# Source code for canlib.kvlclib.converter

    import ctypes as ct
    import os

    from .. import deprecation
    from .properties import _PROPERTY_TYPE
    from .wrapper import dll

    class Converter(object):
        """A kvlclib converter

        This class wraps all kvlclib functions related to converters, and saves you
        from keeping track of a handle and passing that to the functions.

        `kvlcCreateConverter` and `kvlcDeleteConverter` are not wrapped as they are
        called when Converter objects are created and deleted,
        respectively. However, if it is necessary to force the converter to write
        its files, `flush` can be used to simulate destroying and recreating the
        converter object.

        Note:
            No more than 128 converters can be open at the same time.

        """

        def __init__(self, filename, file_format):
            self.format = file_format
            self.handle = ct.c_void_p(None)
            self.filename = os.path.realpath(filename)
            self.file_format = file_format
            dll.kvlcCreateConverter(
                ct.byref(self.handle), self.filename.encode(), file_format.id_)

        def __del__(self):
            """Delete the converter and close all files."""
            dll.kvlcDeleteConverter(self.handle)

        def addDatabaseFile(self, filename, channel_mask):
            """Add a database file.

            Converters with the property `canlib.kvlclib.Property.SIGNAL_BASED` will match
            events against all entries in the database and write signals to the
            output file.

            """
            filename = os.path.realpath(filename)
            ct_filename = ct.c_char_p(filename.encode('utf-8'))
            dll.kvlcAddDatabaseFile(self.handle, ct_filename, channel_mask)

        def attachFile(self, filename):
            """Attach file to be included in the output file.

            E.g. used to add a database or a movie to the output.

            Note that the output format must support the property
            `canlib.kvlclib.Property.ATTACHMENTS`.
            """
            filename = os.path.realpath(filename)
            ct_filename = ct.c_char_p(filename.encode('utf-8'))
            dll.kvlcAttachFile(self.handle, ct_filename)

        def convertEvent(self):
            """Convert next event.

            Convert one event from input file and write it to output file.
            """
            dll.kvlcConvertEvent(self.handle)

        def flush(self):
            """Recreate the converter so changes are saved to disk

            Converters do not write changes to disk until they are deleted. This
            method deletes and recreates the underlying C converter, without
            needing to recreate the Python object.

            """
            self.__del__()
            self.__init__(self.filename, self.file_format)

        def getProperty(self, wr_property):
            """Get current value for a writer property.

            Args:
                wr_property (`canlib.kvlclib.Property`): Writer property to be set
            """
            # Backward compatibility with deprecated kvlclib.PROPERTY_XXX
            if isinstance(wr_property, dict):
                buf = wr_property['type']
                wr_property = wr_property['value']
            else:
                buf = _PROPERTY_TYPE[wr_property]()
            dll.kvlcGetProperty(self.handle, wr_property, ct.byref(buf), ct.sizeof(buf))
            return buf.value

        def getOutputFilename(self):
            """Get the filename of the current output file."""
            filename = ct.create_string_buffer(256)
            dll.kvlcGetOutputFilename(
                self.handle, filename, ct.sizeof(filename))
            return filename.value.decode('utf-8')

        def nextInputFile(self, filename):
            """Select next input file."""
            filename = os.path.realpath(filename)
            ct_filename = ct.c_char_p(filename.encode('utf-8'))
            dll.kvlcNextInputFile(self.handle, ct_filename)

        def eventCount(self):
            """Get extimated number of events left.

            Get the estimated number of remaining events in the input file. This
            can be useful for displaying progress during conversion.
            """
            count = ct.c_uint(0)
            dll.kvlcEventCount(self.handle, ct.byref(count))
            return count.value

        def setProperty(self, wr_property, value):
            """Set a property value.

            Args:
                wr_property (`canlib.kvlclib.Property`): Writer property to be set
            """
            # Backward compatibility with deprecated kvlclib.PROPERTY_XXX
            if isinstance(wr_property, dict):
                buf = wr_property['type']
                wr_property = wr_property['value']
            else:
                buf = _PROPERTY_TYPE[wr_property]()
            buf.value = value
            dll.kvlcSetProperty(self.handle, wr_property, ct.byref(buf), ct.sizeof(buf))

        def isOutputFilenameNew(self):
            """Check if the converter has created a new file.

            This is only true once after a a new file has been created. Used when
            splitting output into multiple files.
            """
            updated = ct.c_int()
            dll.kvlcIsOutputFilenameNew(
                self.handle, ct.byref(updated))
            return updated.value

        @deprecation.deprecated.replacedby(isOutputFilenameNew)
        def IsOutputFilenameNew(self):
            pass

        def isOverrunActive(self):
            """Get overrun status.

            Overruns can occur during logging with a Memorator if the bus load
            exceeds the logging capacity. This is very unusual, but can occur if a
            Memorator runs complex scripts and triggers.
            """
            overrun = ct.c_int()
            dll.kvlcIsOverrunActive(self.handle, ct.byref(overrun))
            return overrun.value

        @deprecation.deprecated.replacedby(isOverrunActive)
        def IsOverrunActive(self):
            pass

        def resetOverrunActive(self):
            """Reset overrun status."""
            dll.kvlcResetOverrunActive(self.handle)

        def isDataTruncated(self):
            """Get truncation status.

            Truncation occurs when the selected output converter can't write all
            bytes in a data frame to file. This can happen if CAN FD data is
            extracted to a format that only supports up to 8 data bytes,
            e.g. `canlib.kvlclib.FileFormat.KME40`.

            Truncation can also happen if `kvlclib.Property.LIMIT_DATA_BYTES` is
            set to limit the number of data bytes in output.

            Returns True if data has been truncated

            """
            truncated = ct.c_int()
            dll.kvlcIsDataTruncated(self.handle, ct.byref(truncated))
            return truncated.value

        @deprecation.deprecated.replacedby(isDataTruncated)
        def IsDataTruncated(self):
            pass

        def resetStatusTruncated(self):
            """Reset data trunctation status."""
            dll.kvlcResetDataTruncated(self.handle)

        def setInputFile(self, filename, file_format):
            """Select input file.

            Args:
                filename (string): Name of input file
                file_format (`canlib.kvlclib.FileFormat`): A supported input format
            """
            filename = os.path.realpath(filename)
            ct_filename = ct.c_char_p(filename.encode('utf-8'))
            dll.kvlcSetInputFile(self.handle, ct_filename, file_format)

        @deprecation.deprecated.favour(".format.getPropertyDefault")
        def getPropertyDefault(self, wr_property):
            """Get default value for a writer property."""
            return self.format.getPropertyDefault(wr_property)

        @deprecation.deprecated.favour(".format.isPropertySupported")
        def isPropertySupported(self, wr_property):
            """Check if specified wr_property is supported by the current format.

            Retuns True if the property is supported by the current format.

            Args:
                wr_property (int): Any one of the defined PROPERTY_xxx
            """
            return self.format.isPropertySupported(wr_property)