"""queries/db.py — helper condiviso per query SQLite"""

import sqlite3
from datetime import datetime


def query(db_path: str, sql: str, params: tuple = ()) -> list:
    conn = sqlite3.connect(db_path)
    conn.row_factory = sqlite3.Row
    try:
        cur = conn.cursor()
        cur.execute(sql, params)
        return [dict(r) for r in cur.fetchall()]
    finally:
        conn.close()


def count(db_path: str, sql: str) -> int:
    rows = query(db_path, sql)
    return rows[0]['n'] if rows else 0


# ------------------------------------------------------------------ HTML utils

def e(v) -> str:
    if v is None: return '-'
    return str(v).replace('&','&amp;').replace('<','&lt;').replace('>','&gt;').replace('"','&quot;')

def dt(v) -> str:
    if not v: return '-'
    try:
        return datetime.fromisoformat(str(v)).strftime('%d/%m/%Y %H:%M:%S')
    except Exception:
        return str(v)

def d(v) -> str:
    if not v: return '-'
    try:
        return datetime.fromisoformat(str(v)).strftime('%d/%m/%Y')
    except Exception:
        return str(v)

def dur(start, finish) -> str:
    if not start or not finish: return '-'
    try:
        s = int((datetime.fromisoformat(str(finish)) - datetime.fromisoformat(str(start))).total_seconds())
        return f"{s//60}m {s%60}s" if s >= 60 else f"{s}s"
    except Exception:
        return '-'

def badge(cls: str, text: str) -> str:
    return f'<span class="badge {cls}">{text}</span>'


def detect_db(db_path: str) -> 'DbType':
    """Returns DB_TYPE_REG_LOMB, DB_TYPE_INTRAZ, or DB_TYPE_UNKNOWN based on DB schema.

    reg_Lomb (db_reg_lombardia)       → has table 'sessione_documenti'
    Intraz   (db_corsi_intraziendali) → has table 'rpa_intra_api_iscrizione'
    """
    from ..config import DbType
    rows = query(db_path, "SELECT name FROM sqlite_master WHERE type='table'")
    tables = {r['name'] for r in rows}
    if 'sessione_documenti' in tables:
        return DbType.REG_LOMB
    if 'rpa_intra_api_iscrizione' in tables:
        return DbType.INTRAZ
    return DbType.UNKNOWN