"""Postgres-only: Alembic-Revision e7f1a9c3b214 (Ausbaustufe 14) hoch/runter
auf einer Wegwerf-DB (Name muss auf '_test' enden). Beispiel:
  podman run -d --rm --name a14-pg -e POSTGRES_PASSWORD=wegwerf \
    -e POSTGRES_DB=fb_test -p 127.0.0.1:55432:5432 docker.io/library/postgres:17.10
  FB_TEST_PG_URL=postgresql+psycopg://postgres:wegwerf@127.0.0.1:55432/fb_test \
    .venv/bin/python -m pytest -q tests/test_migration_pg.py
"""
import os
from pathlib import Path

import pytest
from alembic import command
from alembic.config import Config
from sqlalchemy import create_engine, inspect, text
from sqlalchemy.engine import make_url

PG_URL = os.environ.get("FB_TEST_PG_URL")
pytestmark = pytest.mark.skipif(not PG_URL, reason="FB_TEST_PG_URL nicht gesetzt")
ROOT = Path(__file__).resolve().parent.parent


@pytest.fixture
def alembic_cfg(monkeypatch):
    assert make_url(PG_URL).database.endswith("_test"), "nur Wegwerf-DB *_test!"
    monkeypatch.setenv("FB_DATABASE_URL", PG_URL)
    from app.config import get_settings
    get_settings.cache_clear()
    engine = create_engine(PG_URL)
    with engine.begin() as conn:
        conn.execute(text("DROP SCHEMA public CASCADE; CREATE SCHEMA public"))
    cfg = Config(str(ROOT / "alembic.ini"))
    cfg.set_main_option("script_location", str(ROOT / "alembic"))
    yield cfg, engine
    # Schema leeren, damit test_views_pg.py (create_all) nicht auf dem
    # herabgestuften Alembic-Stand aufsetzt.
    with engine.begin() as conn:
        conn.execute(text("DROP SCHEMA public CASCADE; CREATE SCHEMA public"))
    engine.dispose()
    get_settings.cache_clear()


def test_migration_a14_up_down(alembic_cfg):
    cfg, engine = alembic_cfg
    command.upgrade(cfg, "d5e8b3c7a410")
    with engine.begin() as conn:
        conn.execute(text("INSERT INTO scenarios (id, name, description, include_recurring, "
                          "include_planned) VALUES (1, 'S', '', true, true)"))
        conn.execute(text(
            "INSERT INTO scenario_modifiers (id, scenario_id, target_type, target_id, kind, "
            "value, end_date) VALUES "
            "(1, 1, 'recurring', 7, 'ende', 0, '2030-10-15'), "
            "(2, 1, 'category', 3, 'percent', 10, NULL)"))
    command.upgrade(cfg, "head")
    with engine.begin() as conn:
        rows = conn.execute(text("SELECT id, kind, value, start_date, end_date "
                                 "FROM scenario_modifiers ORDER BY id")).all()
        assert [(r.id, r.kind, str(r.value), r.start_date, str(r.end_date))
                for r in rows] == [(1, "ende", "0.00", None, "2030-10-15"),
                                   (2, "percent", "10.00", None, "None")]
        conn.execute(text(
            "INSERT INTO scenario_modifiers (id, scenario_id, target_type, target_id, kind, "
            "value, start_date, end_date) VALUES "
            "(3, 1, 'recurring', 7, 'set', -80, '2030-11-01', NULL), "
            "(4, 1, 'recurring', 7, 'percent', 50, '2030-11-01', '2030-12-31')"))
        conn.execute(text(
            "INSERT INTO scenario_recurring_items (scenario_id, name, amount, rhythm, due_day) "
            "VALUES (1, 'W', -10, 'monthly', 14)"))
    insp = inspect(engine)
    assert "scenario_recurring_items" in insp.get_table_names()
    assert "category_id" in {c["name"] for c in insp.get_columns("scenario_planned_items")}
    command.downgrade(cfg, "d5e8b3c7a410")
    with engine.begin() as conn:
        rows = conn.execute(text("SELECT id, kind, end_date FROM scenario_modifiers "
                                 "ORDER BY id")).all()
        assert [(r.id, r.kind, str(r.end_date)) for r in rows] == [
            (1, "ende", "2030-10-15"), (2, "percent", "None"), (4, "percent", "None")]
    insp = inspect(engine)
    assert "scenario_recurring_items" not in insp.get_table_names()
    assert "start_date" not in {c["name"] for c in insp.get_columns("scenario_modifiers")}