"""Job-, Log- und Settings-Persistenz in PostgreSQL (KONZEPT: Postgres für Job-Logs).

Die jobs/logs-Tabellendefinition existiert bewusst identisch im Worker
(docker/worker/db.py) — es gibt kein geteiltes Paket zwischen den Containern.
Wer die Struktur ändert, ändert BEIDE Dateien. create_all ist idempotent.

Bis 23.07. lag Postgres komplett brach: GET /jobs gab hart [] zurück, nichts
schrieb je eine Zeile — der Job-Verlauf im UI war ein Placebo.
"""

import json
import os
from datetime import datetime, timezone

from sqlalchemy import (
    Column,
    DateTime,
    Integer,
    MetaData,
    String,
    Table,
    Text,
    create_engine,
    select,
)

DATABASE_URL = os.getenv(
    "DATABASE_URL", "postgresql://rippy:rippy@localhost:5432/rippy"
)

engine = create_engine(DATABASE_URL, pool_pre_ping=True)
metadata = MetaData()

jobs = Table(
    "jobs",
    metadata,
    Column("id", String(36), primary_key=True),
    Column("disc_type", String(16)),
    Column("device", String(64)),
    Column("title", String(255)),
    Column("status", String(16), nullable=False, server_default="pending"),
    Column("progress", Integer, nullable=False, server_default="0"),
    Column("output_path", Text),
    Column("target_dir", String(255)),
    Column("error", Text),
    Column("meta", Text),  # Disc-Metadaten (JSON: Jahr/Poster/Plot) für Detail-Popup + NFO
    Column("created_at", DateTime(timezone=True)),
    Column("finished_at", DateTime(timezone=True)),
)

logs = Table(
    "logs",
    metadata,
    Column("id", Integer, primary_key=True, autoincrement=True),
    Column("ts", DateTime(timezone=True)),
    Column("level", String(16)),
    Column("source", String(32)),
    Column("message", Text),
)

settings_table = Table(
    "settings",
    metadata,
    Column("key", String(64), primary_key=True),
    Column("value", Text),
)

workers = Table(
    "workers",
    metadata,
    Column("name", String(128), primary_key=True),
    Column("encoders", Text),
    Column("info", Text),  # Werkzeug-Versionen (JSON: makemkv/handbrake/key-Quelle)
    Column("last_seen", DateTime(timezone=True)),
)

storage_mounts = Table(
    "storage_mounts",
    metadata,
    Column("name", String(64), primary_key=True),
    Column("typ", String(8)),          # nfs | cifs
    Column("quelle", String(255)),     # host:/export bzw. //host/share
    Column("optionen", String(255)),
    Column("username", String(128)),
    Column("passwort", String(255)),   # Klartext — Heimnetz-Kompromiss, siehe README
)


def list_workers() -> list:
    import json

    with engine.connect() as conn:
        zeilen = conn.execute(select(workers)).mappings().all()
    ergebnis = []
    for z in zeilen:
        eintrag = dict(z)
        try:
            eintrag["encoders"] = json.loads(eintrag.get("encoders") or "[]")
        except ValueError:
            eintrag["encoders"] = []
        try:
            eintrag["info"] = json.loads(eintrag.get("info") or "{}")
        except ValueError:
            eintrag["info"] = {}
        if eintrag.get("last_seen"):
            eintrag["last_seen"] = eintrag["last_seen"].isoformat()
        ergebnis.append(eintrag)
    return ergebnis


def list_mounts() -> list:
    with engine.connect() as conn:
        return [dict(z) for z in conn.execute(select(storage_mounts)).mappings().all()]


def save_mount(name: str, typ: str, quelle: str, optionen: str, username: str, passwort: str) -> None:
    with engine.begin() as conn:
        conn.execute(
            storage_mounts.insert().values(
                name=name, typ=typ, quelle=quelle,
                optionen=optionen, username=username, passwort=passwort,
            )
        )


def delete_mount(name: str) -> None:
    with engine.begin() as conn:
        conn.execute(storage_mounts.delete().where(storage_mounts.c.name == name))


def utcnow() -> datetime:
    return datetime.now(timezone.utc)


