"""Portfolio run — LOAD-BEARING (K2; method-spec §3, §5, §8, §10, §11; paritetsrad 4).

The seam this file keeps alive: ``run_portfolio`` drives N projects SEQUENTIALLY
from a schema-validated reference config, composing each project's §5 context
(merge inbox → seed → fold) and running the loop core UNCHANGED per project,
collecting per-project results IN CONFIG ORDER. This is the run path MAF got in
its Fase 1 and D7 never had — the only prior run entrance (``run_s10.py``,
``run.py``) drives a single bundle.

Detach proofs (each restored from a copy, never ``git checkout``):

* Fail-fast (§10): drop the ``bundle_dir`` Field requirement in
  ``ReferenceProjectContract`` (e.g. ``bundle_dir: str = ""``) → a config missing
  its bundle path no longer raises at load → ``run_portfolio`` STARTS on the
  invalid config and only crashes mid-run → ``test_malformed_config_never_reaches
  _a_client`` goes red (``FileNotFoundError``, not ``ValidationError``).
* Re-entrancy (§3 Step 3, the key assumption): hoist the per-project
  ``compose_run_context`` call OUT of the loop (compose project 1 once, reuse it
  for every project) → project 2 runs on project 1's context → the VFD marker
  never reaches any prompt → ``test_each_project_composes_its_own_context`` goes red.
"""

from __future__ import annotations

import json
from pathlib import Path

import pytest
from pydantic import ValidationError

from _scripted import ScriptedClient, reply

from portfolio_optimiser_claude.budget import BudgetExceeded, BudgetMeter
from portfolio_optimiser_claude.contracts import (
    ReferenceProjectsContract,
    TerminationContract,
    load_reference_projects,
)
from portfolio_optimiser_claude.ir import load_validator_input
from portfolio_optimiser_claude.portfolio import PortfolioResult, run_portfolio
from portfolio_optimiser_claude.validator import ValidatedProposal

_REPO = Path(__file__).resolve().parents[1]
LED_BUNDLE = _REPO / "shared" / "examples" / "bygg-energi-mikro"
VFD_BUNDLE = _REPO / "tests" / "data" / "mini-bundle"

# Distinctive tokens that reach the composed context of ONE bundle only.
LED_MARKER = "LED-retrofit"  # in the shared bundle's rendered context
VFD_MARKER = "K2-VFD-CONTEXT-MARKER"  # embedded in the repo-local fixture's index


def _meter(*, max_rounds: int = 100, max_tokens: int = 10_000) -> BudgetMeter:
    return BudgetMeter(TerminationContract(max_rounds=max_rounds, max_tokens=max_tokens))


def _happy_replies(bundles: list[Path]) -> list[object]:
    """Three scripted replies per project: debate reasoning → APPROVE → candidate JSON.

    The candidate JSON is each bundle's own validated IR projection, so the
    deterministic validator returns ``ValidatedProposal`` first try (§3 Steps 2–4).
    """
    replies: list[object] = []
    for bundle in bundles:
        replies += [
            reply("debate reasoning"),
            reply("VERDICT: APPROVE"),
            reply(json.dumps(load_validator_input(bundle).model_dump())),
        ]
    return replies


def _config(entries: list[tuple[str, Path]]) -> ReferenceProjectsContract:
    return load_reference_projects(
        {"projects": [{"project_id": pid, "bundle_dir": str(path)} for pid, path in entries]}
    )


class TestSequentialConfigOrder:
    """Two-project config → both run, results collected in config order (§3, paritetsrad 4)."""

