"""FC-5: ir_ingest unit tests."""
import json
from datetime import UTC, datetime

import pytest
from sqlalchemy import select

from backend.app.models import Tag
from backend.app.services.migrators import ir_ingest

pytestmark = pytest.mark.integration


def _ir_export(tags=None, artist_assignments=None, tag_associations=None, series_pages=None):
    return {
        "source_app": "imagerepo",
        "schema_version": 1,
        "exported_at": datetime.now(UTC).isoformat(),
        "tags": tags or [],
        "image_artist_assignments": artist_assignments or [],
        "image_tag_associations": tag_associations or [],
        "series_pages": series_pages or [],
    }


@pytest.mark.asyncio
async def test_general_tag_created(db, tmp_path):
    data = _ir_export(tags=[
        {"name": "blue_eyes", "kind": "general", "fandom_name": None},
    ])
    await ir_ingest.migrate_async(db, data=data, images_root=tmp_path, dry_run=False)

    tag = (await db.execute(
        select(Tag).where(Tag.name == "blue_eyes", Tag.kind == "general")
    )).scalar_one()
    assert tag.fandom_id is None


@pytest.mark.asyncio
async def test_character_tag_resolves_fandom_name(db, tmp_path):
    data = _ir_export(tags=[
        {"name": "Wonderland", "kind": "fandom", "fandom_name": None},
        {"name": "Alice", "kind": "character", "fandom_name": "Wonderland"},
    ])
    await ir_ingest.migrate_async(db, data=data, images_root=tmp_path, dry_run=False)

    fandom = (await db.execute(
        select(Tag).where(Tag.name == "Wonderland", Tag.kind == "fandom")
    )).scalar_one()
    alice = (await db.execute(
        select(Tag).where(Tag.name == "Alice", Tag.kind == "character")
    )).scalar_one()
    assert alice.fandom_id == fandom.id


@pytest.mark.asyncio
async def test_artist_and_post_kinds_skipped(db, tmp_path):
    data = _ir_export(tags=[
        {"name": "BobArtist", "kind": "artist", "fandom_name": None},
        {"name": "PostXYZ", "kind": "post", "fandom_name": None},
        {"name": "general_one", "kind": "general", "fandom_name": None},
    ])
    counts = await ir_ingest.migrate_async(db, data=data, images_root=tmp_path, dry_run=False)
    assert counts["rows_skipped"] >= 2

    bob = (await db.execute(
        select(Tag).where(Tag.name == "BobArtist")
    )).scalar_one_or_none()
    post = (await db.execute(
        select(Tag).where(Tag.name == "PostXYZ")
    )).scalar_one_or_none()
    assert bob is None
    assert post is None


@pytest.mark.asyncio
async def test_manifest_written_to_disk(db, tmp_path):
    data = _ir_export(
        artist_assignments=[{"sha256": "a" * 64, "artist_name": "Alice"}],
        tag_associations=[
            {"sha256": "a" * 64, "tag_name": "blue_eyes", "tag_kind": "general", "fandom_name": None},
        ],
        series_pages=[
            {"sha256": "a" * 64, "series_tag_name": "MySeries", "page_number": 1},
        ],
    )
    await ir_ingest.migrate_async(db, data=data, images_root=tmp_path, dry_run=False)

    manifest_file = tmp_path / "_migration_state" / "ir_tag_manifest.json"
    assert manifest_file.exists()
    manifest = json.loads(manifest_file.read_text())
    assert manifest["schema_version"] == 1
    assert len(manifest["image_artist_assignments"]) == 1
    assert len(manifest["image_tag_associations"]) == 1
    assert len(manifest["series_pages"]) == 1


@pytest.mark.asyncio
async def test_dry_run_writes_no_manifest_and_no_tags(db, tmp_path):
    data = _ir_export(
        tags=[{"name": "dry", "kind": "general", "fandom_name": None}],
        artist_assignments=[{"sha256": "a" * 64, "artist_name": "DryArtist"}],
    )
    await ir_ingest.migrate_async(db, data=data, images_root=tmp_path, dry_run=True)

    tag = (await db.execute(
        select(Tag).where(Tag.name == "dry")
    )).scalar_one_or_none()
    assert tag is None
    manifest_file = tmp_path / "_migration_state" / "ir_tag_manifest.json"
    assert not manifest_file.exists()


@pytest.mark.asyncio
async def test_idempotent_on_rerun(db, tmp_path):
    data = _ir_export(tags=[
        {"name": "rerun", "kind": "general", "fandom_name": None},
    ])
    await ir_ingest.migrate_async(db, data=data, images_root=tmp_path, dry_run=False)
    counts2 = await ir_ingest.migrate_async(db, data=data, images_root=tmp_path, dry_run=False)
    assert counts2["rows_skipped"] >= 1


@pytest.mark.asyncio
async def test_rejects_wrong_source_app(db, tmp_path):
    bad = {"source_app": "elsewhere", "schema_version": 1, "tags": [],
           "image_artist_assignments": [], "image_tag_associations": [], "series_pages": []}
    with pytest.raises(ValueError):
        await ir_ingest.migrate_async(db, data=bad, images_root=tmp_path, dry_run=False)