"""
ID3 metadata parser, supported versions: 1.O, 2.2, 2.3 and 2.4

Informations: http://www.id3.org/

Author: Victor Stinner
"""

from lib.hachoir_core.field import (FieldSet, MatchError, ParserError,
    Enum, UInt8, UInt24, UInt32,
    CString, String, RawBytes,
    Bit, Bits, NullBytes, NullBits)
from lib.hachoir_core.text_handler import textHandler
from lib.hachoir_core.tools import humanDuration
from lib.hachoir_core.endian import NETWORK_ENDIAN

class ID3v1(FieldSet):
    static_size = 128 * 8
    GENRE_NAME = {
          0: u"Blues",
          1: u"Classic Rock",
          2: u"Country",
          3: u"Dance",
          4: u"Disco",
          5: u"Funk",
          6: u"Grunge",
          7: u"Hip-Hop",
          8: u"Jazz",
          9: u"Metal",
         10: u"New Age",
         11: u"Oldies",
         12: u"Other",
         13: u"Pop",
         14: u"R&B",
         15: u"Rap",
         16: u"Reggae",
         17: u"Rock",
         18: u"Techno",
         19: u"Industrial",
         20: u"Alternative",
         21: u"Ska",
         22: u"Death Metal",
         23: u"Pranks",
         24: u"Soundtrack",
         25: u"Euro-Techno",
         26: u"Ambient",
         27: u"Trip-Hop",
         28: u"Vocal",
         29: u"Jazz+Funk",
         30: u"Fusion",
         31: u"Trance",
         32: u"Classical",
         33: u"Instrumental",
         34: u"Acid",
         35: u"House",
         36: u"Game",
         37: u"Sound Clip",
         38: u"Gospel",
         39: u"Noise",
         40: u"AlternRock",
         41: u"Bass",
         42: u"Soul",
         43: u"Punk",
         44: u"Space",
         45: u"Meditative",
         46: u"Instrumental Pop",
         47: u"Instrumental Rock",
         48: u"Ethnic",
         49: u"Gothic",
         50: u"Darkwave",
         51: u"Techno-Industrial",
         52: u"Electronic",
         53: u"Pop-Folk",
         54: u"Eurodance",
         55: u"Dream",
         56: u"Southern Rock",
         57: u"Comedy",
         58: u"Cult",
         59: u"Gangsta",
         60: u"Top 40",
         61: u"Christian Rap",
         62: u"Pop/Funk",
         63: u"Jungle",
         64: u"Native American",
         65: u"Cabaret",
         66: u"New Wave",
         67: u"Psychadelic",
         68: u"Rave",
         69: u"Showtunes",
         70: u"Trailer",
         71: u"Lo-Fi",
         72: u"Tribal",
         73: u"Acid Punk",
         74: u"Acid Jazz",
         75: u"Polka",
         76: u"Retro",
         77: u"Musical",
         78: u"Rock & Roll",
         79: u"Hard Rock",
         # Following are winamp extentions
         80: u"Folk",
         81: u"Folk-Rock",
         82: u"National Folk",
         83: u"Swing",
         84: u"Fast Fusion",
         85: u"Bebob",
         86: u"Latin",
         87: u"Revival",
         88: u"Celtic",
         89: u"Bluegrass",
         90: u"Avantgarde",
         91: u"Gothic Rock",
         92: u"Progressive Rock",
         93: u"Psychedelic Rock",
         94: u"Symphonic Rock",
         95: u"Slow Rock",
         96: u"Big Band",
         97: u"Chorus",
         98: u"Easy Listening",
         99: u"Acoustic",
        100: u"Humour",
        101: u"Speech",
        102: u"Chanson",
        103: u"Opera",
        104: u"Chamber Music",
        105: u"Sonata",
        106: u"Symphony",
        107: u"Booty Bass",
        108: u"Primus",
        109: u"Porn Groove",
        110: u"Satire",
        111: u"Slow Jam",
        112: u"Club",
        113: u"Tango",
        114: u"Samba",
        115: u"Folklore",
        116: u"Ballad",
        117: u"Power Ballad",
        118: u"Rhythmic Soul",
        119: u"Freestyle",
        120: u"Duet",
        121: u"Punk Rock",
        122: u"Drum Solo",
        123: u"A capella",
        124: u"Euro-House",
        125: u"Dance Hall",
        126: u"Goa",
        127: u"Drum & Bass",
        128: u"Club-House",
        129: u"Hardcore",
        130: u"Terror",
        131: u"Indie",
        132: u"Britpop",
        133: u"Negerpunk",
        134: u"Polsk Punk",
        135: u"Beat",
        136: u"Christian Gangsta Rap",
        137: u"Heavy Metal",
        138: u"Black Metal",
        139: u"Crossover",
        140: u"Contemporary Christian",
        141: u"Christian Rock ",
        142: u"Merengue",
        143: u"Salsa",
        144: u"Trash Metal",
        145: u"Anime",
        146: u"JPop",
        147: u"Synthpop"
    }

