"""End-to-end tests with all fixture types (§28.5).

Each fixture represents a different document scenario and is run through
the full pipeline: raw → normalize → enrich → validate → ALTO + PAGE + viewer.
"""

from __future__ import annotations

import json
from typing import TYPE_CHECKING

from lxml import etree
from src.app.domain.models import CanonicalDocument, RawProviderPayload
from src.app.domain.models.geometry import GeometryContext
from src.app.domain.models.status import GeometryStatus
from src.app.enrichers import EnricherPipeline
from src.app.enrichers.bbox_repair_light import BboxRepairLightEnricher
from src.app.enrichers.hyphenation_basic import HyphenationBasicEnricher
from src.app.enrichers.lang_propagation import LangPropagationEnricher
from src.app.enrichers.reading_order_simple import ReadingOrderSimpleEnricher
from src.app.enrichers.text_consistency import TextConsistencyEnricher
from src.app.normalization.pipeline import normalize
from src.app.policies.document_policy import DocumentPolicy
from src.app.policies.export_policy import check_alto_export, check_page_export
from src.app.serializers.alto_xml import ALTO_NS, serialize_alto
from src.app.serializers.page_xml import PAGE_NS, serialize_page_xml
from src.app.validators.export_eligibility_validator import compute_export_eligibility
from src.app.validators.structural_validator import validate_structure
from src.app.viewer.projection_builder import build_projection

if TYPE_CHECKING:
    from pathlib import Path

GEO_CTX = GeometryContext(source_width=1000, source_height=800)

ENRICHER_PIPELINE = EnricherPipeline([
    BboxRepairLightEnricher(),
    LangPropagationEnricher(),
    ReadingOrderSimpleEnricher(),
    HyphenationBasicEnricher(),
    TextConsistencyEnricher(),
])


def _run_paddle_pipeline(fixture_name: str, fixtures_dir: Path) -> tuple[
    CanonicalDocument, bytes, bytes, dict
]:
    """Full pipeline for a PaddleOCR-format fixture."""
    with open(fixtures_dir / fixture_name) as f:
        payload = json.load(f)

    raw = RawProviderPayload(
        provider_id="paddleocr", adapter_id="v1", runtime_type="local",
        payload=payload, image_width=1000, image_height=800,
    )
    doc = normalize(raw, "word_box_json", GEO_CTX, document_id=f"test_{fixture_name}")
    doc = ENRICHER_PIPELINE.run(doc, DocumentPolicy())

    validate_structure(doc, bbox_tolerance=5.0)
    eligibility = compute_export_eligibility(doc)

    alto_bytes = serialize_alto(doc)
    page_bytes = serialize_page_xml(doc)
    vp = build_projection(doc, export_status=eligibility)

    return doc, alto_bytes, page_bytes, vp.model_dump(mode="json")


# -- Simple page (paddle_ocr_sample.json) ------------------------------------


class TestSimplePage:
    def test_full_pipeline(self, fixtures_dir: Path) -> None:
        doc, alto, page, viewer = _run_paddle_pipeline("paddle_ocr_sample.json", fixtures_dir)
        assert len(doc.pages[0].text_regions) >= 1
        assert b"Bonjour" in alto
        assert b"Bonjour" in page
        assert len(viewer["word_overlays"]) == 5

    def test_alto_valid_structure(self, fixtures_dir: Path) -> None:
        _, alto, _, _ = _run_paddle_pipeline("paddle_ocr_sample.json", fixtures_dir)
        root = etree.fromstring(alto)
        strings = root.findall(f".//{{{ALTO_NS}}}String")
        assert all(s.get("HPOS").isdigit() for s in strings)
        assert all(s.get("CONTENT") for s in strings)

    def test_page_has_reading_order(self, fixtures_dir: Path) -> None:
        _, _, page, _ = _run_paddle_pipeline("paddle_ocr_sample.json", fixtures_dir)
        root = etree.fromstring(page)
        refs = root.findall(f".//{{{PAGE_NS}}}RegionRefIndexed")
        assert len(refs) >= 1


