srsDimension

    def _start_gml_point(self, attrsD):
        self._parse_srs_attrs(attrsD)
        self.ingeometry = 1
        self.push('geometry', 0)

    def _start_gml_linestring(self, attrsD):
        self._parse_srs_attrs(attrsD)
        self.ingeometry = 'linestring'
        self.push('geometry', 0)

    def _start_gml_polygon(self, attrsD):
        self._parse_srs_attrs(attrsD)
        self.push('geometry', 0)

    def _start_gml_exterior(self, attrsD):
        self.push('geometry', 0)

    def _start_gml_linearring(self, attrsD):
        self.ingeometry = 'polygon'
        self.push('geometry', 0)

    def _start_gml_pos(self, attrsD):
        self.push('pos', 0)

    def _end_gml_pos(self):
        this = self.pop('pos')
        context = self._getContext()
        srsName = context['where'].get('srsName')
        srsDimension = context['where'].get('srsDimension', 2)
        swap = True
        if srsName and "EPSG" in srsName:
            epsg = int(srsName.split(":")[-1])
            swap = bool(epsg in _geogCS)
        geometry = _parse_georss_point(this, swap=swap, dims=srsDimension)
        if geometry:
            self._save_where(geometry)

    def _start_gml_poslist(self, attrsD):
        self.push('pos', 0)

    def _end_gml_poslist(self):
        this = self.pop('pos')
        context = self._getContext()
        srsName = context['where'].get('srsName')
        srsDimension = context['where'].get('srsDimension', 2)
        swap = True
        if srsName and "EPSG" in srsName:
            epsg = int(srsName.split(":")[-1])
            swap = bool(epsg in _geogCS)
        geometry = _parse_poslist(
            this, self.ingeometry, swap=swap, dims=srsDimension)
        if geometry:
            self._save_where(geometry)

    def _end_geom(self):
        self.ingeometry = 0
        self.pop('geometry')
    _end_gml_point = _end_geom
    _end_gml_linestring = _end_geom
    _end_gml_linearring = _end_geom
    _end_gml_exterior = _end_geom
    _end_gml_polygon = _end_geom

    def _end_where(self):
        self.pop('where')
    _end_georss_where = _end_where


# GeoRSS geometry parsers. Each return a dict with 'type' and 'coordinates'
# items, or None in the case of a parsing error.

def _parse_poslist(value, geom_type, swap=True, dims=2):
    if geom_type == 'linestring':
        return _parse_georss_line(value, swap, dims)
    elif geom_type == 'polygon':
        ring = _parse_georss_line(value, swap, dims)
        return {'type': 'Polygon', 'coordinates': (ring['coordinates'],)}
    else:
        return None

def _gen_georss_coords(value, swap=True, dims=2):
    # A generator of (lon, lat) pairs from a string of encoded GeoRSS
    # coordinates. Converts to floats and swaps order.
    latlons = (float(ll) for ll in value.replace(',', ' ').split())
    while True:
        t = [next(latlons), next(latlons)][::swap and -1 or 1]
        if dims == 3:
            t.append(next(latlons))
        yield tuple(t)

def _parse_georss_point(value, swap=True, dims=2):
    # A point contains a single latitude-longitude pair, separated by
    # whitespace. We'll also handle comma separators.
    try:
        coords = list(_gen_georss_coords(value, swap, dims))
        return {'type': 'Point', 'coordinates': coords[0]}
    except (IndexError, ValueError):
        return None

def _parse_georss_line(value, swap=True, dims=2):
    # A line contains a space separated list of latitude-longitude pairs in
    # WGS84 coordinate reference system, with each pair separated by
    # whitespace. There must be at least two pairs.
    try:
        coords = list(_gen_georss_coords(value, swap, dims))
        return {'type': 'LineString', 'coordinates': coords}
    except (IndexError, ValueError):
        return None

def _parse_georss_polygon(value, swap=True, dims=2):
    # A polygon contains a space separated list of latitude-longitude pairs,
    # with each pair separated by whitespace. There must be at least four
    # pairs, with the last being identical to the first (so a polygon has a
    # minimum of three actual points).
    try:
        ring = list(_gen_georss_coords(value, swap, dims))
    except (IndexError, ValueError):
        return None
    if len(ring) < 4:
        return None
    return {'type': 'Polygon', 'coordinates': (ring,)}

def _parse_georss_box(value, swap=True, dims=2):
    # A bounding box is a rectangular region, often used to define the extents
    # of a map or a rough area of interest. A box contains two space separate
    # latitude-longitude pairs, with each pair separated by whitespace. The
    # first pair is the lower corner, the second is the upper corner.
    try:
        coords = list(_gen_georss_coords(value, swap, dims))
        return {'type': 'Box', 'coordinates': tuple(coords)}
    except (IndexError, ValueError):
        return None

