from __future__ import annotations
from .shared import Any, VALID_ACCOUNT_TYPES, db, fail, new_id, normalize_liquidity_bucket, normalize_statement_status, now_iso, ok, row_to_dict


def _record_balance_candidate(conn: Any, account: dict[str, Any], balance: Any = None, synced: str | None = None) -> None:
    balance = account.get("last_balance") if balance is None else balance
    synced = account.get("last_synced_at") if synced is None else synced
    if balance is None or not str(synced or ""):
        return
    try:
        from .account_valuation_service import record_account_valuation_candidate
        record_account_valuation_candidate(conn, account["id"], str(synced), int(balance), account.get("currency", "KRW"), "account_write", account.get("updated_at", ""), f"account-balance:{account['id']}:{str(synced)[:10]}:{balance}", "account balance write candidate")
    except (ValueError, TypeError):
        return


def create_ledger_account(name: str, type: str = "bank", institution: str = "", currency: str = "KRW", active: bool = True, memo: str = "", account_number_masked: str = "", holder_name: str = "", last_balance: int | None = None, last_synced_at: str = "", statement_status: str = "unknown", liquidity_bucket: str = "other", db_path: str | None = None) -> dict[str, Any]:
    if not name.strip(): return fail("validation_error", "account name is required")
    if type not in VALID_ACCOUNT_TYPES: return fail("validation_error", f"type must be one of {sorted(VALID_ACCOUNT_TYPES)}")
    try:
        statement_status_norm = normalize_statement_status(statement_status)
        liquidity_bucket_norm = normalize_liquidity_bucket(liquidity_bucket)
    except Exception as e: return fail("validation_error", str(e))
    ts = now_iso(); account_id = new_id("acct")
    with db(db_path) as conn:
        conn.execute("INSERT INTO accounts(id,name,type,institution,currency,active,memo,account_number_masked,holder_name,last_balance,last_synced_at,statement_status,liquidity_bucket,created_at,updated_at) VALUES(?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)", (account_id,name.strip(),type,institution,currency.upper(),int(active),memo,account_number_masked,holder_name,last_balance,last_synced_at,statement_status_norm,liquidity_bucket_norm,ts,ts))
        row = conn.execute("SELECT * FROM accounts WHERE id=?", (account_id,)).fetchone()
        account = row_to_dict(row)
        _record_balance_candidate(conn, account)
    return ok(account=account)


def update_ledger_account(account_id: str, db_path: str | None = None, **fields: Any) -> dict[str, Any]:
    allowed = {"name","type","institution","currency","active","memo","account_number_masked","holder_name","last_balance","last_synced_at","statement_status","liquidity_bucket"}
    with db(db_path) as conn:
        current = conn.execute("SELECT * FROM accounts WHERE id=?", (account_id,)).fetchone()
        if current is None: return fail("not_found", "account not found")
        updates=[]; params=[]
        for k,v in fields.items():
            if k not in allowed or v is None: continue
            try:
                if k == "type" and v not in VALID_ACCOUNT_TYPES: return fail("validation_error", f"type must be one of {sorted(VALID_ACCOUNT_TYPES)}")
                if k == "statement_status": v = normalize_statement_status(str(v))
                if k == "liquidity_bucket": v = normalize_liquidity_bucket(str(v))
                if k == "active": v = int(bool(v))
                if k == "last_balance" and v != "": v = int(v)
                if k == "currency": v = str(v).upper()
            except Exception as e: return fail("validation_error", str(e))
            updates.append(f"{k}=?"); params.append(v)
        if not updates: return fail("validation_error", "no fields to update")
        incoming_date = str(fields.get("last_synced_at") or current["last_synced_at"] or "")[:10]
        stored_date = str(current["last_synced_at"] or "")[:10]
        historical = bool(incoming_date and stored_date and incoming_date < stored_date)
        candidate_balance = fields.get("last_balance", current["last_balance"])
        candidate_date = fields.get("last_synced_at", current["last_synced_at"])
        if historical:
            kept=[(u,p) for u,p in zip(updates,params) if not u.startswith(("last_balance=","last_synced_at="))]
            updates=[u for u,_ in kept]; params=[p for _,p in kept]
        updates.append("updated_at=?"); params.extend([now_iso(), account_id])
        conn.execute(f"UPDATE accounts SET {', '.join(updates)} WHERE id=?", params)
        row = conn.execute("SELECT * FROM accounts WHERE id=?", (account_id,)).fetchone()
        account = row_to_dict(row)
        if any(k in fields for k in ("last_balance", "last_synced_at")):
            _record_balance_candidate(conn, account, candidate_balance, candidate_date)
    return ok(account=account)