"""
Test suite for S3 CloudStorage integration.

Tests verify file upload, cleanup, URL generation, and error handling.
"""

import asyncio
import importlib
import os
from types import SimpleNamespace

import pytest

import sglang.multimodal_gen.runtime.entrypoints.openai.storage as storage_mod
from sglang.multimodal_gen.runtime.entrypoints.openai.storage import CloudStorage


def _create_temp_file(tmp_path, name="test.png", content=b"\x89PNG\r\n\x1a\nfake"):
    """Create a temporary test file."""
    p = tmp_path / name
    p.write_bytes(content)
    return str(p)


# UNIT TESTS


def test_upload_file_success(tmp_path):
    """Test successful upload with correct URL generation."""
    file_path = _create_temp_file(tmp_path, "image.png")

    storage_mod.cloud_storage.enabled = True
    storage_mod.cloud_storage.bucket_name = "my-bucket"
    storage_mod.cloud_storage.endpoint_url = "https://s3.example.com"
    storage_mod.cloud_storage.region_name = None

    called = {}

    def fake_upload(local_path, bucket, key, ExtraArgs=None):
        called["local_path"] = local_path
        called["bucket"] = bucket
        called["key"] = key
        called["extra"] = ExtraArgs

    storage_mod.cloud_storage.client = SimpleNamespace(upload_file=fake_upload)

    url = asyncio.run(storage_mod.cloud_storage.upload_file(file_path, "image.png"))

    assert url == "https://s3.example.com/my-bucket/image.png"
    assert called["local_path"] == file_path
    assert called["bucket"] == "my-bucket"
    assert called["key"] == "image.png"
    assert called["extra"]["ContentType"] == "image/png"


def test_upload_and_cleanup(tmp_path):
    """Test that local file is deleted after successful upload."""
    file_path = _create_temp_file(tmp_path, "cleanup.png")

    storage_mod.cloud_storage.enabled = True
    storage_mod.cloud_storage.bucket_name = "my-bucket"
    storage_mod.cloud_storage.endpoint_url = "https://s3.example.com"
    storage_mod.cloud_storage.client = SimpleNamespace(
        upload_file=lambda *args, **kwargs: None
    )

    assert os.path.exists(file_path)

    url = asyncio.run(storage_mod.cloud_storage.upload_and_cleanup(file_path))

    assert url == "https://s3.example.com/my-bucket/cleanup.png"
    assert not os.path.exists(file_path)


def test_upload_failure_preserves_file(tmp_path):
    """Test that file is preserved when upload fails."""
    file_path = _create_temp_file(tmp_path, "preserve.png")

    storage_mod.cloud_storage.enabled = True
    storage_mod.cloud_storage.bucket_name = "my-bucket"
    storage_mod.cloud_storage.endpoint_url = "https://s3.example.com"

    def fake_upload_raises(*args, **kwargs):
        raise RuntimeError("simulated failure")

    storage_mod.cloud_storage.client = SimpleNamespace(upload_file=fake_upload_raises)

    result = asyncio.run(storage_mod.cloud_storage.upload_and_cleanup(file_path))

    assert result is None
    assert os.path.exists(file_path)


def test_disabled_storage_returns_none(tmp_path):
    """Test that disabled storage returns None."""
    file_path = _create_temp_file(tmp_path, "test.png")

    prev_enabled = storage_mod.cloud_storage.enabled
    storage_mod.cloud_storage.enabled = False

    try:
        result = asyncio.run(
            storage_mod.cloud_storage.upload_file(file_path, "test.png")
        )
        assert result is None
    finally:
        storage_mod.cloud_storage.enabled = prev_enabled


def test_aws_url_with_region(tmp_path):
    """Test AWS S3 URL generation with specific region."""
    file_path = _create_temp_file(tmp_path, "aws.png")

    storage_mod.cloud_storage.enabled = True
    storage_mod.cloud_storage.bucket_name = "aws-bucket"
    storage_mod.cloud_storage.endpoint_url = None
    storage_mod.cloud_storage.region_name = "us-west-2"
    storage_mod.cloud_storage.client = SimpleNamespace(
        upload_file=lambda *args, **kwargs: None
    )

