"""Step definitions for server client stubs Behave scenarios."""

from __future__ import annotations

import os
import tempfile

from behave import given, then, use_step_matcher, when
from behave.runner import Context
from pydantic import ValidationError

from cleveragents.a2a.clients import (
    AuthClient,
    RemoteExecutionClient,
    ServerClient,
    StubAuthClient,
    StubRemoteExecutionClient,
    StubServerClient,
)
from cleveragents.a2a.server_config import ServerConnectionConfig
from cleveragents.application.services.config_service import _REGISTRY

use_step_matcher("re")


# ---------------------------------------------------------------------------
# ServerConnectionConfig — creation
# ---------------------------------------------------------------------------


@when(r'I create a ServerConnectionConfig with url "(?P<url>[^"]+)"')
def step_create_config(context: Context, url: str) -> None:
    context.server_config = ServerConnectionConfig(server_url=url)


@when(
    r'I create a ServerConnectionConfig with url "(?P<url>[^"]+)" '
    r'and namespace "(?P<ns>[^"]+)"'
)
def step_create_config_ns(context: Context, url: str, ns: str) -> None:
    context.server_config = ServerConnectionConfig(server_url=url, namespace=ns)


@when(
    r'I create a ServerConnectionConfig with url "(?P<url>[^"]+)" '
    r'and auth_token_ref "(?P<ref>[^"]+)"'
)
def step_create_config_auth(context: Context, url: str, ref: str) -> None:
    context.server_config = ServerConnectionConfig(server_url=url, auth_token_ref=ref)


@when(
    r'I create a ServerConnectionConfig with url "(?P<url>[^"]+)" '
    r"and tls_verify false"
)
def step_create_config_tls_false(context: Context, url: str) -> None:
    context.server_config = ServerConnectionConfig(server_url=url, tls_verify=False)


# ---------------------------------------------------------------------------
# ServerConnectionConfig — assertions
# ---------------------------------------------------------------------------


@then(r'the config server_url should be "(?P<expected>[^"]+)"')
def step_config_url(context: Context, expected: str) -> None:
    assert context.server_config.server_url == expected, (
        f"Expected '{expected}', got '{context.server_config.server_url}'"
    )


@then(r'the config namespace should be "(?P<expected>[^"]+)"')
def step_config_namespace(context: Context, expected: str) -> None:
    assert context.server_config.namespace == expected, (
        f"Expected '{expected}', got '{context.server_config.namespace}'"
    )


@then(r'the config auth_token_ref should be "(?P<expected>[^"]+)"')
def step_config_auth_ref(context: Context, expected: str) -> None:
    assert context.server_config.auth_token_ref == expected, (
        f"Expected '{expected}', got '{context.server_config.auth_token_ref}'"
    )


@then(r"the config tls_verify should be true")
def step_config_tls_true(context: Context) -> None:
    assert context.server_config.tls_verify is True


@then(r"the config tls_verify should be false")
def step_config_tls_false(context: Context) -> None:
    assert context.server_config.tls_verify is False


@then(r"the config should be immutable")
def step_config_immutable(context: Context) -> None:
    cfg = context.server_config
    raised = False
    try:
        cfg.__setattr__("server_url", "http://changed.example.com")
    except (ValidationError, AttributeError, TypeError):
        raised = True
    assert raised, "Setting attribute on frozen model should have raised an error"


# ---------------------------------------------------------------------------
# ServerConnectionConfig — validation errors
# ---------------------------------------------------------------------------


@when(r"I try to create a ServerConnectionConfig with empty url")
def step_create_config_empty_url(context: Context) -> None:
    context.caught_error = None
    try:
        ServerConnectionConfig(server_url="")
    except ValidationError as exc:
        context.caught_error = exc


@when(r'I try to create a ServerConnectionConfig with url "(?P<url>[^"]+)"')
def step_create_config_invalid_url(context: Context, url: str) -> None:
    context.caught_error = None
    try:
        ServerConnectionConfig(server_url=url)
    except ValidationError as exc:
        context.caught_error = exc


@when(
    r'I try to create a ServerConnectionConfig with url "(?P<url>[^"]+)" '
    r"and empty namespace"
)
def step_create_config_empty_ns(context: Context, url: str) -> None:
    context.caught_error = None
    try:
        ServerConnectionConfig(server_url=url, namespace="")
    except ValidationError as exc:
        context.caught_error = exc


@then(r"a server config validation error should be raised")
def step_server_config_validation_error(context: Context) -> None:
    assert context.caught_error is not None, "Expected a ValidationError"
    assert isinstance(context.caught_error, ValidationError), (
        f"Expected ValidationError, got {type(context.caught_error)}"
    )


# ---------------------------------------------------------------------------
# StubServerClient
# ---------------------------------------------------------------------------


