"""FC-3k: /api/admin/* endpoint integration tests.

Monkeypatch `.delay()` for Tier-C tasks to capture dispatch payloads
without actually queuing. Tier-B/A endpoints run synchronously
through the real service.
"""
import hashlib

import pytest

from backend.app import create_app
from backend.app.models import Artist, ImageRecord, Tag, TagKind
from backend.app.models.tag import image_tag

pytestmark = pytest.mark.integration


@pytest.fixture
async def app():
    return create_app()


@pytest.fixture
async def client(app):
    async with app.test_client() as c:
        yield c


# --- Tier-C: POST /artists/<slug>/cascade-delete --------------------


@pytest.mark.asyncio
async def test_artist_cascade_dry_run_returns_projection(client, db):
    a = Artist(name="Aria", slug="aria")
    db.add(a)
    await db.commit()

    resp = await client.post(
        "/api/admin/artists/aria/cascade-delete",
        json={"dry_run": True},
    )
    assert resp.status_code == 200
    body = await resp.get_json()
    assert body["artist"]["slug"] == "aria"
    assert "projected" in body
    assert body["projected"]["images"] == 0


@pytest.mark.asyncio
async def test_artist_cascade_unknown_slug_404(client):
    resp = await client.post(
        "/api/admin/artists/no-such/cascade-delete",
        json={"dry_run": True},
    )
    assert resp.status_code == 404


@pytest.mark.asyncio
async def test_artist_cascade_wrong_confirm_400(client, db):
    a = Artist(name="Aria", slug="aria")
    db.add(a)
    await db.commit()
    artist_id = a.id

    resp = await client.post(
        "/api/admin/artists/aria/cascade-delete",
        json={"dry_run": False, "confirm": "wrong"},
    )
    assert resp.status_code == 400
    body = await resp.get_json()
    assert body["error"] == "confirm_mismatch"
    assert body["expected"] == f"delete-artist-{artist_id}"


@pytest.mark.asyncio
async def test_artist_cascade_correct_confirm_dispatches(
    client, db, monkeypatch,
):
    a = Artist(name="Aria", slug="aria")
    db.add(a)
    await db.commit()
    artist_id = a.id

    dispatched = []

    class _Result:
        id = "fake-task-id"

    def _delay(**kw):
        dispatched.append(kw)
        return _Result()

    monkeypatch.setattr(
        "backend.app.tasks.admin.delete_artist_cascade_task.delay", _delay,
    )

    resp = await client.post(
        "/api/admin/artists/aria/cascade-delete",
        json={
            "dry_run": False,
            "confirm": f"delete-artist-{artist_id}",
        },
    )
    assert resp.status_code == 202
    body = await resp.get_json()
    assert body["task_id"] == "fake-task-id"
    assert dispatched == [{"artist_id": artist_id}]


# --- Tier-C: POST /images/bulk-delete -------------------------------


@pytest.mark.asyncio
async def test_bulk_delete_dry_run_returns_counts(client, db, tmp_path):
    a = Artist(name="B", slug="b")
    db.add(a)
    await db.flush()
    i1 = ImageRecord(
        artist_id=a.id, path=str(tmp_path / "1.jpg"),
        sha256="1" * 64, size_bytes=10, mime="image/jpeg",
        origin="imported_filesystem",
    )
    i2 = ImageRecord(
        artist_id=a.id, path=str(tmp_path / "2.jpg"),
        sha256="2" * 64, size_bytes=20, mime="image/jpeg",
        origin="imported_filesystem",
    )
    db.add_all([i1, i2])
    await db.commit()

    resp = await client.post(
        "/api/admin/images/bulk-delete",
        json={
            "image_ids": [i1.id, i2.id, 9_999_999],
            "dry_run": True,
        },
    )
    assert resp.status_code == 200
    body = await resp.get_json()
    assert body["images_found"] == 2
    assert body["bytes_on_disk"] == 30
    assert body["missing_ids"] == [9_999_999]
    # Dry-run hands the canonical Tier-C confirm token back so the
    # frontend doesn't recompute SHA-256 client-side (crypto.subtle
    # is Secure-Context-gated; FC runs over plain HTTP).
    assert body["confirm_token"].startswith("delete-images-")
    assert len(body["confirm_token"]) == len("delete-images-") + 8