    def createFields(self):
        yield String(self, "signature", 3, "IDv1 signature (\"TAG\")", charset="ASCII")
        if self["signature"].value != "TAG":
            raise MatchError("Stream doesn't look like ID3v1 (wrong signature)!")
        # TODO: Charset of below strings?
        yield String(self, "song", 30, "Song title", strip=" \0", charset="ISO-8859-1")
        yield String(self, "author", 30, "Author", strip=" \0", charset="ISO-8859-1")
        yield String(self, "album", 30, "Album title", strip=" \0", charset="ISO-8859-1")
        yield String(self, "year", 4, "Year", strip=" \0", charset="ISO-8859-1")

        # TODO: Write better algorithm to guess ID3v1 version
        version = self.getVersion()
        if version in ("v1.1", "v1.1b"):
            if version == "v1.1b":
                # ID3 v1.1b
                yield String(self, "comment", 29, "Comment", strip=" \0", charset="ISO-8859-1")
                yield UInt8(self, "track_nb", "Track number")
            else:
                # ID3 v1.1
                yield String(self, "comment", 30, "Comment", strip=" \0", charset="ISO-8859-1")
            yield Enum(UInt8(self, "genre", "Genre"), self.GENRE_NAME)
        else:
            # ID3 v1.0
            yield String(self, "comment", 31, "Comment", strip=" \0", charset="ISO-8859-1")

    def getVersion(self):
        addr = self.absolute_address + 126*8
        bytes = self.stream.readBytes(addr, 2)

        # last byte (127) is not space?
        if bytes[1] != ' ':
            # byte 126 is nul?
            if bytes[0] == 0x00:
                return "v1.1"
            else:
                return "v1.1b"
        else:
            return "1.0"

    def createDescription(self):
        version = self.getVersion()
        return "ID3 %s: author=%s, song=%s" % (
            version, self["author"].value, self["song"].value)

def getCharset(field):
    try:
        key = field.value
        return ID3_StringCharset.charset_name[key]
    except KeyError:
        raise ParserError("ID3v2: Invalid charset (%s)." % key)

class ID3_String(FieldSet):
    STRIP = " \0"
    def createFields(self):
        yield String(self, "text", self._size/8, "Text", charset="ISO-8859-1", strip=self.STRIP)

class ID3_StringCharset(ID3_String):
    STRIP = " \0"
    charset_desc = {
        0: "ISO-8859-1",
        1: "UTF-16 with BOM",
        2: "UTF-16 (big endian)",
        3: "UTF-8"
    }
    charset_name = {
        0: "ISO-8859-1",
        1: "UTF-16",
        2: "UTF-16-BE",
        3: "UTF-8"
    }
    def createFields(self):
        yield Enum(UInt8(self, "charset"), self.charset_desc)
        size = (self.size - self.current_size)/8
        if not size:
            return
        charset = getCharset(self["charset"])
        yield String(self, "text", size, "Text", charset=charset, strip=self.STRIP)

class ID3_GEOB(ID3_StringCharset):
    def createFields(self):
        yield Enum(UInt8(self, "charset"), self.charset_desc)
        charset = getCharset(self["charset"])
        yield CString(self, "mime", "MIME type", charset=charset)
        yield CString(self, "filename", "File name", charset=charset)
        yield CString(self, "description", "Content description", charset=charset)
        size = (self.size - self.current_size) // 8
        if not size:
            return
        yield String(self, "text", size, "Text", charset=charset)

class ID3_Comment(ID3_StringCharset):
    def createFields(self):
        yield Enum(UInt8(self, "charset"), self.charset_desc)
        yield String(self, "lang", 3, "Language", charset="ASCII")
        charset = getCharset(self["charset"])
        yield CString(self, "title", "Title", charset=charset, strip=self.STRIP)
        size = (self.size - self.current_size) // 8
        if not size:
            return
        yield String(self, "text", size, "Text", charset=charset, strip=self.STRIP)

