"""Step definitions for plan_executor.py coverage tests.

Targets uncovered lines: 144, 233-235, 273, 483, 490.
"""

from __future__ import annotations

from typing import Any
from unittest.mock import MagicMock

from behave import given, then, when
from behave.runner import Context

from cleveragents.application.services.plan_executor import (
    ExecuteResult,
    ExecuteStubActor,
    PlanExecutor,
    StrategizeResult,
    StrategizeStubActor,
    StrategyDecision,
)
from cleveragents.core.exceptions import PlanError, ValidationError
from cleveragents.domain.models.core.plan import (
    InvariantSource,
    PlanInvariant,
    PlanPhase,
    PlanTimestamps,
    ProcessingState,
)

# ---------------------------------------------------------------------------
# Helpers
# ---------------------------------------------------------------------------

PLAN_ID = "01HABCDE12345678901234PLAN"


def _make_mock_plan(
    *,
    phase: PlanPhase = PlanPhase.STRATEGIZE,
    state: ProcessingState = ProcessingState.QUEUED,
    definition_of_done: str | None = "Step one\nStep two",
    decision_root_id: str | None = "01HROOT000000000000000ROOT",
    invariants: list[PlanInvariant] | None = None,
) -> MagicMock:
    """Build a mock plan object with sensible defaults."""
    plan = MagicMock()
    plan.phase = phase
    plan.state = state
    plan.processing_state = state
    plan.definition_of_done = definition_of_done
    plan.decision_root_id = decision_root_id
    plan.invariants = invariants or []
    plan.timestamps = PlanTimestamps()
    plan.changeset_id = None
    plan.sandbox_refs = []
    plan.error_details = None
    return plan


def _make_lifecycle(plan: Any | None = None) -> MagicMock:
    """Build a mock lifecycle service returning *plan* on get_plan."""
    lcs = MagicMock()
    if plan is not None:
        lcs.get_plan.return_value = plan
    lcs.start_strategize = MagicMock()
    lcs.complete_strategize = MagicMock()
    lcs.fail_strategize = MagicMock()
    lcs.start_execute = MagicMock()
    lcs.complete_execute = MagicMock()
    lcs.fail_execute = MagicMock()
    lcs._commit_plan = MagicMock()
    return lcs


# ---------------------------------------------------------------------------
# StrategizeStubActor._parse_steps  (line 144)
# ---------------------------------------------------------------------------


@given("a StrategizeStubActor instance for coverage")
def step_given_strategize_stub(context: Context) -> None:
    context.strategize_actor = StrategizeStubActor()


@when("I call _parse_steps with an empty string")
def step_parse_steps_empty(context: Context) -> None:
    context.parsed_steps = context.strategize_actor._parse_steps("")


@when("I call _parse_steps with whitespace only")
def step_parse_steps_whitespace(context: Context) -> None:
    context.parsed_steps = context.strategize_actor._parse_steps("   \n\t  ")


@then("the parsed steps should be the default fallback")
def step_check_default_steps(context: Context) -> None:
    assert context.parsed_steps == ["Complete the plan objectives"], (
        f"Expected default fallback, got {context.parsed_steps}"
    )


# ---------------------------------------------------------------------------
# StrategizeStubActor.execute happy paths
# ---------------------------------------------------------------------------


@when("I execute the strategize stub with a valid plan and definition of done")
def step_exec_strategize_valid(context: Context) -> None:
    context.strategize_result = context.strategize_actor.execute(
        plan_id=PLAN_ID,
        definition_of_done="First step\nSecond step",
    )


@then("the strategize result should contain decisions matching the steps")
def step_check_strategize_decisions(context: Context) -> None:
    result: StrategizeResult = context.strategize_result
    assert len(result.decisions) == 2
    assert result.decisions[0].step_text == "First step"
    assert result.decisions[1].step_text == "Second step"
    assert result.decision_root_id == result.decisions[0].decision_id


@when("I execute the strategize stub with a None definition of done")
def step_exec_strategize_none_dod(context: Context) -> None:
    context.strategize_result = context.strategize_actor.execute(
        plan_id=PLAN_ID,
        definition_of_done=None,
    )


