"""Create mopps using mopper.exe"""

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import os.path
import tempfile
import subprocess

def getMopperPath():
    """Get path to the mopper.

    >>> path = getMopperPath()
    >>> path.endswith("mopper.exe")
    True

    @raise OSError: If mopper.exe is not found.

    :return: Path to mopper.exe.
    :rtype: ``str``
    """
    mopper = os.path.join(os.path.dirname(__file__), "mopper.exe")
    if not os.path.exists(mopper):
        raise OSError("mopper.exe not found at %s" % mopper)
    return mopper

def getMopperCredits():
    """Get info about mopper, and credit havok.

    >>> print(getMopperCredits())
    Mopper. Copyright (c) 2008, NIF File Format Library and Tools.
    All rights reserved.
    <BLANKLINE>
    Options:
      --help      for usage help
      --license   for licensing details
    <BLANKLINE>
    Mopper uses havok. Copyright 1999-2008 Havok.com Inc. (and its Licensors).
    All Rights Reserved. See www.havok.com for details.
    <BLANKLINE>
    <BLANKLINE>

    @raise OSError: If mopper.exe is not found or cannot run.

    :return: Credits string.
    :rtype: ``str``
    """
    mopper = getMopperPath()
    outfile = tempfile.TemporaryFile("w+") # not binary
    try:
        # get license info, credit havok (raises OSError on failure)
        subprocess.call([mopper], stdout=outfile)
        outfile.seek(0)
        creditstr = outfile.read().replace("\r\n", "\n")
    finally:
        outfile.close()
    return creditstr

def getMopperOriginScaleCodeWelding(vertices, triangles, material_indices=None):
    """Generate mopp code and welding info for given geometry. Raises
    RuntimeError if something goes wrong (e.g. if mopp generator fails, or if
    mopper.exe cannot be run on the current platform).

    Call L{getMopperCredits} before calling this function if you need to credit
    havok in a console application that uses this function.

    For example, creating a mopp for the standard cube:

    >>> expected_moppcode = [
    ...     40, 0, 255, 39, 0, 255, 38, 0, 255, 19, 129, 125, 41, 22, 130,
    ...     125, 12, 24, 130, 125, 4, 38, 0, 5, 51, 39, 0, 5, 50, 24, 130,
    ...     125, 4, 40, 0, 5, 59, 16, 255, 249, 12, 20, 130, 125, 4, 39,
    ...     0, 5, 53, 40, 0, 5, 49, 54, 22, 130, 125, 25, 24, 130, 125, 17,
    ...     17, 255, 249, 12, 21, 129, 125, 4, 38, 0, 5, 57, 40, 249, 255,
    ...     58, 56, 40, 249, 255, 52, 24, 130, 125, 4, 39, 249, 255, 55, 38,
    ...     249, 255, 48]
    >>> orig, scale, moppcode, welding_info = getMopperOriginScaleCodeWelding(
    ...     [(1, 1, 1), (0, 0, 0), (0, 0, 1), (0, 1, 0),
    ...      (1, 0, 1), (0, 1, 1), (1, 1, 0), (1, 0, 0)],
    ...     [(0, 4, 6), (1, 6, 7), (2, 1, 4), (3, 1, 2),
    ...      (0, 2, 4), (4, 1, 7), (6, 4, 7), (3, 0, 6),
    ...      (0, 3, 5), (3, 2, 5), (2, 0, 5), (1, 3, 6)])
    >>> scale
    16319749.0
    >>> ["%6.3f" % value for value in orig]
    ['-0.010', '-0.010', '-0.010']
    >>> moppcode == expected_moppcode
    True
    >>> welding_info
    [23030, 23247, 23030, 16086, 23247, 23247, 23247, 23247, 23247, 23247, 23247, 16086]

    @raise RuntimeError: If the mopper has bad output.
    @raise OSError: If the mopper is not found or cannot run.

    :param vertices: List of vertices.
    :type vertices: list of tuples of floats
    :param triangles: List of triangles (indices referring back to vertex list).
    :type triangles: list of tuples of ints
    :param material_indices: List of material indices (optional).
    :type material_indices: list of ints
    :return: The origin as a tuple of floats, the mopp scale as a float,
        the mopp code as a list of ints, and the welding info as a list of
        ints.
    :rtype: ``tuple`` of ``float``\ s, ``float``, ``list`` of ``int``\ s, and ``list``
        of ``int``\ s
    """

    if material_indices is None:
        material_indices = []

    mopper = getMopperPath()
    infile = tempfile.TemporaryFile("w+") # not binary
    outfile = tempfile.TemporaryFile("w+") # not binary
    try:
        # set up input
        infile.write("%i\n" % len(vertices))
        for vert in vertices:
            infile.write("%f %f %f\n" % vert)
        infile.write("\n%i\n" % len(triangles))
        for tri in triangles:
            infile.write("%i %i %i\n" % tri)
        infile.write("\n%i\n" % len(material_indices))
        for matindex in material_indices:
            infile.write("%i\n" % matindex)
        infile.seek(0)
        # call mopper (raises OSError on failure)
        subprocess.call([mopper, "--"], stdin=infile, stdout=outfile)
        # process output
        outfile.seek(0)
        try:
            origin = tuple(float(outfile.readline()) for i in xrange(3))
            scale = float(outfile.readline())
            moppcodelen = int(outfile.readline())
            moppcode = [int(outfile.readline()) for i in xrange(moppcodelen)]
            welding_info_len = int(outfile.readline())
            welding_info = [int(outfile.readline())
                            for i in xrange(welding_info_len)]
        except ValueError:
            # conversion failed
            raise RuntimeError("invalid mopper output (mopper failed?)")
    finally:
        infile.close()
        outfile.close()
    return origin, scale, moppcode, welding_info

if __name__ == "__main__":
    import doctest
    doctest.testmod()

