"""Verification for the report post-processing pipeline (pure transform)."""

from __future__ import annotations

import re

import pytest

from backend.utils.report_postprocessor import (
    _jaccard_similarity,
    polish_report,
)

_RAW = (
    "[REDACTED_NAME_1] repairs tend to be expensive due to the associated "
    "scaffolding costs. SEE THE LIMITATIONS OF OUR INSPECTION ABOVE. MAIN ROOF:\n"
    "The main roof structure is of hipped pitch and [[REDACTED_NAME_2]] "
    "construction, partially extended to form\ndormers. The pitched roof covering "
    "appears to be of plain concrete tiles. However, some areas were concealed "
    "from view due to the loft\n2\nRICS Home Survey - Level 3\n26\nconversion. "
    "Condition Rating 2. Condition Rating 2."
)


def test_raises_on_empty():
    with pytest.raises(ValueError):
        polish_report("")
    with pytest.raises(ValueError):
        polish_report("   \n  ")


def test_pure_function_idempotent_on_clean_input():
    out1 = polish_report(_RAW)
    # Same input -> same output.
    assert polish_report(_RAW) == out1


def test_orphan_page_numbers_removed_globally():
    out = polish_report(_RAW)
    assert not re.search(r"(?m)^\s*\d{1,3}\s*$", out)
    assert "loft conversion" in out  # sentence rejoined across the page break


def test_repeated_doc_header_suppressed():
    out = polish_report(_RAW)
    assert "RICS Home Survey" not in out


def test_sentence_initial_placeholder_grammar():
    out = polish_report(_RAW)
    assert out.startswith("Repairs tend to be expensive")
    assert "REDACTED" not in out


def test_mid_sentence_placeholder_becomes_neutral():
    out = polish_report(_RAW)
    # Never the bare word "specified" — must be a visible, honest placeholder.
    assert "specified" not in out.lower()
    assert "[SURVEYOR TO CONFIRM] construction" in out
    assert "REDACTED" not in out


def test_all_caps_directive_scrubbed():
    out = polish_report(_RAW)
    assert "SEE THE LIMITATIONS" not in out.upper()


def test_consecutive_duplicate_short_sentence_collapsed():
    out = polish_report(_RAW)
    assert out.count("Condition Rating 2.") == 1


def test_non_adjacent_short_repeats_preserved():
    raw = (
        "The flashing is defective. Condition Rating 2. "
        "The gutter is blocked and overflowing at the rear. Condition Rating 2."
    )
    out = polish_report(raw)
    assert out.count("Condition Rating 2.") == 2


def test_near_duplicate_paragraph_collapsed():
    para = (
        "The mortar bedding and pointing to the ridge and hip tiles is "
        "deteriorating and repointing is required to prevent wind uplift damage."
    )
    raw = f"{para}\n\n{para}\n\nA distinct closing observation about the gutters."
    out = polish_report(raw)
    assert out.count("mortar bedding and pointing") == 1
    assert "closing observation about the gutters" in out


def test_caps_word_in_normal_sentence_not_stripped():
    raw = "Please see the limitations of our inspection in the relevant section."
    out = polish_report(raw)
    assert "limitations of our inspection" in out


def test_standalone_placeholder_line_removed():
    raw = "Roof inspected from ground level.\n[REDACTED_ADDRESS_1]\nNo defects noted."
    out = polish_report(raw)
    assert "REDACTED" not in out
    assert "Roof inspected from ground level." in out
    assert "No defects noted." in out


def test_extra_header_patterns_are_firm_agnostic():
    raw = "Roof comments here.\nACME SURVEYS LLP CONFIDENTIAL\nMore roof comments."
    out = polish_report(
        raw,
        extra_header_patterns=[re.compile(r"ACME SURVEYS LLP CONFIDENTIAL")],
    )
    assert "ACME SURVEYS" not in out


def test_unicode_normalisation():
    raw = "The roof\u2019s covering \u2013 slate \u2014 is sound\u00a0and intact."
    out = polish_report(raw)
    assert "\u2019" not in out and "\u2013" not in out and "\u2014" not in out
    assert "\u00a0" not in out


def test_jaccard_bounds():
    assert _jaccard_similarity("abcdef", "abcdef") == 1.0
    assert _jaccard_similarity("abcdef", "xyzuvw") == 0.0