"""S5.1 HITL — load-bearing detach seams (målbilde §3 / §7). Each test goes RED when the guarded
mechanism is removed; a bare happy-path pass would not catch the regression.

Seams pinned here:
- the outbox↔inbox **id-join** (a landed verdict must clear the queue);
- **causality control** (a pre-judged proposal is never listed);
- **inbox-predicate parity** with ``load_verdicts_from_dir`` (wrong decision + malformed features
  are skipped, so ``pending`` never counts as judged a file the real loader would drop);
- (Step 3) **route classification** detach;
- (Step 5) **transitive import-graph** MAF-freedom probe.
"""

from __future__ import annotations

import ast
import json
from pathlib import Path

from portfolio_optimiser.ir import AffectedItem, SavingsProposal
from portfolio_optimiser.outbox import write_outbox
from portfolio_optimiser.provenance import Citation, ProvenanceStamp
from portfolio_optimiser.retrieval import TextSpan
from portfolio_optimiser.validator import ValidatedProposal
from portfolio_optimiser.verdicts import ProposalFeatures, Verdict, write_verdict

from portfolio_optimiser import hitl

_PROVENANCE = ProvenanceStamp(
    citations=[Citation(file="f.md", locator=TextSpan(start_index=0, end_index=5), snippet="hi")],
    model="synthetic",
    role="proposer",
    validator_decision="validated",
    token_usage=8,
)


def _write_proposal(
    outbox: Path, run_id: str, *, verdict_id: str, codes: list[str] | None = None
) -> None:
    items = [AffectedItem(code=c, quantity=1000.0, unit_cost=1.0) for c in (codes or ["05.2"])]
    proposal = SavingsProposal(
        project_id="P1", measure="LED-retrofit", affected_items=items, claimed_saving_nok=200.0
    )
    write_outbox(
        str(outbox),
        run_id,
        outcome=ValidatedProposal(
            proposal=proposal, p10=100.0, p50=150.0, p90=200.0, nominal_feasible=180.0
        ),
        provenance=_PROVENANCE,
        checker_verdict="approve",
        verdict_id=verdict_id,
    )


def _write_raw_verdict(inbox: Path, verdict_id: str, payload: dict) -> None:
    """Hand-write an inbox ``{id}.json`` — used to construct decisions/shapes ``write_verdict``
    cannot emit (e.g. ``approved_with_adjustment``, or malformed features)."""
    inbox.mkdir(parents=True, exist_ok=True)
    (inbox / f"{verdict_id}.json").write_text(json.dumps(payload), encoding="utf-8")


# --- id-join (the flagship seam) ------------------------------------------------------------------


def test_verdict_landing_removes_from_pending(tmp_path: Path) -> None:
    """LOAD-BEARING: a proposal is pending until a verdict with the EXACT SAME id lands in the inbox.
    The id is the shared literal passed to ``write_outbox(verdict_id=X)`` and ``Verdict(id=X)`` — not
    a re-hash of features. Detach the ``verdict_id ∉ inbox id-set`` predicate (return all outbox
    proposals) → the landed verdict never clears the queue → RED."""
    outbox = tmp_path / "outbox"
    inbox = tmp_path / "inbox"
    _write_proposal(outbox, "run-1", verdict_id="SHARED-VID")

    assert [p.run_id for p in hitl.pending(str(outbox), str(inbox))] == ["run-1"]

    write_verdict(
        str(inbox),
        Verdict(
            id="SHARED-VID",
            proposal_features=ProposalFeatures(
                affected_codes=frozenset({"05.2"}),
                measure_type="scope_reduction",
                claimed_saving_nok=200.0,
            ),
            decision="approved",
            rationale="expert reviewed (test)",
        ),
    )

    assert hitl.pending(str(outbox), str(inbox)) == []


def test_pending_ignores_prejudged_proposal(tmp_path: Path) -> None:
    """CAUSALITY CONTROL: a proposal whose verdict is ALREADY in the inbox at first read is never
    listed — proving the removal above is caused by the id-join, not incidental."""
    outbox = tmp_path / "outbox"
    inbox = tmp_path / "inbox"
    _write_proposal(outbox, "run-1", verdict_id="SHARED-VID")
    write_verdict(
        str(inbox),
        Verdict(
            id="SHARED-VID",
            proposal_features=ProposalFeatures(
                affected_codes=frozenset({"05.2"}),
                measure_type="scope_reduction",
                claimed_saving_nok=200.0,
            ),
            decision="approved",
            rationale="expert reviewed (test)",
        ),
    )

    assert hitl.pending(str(outbox), str(inbox)) == []


