from hachoir_metadata.metadata import RootMetadata, registerExtractor
from hachoir_metadata.safe import fault_tolerant
from hachoir_parser.container import SwfFile
from hachoir_parser.misc import TorrentFile, TrueTypeFontFile, OLE2_File, PcfFile
from hachoir_core.field import isString
from hachoir_core.error import warning
from hachoir_parser import guessParser
from hachoir_metadata.setter import normalizeString

class TorrentMetadata(RootMetadata):
    KEY_TO_ATTR = {
        u"announce": "url",
        u"comment": "comment",
        u"creation_date": "creation_date",
    }
    INFO_TO_ATTR = {
        u"length": "file_size",
        u"name": "filename",
    }

    def extract(self, torrent):
        for field in torrent[0]:
            self.processRoot(field)

    @fault_tolerant
    def processRoot(self, field):
        if field.name in self.KEY_TO_ATTR:
            key = self.KEY_TO_ATTR[field.name]
            value = field.value
            setattr(self, key, value)
        elif field.name == "info" and "value" in field:
            for field in field["value"]:
                self.processInfo(field)

    @fault_tolerant
    def processInfo(self, field):
        if field.name in self.INFO_TO_ATTR:
            key = self.INFO_TO_ATTR[field.name]
            value = field.value
            setattr(self, key, value)
        elif field.name == "piece_length":
            self.comment = "Piece length: %s" % field.display

class TTF_Metadata(RootMetadata):
    NAMEID_TO_ATTR = {
        0: "copyright",   # Copyright notice
        3: "title",       # Unique font identifier
        5: "version",     # Version string
        8: "author",      # Manufacturer name
        11: "url",        # URL Vendor
        14: "copyright",  # License info URL
    }

    def extract(self, ttf):
        if "header" in ttf:
            self.extractHeader(ttf["header"])
        if "names" in ttf:
            self.extractNames(ttf["names"])

    @fault_tolerant
    def extractHeader(self, header):
        self.creation_date = header["created"].value
        self.last_modification = header["modified"].value
        self.comment = u"Smallest readable size in pixels: %s pixels" % header["lowest"].value
        self.comment = u"Font direction: %s" % header["font_dir"].display

    @fault_tolerant
    def extractNames(self, names):
        offset = names["offset"].value
        for header in names.array("header"):
            key = header["nameID"].value
            foffset = offset + header["offset"].value
            field = names.getFieldByAddress(foffset*8)
            if not field or not isString(field):
                continue
            value = field.value
            if key not in self.NAMEID_TO_ATTR:
                continue
            key = self.NAMEID_TO_ATTR[key]
            if key == "version" and value.startswith(u"Version "):
                # "Version 1.2" => "1.2"
                value = value[8:]
            setattr(self, key, value)

class OLE2_Metadata(RootMetadata):
    SUMMARY_ID_TO_ATTR = {
         2: "title",     # Title
         3: "title",     # Subject
         4: "author",
         6: "comment",
         8: "author",    # Last saved by
        12: "creation_date",
        13: "last_modification",
        14: "nb_page",
        18: "producer",
    }
    IGNORE_SUMMARY = set((
        1, # Code page
    ))

    DOC_SUMMARY_ID_TO_ATTR = {
         3: "title",     # Subject
        14: "author",    # Manager
    }
    IGNORE_DOC_SUMMARY = set((
        1, # Code page
    ))

    def extract(self, ole2):
        self._extract(ole2)

    def _extract(self, fieldset):
        try:
            fieldset._feedAll()
        except StopIteration:
            pass
        if "root[0]" in fieldset:
            self._extract(self.getFragment(fieldset["root[0]"]))
        doc_summary = self.getField(fieldset, "doc_summary[0]")
        if doc_summary:
            self.useSummary(doc_summary, True)
        word_doc = self.getField(fieldset, "word_doc[0]")
        if word_doc:
            self.useWordDocument(word_doc)
        summary = self.getField(fieldset, "summary[0]")
        if summary:
            self.useSummary(summary, False)

    def getFragment(self, frag):
        stream = frag.getSubIStream()
        ministream = guessParser(stream)
        if not ministream:
            warning("Unable to create the OLE2 mini stream parser!")
            return frag
        return ministream

    def getField(self, fieldset, name):
        # _feedAll() is needed to make sure that we get all fragments
        # eg. summary[0], summary[1], ..., summary[n]
        try:
            fieldset._feedAll()
        except StopIteration:
            pass
        if name not in fieldset:
            return None
        field = fieldset[name]
        return self.getFragment(field)

