"""Governance promotion flow: train → evaluate → request → approve."""

import shutil
from pathlib import Path

import pytest
from fastapi.testclient import TestClient

from forja_core.api import deps
from forja_core.main import create_app

FIXTURES = Path(__file__).parent.parent / "fixtures"


@pytest.fixture(autouse=True)
def patch_settings(tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> None:
    agents_dir = tmp_path / "agents"
    shutil.copytree(FIXTURES / "agents", agents_dir)
    monkeypatch.setenv("DATA_DIR", str(tmp_path))
    monkeypatch.setenv("AGENTS_DIR", str(agents_dir))
    monkeypatch.setenv("POLICIES_DIR", str(FIXTURES / "policies"))
    monkeypatch.setenv("DATASETS_DIR", str(FIXTURES / "datasets"))
    monkeypatch.setenv("MODELS_DIR", str(FIXTURES / "models"))
    monkeypatch.setenv("TRAINING_BACKEND", "mock")
    for fn in (
        deps.get_settings,
        deps.get_registry,
        deps.get_policy_store,
        deps.get_dataset_store,
        deps.get_model_store,
        deps.get_training_backend,
        deps.get_orchestrator,
        deps.get_llm_provider,
        deps.get_guardrail_engine,
    ):
        fn.cache_clear()


def test_promotion_flow_approve_activates_draft_version() -> None:
    client = TestClient(create_app())

    run = client.post(
        "/api/training/runs",
        json={
            "dataset_name": "incident_sft",
            "model_name": "gpt4o_lora_base",
            "agent_name": "test_agent",
            "agent_version": "v2",
        },
    ).json()
    run_id = run["id"]

    # Evaluation must cover the candidate version, not the active one.
    eval_report = client.post(f"/api/training/runs/{run_id}/evaluate").json()
    assert eval_report["passed"] is True
    assert eval_report["agent_version"] == "v2"

    promo = client.post(
        "/api/promotions",
        json={
            "agent_name": "test_agent",
            "agent_version": "v2",
            "training_run_id": run_id,
            "evaluation_report_id": eval_report["id"],
        },
    )
    assert promo.status_code == 201
    request_id = promo.json()["id"]

    approve = client.post(
        f"/api/promotions/{request_id}/approve",
        json={"approved_by": "ops-lead", "comment": "Eval gate passed"},
    )
    assert approve.status_code == 200

    agent = client.get("/api/agents/test_agent").json()
    assert agent["version"] == "v2"
    assert agent["state"] == "active"


def test_promotion_blocked_when_eval_failed(tmp_path: Path) -> None:
    """Promotion returns 422 if linked evaluation did not pass."""
    from datetime import UTC, datetime
    from uuid import uuid4

    from forja_core.api.evaluation_persistence import save_evaluation
    from forja_core.api.training_persistence import save_training_run
    from forja_core.domain.training import (
        EvaluationReport,
        TrainingHyperparameters,
        TrainingJobSpec,
        TrainingRun,
    )

    client = TestClient(create_app())
    settings = deps.get_settings()
    run_id = uuid4()
    now = datetime.now(UTC)
    spec = TrainingJobSpec(
        dataset_name="incident_sft",
        dataset_version="v1",
        model_name="gpt4o_lora_base",
        model_version="v1",
        agent_name="test_agent",
        hyperparameters=TrainingHyperparameters(),
    )
    save_training_run(
        settings.data_dir,
        TrainingRun(
            id=run_id,
            backend="mock",
            status="succeeded",
            spec=spec,
            external_job_id="mock:x",
            created_at=now,
            updated_at=now,
        ),
    )
    report = EvaluationReport(
        id=uuid4(),
        training_run_id=run_id,
        agent_name="test_agent",
        agent_version="v1",
        passed=False,
        scenario_count=1,
        violation_count=1,
        created_at=now,
        notes="forced failure",
    )
    save_evaluation(settings.data_dir, report)

    r = client.post(
        "/api/promotions",
        json={
            "agent_name": "test_agent",
            "agent_version": "v2",
            "training_run_id": str(run_id),
            "evaluation_report_id": str(report.id),
        },
    )
    assert r.status_code == 422


def test_promotion_blocked_when_eval_covers_other_version() -> None:
    """Evaluating the active version must not unlock promoting a different draft."""
    client = TestClient(create_app())

    # No agent_version on the run → evaluation covers the active version (v1).
    run = client.post(
        "/api/training/runs",
        json={
            "dataset_name": "incident_sft",
            "model_name": "gpt4o_lora_base",
            "agent_name": "test_agent",
        },
    ).json()
    run_id = run["id"]

    eval_report = client.post(f"/api/training/runs/{run_id}/evaluate").json()
    assert eval_report["passed"] is True
    assert eval_report["agent_version"] == "v1"

    r = client.post(
        "/api/promotions",
        json={
            "agent_name": "test_agent",
            "agent_version": "v2",
            "training_run_id": run_id,
            "evaluation_report_id": eval_report["id"],
        },
    )
    assert r.status_code == 422
    assert "evaluate the candidate version" in r.json()["detail"]