import json
from typing import Any
from unittest.mock import patch

import pytest
from click.testing import CliRunner

import mlflow
from mlflow.cli.scorers import commands
from mlflow.exceptions import MlflowException
from mlflow.genai.scorers import get_all_scorers, list_scorers, scorer
from mlflow.utils.string_utils import _create_table


@pytest.fixture
def mock_databricks_environment():
    with (
        patch("mlflow.genai.scorers.base.is_databricks_uri", return_value=True),
    ):
        yield


@pytest.fixture
def runner():
    return CliRunner(catch_exceptions=False)


@pytest.fixture
def experiment():
    """Create a test experiment."""
    experiment_id = mlflow.create_experiment(
        f"test_scorers_cli_{mlflow.utils.time.get_current_time_millis()}"
    )
    yield experiment_id
    mlflow.delete_experiment(experiment_id)


@pytest.fixture
def correctness_scorer():
    """Create a correctness scorer."""

    @scorer
    def _correctness_scorer(outputs) -> bool:
        return len(outputs) > 0

    return _correctness_scorer


@pytest.fixture
def safety_scorer():
    """Create a safety scorer."""

    @scorer
    def _safety_scorer(outputs) -> bool:
        return len(outputs) > 0

    return _safety_scorer


@pytest.fixture
def relevance_scorer():
    """Create a relevance scorer."""

    @scorer
    def _relevance_scorer(outputs) -> bool:
        return len(outputs) > 0

    return _relevance_scorer


@pytest.fixture
def generic_scorer():
    """Create a generic test scorer."""

    @scorer
    def _generic_scorer(outputs) -> bool:
        return True

    return _generic_scorer


def test_commands_group_exists():
    assert commands.name == "scorers"
    assert commands.help is not None


def test_list_command_params():
    list_cmd = next((cmd for cmd in commands.commands.values() if cmd.name == "list"), None)
    assert list_cmd is not None
    param_names = {p.name for p in list_cmd.params}
    assert param_names == {"experiment_id", "builtin", "output"}


def test_list_scorers_table_output(
    runner: CliRunner,
    experiment: str,
    correctness_scorer: Any,
    safety_scorer: Any,
    relevance_scorer: Any,
    mock_databricks_environment: Any,
):
    correctness_scorer.register(experiment_id=experiment, name="Correctness")
    safety_scorer.register(experiment_id=experiment, name="Safety")
    relevance_scorer.register(experiment_id=experiment, name="RelevanceToQuery")

    result = runner.invoke(commands, ["list", "--experiment-id", experiment])

    assert result.exit_code == 0

    # Construct expected table output (scorers are returned in alphabetical order)
    # Note: click.echo() adds a trailing newline
    expected_table = (
        _create_table(
            [["Correctness", ""], ["RelevanceToQuery", ""], ["Safety", ""]],
            headers=["Scorer Name", "Description"],
        )
        + "\n"
    )
    assert result.output == expected_table


def test_list_scorers_json_output(
    runner: CliRunner,
    experiment: str,
    correctness_scorer: Any,
    safety_scorer: Any,
    relevance_scorer: Any,
    mock_databricks_environment: Any,
):
    correctness_scorer.register(experiment_id=experiment, name="Correctness")
    safety_scorer.register(experiment_id=experiment, name="Safety")
    relevance_scorer.register(experiment_id=experiment, name="RelevanceToQuery")

    result = runner.invoke(commands, ["list", "--experiment-id", experiment, "--output", "json"])

    assert result.exit_code == 0
    output_json = json.loads(result.output)
    expected_scorers = [
        {"name": "Correctness", "description": None},
        {"name": "RelevanceToQuery", "description": None},
        {"name": "Safety", "description": None},
    ]
    assert output_json["scorers"] == expected_scorers