    @fault_tolerant
    def useSummary(self, summary, is_doc_summary):
        if "os" in summary:
            self.os = summary["os"].display
        if "section[0]" not in summary:
            return
        summary = summary["section[0]"]
        for property in summary.array("property_index"):
            self.useProperty(summary, property, is_doc_summary)

    @fault_tolerant
    def useWordDocument(self, doc):
        self.comment = "Encrypted: %s" % doc["FIB/fEncrypted"].value

    @fault_tolerant
    def useProperty(self, summary, property, is_doc_summary):
        field = summary.getFieldByAddress(property["offset"].value*8)
        if not field \
        or "value" not in field:
            return
        field = field["value"]
        if not field.hasValue():
            return

        # Get value
        value = field.value
        if isinstance(value, (str, unicode)):
            value = normalizeString(value)
            if not value:
                return

        # Get property identifier
        prop_id = property["id"].value
        if is_doc_summary:
            id_to_attr = self.DOC_SUMMARY_ID_TO_ATTR
            ignore = self.IGNORE_DOC_SUMMARY
        else:
            id_to_attr = self.SUMMARY_ID_TO_ATTR
            ignore = self.IGNORE_SUMMARY
        if prop_id in ignore:
            return

        # Get Hachoir metadata key
        try:
            key = id_to_attr[prop_id]
            use_prefix = False
        except LookupError:
            key = "comment"
            use_prefix = True
        if use_prefix:
            prefix = property["id"].display
            if (prefix in ("TotalEditingTime", "LastPrinted")) \
            and (not field):
                # Ignore null time delta
                return
            value = "%s: %s" % (prefix, value)
        else:
            if (key == "last_modification") and (not field):
                # Ignore null timestamp
                return
        setattr(self, key, value)

class PcfMetadata(RootMetadata):
    PROP_TO_KEY = {
        'CHARSET_REGISTRY': 'charset',
        'COPYRIGHT': 'copyright',
        'WEIGHT_NAME': 'font_weight',
        'FOUNDRY': 'author',
        'FONT': 'title',
        '_XMBDFED_INFO': 'producer',
    }

    def extract(self, pcf):
        if "properties" in pcf:
            self.useProperties(pcf["properties"])

    def useProperties(self, properties):
        last = properties["total_str_length"]
        offset0 = last.address + last.size
        for index in properties.array("property"):
            # Search name and value
            value = properties.getFieldByAddress(offset0+index["value_offset"].value*8)
            if not value:
                continue
            value = value.value
            if not value:
                continue
            name = properties.getFieldByAddress(offset0+index["name_offset"].value*8)
            if not name:
                continue
            name = name.value
            if name not in self.PROP_TO_KEY:
                warning("Skip %s=%r" % (name, value))
                continue
            key = self.PROP_TO_KEY[name]
            setattr(self, key, value)

class SwfMetadata(RootMetadata):
    def extract(self, swf):
        self.height = swf["rect/ymax"].value # twips
        self.width = swf["rect/xmax"].value # twips
        self.format_version = "flash version %s" % swf["version"].value
        self.frame_rate = swf["frame_rate"].value
        self.comment = "Frame count: %s" % swf["frame_count"].value

registerExtractor(TorrentFile, TorrentMetadata)
registerExtractor(TrueTypeFontFile, TTF_Metadata)
registerExtractor(OLE2_File, OLE2_Metadata)
registerExtractor(PcfFile, PcfMetadata)
registerExtractor(SwfFile, SwfMetadata)

