"""Tests: Migrations-Laufzeit (Kern-Tabelle, Idempotenz, Plugin-Migration)."""
from __future__ import annotations

from pathlib import Path

from sqlalchemy import text

from redaktionskern.config import Settings


def test_kern_tabellen_existieren(app):
    with app.state.engine.connect() as conn:
        zeilen = conn.execute(text("SELECT name FROM sqlite_master WHERE type='table'"))
    namen = {zeile[0] for zeile in zeilen}
    assert "users" in namen
    assert "schema_migrations" in namen


def test_migration_wird_protokolliert(app):
    with app.state.engine.connect() as conn:
        zeilen = conn.execute(
            text("SELECT plugin, version FROM schema_migrations")
        ).fetchall()
    protokoll = {(p, v) for p, v in zeilen}
    assert ("core", "0001_benutzer") in protokoll


def test_plugin_migration_idempotent(tmp_path):
    """Ein Plugin mit eigener Migration; zweiter Start darf nichts doppelt tun."""
    plugin_ordner = tmp_path / "plugins" / "testmig"
    plugin_ordner.mkdir(parents=True)
    (plugin_ordner / "__init__.py").write_text(
        """
from sqlalchemy import text
from redaktionskern.contracts import BasePlugin, Migration


def _tabelle(conn):
    conn.execute(text(
        "CREATE TABLE IF NOT EXISTS testplugin_dings (id INTEGER PRIMARY KEY)"
    ))


class TestMigPlugin(BasePlugin):
    name = "testmig"
    title = "Testmigration"

    def migrations(self):
        return [Migration(version="0001_tabelle", up=_tabelle)]


plugin = TestMigPlugin()
""",
        encoding="utf-8",
    )

    settings = Settings(
        database_url=f"sqlite:///{tmp_path / 'mig.db'}",
        session_secret="s",
        initial_admin_password="x",
        plugins_dir=tmp_path / "plugins",
    )

    from redaktionskern.app import create_app

    create_app(settings)
    app2 = create_app(settings)  # zweiter Lauf: darf nicht fehlschlagen

    with app2.state.engine.connect() as conn:
        tabellen = {
            zeile[0]
            for zeile in conn.execute(text("SELECT name FROM sqlite_master WHERE type='table'"))
        }
        protokoll = conn.execute(
            text("SELECT version FROM schema_migrations WHERE plugin='testmig'")
        ).fetchall()
    assert "testplugin_dings" in tabellen
    assert [z[0] for z in protokoll] == ["0001_tabelle"]