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#
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import contextlib
from uuid import uuid4

import pytest

from opendal.exceptions import ConditionNotMatch


@pytest.mark.asyncio
@pytest.mark.need_capability("read", "write", "delete", "read_with_if_match")
async def test_async_read_with_if_match(service_name, operator, async_operator):
    path = f"test_async_if_match_{uuid4()}.txt"
    content = b"test content"
    await async_operator.write(path, content)

    meta = await async_operator.stat(path)
    etag = meta.etag
    if etag is None:
        pytest.skip("backend does not return etag")

    # Matching etag should succeed
    assert await async_operator.read(path, if_match=etag) == content

    # Non-matching etag should fail
    with pytest.raises(ConditionNotMatch):
        await async_operator.read(path, if_match='"invalid-etag"')

    await async_operator.delete(path)


@pytest.mark.asyncio
@pytest.mark.need_capability("read", "write", "delete", "read_with_if_none_match")
async def test_async_read_with_if_none_match(service_name, operator, async_operator):
    path = f"test_async_if_none_match_{uuid4()}.txt"
    content = b"test content"
    await async_operator.write(path, content)

    meta = await async_operator.stat(path)
    etag = meta.etag
    if etag is None:
        pytest.skip("backend does not return etag")

    # Matching etag should fail (resource exists)
    with pytest.raises(ConditionNotMatch):
        await async_operator.read(path, if_none_match=etag)

    # Non-matching etag should succeed
    assert await async_operator.read(path, if_none_match='"invalid-etag"') == content

    await async_operator.delete(path)


@pytest.mark.asyncio
@pytest.mark.need_capability("write", "delete", "write_with_if_match")
async def test_async_write_with_if_match(service_name, operator, async_operator):
    path = f"test_async_write_if_match_{uuid4()}.txt"
    content = b"original content"
    await async_operator.write(path, content)

    meta = await async_operator.stat(path)
    etag = meta.etag
    if etag is None:
        pytest.skip("backend does not return etag")

    # Matching etag should allow overwrite
    new_content = b"updated content"
    await async_operator.write(path, new_content, if_match=etag)
    assert await async_operator.read(path) == new_content

    # Non-matching etag should fail
    with pytest.raises(ConditionNotMatch):
        await async_operator.write(path, b"should not write", if_match='"invalid-etag"')

    await async_operator.delete(path)


@pytest.mark.asyncio
@pytest.mark.need_capability("write", "delete", "write_with_if_none_match")
async def test_async_write_with_if_none_match(service_name, operator, async_operator):
    path = f"test_async_write_if_none_match_{uuid4()}.txt"
    content = b"test content"

    # File does not exist, so any if_none_match should succeed
    await async_operator.write(path, content, if_none_match='"*"')
    assert await async_operator.read(path) == content

    # File now exists — backends may either raise ConditionNotMatch or ignore
    # the header (e.g. Azurite). Verify the file is not overwritten if enforced.
    with contextlib.suppress(ConditionNotMatch):
        await async_operator.write(path, b"should not write", if_none_match='"*"')
    read_back = await async_operator.read(path)
    if read_back != content:
        pytest.skip("backend does not enforce if_none_match on existing files")


    await async_operator.delete(path)