"""Ende-zu-Ende: Kommandozeilenaufruf auf den Test-PDFs."""

import difflib
import re
import subprocess
import sys
import zipfile

import pytest

from conftest import ROOT, TITLE, needs_pandoc, needs_tesseract
from pdf2md import split_frontmatter

SCRIPT = ROOT / "pdf2md.py"


def run(*args, cwd=None) -> subprocess.CompletedProcess:
    done = subprocess.run(
        [sys.executable, str(SCRIPT), *map(str, args)],
        capture_output=True,
        text=True,
        timeout=600,
        cwd=cwd,
    )
    assert done.returncode == 0, done.stderr
    return done


def words(text: str) -> list[str]:
    return re.findall(r"[^\W\d_]+", text.lower())


@pytest.fixture(scope="module")
def digital_md(pdfs, tmp_path_factory):
    out = tmp_path_factory.mktemp("digital") / "digital.md"
    run(pdfs["digital"], out)
    return out.read_text(encoding="utf-8")


def test_digital_structure(digital_md):
    headings = re.findall(r"^#+ .*$", digital_md, re.MULTILINE)
    assert headings == [
        "# Das Testbuch",
        "## Inhaltsverzeichnis",
        "## Teil I: Der Anfang",
        "### 1 Der Notar",
        "### 2 Ein Brief",
    ]
    # Absatz über die Seitengrenze mit Silbentrennung
    assert "Dort sprach er lange mit dem Geheimdienst über die Lage" in digital_md
    # keine Seitenzahlen, keine Kolumnentitel außer der Titelüberschrift
    assert not re.search(r"^\d+$", digital_md, re.MULTILINE)
    meta, body = split_frontmatter(digital_md)
    assert meta["title"] == TITLE and meta["lang"] == "de"
    assert body.count(TITLE) == 1


@needs_tesseract
def test_scanned_matches_digital(pdfs, tmp_path, digital_md):
    out = tmp_path / "scanned.md"
    done = run(pdfs["scanned"], out, "--jobs", "2")
    assert "4 Seiten werden per OCR gelesen" in done.stdout
    md = out.read_text(encoding="utf-8")

    ratio = difflib.SequenceMatcher(None, words(digital_md), words(md), autojunk=False).ratio()
    assert ratio >= 0.9, ratio
    assert "Geheimdienst über die Lage" in md
    assert re.search(r"^#+ 1 Der Notar$", md, re.MULTILINE)
    assert re.search(r"^#+ 2 Ein Brief$", md, re.MULTILINE)
    assert not re.search(r"^\d+$", md, re.MULTILINE)


@needs_tesseract
def test_existing_ocr_layer_is_reused(pdfs, tmp_path, digital_md):
    out = tmp_path / "scanned_ocr.md"
    done = run(pdfs["scanned_ocr"], out)
    assert "4 mit OCR-Ebene" in done.stdout
    assert "0 Seiten werden per OCR gelesen" in done.stdout
    md = out.read_text(encoding="utf-8")
    ratio = difflib.SequenceMatcher(None, words(digital_md), words(md), autojunk=False).ratio()
    assert ratio >= 0.9, ratio


@needs_tesseract
def test_mixed_keeps_page_order(pdfs, tmp_path):
    out = tmp_path / "mixed.md"
    done = run(pdfs["mixed"], out)
    assert "2 Seiten werden per OCR gelesen" in done.stdout
    md = out.read_text(encoding="utf-8")
    positions = [md.find(s) for s in ("Albrecht van Oie", "Geheimdienst", "Teurer Albrecht", "nächsten Morgen")]
    assert -1 not in positions
    assert positions == sorted(positions)


@needs_tesseract
def test_photo_page_produces_no_garbage(pdfs, tmp_path, digital_md):
    out = tmp_path / "photo.md"
    done = run(pdfs["photo"], out)
    assert "0 Seiten werden per OCR gelesen" in done.stdout
    assert "Hinweis: 1 Bildseite" in done.stdout
    md = out.read_text(encoding="utf-8")
    assert words(md)[-5:] == words(digital_md)[-5:]


def test_no_ocr_on_scan_yields_hint(pdfs, tmp_path):
    out = tmp_path / "noocr.md"
    done = run(pdfs["scanned"], out, "--no-ocr")
    assert "Hinweis: 4 Bildseite(n)" in done.stdout
    assert "Albrecht" not in out.read_text(encoding="utf-8")


@needs_pandoc
def test_epub(pdfs, tmp_path):
    out = tmp_path / "buch.md"
    run(pdfs["digital"], out, "--epub")
    epub = tmp_path / "buch.epub"
    images = tmp_path / "buch_images"
    assert (images / "cover.jpg").is_file()
    assert {f.suffix for f in images.iterdir()} == {".jpg"}
    with zipfile.ZipFile(epub) as z:
        assert z.read("mimetype") == b"application/epub+zip"
        nav = z.read("EPUB/nav.xhtml").decode()
        opf = z.read("EPUB/content.opf").decode()
    for title in ("Teil I: Der Anfang", "1 Der Notar", "2 Ein Brief"):
        assert title in nav
    assert "Erika Muster" in opf
    assert "cover" in opf


def test_png_on_request(pdfs, tmp_path):
    out = tmp_path / "png.md"
    run(pdfs["digital"], out, "--images", "--image-format", "png")
    md = out.read_text(encoding="utf-8")
    assert re.search(r"!\[\]\(png_images/[^)]+\.png\)", md)


def test_image_links_relative_to_markdown_with_relative_output(pdfs, tmp_path):
    # Aufruf wie "python3 pdf2md.py --images buch.pdf Output/buch.md" aus dem Projektordner
    run(pdfs["digital"], "Output/buch.md", "--images", cwd=tmp_path)
    md = (tmp_path / "Output" / "buch.md").read_text(encoding="utf-8")
    links = re.findall(r"!\[\]\(([^)]+)\)", md)
    assert links
    for link in links:
        assert link.startswith("buch_images/"), link
        assert (tmp_path / "Output" / link).is_file()