import asyncio
from collections.abc import Callable
import secrets
import time
from dataclasses import dataclass

import pytest

from agenton.compositor import Compositor, LayerNode, LayerProvider
from agenton.layers import LifecycleState
from dify_agent.layers.shell import DIFY_SHELL_LAYER_TYPE_ID, DifyShellLayerConfig
from dify_agent.layers.shell.layer import DifyShellLayer, DifyShellRuntimeState, ShellctlClientFactory
from shell_session_manager.shellctl.shared import DeleteJobResponse, JobResult, JobStatusName, JobStatusView


def _job_result(
    job_id: str,
    *,
    status: JobStatusName = JobStatusName.RUNNING,
    done: bool = False,
    exit_code: int | None = None,
    output: str = "",
    offset: int = 0,
    truncated: bool = False,
    output_path: str = "/tmp/output.log",
) -> JobResult:
    return JobResult(
        job_id=job_id,
        status=status,
        done=done,
        exit_code=exit_code,
        output=output,
        offset=offset,
        truncated=truncated,
        output_path=output_path,
    )


def _job_status(
    job_id: str,
    *,
    status: JobStatusName = JobStatusName.RUNNING,
    done: bool = False,
    exit_code: int | None = None,
    offset: int = 0,
) -> JobStatusView:
    return JobStatusView(
        job_id=job_id,
        status=status,
        done=done,
        exit_code=exit_code,
        created_at="2026-05-28T12:00:00Z",
        started_at="2026-05-28T12:00:01Z",
        ended_at="2026-05-28T12:00:02Z" if done else None,
        offset=offset,
    )


def _assert_error_observation(result: object, *, job_id: str | None = None, includes: str | None = None) -> None:
    assert isinstance(result, dict)
    assert isinstance(result.get("error"), str)
    assert result["error"]
    if job_id is None:
        assert "job_id" not in result
    else:
        assert result.get("job_id") == job_id
    if includes is not None:
        assert includes in result["error"]


@dataclass(slots=True)
class RunCall:
    script: str
    cwd: str | None
    timeout: float


@dataclass(slots=True)
class WaitCall:
    job_id: str
    offset: int
    timeout: float


@dataclass(slots=True)
class InputCall:
    job_id: str
    text: str
    offset: int
    timeout: float


@dataclass(slots=True)
class TerminateCall:
    job_id: str
    grace_seconds: float


@dataclass(slots=True)
class DeleteCall:
    job_id: str
    force: bool
    grace_seconds: float | None


class FakeShellctlClient:
    run_calls: list[RunCall]
    wait_calls: list[WaitCall]
    input_calls: list[InputCall]
    terminate_calls: list[TerminateCall]
    delete_calls: list[DeleteCall]
    events: list[tuple[str, str]]
    closed: bool

    def __init__(
        self,
        *,
        run_handler: Callable[[str, str | None, float], JobResult] | None = None,
        wait_handler: Callable[[str, int, float], JobResult] | None = None,
        input_handler: Callable[[str, str, int, float], JobResult] | None = None,
        terminate_handler: Callable[[str, float], JobStatusView] | None = None,
        delete_handler: Callable[[str, bool, float | None], DeleteJobResponse] | None = None,
    ) -> None:
        self._run_handler = run_handler
        self._wait_handler = wait_handler
        self._input_handler = input_handler
        self._terminate_handler = terminate_handler
        self._delete_handler = delete_handler
        self.run_calls = []
        self.wait_calls = []
        self.input_calls = []
        self.terminate_calls = []
        self.delete_calls = []
        self.events = []
        self.closed = False

    async def run(self, script: str, *, cwd: str | None = None, timeout: float = 10.0) -> JobResult:
        self.run_calls.append(RunCall(script=script, cwd=cwd, timeout=timeout))
        self.events.append(("run", script))
        if self._run_handler is None:
            raise AssertionError("Unexpected run() call")
        return self._run_handler(script, cwd, timeout)

    async def wait(self, job_id: str, *, offset: int, timeout: float = 10.0) -> JobResult:
        self.wait_calls.append(WaitCall(job_id=job_id, offset=offset, timeout=timeout))
        self.events.append(("wait", job_id))
        if self._wait_handler is None:
            raise AssertionError("Unexpected wait() call")
        return self._wait_handler(job_id, offset, timeout)

