"""
CRUD for løp (races) og stasjoner (stations).
"""

import uuid
from typing import Optional

import aiosqlite


async def init_race_tables(db: aiosqlite.Connection) -> None:
    await db.executescript("""
        CREATE TABLE IF NOT EXISTS races (
            race_id     TEXT PRIMARY KEY,
            name        TEXT NOT NULL,
            date        TEXT,
            description TEXT,
            is_active   INTEGER NOT NULL DEFAULT 0,
            created_at  TEXT NOT NULL DEFAULT (datetime('now'))
        );

        CREATE TABLE IF NOT EXISTS stations (
            station_id    TEXT PRIMARY KEY,
            race_id       TEXT NOT NULL REFERENCES races(race_id) ON DELETE CASCADE,
            name          TEXT NOT NULL,
            display_name  TEXT NOT NULL,
            station_order INTEGER NOT NULL DEFAULT 0,
            gps_lat       REAL,
            gps_lon       REAL,
            gps_alt       REAL,
            created_at    TEXT NOT NULL DEFAULT (datetime('now')),
            UNIQUE(race_id, name)
        );

        CREATE INDEX IF NOT EXISTS idx_stations_race ON stations(race_id, station_order);
    """)
    await db.commit()


# ── Løp ──────────────────────────────────────────────────────────────────────

async def create_race(
    db: aiosqlite.Connection,
    name: str,
    date: Optional[str] = None,
    description: Optional[str] = None,
) -> dict:
    race_id = str(uuid.uuid4())
    await db.execute(
        "INSERT INTO races (race_id, name, date, description) VALUES (?, ?, ?, ?)",
        (race_id, name, date, description),
    )
    # Sett som aktivt hvis det er første løpet
    async with db.execute("SELECT COUNT(*) FROM races") as cur:
        count = (await cur.fetchone())[0]
    if count == 1:
        await db.execute("UPDATE races SET is_active = 1 WHERE race_id = ?", (race_id,))

    # Opprett standard start- og målstasjon
    for order, (sname, display) in enumerate([("start", "Start"), ("finish", "Mål")]):
        await db.execute(
            """INSERT INTO stations (station_id, race_id, name, display_name, station_order)
               VALUES (?, ?, ?, ?, ?)""",
            (str(uuid.uuid4()), race_id, sname, display, order * 1000),
        )

    await db.commit()
    return await get_race(db, race_id)


async def get_race(db: aiosqlite.Connection, race_id: str) -> Optional[dict]:
    async with db.execute("SELECT * FROM races WHERE race_id = ?", (race_id,)) as cur:
        row = await cur.fetchone()
    return dict(row) if row else None


async def list_races(db: aiosqlite.Connection) -> list[dict]:
    async with db.execute("SELECT * FROM races ORDER BY date DESC, created_at DESC") as cur:
        rows = await cur.fetchall()
    return [dict(r) for r in rows]


async def update_race(
    db: aiosqlite.Connection,
    race_id: str,
    name: str,
    date: Optional[str],
    description: Optional[str],
) -> bool:
    cur = await db.execute(
        "UPDATE races SET name = ?, date = ?, description = ? WHERE race_id = ?",
        (name, date, description, race_id),
    )
    await db.commit()
    return cur.rowcount > 0


async def delete_race(db: aiosqlite.Connection, race_id: str) -> bool:
    cur = await db.execute("DELETE FROM races WHERE race_id = ?", (race_id,))
    await db.commit()
    return cur.rowcount > 0


async def set_active_race(db: aiosqlite.Connection, race_id: str) -> bool:
    await db.execute("UPDATE races SET is_active = 0")
    cur = await db.execute(
        "UPDATE races SET is_active = 1 WHERE race_id = ?", (race_id,)
    )
    await db.commit()
    return cur.rowcount > 0


async def get_active_race(db: aiosqlite.Connection) -> Optional[dict]:
    async with db.execute("SELECT * FROM races WHERE is_active = 1 LIMIT 1") as cur:
        row = await cur.fetchone()
    return dict(row) if row else None


# ── Stasjoner ─────────────────────────────────────────────────────────────────

async def list_stations(db: aiosqlite.Connection, race_id: str) -> list[dict]:
    async with db.execute(
        "SELECT * FROM stations WHERE race_id = ? ORDER BY station_order",
        (race_id,),
    ) as cur:
        rows = await cur.fetchall()
    return [dict(r) for r in rows]


async def get_station(db: aiosqlite.Connection, station_id: str) -> Optional[dict]:
    async with db.execute(
        "SELECT * FROM stations WHERE station_id = ?", (station_id,)
    ) as cur:
        row = await cur.fetchone()
    return dict(row) if row else None


async def create_station(
    db: aiosqlite.Connection,
    race_id: str,
    name: str,
    display_name: str,
    station_order: int,
    gps_lat: Optional[float] = None,
    gps_lon: Optional[float] = None,
    gps_alt: Optional[float] = None,
) -> dict:
    station_id = str(uuid.uuid4())
    await db.execute(
        """INSERT INTO stations
           (station_id, race_id, name, display_name, station_order, gps_lat, gps_lon, gps_alt)
           VALUES (?, ?, ?, ?, ?, ?, ?, ?)""",
        (station_id, race_id, name, display_name, station_order, gps_lat, gps_lon, gps_alt),
    )
    await db.commit()
    return dict((await db.execute(
        "SELECT * FROM stations WHERE station_id = ?", (station_id,)
    )).get_cursor() or {})


async def upsert_station(
    db: aiosqlite.Connection,
    race_id: str,
    name: str,
    display_name: str,
    station_order: int,
    gps_lat: Optional[float] = None,
    gps_lon: Optional[float] = None,
    gps_alt: Optional[float] = None,
    station_id: Optional[str] = None,
) -> dict:
    if station_id:
        await db.execute(
            """UPDATE stations SET name=?, display_name=?, station_order=?,
               gps_lat=?, gps_lon=?, gps_alt=? WHERE station_id=?""",
            (name, display_name, station_order, gps_lat, gps_lon, gps_alt, station_id),
        )
    else:
        station_id = str(uuid.uuid4())
        await db.execute(
            """INSERT INTO stations
               (station_id, race_id, name, display_name, station_order, gps_lat, gps_lon, gps_alt)
               VALUES (?, ?, ?, ?, ?, ?, ?, ?)""",
            (station_id, race_id, name, display_name, station_order, gps_lat, gps_lon, gps_alt),
        )
    await db.commit()
    async with db.execute("SELECT * FROM stations WHERE station_id = ?", (station_id,)) as cur:
        row = await cur.fetchone()
    return dict(row)


async def delete_station(db: aiosqlite.Connection, station_id: str) -> bool:
    # Ikke tillat sletting av start/finish
    async with db.execute(
        "SELECT name FROM stations WHERE station_id = ?", (station_id,)
    ) as cur:
        row = await cur.fetchone()
    if row and row["name"] in ("start", "finish"):
        return False
    cur = await db.execute("DELETE FROM stations WHERE station_id = ?", (station_id,))
    await db.commit()
    return cur.rowcount > 0