from fontTools.misc.textTools import safeEval
from . import DefaultTable
import struct
import array

# XXX I've lowered the strictness, to make sure Apple's own Chicago
# XXX gets through. They're looking into it, I hope to raise the standards
# XXX back to normal eventually.


class table_L_T_S_H_(DefaultTable.DefaultTable):
    def decompile(self, data, ttFont):
        version, numGlyphs = struct.unpack(">HH", data[:4])
        data = data[4:]
        assert version == 0, "unknown version: %s" % version
        assert (len(data) % numGlyphs) < 4, "numGlyphs doesn't match data length"
        # ouch: the assertion is not true in Chicago!
        # assert numGlyphs == ttFont['maxp'].numGlyphs
        yPels = array.array("B")
        yPels.frombytes(data)
        self.yPels = {}
        for i in range(numGlyphs):
            self.yPels[ttFont.getGlyphName(i)] = yPels[i]

    def compile(self, ttFont):
        version = 0
        names = list(self.yPels.keys())
        numGlyphs = len(names)
        yPels = [0] * numGlyphs
        # ouch: the assertion is not true in Chicago!
        # assert len(self.yPels) == ttFont['maxp'].numGlyphs == numGlyphs
        for name in names:
            yPels[ttFont.getGlyphID(name)] = self.yPels[name]
        yPels = array.array("B", yPels)
        return struct.pack(">HH", version, numGlyphs) + yPels.tobytes()

    def toXML(self, writer, ttFont):
        names = sorted(self.yPels.keys())
        for name in names:
            writer.simpletag("yPel", name=name, value=self.yPels[name])
            writer.newline()

    def fromXML(self, name, attrs, content, ttFont):
        if not hasattr(self, "yPels"):
            self.yPels = {}
        if name != "yPel":
            return  # ignore unknown tags
        self.yPels[attrs["name"]] = safeEval(attrs["value"])