@then("the strategize result should contain the default decision")
def step_check_default_decision(context: Context) -> None:
    result: StrategizeResult = context.strategize_result
    assert len(result.decisions) == 1
    assert result.decisions[0].step_text == "Complete the plan objectives"


@when("I execute the strategize stub with an empty plan_id")
def step_exec_strategize_empty_plan_id(context: Context) -> None:
    try:
        context.strategize_actor.execute(plan_id="", definition_of_done="x")
        context.raised_exception = None
    except Exception as exc:
        context.raised_exception = exc


@then('a plan executor ValidationError should be raised containing "{text}"')
def step_check_validation_error(context: Context, text: str) -> None:
    assert context.raised_exception is not None, (
        "Expected an exception but none was raised"
    )
    assert isinstance(context.raised_exception, ValidationError), (
        f"Expected ValidationError, got {type(context.raised_exception).__name__}"
    )
    assert text in str(context.raised_exception), (
        f"Expected '{text}' in '{context.raised_exception}'"
    )


@when("I execute the strategize stub with invariants")
def step_exec_strategize_with_invariants(context: Context) -> None:
    invariants = [
        PlanInvariant(text="Must be safe", source=InvariantSource.PLAN),
        PlanInvariant(text="Must be fast", source=InvariantSource.PROJECT),
    ]
    context.strategize_result = context.strategize_actor.execute(
        plan_id=PLAN_ID,
        definition_of_done="Do it",
        invariants=invariants,
    )


@then("the strategize result should contain invariant records")
def step_check_invariant_records(context: Context) -> None:
    result: StrategizeResult = context.strategize_result
    assert len(result.invariant_records) == 2
    assert result.invariant_records[0]["text"] == "Must be safe"
    assert result.invariant_records[1]["source"] == "project"


@when("I execute the strategize stub with a stream callback")
def step_exec_strategize_with_callback(context: Context) -> None:
    context.stream_events = []

    def _cb(event: str, data: dict) -> None:
        context.stream_events.append((event, data))

    context.strategize_result = context.strategize_actor.execute(
        plan_id=PLAN_ID,
        definition_of_done="A step",
        stream_callback=_cb,
    )


@then("the stream callback should have been called with strategize events")
def step_check_stream_events(context: Context) -> None:
    event_names = [e[0] for e in context.stream_events]
    assert "strategize_started" in event_names
    assert "strategize_decisions" in event_names
    assert "strategize_complete" in event_names


# ---------------------------------------------------------------------------
# ExecuteStubActor
# ---------------------------------------------------------------------------


@given("an ExecuteStubActor instance for coverage")
def step_given_execute_stub(context: Context) -> None:
    context.execute_actor = ExecuteStubActor()


@when("I execute the execute stub with decisions")
def step_exec_execute_stub(context: Context) -> None:
    decisions = [
        StrategyDecision(
            decision_id="01HDEC0000000000000000DEC0",
            step_text="Do the thing",
            sequence=0,
        ),
    ]
    context.execute_result = context.execute_actor.execute(
        plan_id=PLAN_ID,
        decisions=decisions,
    )


@then("the execute result should contain a changeset id")
def step_check_execute_changeset(context: Context) -> None:
    result: ExecuteResult = context.execute_result
    assert result.changeset_id is not None
    assert len(result.changeset_id) > 0


@when("I execute the execute stub with an empty plan_id")
def step_exec_execute_stub_empty_plan_id(context: Context) -> None:
    try:
        context.execute_actor.execute(plan_id="", decisions=[])
        context.raised_exception = None
    except Exception as exc:
        context.raised_exception = exc


# ---------------------------------------------------------------------------
# PlanExecutor construction
# ---------------------------------------------------------------------------


@when("I construct a PlanExecutor with None lifecycle service")
def step_construct_none_lifecycle(context: Context) -> None:
    try:
        PlanExecutor(lifecycle_service=None)
        context.raised_exception = None
    except Exception as exc:
        context.raised_exception = exc