# --- inbox-predicate parity with load_verdicts_from_dir -------------------------------------------


def test_inbox_idset_skips_wrong_decision(tmp_path: Path) -> None:
    """An otherwise-fully-valid inbox verdict (all required keys, well-formed proposal_features) whose
    ONLY defect is ``decision="approved_with_adjustment"`` (outside the binary run-path vocabulary)
    does NOT clear pending — parity with ``load_verdicts_from_dir`` skipping it. Being otherwise
    valid, dropping the decision filter is the ONLY reason it would skip → genuinely load-bearing."""
    outbox = tmp_path / "outbox"
    inbox = tmp_path / "inbox"
    _write_proposal(outbox, "run-1", verdict_id="SHARED-VID")
    _write_raw_verdict(
        inbox,
        "SHARED-VID",
        {
            "id": "SHARED-VID",
            "decision": "approved_with_adjustment",
            "rationale": "adjusted",
            "proposal_features": {
                "affected_codes": ["05.2"],
                "measure_type": "scope_reduction",
                "claimed_saving_nok": 200.0,
                "description": "",
            },
        },
    )

    assert [p.run_id for p in hitl.pending(str(outbox), str(inbox))] == ["run-1"]


# --- route classification (Step 3) ----------------------------------------------------------------


def test_route_classification_is_load_bearing(tmp_path: Path) -> None:
    """LOAD-BEARING: ``_matches`` genuinely classifies. Detach it (route everything to ``entries[0]``)
    → both assertions flip RED: an unmatched proposal would stop being UNROUTABLE, and a two-entry
    match would tie-break to ``entries[0]`` instead of the sorted-first id. ``entries[0]`` is
    deliberately NOT the sorted-first id, so the tie-break assertion is sensitive to the detach."""
    outbox = tmp_path / "outbox"
    inbox = tmp_path / "inbox"
    config = hitl.RoutingConfig(
        entries=[
            hitl.RoutingEntry(id="z-vei", allowed_code_prefixes=frozenset({"07"}), expert="Zeta"),
            hitl.RoutingEntry(
                id="a-energi", allowed_code_prefixes=frozenset({"05"}), expert="Alpha"
            ),
        ]
    )
    _write_proposal(outbox, "run-A", verdict_id="vA", codes=["99.9"])  # matches nothing
    _write_proposal(outbox, "run-C", verdict_id="vC", codes=["05.1", "07.1"])  # matches BOTH

    routed = {r.pending.run_id: r for r in hitl.route(str(outbox), str(inbox), config)}
    assert routed["run-A"].expert is None  # detach → routed to Zeta → RED
    assert routed["run-C"].ambiguous is True
    assert routed["run-C"].dimension_id == "a-energi"  # sorted-first, NOT entries[0] z-vei
    assert routed["run-C"].expert == "Alpha"


def test_inbox_idset_skips_malformed_features(tmp_path: Path) -> None:
    """An inbox verdict with all four top-level keys but ``proposal_features`` MISSING ``measure_type``
    (which ``verdict_from_dict`` reads → would raise) is skipped, so it does NOT clear pending —
    parity with the real loader dropping it."""
    outbox = tmp_path / "outbox"
    inbox = tmp_path / "inbox"
    _write_proposal(outbox, "run-1", verdict_id="SHARED-VID")
    _write_raw_verdict(
        inbox,
        "SHARED-VID",
        {
            "id": "SHARED-VID",
            "decision": "approved",
            "rationale": "ok",
            "proposal_features": {"affected_codes": ["05.2"], "claimed_saving_nok": 200.0},
        },
    )

    assert [p.run_id for p in hitl.pending(str(outbox), str(inbox))] == ["run-1"]


def test_inbox_idset_skips_non_iterable_affected_codes(tmp_path: Path) -> None:
    """PARITY (wrong-type): an inbox verdict with every required key present but ``affected_codes`` a
    NON-ITERABLE (``null``) is skipped — the real loader's ``frozenset(pf['affected_codes'])``
    (verdicts.py) raises ``TypeError`` and ``load_verdicts_from_dir`` drops it. So ``pending`` must NOT
    count it as judged; otherwise ``hitl`` marks the proposal judged while the learning pipeline still
    treats it pending — a silent false-negative in the operator queue, the exact failure the parity
    docstring says it prevents. Detach the ``affected_codes`` iterability check (accept on key-presence
    alone) → the file clears pending → RED. Ground-truth twin:
    ``test_verdicts.test_load_skips_non_iterable_affected_codes``."""
    outbox = tmp_path / "outbox"
    inbox = tmp_path / "inbox"
    _write_proposal(outbox, "run-1", verdict_id="SHARED-VID")
    _write_raw_verdict(
        inbox,
        "SHARED-VID",
        {
            "id": "SHARED-VID",
            "decision": "approved",
            "rationale": "ok",
            "proposal_features": {
                "affected_codes": None,  # non-iterable → real loader's frozenset() raises → skips
                "measure_type": "scope_reduction",
                "claimed_saving_nok": 200.0,
            },
        },
    )

    assert [p.run_id for p in hitl.pending(str(outbox), str(inbox))] == ["run-1"]


