from __future__ import annotations

from typing import Any, get_args

from pydantic import ValidationError
import pytest

from vibe.core.config import (
    AddOperationPatch,
    RemoveOperationPatch,
    ReplaceOperationPatch,
)
from vibe.core.config.patch import ConfigPatch, PatchOp


@pytest.mark.parametrize(
    ("operation", "expected"),
    [
        (
            AddOperationPatch(path="/tools/disabled_tools/0", value="bash"),
            {"op": "add", "path": "/tools/disabled_tools/0", "value": "bash"},
        ),
        (
            ReplaceOperationPatch(path="/active_model", value="devstral-small"),
            {"op": "replace", "path": "/active_model", "value": "devstral-small"},
        ),
        (
            RemoveOperationPatch(path="/tools/deprecated_setting"),
            {"op": "remove", "path": "/tools/deprecated_setting"},
        ),
    ],
)
def test_json_patch_operations_convert_to_json_patch_payload(
    operation: AddOperationPatch | ReplaceOperationPatch | RemoveOperationPatch,
    expected: dict[str, Any],
) -> None:
    assert operation.to_json_patch() == expected


def test_patch_op_union_contains_all_operations() -> None:
    assert set(get_args(PatchOp.__value__)) == {
        AddOperationPatch,
        ReplaceOperationPatch,
        RemoveOperationPatch,
    }


@pytest.mark.parametrize(
    "factory",
    [
        lambda path: AddOperationPatch(path=path, value="value"),
        lambda path: ReplaceOperationPatch(path=path, value="value"),
        lambda path: RemoveOperationPatch(path=path),
    ],
)
def test_json_patch_operations_reject_non_pointer_paths(factory: Any) -> None:
    with pytest.raises(ValidationError, match="valid JSON Pointer"):
        factory("tools.disabled_tools")


@pytest.mark.parametrize(
    "factory",
    [
        lambda path: AddOperationPatch(path=path, value="value"),
        lambda path: ReplaceOperationPatch(path=path, value="value"),
        lambda path: RemoveOperationPatch(path=path),
    ],
)
def test_json_patch_operations_reject_invalid_escapes(factory: Any) -> None:
    with pytest.raises(ValidationError, match="valid JSON Pointer"):
        factory("/tools/~2")


def test_json_patch_operations_accept_slash_prefixed_paths() -> None:
    op = ReplaceOperationPatch(path="/", value={"active_model": "devstral-small"})

    assert op.path == "/"


def test_config_patch_stores_operations_and_metadata() -> None:
    op = ReplaceOperationPatch(path="/active_model", value="devstral-small")
    patch = ConfigPatch(op, fingerprint="fp-1", reason="test")

    assert patch.operations == [op]
    assert patch.fingerprint == "fp-1"
    assert patch.reason == "test"


def test_config_patch_defaults() -> None:
    patch = ConfigPatch(fingerprint="fp-1")

    assert patch.reason == ""
    assert patch.operations == []


def test_config_patch_accepts_multiple_operations() -> None:
    ops = [
        ReplaceOperationPatch(path="/active_model", value="devstral-small"),
        AddOperationPatch(path="/tools/disabled_tools/-", value="bash"),
    ]
    patch = ConfigPatch(*ops, fingerprint="fp-1")

    assert patch.operations == ops


def test_config_patch_add_appends_operations() -> None:
    patch = ConfigPatch(
        ReplaceOperationPatch(path="/active_model", value="devstral-small"),
        fingerprint="fp-1",
    )
    patch.add(RemoveOperationPatch(path="/tools/deprecated_setting"))

    assert patch.operations == [
        ReplaceOperationPatch(path="/active_model", value="devstral-small"),
        RemoveOperationPatch(path="/tools/deprecated_setting"),
    ]


def test_config_patch_add_returns_self() -> None:
    patch = ConfigPatch(fingerprint="fp-1")
    result = patch.add(
        ReplaceOperationPatch(path="/active_model", value="devstral-small")
    )

    assert result is patch


def test_config_patch_add_accepts_multiple_operations() -> None:
    patch = ConfigPatch(fingerprint="fp-1")
    patch.add(
        ReplaceOperationPatch(path="/active_model", value="devstral-small"),
        AddOperationPatch(path="/tools/disabled_tools/-", value="bash"),
    )

    assert len(patch.operations) == 2


def test_config_patch_add_is_chainable() -> None:
    patch = (
        ConfigPatch(fingerprint="fp-1")
        .add(ReplaceOperationPatch(path="/active_model", value="devstral-small"))
        .add(RemoveOperationPatch(path="/tools/deprecated_setting"))
    )

    assert len(patch.operations) == 2


def test_config_patch_to_json_patch_from_wrappers() -> None:
    patch = ConfigPatch(
        ReplaceOperationPatch(path="/active_model", value="devstral-small"),
        AddOperationPatch(path="/tools/disabled_tools/-", value="bash"),
        RemoveOperationPatch(path="/tools/deprecated_setting"),
        fingerprint="fp-1",
    )

    assert patch.to_json_patch() == [
        {"op": "replace", "path": "/active_model", "value": "devstral-small"},
        {"op": "add", "path": "/tools/disabled_tools/-", "value": "bash"},
        {"op": "remove", "path": "/tools/deprecated_setting"},
    ]


def test_config_patch_describe_add_operation() -> None:
    patch = ConfigPatch(
        AddOperationPatch(path="/tools/disabled_tools/-", value="bash"),
        fingerprint="fp-1",
    )

    assert patch.describe() == ["add '/tools/disabled_tools/-' = 'bash'"]


def test_config_patch_describe_replace_operation() -> None:
    patch = ConfigPatch(
        ReplaceOperationPatch(path="/active_model", value="devstral-small"),
        fingerprint="fp-1",
    )

    assert patch.describe() == ["replace '/active_model' = 'devstral-small'"]


def test_config_patch_describe_remove_operation() -> None:
    patch = ConfigPatch(
        RemoveOperationPatch(path="/tools/deprecated_setting"), fingerprint="fp-1"
    )

    assert patch.describe() == ["remove '/tools/deprecated_setting'"]


def test_config_patch_describe_empty_returns_empty_list() -> None:
    patch = ConfigPatch(fingerprint="fp-1")

    assert patch.describe() == []


def test_config_patch_describe_multiple_operations() -> None:
    patch = ConfigPatch(
        ReplaceOperationPatch(path="/active_model", value="devstral-small"),
        AddOperationPatch(path="/tools/disabled_tools/-", value="bash"),
        RemoveOperationPatch(path="/tools/deprecated_setting"),
        fingerprint="fp-1",
    )

    assert patch.describe() == [
        "replace '/active_model' = 'devstral-small'",
        "add '/tools/disabled_tools/-' = 'bash'",
        "remove '/tools/deprecated_setting'",
    ]


def test_scenario_build_patch_incrementally() -> None:
    patch = ConfigPatch(fingerprint="fp-abc", reason="/model command")
    patch.add(ReplaceOperationPatch(path="/active_model", value="devstral-small"))
    patch.add(AddOperationPatch(path="/tools/disabled_tools/-", value="bash"))

    assert patch.fingerprint == "fp-abc"
    assert patch.reason == "/model command"
    assert len(patch.operations) == 2
    assert patch.describe() == [
        "replace '/active_model' = 'devstral-small'",
        "add '/tools/disabled_tools/-' = 'bash'",
    ]