"""RAW output layer (Fase 2a, S2.1 · målbilde §3, R2): byte-deterministic outbox writers.

Two writers live here. ``write_run_config`` (S4.2, comparison protocol §4 pkt 3) persists the
run-config artefact ``{run_id}-runconfig.json`` — the resolved model-id per built role, profile,
params and token cap — describing a run WITHOUT a model call (the S4.2 dry-run drill + the M2 live
run). ``write_outbox`` persists the post-run proposal/outcome artefacts.

After a run, ``write_outbox`` persists two JSON artefacts — ``{run_id}-proposal.json`` (the candidate
IR + its provenance stamp) and ``{run_id}-outcome.json`` (the validated Monte-Carlo percentiles OR
the rejection reason, plus the checker verdict + the captured verdict id). This is the traceable
output layer Fase 5 (S5.1/S5.4) consumes; it is the OUTBOX, distinct from the async verdict INBOX
(``verdict_dir``) — a run must never write its outbox into a folder it also reads as an inbox
(that would bypass the Step-8 promotion gate; see ``run_project``'s docstring).

**MAF-free** (D7-portable): pure stdlib plus the MAF-free ``validator`` leaf for the outcome
``isinstance`` branch. ``ProvenanceStamp`` is imported ONLY under ``TYPE_CHECKING`` and serialized
duck-typed via ``.model_dump()`` — so importing this module never pulls in ``agent_framework``.
Registered in ``tests/test_okf.py``'s ``_MAF_FREE_MODULES`` and enforced by ``test_okf_is_maf_free``
(which proves no DIRECT ``agent_framework``/``mcp`` import — MAF-freedom otherwise holds by
construction, since only the MAF-free ``validator`` is imported at runtime).

Byte-determinism: ``json.dumps(payload, sort_keys=True, indent=2)`` + explicit trailing ``\\n`` +
UTF-8, and the caller supplies ``run_id`` (no wall-clock / uuid default) — so two runs with identical
input produce byte-identical files (diff-stable, mirrors ``verdicts.write_verdict`` /
``ledger.SavingsLedger.save``).

Deliberately NOT exported in ``portfolio_optimiser.__all__``: this is an internal wiring primitive
called by ``run_project``, not a public authoring API (contrast ``verdicts.write_verdict``).
"""

from __future__ import annotations

import json
from collections.abc import Mapping, Sequence
from pathlib import Path
from typing import TYPE_CHECKING, Any

from portfolio_optimiser.validator import Rejection, ValidatedProposal

if TYPE_CHECKING:  # provenance imports agent_framework — keep it out of the runtime import graph
    from portfolio_optimiser.provenance import ProvenanceStamp


def _dump(payload: dict[str, Any]) -> str:
    """Byte-deterministic on-disk form: sorted keys, 2-space indent, explicit trailing newline."""
    return json.dumps(payload, sort_keys=True, indent=2) + "\n"


def write_outbox(
    outbox_dir: str,
    run_id: str,
    *,
    outcome: ValidatedProposal | Rejection,
    provenance: ProvenanceStamp,
    checker_verdict: str | None,
    verdict_id: str,
    approach_id: str | None = None,
) -> tuple[Path, Path]:
    """Write ``{run_id}-proposal.json`` + ``{run_id}-outcome.json`` into ``outbox_dir`` (created if
    needed) and return their paths. The proposal file carries the candidate IR + provenance; the
    outcome file branches on the outcome type — a ``ValidatedProposal`` writes its percentiles, a
    ``Rejection`` writes its reason (and NO percentiles, mirroring the type distinction).

    ``approach_id`` (A5) names WHICH commissioned approach an artefact belongs to, so a run that
    evaluated several can have each of them judged rather than only the one it selected. It widens
    the file key to ``{run_id}-{approach_id}-*.json`` AND is written into the payload, because the
    reader (``hitl._read_outbox_proposals``) joins proposal to outcome on file CONTENT, never on the
    filename — a widened filename alone would still collapse three approaches onto one ``run_id``
    key. When it is ``None`` the key and the payload are exactly as before: the field is OMITTED
    rather than written as null, since these artefacts are byte-deterministic by contract and a run
    nobody commissioned has no approach to name."""
    directory = Path(outbox_dir)
    directory.mkdir(parents=True, exist_ok=True)

    stem = run_id if approach_id is None else f"{run_id}-{approach_id}"
    keys: dict[str, Any] = {"run_id": run_id}
    if approach_id is not None:
        keys["approach_id"] = approach_id

    proposal_path = directory / f"{stem}-proposal.json"
    proposal_path.write_text(
        _dump(
            {
                **keys,
                "proposal": outcome.proposal.model_dump(),
                "provenance": provenance.model_dump(),
            }
        ),
        encoding="utf-8",
    )