@pytest.mark.asyncio
async def test_bulk_delete_empty_list_400(client):
    resp = await client.post(
        "/api/admin/images/bulk-delete",
        json={"image_ids": [], "dry_run": True},
    )
    assert resp.status_code == 400
    body = await resp.get_json()
    assert body["error"] == "invalid_image_ids"


@pytest.mark.asyncio
async def test_bulk_delete_non_int_400(client):
    resp = await client.post(
        "/api/admin/images/bulk-delete",
        json={"image_ids": ["foo", 2], "dry_run": True},
    )
    assert resp.status_code == 400


@pytest.mark.asyncio
async def test_bulk_delete_wrong_confirm_400_with_expected_token(
    client, db, tmp_path,
):
    a = Artist(name="B", slug="b")
    db.add(a)
    await db.flush()
    img = ImageRecord(
        artist_id=a.id, path=str(tmp_path / "x.jpg"),
        sha256="c" * 64, size_bytes=10, mime="image/jpeg",
        origin="imported_filesystem",
    )
    db.add(img)
    await db.commit()
    img_id = img.id

    resp = await client.post(
        "/api/admin/images/bulk-delete",
        json={
            "image_ids": [img_id], "dry_run": False, "confirm": "nope",
        },
    )
    assert resp.status_code == 400
    body = await resp.get_json()
    assert body["error"] == "confirm_mismatch"
    assert body["expected"].startswith("delete-images-")


@pytest.mark.asyncio
async def test_bulk_delete_correct_confirm_dispatches(
    client, db, tmp_path, monkeypatch,
):
    a = Artist(name="B", slug="b")
    db.add(a)
    await db.flush()
    img = ImageRecord(
        artist_id=a.id, path=str(tmp_path / "x.jpg"),
        sha256="d" * 64, size_bytes=10, mime="image/jpeg",
        origin="imported_filesystem",
    )
    db.add(img)
    await db.commit()
    img_id = img.id

    sha8 = hashlib.sha256(str(img_id).encode("utf-8")).hexdigest()[:8]

    dispatched = []

    class _Result:
        id = "fake-bulk-id"

    def _delay(**kw):
        dispatched.append(kw)
        return _Result()

    monkeypatch.setattr(
        "backend.app.tasks.admin.bulk_delete_images_task.delay", _delay,
    )

    resp = await client.post(
        "/api/admin/images/bulk-delete",
        json={
            "image_ids": [img_id],
            "dry_run": False,
            "confirm": f"delete-images-{sha8}",
        },
    )
    assert resp.status_code == 202
    body = await resp.get_json()
    assert body["task_id"] == "fake-bulk-id"
    assert dispatched == [{"image_ids": [img_id]}]


# --- Tier-B: DELETE /tags/<id> + POST /tags/<dest>/merge -----------


@pytest.mark.asyncio
async def test_tag_delete_200_after_cascade(client, db):
    t = Tag(name="doomed-tag", kind=TagKind.general)
    db.add(t)
    await db.commit()
    tag_id = t.id

    resp = await client.delete(f"/api/admin/tags/{tag_id}")
    assert resp.status_code == 200
    body = await resp.get_json()
    assert body["deleted"]["id"] == tag_id
    assert body["associations_removed"] == 0


@pytest.mark.asyncio
async def test_tag_delete_404_unknown(client):
    resp = await client.delete("/api/admin/tags/9999999")
    assert resp.status_code == 404


@pytest.mark.asyncio
async def test_tag_merge_succeeds_for_same_kind(client, db):
    src = Tag(name="src-tag", kind=TagKind.general)
    dest = Tag(name="dest-tag", kind=TagKind.general)
    db.add_all([src, dest])
    await db.commit()
    src_id = src.id
    dest_id = dest.id

    resp = await client.post(
        f"/api/admin/tags/{dest_id}/merge",
        json={"source_id": src_id},
    )
    assert resp.status_code == 200
    body = await resp.get_json()
    assert body["result"]["target_id"] == dest_id


@pytest.mark.asyncio
async def test_tag_merge_rejects_self_merge(client, db):
    t = Tag(name="x", kind=TagKind.general)
    db.add(t)
    await db.commit()
    resp = await client.post(
        f"/api/admin/tags/{t.id}/merge",
        json={"source_id": t.id},
    )
    assert resp.status_code == 400


