"""Wire-contract tests for the canonical /openapi/v1 error body."""

import uuid
from types import SimpleNamespace
from unittest.mock import MagicMock, patch

import pytest
from flask import Flask
from sqlalchemy.orm import Session
from werkzeug.exceptions import (
    BadGateway,
    BadRequest,
    Conflict,
    Forbidden,
    InternalServerError,
    NotFound,
    TooManyRequests,
    Unauthorized,
    UnprocessableEntity,
)

from constants.oauth_bearer import TokenType
from controllers.common.errors import (
    BlockedFileExtensionError,
    FileTooLargeError,
    NoFileUploadedError,
    TooManyFilesError,
    UnsupportedFileTypeError,
)
from controllers.openapi._catalog import CATALOG_HEADER, catalog_for
from controllers.openapi._errors import (
    CatalogStale,
    DslInvalid,
    ErrorBody,
    ErrorDetail,
    FilenameNotExists,
    HumanInputFormNotFound,
    KnowledgeFsAccessDeniedError,
    KnowledgeFsConflictError,
    KnowledgeFsInvalidRequestError,
    KnowledgeFsRequestRejectedError,
    KnowledgeFsRequestTooLargeError,
    KnowledgeFsResourceNotFoundError,
    KnowledgeFsUnavailableError,
    MemberLicenseExceeded,
    MemberLimitExceeded,
    OpenApiError,
    OpenApiErrorCode,
    OpenApiErrorFormatter,
    RecipientSurfaceMismatch,
)
from controllers.openapi._models import Hint
from controllers.service_api.app.error import (
    AgentNotPublishedError,
    AppUnavailableError,
    CompletionRequestError,
    ConversationCompletedError,
    ProviderModelCurrentlyNotSupportError,
    ProviderNotInitializeError,
    ProviderQuotaExceededError,
)
from controllers.web.error import InvokeRateLimitError as InvokeRateLimitHttpError
from libs.oauth_bearer import AuthContext
from models.account import Account, AccountStatus
from services.oauth_device_contracts import ExpiredTokenError


@pytest.fixture
def fmt() -> OpenApiErrorFormatter:
    return OpenApiErrorFormatter()


class TestErrorBodyModel:
    def test_minimal_body_serializes_without_optional_fields(self) -> None:
        body = ErrorBody(code=OpenApiErrorCode.NOT_FOUND, message="app not found", status=404)

        wire = body.model_dump(mode="json", exclude_none=True)

        assert wire == {"code": "not_found", "message": "app not found", "status": 404}

    def test_full_body_round_trips(self) -> None:
        body = ErrorBody(
            code=OpenApiErrorCode.INVALID_PARAM,
            message="Request validation failed",
            status=422,
            hint="check the request payload",
            details=[ErrorDetail(type="int_parsing", loc=["page"], msg="must be >= 1")],
        )

        wire = body.model_dump(mode="json", exclude_none=True)

        assert wire["details"] == [{"type": "int_parsing", "loc": ["page"], "msg": "must be >= 1"}]
        assert ErrorBody.model_validate(wire) == body

    def test_code_field_is_open_string_for_forward_compat(self) -> None:
        # Old CLIs must not hard-fail when a future server adds a code, so the
        # schema type is str; enum membership is enforced by the formatter tests.
        body = ErrorBody.model_validate({"code": "some_future_code", "message": "x", "status": 400})

        assert body.code == "some_future_code"


class _DataCarryingUnprocessableEntity(UnprocessableEntity):
    """flask_restx attaches ``abort(422, ...)`` kwargs as ``e.data`` at runtime.