    outcome_path = directory / f"{stem}-outcome.json"
    outcome_path.write_text(
        _dump(
            {
                **keys,
                **outcome_payload(outcome, checker_verdict=checker_verdict, verdict_id=verdict_id),
            }
        ),
        encoding="utf-8",
    )

    return proposal_path, outcome_path


def outcome_payload(
    outcome: ValidatedProposal | Rejection,
    *,
    checker_verdict: str | None,
    verdict_id: str,
) -> dict[str, Any]:
    """The outcome artefact's payload minus the file keys — the ONE copy of the
    validated/rejected branching, shared by ``write_outbox`` and the hosted invocations
    response (``hosting._response_payload``). Two copies of the branch would drift, and a
    drifted copy would let the HTTP surface describe an outcome the outbox never wrote —
    the ``to_ore`` single-source rule (kø-(p)) applied to a payload shape."""
    if isinstance(outcome, ValidatedProposal):
        return {
            "outcome_type": "validated",
            "p10": outcome.p10,
            "p50": outcome.p50,
            "p90": outcome.p90,
            "nominal_feasible": outcome.nominal_feasible,
            "checker_verdict": checker_verdict,
            "verdict_id": verdict_id,
        }
    return {
        "outcome_type": "rejected",
        "reason": outcome.reason,
        "checker_verdict": checker_verdict,
        "verdict_id": verdict_id,
    }


def write_parse_failures(
    outbox_dir: str,
    run_id: str,
    *,
    failures: Sequence[Mapping[str, str]],
) -> Path:
    """Write ``{run_id}-parse-failures.json`` — the raw model replies that did NOT parse into the
    typed IR (Fase 1b, funn 1) — and return its path.

    **This is the only outbox artefact written from a ``finally``**, because it is the only one whose
    subject is a run that may never finish: the measured 1b failure exhausted the round ledger inside
    the generation loop and left ``run_project`` as a ``BudgetExceeded``, so the proposal/outcome
    writers below were never reached. An artefact that recorded parse failures only for runs that
    survived them would be silent for exactly the runs that need it.

    Takes plain mappings (the caller flattens ``generate.ParseFailure``), so this module stays
    MAF-free — ``generate`` imports ``agent_framework``, and importing it here would drag MAF into
    the RAW output layer.

    Byte-determinism is NOT claimed for this file, unlike its two neighbours: its content is a live
    model's prose, which is not reproducible by construction. It uses the same ``_dump`` form for
    consistency of reading, not to pin bytes. The caller writes it only when there is at least one
    failure, so the file's PRESENCE is itself the signal that something did not parse."""
    directory = Path(outbox_dir)
    directory.mkdir(parents=True, exist_ok=True)
    path = directory / f"{run_id}-parse-failures.json"
    path.write_text(
        _dump({"run_id": run_id, "parse_failures": [dict(f) for f in failures]}),
        encoding="utf-8",
    )
    return path


def write_exploration(
    outbox_dir: str,
    run_id: str,
    *,
    payload: Mapping[str, Any],
) -> Path:
    """Write ``{run_id}-exploration.json`` — what the U4 exploration did before the pipeline ran
    (§ C.2) — and return its path.

    Takes an already-rendered plain mapping (``explore.trace_payload``) for the reason
    ``write_parse_failures`` takes plain mappings: ``explore`` imports ``agent_framework``, and
    importing it here would drag MAF into the RAW output layer. The ONE renderer lives beside the
    dataclasses it renders; this writer only decides bytes and a filename.

    Byte-deterministic like its neighbours (the caller supplies ``run_id``; no wall-clock), and
    written even when the exploration RAISED — the caller writes it from a ``finally``, because a
    capped exploration is precisely the one whose per-round ledger a reader needs."""
    directory = Path(outbox_dir)
    directory.mkdir(parents=True, exist_ok=True)
    path = directory / f"{run_id}-exploration.json"
    path.write_text(_dump({"run_id": run_id, **dict(payload)}), encoding="utf-8")
    return path


def write_debate_tools(
    outbox_dir: str,
    run_id: str,
    *,
    tool_calls: Sequence[Mapping[str, Any]],
    requirements: Sequence[Mapping[str, Any]] = (),
) -> Path:
    """Write ``{run_id}-debate.json`` — WHICH documents the debate opened, in call order (S2c), and
    WHICH requirement it declared as binding (P19 DEL A).

    The sibling of ``write_exploration`` one phase over. Since S2c the debate navigates the
    knowledge base instead of being handed it whole, so "what did this run actually read" is a
    question about the debate too, and over a 630-concept corpus it is not answerable from a
    prompt log: the whole point is that the prompts no longer carry the base.

    Written on EVERY run that has an outbox, including one whose agents opened nothing — unlike
    ``write_parse_failures``, whose presence IS its signal. Here the empty case is the S2c
    regression itself (a debate that navigates nothing looks exactly like a cheap one), so it must
    be readable off the artefact rather than inferred from a file that is not there.