# --- transitive import-graph MAF-freedom probe (Step 5) -------------------------------------------

_SRC_DIR = Path(__file__).resolve().parents[1] / "src" / "portfolio_optimiser"
_MAF_ROOTS = {"agent_framework", "mcp"}


def _first_party_submodule_edges(tree: ast.Module) -> set[str]:
    """Collect ``portfolio_optimiser.<name>`` submodule import edges from a parsed module —
    ``from portfolio_optimiser.<name> import ...`` and ``import portfolio_optimiser.<name>``.

    DISCOUNTED by design (Assumption 3): the package top ``from portfolio_optimiser import X`` (X is
    a re-exported symbol from the eager ``__init__`` ``__all__`` set, e.g. ``run_project``), and
    ``__init__`` itself — never traversed, else every walk would reach ``run`` → ``agent_framework``
    and the probe would be unsatisfiable for a clean module. Known limitation: a hypothetical
    ``from portfolio_optimiser import verdicts`` (submodule via the package) is indistinguishable from
    a symbol import here and would be discounted — optional future hardening; the specced detach
    (``from portfolio_optimiser.verdicts import ...``) is a ``len>=2`` edge and IS caught."""
    edges: set[str] = set()
    for node in ast.walk(tree):
        if isinstance(node, ast.ImportFrom):
            parts = (node.module or "").split(".")
            if len(parts) >= 2 and parts[0] == "portfolio_optimiser" and parts[1] != "__init__":
                edges.add(parts[1])
        elif isinstance(node, ast.Import):
            for alias in node.names:
                parts = alias.name.split(".")
                if len(parts) >= 2 and parts[0] == "portfolio_optimiser" and parts[1] != "__init__":
                    edges.add(parts[1])
    return edges


def _imports_maf(tree: ast.Module) -> bool:
    for node in ast.walk(tree):
        if isinstance(node, ast.Import):
            if any(a.name.split(".")[0] in _MAF_ROOTS for a in node.names):
                return True
        elif isinstance(node, ast.ImportFrom):
            if (node.module or "").split(".")[0] in _MAF_ROOTS:
                return True
    return False


def test_hitl_transitive_import_graph_is_maf_free() -> None:
    """LOAD-BEARING: no module reachable from ``hitl.py``'s OWN first-party import edges imports
    ``agent_framework``/``mcp``. A static AST BFS (never traversing ``__init__.py`` — see the discount
    note) — NOT a ``sys.modules`` probe, which is unsatisfiable because ``__init__.py:11`` eagerly
    loads ``run`` → MAF. hitl re-implements the outbox shape + admits-logic inline, so its steady
    state is an EMPTY first-party edge set. Detach point (documented): add
    ``from portfolio_optimiser.verdicts import load_verdicts_from_dir`` to ``hitl.py`` → the walk
    reaches ``verdicts.py`` (``agent_framework`` at line 29) → RED. A clean hitl → GREEN."""
    seen: set[str] = set()
    queue = list(_first_party_submodule_edges(ast.parse((_SRC_DIR / "hitl.py").read_text("utf-8"))))
    maf_bearing: list[str] = []
    while queue:
        mod = queue.pop()
        if mod in seen:
            continue
        seen.add(mod)
        mod_file = _SRC_DIR / f"{mod}.py"
        if not mod_file.is_file():
            continue
        tree = ast.parse(mod_file.read_text("utf-8"))
        if _imports_maf(tree):
            maf_bearing.append(mod)
        queue.extend(_first_party_submodule_edges(tree) - seen)
    assert maf_bearing == [], (
        f"hitl's transitive first-party import graph reaches MAF-bearing module(s): {sorted(maf_bearing)}"
    )


def test_hitl_source_has_no_network_import() -> None:
    """hitl.py imports no network library (``socket``/``urllib``/``http``/``requests``/``httpx``) —
    the inspection tool reads local folders only, never egresses (målbilde §1 no-silent-egress)."""
    forbidden = {"socket", "urllib", "http", "requests", "httpx"}
    tree = ast.parse((_SRC_DIR / "hitl.py").read_text("utf-8"))
    imported: set[str] = set()
    for node in ast.walk(tree):
        if isinstance(node, ast.Import):
            imported |= {a.name.split(".")[0] for a in node.names}
        elif isinstance(node, ast.ImportFrom):
            imported.add((node.module or "").split(".")[0])
    assert imported & forbidden == set(), (
        f"hitl must not import network libs: {imported & forbidden}"
    )