"""Migration 009's backfill: three legacy shapes -> one `day_assertion` row each.

`test_schema_parity.py` proves the migration chain and `_FULL_SCHEMA` describe
the same *shape*. This proves 009 moves the *data* correctly — restructure
step 3 (see `~/.claude/plans/please-make-a-plan-cheerful-beacon.md.restructure`):

- a pinned `planned_leave_day` row (`is_pinned=1`) -> an assertion carrying
  its `day_type`/`is_dubbeldag`/`wish_id`.
- an ad-hoc `planned_leave_day` row (`wish_id IS NULL`) -> an assertion the
  same way, even when NOT pinned.
- an ordinary planner-derived row (`is_pinned=0`, `wish_id` set) -> nothing:
  it is exactly what the new table must NOT treat as an assertion.
- every `planned_day_exclusion` row -> a `day_type='none'` assertion.
- when a legacy exclusion and a pinned/ad-hoc row coincide at the same key,
  the exclusion wins (`day_type='none'` survives, not the pin).

Driven through the real Alembic chain (upgrade to 008, insert pre-009 rows,
upgrade to head), not through `_FULL_SCHEMA`, because the pre-009 backfill
source rows must exist in their pre-migration shape.
"""

from __future__ import annotations

import sqlite3
import uuid
from datetime import date, datetime
from pathlib import Path

from alembic import command
from alembic.config import Config


def _alembic_config(db_path: Path) -> Config:
    cfg = Config("alembic.ini")
    cfg.set_main_option("sqlalchemy.url", f"sqlite:///{db_path}")
    return cfg


def _seed_workspace_and_child(conn: sqlite3.Connection, now: str) -> tuple[str, str]:
    ws_id = str(uuid.uuid4())
    child_id = str(uuid.uuid4())
    conn.execute(
        "INSERT INTO workspace (id, name, created_at) VALUES (?, ?, ?)", (ws_id, "WS", now)
    )
    conn.execute(
        "INSERT INTO child (id, workspace_id, name, birth_date, "
        "preschool_start_date, preschool_planning_days_per_year, created_at) "
        "VALUES (?, ?, ?, ?, NULL, 0, ?)",
        (child_id, ws_id, "Barn", date(2026, 5, 1).isoformat(), now),
    )
    return ws_id, child_id


def _insert_planned_leave_day(
    conn: sqlite3.Connection,
    *,
    workspace_id: str,
    child_id: str,
    parent_id: str,
    day: date,
    day_type: str,
    is_pinned: bool,
    wish_id: str | None,
    is_dubbeldag: bool = False,
    now: str,
) -> None:
    conn.execute(
        "INSERT INTO planned_leave_day "
        "(id, workspace_id, child_id, parent_personal_data_uuid, date, day_type, "
        " is_dubbeldag, wish_id, is_pinned, created_at, updated_at) "
        "VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)",
        (
            str(uuid.uuid4()),
            workspace_id,
            child_id,
            parent_id,
            day.isoformat(),
            day_type,
            int(is_dubbeldag),
            wish_id,
            int(is_pinned),
            now,
            now,
        ),
    )


def _insert_exclusion(
    conn: sqlite3.Connection,
    *,
    workspace_id: str,
    child_id: str,
    parent_id: str,
    day: date,
    now: str,
) -> None:
    conn.execute(
        "INSERT INTO planned_day_exclusion "
        "(id, workspace_id, child_id, parent_personal_data_uuid, date, created_at, updated_at) "
        "VALUES (?, ?, ?, ?, ?, ?, ?)",
        (str(uuid.uuid4()), workspace_id, child_id, parent_id, day.isoformat(), now, now),
    )


def _assertions(db_path: Path, workspace_id: str) -> list[sqlite3.Row]:
    conn = sqlite3.connect(db_path)
    conn.row_factory = sqlite3.Row
    try:
        return conn.execute(
            "SELECT * FROM day_assertion WHERE workspace_id = ? ORDER BY date", (workspace_id,)
        ).fetchall()
    finally:
        conn.close()


def test_pinned_row_becomes_a_concrete_assertion(tmp_path: Path) -> None:
    db = tmp_path / "pinned.db"
    command.upgrade(_alembic_config(db), "008")
    now = datetime(2026, 1, 1, 12, 0, 0).isoformat()

    conn = sqlite3.connect(db)
    ws_id, child_id = _seed_workspace_and_child(conn, now)
    parent_id = str(uuid.uuid4())
    wish_id = str(uuid.uuid4())
    _insert_planned_leave_day(
        conn,
        workspace_id=ws_id,
        child_id=child_id,
        parent_id=parent_id,
        day=date(2027, 2, 3),
        day_type="lagsta",
        is_pinned=True,
        wish_id=wish_id,
        is_dubbeldag=True,
        now=now,
    )
    conn.commit()
    conn.close()

    command.upgrade(_alembic_config(db), "head")

    rows = _assertions(db, ws_id)
    assert len(rows) == 1
    assert rows[0]["day_type"] == "lagsta"
    assert bool(rows[0]["is_dubbeldag"]) is True
    assert rows[0]["wish_id"] == wish_id
    assert rows[0]["parent_personal_data_uuid"] == parent_id


