"""FC-6.x — promote a post to a series + add a post's pages + browse list."""

import pytest
from sqlalchemy import select

from backend.app.models import Artist, ImageRecord, Post, TagKind
from backend.app.models.series_page import SeriesPage
from backend.app.services.series_service import SeriesError, 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"])
    # one flat run in capture order, no dividers, stated pages parsed 1..3
    assert [p["image_id"] for p in data["pages"]] == imgs
    assert [p["stated_page"] for p in data["pages"]] == [1, 2, 3]
    assert data["dividers"] == []


@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")
    with pytest.raises(SeriesError):
        await svc.promote_post_to_series(post.id)


@pytest.mark.asyncio
async def test_add_post_stages_pending(db):
    svc = SeriesService(db)
    artist = await _artist(db, "Story Artist")
    sid = (await TagService(db).find_or_create("Story", TagKind.series)).id
    # Seed the series with two PLACED pages.
    seed_post = await _post(db, artist, "seed", "pp3a")
    seed = await _post_images(db, seed_post, artist, 2)
    await svc.add_images(sid, seed)
    # A later post is STAGED as pending — not in the placed run yet.
    post = await _post(db, artist, "Story pages 9-11", "pp3b")
    imgs = await _post_images(db, post, artist, 3)
    out = await svc.add_post(sid, post.id)
    assert out["staged"] == 3

    data = await svc.list_pages(sid)
    # placed run unchanged (just the seed); pending grouped under the post.
    assert [p["image_id"] for p in data["pages"]] == seed
    assert len(data["pending"]) == 1
    grp = data["pending"][0]
    assert grp["post"]["id"] == post.id
    assert grp["post"]["title"] == "Story pages 9-11"
    assert [pg["image_id"] for pg in grp["pages"]] == imgs
    # add_post stamps the post's parsed START (9) on every staged page; the
    # group surfaces it as start_page (the default for "Place from page N").
    assert grp["start_page"] == 9


@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"] == 0  # a flat promote has no dividers
    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)
    )


@pytest.mark.asyncio
async def test_source_post_label_is_per_page(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["pages"][0]["source_post"]
    assert sp is not None
    assert sp["id"] == post.id
    assert sp["title"] == "Source Comic pages 1-2"