    Declaring the attribute keeps the type checker honest without an ignore, and
    the instance is still the real ``UnprocessableEntity`` the framework raises.
    """

    data: dict[str, object]


class TestOpenApiErrorFormatter:
    def test_flask_restx_abort_data_path_yields_canonical_body(self, fmt: OpenApiErrorFormatter) -> None:
        # Simulates _contract.py's abort(422, message=..., errors=...): flask_restx
        # attaches kwargs to e.data, which handle_error would otherwise put on the
        # wire verbatim (no code/status).
        e = _DataCarryingUnprocessableEntity()
        e.data = {
            "message": "Request validation failed",
            "errors": [{"type": "int_parsing", "loc": ["page"], "msg": "must be >= 1", "extra": "drop me"}],
        }
        data = {"code": "unprocessable_entity", "message": e.description, "status": 422}

        wire = fmt.finalize(e, data, 422)

        assert wire["code"] == "invalid_param"
        assert wire["message"] == "Request validation failed"
        assert wire["status"] == 422
        assert wire["details"] == [{"type": "int_parsing", "loc": ["page"], "msg": "must be >= 1"}]
        # the override channel now carries the canonical body
        assert e.data == wire

    def test_finalize_is_idempotent(self, fmt: OpenApiErrorFormatter) -> None:
        e = _DataCarryingUnprocessableEntity()
        e.data = {
            "message": "Request validation failed",
            "errors": [{"type": "int_parsing", "loc": ["page"], "msg": "must be >= 1"}],
        }
        data = {"code": "unprocessable_entity", "message": e.description, "status": 422}

        first = fmt.finalize(e, data, 422)
        second = fmt.finalize(e, data, 422)

        assert second == first

    def test_malformed_canonical_details_falls_back_instead_of_raising(self, fmt: OpenApiErrorFormatter) -> None:
        # finalize runs inside the framework error handler; a ValidationError
        # escaping it would replace the response with an unformatted 500
        e = _DataCarryingUnprocessableEntity()
        e.data = {"message": "broken", "details": [{"bad": "shape"}]}
        data = {"code": "unprocessable_entity", "message": "broken", "status": 422}

        wire = fmt.finalize(e, data, 422)

        assert wire == {"code": "invalid_param", "message": "Unprocessable Entity", "status": 422}

    def test_params_shape_becomes_details(self, fmt: OpenApiErrorFormatter) -> None:
        e = ValueError("is required")
        data = {"code": "invalid_param", "message": "is required", "params": "email", "status": 400}

        wire = fmt.finalize(e, data, 400)

        assert "params" not in wire
        assert wire["details"] == [{"type": "invalid", "loc": ["email"], "msg": "is required"}]

    def test_catch_all_exception_never_leaks_str_e(self, fmt: OpenApiErrorFormatter) -> None:
        e = RuntimeError("postgres password=hunter2 connection refused")
        data = {"message": str(e), "code": "unknown", "status": 500}

        wire = fmt.finalize(e, data, 500)

        assert wire["code"] == "internal_server_error"
        assert "hunter2" not in wire["message"]

    def test_unmapped_status_falls_back_to_unknown(self, fmt: OpenApiErrorFormatter) -> None:
        from werkzeug.exceptions import Gone

        e = Gone()
        data = {"code": "gone", "message": e.description, "status": 410}

        wire = fmt.finalize(e, data, 410)

        assert wire["code"] == "unknown"

    @pytest.mark.parametrize("message", [None, "custom reason"], ids=["class_description", "call_site_override"])
    def test_openapi_error_subclass_is_throw_and_done(self, fmt: OpenApiErrorFormatter, message: str) -> None:
        # The dedicated throwable: subclass declares status + code + message once,
        # call sites just `raise`, or pass a message to override the description;
        # the formatter emits everything verbatim.
        class TeapotError(OpenApiError):
            code = 418
            error_code = OpenApiErrorCode.INVALID_PARAM
            description = "kettle says no"

        e = TeapotError(message, details=[ErrorDetail(type="invalid", loc=["kettle"], msg="too hot")])
        data = {"code": "im_a_teapot", "message": e.description, "status": 418}

        wire = fmt.finalize(e, data, 418)

        assert wire["code"] == OpenApiErrorCode.INVALID_PARAM
        assert wire["message"] == (message or TeapotError.description)
        assert wire["details"] == [{"type": "invalid", "loc": ["kettle"], "msg": "too hot"}]


class TestQuotaExceptions:
    @pytest.mark.parametrize("exc_class", [MemberLimitExceeded, MemberLicenseExceeded])
    def test_quota_exception_carries_declared_code_and_message(
        self, fmt: OpenApiErrorFormatter, exc_class: type[OpenApiError]
    ) -> None:
        # Single source: assertions read the class attributes, no re-typed strings.
        e = exc_class()
        data = {"code": "forbidden", "message": e.description, "status": 403}

        wire = fmt.finalize(e, data, 403)

        assert wire["code"] == exc_class.error_code
        assert wire["message"] == exc_class.description
        assert wire["hint"] == exc_class.hint
        assert wire["status"] == 403


class TestWireContract:
    """End-to-end: request in, canonical JSON out, through the real openapi blueprint."""

