# SPDX-License-Identifier: Apache-2.0
# SPDX-FileCopyrightText: Copyright The LanceDB Authors

import json
from pathlib import Path

import pytest

from lancedb import col
import lancedb.functions as functions
from lancedb.functions import (
    FunctionApplication,
    FunctionBinding,
    FunctionVersion,
    PythonRuntimeSpec,
    SecretBinding,
    RefreshColumnResult,
    SecretReference,
)
from lancedb.table import AsyncTable


FIXTURES = (
    Path(__file__).parents[3]
    / "rust"
    / "lancedb"
    / "tests"
    / "fixtures"
    / "first_class_functions"
    / "v1"
)


def fixture(name: str) -> str:
    return (FIXTURES / name).read_text()


def job_result(name: str) -> dict:
    return json.loads(fixture(name))["result"]


def assert_no_secret_values(value):
    """No client value models a resolved credential, at any nesting depth."""
    if isinstance(value, dict):
        for key, child in value.items():
            assert key not in {
                "secret_value",
                "secret_values",
                "resolved_secret",
                "resolved_secrets",
            }
            assert_no_secret_values(child)
    elif isinstance(value, list):
        for child in value:
            assert_no_secret_values(child)


def test_public_function_values_are_in_api_reference():
    docs = Path(__file__).parents[3] / "docs" / "src" / "python" / "python.md"
    rendered = docs.read_text()
    for name in functions.__all__:
        assert f"::: lancedb.functions.{name}" in rendered


@pytest.mark.parametrize(
    ("fixture_name", "canonical_name", "model", "nested_result"),
    [
        (
            "remote_function_job.json",
            "remote_function_version.canonical.json",
            FunctionVersion,
            True,
        ),
        (
            "remote_function_application.json",
            "remote_function_application.canonical.json",
            FunctionApplication,
            False,
        ),
        (
            "remote_function_binding.json",
            "remote_function_binding.canonical.json",
            FunctionBinding,
            False,
        ),
        (
            "remote_initialized_function_application.json",
            "remote_initialized_function_application.canonical.json",
            FunctionApplication,
            False,
        ),
        (
            "remote_initialized_function_binding.json",
            "remote_initialized_function_binding.canonical.json",
            FunctionBinding,
            False,
        ),
        (
            "remote_refresh_job.json",
            "remote_refresh_result.canonical.json",
            RefreshColumnResult,
            True,
        ),
        (
            "remote_refresh_result_without_published_version.json",
            "remote_refresh_result_without_published_version.canonical.json",
            RefreshColumnResult,
            False,
        ),
    ],
)
def test_python_and_rust_share_remote_canonical_goldens(
    fixture_name, canonical_name, model, nested_result
):
    value = json.loads(fixture(fixture_name))
    if nested_result:
        value = value["result"]
    decoded = model.from_json(json.dumps(value))
    assert decoded.to_canonical_json() == fixture(canonical_name).strip()


def test_function_version_identity_is_immutable_and_exact():
    value = job_result("remote_function_job.json")
    version = FunctionVersion.from_json(json.dumps(value))
    assert version.name == "embed"
    assert version.version == "1"
    assert version.image.manifest_digest.startswith("sha256:")
    assert version.version != version.image.manifest_digest
    assert list(version.secret_bindings) == [
        SecretBinding(
            kind="env", variable="HF_TOKEN", secret_ref=SecretReference(name="hf-prod")
        )
    ]

    with pytest.raises((TypeError, ValueError)):
        version.version = "1"
    with pytest.raises(TypeError, match="immutable"):
        version.image.descriptor["format_version"] = "changed"

    changed = dict(value)
    changed["version"] = "2"
    assert FunctionVersion(**changed) != version
    assert FunctionVersion(**changed).image == version.image
    for invalid in [version.image.manifest_digest, "0", "01", "-1", str(2**64)]:
        with pytest.raises(ValueError):
            FunctionVersion(**{**value, "version": invalid})