@pytest.mark.parametrize(
    ("output_format", "expected_output"),
    [
        ("table", ""),
        ("json", {"scorers": []}),
    ],
)
def test_list_scorers_empty_experiment(
    runner: CliRunner, experiment: str, output_format: str, expected_output: Any
):
    args = ["list", "--experiment-id", experiment]
    if output_format == "json":
        args.extend(["--output", "json"])

    result = runner.invoke(commands, args)
    assert result.exit_code == 0

    if output_format == "json":
        output_json = json.loads(result.output)
        assert output_json == expected_output
    else:
        # Empty table produces minimal output
        assert result.output.strip() == expected_output


def test_list_scorers_with_experiment_id_env_var(
    runner: CliRunner, experiment: str, correctness_scorer: Any, mock_databricks_environment: Any
):
    correctness_scorer.register(experiment_id=experiment, name="Correctness")

    result = runner.invoke(commands, ["list"], env={"MLFLOW_EXPERIMENT_ID": experiment})

    assert result.exit_code == 0
    assert "Correctness" in result.output


def test_list_scorers_missing_experiment_id(runner: CliRunner):
    result = runner.invoke(commands, ["list"])

    assert result.exit_code != 0
    assert "experiment-id" in result.output.lower() or "experiment_id" in result.output.lower()


def test_list_scorers_invalid_output_format(runner: CliRunner, experiment: str):
    result = runner.invoke(commands, ["list", "--experiment-id", experiment, "--output", "invalid"])

    assert result.exit_code != 0
    assert "invalid" in result.output.lower() or "choice" in result.output.lower()


def test_list_scorers_special_characters_in_names(
    runner: CliRunner, experiment: str, generic_scorer: Any, mock_databricks_environment: Any
):
    generic_scorer.register(experiment_id=experiment, name="Scorer With Spaces")
    generic_scorer.register(experiment_id=experiment, name="Scorer.With.Dots")
    generic_scorer.register(experiment_id=experiment, name="Scorer-With-Dashes")
    generic_scorer.register(experiment_id=experiment, name="Scorer_With_Underscores")

    result = runner.invoke(commands, ["list", "--experiment-id", experiment])

    assert result.exit_code == 0
    assert "Scorer With Spaces" in result.output
    assert "Scorer.With.Dots" in result.output
    assert "Scorer-With-Dashes" in result.output
    assert "Scorer_With_Underscores" in result.output


@pytest.mark.parametrize(
    "output_format",
    ["table", "json"],
)
def test_list_scorers_single_scorer(
    runner: CliRunner,
    experiment: str,
    generic_scorer: Any,
    output_format: str,
    mock_databricks_environment: Any,
):
    generic_scorer.register(experiment_id=experiment, name="OnlyScorer")

    args = ["list", "--experiment-id", experiment]
    if output_format == "json":
        args.extend(["--output", "json"])

    result = runner.invoke(commands, args)
    assert result.exit_code == 0

    if output_format == "json":
        output_json = json.loads(result.output)
        assert output_json == {"scorers": [{"name": "OnlyScorer", "description": None}]}
    else:
        assert "OnlyScorer" in result.output


@pytest.mark.parametrize(
    "output_format",
    ["table", "json"],
)
def test_list_scorers_long_names(
    runner: CliRunner,
    experiment: str,
    generic_scorer: Any,
    output_format: str,
    mock_databricks_environment: Any,
):
    long_name = "VeryLongScorerNameThatShouldNotBeTruncatedEvenIfItIsReallyReallyLong"
    generic_scorer.register(experiment_id=experiment, name=long_name)

    args = ["list", "--experiment-id", experiment]
    if output_format == "json":
        args.extend(["--output", "json"])

    result = runner.invoke(commands, args)
    assert result.exit_code == 0

    if output_format == "json":
        output_json = json.loads(result.output)
        assert output_json == {"scorers": [{"name": long_name, "description": None}]}
    else:
        # Full name should be present
        assert long_name in result.output


def test_list_scorers_with_descriptions(runner: CliRunner, experiment: str):
    from mlflow.genai.judges import make_judge

    judge1 = make_judge(
        name="quality_judge",
        instructions="Evaluate {{ outputs }}",
        description="Evaluates response quality",
        feedback_value_type=str,
    )
    judge1.register(experiment_id=experiment)

    judge2 = make_judge(
        name="safety_judge",
        instructions="Check {{ outputs }}",
        description="Checks for safety issues",
        feedback_value_type=str,
    )
    judge2.register(experiment_id=experiment)

    judge3 = make_judge(
        name="no_desc_judge",
        instructions="Evaluate {{ outputs }}",
        feedback_value_type=str,
    )
    judge3.register(experiment_id=experiment)

    result_json = runner.invoke(
        commands, ["list", "--experiment-id", experiment, "--output", "json"]
    )
    assert result_json.exit_code == 0
    output_json = json.loads(result_json.output)