    async def input(self, job_id: str, text: str, *, offset: int, timeout: float = 10.0) -> JobResult:
        self.input_calls.append(InputCall(job_id=job_id, text=text, offset=offset, timeout=timeout))
        self.events.append(("input", job_id))
        if self._input_handler is None:
            raise AssertionError("Unexpected input() call")
        return self._input_handler(job_id, text, offset, timeout)

    async def terminate(self, job_id: str, grace_seconds: float = 2.0) -> JobStatusView:
        self.terminate_calls.append(TerminateCall(job_id=job_id, grace_seconds=grace_seconds))
        self.events.append(("terminate", job_id))
        if self._terminate_handler is None:
            raise AssertionError("Unexpected terminate() call")
        return self._terminate_handler(job_id, grace_seconds)

    async def delete(
        self,
        job_id: str,
        *,
        force: bool = False,
        grace_seconds: float | None = None,
    ) -> DeleteJobResponse:
        self.delete_calls.append(DeleteCall(job_id=job_id, force=force, grace_seconds=grace_seconds))
        self.events.append(("delete", job_id))
        if self._delete_handler is None:
            return DeleteJobResponse(job_id=job_id)
        return self._delete_handler(job_id, force, grace_seconds)

    async def close(self) -> None:
        self.closed = True
        self.events.append(("close", "client"))


def _shell_layer(*, client_factory: ShellctlClientFactory) -> DifyShellLayer:
    return DifyShellLayer.from_config_with_settings(
        DifyShellLayerConfig(),
        shellctl_entrypoint="http://shellctl",
        shellctl_client_factory=client_factory,
    )


def _shell_provider(*, client_factory: ShellctlClientFactory) -> LayerProvider[DifyShellLayer]:
    return LayerProvider.from_factory(
        layer_type=DifyShellLayer,
        create=lambda config: DifyShellLayer.from_config_with_settings(
            DifyShellLayerConfig.model_validate(config),
            shellctl_entrypoint="http://shellctl",
            shellctl_client_factory=client_factory,
        ),
    )


def test_shell_type_id_constant_matches_implementation_class() -> None:
    assert DIFY_SHELL_LAYER_TYPE_ID == DifyShellLayer.type_id


def test_shell_layer_create_generates_5_plus_2_hex_session_id_and_retries_workspace_collision(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    random_suffixes = iter(["aa", "bb"])
    monkeypatch.setattr(time, "time", lambda: 0x12345F)
    monkeypatch.setattr(secrets, "token_hex", lambda nbytes: next(random_suffixes))

    def run_handler(script: str, cwd: str | None, timeout: float) -> JobResult:
        assert cwd is None
        assert timeout == 30.0
        if "2345faa" in script:
            return _job_result("mkdir-collision", status=JobStatusName.EXITED, done=True, exit_code=17)
        if "2345fbb" in script:
            return _job_result("mkdir-success", status=JobStatusName.RUNNING, done=False, offset=4)
        raise AssertionError(f"Unexpected script: {script}")

    def wait_handler(job_id: str, offset: int, timeout: float) -> JobResult:
        assert job_id == "mkdir-success"
        assert offset == 4
        assert timeout == 30.0
        return _job_result("mkdir-success", status=JobStatusName.EXITED, done=True, exit_code=0, offset=8)

    client = FakeShellctlClient(run_handler=run_handler, wait_handler=wait_handler)
    layer = _shell_layer(client_factory=lambda _entrypoint: client)

    async def scenario() -> None:
        async with layer.resource_context():
            await layer.on_context_create()
            assert client.closed is False

    asyncio.run(scenario())

    assert layer.runtime_state.session_id == "2345fbb"
    assert layer.runtime_state.workspace_cwd == "~/workspace/2345fbb"
    assert layer.runtime_state.job_ids == ["mkdir-collision", "mkdir-success"]
    assert layer.runtime_state.job_offsets == {"mkdir-collision": 0, "mkdir-success": 8}
    assert 'mkdir "$HOME/workspace/2345fbb"' in client.run_calls[1].script
    assert 'mkdir -p "$HOME/workspace/2345fbb"' not in client.run_calls[1].script
    assert client.closed is True


def test_shell_layer_suspend_leaves_client_open_until_resource_context_exits() -> None:
    client = FakeShellctlClient()
    layer = _shell_layer(client_factory=lambda _entrypoint: client)
    layer.runtime_state = DifyShellRuntimeState(session_id="abc12ff", workspace_cwd="~/workspace/abc12ff")

