import io

import os

import unittest

try:

    import hypothesis

    import hypothesis.strategies as strategies

except ImportError:

import zstandard as zstd

    make_cffi,

    NonClosingBytesIO,

    random_input_data,

)

@make_cffi

    @hypothesis.settings(

        cctx = zstd.ZstdCompressor(level=level)

        if streaming:

            source = io.BytesIO()

            writer = cctx.stream_writer(source)

            writer.write(original)

            writer.flush(zstd.FLUSH_FRAME)

            source.seek(0)

        else:

            frame = cctx.compress(original)

            source = io.BytesIO(frame)

        dctx = zstd.ZstdDecompressor()

        chunks = []

        with dctx.stream_reader(source, read_size=source_read_size) as reader:

            while True:

                read_size = read_sizes.draw(strategies.integers(-1, 131072))

                chunk = reader.read(read_size)

                if not chunk and read_size:

                    break

                chunks.append(chunk)

    # Similar to above except we have a constant read() size.

    @hypothesis.settings(

        if read_size == 0:

            read_size = 1

        cctx = zstd.ZstdCompressor(level=level)

        if streaming:

            source = io.BytesIO()

            writer = cctx.stream_writer(source)

            writer.write(original)

            writer.flush(zstd.FLUSH_FRAME)

            source.seek(0)

        else:

            frame = cctx.compress(original)

            source = io.BytesIO(frame)

        dctx = zstd.ZstdDecompressor()

        chunks = []

        reader = dctx.stream_reader(source, read_size=source_read_size)

        while True:

            chunk = reader.read(read_size)

            if not chunk and read_size:

                break

            chunks.append(chunk)

    @hypothesis.settings(

        cctx = zstd.ZstdCompressor(level=level)

        if streaming:

            source = io.BytesIO()

            writer = cctx.stream_writer(source)

            writer.write(original)

            writer.flush(zstd.FLUSH_FRAME)

            frame = source.getvalue()

        else:

            frame = cctx.compress(original)

        dctx = zstd.ZstdDecompressor()

        chunks = []

        with dctx.stream_reader(frame, read_size=source_read_size) as reader:

            while True:

                read_size = read_sizes.draw(strategies.integers(-1, 131072))

                chunk = reader.read(read_size)

                if not chunk and read_size:

                    break

                chunks.append(chunk)

    # Similar to above except we have a constant read() size.

    @hypothesis.settings(

        if read_size == 0:

            read_size = -1

        cctx = zstd.ZstdCompressor(level=level)

        if streaming:

            source = io.BytesIO()

            writer = cctx.stream_writer(source)

            writer.write(original)

            writer.flush(zstd.FLUSH_FRAME)

            frame = source.getvalue()

        else:

            frame = cctx.compress(original)

        dctx = zstd.ZstdDecompressor()

        chunks = []

        reader = dctx.stream_reader(frame, read_size=source_read_size)

        while True:

            chunk = reader.read(read_size)

            if not chunk and read_size:

                break

            chunks.append(chunk)

    @hypothesis.settings(

        cctx = zstd.ZstdCompressor(level=level)

        if streaming:

            source = io.BytesIO()

            writer = cctx.stream_writer(source)

            writer.write(original)

            writer.flush(zstd.FLUSH_FRAME)

            source.seek(0)

        else:

            frame = cctx.compress(original)

            source = io.BytesIO(frame)

        dctx = zstd.ZstdDecompressor()

        data = dctx.stream_reader(source, read_size=source_read_size).readall()

        self.assertEqual(data, original)

    @hypothesis.settings(

        cctx = zstd.ZstdCompressor(level=level)

        if streaming:

            source = io.BytesIO()

            writer = cctx.stream_writer(source)

            writer.write(original)

            writer.flush(zstd.FLUSH_FRAME)

            source.seek(0)

        else:

            frame = cctx.compress(original)

            source = io.BytesIO(frame)

        dctx = zstd.ZstdDecompressor()

        chunks = []

        with dctx.stream_reader(source, read_size=source_read_size) as reader:

            while True:

                read_size = read_sizes.draw(strategies.integers(-1, 131072))

                chunk = reader.read1(read_size)

                if not chunk and read_size:

                    break

                chunks.append(chunk)