    assert len(output_json["scorers"]) == 3
    scorers_by_name = {s["name"]: s for s in output_json["scorers"]}

    assert scorers_by_name["no_desc_judge"]["description"] is None
    assert scorers_by_name["quality_judge"]["description"] == "Evaluates response quality"
    assert scorers_by_name["safety_judge"]["description"] == "Checks for safety issues"

    result_table = runner.invoke(commands, ["list", "--experiment-id", experiment])
    assert result_table.exit_code == 0
    assert "Evaluates response quality" in result_table.output
    assert "Checks for safety issues" in result_table.output


def test_create_judge_basic(runner: CliRunner, experiment: str):
    result = runner.invoke(
        commands,
        [
            "register-llm-judge",
            "--name",
            "test_judge",
            "--instructions",
            "Evaluate {{ outputs }}",
            "--experiment-id",
            experiment,
        ],
    )

    assert result.exit_code == 0
    assert "Successfully created and registered judge scorer 'test_judge'" in result.output
    assert experiment in result.output

    # Verify judge was registered
    scorers = list_scorers(experiment_id=experiment)
    scorer_names = [s.name for s in scorers]
    assert "test_judge" in scorer_names


def test_create_judge_with_model(runner: CliRunner, experiment: str):
    result = runner.invoke(
        commands,
        [
            "register-llm-judge",
            "--name",
            "custom_model_judge",
            "--instructions",
            "Check {{ inputs }} and {{ outputs }}",
            "--model",
            "openai:/gpt-4",
            "--experiment-id",
            experiment,
        ],
    )

    assert result.exit_code == 0
    assert "Successfully created and registered" in result.output

    # Verify judge was registered with correct model
    scorers = list_scorers(experiment_id=experiment)
    scorer_names = [s.name for s in scorers]
    assert "custom_model_judge" in scorer_names

    # Get the judge and verify it uses the specified model
    judge = next(s for s in scorers if s.name == "custom_model_judge")
    assert judge.model == "openai:/gpt-4"


def test_create_judge_short_options(runner: CliRunner, experiment: str):
    result = runner.invoke(
        commands,
        [
            "register-llm-judge",
            "-n",
            "short_options_judge",
            "-i",
            "Evaluate {{ outputs }}",
            "-x",
            experiment,
        ],
    )

    assert result.exit_code == 0
    assert "Successfully created and registered" in result.output

    # Verify judge was registered
    scorers = list_scorers(experiment_id=experiment)
    scorer_names = [s.name for s in scorers]
    assert "short_options_judge" in scorer_names


def test_create_judge_with_env_var(runner: CliRunner, experiment: str):
    result = runner.invoke(
        commands,
        [
            "register-llm-judge",
            "--name",
            "env_var_judge",
            "--instructions",
            "Check {{ outputs }}",
        ],
        env={"MLFLOW_EXPERIMENT_ID": experiment},
    )

    assert result.exit_code == 0
    assert "Successfully created and registered" in result.output

    # Verify judge was registered
    scorers = list_scorers(experiment_id=experiment)
    scorer_names = [s.name for s in scorers]
    assert "env_var_judge" in scorer_names


@pytest.mark.parametrize(
    ("args", "missing_param"),
    [
        (["--instructions", "test", "--experiment-id", "123"], "name"),
        (["--name", "test", "--experiment-id", "123"], "instructions"),
        (["--name", "test", "--instructions", "test"], "experiment-id"),
    ],
)
def test_create_judge_missing_required_params(
    runner: CliRunner, args: list[str], missing_param: str
):
    result = runner.invoke(commands, ["register-llm-judge"] + args)

    assert result.exit_code != 0
    # Click typically shows "Missing option" for required parameters
    assert "missing" in result.output.lower() or "required" in result.output.lower()


def test_create_judge_invalid_prompt(runner: CliRunner, experiment: str):
    # Should raise MlflowException because make_judge validates that instructions
    # contain at least one variable
    with pytest.raises(MlflowException, match="[Tt]emplate.*variable"):
        runner.invoke(
            commands,
            [
                "register-llm-judge",
                "--name",
                "invalid_judge",
                "--instructions",
                "This has no template variables",
                "--experiment-id",
                experiment,
            ],
        )


def test_create_judge_special_characters_in_name(runner: CliRunner, experiment: str):
    # Verify experiment has no judges initially
    scorers = list_scorers(experiment_id=experiment)
    assert len(scorers) == 0

    result = runner.invoke(
        commands,
        [
            "register-llm-judge",
            "--name",
            "judge-with_special.chars",
            "--instructions",
            "Evaluate {{ outputs }}",
            "--experiment-id",
            experiment,
        ],
    )

    assert result.exit_code == 0
    assert "Successfully created and registered" in result.output