    def test_accepts_422_carries_code_status_details(
        self, openapi_app: Flask, sqlite_session: Session, monkeypatch: pytest.MonkeyPatch
    ) -> None:
        """`@endpoint` runs auth outermost, so reaching `@accepts` means passing
        it: one account row and a stubbed authenticator are the whole world
        `GET /account/sessions` needs.
        """
        account_id = uuid.uuid4()
        account = Account(name="caller", email="caller@example.com", status=AccountStatus.ACTIVE)
        account.id = str(account_id)
        sqlite_session.add(account)
        sqlite_session.commit()

        token = AuthContext(
            subject_email="caller@example.com",
            subject_issuer="dify:account",
            account_id=account_id,
            client_id="difyctl",
            token_id=uuid.uuid4(),
            token_type=TokenType.OAUTH_ACCOUNT,
            expires_at=None,
        )
        monkeypatch.setattr(
            "controllers.openapi.auth.router.get_authenticator",
            lambda: SimpleNamespace(authenticate=lambda _token: token),
        )
        monkeypatch.setattr("controllers.openapi.auth.pipelines._mount_flask_login", lambda _user: None)

        resp = openapi_app.test_client().get(
            "/openapi/v1/account/sessions?page=0",
            headers={"Authorization": "Bearer dfoa_wire", CATALOG_HEADER: catalog_for(openapi_app)[1]},
        )

        assert resp.status_code == 422, resp.get_json()
        wire = resp.get_json()
        ErrorBody.model_validate(wire)
        assert wire["code"] == "invalid_param"
        assert wire["status"] == 422
        assert wire["details"]

    def test_unknown_route_404_is_canonical_without_route_suggestions(self, openapi_app: Flask) -> None:
        client = openapi_app.test_client()

        resp = client.get("/openapi/v1/definitely-not-a-route")

        assert resp.status_code == 404
        wire = resp.get_json()
        ErrorBody.model_validate(wire)
        assert wire["code"] == "not_found"
        assert "did you mean" not in wire["message"].lower()

    def test_404_outside_blueprint_prefix_is_not_claimed(self, openapi_app: Flask) -> None:
        # catch_all_404s wraps the app-level exception handler; the prefix
        # guard must keep non-/openapi/v1 paths on the app's own 404 handling
        client = openapi_app.test_client()

        resp = client.get("/console/definitely-not-a-route")

        assert resp.status_code == 404
        # not intercepted → Flask's default HTML 404, not the canonical JSON body
        assert "application/json" not in (resp.content_type or "")

    @patch("controllers.openapi.oauth_device.application_services")
    def test_oauth_device_token_keeps_rfc8628_shape(
        self, mock_application_services: MagicMock, openapi_app: Flask
    ) -> None:
        mock_application_services.return_value.oauth_device.poll.side_effect = ExpiredTokenError

        client = openapi_app.test_client()

        resp = client.post(
            "/openapi/v1/oauth/device/token",
            json={"client_id": "difyctl", "device_code": "nope"},
        )

        assert resp.status_code == 400
        wire = resp.get_json()
        assert wire == {"error": "expired_token"}


