"""FC-6.2 — promote a post to a series + add a post as a chapter + browse list."""

import pytest

from backend.app.models import Artist, ImageRecord, Post, TagKind
from backend.app.services.series_service import SeriesService
from backend.app.services.tag_service import TagService

pytestmark = pytest.mark.integration

_SEQ = 0


async def _artist(db, name):
    a = Artist(name=name, slug=name.lower().replace(" ", "-"))
    db.add(a)
    await db.flush()
    return a


async def _post(db, artist, title, ext):
    p = Post(artist_id=artist.id, external_post_id=ext, post_title=title)
    db.add(p)
    await db.flush()
    return p


async def _post_images(db, post, artist, n):
    global _SEQ
    ids = []
    for _ in range(n):
        _SEQ += 1
        rec = ImageRecord(
            path=f"/tmp/fc_ps_{_SEQ}.png", sha256=f"{_SEQ:064d}",
            size_bytes=1, mime="image/png", origin="downloaded",
            primary_post_id=post.id, artist_id=artist.id,
        )
        db.add(rec)
        await db.flush()
        ids.append(rec.id)
    return ids


@pytest.mark.asyncio
async def test_promote_post_to_series(db):
    svc = SeriesService(db)
    artist = await _artist(db, "Bikupan")
    post = await _post(db, artist, "My Comic pages 1-3", "pp1")
    imgs = await _post_images(db, post, artist, 3)

    out = await svc.promote_post_to_series(post.id)
    assert out["added"] == 3
    assert out["name"] == "My Comic pages 1-3"

    data = await svc.list_pages(out["series_tag_id"])
    assert len(data["chapters"]) == 1
    ch = data["chapters"][0]
    assert ch["stated_page_start"] == 1
    assert ch["stated_page_end"] == 3
    assert [p["image_id"] for p in ch["pages"]] == imgs  # capture order
    assert [p["stated_page"] for p in ch["pages"]] == [1, 2, 3]


@pytest.mark.asyncio
async def test_promote_requires_images(db):
    svc = SeriesService(db)
    artist = await _artist(db, "Empty Artist")
    post = await _post(db, artist, "No images", "pp2")
    from backend.app.services.series_service import SeriesError
    with pytest.raises(SeriesError):
        await svc.promote_post_to_series(post.id)


@pytest.mark.asyncio
async def test_add_post_as_chapter_slots_by_stated_page(db):
    svc = SeriesService(db)
    artist = await _artist(db, "Story Artist")
    sid = (await TagService(db).find_or_create("Story", TagKind.series)).id
    # An existing chapter stating pages 9-12.
    await svc.create_chapter(sid, stated_page_start=9, stated_page_end=12)
    # A post stating pages 1-4 should slot BEFORE the 9-12 chapter.
    post = await _post(db, artist, "Story pages 1-4", "pp3")
    await _post_images(db, post, artist, 4)
    out = await svc.add_post_as_chapter(sid, post.id)
    assert out["added"] == 4

    data = await svc.list_pages(sid)
    chapters = data["chapters"]
    assert chapters[0]["stated_page_start"] == 1   # new one is first
    assert chapters[1]["stated_page_start"] == 9
    # gap 5-8 flagged between them
    assert data["gaps"][0]["start"] == 5
    assert data["gaps"][0]["end"] == 8


@pytest.mark.asyncio
async def test_list_series_cards(db):
    svc = SeriesService(db)
    artist = await _artist(db, "Card Artist")
    post = await _post(db, artist, "Card Comic pages 1-2", "pp4")
    await _post_images(db, post, artist, 2)
    out = await svc.promote_post_to_series(post.id)

    rows = await svc.list_series()
    card = next(r for r in rows if r["id"] == out["series_tag_id"])
    assert card["name"] == "Card Comic pages 1-2"
    assert card["chapter_count"] == 1
    assert card["page_count"] == 2
    assert card["artist_name"] == "Card Artist"
    assert card["cover_thumbnail_url"]
    assert card["has_gap"] is False

    # artist filter keeps it; a different artist id drops it.
    assert any(r["id"] == out["series_tag_id"] for r in await svc.list_series(artist_id=artist.id))
    assert all(r["id"] != out["series_tag_id"] for r in await svc.list_series(artist_id=artist.id + 99999))


# --- FC-6.4: stated_part, part_gaps, source_post label ---------------------


@pytest.mark.asyncio
async def test_update_chapter_sets_and_clears_stated_part(db):
    svc = SeriesService(db)
    sid = (await TagService(db).find_or_create("Part Series", TagKind.series)).id
    ch = await svc.create_chapter(sid)
    # Set the installment to Part 2 (chapter_number stays its positional value).
    await svc.update_chapter(sid, ch["id"], stated_part=2, set_part=True)
    data = await svc.list_pages(sid)
    assert data["chapters"][0]["stated_part"] == 2
    assert data["chapters"][0]["chapter_number"] == 1
    # Clearing it writes NULL back.
    await svc.update_chapter(sid, ch["id"], stated_part=None, set_part=True)
    data = await svc.list_pages(sid)
    assert data["chapters"][0]["stated_part"] is None


@pytest.mark.asyncio
async def test_part_gaps_flagged_from_stated_part(db):
    svc = SeriesService(db)
    sid = (await TagService(db).find_or_create("Gappy Series", TagKind.series)).id
    c1 = await svc.create_chapter(sid)
    c3 = await svc.create_chapter(sid)
    await svc.update_chapter(sid, c1["id"], stated_part=1, set_part=True)
    await svc.update_chapter(sid, c3["id"], stated_part=3, set_part=True)
    data = await svc.list_pages(sid)
    assert len(data["part_gaps"]) == 1
    gap = data["part_gaps"][0]
    assert gap["after_chapter_id"] == c1["id"]
    assert gap["start"] == 2
    assert gap["end"] == 2


@pytest.mark.asyncio
async def test_source_post_label_when_pages_share_one_post(db):
    svc = SeriesService(db)
    artist = await _artist(db, "Src Artist")
    post = await _post(db, artist, "Source Comic pages 1-2", "pp5")
    await _post_images(db, post, artist, 2)
    out = await svc.promote_post_to_series(post.id)
    data = await svc.list_pages(out["series_tag_id"])
    sp = data["chapters"][0]["source_post"]
    assert sp is not None
    assert sp["id"] == post.id
    assert sp["title"] == "Source Comic pages 1-2"