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from __future__ import annotations

import argparse
import json

import pytest

from aegis.cli.app import main
from aegis.cli.commands.run import run_command
from aegis.runtime import AegisRuntime, EvaluationFailureError, RunOutcome


def _args(**kwargs: object) -> argparse.Namespace:
    defaults = {
        "task": "Review this repository",
        "agent": None,
        "workflow": None,
        "output": "text",
        "max_steps": None,
        "verbose": False,
    }
    defaults.update(kwargs)
    return argparse.Namespace(**defaults)


class SuccessfulRuntime:
    def __init__(self) -> None:
        self.calls: list[dict[str, object]] = []

    def run(
        self,
        *,
        task: str,
        agent_name: str | None = None,
        workflow_name: str | None = None,
        max_steps: int | None = None,
        run_id=None,
    ) -> RunOutcome:
        self.calls.append(
            {
                "task": task,
                "agent_name": agent_name,
                "workflow_name": workflow_name,
                "max_steps": max_steps,
                "run_id": run_id,
            }
        )
        return RunOutcome(
            run_id="run_123",
            status="completed",
            agent=agent_name or "default-task",
            workflow=workflow_name or "default",
            result={"summary": task},
            evaluation={"passed": True, "score": 100},
            error=None,
        )


class RaisingRuntime:
    def __init__(self, exc: BaseException) -> None:
        self._exc = exc

    def run(self, **kwargs: object) -> RunOutcome:
        raise self._exc


@pytest.mark.parametrize(
    "argv, expected",
    [
        (["run", "--help"], 0),
        (["run", "Review this repository"], 0),
    ],
)
def test_main_supports_help_and_execution(
    argv: list[str], expected: int, capsys: pytest.CaptureFixture[str]
) -> None:
    code = main(argv)
    captured = capsys.readouterr()
    assert code == expected
    if argv[-1] == "--help":
        assert "usage:" in captured.out.lower()
    else:
        assert "Run ID:" in captured.out


def test_run_command_success_with_text_output(capsys: pytest.CaptureFixture[str]) -> None:
    runtime = SuccessfulRuntime()

    code = run_command(_args(), runtime=runtime)

    captured = capsys.readouterr()
    assert code == 0
    assert "Run ID: run_123" in captured.out
    assert "Status: completed" in captured.out
    assert "Result:" in captured.out
    assert captured.err == ""
    assert runtime.calls[0]["run_id"] is not None
    assert str(runtime.calls[0]["run_id"]).startswith("run_") is False


def test_run_command_rejects_empty_task(capsys: pytest.CaptureFixture[str]) -> None:
    code = run_command(_args(task="   "), runtime=AegisRuntime())

    captured = capsys.readouterr()
    assert code == 2
    assert "Task cannot be empty" in captured.err
    assert "Traceback" not in captured.err


def test_run_command_unknown_agent(capsys: pytest.CaptureFixture[str]) -> None:
    code = run_command(_args(agent="missing"), runtime=AegisRuntime())

    captured = capsys.readouterr()
    assert code == 3
    assert "Unknown agent: missing" in captured.err
    assert "Traceback" not in captured.err


def test_run_command_unknown_workflow(capsys: pytest.CaptureFixture[str]) -> None:
    code = run_command(_args(workflow="missing"), runtime=AegisRuntime())

    captured = capsys.readouterr()
    assert code == 3
    assert "Unknown workflow: missing" in captured.err
    assert "Traceback" not in captured.err


def test_run_command_runtime_exception(capsys: pytest.CaptureFixture[str]) -> None:
    code = run_command(_args(), runtime=RaisingRuntime(RuntimeError("boom")))

    captured = capsys.readouterr()
    assert code == 1
    assert "Unexpected internal error." in captured.err
    assert "Traceback" not in captured.err


def test_run_command_evaluator_failure(capsys: pytest.CaptureFixture[str]) -> None:
    code = run_command(_args(), runtime=RaisingRuntime(EvaluationFailureError("evaluation failed")))

    captured = capsys.readouterr()
    assert code == 6
    assert "evaluation failed" in captured.err


def test_run_command_json_output_success(capsys: pytest.CaptureFixture[str]) -> None:
    runtime = SuccessfulRuntime()
    code = run_command(_args(output="json"), runtime=runtime)

    captured = capsys.readouterr()
    payload = json.loads(captured.out)
    assert code == 0
    assert payload["status"] == "completed"
    assert payload["agent"] == "default-task"
    assert payload["workflow"] == "default"
    assert payload["error"] is None


def test_run_command_json_output_failure(capsys: pytest.CaptureFixture[str]) -> None:
    code = run_command(_args(output="json", agent="missing"), runtime=AegisRuntime())

    captured = capsys.readouterr()
    payload = json.loads(captured.out)
    assert code == 3
    assert payload["status"] == "failed"
    assert payload["error"] == "Unknown agent: missing"
    assert payload["result"] is None


def test_run_command_max_steps_forwarded(capsys: pytest.CaptureFixture[str]) -> None:
    runtime = SuccessfulRuntime()
    code = run_command(_args(max_steps=10), runtime=runtime)

    capsys.readouterr()
    assert code == 0
    assert runtime.calls[0]["max_steps"] == 10


def test_run_command_verbose_failure_has_no_stack_trace_for_known_error(
    capsys: pytest.CaptureFixture[str]
) -> None:
    code = run_command(_args(verbose=True, agent="missing"), runtime=AegisRuntime())

    captured = capsys.readouterr()
    assert code == 3
    assert "Traceback" not in captured.err
    assert "Unknown agent: missing" in captured.err