@given("a fresh mock lifecycle for plan executor coverage")
def step_given_fresh_mock_lifecycle(context: Context) -> None:
    context.lifecycle = _make_lifecycle()


@when("I construct a PlanExecutor without execution context")
def step_construct_no_ctx(context: Context) -> None:
    context.executor = PlanExecutor(
        lifecycle_service=context.lifecycle,
        execution_context=None,
    )


@then("plan executor has_runtime should be False")
def step_check_no_runtime(context: Context) -> None:
    assert context.executor.has_runtime is False


@then("plan executor changeset_store should be None")
def step_check_no_changeset_store(context: Context) -> None:
    assert context.executor.changeset_store is None


@then("plan executor execution_context should be None")
def step_check_no_execution_context(context: Context) -> None:
    assert context.executor.execution_context is None


# ---------------------------------------------------------------------------
# PlanExecutor.run_strategize happy path
# ---------------------------------------------------------------------------


@given("a mock lifecycle with a plan in Strategize phase for executor coverage")
def step_given_lifecycle_strategize(context: Context) -> None:
    plan = _make_mock_plan(
        phase=PlanPhase.STRATEGIZE,
        state=ProcessingState.QUEUED,
        definition_of_done="Build the widget",
    )
    context.lifecycle = _make_lifecycle(plan)
    context.plan_id = PLAN_ID


@given("a PlanExecutor using that lifecycle for coverage")
def step_given_executor(context: Context) -> None:
    context.executor = PlanExecutor(lifecycle_service=context.lifecycle)


@when("I call run_strategize on the PlanExecutor for coverage")
def step_run_strategize(context: Context) -> None:
    context.strategize_result = context.executor.run_strategize(context.plan_id)


@then("the strategize result should be returned successfully")
def step_check_strategize_ok(context: Context) -> None:
    assert isinstance(context.strategize_result, StrategizeResult)
    assert len(context.strategize_result.decisions) > 0


@then("the lifecycle should have called start_strategize for coverage")
def step_check_start_strategize(context: Context) -> None:
    context.lifecycle.start_strategize.assert_called_once_with(context.plan_id)


@then("the lifecycle should have called complete_strategize for coverage")
def step_check_complete_strategize(context: Context) -> None:
    context.lifecycle.complete_strategize.assert_called_once_with(context.plan_id)


# ---------------------------------------------------------------------------
# PlanExecutor.run_strategize exception path (line 273)
# ---------------------------------------------------------------------------


@given("a mock lifecycle with a plan in Strategize phase that will fail during execute")
def step_given_lifecycle_strategize_fail(context: Context) -> None:
    plan = _make_mock_plan(
        phase=PlanPhase.STRATEGIZE,
        state=ProcessingState.QUEUED,
        definition_of_done="Build the widget",
    )
    context.lifecycle = _make_lifecycle(plan)
    context.plan_id = PLAN_ID


@given("a PlanExecutor using that failing lifecycle for coverage")
def step_given_executor_failing(context: Context) -> None:
    context.executor = PlanExecutor(lifecycle_service=context.lifecycle)
    # Patch the internal strategize actor to raise
    context.executor._strategize_actor = MagicMock()
    context.executor._strategize_actor.execute.side_effect = RuntimeError(
        "Boom in strategize"
    )


@when("I call run_strategize expecting an exception for coverage")
def step_run_strategize_fail(context: Context) -> None:
    try:
        context.executor.run_strategize(context.plan_id)
        context.raised_exception = None
    except RuntimeError as exc:
        context.raised_exception = exc


@then("the lifecycle should have called fail_strategize for coverage")
def step_check_fail_strategize(context: Context) -> None:
    assert context.raised_exception is not None, "Expected an exception"
    context.lifecycle.fail_strategize.assert_called_once()
    call_args = context.lifecycle.fail_strategize.call_args
    assert context.plan_id in call_args[0]
    assert "RuntimeError" in call_args[0][1]


# ---------------------------------------------------------------------------
# PlanExecutor.run_strategize wrong phase
# ---------------------------------------------------------------------------