    # Verify experiment has exactly one judge
    scorers = list_scorers(experiment_id=experiment)
    assert len(scorers) == 1
    assert scorers[0].name == "judge-with_special.chars"


def test_create_judge_duplicate_registration(runner: CliRunner, experiment: str):
    # Create a judge
    result1 = runner.invoke(
        commands,
        [
            "register-llm-judge",
            "--name",
            "duplicate_judge",
            "--instructions",
            "Evaluate {{ outputs }}",
            "--experiment-id",
            experiment,
        ],
    )
    assert result1.exit_code == 0

    scorers = list_scorers(experiment_id=experiment)
    assert len(scorers) == 1
    assert scorers[0].name == "duplicate_judge"

    # Register the same judge again with same name - should succeed (replaces the old one)
    result2 = runner.invoke(
        commands,
        [
            "register-llm-judge",
            "--name",
            "duplicate_judge",
            "--instructions",
            "Evaluate {{ outputs }}",
            "--experiment-id",
            experiment,
        ],
    )
    assert result2.exit_code == 0

    # Verify there is still only one judge (the new one replaced the old one)
    scorers = list_scorers(experiment_id=experiment)
    assert len(scorers) == 1
    assert scorers[0].name == "duplicate_judge"


def test_create_judge_with_description(runner: CliRunner, experiment: str):
    description = "Evaluates response quality and relevance"
    result = runner.invoke(
        commands,
        [
            "register-llm-judge",
            "--name",
            "judge_with_desc",
            "--instructions",
            "Evaluate {{ outputs }}",
            "--description",
            description,
            "--experiment-id",
            experiment,
        ],
    )

    assert result.exit_code == 0
    assert "Successfully created and registered" in result.output

    scorers = list_scorers(experiment_id=experiment)
    assert len(scorers) == 1
    judge = scorers[0]
    assert judge.name == "judge_with_desc"
    assert judge.description == description


def test_create_judge_with_description_short_flag(runner: CliRunner, experiment: str):
    description = "Checks for PII in outputs"
    result = runner.invoke(
        commands,
        [
            "register-llm-judge",
            "-n",
            "pii_judge",
            "-i",
            "Check {{ outputs }}",
            "-d",
            description,
            "-x",
            experiment,
        ],
    )

    assert result.exit_code == 0

    scorers = list_scorers(experiment_id=experiment)
    judge = next(s for s in scorers if s.name == "pii_judge")
    assert judge.description == description


@pytest.mark.parametrize("output_format", ["table", "json"])
def test_list_builtin_scorers_output_formats(runner, output_format):
    args = ["list", "--builtin"]
    if output_format == "json":
        args.extend(["--output", "json"])

    result = runner.invoke(commands, args)
    assert result.exit_code == 0

    if output_format == "json":
        data = json.loads(result.output)
        assert "scorers" in data
        assert isinstance(data["scorers"], list)
        assert len(data["scorers"]) > 0

        # Verify each scorer has required fields
        for scorer_item in data["scorers"]:
            assert "name" in scorer_item
            assert "description" in scorer_item

        # Verify some builtin scorer names appear
        scorer_names = [s["name"] for s in data["scorers"]]
        assert "correctness" in scorer_names
        assert "relevance_to_query" in scorer_names
        assert "completeness" in scorer_names
    else:
        # Verify table headers
        assert "Scorer Name" in result.output
        assert "Description" in result.output