    url = asyncio.run(storage_mod.cloud_storage.upload_file(file_path, "aws.png"))

    assert url == "https://aws-bucket.s3.us-west-2.amazonaws.com/aws.png"


def test_aws_url_default_region(tmp_path):
    """Test AWS S3 URL defaults to us-east-1 when region not specified."""
    file_path = _create_temp_file(tmp_path, "default.png")

    storage_mod.cloud_storage.enabled = True
    storage_mod.cloud_storage.bucket_name = "default-bucket"
    storage_mod.cloud_storage.endpoint_url = None
    storage_mod.cloud_storage.region_name = None
    storage_mod.cloud_storage.client = SimpleNamespace(
        upload_file=lambda *args, **kwargs: None
    )

    url = asyncio.run(storage_mod.cloud_storage.upload_file(file_path, "default.png"))

    assert url == "https://default-bucket.s3.us-east-1.amazonaws.com/default.png"


def test_custom_endpoint_url(tmp_path):
    """Test URL generation with custom endpoint (MinIO/OSS/COS)."""
    file_path = _create_temp_file(tmp_path, "custom.png")

    storage_mod.cloud_storage.enabled = True
    storage_mod.cloud_storage.bucket_name = "custom-bucket"
    storage_mod.cloud_storage.endpoint_url = "https://minio.example.com/"
    storage_mod.cloud_storage.region_name = None
    storage_mod.cloud_storage.client = SimpleNamespace(
        upload_file=lambda *args, **kwargs: None
    )

    url = asyncio.run(storage_mod.cloud_storage.upload_file(file_path, "custom.png"))

    # Verify trailing slash is stripped
    assert url == "https://minio.example.com/custom-bucket/custom.png"


def test_content_type_detection(tmp_path):
    """Test Content-Type header for different file extensions."""
    storage_mod.cloud_storage.enabled = True
    storage_mod.cloud_storage.bucket_name = "test-bucket"
    storage_mod.cloud_storage.endpoint_url = "https://s3.test"

    test_cases = [
        ("image.png", "image/png"),
        ("image.jpg", "image/jpeg"),
        ("image.jpeg", "image/jpeg"),
        ("image.webp", "image/webp"),
        ("video.mp4", "video/mp4"),
        ("file.bin", "application/octet-stream"),
    ]

    for filename, expected_type in test_cases:
        called = {}

        def fake_upload(local_path, bucket, key, ExtraArgs=None):
            called["content_type"] = ExtraArgs.get("ContentType")

        storage_mod.cloud_storage.client = SimpleNamespace(upload_file=fake_upload)

        file_path = _create_temp_file(tmp_path, filename)
        asyncio.run(storage_mod.cloud_storage.upload_file(file_path, filename))

        assert called["content_type"] == expected_type


# requires moto and boto3
has_moto = (
    importlib.util.find_spec("moto") is not None
    and importlib.util.find_spec("boto3") is not None
)


@pytest.mark.skipif(not has_moto, reason="moto/boto3 not installed")
def test_integration_with_moto(tmp_path):
    """Integration test using moto to mock real S3 service."""
    import boto3
    from moto import mock_aws

    os.environ["SGLANG_CLOUD_STORAGE_TYPE"] = "s3"
    os.environ["SGLANG_S3_BUCKET_NAME"] = "integration-test"
    os.environ["SGLANG_S3_REGION_NAME"] = "us-east-1"

    with mock_aws():
        s3 = boto3.client("s3", region_name="us-east-1")
        s3.create_bucket(Bucket="integration-test")

        storage = CloudStorage()
        assert storage.is_enabled()

        file_path = _create_temp_file(tmp_path, "integration.png", b"test_data")

        url = asyncio.run(storage.upload_and_cleanup(file_path))

        assert url is not None
        assert "integration-test" in url
        assert "integration.png" in url
        assert not os.path.exists(file_path)

        obj = s3.get_object(Bucket="integration-test", Key="integration.png")
        assert obj["Body"].read() == b"test_data"

    for key in [
        "SGLANG_CLOUD_STORAGE_TYPE",
        "SGLANG_S3_BUCKET_NAME",
        "SGLANG_S3_REGION_NAME",
    ]:
        os.environ.pop(key, None)