"""Check if a supply_contract exists for supplier_id. If not, create one."""
supplier_id = params_kw.get('supplier_id')
if not supplier_id:
    return {'widgettype': 'Error', 'options': {'title': 'Error', 'message': 'Missing supplier_id', 'timeout': 3}}

userorgid = await get_userorgid()
if not userorgid:
    return {'widgettype': 'Error', 'options': {'title': 'Auth Error', 'message': 'Please login', 'timeout': 3}}

dbname = get_module_dbname('supplychain')
async with DBPools().sqlorContext(dbname) as sor:
    # Check existing
    recs = await sor.sqlExe(
        'SELECT id, contract_code, contract_name FROM supply_contracts WHERE supplier_id = ${sid}$ AND resellerid = ${rid}$ AND status = ${st}$',
        {'sid': supplier_id, 'rid': userorgid, 'st': '1'}
    )
    if recs:
        r = recs[0]
        return {
            'widgettype': 'Message',
            'options': {
                'title': '协议已存在',
                'message': f'供销协议 {r.contract_code} {r.contract_name} 已存在',
                'type': 'success',
                'timeout': 3
            }
        }

    # Get supplier name
    sub = await sor.sqlExe(
        'SELECT supplier_name FROM suppliers WHERE id = ${sid}$',
        {'sid': supplier_id}
    )
    sup_name = sub[0].supplier_name if sub else supplier_id

    # Generate contract_code
    prefix = f"SC-{datetime.datetime.now().strftime('%Y%m%d')}"
    cnt_recs = await sor.sqlExe(
        'SELECT COUNT(*) as cnt FROM supply_contracts WHERE resellerid = ${rid}$ AND contract_code LIKE ${p}$',
        {'rid': userorgid, 'p': prefix + '%'}
    )
    seq = (cnt_recs[0].cnt if cnt_recs else 0) + 1
    contract_code = f"{prefix}-{seq:04d}"

    now = timestampstr()
    contract_id = getID()
    await sor.C('supply_contracts', {
        'id': contract_id,
        'resellerid': userorgid,
        'supplier_id': supplier_id,
        'contract_code': contract_code,
        'contract_name': f'{sup_name}供销协议',
        'start_date': curDateString(),
        'status': '1',
        'default_discount': '1.0000',
        'created_by': userorgid,
        'created_at': now,
        'updated_at': now,
    })

    return {
        'widgettype': 'Message',
        'options': {
            'title': '创建成功',
            'message': f'已为{sup_name}创建供销协议 {contract_code}',
            'type': 'success',
            'timeout': 5
        }
    }