# -- Double column -----------------------------------------------------------


class TestDoubleColumn:
    def test_four_items(self, fixtures_dir: Path) -> None:
        doc, _, _, _ = _run_paddle_pipeline("double_column.json", fixtures_dir)
        words = [w for r in doc.pages[0].text_regions for ln in r.lines for w in ln.words]
        assert len(words) == 4

    def test_reading_order_inferred(self, fixtures_dir: Path) -> None:
        doc, _, _, _ = _run_paddle_pipeline("double_column.json", fixtures_dir)
        assert doc.pages[0].reading_order  # enricher should have set it

    def test_dual_export(self, fixtures_dir: Path) -> None:
        _, alto, page, _ = _run_paddle_pipeline("double_column.json", fixtures_dir)
        alto_root = etree.fromstring(alto)
        page_root = etree.fromstring(page)
        assert len(alto_root.findall(f".//{{{ALTO_NS}}}String")) == 4
        assert len(page_root.findall(f".//{{{PAGE_NS}}}Word")) == 4


# -- Noisy page --------------------------------------------------------------


class TestNoisyPage:
    def test_handles_negative_coords(self, fixtures_dir: Path) -> None:
        doc, _, _, _ = _run_paddle_pipeline("noisy_page.json", fixtures_dir)
        # bbox_repair_light should clip negative coords
        for r in doc.pages[0].text_regions:
            for ln in r.lines:
                for w in ln.words:
                    x, y, _, _ = w.geometry.bbox
                    assert x >= 0
                    assert y >= 0

    def test_low_confidence_preserved(self, fixtures_dir: Path) -> None:
        doc, _, _, _ = _run_paddle_pipeline("noisy_page.json", fixtures_dir)
        words = [w for r in doc.pages[0].text_regions for ln in r.lines for w in ln.words]
        confs = [w.confidence for w in words if w.confidence is not None]
        assert any(c < 0.5 for c in confs)

    def test_structural_validation(self, fixtures_dir: Path) -> None:
        doc, _, _, _ = _run_paddle_pipeline("noisy_page.json", fixtures_dir)
        report = validate_structure(doc, bbox_tolerance=5.0)
        # After repair, structural issues should be minimized
        assert report.error_count == 0

    def test_viewer_has_all_words(self, fixtures_dir: Path) -> None:
        _, _, _, viewer = _run_paddle_pipeline("noisy_page.json", fixtures_dir)
        assert len(viewer["word_overlays"]) == 4


# -- Title + body ------------------------------------------------------------


class TestTitleBody:
    def test_four_items(self, fixtures_dir: Path) -> None:
        doc, _, _, _ = _run_paddle_pipeline("title_body.json", fixtures_dir)
        words = [w for r in doc.pages[0].text_regions for ln in r.lines for w in ln.words]
        assert len(words) == 4

    def test_alto_all_strings(self, fixtures_dir: Path) -> None:
        _, alto, _, _ = _run_paddle_pipeline("title_body.json", fixtures_dir)
        root = etree.fromstring(alto)
        strings = root.findall(f".//{{{ALTO_NS}}}String")
        assert any("Titre" in s.get("CONTENT", "") for s in strings)

    def test_page_all_words(self, fixtures_dir: Path) -> None:
        _, _, page, _ = _run_paddle_pipeline("title_body.json", fixtures_dir)
        root = etree.fromstring(page)
        words = root.findall(f".//{{{PAGE_NS}}}Word")
        assert len(words) == 4


