import asyncio
import io

import pytest
import asynctest

import mitmproxy.io
from mitmproxy import exceptions
from mitmproxy.addons import readfile
from mitmproxy.test import taddons
from mitmproxy.test import tflow


@pytest.fixture
def data():
    f = io.BytesIO()

    w = mitmproxy.io.FlowWriter(f)
    flows = [
        tflow.tflow(resp=True),
        tflow.tflow(err=True),
        tflow.ttcpflow(),
        tflow.ttcpflow(err=True)
    ]
    for flow in flows:
        w.add(flow)

    f.seek(0)
    return f


@pytest.fixture
def corrupt_data():
    f = data()
    f.seek(0, io.SEEK_END)
    f.write(b"qibble")
    f.seek(0)
    return f


class TestReadFile:
    def test_configure(self):
        rf = readfile.ReadFile()
        with taddons.context(rf) as tctx:
            tctx.configure(rf, readfile_filter="~q")
            with pytest.raises(Exception, match="Invalid readfile filter"):
                tctx.configure(rf, readfile_filter="~~")

    @pytest.mark.asyncio
    async def test_read(self, tmpdir, data, corrupt_data):
        rf = readfile.ReadFile()
        with taddons.context(rf) as tctx:
            assert not rf.reading()

            tf = tmpdir.join("tfile")

            with asynctest.patch('mitmproxy.master.Master.load_flow') as mck:
                tf.write(data.getvalue())
                tctx.configure(
                    rf,
                    rfile = str(tf),
                    readfile_filter = ".*"
                )
                assert not mck.awaited
                rf.running()
                await asyncio.sleep(0)
                assert mck.awaited

            tf.write(corrupt_data.getvalue())
            tctx.configure(rf, rfile=str(tf))
            rf.running()
            assert await tctx.master.await_log("corrupted")

    @pytest.mark.asyncio
    async def test_corrupt(self, corrupt_data):
        rf = readfile.ReadFile()
        with taddons.context(rf) as tctx:
            with pytest.raises(exceptions.FlowReadException):
                await rf.load_flows(io.BytesIO(b"qibble"))

            tctx.master.clear()
            with pytest.raises(exceptions.FlowReadException):
                await rf.load_flows(corrupt_data)
            assert await tctx.master.await_log("file corrupted")

    @pytest.mark.asyncio
    async def test_nonexistent_file(self):
        rf = readfile.ReadFile()
        with taddons.context(rf) as tctx:
            with pytest.raises(exceptions.FlowReadException):
                await rf.load_flows_from_path("nonexistent")
            assert await tctx.master.await_log("nonexistent")


class TestReadFileStdin:
    @asynctest.patch('sys.stdin')
    @pytest.mark.asyncio
    async def test_stdin(self, stdin, data, corrupt_data):
        rf = readfile.ReadFileStdin()
        with taddons.context(rf):
            with asynctest.patch('mitmproxy.master.Master.load_flow') as mck:
                stdin.buffer = data
                assert not mck.awaited
                await rf.load_flows(stdin.buffer)
                assert mck.awaited

                stdin.buffer = corrupt_data
                with pytest.raises(exceptions.FlowReadException):
                    await rf.load_flows(stdin.buffer)

    @pytest.mark.asyncio
    async def test_normal(self, tmpdir, data):
        rf = readfile.ReadFileStdin()
        with taddons.context(rf) as tctx:
            tf = tmpdir.join("tfile")
            with asynctest.patch('mitmproxy.master.Master.load_flow') as mck:
                tf.write(data.getvalue())
                tctx.configure(rf, rfile=str(tf))
                assert not mck.awaited
                rf.running()
                await asyncio.sleep(0)
                assert mck.awaited
