####################################################################
#                                                                  #
# THIS FILE IS PART OF THE pycollada LIBRARY SOURCE CODE.          #
# USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     #
# GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE #
# IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       #
#                                                                  #
# THE pycollada SOURCE CODE IS (C) COPYRIGHT 2011                  #
# by Jeff Terrace and contributors                                 #
#                                                                  #
####################################################################

"""Module for managing data sources defined in geometry tags."""

import numpy

from collada.common import DaeObject, E, tag
from collada.common import DaeIncompleteError, DaeMalformedError, DaeUnsupportedError


class InputList(object):
    """Used for defining input sources to a geometry."""

    class Input:
        def __init__(self, offset, semantic, src, set=None):
            self.offset = offset
            self.semantic = semantic
            self.source = src
            self.set = set

    semantics = ["VERTEX", "NORMAL", "TEXCOORD", "TEXBINORMAL", "TEXTANGENT", "COLOR", "TANGENT", "BINORMAL"]

    def __init__(self):
        """Create an input list"""
        self.inputs = {}
        for s in self.semantics:
            self.inputs[s] = []

    def addInput(self, offset, semantic, src, set=None):
        """Add an input source to this input list.

        :param int offset:
          Offset for this source within the geometry's indices
        :param str semantic:
          The semantic for the input source. Currently supported options are:
            * VERTEX
            * NORMAL
            * TEXCOORD
            * TEXBINORMAL
            * TEXTANGENT
            * COLOR
            * TANGENT
            * BINORMAL
        :param str src:
          A string identifier of the form `#srcid` where `srcid` is a source
          within the geometry's :attr:`~collada.geometry.Geometry.sourceById` array.
        :param str set:
          Indicates a set number for the source. This is used, for example,
          when there are multiple texture coordinate sets.

        """
        if semantic not in self.semantics:
            raise DaeUnsupportedError("Unsupported semantic %s" % semantic)
        self.inputs[semantic].append(self.Input(offset, semantic, src, set))

    def getList(self):
        """Returns a list of tuples of the source in the form (offset, semantic, source, set)"""
        retlist = []
        for inplist in self.inputs.values():
            for inp in inplist:
                retlist.append((inp.offset, inp.semantic, inp.source, inp.set))
        return retlist

    def __str__(self):
        return '<InputList>'

    def __repr__(self):
        return str(self)


class Source(DaeObject):
    """Abstract class for loading source arrays"""

    @staticmethod
    def load(collada, localscope, node):
        sourceid = node.get('id')
        arraynode = node.find(collada.tag('float_array'))
        if arraynode is not None:
            return FloatSource.load(collada, localscope, node)

        arraynode = node.find(collada.tag('IDREF_array'))
        if arraynode is not None:
            return IDRefSource.load(collada, localscope, node)

        arraynode = node.find(collada.tag('Name_array'))
        if arraynode is not None:
            return NameSource.load(collada, localscope, node)

        if arraynode is None:
            raise DaeIncompleteError('No array found in source %s' % sourceid)


class FloatSource(Source):
    """Contains a source array of floats, as defined in the collada
    <float_array> inside a <source>.

    If ``f`` is an instance of :class:`collada.source.FloatSource`, then
    ``len(f)`` is the length of the shaped source. ``len(f)*len(f.components)``
    would give you the number of values in the source. ``f[i]`` is the i\\ :sup:`th`
    item in the source array.
    """

    def __init__(self, id, data, components, xmlnode=None):
        """Create a float source instance.

        :param str id:
          A unique string identifier for the source
        :param numpy.array data:
          Numpy array (unshaped) with the source values
        :param tuple components:
          Tuple of strings describing the semantic of the data,
          e.g. ``('X','Y','Z')`` would cause :attr:`data` to be
          reshaped as ``(-1, 3)``
        :param xmlnode:
          When loaded, the xmlnode it comes from.

        """

        self.id = id
        """The unique string identifier for the source"""

        # check that the passed data is reshapable
        if (data.size % len(components)) != 0:
            raise DaeMalformedError(
                'data.size `{}` isn\'t reshapable into `(-1, {})`!'.format(
                    data.size,
                    len(components)))

        """Numpy array with the source values. This will be shaped as ``(-1,N)`` where ``N = len(self.components)``"""
        self.data = data.reshape((-1, len(components)))

        self.components = components
        """Tuple of strings describing the semantic of the data, e.g. ``('X','Y','Z')``"""
        if xmlnode is not None:
            self.xmlnode = xmlnode
            """ElementTree representation of the source."""
        else:
            self.data.shape = (-1,)
            txtdata = ' '.join(map(str, self.data.tolist()))
            rawlen = len(self.data)
            self.data.shape = (-1, len(self.components))
            acclen = len(self.data)
            stridelen = len(self.components)
            sourcename = "%s-array" % self.id

            self.xmlnode = E.source(
                E.float_array(txtdata, count=str(rawlen), id=sourcename),
                E.technique_common(
                    E.accessor(
                        *[E.param(type='float', name=c) for c in self.components], **{'count': str(acclen), 'stride': str(stridelen), 'source': "#%s" % sourcename})
                ), id=self.id)