# -- Hyphenation -------------------------------------------------------------


class TestHyphenationFixture:
    def test_hyphenation_detected(self, fixtures_dir: Path) -> None:
        doc, _, _, _ = _run_paddle_pipeline("hyphenation_sample.json", fixtures_dir)
        words = [w for r in doc.pages[0].text_regions for ln in r.lines for w in ln.words]
        hyph_words = [w for w in words if w.hyphenation is not None and w.hyphenation.is_hyphenated]
        assert len(hyph_words) == 2
        assert hyph_words[0].hyphenation.full_form == "patrimoine"
        assert hyph_words[0].hyphenation.part == 1
        assert hyph_words[1].hyphenation.part == 2

    def test_alto_hyphenation(self, fixtures_dir: Path) -> None:
        _, alto, _, _ = _run_paddle_pipeline("hyphenation_sample.json", fixtures_dir)
        root = etree.fromstring(alto)
        strings = root.findall(f".//{{{ALTO_NS}}}String")
        hyp_strings = [s for s in strings if s.get("SUBS_TYPE")]
        assert len(hyp_strings) == 2
        assert hyp_strings[0].get("SUBS_TYPE") == "HypPart1"
        assert hyp_strings[0].get("SUBS_CONTENT") == "patrimoine"


# -- Text only (no geometry) -------------------------------------------------


class TestTextOnlyFixture:
    def test_produces_document(self, fixtures_dir: Path) -> None:
        with open(fixtures_dir / "text_only_blocks.json") as f:
            payload = json.load(f)

        raw = RawProviderPayload(
            provider_id="qwen", adapter_id="v1", runtime_type="api",
            payload=payload, image_width=1000, image_height=800,
        )
        doc = normalize(raw, "text_only", GEO_CTX, document_id="text_test")

        assert len(doc.pages[0].text_regions) == 3

    def test_geometry_is_unknown(self, fixtures_dir: Path) -> None:
        with open(fixtures_dir / "text_only_blocks.json") as f:
            payload = json.load(f)

        raw = RawProviderPayload(
            provider_id="qwen", adapter_id="v1", runtime_type="api",
            payload=payload, image_width=1000, image_height=800,
        )
        doc = normalize(raw, "text_only", GEO_CTX, document_id="text_test")

        word = doc.pages[0].text_regions[0].lines[0].words[0]
        assert word.geometry.status == GeometryStatus.UNKNOWN

    def test_alto_refused(self, fixtures_dir: Path) -> None:
        with open(fixtures_dir / "text_only_blocks.json") as f:
            payload = json.load(f)

        raw = RawProviderPayload(
            provider_id="qwen", adapter_id="v1", runtime_type="api",
            payload=payload, image_width=1000, image_height=800,
        )
        doc = normalize(raw, "text_only", GEO_CTX, document_id="text_test")

        eligibility = compute_export_eligibility(doc)
        decision = check_alto_export(eligibility)
        assert decision.allowed is False

    def test_page_export_possible(self, fixtures_dir: Path) -> None:
        with open(fixtures_dir / "text_only_blocks.json") as f:
            payload = json.load(f)

        raw = RawProviderPayload(
            provider_id="qwen", adapter_id="v1", runtime_type="api",
            payload=payload, image_width=1000, image_height=800,
        )
        doc = normalize(raw, "text_only", GEO_CTX, document_id="text_test")

        eligibility = compute_export_eligibility(doc)
        # PAGE is more lenient — may still be exportable
        page_decision = check_page_export(eligibility)
        # Even if refused, it should give a clear reason
        assert page_decision.reason

    def test_viewer_renders_degraded(self, fixtures_dir: Path) -> None:
        with open(fixtures_dir / "text_only_blocks.json") as f:
            payload = json.load(f)

        raw = RawProviderPayload(
            provider_id="qwen", adapter_id="v1", runtime_type="api",
            payload=payload, image_width=1000, image_height=800,
        )
        doc = normalize(raw, "text_only", GEO_CTX, document_id="text_test")
        eligibility = compute_export_eligibility(doc)

        vp = build_projection(doc, export_status=eligibility)
        # Should still have overlays even with unknown geometry
        assert len(vp.word_overlays) > 0