    async def scenario() -> None:
        async with layer.resource_context():
            await layer.on_context_suspend()
            assert client.closed is False

    asyncio.run(scenario())

    assert client.closed is True


def test_shell_layer_suspend_and_resume_reuse_state_with_fresh_clients() -> None:
    first_client = FakeShellctlClient(
        run_handler=lambda _script, _cwd, _timeout: _job_result(
            "mkdir-job",
            status=JobStatusName.EXITED,
            done=True,
            exit_code=0,
        )
    )
    second_client = FakeShellctlClient()
    created_entrypoints: list[str] = []
    clients = iter([first_client, second_client])

    def factory(entrypoint: str) -> FakeShellctlClient:
        created_entrypoints.append(entrypoint)
        return next(clients)

    compositor = Compositor([LayerNode("shell", _shell_provider(client_factory=factory))])
    async def scenario() -> None:
        async with compositor.enter(configs={"shell": DifyShellLayerConfig()}) as run:
            shell_layer = run.get_layer("shell", DifyShellLayer)
            initial_session_id = shell_layer.runtime_state.session_id
            assert initial_session_id is not None
            assert shell_layer.runtime_state.workspace_cwd == f"~/workspace/{initial_session_id}"
            shell_layer.runtime_state.job_ids = [*shell_layer.runtime_state.job_ids, "user-job"]
            shell_layer.runtime_state.job_offsets = {
                **shell_layer.runtime_state.job_offsets,
                "user-job": 42,
            }
            assert first_client.closed is False
            run.suspend_layer_on_exit("shell")

        assert run.session_snapshot is not None
        assert first_client.closed is True
        assert run.session_snapshot.layers[0].lifecycle_state is LifecycleState.SUSPENDED

        async with compositor.enter(
            configs={"shell": DifyShellLayerConfig()},
            session_snapshot=run.session_snapshot,
        ) as resumed_run:
            resumed_shell = resumed_run.get_layer("shell", DifyShellLayer)
            assert second_client.closed is False
            assert resumed_shell.runtime_state.session_id == initial_session_id
            assert resumed_shell.runtime_state.workspace_cwd == f"~/workspace/{initial_session_id}"
            assert set(resumed_shell.runtime_state.job_ids) == {"mkdir-job", "user-job"}
            assert resumed_shell.runtime_state.job_offsets == {"mkdir-job": 0, "user-job": 42}
            resumed_run.suspend_layer_on_exit("shell")

        assert second_client.closed is True

    asyncio.run(scenario())

    assert created_entrypoints == ["http://shellctl", "http://shellctl"]


def test_shell_layer_delete_removes_workspace_then_force_deletes_tracked_jobs_and_closes_client() -> None:
    def run_handler(script: str, cwd: str | None, timeout: float) -> JobResult:
        assert script == 'rm -rf -- "$HOME/workspace/abc12ff"'
        assert cwd is None
        assert timeout == 30.0
        return _job_result("cleanup-job", status=JobStatusName.RUNNING, done=False, offset=3)

    def wait_handler(job_id: str, offset: int, timeout: float) -> JobResult:
        assert job_id == "cleanup-job"
        assert offset == 3
        assert timeout == 30.0
        return _job_result("cleanup-job", status=JobStatusName.EXITED, done=True, exit_code=0, offset=5)

    client = FakeShellctlClient(run_handler=run_handler, wait_handler=wait_handler)
    layer = _shell_layer(client_factory=lambda _entrypoint: client)

    async def scenario() -> None:
        async with layer.resource_context():
            layer.runtime_state = DifyShellRuntimeState(session_id="abc12ff", workspace_cwd="~/workspace/abc12ff")
            layer.runtime_state.job_ids = ["user-job", "mkdir-job"]
            layer.runtime_state.job_offsets = {"user-job": 9, "mkdir-job": 1}
            await layer.on_context_delete()
            assert client.closed is False

    asyncio.run(scenario())

    assert client.events[:2] == [("run", 'rm -rf -- "$HOME/workspace/abc12ff"'), ("wait", "cleanup-job")]
    assert {call.job_id for call in client.delete_calls} == {"user-job", "mkdir-job", "cleanup-job"}
    assert all(client.events.index(("delete", call.job_id)) > client.events.index(("wait", "cleanup-job")) for call in client.delete_calls)
    assert all(call.force is True for call in client.delete_calls)
    assert layer.runtime_state.job_ids == []
    assert layer.runtime_state.job_offsets == {}
    assert client.closed is True