    def __len__(self):
        return len(self.data)

    def __getitem__(self, i):
        return self.data[i]

    def save(self):
        """Saves the source back to :attr:`xmlnode`"""
        self.data.shape = (-1,)

        txtdata = ' '.join(map(lambda x: '%.7g' % x, self.data.tolist()))

        rawlen = len(self.data)
        self.data.shape = (-1, len(self.components))
        acclen = len(self.data)
        node = self.xmlnode.find(tag('float_array'))
        node.text = txtdata
        node.set('count', str(rawlen))
        node.set('id', self.id + '-array')
        node = self.xmlnode.find('%s/%s' % (tag('technique_common'), tag('accessor')))
        node.clear()
        node.set('count', str(acclen))
        node.set('source', '#' + self.id + '-array')
        node.set('stride', str(len(self.components)))
        for c in self.components:
            node.append(E.param(type='float', name=c))
        self.xmlnode.set('id', self.id)

    @staticmethod
    def load(collada, localscope, node):
        sourceid = node.get('id')
        arraynode = node.find(collada.tag('float_array'))
        if arraynode is None:
            raise DaeIncompleteError('No float_array in source node')
        if arraynode.text is None or arraynode.text.isspace():
            data = numpy.array([], dtype=numpy.float32)
        else:
            try:
                data = numpy.fromstring(arraynode.text, dtype=numpy.float32, sep=' ')
            except ValueError:
                raise DaeMalformedError('Corrupted float array')
        data[numpy.isnan(data)] = 0

        paramnodes = node.findall('%s/%s/%s' % (collada.tag('technique_common'), collada.tag('accessor'), collada.tag('param')))
        if not paramnodes:
            raise DaeIncompleteError('No accessor info in source node')
        components = [param.get('name') for param in paramnodes]
        if len(components) == 2 and components[0] == 'U' and components[1] == 'V':
            # U,V is used for "generic" arguments - convert to S,T
            components = ['S', 'T']
        if len(components) == 3 and components[0] == 'S' and components[1] == 'T' and components[2] == 'P':
            components = ['S', 'T']
            data.shape = (-1, 3)
            # remove 3d texcoord dimension because we don't support it
            data = numpy.delete(data, -1, 1)
            data.shape = (-1)
        return FloatSource(sourceid, data, tuple(components), xmlnode=node)

    def __str__(self):
        return '<FloatSource size=%d>' % (len(self),)

    def __repr__(self):
        return str(self)


class IDRefSource(Source):
    """Contains a source array of ID references, as defined in the collada
    <IDREF_array> inside a <source>.

    If ``r`` is an instance of :class:`collada.source.IDRefSource`, then
    ``len(r)`` is the length of the shaped source. ``len(r)*len(r.components)``
    would give you the number of values in the source. ``r[i]`` is the i\\ :sup:`th`
    item in the source array.

    """

    def __init__(self, id, data, components, xmlnode=None):
        """Create an id ref source instance.

        :param str id:
          A unique string identifier for the source
        :param numpy.array data:
          Numpy array (unshaped) with the source values
        :param tuple components:
          Tuple of strings describing the semantic of the data,
          e.g. ``('MORPH_TARGET')`` would cause :attr:`data` to be
          reshaped as ``(-1, 1)``
        :param xmlnode:
          When loaded, the xmlnode it comes from.

        """

        self.id = id
        """The unique string identifier for the source"""
        self.data = data
        """Numpy array with the source values. This will be shaped as ``(-1,N)`` where ``N = len(self.components)``"""
        self.data.shape = (-1, len(components))
        self.components = components
        """Tuple of strings describing the semantic of the data, e.g. ``('MORPH_TARGET')``"""
        if xmlnode is not None:
            self.xmlnode = xmlnode
            """ElementTree representation of the source."""
        else:
            self.data.shape = (-1,)
            txtdata = ' '.join(map(str, self.data.tolist()))
            rawlen = len(self.data)
            self.data.shape = (-1, len(self.components))
            acclen = len(self.data)
            stridelen = len(self.components)
            sourcename = "%s-array" % self.id

            self.xmlnode = E.source(
                E.IDREF_array(txtdata, count=str(rawlen), id=sourcename),
                E.technique_common(
                    E.accessor(
                        *[E.param(type='IDREF', name=c) for c in self.components], **{'count': str(acclen), 'stride': str(stridelen), 'source': sourcename})
                ), id=self.id)

    def __len__(self):
        return len(self.data)

    def __getitem__(self, i):
        return self.data[i][0] if len(self.data[i]) == 1 else self.data[i]

    def save(self):
        """Saves the source back to :attr:`xmlnode`"""
        self.data.shape = (-1,)
        txtdata = ' '.join(map(str, self.data.tolist()))
        rawlen = len(self.data)
        self.data.shape = (-1, len(self.components))
        acclen = len(self.data)

        node = self.xmlnode.find(tag('IDREF_array'))
        node.text = txtdata
        node.set('count', str(rawlen))
        node.set('id', self.id + '-array')
        node = self.xmlnode.find('%s/%s' % (tag('technique_common'), tag('accessor')))
        node.clear()
        node.set('count', str(acclen))
        node.set('source', '#' + self.id + '-array')
        node.set('stride', str(len(self.components)))
        for c in self.components:
            node.append(E.param(type='IDREF', name=c))
        self.xmlnode.set('id', self.id)