@given("a mock lifecycle with a plan in Execute phase for executor coverage")
def step_given_lifecycle_execute_phase(context: Context) -> None:
    plan = _make_mock_plan(phase=PlanPhase.EXECUTE)
    context.lifecycle = _make_lifecycle(plan)
    context.plan_id = PLAN_ID


@when("I call run_strategize expecting a PlanError for coverage")
def step_run_strategize_wrong_phase(context: Context) -> None:
    try:
        context.executor.run_strategize(context.plan_id)
        context.raised_exception = None
    except PlanError as exc:
        context.raised_exception = exc


@then("a PlanError should be raised about wrong phase for coverage")
def step_check_wrong_phase_error(context: Context) -> None:
    assert context.raised_exception is not None, "Expected a PlanError"
    assert isinstance(context.raised_exception, PlanError)
    assert "not in Strategize phase" in str(context.raised_exception)


# ---------------------------------------------------------------------------
# PlanExecutor._guard_execute: decision_root_id is None (lines 233-235)
# ---------------------------------------------------------------------------


@given("a mock lifecycle with an execute-phase plan missing decision_root_id")
def step_given_lifecycle_no_root(context: Context) -> None:
    plan = _make_mock_plan(
        phase=PlanPhase.EXECUTE,
        state=ProcessingState.QUEUED,
        decision_root_id=None,
    )
    context.lifecycle = _make_lifecycle(plan)
    context.plan_id = PLAN_ID


@when("I call guard_execute for the plan for coverage")
def step_call_guard_execute(context: Context) -> None:
    try:
        context.executor._guard_execute(context.plan_id)
        context.raised_exception = None
    except PlanError as exc:
        context.raised_exception = exc


@then("a PlanError should be raised about missing decision tree")
def step_check_no_decision_tree(context: Context) -> None:
    assert context.raised_exception is not None, "Expected a PlanError"
    assert isinstance(context.raised_exception, PlanError)
    assert "no decision tree" in str(context.raised_exception)


@given("a mock lifecycle with a plan in Strategize phase for guard coverage")
def step_given_lifecycle_strategize_for_guard(context: Context) -> None:
    plan = _make_mock_plan(
        phase=PlanPhase.STRATEGIZE,
        state=ProcessingState.QUEUED,
    )
    context.lifecycle = _make_lifecycle(plan)
    context.plan_id = PLAN_ID


@when("I call guard_execute expecting wrong phase for coverage")
def step_call_guard_execute_wrong_phase(context: Context) -> None:
    try:
        context.executor._guard_execute(context.plan_id)
        context.raised_exception = None
    except PlanError as exc:
        context.raised_exception = exc


@then("a PlanError should be raised about not in Execute phase")
def step_check_not_execute_phase(context: Context) -> None:
    assert context.raised_exception is not None, "Expected a PlanError"
    assert isinstance(context.raised_exception, PlanError)
    assert "not in Execute phase" in str(context.raised_exception)


@given("a mock lifecycle with an execute-phase plan in processing state for coverage")
def step_given_lifecycle_processing(context: Context) -> None:
    plan = _make_mock_plan(
        phase=PlanPhase.EXECUTE,
        state=ProcessingState.PROCESSING,
    )
    context.lifecycle = _make_lifecycle(plan)
    context.plan_id = PLAN_ID


@when("I call guard_execute expecting wrong state for coverage")
def step_call_guard_execute_wrong_state(context: Context) -> None:
    try:
        context.executor._guard_execute(context.plan_id)
        context.raised_exception = None
    except PlanError as exc:
        context.raised_exception = exc


@then("a PlanError should be raised about not queued")
def step_check_not_queued(context: Context) -> None:
    assert context.raised_exception is not None, "Expected a PlanError"
    assert isinstance(context.raised_exception, PlanError)
    assert "not queued" in str(context.raised_exception)


# ---------------------------------------------------------------------------
# PlanExecutor._run_execute_with_stub happy path
# ---------------------------------------------------------------------------