def test_shell_layer_create_failure_force_deletes_internal_jobs_before_reraising() -> None:
    client = FakeShellctlClient(
        run_handler=lambda _script, _cwd, _timeout: _job_result(
            "mkdir-failed",
            status=JobStatusName.EXITED,
            done=True,
            exit_code=1,
        )
    )
    layer = _shell_layer(client_factory=lambda _entrypoint: client)

    async def scenario() -> None:
        with pytest.raises(RuntimeError, match="Failed to create shell workspace"):
            async with layer.resource_context():
                await layer.on_context_create()

    asyncio.run(scenario())

    assert [call.job_id for call in client.delete_calls] == ["mkdir-failed"]
    assert all(call.force is True for call in client.delete_calls)
    assert layer.runtime_state.job_ids == []
    assert layer.runtime_state.job_offsets == {}
    assert client.closed is True


def test_shell_layer_tools_map_inputs_to_shellctl_calls_and_maintain_offsets() -> None:
    def run_handler(script: str, cwd: str | None, timeout: float) -> JobResult:
        assert script == "pwd"
        assert cwd == "~/workspace/abc12ff"
        assert timeout == 2.5
        return _job_result(
            "user-job",
            status=JobStatusName.RUNNING,
            done=False,
            offset=10,
            output="/home/test\n",
        )

    def wait_handler(job_id: str, offset: int, timeout: float) -> JobResult:
        assert job_id == "user-job"
        assert offset == 10
        assert timeout == 4.0
        return _job_result(
            "user-job",
            status=JobStatusName.RUNNING,
            done=False,
            offset=18,
            output="more\n",
        )

    def input_handler(job_id: str, text: str, offset: int, timeout: float) -> JobResult:
        assert job_id == "user-job"
        assert text == "ls\n"
        assert offset == 18
        assert timeout == 5.0
        return _job_result(
            "user-job",
            status=JobStatusName.EXITED,
            done=True,
            exit_code=0,
            offset=22,
            output="file.txt\n",
        )

    def terminate_handler(job_id: str, grace_seconds: float) -> JobStatusView:
        assert job_id == "user-job"
        assert grace_seconds == 1.5
        return _job_status(
            "user-job",
            status=JobStatusName.TERMINATED,
            done=True,
            exit_code=130,
            offset=22,
        )

    client = FakeShellctlClient(
        run_handler=run_handler,
        wait_handler=wait_handler,
        input_handler=input_handler,
        terminate_handler=terminate_handler,
    )
    layer = _shell_layer(client_factory=lambda _entrypoint: client)
    tools = {tool.name: tool for tool in layer.tools}

    async def scenario() -> None:
        async with layer.resource_context():
            layer.runtime_state = DifyShellRuntimeState(session_id="abc12ff", workspace_cwd="~/workspace/abc12ff")

            run_tool_def = await tools["shell.run"].prepare_tool_def(None)  # pyright: ignore[reportArgumentType]
            wait_tool_def = await tools["shell.wait"].prepare_tool_def(None)  # pyright: ignore[reportArgumentType]
            input_tool_def = await tools["shell.input"].prepare_tool_def(None)  # pyright: ignore[reportArgumentType]
            interrupt_tool_def = await tools["shell.interrupt"].prepare_tool_def(None)  # pyright: ignore[reportArgumentType]

            run_result = await tools["shell.run"].function_schema.call(
                {"script": "pwd", "timeout": 2.5},
                None,  # pyright: ignore[reportArgumentType]
            )
            wait_result = await tools["shell.wait"].function_schema.call(
                {"job_id": "user-job", "timeout": 4.0},
                None,  # pyright: ignore[reportArgumentType]
            )
            input_result = await tools["shell.input"].function_schema.call(
                {"job_id": "user-job", "text": "ls\n", "timeout": 5.0},
                None,  # pyright: ignore[reportArgumentType]
            )
            interrupt_result = await tools["shell.interrupt"].function_schema.call(
                {"job_id": "user-job", "grace_seconds": 1.5},
                None,  # pyright: ignore[reportArgumentType]
            )

