"""Guard tests for block-level context inheritance + the routing tier lock.

These pin the *structural* contract of how multi-sentence note blocks route —
NOT the wording of any particular surveyor's notes. Surveyors pack several
sentences (and several elements) into one paragraph; only the first sentence of
a block usually carries the section label/code. The parser therefore:

* lets a sentence with no signal INHERIT the block's running section,
* lets a STRONG signal (explicit code / element label / high-confidence keyword)
  set or override that running section,
* keeps a WEAK general-keyword match from overriding an established section
  (so generic "repairs and repointing" boilerplate is not dragged to the walls),
* always files a HAZARD (I-group) mention in its own section without letting it
  hijack the surrounding element context.
"""

from __future__ import annotations

from backend.core.notes_keyword_router import (
    TIER_EXPLICIT,
    TIER_GENERAL,
    TIER_HIGH,
    TIER_LABEL,
    TIER_NONE,
    classify_note_cascade,
    classify_note_cascade_with_tier,
)
from backend.core.notes_parser import UNASSIGNED, parse_notes_to_sections
from backend.core.rics_canonical_l3 import build_canonical_template_schema


def _schema():
    return build_canonical_template_schema()


def _by_id(notes) -> dict[str, str]:
    return {n.section_id: n.text.lower() for n in notes}


# ── Routing tier contract (router level, schema-independent) ─────────────────


def test_tier_explicit_code():
    sid, tier, _ = classify_note_cascade_with_tier("F6, drainage chamber lifted.")
    assert (sid, tier) == ("F6", TIER_EXPLICIT)


def test_tier_element_label():
    sid, tier, _ = classify_note_cascade_with_tier("Main roof: slipped slates noted.")
    assert (sid, tier) == ("D2", TIER_LABEL)


def test_tier_high_confidence_keyword():
    sid, tier, _ = classify_note_cascade_with_tier("Ceilings show some deflection.")
    assert (sid, tier) == ("E2", TIER_HIGH)


def test_tier_none_for_nonsense():
    sid, tier, _ = classify_note_cascade_with_tier("xyzzy plugh frobnicator quux")
    assert (sid, tier) == (UNASSIGNED, TIER_NONE)


def test_cascade_backcompat_scores_unchanged():
    """The legacy (section, score, body) contract still scores 1.0 / 0.0."""
    assert classify_note_cascade("Ceilings show some deflection.")[1] == 1.0
    assert classify_note_cascade("xyzzy plugh frobnicator quux")[1] == 0.0


def test_bare_repointing_is_weak_but_wall_repointing_is_strong():
    """Unqualified repointing is ambiguous (weak); wall-qualified stays strong."""
    sid, tier, _ = classify_note_cascade_with_tier("Repairs and repointing are recommended.")
    assert (sid, tier) == ("D4", TIER_GENERAL)

    sid2, tier2, _ = classify_note_cascade_with_tier("Wall repointing is recommended.")
    assert (sid2, tier2) == ("D4", TIER_HIGH)


# ── Block-level context inheritance (parser level, canonical schema) ─────────


def test_signal_less_continuation_inherits_label_block():
    notes = parse_notes_to_sections(
        "Chimney stack: brick chimney generally sound. It should be monitored over time.",
        _schema(),
    )
    by_id = _by_id(notes)
    assert "monitored over time" in by_id.get("D1", "")


def test_weak_keyword_does_not_override_established_context():
    """The core fix: generic repointing inside a chimney block stays with D1."""
    notes = parse_notes_to_sections(
        "Chimney stack: brick chimney inspected. Repairs and repointing are recommended.",
        _schema(),
    )
    by_id = _by_id(notes)
    assert "repointing" in by_id.get("D1", "")
    assert "repointing" not in by_id.get("D4", "")


def test_strong_keyword_overrides_established_context():
    notes = parse_notes_to_sections(
        "Roof structure: trusses and purlins inspected from the loft. "
        "Ceilings throughout show some movement.",
        _schema(),
    )
    by_id = _by_id(notes)
    assert "trusses" in by_id.get("E1", "") or "purlins" in by_id.get("E1", "")
    assert "ceilings" in by_id.get("E2", "")


def test_explicit_code_mid_block_breaks_context():
    notes = parse_notes_to_sections(
        "E1 roof structure of traditional design with adequate support. "
        "E3 damp was noted to an internal partition wall.",
        _schema(),
    )
    by_id = _by_id(notes)
    assert "roof structure" in by_id.get("E1", "")
    assert "damp" in by_id.get("E3", "")


def test_weak_hazard_files_to_hazard_without_hijacking_context():
    """A weak (general-tier) hazard is filed to I3 but does not capture the
    block: the following signal-less sentence still inherits the element."""
    notes = parse_notes_to_sections(
        "Staircase: timber staircase inspected. The balustrade is a safety concern. "
        "Otherwise it remains secure.",
        _schema(),
    )
    by_id = _by_id(notes)
    assert "staircase" in by_id.get("E7", "")
    assert "balustrade" in by_id.get("I3", "")
    assert "remains secure" in by_id.get("E7", "")
    assert "balustrade" not in by_id.get("E7", "")


def test_block_start_weak_keyword_establishes_context():
    """When a block opens with only a weak keyword, it still sets the context so
    signal-less continuations are not lost to UNASSIGNED."""
    notes = parse_notes_to_sections(
        "Some repointing is needed. It should be carried out by a competent contractor.",
        _schema(),
    )
    by_id = _by_id(notes)
    assert "repointing" in by_id.get("D4", "")
    assert "competent contractor" in by_id.get("D4", "")


def test_paragraph_boundary_resets_context():
    notes = parse_notes_to_sections(
        "Chimney stack: brick chimney noted. Needs attention in due course.\n\n"
        "Windows: timber sash units. Some are painted shut.",
        _schema(),
    )
    by_id = _by_id(notes)
    assert "needs attention" in by_id.get("D1", "")
    assert "painted shut" in by_id.get("D5", "")
    assert "painted shut" not in by_id.get("D1", "")


def test_signal_less_block_with_no_context_stays_unassigned():
    notes = parse_notes_to_sections("Xyzzy plugh frobnicator quux.", _schema())
    assert any(n.section_id == UNASSIGNED for n in notes)