@given(r"a new StubServerClient")
def step_stub_server_client(context: Context) -> None:
    context.stub_server = StubServerClient()


@when(r"I call health_check on the stub server client")
def step_call_health_check(context: Context) -> None:
    context.caught_error = None
    context.ctx_error = None
    try:
        context.stub_server.health_check()
    except NotImplementedError as exc:
        context.caught_error = exc
        context.ctx_error = exc


@when(r"I call get_version on the stub server client")
def step_call_get_version(context: Context) -> None:
    context.caught_error = None
    context.ctx_error = None
    try:
        context.stub_server.get_version()
    except NotImplementedError as exc:
        context.caught_error = exc
        context.ctx_error = exc


# ---------------------------------------------------------------------------
# StubRemoteExecutionClient
# ---------------------------------------------------------------------------


@given(r"a new StubRemoteExecutionClient")
def step_stub_exec_client(context: Context) -> None:
    context.stub_exec = StubRemoteExecutionClient()


@when(
    r'I call execute_plan with plan_id "(?P<plan_id>[^"]+)" '
    r"on the stub execution client"
)
def step_call_execute_plan(context: Context, plan_id: str) -> None:
    context.caught_error = None
    context.ctx_error = None
    try:
        context.stub_exec.execute_plan(plan_id)
    except NotImplementedError as exc:
        context.caught_error = exc
        context.ctx_error = exc


@when(
    r'I call get_plan_status with plan_id "(?P<plan_id>[^"]+)" '
    r"on the stub execution client"
)
def step_call_get_plan_status(context: Context, plan_id: str) -> None:
    context.caught_error = None
    context.ctx_error = None
    try:
        context.stub_exec.get_plan_status(plan_id)
    except NotImplementedError as exc:
        context.caught_error = exc
        context.ctx_error = exc


@when(
    r'I call cancel_plan with plan_id "(?P<plan_id>[^"]+)" '
    r"on the stub execution client"
)
def step_call_cancel_plan(context: Context, plan_id: str) -> None:
    context.caught_error = None
    context.ctx_error = None
    try:
        context.stub_exec.cancel_plan(plan_id)
    except NotImplementedError as exc:
        context.caught_error = exc
        context.ctx_error = exc


@when(r"I call execute_plan with empty plan_id on the stub execution client")
def step_call_execute_plan_empty(context: Context) -> None:
    context.caught_error = None
    try:
        context.stub_exec.execute_plan("")
    except ValueError as exc:
        context.caught_error = exc


# ---------------------------------------------------------------------------
# StubAuthClient
# ---------------------------------------------------------------------------


@given(r"a new StubAuthClient")
def step_stub_auth_client(context: Context) -> None:
    context.stub_auth = StubAuthClient()


@when(r'I call authenticate with token "(?P<token>[^"]+)" on the stub auth client')
def step_call_authenticate(context: Context, token: str) -> None:
    context.caught_error = None
    context.ctx_error = None
    try:
        context.stub_auth.authenticate(token)
    except NotImplementedError as exc:
        context.caught_error = exc
        context.ctx_error = exc


@when(r'I call validate_token with token "(?P<token>[^"]+)" on the stub auth client')
def step_call_validate_token(context: Context, token: str) -> None:
    context.caught_error = None
    context.ctx_error = None
    try:
        context.stub_auth.validate_token(token)
    except NotImplementedError as exc:
        context.caught_error = exc
        context.ctx_error = exc


@when(r"I call authenticate with empty token on the stub auth client")
def step_call_authenticate_empty(context: Context) -> None:
    context.caught_error = None
    try:
        context.stub_auth.authenticate("")
    except ValueError as exc:
        context.caught_error = exc


# ---------------------------------------------------------------------------
# NotImplementedError and ValueError assertions
# ---------------------------------------------------------------------------

# Note: the step "a NotImplementedError should be raised with message
# containing ..." is already defined in project_context_cli_steps.py
# and looks at context.ctx_error.  Our stub steps store errors in
# context.caught_error, so we bridge by also writing to ctx_error
# in each step that catches NotImplementedError.