            assert run_tool_def is not None
            assert wait_tool_def is not None
            assert input_tool_def is not None
            assert interrupt_tool_def is not None
            assert "offset" not in run_tool_def.parameters_json_schema.get("properties", {})
            assert "offset" not in wait_tool_def.parameters_json_schema.get("properties", {})
            assert "offset" not in input_tool_def.parameters_json_schema.get("properties", {})
            assert "offset" not in interrupt_tool_def.parameters_json_schema.get("properties", {})
            assert set(tools) == {"shell.run", "shell.wait", "shell.input", "shell.interrupt"}
            assert run_result["job_id"] == "user-job"
            assert run_result["offset"] == 10
            assert wait_result["offset"] == 18
            assert input_result["offset"] == 22
            assert interrupt_result == {
                "job_id": "user-job",
                "status": "terminated",
                "done": True,
                "exit_code": 130,
                "offset": 22,
            }
            assert client.closed is False

    asyncio.run(scenario())

    assert layer.runtime_state.job_ids == ["user-job"]
    assert layer.runtime_state.job_offsets == {"user-job": 22}
    assert client.closed is True


def test_shell_layer_tools_reject_untracked_job_ids_without_shellctl_calls() -> None:
    client = FakeShellctlClient()
    layer = _shell_layer(client_factory=lambda _entrypoint: client)
    tools = {tool.name: tool for tool in layer.tools}

    async def scenario() -> None:
        async with layer.resource_context():
            layer.runtime_state = DifyShellRuntimeState(session_id="abc12ff", workspace_cwd="~/workspace/abc12ff")

            wait_result = await tools["shell.wait"].function_schema.call(
                {"job_id": "missing-job"},
                None,  # pyright: ignore[reportArgumentType]
            )
            input_result = await tools["shell.input"].function_schema.call(
                {"job_id": "missing-job", "text": "hello"},
                None,  # pyright: ignore[reportArgumentType]
            )
            interrupt_result = await tools["shell.interrupt"].function_schema.call(
                {"job_id": "missing-job"},
                None,  # pyright: ignore[reportArgumentType]
            )

            _assert_error_observation(wait_result, job_id="missing-job")
            _assert_error_observation(input_result, job_id="missing-job")
            _assert_error_observation(interrupt_result, job_id="missing-job")

    asyncio.run(scenario())

    assert client.wait_calls == []
    assert client.input_calls == []
    assert client.terminate_calls == []


def test_shell_layer_hooks_and_tools_fail_clearly_outside_active_resource_context() -> None:
    client = FakeShellctlClient()
    layer = _shell_layer(client_factory=lambda _entrypoint: client)
    layer.runtime_state = DifyShellRuntimeState(session_id="abc12ff", workspace_cwd="~/workspace/abc12ff")
    tools = {tool.name: tool for tool in layer.tools}

    async def scenario() -> None:
        with pytest.raises(RuntimeError, match="resource_context"):
            await layer.on_context_suspend()

        run_result = await tools["shell.run"].function_schema.call(
            {"script": "pwd"},
            None,  # pyright: ignore[reportArgumentType]
        )
        _assert_error_observation(run_result, includes="resource_context")

    asyncio.run(scenario())

    assert client.run_calls == []


def test_shell_runtime_state_rejects_unsafe_resumed_workspace_identity() -> None:
    with pytest.raises(ValueError, match="session_id must match"):
        _ = DifyShellRuntimeState.model_validate(
            {
                "session_id": "../../tmp",
                "workspace_cwd": "~/workspace/../../tmp",
                "job_ids": [],
                "job_offsets": {},
            }
        )

    with pytest.raises(ValueError, match="workspace_cwd must equal"):
        _ = DifyShellRuntimeState.model_validate(
            {
                "session_id": "abc12ff",
                "workspace_cwd": "~/workspace/def34aa",
                "job_ids": [],
                "job_offsets": {},
            }
        )


def test_shell_runtime_state_treats_job_ids_as_opaque_strings_and_rejects_unknown_offset_keys() -> None:
    state = DifyShellRuntimeState.model_validate(
        {
            "session_id": "abc12ff",
            "workspace_cwd": "~/workspace/abc12ff",
            "job_ids": ['job"bad with spaces'],
            "job_offsets": {'job"bad with spaces': 0},
        }
    )

    assert state.job_ids == ['job"bad with spaces']
    assert state.job_offsets == {'job"bad with spaces': 0}

    with pytest.raises(ValueError, match="unknown job ids"):
        _ = DifyShellRuntimeState.model_validate(
            {
                "session_id": "abc12ff",
                "workspace_cwd": "~/workspace/abc12ff",
                "job_ids": ["job-1"],
                "job_offsets": {"job-2": 3},
            }
        )