"""Step 13 — end-to-end vertical-slice integration (deterministic, synthetic usage, no LLM).

Covers the six success criteria: (a) one valid proposal -> ValidatedProposal with populated
provenance (token usage > 0 from synthetic UsageDetails); (b) out-of-range -> Rejection with
reason; (c) Layer-2 verdict persisted; (d) a second structurally-similar run retrieves the
prior verdict via ExpeL (exercising two-arg extend_instructions); (e) tiny budget halts via
the meter/round-cap (cap not exceeded); (f) malformed contract raises before any chat call.
Pattern: tests/spikes/test_harness.py + test_c_validator.py + test_d_verdictstore.py.
"""

import pytest
from pydantic import ValidationError

from portfolio_optimiser.budget import BudgetExceeded
from portfolio_optimiser.run import run_project
from portfolio_optimiser.validator import Rejection, ValidatedProposal

_VALID = (
    '{"project_id":"FV42-GSV-E1","measure":"Reduce scope",'
    '"affected_items":[{"code":"05.2","quantity":4300,"unit_cost":215},'
    '{"code":"03.1","quantity":1800,"unit_cost":310}],"claimed_saving_nok":200000}'
)
_OUT_OF_RANGE = _VALID.replace("200000", "800000")  # parses fine, exceeds the ~445k P90

_VI = {"decision": "approved", "rationale": "feasible within range"}


async def test_a_valid_proposal_end_to_end(docs_dir, make_client_factory, fresh_store) -> None:
    result = await run_project(
        "FV42-GSV-E1", "local", docs_dir=docs_dir, verdict_input=_VI,
        client_factory=make_client_factory(_VALID), store=fresh_store,
    )
    assert isinstance(result.outcome, ValidatedProposal)
    stamp = result.provenance
    assert len(stamp.citations) >= 1 and stamp.model and stamp.role
    assert stamp.validator_decision == "validated"
    assert stamp.token_usage > 0  # sourced from the synthetic UsageDetails


async def test_b_out_of_range_is_rejected(docs_dir, make_client_factory, fresh_store) -> None:
    result = await run_project(
        "FV42-GSV-E1", "local", docs_dir=docs_dir,
        verdict_input={"decision": "rejected", "rationale": "claim too high"},
        client_factory=make_client_factory(_OUT_OF_RANGE), store=fresh_store,
    )
    assert isinstance(result.outcome, Rejection)
    assert result.outcome.reason


async def test_c_layer2_verdict_is_persisted(docs_dir, make_client_factory, fresh_store) -> None:
    result = await run_project(
        "FV42-GSV-E1", "local", docs_dir=docs_dir, verdict_input=_VI,
        client_factory=make_client_factory(_VALID), store=fresh_store,
    )
    assert any(v.id == result.verdict.id for v in result.store.verdicts)


async def test_d_second_run_retrieves_prior_verdict(
    docs_dir, make_client_factory, fresh_store
) -> None:
    factory = make_client_factory(_VALID)
    r1 = await run_project(
        "FV42-GSV-E1", "local", docs_dir=docs_dir, verdict_input=_VI,
        client_factory=factory, store=fresh_store,
    )
    r2 = await run_project(
        "FV42-GSV-E1", "local", docs_dir=docs_dir, verdict_input=_VI,
        client_factory=factory, store=fresh_store,
    )
    assert r2.retrieved  # ExpeL surfaced prior verdicts on the second run
    assert r2.retrieved[0].id == r1.verdict.id  # structurally identical -> stable id


async def test_e_tiny_budget_halts_without_exceeding(
    docs_dir, make_client_factory, fresh_store
) -> None:
    with pytest.raises(BudgetExceeded):
        await run_project(
            "FV42-GSV-E1", "local", docs_dir=docs_dir, verdict_input=_VI,
            client_factory=make_client_factory(_VALID, tokens=100),
            store=fresh_store, max_tokens=10,  # synthetic 100 tokens > cap 10 -> halt
        )


async def test_f_malformed_contract_raises_before_any_chat(
    docs_dir, make_client_factory
) -> None:
    calls = {"n": 0}
    base = make_client_factory(_VALID)

    def spy(role: str):
        calls["n"] += 1
        return base(role)

    with pytest.raises(ValidationError):
        await run_project(
            "FV42-GSV-E1", "local", docs_dir=docs_dir, verdict_input=_VI,
            client_factory=spy, top_k=0,  # malformed data-source contract
        )
    assert calls["n"] == 0  # validation fails before any chat client is touched