    @staticmethod
    def load(collada, localscope, node):
        sourceid = node.get('id')
        arraynode = node.find(tag('IDREF_array'))
        if arraynode is None:
            raise DaeIncompleteError('No IDREF_array in source node')
        if arraynode.text is None or arraynode.text.isspace():
            values = []
        else:
            try:
                values = [v for v in arraynode.text.split()]
            except ValueError:
                raise DaeMalformedError('Corrupted IDREF array')
        data = numpy.array(values, dtype=numpy.unicode_)
        paramnodes = node.findall('%s/%s/%s' % (collada.tag('technique_common'), collada.tag('accessor'), collada.tag('param')))
        if not paramnodes:
            raise DaeIncompleteError('No accessor info in source node')
        components = [param.get('name') for param in paramnodes]
        return IDRefSource(sourceid, data, tuple(components), xmlnode=node)

    def __str__(self):
        return '<IDRefSource size=%d>' % (len(self),)

    def __repr__(self):
        return str(self)


class NameSource(Source):
    """Contains a source array of strings, as defined in the collada
    <Name_array> inside a <source>.

    If ``n`` is an instance of :class:`collada.source.NameSource`, then
    ``len(n)`` is the length of the shaped source. ``len(n)*len(n.components)``
    would give you the number of values in the source. ``n[i]`` is the i\\ :sup:`th`
    item in the source array.

    """

    def __init__(self, id, data, components, xmlnode=None):
        """Create a name source instance.

        :param str id:
          A unique string identifier for the source
        :param numpy.array data:
          Numpy array (unshaped) with the source values
        :param tuple components:
          Tuple of strings describing the semantic of the data,
          e.g. ``('JOINT')`` would cause :attr:`data` to be
          reshaped as ``(-1, 1)``
        :param xmlnode:
          When loaded, the xmlnode it comes from.

        """

        self.id = id
        """The unique string identifier for the source"""
        self.data = data
        """Numpy array with the source values. This will be shaped as ``(-1,N)`` where ``N = len(self.components)``"""
        self.data.shape = (-1, len(components))
        self.components = components
        """Tuple of strings describing the semantic of the data, e.g. ``('JOINT')``"""
        if xmlnode is not None:
            self.xmlnode = xmlnode
            """ElementTree representation of the source."""
        else:
            self.data.shape = (-1,)
            txtdata = ' '.join(map(str, self.data.tolist()))
            rawlen = len(self.data)
            self.data.shape = (-1, len(self.components))
            acclen = len(self.data)
            stridelen = len(self.components)
            sourcename = "%s-array" % self.id

            self.xmlnode = E.source(
                E.Name_array(txtdata, count=str(rawlen), id=sourcename),
                E.technique_common(
                    E.accessor(
                        *[E.param(type='Name', name=c) for c in self.components], **{'count': str(acclen), 'stride': str(stridelen), 'source': sourcename})
                ), id=self.id)

    def __len__(self):
        return len(self.data)

    def __getitem__(self, i):
        return self.data[i][0] if len(self.data[i]) == 1 else self.data[i]

    def save(self):
        """Saves the source back to :attr:`xmlnode`"""
        self.data.shape = (-1,)
        txtdata = ' '.join(map(str, self.data.tolist()))
        rawlen = len(self.data)
        self.data.shape = (-1, len(self.components))
        acclen = len(self.data)

        node = self.xmlnode.find(tag('Name_array'))
        node.text = txtdata
        node.set('count', str(rawlen))
        node.set('id', self.id + '-array')
        node = self.xmlnode.find('%s/%s' % (tag('technique_common'), tag('accessor')))
        node.clear()
        node.set('count', str(acclen))
        node.set('source', '#' + self.id + '-array')
        node.set('stride', str(len(self.components)))
        for c in self.components:
            node.append(E.param(type='IDREF', name=c))
        self.xmlnode.set('id', self.id)

    @staticmethod
    def load(collada, localscope, node):
        sourceid = node.get('id')
        arraynode = node.find(tag('Name_array'))
        if arraynode is None:
            raise DaeIncompleteError('No Name_array in source node')
        if arraynode.text is None or arraynode.text.isspace():
            values = []
        else:
            try:
                values = [v for v in arraynode.text.split()]
            except ValueError:
                raise DaeMalformedError('Corrupted Name array')
        data = numpy.array(values, dtype=numpy.unicode_)
        paramnodes = node.findall('%s/%s/%s' % (tag('technique_common'), tag('accessor'), tag
                                                ('param')))
        if not paramnodes:
            raise DaeIncompleteError('No accessor info in source node')
        components = [param.get('name') for param in paramnodes]
        return NameSource(sourceid, data, tuple(components), xmlnode=node)

    def __str__(self):
        return '<NameSource size=%d>' % (len(self),)

    def __repr__(self):
        return str(self)