    Takes already-rendered plain mappings (``explore.tool_call_payload``) so the RAW output layer
    stays MAF-free — ``write_exploration``'s own rule, same reason."""
    directory = Path(outbox_dir)
    directory.mkdir(parents=True, exist_ok=True)
    path = directory / f"{run_id}-debate.json"
    path.write_text(
        _dump(
            {
                "run_id": run_id,
                "tool_calls": [dict(call) for call in tool_calls],
                # DEFAULTS to empty for the same reason ``Bundle.skipped`` does: "this debate
                # declared nothing" is an honest positive statement, and it is the one every run
                # written before today makes.
                "requirements": [dict(r) for r in requirements],
            }
        ),
        encoding="utf-8",
    )
    return path


def write_multibase(
    outbox_dir: str,
    run_id: str,
    *,
    runs: Sequence[Mapping[str, Any]],
    completed: bool,
    unreached: Sequence[Mapping[str, Any]],
    collisions: Sequence[Mapping[str, Any]],
    stopped_early: bool,
    budget_stop: Mapping[str, Any] | None,
) -> Path:
    """Write ``{run_id}-multibase.json`` — what ONE commission did across SEVERAL bases (P17b).

    The question no per-base artefact can answer. Each base writes its own full set under its own
    minted ``run_id``, but nothing in that set says in which ORDER the bases were spent, which id
    each one was given, which approaches were never reached, or which candidates two bases both
    described — and a reader who has to reconstruct the ``<run-id>-<bundle_id>`` convention to
    pair the files back to the pass has been handed a naming rule instead of a record.

    Written IFF the pass was given an outbox, exactly like its neighbours, and the per-base
    ``stop_reason`` rows are READ BACK from each base's own ``{run_id}-coverage.json`` by the
    caller rather than recomputed here: P19 D2 put that fact in that file, and a second derivation
    of it would be free to disagree with the one the judge reads.

    Plain data only, so the RAW output layer stays MAF-free (``write_debate_tools``' own rule)."""
    directory = Path(outbox_dir)
    directory.mkdir(parents=True, exist_ok=True)
    path = directory / f"{run_id}-multibase.json"
    path.write_text(
        _dump(
            {
                "run_id": run_id,
                # REQUIRED, never inferred from an empty ``unreached``: a pass a cap or a provider
                # cut short never got to say what it did not reach, and "nothing was left
                # unreached" must not be the value that means "we never found out"
                # (``ExplorationTrace.completed``'s own reason).
                "completed": completed,
                "runs": [dict(row) for row in runs],
                "unreached": [dict(row) for row in unreached],
                "collisions": [dict(row) for row in collisions],
                "stopped_early": stopped_early,
                "budget_stop": dict(budget_stop) if budget_stop is not None else None,
            }
        ),
        encoding="utf-8",
    )
    return path


def write_prepass(
    outbox_dir: str,
    run_id: str,
    *,
    declaration: Mapping[str, Any],
) -> Path:
    """Write ``{run_id}-prepass.json`` — the CUT this run was given (order 20260907T080223Z).

    Written IFF a payload was supplied, including when the cut withheld nothing —
    ``write_proposal_reviews``' rule, and here it does a second job. Since a payload WITHDRAWS the
    navigator tools, ``{run_id}-debate.json``'s ``tool_calls`` is empty by construction on this
    path; and that file is written unconditionally precisely because an empty trace IS the S2c
    regression (a debate that navigated nothing looks exactly like a cheap one). Without this
    artefact beside it, "withdrawn by design" and "regressed" would read identically. Its PRESENCE
    is what tells them apart.

    Takes an already-rendered plain mapping (``prepass.declaration_payload``) so the RAW output
    layer stays framework-free — ``write_exploration``'s rule, same reason."""
    directory = Path(outbox_dir)
    directory.mkdir(parents=True, exist_ok=True)
    path = directory / f"{run_id}-prepass.json"
    path.write_text(_dump({"run_id": run_id, "prepass": dict(declaration)}), encoding="utf-8")
    return path


def write_plan_review(
    outbox_dir: str,
    run_id: str,
    *,
    payload: Mapping[str, Any],
) -> Path:
    """Write ``{run_id}-plan-review.json`` — the open question of a PARKED exploration (U12) — and
    return its path.

    This is the outbox half of the asynchronous HITL door: the run writes the question, the expert
    writes the answer into a separate review INBOX, days later. The two folders are never the same
    one, for the reason the verdict inbox is never the outbox — a run that read its own output as
    input would be answering itself.

    Takes an already-rendered plain mapping (``explore.parked_payload``) for the reason
    ``write_exploration`` does: ``explore`` imports ``agent_framework`` and this layer stays
    MAF-free. Byte-deterministic like its neighbours.

