import { Code } from '../code.js';
import { ConnectError } from '../connect-error.js';

// Copyright 2021-2024 The Connect Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/**
 * Parse a gRPC Timeout (Deadline) header.
 *
 * @private Internal code, does not follow semantic versioning.
 */
function parseTimeout(value, maxTimeoutMs) {
    if (value === null) {
        return {};
    }
    const results = /^(\d{1,8})([HMSmun])$/.exec(value);
    if (results === null) {
        return {
            error: new ConnectError(`protocol error: invalid grpc timeout value: ${value}`, Code.InvalidArgument),
        };
    }
    const unitToMultiplicand = {
        H: 60 * 60 * 1000, // hour
        M: 60 * 1000, // minute
        S: 1000, // second
        m: 1, // millisecond
        u: 0.001, // microsecond
        n: 0.000001, // nanosecond
    };
    const timeoutMs = unitToMultiplicand[results[2]] *
        parseInt(results[1]);
    if (timeoutMs > maxTimeoutMs) {
        return {
            timeoutMs: timeoutMs,
            error: new ConnectError(`timeout ${timeoutMs}ms must be <= ${maxTimeoutMs}`, Code.InvalidArgument),
        };
    }
    return {
        timeoutMs,
    };
}

export { parseTimeout };