class ID3_StringTitle(ID3_StringCharset):
    def createFields(self):
        yield Enum(UInt8(self, "charset"), self.charset_desc)
        if self.current_size == self.size:
            return
        charset = getCharset(self["charset"])
        yield CString(self, "title", "Title", charset=charset, strip=self.STRIP)
        size = (self.size - self.current_size)/8
        if not size:
            return
        yield String(self, "text", size, "Text", charset=charset, strip=self.STRIP)

class ID3_Private(FieldSet):
    def createFields(self):
        size = self._size/8
        # TODO: Strings charset?
        if self.stream.readBytes(self.absolute_address, 9) == "PeakValue":
            yield String(self, "text", 9, "Text")
            size -= 9
        yield String(self, "content", size, "Content")

class ID3_TrackLength(FieldSet):
    def createFields(self):
        yield NullBytes(self, "zero", 1)
        yield textHandler(String(self, "length", self._size/8 - 1,
            "Length in ms", charset="ASCII"), self.computeLength)

    def computeLength(self, field):
        try:
            ms = int(field.value)
            return humanDuration(ms)
        except:
            return field.value

class ID3_Picture23(FieldSet):
    pict_type_name = {
        0x00: "Other",
        0x01: "32x32 pixels 'file icon' (PNG only)",
        0x02: "Other file icon",
        0x03: "Cover (front)",
        0x04: "Cover (back)",
        0x05: "Leaflet page",
        0x06: "Media (e.g. lable side of CD)",
        0x07: "Lead artist/lead performer/soloist",
        0x08: "Artist/performer",
        0x09: "Conductor",
        0x0A: "Band/Orchestra",
        0x0B: "Composer",
        0x0C: "Lyricist/text writer",
        0x0D: "Recording Location",
        0x0E: "During recording",
        0x0F: "During performance",
        0x10: "Movie/video screen capture",
        0x11: "A bright coloured fish",
        0x12: "Illustration",
        0x13: "Band/artist logotype",
        0x14: "Publisher/Studio logotype"
    }
    def createFields(self):
        yield Enum(UInt8(self, "charset"), ID3_StringCharset.charset_desc)
        charset = getCharset(self["charset"])
        yield String(self, "img_fmt", 3, charset="ASCII")
        yield Enum(UInt8(self, "pict_type"), self.pict_type_name)
        yield CString(self, "text", "Text", charset=charset, strip=" \0")
        size = (self._size - self._current_size) / 8
        if size:
            yield RawBytes(self, "img_data", size)

class ID3_Picture24(FieldSet):
    def createFields(self):
        yield Enum(UInt8(self, "charset"), ID3_StringCharset.charset_desc)
        charset = getCharset(self["charset"])
        yield CString(self, "mime", "MIME type", charset=charset)
        yield Enum(UInt8(self, "pict_type"), ID3_Picture23.pict_type_name)
        yield CString(self, "description", charset=charset)
        size = (self._size - self._current_size) / 8
        if size:
            yield RawBytes(self, "img_data", size)

class ID3_Chunk(FieldSet):
    endian = NETWORK_ENDIAN
    tag22_name = {
        "TT2": "Track title",
        "TP1": "Artist",
        "TRK": "Track number",
        "COM": "Comment",
        "TCM": "Composer",
        "TAL": "Album",
        "TYE": "Year",
        "TEN": "Encoder",
        "TCO": "Content type",
        "PIC": "Picture"
    }
    tag23_name = {
        "COMM": "Comment",
        "GEOB": "Encapsulated object",
        "PRIV": "Private",
        "TPE1": "Artist",
        "TCOP": "Copyright",
        "TALB": "Album",
        "TENC": "Encoder",
        "TYER": "Year",
        "TSSE": "Encoder settings",
        "TCOM": "Composer",
        "TRCK": "Track number",
        "PCNT": "Play counter",
        "TCON": "Content type",
        "TLEN": "Track length",
        "TIT2": "Track title",
        "WXXX": "User defined URL"
    }
    handler = {
        "COMM": ID3_Comment,
        "COM": ID3_Comment,
        "GEOB": ID3_GEOB,
        "PIC": ID3_Picture23,
        "APIC": ID3_Picture24,
        "PRIV": ID3_Private,
        "TXXX": ID3_StringTitle,
        "WOAR": ID3_String,
        "WXXX": ID3_StringTitle,
    }