# The list of EPSG codes for geographic (latitude/longitude) coordinate
# systems to support decoding of GeoRSS GML profiles.
_geogCS = [
3819, 3821, 3824, 3889, 3906, 4001, 4002, 4003, 4004, 4005, 4006, 4007, 4008,
4009, 4010, 4011, 4012, 4013, 4014, 4015, 4016, 4018, 4019, 4020, 4021, 4022,
4023, 4024, 4025, 4027, 4028, 4029, 4030, 4031, 4032, 4033, 4034, 4035, 4036,
4041, 4042, 4043, 4044, 4045, 4046, 4047, 4052, 4053, 4054, 4055, 4075, 4081,
4120, 4121, 4122, 4123, 4124, 4125, 4126, 4127, 4128, 4129, 4130, 4131, 4132,
4133, 4134, 4135, 4136, 4137, 4138, 4139, 4140, 4141, 4142, 4143, 4144, 4145,
4146, 4147, 4148, 4149, 4150, 4151, 4152, 4153, 4154, 4155, 4156, 4157, 4158,
4159, 4160, 4161, 4162, 4163, 4164, 4165, 4166, 4167, 4168, 4169, 4170, 4171,
4172, 4173, 4174, 4175, 4176, 4178, 4179, 4180, 4181, 4182, 4183, 4184, 4185,
4188, 4189, 4190, 4191, 4192, 4193, 4194, 4195, 4196, 4197, 4198, 4199, 4200,
4201, 4202, 4203, 4204, 4205, 4206, 4207, 4208, 4209, 4210, 4211, 4212, 4213,
4214, 4215, 4216, 4218, 4219, 4220, 4221, 4222, 4223, 4224, 4225, 4226, 4227,
4228, 4229, 4230, 4231, 4232, 4233, 4234, 4235, 4236, 4237, 4238, 4239, 4240,
4241, 4242, 4243, 4244, 4245, 4246, 4247, 4248, 4249, 4250, 4251, 4252, 4253,
4254, 4255, 4256, 4257, 4258, 4259, 4260, 4261, 4262, 4263, 4264, 4265, 4266,
4267, 4268, 4269, 4270, 4271, 4272, 4273, 4274, 4275, 4276, 4277, 4278, 4279,
4280, 4281, 4282, 4283, 4284, 4285, 4286, 4287, 4288, 4289, 4291, 4292, 4293,
4294, 4295, 4296, 4297, 4298, 4299, 4300, 4301, 4302, 4303, 4304, 4306, 4307,
4308, 4309, 4310, 4311, 4312, 4313, 4314, 4315, 4316, 4317, 4318, 4319, 4322,
4324, 4326, 4463, 4470, 4475, 4483, 4490, 4555, 4558, 4600, 4601, 4602, 4603,
4604, 4605, 4606, 4607, 4608, 4609, 4610, 4611, 4612, 4613, 4614, 4615, 4616,
4617, 4618, 4619, 4620, 4621, 4622, 4623, 4624, 4625, 4626, 4627, 4628, 4629,
4630, 4631, 4632, 4633, 4634, 4635, 4636, 4637, 4638, 4639, 4640, 4641, 4642,
4643, 4644, 4645, 4646, 4657, 4658, 4659, 4660, 4661, 4662, 4663, 4664, 4665,
4666, 4667, 4668, 4669, 4670, 4671, 4672, 4673, 4674, 4675, 4676, 4677, 4678,
4679, 4680, 4681, 4682, 4683, 4684, 4685, 4686, 4687, 4688, 4689, 4690, 4691,
4692, 4693, 4694, 4695, 4696, 4697, 4698, 4699, 4700, 4701, 4702, 4703, 4704,
4705, 4706, 4707, 4708, 4709, 4710, 4711, 4712, 4713, 4714, 4715, 4716, 4717,
4718, 4719, 4720, 4721, 4722, 4723, 4724, 4725, 4726, 4727, 4728, 4729, 4730,
4731, 4732, 4733, 4734, 4735, 4736, 4737, 4738, 4739, 4740, 4741, 4742, 4743,
4744, 4745, 4746, 4747, 4748, 4749, 4750, 4751, 4752, 4753, 4754, 4755, 4756,
4757, 4758, 4759, 4760, 4761, 4762, 4763, 4764, 4765, 4801, 4802, 4803, 4804,
4805, 4806, 4807, 4808, 4809, 4810, 4811, 4813, 4814, 4815, 4816, 4817, 4818,
4819, 4820, 4821, 4823, 4824, 4901, 4902, 4903, 4904, 4979 ]
