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"""Tests for ai_percent contract enforcement: assembly tier, verbatim
ratio target, deterministic stitcher, and prompt-stated slider value.
"""

from __future__ import annotations

from app.generator.postprocess import verbatim_overlap_ratio
from app.generator.prompts import (
    build_user_prompt,
    top_p_for_ai_involvement,
    verbatim_ratio_target,
)
from app.services.generation import _deterministic_assembly_stitch


class TestTopPCurveMonotonic:
    def test_assembly_is_tightest(self) -> None:
        assert top_p_for_ai_involvement(0) < top_p_for_ai_involvement(50)
        assert top_p_for_ai_involvement(0) < top_p_for_ai_involvement(100)

    def test_curve_is_monotonic(self) -> None:
        values = [top_p_for_ai_involvement(p) for p in (0, 12, 25, 37, 50, 67, 80, 100)]
        for earlier, later in zip(values, values[1:]):
            assert earlier <= later, f"top_p decreased from {earlier} to {later}"

    def test_assembly_below_one(self) -> None:
        assert top_p_for_ai_involvement(0) < 1.0
        assert top_p_for_ai_involvement(5) < 1.0


class TestVerbatimOverlapRatio:
    def test_full_quote_scores_high(self) -> None:
        src = "The property is a three-storey semi-detached house in fair condition."
        out = "The property is a three-storey semi-detached house in fair condition."
        assert verbatim_overlap_ratio(out, [src], n=6) == 1.0

    def test_paraphrase_scores_low(self) -> None:
        src = "The property is a three-storey semi-detached house in fair condition."
        out = "We observed a moderately maintained three-level semi-detached dwelling."
        assert verbatim_overlap_ratio(out, [src], n=6) < 0.2

    def test_empty_inputs_return_zero(self) -> None:
        assert verbatim_overlap_ratio("", ["any"], n=6) == 0.0
        assert verbatim_overlap_ratio("any text here please", [], n=6) == 0.0
        assert verbatim_overlap_ratio("short", ["short"], n=6) == 0.0

    def test_partial_quote_proportional(self) -> None:
        src = "The roof covering is in fair condition with no significant defects observed."
        out = "The roof covering is in fair condition. We also noticed loose tiles near the ridge."
        ratio = verbatim_overlap_ratio(out, [src], n=6)
        assert 0.0 < ratio < 1.0


class TestDeterministicStitcher:
    BOILERPLATE = (
        "The property comprises a traditionally constructed dwelling of brick and "
        "block cavity wall construction beneath a pitched and tiled roof. "
        "Inspection was carried out from ground level using a non-invasive visual approach."
    )

    def test_includes_source_wording_verbatim(self) -> None:
        out = _deterministic_assembly_stitch(
            skeleton="[A]: description.",
            bullets=["3 Acacia Avenue, postcode SW1A 1AA", "freehold, vacant"],
            paragraph_snippets=[self.BOILERPLATE],
            document_snippets=None,
            hierarchy_section_snippets=None,
            survey_level=3,
            redact_references=False,
        )
        assert "traditionally constructed dwelling" in out
        assert "non-invasive visual approach" in out

    def test_appends_bullet_notes(self) -> None:
        out = _deterministic_assembly_stitch(
            skeleton="[A]: description.",
            bullets=["3 Acacia Avenue, postcode XX1 1XX", "freehold, vacant"],
            paragraph_snippets=[self.BOILERPLATE],
            document_snippets=None,
            hierarchy_section_snippets=None,
            survey_level=3,
            redact_references=False,
        )
        assert "Site-specific observations" in out
        assert "Acacia Avenue" in out

    def test_redaction_strips_other_property_facts(self) -> None:
        ref_with_facts = (
            "The property at 25 Cunliffe Road, London SW4 8QE is a Victorian terrace. "
            "Inspection was carried out from ground level."
        )
        out = _deterministic_assembly_stitch(
            skeleton="[A]: description.",
            bullets=["different property notes"],
            paragraph_snippets=[ref_with_facts],
            document_snippets=None,
            hierarchy_section_snippets=None,
            survey_level=3,
            redact_references=True,
        )
        assert "SW4 8QE" not in out
        assert "Cunliffe Road" not in out
        assert "Inspection was carried out" in out

    def test_returns_empty_when_no_boilerplate(self) -> None:
        out = _deterministic_assembly_stitch(
            skeleton="[A]: description.",
            bullets=["only bullets here"],
            paragraph_snippets=None,
            document_snippets=None,
            hierarchy_section_snippets=None,
            survey_level=3,
        )
        assert out == ""

    def test_falls_back_to_document_snippets(self) -> None:
        out = _deterministic_assembly_stitch(
            skeleton="[A]: description.",
            bullets=["one bullet"],
            paragraph_snippets=None,
            document_snippets=[self.BOILERPLATE],
            hierarchy_section_snippets=None,
            survey_level=3,
            redact_references=False,
        )
        assert "traditionally constructed dwelling" in out

    def test_no_synthetic_advice_phrases(self) -> None:
        out = _deterministic_assembly_stitch(
            skeleton="[A]",
            bullets=["bullet text alpha"],
            paragraph_snippets=[self.BOILERPLATE],
            document_snippets=None,
            hierarchy_section_snippets=None,
            survey_level=3,
            redact_references=False,
        )
        synthetic_phrases = [
            "we recommend",
            "should be replaced",
            "in our professional opinion",
            "it is advisable",
        ]
        for phrase in synthetic_phrases:
            assert phrase not in out.lower(), f"synthetic phrase {phrase!r} leaked into stitcher output"


class TestVerbatimRatioTarget:
    def test_zero_percent_demands_full_verbatim(self) -> None:
        target, floor = verbatim_ratio_target(0)
        assert target == 1.0
        assert floor >= 0.9

    def test_full_ai_no_verbatim_floor(self) -> None:
        target, floor = verbatim_ratio_target(100)
        assert target == 0.0
        assert floor == 0.0

    def test_target_decreases_monotonically(self) -> None:
        targets = [verbatim_ratio_target(p)[0] for p in (0, 25, 50, 75, 100)]
        for earlier, later in zip(targets, targets[1:]):
            assert earlier >= later

    def test_floor_never_above_target(self) -> None:
        for p in (10, 25, 50, 75):
            target, floor = verbatim_ratio_target(p)
            assert 0.0 <= floor <= target


class TestPromptStatesSliderRatio:
    """The user-visible prompt MUST state the slider's target ratio so the
    LLM has a concrete number to hit (and so we can audit drift)."""

    def test_assembly_prompt_quotes_slider_value(self) -> None:
        prompt = build_user_prompt(
            skeleton="A",
            bullets=["alpha"],
            paragraph_snippets=["The property comprises a traditionally constructed dwelling."],
            ai_percent=0,
            survey_level=3,
            reference_only_context=True,
        )
        assert "0%" in prompt
        assert "verbatim" in prompt.lower()

    def test_low_tier_prompt_quotes_slider_value(self) -> None:
        prompt = build_user_prompt(
            skeleton="A",
            bullets=["alpha"],
            paragraph_snippets=["Inspection was carried out from ground level."],
            ai_percent=25,
            survey_level=3,
            reference_only_context=True,
        )
        assert "25%" in prompt
        assert "75%" in prompt

    def test_mid_tier_prompt_quotes_slider_value(self) -> None:
        prompt = build_user_prompt(
            skeleton="A",
            bullets=["alpha"],
            paragraph_snippets=["Inspection was carried out from ground level."],
            ai_percent=50,
            survey_level=3,
            reference_only_context=True,
        )
        assert "50%" in prompt