@pytest.mark.asyncio
async def test_tag_merge_returns_400_on_kind_mismatch(client, db):
    src = Tag(name="src", kind=TagKind.general)
    dest = Tag(name="dest", kind=TagKind.artist)
    db.add_all([src, dest])
    await db.commit()
    resp = await client.post(
        f"/api/admin/tags/{dest.id}/merge",
        json={"source_id": src.id},
    )
    assert resp.status_code == 400
    body = await resp.get_json()
    assert body["error"] == "tag_kind_mismatch"


# --- Tier-B helper: GET /tags/<id>/usage-count ----------------------


@pytest.mark.asyncio
async def test_tag_usage_count_returns_zero_for_unused(client, db):
    t = Tag(name="lonely", kind=TagKind.general)
    db.add(t)
    await db.commit()
    resp = await client.get(f"/api/admin/tags/{t.id}/usage-count")
    assert resp.status_code == 200
    body = await resp.get_json()
    assert body["count"] == 0


# --- Tier-A: POST /tags/prune-unused --------------------------------


@pytest.mark.asyncio
async def test_prune_unused_dry_run_lists_unused(client, db, tmp_path):
    a = Artist(name="P", slug="p")
    db.add(a)
    await db.flush()
    img = ImageRecord(
        artist_id=a.id, path=str(tmp_path / "p.jpg"),
        sha256="e" * 64, size_bytes=10, mime="image/jpeg",
        origin="imported_filesystem",
    )
    db.add(img)
    used = Tag(name="kept", kind=TagKind.general)
    unused = Tag(name="prune", kind=TagKind.general)
    db.add_all([used, unused])
    await db.flush()
    await db.execute(image_tag.insert().values(
        image_record_id=img.id, tag_id=used.id,
    ))
    await db.commit()

    resp = await client.post(
        "/api/admin/tags/prune-unused", json={"dry_run": True},
    )
    body = await resp.get_json()
    assert body["count"] == 1
    assert "prune" in body["sample_names"]


@pytest.mark.asyncio
async def test_prune_unused_commit_deletes_and_returns_count(client, db):
    db.add(Tag(name="byebye", kind=TagKind.general))
    await db.commit()

    resp = await client.post(
        "/api/admin/tags/prune-unused", json={"dry_run": False},
    )
    body = await resp.get_json()
    assert body["deleted"] >= 1
    assert "byebye" in body["sample_names"]


@pytest.mark.asyncio
async def test_purge_legacy_dry_run_counts_by_kind_and_prefix(client, db):
    db.add_all([
        Tag(name="BlenderKnight:Hannah_BJ_Loops", kind=TagKind.archive),
        Tag(name="BlenderKnight:May Animation", kind=TagKind.post),
        Tag(name="SomeArtist", kind=TagKind.artist),
        # IR `source` kind fell back to general during migration —
        # caught by the source:* name prefix, not by kind.
        Tag(name="source:patreon", kind=TagKind.general),
        Tag(name="blonde hair", kind=TagKind.general),  # must survive
    ])
    await db.commit()

    resp = await client.post(
        "/api/admin/tags/purge-legacy", json={"dry_run": True},
    )
    body = await resp.get_json()
    assert body["count"] == 4
    assert body["by_kind"] == {"archive": 1, "post": 1, "artist": 1}
    assert body["by_prefix"] == {"source:*": 1}
    assert "blonde hair" not in body["sample_names"]
    assert "source:patreon" in body["sample_names"]


@pytest.mark.asyncio
async def test_purge_legacy_commit_deletes_only_legacy(client, db):
    from sqlalchemy import func, select

    db.add_all([
        Tag(name="arch1", kind=TagKind.archive),
        Tag(name="source:fanbox", kind=TagKind.general),
        Tag(name="keepme", kind=TagKind.general),
        Tag(name="char1", kind=TagKind.character),
    ])
    await db.commit()

    resp = await client.post(
        "/api/admin/tags/purge-legacy", json={"dry_run": False},
    )
    body = await resp.get_json()
    assert body["deleted"] == 2  # arch1 + source:fanbox

    # The plain general + character tags survive.
    keep = (await db.execute(
        select(Tag.name).where(Tag.name.in_(["keepme", "char1"]))
    )).scalars().all()
    assert set(keep) == {"keepme", "char1"}
    # No archive/post/artist or source:* left.
    gone = (await db.execute(
        select(func.count()).select_from(Tag).where(
            (Tag.kind.in_([TagKind.archive, TagKind.post, TagKind.artist]))
            | (Tag.name.like("source:%"))
        )
    )).scalar_one()
    assert gone == 0