# SPDX-FileCopyrightText: Copyright (c) 2025-2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
# SPDX-License-Identifier: Apache-2.0

"""Unit tests for SGLang backend components."""

import re
import sys
from pathlib import Path

import pytest

from dynamo.sglang.args import parse_args
from dynamo.sglang.tests.conftest import make_cli_args_fixture

# Get path relative to this test file
REPO_ROOT = Path(__file__).resolve().parents[5]
TEST_DIR = REPO_ROOT / "tests"
# Now construct the full path to the shared test fixture
JINJA_TEMPLATE_PATH = str(
    REPO_ROOT / "tests" / "serve" / "fixtures" / "custom_template.jinja"
)

pytestmark = [
    pytest.mark.unit,
    pytest.mark.sglang,
    pytest.mark.gpu_1,
    pytest.mark.pre_merge,
]
# Create SGLang-specific CLI args fixture
# This will use monkeypatch to write to argv
mock_sglang_cli = make_cli_args_fixture("dynamo.sglang")


@pytest.mark.asyncio
async def test_custom_jinja_template_invalid_path(mock_sglang_cli):
    """Test that invalid file path raises FileNotFoundError."""
    invalid_path = "/nonexistent/path/to/template.jinja"
    mock_sglang_cli(
        "--model", "Qwen/Qwen3-0.6B", "--custom-jinja-template", invalid_path
    )

    with pytest.raises(
        FileNotFoundError,
        match=re.escape(f"Custom Jinja template file not found: {invalid_path}"),
    ):
        await parse_args(sys.argv[1:])


@pytest.mark.asyncio
async def test_custom_jinja_template_valid_path(mock_sglang_cli):
    """Test that valid absolute path is stored correctly."""
    mock_sglang_cli(model="Qwen/Qwen3-0.6B", custom_jinja_template=JINJA_TEMPLATE_PATH)

    config = await parse_args(sys.argv[1:])

    assert config.dynamo_args.custom_jinja_template == JINJA_TEMPLATE_PATH, (
        f"Expected custom_jinja_template value to be {JINJA_TEMPLATE_PATH}, "
        f"got {config.dynamo_args.custom_jinja_template}"
    )


@pytest.mark.asyncio
async def test_custom_jinja_template_env_var_expansion(monkeypatch, mock_sglang_cli):
    """Test that environment variables in paths are expanded by Python code."""
    jinja_dir = str(TEST_DIR / "serve" / "fixtures")
    monkeypatch.setenv("JINJA_DIR", jinja_dir)

    cli_path = "$JINJA_DIR/custom_template.jinja"
    mock_sglang_cli(model="Qwen/Qwen3-0.6B", custom_jinja_template=cli_path)

    config = await parse_args(sys.argv[1:])

    assert "$JINJA_DIR" not in config.dynamo_args.custom_jinja_template
    assert config.dynamo_args.custom_jinja_template == JINJA_TEMPLATE_PATH, (
        f"Expected custom_jinja_template value to be {JINJA_TEMPLATE_PATH}, "
        f"got {config.dynamo_args.custom_jinja_template}"
    )


# --- Tool Call Parser Validation Tests ---


@pytest.mark.asyncio
async def test_tool_call_parser_valid_with_dynamo_tokenizer(mock_sglang_cli):
    """Valid parser name works when using Dynamo's tokenizer."""
    mock_sglang_cli(
        "--model",
        "Qwen/Qwen3-0.6B",
        "--dyn-tool-call-parser",
        "hermes",  # supported by Dynamo
    )

    config = await parse_args(sys.argv[1:])

    assert config.dynamo_args.tool_call_parser == "hermes"


@pytest.mark.asyncio
async def test_tool_call_parser_invalid_with_dynamo_tokenizer(mock_sglang_cli):
    """Invalid parser name exits when using Dynamo's tokenizer."""
    mock_sglang_cli(
        "--model", "Qwen/Qwen3-0.6B", "--dyn-tool-call-parser", "nonexistent_parser"
    )

    with pytest.raises(SystemExit):
        await parse_args(sys.argv[1:])


@pytest.mark.asyncio
async def test_tool_call_parser_both_flags_error(mock_sglang_cli):
    """Setting both --dyn-tool-call-parser and --tool-call-parser exits with error."""
    mock_sglang_cli(
        "--model",
        "Qwen/Qwen3-0.6B",
        "--dyn-tool-call-parser",
        "hermes",
        "--tool-call-parser",
        "qwen25",
    )

    with pytest.raises(SystemExit):
        await parse_args(sys.argv[1:])