@pytest.mark.parametrize("source_digest", [None, "sha256:source-artifact"])
def test_function_version_preserves_source_digest(source_digest):
    value = job_result("remote_function_job.json")
    legacy = FunctionVersion.from_json(json.dumps(value))
    assert legacy.source_digest is None
    assert "source_digest" not in json.loads(legacy.to_canonical_json())

    value["source_digest"] = source_digest
    version = FunctionVersion.from_json(json.dumps(value))
    assert version.source_digest == source_digest
    assert version.image == legacy.image
    encoded = version.to_canonical_json()
    if source_digest is None:
        assert "source_digest" not in json.loads(encoded)
    else:
        assert json.loads(encoded)["source_digest"] == source_digest
    assert FunctionVersion.from_json(encoded) == version
    with pytest.raises((TypeError, ValueError)):
        version.source_digest = "sha256:changed"


def test_function_version_binds_named_columns_as_one_immutable_application():
    version = FunctionVersion.from_json(
        json.dumps(job_result("remote_function_job.json"))
    )

    application = version(text=col("documents.body"))

    assert application.function.name == version.name
    assert application.function.version == version.version
    assert application.output is version.signature.output
    assert [
        (value.parameter, value.kind, value.value["path"])
        for value in application.inputs
    ] == [("text", "column", "documents.body")]


def test_function_version_names_its_namespace_as_a_separate_field():
    """A Function is named by its parts, as a Secret is; a root one states no
    namespace."""
    value = job_result("remote_function_job.json")
    root = FunctionVersion.from_json(json.dumps(value))
    assert root.namespace_path == ()
    assert "namespace_path" not in json.loads(root.to_canonical_json())

    nested = FunctionVersion(**{**value, "namespace_path": ["analytics", "features"]})
    assert nested.name == "embed"
    assert nested.namespace_path == ("analytics", "features")
    assert json.loads(nested.to_canonical_json())["namespace_path"] == [
        "analytics",
        "features",
    ]
    application = nested(text=col("documents.body"))
    assert application.function.name == "embed"
    assert application.function.namespace_path == ("analytics", "features")
    assert json.loads(application.to_canonical_json())["function"][
        "namespace_path"
    ] == ["analytics", "features"]


def test_function_version_binding_validates_names_and_direct_columns():
    version = FunctionVersion.from_json(
        json.dumps(job_result("remote_function_job.json"))
    )

    with pytest.raises(TypeError, match=r"missing inputs: \['text'\]"):
        version()
    with pytest.raises(TypeError, match=r"unknown arguments: \['body'\]"):
        version(text=col("text"), body=col("body"))
    with pytest.raises(TypeError, match="direct col"):
        version(text=col("text").lower())


def test_function_version_keeps_named_struct_outputs_in_one_application():
    value = job_result("remote_function_job.json")
    value["name"] = "text_features"
    value["version"] = "1"
    value["signature"] = {
        "inputs": [
            {"name": "title", "arrow_type": "utf8", "nullable": True},
            {"name": "body", "arrow_type": "utf8", "nullable": True},
        ],
        "output": {
            "kind": "named_struct",
            "fields": [
                {
                    "name": "normalized_text",
                    "arrow_type": "utf8",
                    "nullable": False,
                },
                {
                    "name": "token_count",
                    "arrow_type": "int64",
                    "nullable": False,
                },
            ],
        },
    }
    version = FunctionVersion(**value)

    application = version(body=col("body"), title=col("title")).rename(
        columns={
            "normalized_text": "search_text",
            "token_count": "search_token_count",
        }
    )

    assert [value.parameter for value in application.inputs] == ["title", "body"]
    assert [field.name for field in application.output.fields] == [
        "normalized_text",
        "token_count",
    ]
    assert dict(application.columns) == {
        "normalized_text": "search_text",
        "token_count": "search_token_count",
    }


def test_unknown_fields_and_discriminators_are_forward_decodable():
    value = job_result("remote_function_job.json")
    value["future_version_metadata"] = {"retention_class": "catalog"}
    value["image"]["descriptor"]["future_interface"] = {"kind": "wasm"}
    value["signature"]["output"]["kind"] = "future_output_shape"

    version = FunctionVersion.from_json(json.dumps(value))
    assert version.image.descriptor["future_interface"] == {"kind": "wasm"}
    assert json.loads(version.to_canonical_json())["image"]["descriptor"][
        "future_interface"
    ] == {"kind": "wasm"}
    assert version.signature.output.kind == "future_output_shape"