    def test_two_project_config_runs_both_in_config_order(self) -> None:
        projects = _config([("BYGG-KONTOR-NORD", LED_BUNDLE), ("PUMPE-SOR", VFD_BUNDLE)])
        client = ScriptedClient(replies=_happy_replies([LED_BUNDLE, VFD_BUNDLE]))
        result = run_portfolio(
            projects, client, _meter(), top_k=3, max_debate_rounds=3, max_attempts=3
        )
        assert isinstance(result, PortfolioResult)
        assert [r.project_id for r in result.results] == ["BYGG-KONTOR-NORD", "PUMPE-SOR"]
        assert all(isinstance(r.run.outcome, ValidatedProposal) for r in result.results)

    def test_result_order_follows_config_order_not_incidentally(self) -> None:
        # Reverse the config → the results reverse with it: order is the config's.
        projects = _config([("PUMPE-SOR", VFD_BUNDLE), ("BYGG-KONTOR-NORD", LED_BUNDLE)])
        client = ScriptedClient(replies=_happy_replies([VFD_BUNDLE, LED_BUNDLE]))
        result = run_portfolio(
            projects, client, _meter(), top_k=3, max_debate_rounds=3, max_attempts=3
        )
        assert [r.project_id for r in result.results] == ["PUMPE-SOR", "BYGG-KONTOR-NORD"]


class TestReEntrancy:
    """Key assumption (§3 Step 3): the loop core is re-entrant — fresh state per project.

    Two sequential runs share no mutable state beyond the explicitly shared meter:
    each project composes its OWN context, so the two projects' distinctive markers
    never appear together in a single prompt.
    """

    def test_each_project_composes_its_own_context(self) -> None:
        projects = _config([("BYGG-KONTOR-NORD", LED_BUNDLE), ("PUMPE-SOR", VFD_BUNDLE)])
        client = ScriptedClient(replies=_happy_replies([LED_BUNDLE, VFD_BUNDLE]))
        run_portfolio(projects, client, _meter(), top_k=3, max_debate_rounds=3, max_attempts=3)

        proposer_prompts = client.prompts("proposer")
        led = [p for p in proposer_prompts if LED_MARKER in p]
        vfd = [p for p in proposer_prompts if VFD_MARKER in p]
        assert led, "project 1's own context must reach its prompts"
        assert vfd, "project 2's own context must reach its prompts (no reuse of project 1's)"
        # No single prompt ever mixes the two projects' contexts.
        assert not any(LED_MARKER in p and VFD_MARKER in p for p in proposer_prompts)


class TestFailurePolicyRaise:
    """Failure policy is a stack-local choice until D-D: the default RAISES (§8).

    Today everything is thrown; K18 flips this to collect-and-continue when the
    D-D wave model lands. A budget stop in project 1 propagates as the typed
    ``BudgetExceeded`` and the portfolio stops — project 2 is never touched.
    """

    def test_project_error_propagates_and_stops_the_portfolio(self) -> None:
        projects = _config([("BYGG-KONTOR-NORD", LED_BUNDLE), ("PUMPE-SOR", VFD_BUNDLE)])
        client = ScriptedClient(replies=_happy_replies([LED_BUNDLE, VFD_BUNDLE]))
        # max_tokens=5: project 1's first proposer reply (10 tokens) breaches the cap.
        meter = _meter(max_tokens=5)
        with pytest.raises(BudgetExceeded):
            run_portfolio(projects, client, meter, top_k=3, max_debate_rounds=3, max_attempts=3)
        # The stop fired inside project 1's first call; project 2 never ran.
        assert len(client.calls) == 1
        assert not any(VFD_MARKER in prompt for _role, prompt in client.calls)


class TestFailFastSchemaValidation:
    """§10: a malformed config is refused at load, BEFORE any model client is touched."""

    def test_malformed_config_never_reaches_a_client(self) -> None:
        spy = ScriptedClient(replies=[reply("must never be used")])
        with pytest.raises(ValidationError):
            projects = load_reference_projects({"projects": [{"project_id": "NO-BUNDLE"}]})
            run_portfolio(projects, spy, _meter(), top_k=3, max_debate_rounds=3, max_attempts=3)
        assert spy.calls == []