#!/usr/bin/env python3
"""
Characterization tests for tools/migrate_pages_to_content.py (U1).

Runs against the real detail pages in the repo, so it guards both the extractor
logic and the assumption that every current blog/news/event page is parseable.

Run directly:   python tools/tests/test_migrate_roundtrip.py
Or with pytest: pytest tools/tests/test_migrate_roundtrip.py
"""
import os
import sys
import unittest

TOOLS = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
ROOT = os.path.dirname(TOOLS)
sys.path.insert(0, TOOLS)

import yaml  # noqa: E402
import migrate_pages_to_content as mig  # noqa: E402


def _read(rel):
    with open(os.path.join(ROOT, rel), encoding="utf-8") as f:
        return f.read()


def _split_front_matter(text):
    """Return (metadata_dict, body_str) from front-matter file text."""
    assert text.startswith("---\n"), "file must start with a front-matter fence"
    _, front, body = text.split("---\n", 2)
    return yaml.safe_load(front), body


class BlogExtraction(unittest.TestCase):
    def setUp(self):
        slug = "how-to-open-slovenian-bank-account"
        html = _read(f"en/blog/{slug}/index.html")
        self.rec, self.err = mig.parse_page(html, "blog", slug, "en")

    def test_parses(self):
        self.assertIsNone(self.err)
        self.assertIsNotNone(self.rec)

    def test_structured_fields(self):
        self.assertEqual(self.rec["type"], "blog")
        self.assertEqual(self.rec["source_folder"], "blog")
        self.assertTrue(self.rec["title"])
        self.assertIn("subtitle", self.rec)
        self.assertEqual(self.rec["category"], "Student life")
        self.assertEqual(self.rec["date"], "2026-08-01")

    def test_hero(self):
        hero = self.rec["hero"]
        self.assertTrue(hero["src"].startswith("/images/"))
        self.assertTrue(hero["src"].endswith(".webp"))
        self.assertIn("alt", hero)

    def test_body_preserves_rich_elements(self):
        body = self.rec["_body"]
        self.assertEqual(self.rec["body_format"], "html")
        self.assertIn("guide-box", body)          # aside survives
        self.assertIn('id="why-useful"', body)     # h2 anchors survive (scrollspy source)
        self.assertTrue(body.lstrip().startswith('<div class="article-body">'))


class NewsExtraction(unittest.TestCase):
    def setUp(self):
        slug = "proof-of-means-updated-2026"
        html = _read(f"en/news/{slug}/index.html")
        self.rec, self.err = mig.parse_page(html, "news", slug, "en")

    def test_parses(self):
        self.assertIsNone(self.err)

    def test_news_has_no_subtitle(self):
        # News pages have no .article-subtitle; the field must be omitted, not empty.
        self.assertNotIn("subtitle", self.rec)
        self.assertEqual(self.rec["type"], "news")

    def test_hero_present(self):
        self.assertIn("hero", self.rec)


class EventExtraction(unittest.TestCase):
    def setUp(self):
        slug = "paint-and-wine-at-sunset"
        html = _read(f"en/projects/{slug}/index.html")
        self.rec, self.err = mig.parse_page(html, "projects", slug, "en")

    def test_type_and_folder_mapping(self):
        self.assertIsNone(self.err)
        self.assertEqual(self.rec["type"], "event")
        self.assertEqual(self.rec["source_folder"], "projects")  # URL/date key unchanged

    def test_gallery_and_lightbox_preserved(self):
        body = self.rec["_body"]
        self.assertIn("event-gallery", body)   # sibling section after .article-body
        self.assertIn("eg-thumb", body)         # lightbox thumbnails
        self.assertIn("data-full", body)


class CyrillicRoundTrip(unittest.TestCase):
    def test_mk_serialises_and_parses_without_mojibake(self):
        slug = "proof-of-means-updated-2026"
        html = _read(f"mk/news/{slug}/index.html")
        rec, err = mig.parse_page(html, "news", slug, "mk")
        self.assertIsNone(err)
        # Title is Macedonian Cyrillic.
        self.assertTrue(any("Ѐ" <= ch <= "ӿ" for ch in rec["title"]))
        text = mig.to_file_text(rec)
        meta, body = _split_front_matter(text)
        self.assertEqual(meta["title"], rec["title"])   # exact UTF-8 round-trip
        self.assertEqual(meta["lang"], "mk")
        self.assertTrue(body.strip())


class FrontMatterRoundTrip(unittest.TestCase):
    def test_metadata_survives_serialise_parse(self):
        slug = "how-to-open-slovenian-bank-account"
        html = _read(f"en/blog/{slug}/index.html")
        rec, _ = mig.parse_page(html, "blog", slug, "en")
        meta, _body = _split_front_matter(mig.to_file_text(rec))
        for key in ("type", "slug", "lang", "source_folder", "title", "date", "body_format"):
            self.assertEqual(meta[key], rec[key], f"{key} changed across round-trip")


class EveryPageParses(unittest.TestCase):
    def test_no_page_is_skipped(self):
        """Every current blog/news/event page must parse (a skip is a regression)."""
        en_cache = {}
        for lang, folder, slug, page in mig.iter_pages():
            if lang == "en":
                with open(page, encoding="utf-8") as f:
                    en_cache[(folder, slug)] = f.read()
        failures = []
        for lang, folder, slug, page in mig.iter_pages():
            with open(page, encoding="utf-8") as f:
                html = f.read()
            rec, err = mig.parse_page(html, folder, slug, lang,
                                      en_html=en_cache.get((folder, slug)))
            if rec is None:
                failures.append(f"{lang}/{folder}/{slug}: {err}")
        self.assertEqual(failures, [], f"unparseable pages: {failures}")


if __name__ == "__main__":
    unittest.main(verbosity=2)