def test_function_application_uses_rename_columns_only():
    application = FunctionApplication.from_json(
        fixture("remote_function_application.json")
    )
    renamed = application.rename(columns={"normalized_text": "body_normalized"})

    assert application.columns["normalized_text"] == "search_text"
    assert renamed.columns["normalized_text"] == "body_normalized"
    assert renamed.function == application.function
    assert not hasattr(application, "rename_outputs")
    with pytest.raises(TypeError, match="immutable"):
        renamed.columns["normalized_text"] = "changed"
    with pytest.raises(TypeError, match="immutable"):
        application.inputs[0].value["path"] = "changed"

    with pytest.raises(ValueError, match="unknown Function result fields"):
        application.rename(columns={"missing": "search_text"})
    with pytest.raises(ValueError, match="destinations must be unique"):
        application.rename(columns={"normalized_text": "same", "token_count": "same"})

    bare_value = json.loads(fixture("remote_function_application.json"))
    bare_value.pop("columns")
    bare = FunctionApplication(**bare_value)
    with pytest.raises(ValueError, match="destinations must be unique"):
        bare.rename(columns={"normalized_text": "token_count"})


def test_binding_and_refresh_result_keep_stable_remote_fields():
    binding = FunctionBinding.from_json(fixture("remote_function_binding.json"))
    assert binding.function.version == "1"
    assert [output.output_ordinal for output in binding.outputs] == [0, 1]
    assert binding.input_schema is not None
    assert binding.output_schema is not None

    result = RefreshColumnResult.from_json(
        json.dumps(job_result("remote_refresh_job.json"))
    )
    assert result.rows_filled == result.rows_assigned
    assert result.version == result.published_version

    result = RefreshColumnResult.from_json(
        fixture("remote_refresh_result_without_published_version.json")
    )
    assert result.published_version is None
    assert RefreshColumnResult.from_json(result.to_canonical_json()) == result


def test_initialization_travels_on_the_application_and_binding():
    application = FunctionApplication.from_json(
        fixture("remote_initialized_function_application.json")
    )
    assert application.initialization["temperature"] == 0.25
    assert application.initialization["retry"]["backoff"] == (1, 2, 4)
    application._ensure_declarable()

    binding = FunctionBinding.from_json(
        fixture("remote_initialized_function_binding.json")
    )
    assert binding.initialization_row() == {
        "model": "text-embedding-3-small",
        "dimensions": 512,
    }
    assert (
        FunctionBinding.from_json(
            fixture("remote_function_binding.json")
        ).initialization_row()
        is None
    )

    signature = FunctionVersion.from_json(
        json.dumps(job_result("remote_function_job.json"))
    ).signature
    assert signature.initialization == ()
    assert "initialization" not in json.loads(signature.to_canonical_json())


def test_function_literal_numeric_domain_matches_rust():
    with pytest.raises(ValueError, match="floating-point Function literals"):
        FunctionApplication.from_json(fixture("remote_function_application_float.json"))

    value = json.loads(fixture("remote_function_application_float.json"))
    value["inputs"][0]["value"] = 2**64
    with pytest.raises(ValueError, match="outside the canonical JSON range"):
        FunctionApplication.from_json(json.dumps(value))


def test_empty_default_maps_have_stable_canonical_bytes():
    runtime = PythonRuntimeSpec(
        kind="python", python_version="3.12", environment={"kind": "pip"}
    )
    assert runtime.to_canonical_json() == (
        '{"environment":{"kind":"pip"},"kind":"python","python_version":"3.12"}'
    )

    value = json.loads(fixture("remote_function_application.json"))
    value.pop("columns")
    application = FunctionApplication.from_json(json.dumps(value))
    assert "columns" not in json.loads(application.to_canonical_json())


@pytest.mark.parametrize("field", ["rows_assigned", "source_version"])
def test_refresh_result_rejects_non_u64_values(field):
    value = job_result("remote_refresh_job.json")
    value[field] = -1
    with pytest.raises(ValueError):
        RefreshColumnResult.from_json(json.dumps(value))

    value[field] = "1"
    with pytest.raises(ValueError):
        RefreshColumnResult.from_json(json.dumps(value))


def test_canonical_client_values_carry_bindings_and_no_credentials():
    """A binding names a Secret; the credential behind it has no client field."""
    version = FunctionVersion.from_json(
        json.dumps(job_result("remote_function_job.json"))
    )
    canonical = json.loads(version.to_canonical_json())
    assert canonical["secret_bindings"] == [
        {"kind": "env", "variable": "HF_TOKEN", "secret_ref": {"name": "hf-prod"}}
    ]
    assert_no_secret_values(canonical)


def test_a_version_without_bindings_omits_the_field_in_both_directions():
    """A Function that binds nothing carries no ``secret_bindings`` key.