        # Verify some builtin scorer names appear
        assert "correctness" in result.output
        assert "relevance_to_query" in result.output
        assert "completeness" in result.output


def test_list_builtin_scorers_short_flag(runner):
    result = runner.invoke(commands, ["list", "-b"])
    assert result.exit_code == 0
    assert "Scorer Name" in result.output


def test_list_builtin_scorers_shows_all_available_scorers(runner):
    result = runner.invoke(commands, ["list", "--builtin", "--output", "json"])
    assert result.exit_code == 0

    expected_scorers = get_all_scorers()
    expected_names = {scorer.name for scorer in expected_scorers}

    data = json.loads(result.output)
    actual_names = {s["name"] for s in data["scorers"]}

    assert actual_names == expected_names


def test_list_scorers_mutually_exclusive_flags(runner, experiment):
    result = runner.invoke(commands, ["list", "--builtin", "--experiment-id", experiment])
    assert result.exit_code != 0
    assert "Cannot specify both --builtin and --experiment-id" in result.output


def test_list_scorers_requires_one_flag(runner):
    result = runner.invoke(commands, ["list"])
    assert result.exit_code != 0
    assert "Must specify either --builtin or --experiment-id" in result.output


def test_list_scorers_env_var_still_works(runner, experiment, monkeypatch):
    monkeypatch.setenv("MLFLOW_EXPERIMENT_ID", experiment)
    result = runner.invoke(commands, ["list"])
    assert result.exit_code == 0


def test_create_judge_with_base_url(runner: CliRunner, experiment: str):
    result = runner.invoke(
        commands,
        [
            "register-llm-judge",
            "--name",
            "proxy_judge",
            "--instructions",
            "Evaluate {{ outputs }}",
            "--model",
            "openai:/gpt-4",
            "--base-url",
            "http://my-proxy:8080/v1",
            "--experiment-id",
            experiment,
        ],
    )

    assert result.exit_code == 0
    assert "Successfully created and registered" in result.output

    # base_url is not persisted, so the registered judge won't have it
    scorers = list_scorers(experiment_id=experiment)
    assert any(s.name == "proxy_judge" for s in scorers)


def test_create_judge_with_extra_headers(runner: CliRunner, experiment: str):
    result = runner.invoke(
        commands,
        [
            "register-llm-judge",
            "--name",
            "headers_judge",
            "--instructions",
            "Evaluate {{ outputs }}",
            "--model",
            "openai:/gpt-4",
            "--extra-headers",
            '{"X-Api-Key": "secret", "X-Org": "my-org"}',
            "--experiment-id",
            experiment,
        ],
    )

    assert result.exit_code == 0
    assert "Successfully created and registered" in result.output

    scorers = list_scorers(experiment_id=experiment)
    assert any(s.name == "headers_judge" for s in scorers)


def test_create_judge_with_base_url_and_extra_headers(runner: CliRunner, experiment: str):
    result = runner.invoke(
        commands,
        [
            "register-llm-judge",
            "--name",
            "full_judge",
            "--instructions",
            "Evaluate {{ outputs }}",
            "--model",
            "openai:/gpt-4",
            "--base-url",
            "http://proxy:9090",
            "--extra-headers",
            '{"Authorization": "Bearer token"}',
            "--experiment-id",
            experiment,
        ],
    )

    assert result.exit_code == 0
    assert "Successfully created and registered" in result.output


def test_create_judge_invalid_extra_headers_json(runner: CliRunner, experiment: str):
    result = runner.invoke(
        commands,
        [
            "register-llm-judge",
            "--name",
            "bad_json_judge",
            "--instructions",
            "Evaluate {{ outputs }}",
            "--extra-headers",
            "not valid json",
            "--experiment-id",
            experiment,
        ],
    )

    assert result.exit_code != 0
    assert "Invalid JSON" in result.output


def test_create_judge_extra_headers_not_dict(runner: CliRunner, experiment: str):
    result = runner.invoke(
        commands,
        [
            "register-llm-judge",
            "--name",
            "array_headers_judge",
            "--instructions",
            "Evaluate {{ outputs }}",
            "--extra-headers",
            '["not", "a", "dict"]',
            "--experiment-id",
            experiment,
        ],
    )

    assert result.exit_code != 0
    assert "Expected a JSON object" in result.output


def test_create_judge_extra_headers_non_string_values(runner: CliRunner, experiment: str):
    result = runner.invoke(
        commands,
        [
            "register-llm-judge",
            "--name",
            "non_string_headers_judge",
            "--instructions",
            "Evaluate {{ outputs }}",
            "--extra-headers",
            '{"Authorization": 123}',
            "--experiment-id",
            experiment,
        ],
    )

    assert result.exit_code != 0
    assert "must all be strings" in result.output