    **Last write wins**, exactly one open question per run: a revision produces a NEW review of a
    REPLANNED plan, and leaving the superseded one on disk would let an expert answer a question
    the loop has already moved past. Staleness is caught anyway — the answer names the
    ``request_id`` it answers — but the file should not invite it."""
    directory = Path(outbox_dir)
    directory.mkdir(parents=True, exist_ok=True)
    path = directory / f"{run_id}-plan-review.json"
    path.write_text(_dump({"run_id": run_id, **dict(payload)}), encoding="utf-8")
    return path


def write_proposal_reviews(
    outbox_dir: str,
    run_id: str,
    *,
    payload: Mapping[str, Any],
) -> Path:
    """Write ``{run_id}-proposal-reviews.json`` — what a human answered about the proposals this
    run put on the table (MAJOR-2) — and return its path.

    Takes an already-rendered plain mapping (``proposal_review.proposal_reviews_payload``) for the
    reason ``write_plan_review`` does: the renderer lives in the module that owns the type, and
    this layer stays MAF-free. The writer prepends ``run_id`` exactly as its sibling does, so the
    on-disk object is ``{"reviews": [...], "run_id": ...}`` under ``_dump``'s sorted keys.

    **The write rule is: iff a reviewer was given, INCLUDING when the list is empty** (D4).
    Both halves are load-bearing and they pull in opposite directions. ``write_debate_tools``
    writes unconditionally because THERE the empty case is the regression; here a reviewer-LESS
    run must leave the outbox byte-identical, and two existing tests pin an exact four-name
    listing on such a run. But a reviewer that was offered and never consulted — no candidate ever
    validated — is a fact this artefact must be able to STATE, not something an operator has to
    infer from a missing file. "Iff a reviewer was given" is the only rule that keeps both."""
    directory = Path(outbox_dir)
    directory.mkdir(parents=True, exist_ok=True)
    path = directory / f"{run_id}-proposal-reviews.json"
    path.write_text(_dump({"run_id": run_id, **dict(payload)}), encoding="utf-8")
    return path


def write_coverage(
    outbox_dir: str,
    run_id: str,
    *,
    rows: Sequence[Mapping[str, Any]],
    stop_reason: str,
) -> Path:
    """Write ``{run_id}-coverage.json`` — WHY each commissioned approach ended as it did (P19 D2).

    ``settle`` prints the coverage report and ``ApproachOutcome`` has carried ``not_evaluated``
    since Trekk A3, but neither ever reached a FILE: measured 14.09, a judge reading an outbox could
    see that an approach had no artefact and could not tell a budget stop from an approach nobody
    ordered. That is the very silence ``ApproachOutcome`` exists to remove, one layer out.

    ``stop_reason`` is ``BudgetExceeded.kind`` when a cap cut the run short (``tokens`` /
    ``rounds`` / the portfolio's own kinds) and ``""`` when nothing did. A REQUIRED argument rather
    than an inferred one, for ``cost_baseline_anchored``'s reason: "the run finished" and "we never
    found out" must not be the same value.

    Byte-deterministic and wall-clock-free, mirroring ``write_run_config``; plain data only, so the
    RAW output layer stays MAF-free."""
    directory = Path(outbox_dir)
    directory.mkdir(parents=True, exist_ok=True)
    path = directory / f"{run_id}-coverage.json"
    path.write_text(
        _dump(
            {
                "run_id": run_id,
                "stop_reason": stop_reason,
                "rows": [dict(row) for row in rows],
            }
        ),
        encoding="utf-8",
    )
    return path


def write_run_config(
    config_dir: str,
    run_id: str,
    *,
    profile: str,
    resolved_models: dict[str, str],
    max_rounds: int,
    max_tokens: int,
    top_k: int,
) -> Path:
    """Write the byte-deterministic run-config artefact ``{run_id}-runconfig.json`` (S4.2, comparison
    protocol §4 pkt 3): the resolved model-id per *built* role, the profile, the round/token
    parameters and the token cap — everything that describes a run WITHOUT a model call. Takes plain
    data only (the caller resolves the models via ``resolve_model``), so this module stays MAF-free.
    NO wall-clock / date (that lives in the S11 report envelope, not the deterministic artefact), so
    two runs with identical config produce byte-identical files (mirrors ``write_outbox``)."""
    directory = Path(config_dir)
    directory.mkdir(parents=True, exist_ok=True)
    path = directory / f"{run_id}-runconfig.json"
    path.write_text(
        _dump(
            {
                "run_id": run_id,
                "profile": profile,
                "resolved_models": resolved_models,
                "max_rounds": max_rounds,
                "max_tokens": max_tokens,
                "top_k": top_k,
            }
        ),
        encoding="utf-8",
    )
    return path