    Absent decodes as an empty list, and an empty list serializes back to
    absent.
    """
    value = job_result("remote_function_job.json")
    del value["secret_bindings"]
    version = FunctionVersion.from_json(json.dumps(value))
    assert list(version.secret_bindings) == []
    assert "secret_bindings" not in json.loads(version.to_canonical_json())


class _FunctionDeclarationInner:
    def __init__(self):
        self.calls = []

    async def add_function_columns(
        self,
        application_json,
        output_name,
        auto_refresh_enabled,
        auto_refresh_interval_seconds,
    ):
        self.calls.append(
            (
                json.loads(application_json),
                output_name,
                auto_refresh_enabled,
                auto_refresh_interval_seconds,
            )
        )
        return "declared"


def known_application() -> FunctionApplication:
    value = json.loads(fixture("remote_function_application.json"))
    value.pop("future_application")
    return FunctionApplication(**value)


@pytest.mark.asyncio
async def test_add_columns_routes_struct_as_one_and_multi_output_binding_atomically():
    inner = _FunctionDeclarationInner()
    table = AsyncTable(inner)
    application = known_application()

    result = await table.add_columns(
        {"features": application._copy(update={"columns": {}})}
    )
    assert result == "declared"
    assert inner.calls[-1][1] == "features"
    assert inner.calls[-1][2:] == (None, None)

    bare = application._copy(update={"columns": {}}).rename(
        columns={"normalized_text": "search_text"}
    )
    result = await table.add_columns(
        bare, auto_refresh_enabled=False, auto_refresh_interval_seconds=300
    )
    assert result == "declared"
    assert inner.calls[-1][1] is None
    assert inner.calls[-1][0]["columns"] == {"normalized_text": "search_text"}
    assert inner.calls[-1][2:] == (False, 300)


@pytest.mark.asyncio
async def test_add_columns_rejects_multiple_bindings_and_unknown_newer_application():
    inner = _FunctionDeclarationInner()
    table = AsyncTable(inner)
    application = known_application()

    with pytest.raises(ValueError, match="exactly one Function binding"):
        await table.add_columns({"a": application, "b": application})

    future = json.loads(fixture("remote_function_application.json"))
    application = FunctionApplication(**future)
    with pytest.raises(ValueError, match="newer contract"):
        await table.add_columns(application)

    future.pop("future_application")
    future["output"]["assignment"] = "cell_flag"
    application = FunctionApplication(**future)
    assert "assignment" not in json.loads(application.to_canonical_json())["output"]
    with pytest.raises(ValueError, match="output.assignment"):
        await table.add_columns(application)
    assert inner.calls == []


def test_rename_requires_named_struct_and_keeps_partial_mapping_immutable():
    scalar = FunctionApplication.from_json(
        json.dumps(
            {
                "function": {
                    "name": "embed",
                    "version": "1",
                    "object_id": "fixture",
                    "location": "memory:///fixture",
                    "manifest_digest": (
                        "sha256:"
                        "7e22f815b6648e14f093a3979a8e5a2082fa773ebe1ec84b135cae7e84d6f8e6"
                    ),
                },
                "inputs": [],
                "output": {
                    "kind": "scalar",
                    "arrow_type": "list<float32>",
                    "nullable": False,
                },
            }
        )
    )
    with pytest.raises(ValueError, match="named-struct"):
        scalar.rename(columns={"value": "embedding"})

    application = known_application()._copy(update={"columns": {}})
    renamed = application.rename(columns={"normalized_text": "search_text"})
    assert dict(application.columns) == {}
    assert dict(renamed.columns) == {"normalized_text": "search_text"}