"""Evidence review must stay usable on a regional run.

evidence_geojson emitted one feature per false positive, one per false
negative and *two* per match, with no limit. A regional QA run of 40k
detections against 45k reference footprints produced well over a hundred
thousand features in a single response, plus one warning string per
unresolvable identifier. The endpoint the whole review workflow depends on
therefore stopped working exactly where review matters most.

The budget goes to what a reviewer must act on — misses and false positives —
before confirmations, and the response says what it left out.
"""

from __future__ import annotations

from app.services.quality_evidence_service import QualityEvidenceService


def _features(role: str, count: int) -> list[dict]:
    return [{"properties": {"evidence_role": role}, "id": f"{role}-{index}"} for index in range(count)]


def test_missing_identifiers_collapse_into_one_statement() -> None:
    warnings = QualityEvidenceService.summarize_missing(
        candidate_ids=["a", "b", "c"],
        reference_ids=["r1"],
    )

    assert len(warnings) == 1
    assert "3" in warnings[0]
    assert "1" in warnings[0]


def test_nothing_missing_produces_no_warning() -> None:
    assert QualityEvidenceService.summarize_missing(candidate_ids=[], reference_ids=[]) == []


def test_the_plan_is_capped_before_any_geometry_is_fetched() -> None:
    """Resolving 130k geometries to draw 5k of them is work for nothing."""

    findings = {
        "match_evidence": [{"candidate_feature_id": f"c{i}", "reference_feature_id": f"r{i}"} for i in range(100)],
        "false_positive_evidence": [{"candidate_feature_id": f"fp{i}"} for i in range(10)],
        "false_negative_evidence": [{"reference_feature_id": f"fn{i}"} for i in range(10)],
    }

    plan = QualityEvidenceService.plan_evidence(findings, limit=8)

    assert plan.truncated is True
    assert len(plan.items) == 8
    # Both error classes are represented; confirmations do not get a share
    # while errors are still waiting.
    assert {item.role for item in plan.items} == {"false_negative", "false_positive"}
    # Only the identifiers that will actually be drawn need resolving.
    assert len(plan.candidate_ids) + len(plan.reference_ids) == 8
    assert plan.candidate_ids <= {f"fp{i}" for i in range(10)}
    assert plan.reference_ids <= {f"fn{i}" for i in range(10)}


def test_a_rare_error_class_is_never_crowded_out() -> None:
    """50.000 misses must not hide the three false positives."""

    findings = {
        "false_negative_evidence": [{"reference_feature_id": f"fn{i}"} for i in range(5_000)],
        "false_positive_evidence": [{"candidate_feature_id": f"fp{i}"} for i in range(3)],
    }

    plan = QualityEvidenceService.plan_evidence(findings, limit=100)

    roles = [item.role for item in plan.items]
    assert roles.count("false_positive") >= 1
    assert roles.count("false_negative") >= 90
    assert len(plan.items) == 100


def test_the_plan_reports_the_complete_population_not_the_capped_one() -> None:
    findings = {
        "match_evidence": [{"candidate_feature_id": f"c{i}", "reference_feature_id": f"r{i}"} for i in range(100)],
        "false_negative_evidence": [{"reference_feature_id": "fn"}],
    }

    plan = QualityEvidenceService.plan_evidence(findings, limit=2)

    assert plan.total_feature_count == 201
    assert plan.role_counts == {"match_candidate": 100, "match_reference": 100, "false_negative": 1}


def test_an_uncapped_plan_keeps_everything() -> None:
    findings = {"false_negative_evidence": [{"reference_feature_id": f"fn{i}"} for i in range(30)]}

    plan = QualityEvidenceService.plan_evidence(findings, limit=0)

    assert plan.truncated is False
    assert len(plan.items) == 30
    assert plan.reference_ids == {f"fn{i}" for i in range(30)}


def test_evidence_without_identifiers_is_skipped_not_planned() -> None:
    findings = {
        "false_positive_evidence": [{"candidate_feature_id": None}, {"candidate_feature_id": "fp"}],
        "false_negative_evidence": [{}],
    }

    plan = QualityEvidenceService.plan_evidence(findings, limit=0)

    assert [item.role for item in plan.items] == ["false_positive"]
    assert plan.candidate_ids == {"fp"}



def test_a_planned_match_keeps_its_candidate_and_reference_together() -> None:
    """Half a match is not reviewable evidence."""

    findings = {
        "match_evidence": [
            {"candidate_feature_id": "c1", "reference_feature_id": "r1"},
            {"candidate_feature_id": "c2", "reference_feature_id": "r2"},
        ]
    }

    plan = QualityEvidenceService.plan_evidence(findings, limit=3)

    assert plan.truncated is True
    # An odd budget drops the second pair rather than showing one side of it.
    assert len(plan.items) == 1
    assert plan.candidate_ids == {"c1"}
    assert plan.reference_ids == {"r1"}