"""
CRUD for utøverprofiler og startliste.
Bruker aiosqlite for async tilgang fra FastAPI.
"""

import csv
import io
import uuid
from typing import Optional

import aiosqlite

DB_PATH = "/data/timing.db"


async def init_db(db: aiosqlite.Connection) -> None:
    await db.executescript("""
        CREATE TABLE IF NOT EXISTS athletes (
            profile_id   TEXT PRIMARY KEY,
            bib_number   TEXT UNIQUE,
            name         TEXT,
            club         TEXT,
            created_at   TEXT NOT NULL DEFAULT (datetime('now'))
        );

        CREATE TABLE IF NOT EXISTS passages (
            passage_id      TEXT PRIMARY KEY,
            profile_id      TEXT REFERENCES athletes(profile_id),
            bib_number      TEXT,
            station         TEXT NOT NULL,
            timestamp_utc   TEXT NOT NULL,
            gps_lat         REAL,
            gps_lon         REAL,
            gps_alt         REAL,
            confidence      REAL,
            id_method       TEXT,
            source_image    TEXT,
            needs_review    INTEGER NOT NULL DEFAULT 0,
            review_note     TEXT,
            created_at      TEXT NOT NULL DEFAULT (datetime('now'))
        );

        CREATE TABLE IF NOT EXISTS passage_images (
            image_id        TEXT PRIMARY KEY,
            passage_id      TEXT NOT NULL REFERENCES passages(passage_id) ON DELETE CASCADE,
            image_path      TEXT NOT NULL,
            timestamp_utc   TEXT NOT NULL,
            proximity_score REAL NOT NULL DEFAULT 0,
            created_at      TEXT NOT NULL DEFAULT (datetime('now'))
        );

        CREATE INDEX IF NOT EXISTS idx_passages_profile ON passages(profile_id);
        CREATE INDEX IF NOT EXISTS idx_passages_station ON passages(station);
        CREATE INDEX IF NOT EXISTS idx_passages_needs_review ON passages(needs_review);
        CREATE INDEX IF NOT EXISTS idx_passage_images_passage ON passage_images(passage_id);
    """)
    await db.commit()


async def get_db() -> aiosqlite.Connection:
    db = await aiosqlite.connect(DB_PATH)
    db.row_factory = aiosqlite.Row
    await init_db(db)
    return db


# --- Utøverprofiler ---

async def upsert_athlete(
    db: aiosqlite.Connection,
    bib_number: str,
    name: str,
    club: Optional[str] = None,
) -> str:
    """Opprett eller oppdater utøver basert på startnummer. Returnerer profile_id."""
    async with db.execute(
        "SELECT profile_id FROM athletes WHERE bib_number = ?", (bib_number,)
    ) as cur:
        row = await cur.fetchone()

    if row:
        profile_id = row["profile_id"]
        await db.execute(
            "UPDATE athletes SET name = ?, club = ? WHERE profile_id = ?",
            (name, club, profile_id),
        )
    else:
        profile_id = str(uuid.uuid4())
        await db.execute(
            "INSERT INTO athletes (profile_id, bib_number, name, club) VALUES (?, ?, ?, ?)",
            (profile_id, bib_number, name, club),
        )
    await db.commit()
    return profile_id


async def import_startlist_csv(db: aiosqlite.Connection, csv_content: str) -> dict:
    """
    Importer startliste fra CSV-streng.
    Forventet kolonner: bib_number, name (og valgfritt: club)
    Returnerer {'imported': N, 'errors': [...]}
    """
    reader = csv.DictReader(io.StringIO(csv_content))
    imported = 0
    errors = []

    # Normaliser kolonnenavn (fjern whitespace, lowercase)
    fieldnames = [f.strip().lower() for f in (reader.fieldnames or [])]
    if "bib_number" not in fieldnames and "bib" not in fieldnames:
        return {"imported": 0, "errors": ["CSV mangler 'bib_number'-kolonne"]}
    if "name" not in fieldnames:
        return {"imported": 0, "errors": ["CSV mangler 'name'-kolonne"]}

    bib_col = "bib_number" if "bib_number" in fieldnames else "bib"

    for i, row in enumerate(reader, start=2):
        # Normaliser nøkler
        row = {k.strip().lower(): v.strip() for k, v in row.items()}
        bib = row.get(bib_col, "").strip()
        name = row.get("name", "").strip()
        club = row.get("club", "").strip() or None

        if not bib or not name:
            errors.append(f"Rad {i}: mangler bib eller navn")
            continue
        try:
            await upsert_athlete(db, bib, name, club)
            imported += 1
        except Exception as e:
            errors.append(f"Rad {i}: {e}")

    return {"imported": imported, "errors": errors}


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


async def list_athletes(db: aiosqlite.Connection) -> list[dict]:
    async with db.execute(
        "SELECT * FROM athletes ORDER BY CAST(bib_number AS INTEGER), bib_number"
    ) as cur:
        rows = await cur.fetchall()
    return [dict(r) for r in rows]


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


async def clear_startlist(db: aiosqlite.Connection) -> None:
    await db.execute("DELETE FROM athletes")
    await db.commit()