from fontTools.misc import sstruct
from fontTools.misc.fixedTools import floatToFixedToStr
from fontTools.misc.textTools import safeEval
from . import DefaultTable
from . import grUtils
import struct

Sill_hdr = '''
    >
    version:    16.16F
'''

class table_S__i_l_l(DefaultTable.DefaultTable):

    def __init__(self, tag=None):
        DefaultTable.DefaultTable.__init__(self, tag)
        self.langs = {}

    def decompile(self, data, ttFont):
        (_, data) = sstruct.unpack2(Sill_hdr, data, self)
        self.version = float(floatToFixedToStr(self.version, precisionBits=16))
        numLangs, = struct.unpack('>H', data[:2])
        data = data[8:]
        maxsetting = 0
        langinfo = []
        for i in range(numLangs):
            (langcode, numsettings, offset) = struct.unpack(">4sHH",
                                                        data[i * 8:(i+1) * 8])
            offset = int(offset / 8) - (numLangs + 1)
            langcode = langcode.replace(b'\000', b'')
            langinfo.append((langcode.decode("utf-8"), numsettings, offset))
            maxsetting = max(maxsetting, offset + numsettings)
        data = data[numLangs * 8:]
        finfo = []
        for i in range(maxsetting):
            (fid, val, _) = struct.unpack(">LHH", data[i * 8:(i+1) * 8])
            finfo.append((fid, val))
        self.langs = {}
        for c, n, o in langinfo:
            self.langs[c] = []
            for i in range(o, o+n):
                self.langs[c].append(finfo[i])

    def compile(self, ttFont):
        ldat = b""
        fdat = b""
        offset = len(self.langs)
        for c, inf in sorted(self.langs.items()):
            ldat += struct.pack(">4sHH", c.encode('utf8'), len(inf), 8 * offset + 20)
            for fid, val in inf:
                fdat += struct.pack(">LHH", fid, val, 0)
            offset += len(inf)
        ldat += struct.pack(">LHH", 0x80808080, 0, 8 * offset + 20)
        return sstruct.pack(Sill_hdr, self) + grUtils.bininfo(len(self.langs)) + \
                ldat + fdat

    def toXML(self, writer, ttFont):
        writer.simpletag('version', version=self.version)
        writer.newline()
        for c, inf in sorted(self.langs.items()):
            writer.begintag('lang', name=c)
            writer.newline()
            for fid, val in inf:
                writer.simpletag('feature', fid=grUtils.num2tag(fid), val=val)
                writer.newline()
            writer.endtag('lang')
            writer.newline()

    def fromXML(self, name, attrs, content, ttFont):
        if name == 'version':
            self.version = float(safeEval(attrs['version']))
        elif name == 'lang':
            c = attrs['name']
            self.langs[c] = []
            for element in content:
                if not isinstance(element, tuple): continue
                tag, a, subcontent = element
                if tag == 'feature':
                    self.langs[c].append((grUtils.tag2num(a['fid']),
                                            int(safeEval(a['val']))))