from asyncio import StreamReader
from io import StringIO
from typing import IO, Dict
from unittest.mock import patch

import pytest

from benchmarks.codex.agent.agent import CodexAgent, DownloadStatus
from benchmarks.codex.agent.codex_client import CodexClient, Cid, Manifest
from benchmarks.codex.logging import CodexDownloadMetric
from benchmarks.core.concurrency import await_predicate_async
from benchmarks.core.utils.streams import BaseStreamReader
from benchmarks.logging.logging import LogParser


class FakeCodexClient(CodexClient):
    def __init__(self) -> None:
        self.storage: Dict[Cid, Manifest] = {}
        self.streams: Dict[Cid, StreamReader] = {}

    async def upload(self, name: str, mime_type: str, content: IO) -> Cid:
        data = content.read()
        cid = "Qm" + str(hash(data))
        self.storage[cid] = Manifest(
            cid=cid,
            datasetSize=len(data),
            mimetype=mime_type,
            blockSize=1,
            filename=name,
            treeCid="",
            uploadedAt=0,
            protected=False,
        )
        return cid

    async def get_manifest(self, cid: Cid) -> Manifest:
        return self.storage[cid]

    def create_download_stream(self, cid: Cid) -> StreamReader:
        reader = StreamReader()
        self.streams[cid] = reader
        return reader

    async def download(self, cid: Cid) -> BaseStreamReader:
        return self.streams[cid]


@pytest.mark.asyncio
async def test_should_create_dataset_of_right_size():
    codex_agent = CodexAgent(FakeCodexClient())
    cid = await codex_agent.create_dataset(size=1024, name="dataset-1", seed=1234)
    manifest = await codex_agent.client.get_manifest(cid)

    assert manifest.datasetSize == 1024


@pytest.mark.asyncio
async def test_same_seed_creates_same_cid():
    codex_agent = CodexAgent(FakeCodexClient())

    cid1 = await codex_agent.create_dataset(size=2048, name="dataset-1", seed=1234)
    cid2 = await codex_agent.create_dataset(size=2048, name="dataset-1", seed=1234)
    cid3 = await codex_agent.create_dataset(size=2048, name="dataset-1", seed=1235)

    assert cid1 == cid2
    assert cid1 != cid3


@pytest.mark.asyncio
async def test_should_report_download_progress():
    client = FakeCodexClient()
    codex_agent = CodexAgent(client)

    cid = await codex_agent.create_dataset(size=1000, name="dataset-1", seed=1234)
    download_stream = client.create_download_stream(cid)

    handle = await codex_agent.download(cid)

    assert handle.progress() == DownloadStatus(downloaded=0, total=1000)

    for i in range(200):
        download_stream.feed_data(b"0" * 5)
        assert await await_predicate_async(
            lambda: handle.progress()
            == DownloadStatus(downloaded=5 * (i + 1), total=1000),
            timeout=5,
        )

    download_stream.feed_eof()
    await handle.download_task

    assert handle.progress() == DownloadStatus(downloaded=1000, total=1000)


@pytest.mark.asyncio
async def test_should_raise_exception_on_progress_query_if_download_fails():
    client = FakeCodexClient()
    codex_agent = CodexAgent(client)

    cid = await codex_agent.create_dataset(size=1000, name="dataset-1", seed=1234)
    download_stream = client.create_download_stream(cid)

    handle = await codex_agent.download(cid)

    download_stream.feed_eof()

    with pytest.raises(EOFError):
        await handle.download_task


@pytest.mark.asyncio
async def test_should_log_download_progress_as_metric_in_discrete_steps(mock_logger):
    logger, output = mock_logger

    with patch("benchmarks.codex.agent.agent.logger", logger):
        client = FakeCodexClient()
        codex_agent = CodexAgent(client)

        cid = await codex_agent.create_dataset(size=1000, name="dataset-1", seed=1234)

        download_stream = client.create_download_stream(cid)
        download_stream.feed_data(b"0" * 1000)
        download_stream.feed_eof()

        handle = await codex_agent.download(cid, read_increment=0.2)
        await handle.download_task

    parser = LogParser()
    parser.register(CodexDownloadMetric)

    metrics = list(parser.parse(StringIO(output.getvalue())))

    assert metrics == [
        CodexDownloadMetric(
            cid=cid, value=200, node=codex_agent.node_id, timestamp=metrics[0].timestamp
        ),
        CodexDownloadMetric(
            cid=cid, value=400, node=codex_agent.node_id, timestamp=metrics[1].timestamp
        ),
        CodexDownloadMetric(
            cid=cid, value=600, node=codex_agent.node_id, timestamp=metrics[2].timestamp
        ),
        CodexDownloadMetric(
            cid=cid, value=800, node=codex_agent.node_id, timestamp=metrics[3].timestamp
        ),
        CodexDownloadMetric(
            cid=cid,
            value=1000,
            node=codex_agent.node_id,
            timestamp=metrics[4].timestamp,
        ),
    ]


@pytest.mark.asyncio
async def test_should_track_download_handles():
    client = FakeCodexClient()
    codex_agent = CodexAgent(client)

    cid = await codex_agent.create_dataset(size=1000, name="dataset-1", seed=1356)

    assert cid not in codex_agent.ongoing_downloads

    download_stream = client.create_download_stream(cid)
    handle = await codex_agent.download(cid)

    download_stream.feed_data(b"0" * 1000)
    download_stream.feed_eof()

    assert codex_agent.ongoing_downloads[cid] == handle

    await handle.download_task

    assert cid in codex_agent.ongoing_downloads