def test_ad_hoc_row_becomes_an_assertion_even_when_not_pinned(tmp_path: Path) -> None:
    db = tmp_path / "adhoc.db"
    command.upgrade(_alembic_config(db), "008")
    now = datetime(2026, 1, 1, 12, 0, 0).isoformat()

    conn = sqlite3.connect(db)
    ws_id, child_id = _seed_workspace_and_child(conn, now)
    parent_id = str(uuid.uuid4())
    _insert_planned_leave_day(
        conn,
        workspace_id=ws_id,
        child_id=child_id,
        parent_id=parent_id,
        day=date(2027, 3, 1),
        day_type="vacation",
        is_pinned=False,
        wish_id=None,
        now=now,
    )
    conn.commit()
    conn.close()

    command.upgrade(_alembic_config(db), "head")

    rows = _assertions(db, ws_id)
    assert len(rows) == 1
    assert rows[0]["day_type"] == "vacation"
    assert rows[0]["wish_id"] is None


def test_ordinary_planner_derived_row_is_not_backfilled(tmp_path: Path) -> None:
    """The whole point of the new table: a derived (unpinned, wish-attributed)

    row is NOT a user assertion and must not become one.
    """
    db = tmp_path / "derived.db"
    command.upgrade(_alembic_config(db), "008")
    now = datetime(2026, 1, 1, 12, 0, 0).isoformat()

    conn = sqlite3.connect(db)
    ws_id, child_id = _seed_workspace_and_child(conn, now)
    parent_id = str(uuid.uuid4())
    wish_id = str(uuid.uuid4())
    _insert_planned_leave_day(
        conn,
        workspace_id=ws_id,
        child_id=child_id,
        parent_id=parent_id,
        day=date(2027, 4, 1),
        day_type="sjukpenning",
        is_pinned=False,
        wish_id=wish_id,
        now=now,
    )
    conn.commit()
    conn.close()

    command.upgrade(_alembic_config(db), "head")

    assert _assertions(db, ws_id) == []


def test_exclusion_row_becomes_a_none_assertion(tmp_path: Path) -> None:
    db = tmp_path / "exclusion.db"
    command.upgrade(_alembic_config(db), "008")
    now = datetime(2026, 1, 1, 12, 0, 0).isoformat()

    conn = sqlite3.connect(db)
    ws_id, child_id = _seed_workspace_and_child(conn, now)
    parent_id = str(uuid.uuid4())
    _insert_exclusion(
        conn,
        workspace_id=ws_id,
        child_id=child_id,
        parent_id=parent_id,
        day=date(2027, 2, 3),
        now=now,
    )
    conn.commit()
    conn.close()

    command.upgrade(_alembic_config(db), "head")

    rows = _assertions(db, ws_id)
    assert len(rows) == 1
    assert rows[0]["day_type"] == "none"
    assert rows[0]["wish_id"] is None
    assert bool(rows[0]["is_dubbeldag"]) is False


def test_exclusion_wins_over_a_coinciding_pinned_row(tmp_path: Path) -> None:
    """Historical data where an exclusion and a pinned row share a key —

    shouldn't happen going forward (`PlannedDayExclusionService.exclude()`
    always deletes the `planned_leave_day` row first), but the migration must
    resolve it the same way at rest: the exclusion (a stronger, later
    instruction) wins.
    """
    db = tmp_path / "conflict.db"
    command.upgrade(_alembic_config(db), "008")
    now = datetime(2026, 1, 1, 12, 0, 0).isoformat()

    conn = sqlite3.connect(db)
    ws_id, child_id = _seed_workspace_and_child(conn, now)
    parent_id = str(uuid.uuid4())
    day = date(2027, 5, 1)
    _insert_planned_leave_day(
        conn,
        workspace_id=ws_id,
        child_id=child_id,
        parent_id=parent_id,
        day=day,
        day_type="sjukpenning",
        is_pinned=True,
        wish_id=None,
        now=now,
    )
    _insert_exclusion(
        conn, workspace_id=ws_id, child_id=child_id, parent_id=parent_id, day=day, now=now
    )
    conn.commit()
    conn.close()

    command.upgrade(_alembic_config(db), "head")

    rows = _assertions(db, ws_id)
    assert len(rows) == 1
    assert rows[0]["day_type"] == "none"


def test_downgrade_drops_the_table(tmp_path: Path) -> None:
    db = tmp_path / "downgrade.db"
    command.upgrade(_alembic_config(db), "head")

    conn = sqlite3.connect(db)
    tables = {
        row[0]
        for row in conn.execute("SELECT name FROM sqlite_master WHERE type = 'table'").fetchall()
    }
    conn.close()
    assert "day_assertion" in tables

    command.downgrade(_alembic_config(db), "008")

    conn = sqlite3.connect(db)
    tables = {
        row[0]
        for row in conn.execute("SELECT name FROM sqlite_master WHERE type = 'table'").fetchall()
    }
    # is_pinned / planned_day_exclusion are untouched by 009 either direction —
    # step 3a is additive, see the migration's module docstring.
    assert "planned_day_exclusion" in tables
    conn.close()
    assert "day_assertion" not in tables