@then(r"a ValueError should be raised for empty plan_id")
def step_value_error_plan_id(context: Context) -> None:
    assert context.caught_error is not None, "Expected ValueError"
    assert isinstance(context.caught_error, ValueError), (
        f"Expected ValueError, got {type(context.caught_error)}"
    )


@then(r"a ValueError should be raised for empty token")
def step_value_error_token(context: Context) -> None:
    assert context.caught_error is not None, "Expected ValueError"
    assert isinstance(context.caught_error, ValueError), (
        f"Expected ValueError, got {type(context.caught_error)}"
    )


# ---------------------------------------------------------------------------
# Protocol conformance
# ---------------------------------------------------------------------------


@then(r"StubServerClient should be a runtime instance of ServerClient")
def step_server_protocol(context: Context) -> None:
    assert isinstance(StubServerClient(), ServerClient)


@then(
    r"StubRemoteExecutionClient should be a runtime instance of RemoteExecutionClient"
)
def step_exec_protocol(context: Context) -> None:
    assert isinstance(StubRemoteExecutionClient(), RemoteExecutionClient)


@then(r"StubAuthClient should be a runtime instance of AuthClient")
def step_auth_protocol(context: Context) -> None:
    assert isinstance(StubAuthClient(), AuthClient)


# ---------------------------------------------------------------------------
# Config key registration
# ---------------------------------------------------------------------------


@then(r'config key "(?P<key>[^"]+)" should be registered')
def step_config_key_registered(context: Context, key: str) -> None:
    assert key in _REGISTRY, f"Config key '{key}' not found in registry"


@then(r'config key "(?P<key>[^"]+)" should have default true')
def step_config_key_default_true(context: Context, key: str) -> None:
    entry = _REGISTRY[key]
    assert entry.default is True, f"Expected True, got {entry.default}"


@then(r'config key "(?P<key>[^"]+)" should have default "(?P<default>[^"]+)"')
def step_config_key_default_str(context: Context, key: str, default: str) -> None:
    entry = _REGISTRY[key]
    assert str(entry.default) == default, f"Expected '{default}', got '{entry.default}'"


@then(r'config key "(?P<key>[^"]+)" should use env var "(?P<env_var>[^"]+)"')
def step_config_key_env_var(context: Context, key: str, env_var: str) -> None:
    entry = _REGISTRY[key]
    assert entry.env_var == env_var, (
        f"Expected env var '{env_var}', got '{entry.env_var}'"
    )


# ---------------------------------------------------------------------------
# CLI integration (isolated — uses a temporary HOME to avoid config bleed)
# ---------------------------------------------------------------------------


@given(r"a temporary home directory for server tests")
def step_tmp_home_for_server(context: Context) -> None:
    """Set HOME to a fresh temporary directory so config writes are isolated."""
    context.server_test_home = tempfile.mkdtemp()
    context.server_test_old_home = os.environ.get("HOME")
    os.environ["HOME"] = context.server_test_home


@when(
    r'I invoke server connect with url "(?P<url>[^"]+)" '
    r'and format "(?P<fmt>[^"]+)"'
)
def step_invoke_server_connect(context: Context, url: str, fmt: str) -> None:
    """Run ``server connect <url> --format <fmt>`` and capture output."""
    import io
    import sys

    from cleveragents.cli.main import main as cli_main

    captured = io.StringIO()
    old_stdout = sys.stdout
    sys.stdout = captured
    try:
        context.server_connect_exit = cli_main(
            ["server", "connect", url, "--format", fmt]
        )
    except SystemExit as exc:
        context.server_connect_exit = exc.code if exc.code is not None else 0
    finally:
        sys.stdout = old_stdout
        # Restore HOME
        old_home = getattr(context, "server_test_old_home", None)
        if old_home is not None:
            os.environ["HOME"] = old_home
        else:
            os.environ.pop("HOME", None)
    context.server_connect_output = captured.getvalue()


@then(r'the server connect output should contain "(?P<text>[^"]+)"')
def step_server_connect_output_contains(context: Context, text: str) -> None:
    assert text in context.server_connect_output, (
        f"Expected '{text}' in output: {context.server_connect_output!r}"
    )


@then(r"the server connect should exit with non-zero code")
def step_server_connect_non_zero(context: Context) -> None:
    assert context.server_connect_exit != 0, (
        f"Expected non-zero exit, got {context.server_connect_exit}"
    )


# ---------------------------------------------------------------------------
# Server mode resolution
# ---------------------------------------------------------------------------


@given(r"no server URL is configured")
def step_no_server_url(context: Context) -> None:
    # Ensure the env var is not set and use a clean temp HOME
    os.environ.pop("CLEVERAGENTS_SERVER_URL", None)
    context.clean_home = tempfile.mkdtemp()
    context.old_home = os.environ.get("HOME")
    os.environ["HOME"] = context.clean_home


@then(r'resolve_server_mode should return "(?P<mode>[^"]+)"')
def step_resolve_server_mode(context: Context, mode: str) -> None:
    from cleveragents.cli.commands.server import resolve_server_mode

    try:
        result = resolve_server_mode()
        assert result == mode, f"Expected '{mode}', got '{result}'"
    finally:
        old_home = getattr(context, "old_home", None)
        if old_home is not None:
            os.environ["HOME"] = old_home
        else:
            os.environ.pop("HOME", None)


# Reset step matcher to parse (default) so subsequent step files are not affected
use_step_matcher("parse")