// Copyright 2020, OpenTelemetry 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.
//

import Foundation
import OpenTelemetryApi

public struct RandomIdGenerator: IdGenerator {
    public init() {}

    public func generateSpanId() -> SpanId {
        var id: UInt64
        repeat {
            id = UInt64.random(in: .min ... .max)
        } while id == SpanId.invalidId
        return SpanId(id: id)
    }

    public func generateTraceId() -> TraceId {
        var idHi: UInt64
        var idLo: UInt64
        repeat {
            idHi = UInt64.random(in: .min ... .max)
            idLo = UInt64.random(in: .min ... .max)
        } while idHi == TraceId.invalidId && idLo == TraceId.invalidId
        return TraceId(idHi: idHi, idLo: idLo)
    }
}
