"""
Migration idempotente per sandbox.
Base.metadata.create_all() crea solo tabelle mancanti, non colonne aggiuntive.
Qui gestiamo ALTER TABLE ADD COLUMN IF NOT EXISTS per l'evoluzione dello schema.

Ogni migration è una stringa SQL che puo essere eseguita piu volte senza errori.
"""
from sqlalchemy import text
import logging

log = logging.getLogger("rendicontazione-api.migrations")


MIGRATIONS = [
    # 2026-04-18: colonne file upload su remission_invoice
    """
    ALTER TABLE gepafin_rendic.remission_invoice
        ADD COLUMN IF NOT EXISTS storage_path varchar(1024),
        ADD COLUMN IF NOT EXISTS mime varchar(128),
        ADD COLUMN IF NOT EXISTS size_bytes bigint,
        ADD COLUMN IF NOT EXISTS sha256 varchar(64),
        ADD COLUMN IF NOT EXISTS uploaded_by integer,
        ADD COLUMN IF NOT EXISTS uploaded_at timestamptz;
    """,
    # 2026-04-18: colonne file upload su remission_ula_employee
    """
    ALTER TABLE gepafin_rendic.remission_ula_employee
        ADD COLUMN IF NOT EXISTS storage_path varchar(1024),
        ADD COLUMN IF NOT EXISTS mime varchar(128),
        ADD COLUMN IF NOT EXISTS size_bytes bigint,
        ADD COLUMN IF NOT EXISTS sha256 varchar(64),
        ADD COLUMN IF NOT EXISTS uploaded_by integer,
        ADD COLUMN IF NOT EXISTS uploaded_at timestamptz;
    """,
    # 2026-04-18: colonne file upload su remission_document
    """
    ALTER TABLE gepafin_rendic.remission_document
        ADD COLUMN IF NOT EXISTS storage_path varchar(1024),
        ADD COLUMN IF NOT EXISTS mime varchar(128),
        ADD COLUMN IF NOT EXISTS size_bytes bigint,
        ADD COLUMN IF NOT EXISTS sha256 varchar(64),
        ADD COLUMN IF NOT EXISTS uploaded_by integer;
    """,
]


def run_migrations(engine) -> None:
    """Esegue tutte le migration in transazione. Log su ciascuna."""
    with engine.begin() as conn:
        for i, sql in enumerate(MIGRATIONS, 1):
            try:
                conn.execute(text(sql))
                log.info(f"migration {i}/{len(MIGRATIONS)} OK")
            except Exception as e:
                log.error(f"migration {i} FAILED: {e}")
                raise