    def __init__(self, *args):
        FieldSet.__init__(self, *args)
        if 3 <= self["../ver_major"].value:
            self._size = (10 + self["size"].value) * 8
        else:
            self._size = (self["size"].value + 6) * 8

    def createFields(self):
        if 3 <= self["../ver_major"].value:
            # ID3 v2.3 and 2.4
            yield Enum(String(self, "tag", 4, "Tag", charset="ASCII", strip="\0"), ID3_Chunk.tag23_name)
            if 4 <= self["../ver_major"].value:
                yield ID3_Size(self, "size")   # ID3 v2.4
            else:
                yield UInt32(self, "size")   # ID3 v2.3

            yield Bit(self, "tag_alter", "Tag alter preservation")
            yield Bit(self, "file_alter", "Tag alter preservation")
            yield Bit(self, "rd_only", "Read only?")
            yield NullBits(self, "padding[]", 5)

            yield Bit(self, "compressed", "Frame is compressed?")
            yield Bit(self, "encrypted", "Frame is encrypted?")
            yield Bit(self, "group", "Grouping identity")
            yield NullBits(self, "padding[]", 5)
            size = self["size"].value
            is_compressed = self["compressed"].value
        else:
            # ID3 v2.2
            yield Enum(String(self, "tag", 3, "Tag", charset="ASCII", strip="\0"), ID3_Chunk.tag22_name)
            yield UInt24(self, "size")
            size = self["size"].value - self.current_size/8 + 6
            is_compressed = False

        if size:
            cls = None
            if not(is_compressed):
                tag = self["tag"].value
                if tag in ID3_Chunk.handler:
                    cls = ID3_Chunk.handler[tag]
                elif tag[0] == "T":
                    cls = ID3_StringCharset
            if cls:
                yield cls(self, "content", "Content", size=size*8)
            else:
                yield RawBytes(self, "content", size, "Raw data content")

    def createDescription(self):
        if self["size"].value != 0:
            return "ID3 Chunk: %s" % self["tag"].display
        else:
            return "ID3 Chunk: (terminator)"

class ID3_Size(Bits):
    static_size = 32

    def __init__(self, parent, name, description=None):
        Bits.__init__(self, parent, name, 32, description)

    def createValue(self):
        data = self.parent.stream.readBytes(self.absolute_address, 4)
        # TODO: Check that bit #7 of each byte is nul: not(ord(data[i]) & 127)
        return reduce(lambda x, y: x*128 + y, (ord(item) for item in data ))

class ID3v2(FieldSet):
    endian = NETWORK_ENDIAN
    VALID_MAJOR_VERSIONS = (2, 3, 4)

    def __init__(self, parent, name, size=None):
        FieldSet.__init__(self, parent, name, size=size)
        if not self._size:
            self._size = (self["size"].value + 10) * 8

    def createDescription(self):
        return "ID3 v2.%s.%s" % \
            (self["ver_major"].value, self["ver_minor"].value)

    def createFields(self):
        # Signature + version
        yield String(self, "header", 3, "Header (ID3)", charset="ASCII")
        yield UInt8(self, "ver_major", "Version (major)")
        yield UInt8(self, "ver_minor", "Version (minor)")

        # Check format
        if self["header"].value != "ID3":
            raise MatchError("Signature error, should be \"ID3\".")
        if self["ver_major"].value not in self.VALID_MAJOR_VERSIONS \
        or self["ver_minor"].value != 0:
            raise MatchError(
                "Unknown ID3 metadata version (2.%u.%u)"
                % (self["ver_major"].value, self["ver_minor"].value))

        # Flags
        yield Bit(self, "unsync", "Unsynchronisation is used?")
        yield Bit(self, "ext", "Extended header is used?")
        yield Bit(self, "exp", "Experimental indicator")
        yield NullBits(self, "padding[]", 5)

        # Size
        yield ID3_Size(self, "size")

        # All tags
        while self.current_size < self._size:
            field = ID3_Chunk(self, "field[]")
            yield field
            if field["size"].value == 0:
                break

        # Search first byte of the MPEG file
        padding = self.seekBit(self._size)
        if padding:
            yield padding