def init_db() -> None:
    """Legt fehlende Tabellen an (idempotent) und zieht Mini-Migrationen nach."""
    metadata.create_all(engine)
    # create_all ändert BESTEHENDE Tabellen nicht — neue Spalten hier nachziehen:
    with engine.begin() as conn:
        conn.exec_driver_sql(
            "ALTER TABLE jobs ADD COLUMN IF NOT EXISTS target_dir VARCHAR(255)"
        )
        conn.exec_driver_sql(
            "ALTER TABLE jobs ADD COLUMN IF NOT EXISTS meta TEXT"
        )
        conn.exec_driver_sql(
            "ALTER TABLE workers ADD COLUMN IF NOT EXISTS info TEXT"
        )


def insert_job(
    job_id: str, device: str, disc_type: str = None, title: str = None,
    target_dir: str = None, meta: str = None,
) -> None:
    with engine.begin() as conn:
        conn.execute(
            jobs.insert().values(
                id=job_id,
                device=device,
                disc_type=disc_type,
                title=title,
                target_dir=target_dir,
                meta=meta,
                status="pending",
                progress=0,
                created_at=utcnow(),
            )
        )


def update_job(job_id: str, **fields) -> None:
    with engine.begin() as conn:
        conn.execute(jobs.update().where(jobs.c.id == job_id).values(**fields))


def get_job(job_id: str) -> dict:
    with engine.connect() as conn:
        zeile = conn.execute(
            select(jobs).where(jobs.c.id == job_id)
        ).mappings().first()
    return dict(zeile) if zeile else None


def list_jobs(limit: int = 100) -> list:
    with engine.connect() as conn:
        zeilen = conn.execute(
            select(jobs).order_by(jobs.c.created_at.desc()).limit(limit)
        ).mappings().all()
    return [dict(z) for z in zeilen]


def delete_job(job_id: str) -> None:
    """Entfernt EINEN Job-Eintrag (nur die DB-Zeile — Dateien bleiben)."""
    with engine.begin() as conn:
        conn.execute(jobs.delete().where(jobs.c.id == job_id))


def delete_finished_jobs() -> int:
    """Räumt alle erledigten Jobs (completed/failed) aus der Liste. Dateien bleiben."""
    with engine.begin() as conn:
        ergebnis = conn.execute(
            jobs.delete().where(jobs.c.status.in_(("completed", "failed")))
        )
    return ergebnis.rowcount or 0


def delete_worker(name: str) -> None:
    """Entfernt einen (verwaisten) Worker-Eintrag aus der Liste."""
    with engine.begin() as conn:
        conn.execute(workers.delete().where(workers.c.name == name))


def has_active_job(device: str) -> bool:
    """True, wenn auf dem Gerät ein Job läuft oder wartet (Eject-Schutz)."""
    with engine.connect() as conn:
        zeile = conn.execute(
            select(jobs.c.id)
            .where(jobs.c.device == device)
            .where(jobs.c.status.in_(("pending", "running")))
            .limit(1)
        ).first()
    return zeile is not None


def add_log(level: str, source: str, message: str) -> None:
    with engine.begin() as conn:
        conn.execute(
            logs.insert().values(ts=utcnow(), level=level, source=source, message=message)
        )


def list_logs(limit: int = 200) -> list:
    with engine.connect() as conn:
        zeilen = conn.execute(
            select(logs).order_by(logs.c.id.desc()).limit(limit)
        ).mappings().all()
    return [dict(z) for z in zeilen]


def get_settings(key: str = "ui") -> dict:
    with engine.connect() as conn:
        zeile = conn.execute(
            select(settings_table.c.value).where(settings_table.c.key == key)
        ).first()
    if not zeile or not zeile[0]:
        return {}
    try:
        return json.loads(zeile[0])
    except ValueError:
        return {}


def save_settings(werte: dict, key: str = "ui") -> None:
    payload = json.dumps(werte)
    with engine.begin() as conn:
        vorhanden = conn.execute(
            select(settings_table.c.key).where(settings_table.c.key == key)
        ).first()
        if vorhanden:
            conn.execute(
                settings_table.update()
                .where(settings_table.c.key == key)
                .values(value=payload)
            )
        else:
            conn.execute(settings_table.insert().values(key=key, value=payload))