    @hypothesis.settings(

        cctx = zstd.ZstdCompressor(level=level)

        if streaming:

            source = io.BytesIO()

            writer = cctx.stream_writer(source)

            writer.write(original)

            writer.flush(zstd.FLUSH_FRAME)

            source.seek(0)

        else:

            frame = cctx.compress(original)

            source = io.BytesIO(frame)

        dctx = zstd.ZstdDecompressor()

        chunks = []

        with dctx.stream_reader(source, read_size=source_read_size) as reader:

            while True:

                read_size = read_sizes.draw(strategies.integers(1, 131072))

                b = bytearray(read_size)

                count = reader.readinto1(b)

                if not count:

                    break

                chunks.append(bytes(b[0:count]))

    @hypothesis.settings(

    @hypothesis.given(

        original=strategies.sampled_from(random_input_data()),

        level=strategies.integers(min_value=1, max_value=5),

        source_read_size=strategies.integers(1, 1048576),

        seek_amounts=strategies.data(),

        cctx = zstd.ZstdCompressor(level=level)

        frame = cctx.compress(original)

        dctx = zstd.ZstdDecompressor()

        with dctx.stream_reader(frame, read_size=source_read_size) as reader:

            while True:

                amount = seek_amounts.draw(strategies.integers(0, 16384))

                reader.seek(amount, os.SEEK_CUR)

                offset = reader.tell()

                read_amount = read_sizes.draw(strategies.integers(1, 16384))

                chunk = reader.read(read_amount)

                if not chunk:

                    break

    @hypothesis.settings(

    @hypothesis.given(

        originals=strategies.data(),

        frame_count=strategies.integers(min_value=2, max_value=10),

        level=strategies.integers(min_value=1, max_value=5),

        source_read_size=strategies.integers(1, 1048576),

        cctx = zstd.ZstdCompressor(level=level)

        source = io.BytesIO()

        buffer = io.BytesIO()

        writer = cctx.stream_writer(buffer)

        for i in range(frame_count):

            data = originals.draw(strategies.sampled_from(random_input_data()))

            source.write(data)

            writer.write(data)

            writer.flush(zstd.FLUSH_FRAME)

        dctx = zstd.ZstdDecompressor()

        buffer.seek(0)

        chunks = []

        while True:

            read_amount = read_sizes.draw(strategies.integers(-1, 16384))

            chunk = reader.read(read_amount)

            if not chunk and read_amount:

                break

            chunks.append(chunk)

@make_cffi

    def test_write_size_variance(self, original, level, write_size, input_sizes):

        cctx = zstd.ZstdCompressor(level=level)

        frame = cctx.compress(original)

        dctx = zstd.ZstdDecompressor()

        source = io.BytesIO(frame)

        dest = NonClosingBytesIO()

        with dctx.stream_writer(dest, write_size=write_size) as decompressor:

            while True:

                input_size = input_sizes.draw(strategies.integers(1, 4096))

                chunk = source.read(input_size)

                if not chunk:

                    break

                decompressor.write(chunk)

        self.assertEqual(dest.getvalue(), original)

@make_cffi

    def test_read_write_size_variance(self, original, level, read_size, write_size):

        cctx = zstd.ZstdCompressor(level=level)

        frame = cctx.compress(original)

        source = io.BytesIO(frame)

        dest = io.BytesIO()

        dctx = zstd.ZstdDecompressor()

        dctx.copy_stream(source, dest, read_size=read_size, write_size=write_size)

        self.assertEqual(dest.getvalue(), original)

@make_cffi

    def test_random_input_sizes(self, original, level, chunk_sizes):

        cctx = zstd.ZstdCompressor(level=level)

        frame = cctx.compress(original)

        source = io.BytesIO(frame)

        dctx = zstd.ZstdDecompressor()

        dobj = dctx.decompressobj()

        chunks = []

        while True:

            chunk_size = chunk_sizes.draw(strategies.integers(1, 4096))

            chunk = source.read(chunk_size)

            if not chunk:

                break

            chunks.append(dobj.decompress(chunk))