ERROR_MATRIX = [
    (BadRequest("x"), 400, "bad_request"),
    (Unauthorized("x"), 401, "unauthorized"),
    (Forbidden("x"), 403, "forbidden"),
    (NotFound("x"), 404, "not_found"),
    (Conflict("x"), 409, "conflict"),
    (UnprocessableEntity("x"), 422, "invalid_param"),
    (InternalServerError(), 500, "internal_server_error"),
    (BadGateway("x"), 502, "bad_gateway"),
    (AppUnavailableError(), 400, "app_unavailable"),
    (AgentNotPublishedError(), 400, "agent_not_published"),
    (ConversationCompletedError(), 400, "conversation_completed"),
    (ProviderNotInitializeError(), 400, "provider_not_initialize"),
    (ProviderQuotaExceededError(), 400, "provider_quota_exceeded"),
    (ProviderModelCurrentlyNotSupportError(), 400, "model_currently_not_support"),
    (CompletionRequestError(), 400, "completion_request_error"),
    (InvokeRateLimitHttpError(), 429, "rate_limit_error"),
    (TooManyRequests("x"), 429, "too_many_requests"),  # difyctl's classifyRateLimit keys retryability on this code
    (FileTooLargeError(), 413, "file_too_large"),
    (UnsupportedFileTypeError(), 415, "unsupported_file_type"),
    (NoFileUploadedError(), 400, "no_file_uploaded"),
    (TooManyFilesError(), 400, "too_many_files"),
    (FilenameNotExists(), 400, "filename_not_exists"),
    (BlockedFileExtensionError(), 400, "file_extension_blocked"),
    (MemberLimitExceeded(), 403, "member_limit_exceeded"),
    (MemberLicenseExceeded(), 403, "member_license_exceeded"),
    (HumanInputFormNotFound(), 404, "form_not_found"),
    (RecipientSurfaceMismatch(), 403, "recipient_surface_mismatch"),
    (KnowledgeFsInvalidRequestError(), 400, "knowledge_fs_invalid_request"),
    (KnowledgeFsAccessDeniedError(), 403, "knowledge_fs_access_denied"),
    (KnowledgeFsResourceNotFoundError(), 404, "knowledge_fs_resource_not_found"),
    (KnowledgeFsConflictError(), 409, "knowledge_fs_conflict"),
    (KnowledgeFsRequestTooLargeError(), 413, "knowledge_fs_request_too_large"),
    (KnowledgeFsRequestRejectedError(), 422, "knowledge_fs_request_rejected"),
    (KnowledgeFsUnavailableError(), 503, "knowledge_fs_unavailable"),
    (CatalogStale(), 412, "catalog_stale"),
]


class TestErrorMatrix:
    @pytest.mark.parametrize(
        ("exc", "status", "expected_code"),
        ERROR_MATRIX,
        ids=lambda v: type(v).__name__ if isinstance(v, Exception) else str(v),
    )
    def test_every_known_error_path_yields_canonical_code(
        self, fmt: OpenApiErrorFormatter, exc: Exception, status: int, expected_code: str
    ) -> None:
        data = dict(getattr(exc, "data", None) or {"message": str(exc), "status": status})

        wire = fmt.finalize(exc, data, status)

        assert wire["code"] == expected_code
        assert wire["status"] == status
        assert wire["code"] in {c.value for c in OpenApiErrorCode}
        ErrorBody.model_validate(wire)


class TestErrorCodeEnumRegistration:
    def test_enum_registered_with_all_values(self) -> None:
        from controllers.openapi import openapi_ns
        from controllers.openapi._errors import OpenApiErrorCode

        model = openapi_ns.models.get("OpenApiErrorCode")
        assert model is not None
        schema = model.__schema__
        assert schema["type"] == "string"
        assert set(schema["enum"]) == {member.value for member in OpenApiErrorCode}


def test_error_body_carries_hints() -> None:
    hint = Hint(summary="Check the DSL", op="check.console_app.dsl", input={})
    error = DslInvalid(hints=[hint])
    assert error.hints == [hint]
    body = ErrorBody(code="dsl_invalid", message="m", status=422, hints=[hint])
    assert body.model_dump(exclude_none=True)["hints"][0]["op"] == "check.console_app.dsl"


def test_formatter_emits_hints_only_from_openapi_errors() -> None:
    hint = Hint(summary="Check the DSL", op="check.console_app.dsl", input={"yaml_content": None})
    wire = OpenApiErrorFormatter().finalize(DslInvalid(hints=[hint]), {}, 422)
    assert (wire["code"], wire["hints"]) == ("dsl_invalid", [hint.model_dump(mode="json", exclude_none=True)])

    foreign = BadRequest()
    foreign.hints = [hint]  # type: ignore[attr-defined]
    assert "hints" not in OpenApiErrorFormatter().finalize(foreign, {}, 400)