@given("a mock lifecycle with a fully configured execute-phase plan for coverage")
def step_given_lifecycle_full_execute(context: Context) -> None:
    plan = _make_mock_plan(
        phase=PlanPhase.EXECUTE,
        state=ProcessingState.QUEUED,
        definition_of_done="Implement feature\nWrite tests",
        decision_root_id="01HROOT000000000000000ROOT",
    )
    context.lifecycle = _make_lifecycle(plan)
    context.plan_id = PLAN_ID


@given("a PlanExecutor using that lifecycle without runtime for coverage")
def step_given_executor_no_runtime(context: Context) -> None:
    context.executor = PlanExecutor(
        lifecycle_service=context.lifecycle,
        execution_context=None,
    )


@when("I call run_execute on the PlanExecutor for coverage")
def step_run_execute(context: Context) -> None:
    context.execute_result = context.executor.run_execute(context.plan_id)


@then("the execute result should be returned successfully")
def step_check_execute_ok(context: Context) -> None:
    assert isinstance(context.execute_result, ExecuteResult)
    assert context.execute_result.changeset_id is not None


@then("the lifecycle should have called start_execute for coverage")
def step_check_start_execute(context: Context) -> None:
    context.lifecycle.start_execute.assert_called_once_with(context.plan_id)


@then("the lifecycle should have called complete_execute for coverage")
def step_check_complete_execute(context: Context) -> None:
    context.lifecycle.complete_execute.assert_called_once_with(context.plan_id)


# ---------------------------------------------------------------------------
# PlanExecutor._run_execute_with_stub exception path (lines 483, 490)
# ---------------------------------------------------------------------------


@given("a mock lifecycle with an execute-phase plan that will fail during stub execute")
def step_given_lifecycle_stub_fail(context: Context) -> None:
    plan = _make_mock_plan(
        phase=PlanPhase.EXECUTE,
        state=ProcessingState.QUEUED,
        definition_of_done="Something",
        decision_root_id="01HROOT000000000000000ROOT",
    )
    context.lifecycle = _make_lifecycle(plan)
    context.plan_id = PLAN_ID


@given("a PlanExecutor using that failing stub lifecycle for coverage")
def step_given_executor_failing_stub(context: Context) -> None:
    context.executor = PlanExecutor(
        lifecycle_service=context.lifecycle,
        execution_context=None,
    )
    # Patch the internal execute actor to raise
    context.executor._execute_actor = MagicMock()
    context.executor._execute_actor.execute.side_effect = RuntimeError(
        "Boom in execute"
    )


@when("I call run_execute expecting an exception from stub for coverage")
def step_run_execute_fail(context: Context) -> None:
    try:
        context.executor.run_execute(context.plan_id)
        context.raised_exception = None
    except RuntimeError as exc:
        context.raised_exception = exc


@then("the lifecycle should have called fail_execute for coverage")
def step_check_fail_execute(context: Context) -> None:
    assert context.raised_exception is not None, "Expected an exception"
    context.lifecycle.fail_execute.assert_called_once()
    call_args = context.lifecycle.fail_execute.call_args
    assert context.plan_id in call_args[0]
    assert "RuntimeError" in call_args[0][1]


# ---------------------------------------------------------------------------
# PlanExecutor.run_execute validation
# ---------------------------------------------------------------------------


@when("I call run_execute with an empty plan_id for coverage")
def step_run_execute_empty_plan_id(context: Context) -> None:
    try:
        context.executor.run_execute("")
        context.raised_exception = None
    except Exception as exc:
        context.raised_exception = exc


# ---------------------------------------------------------------------------
# PlanExecutor._build_decisions
# ---------------------------------------------------------------------------


@when("I call build_decisions for the plan for coverage")
def step_call_build_decisions(context: Context) -> None:
    plan = context.lifecycle.get_plan(context.plan_id)
    context.built_decisions = context.executor._build_decisions(plan)


@then("the decisions should match the plan definition of done steps")
def step_check_built_decisions(context: Context) -> None:
    decisions = context.built_decisions
    assert len(decisions) == 2
    assert decisions[0].step_text == "Implement feature"
    assert decisions[1].step_text == "Write tests"
    assert decisions[0].parent_id is None
    assert decisions[1].parent_id is not None