#region Copyright notice and license
// Copyright 2015, Google Inc.
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//
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// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
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// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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#endregion

using System;
using System.Collections.Generic;
using System.Reactive.Linq;
using System.Threading.Tasks;
using Grpc.Core.Utils;

namespace math
{
    public static class MathExamples
    {
        public static void DivExample(MathGrpc.IMathServiceClient stub)
        {
            DivReply result = stub.Div(new DivArgs.Builder { Dividend = 10, Divisor = 3 }.Build());
            Console.WriteLine("Div Result: " + result);
        }

        public static async Task DivAsyncExample(MathGrpc.IMathServiceClient stub)
        {
            Task<DivReply> resultTask = stub.DivAsync(new DivArgs.Builder { Dividend = 4, Divisor = 5 }.Build());
            DivReply result = await resultTask;
            Console.WriteLine("DivAsync Result: " + result);
        }

        public static async Task DivAsyncWithCancellationExample(MathGrpc.IMathServiceClient stub)
        {
            Task<DivReply> resultTask = stub.DivAsync(new DivArgs.Builder { Dividend = 4, Divisor = 5 }.Build());
            DivReply result = await resultTask;
            Console.WriteLine(result);
        }

        public static async Task FibExample(MathGrpc.IMathServiceClient stub)
        {
            var recorder = new RecordingObserver<Num>();
            stub.Fib(new FibArgs.Builder { Limit = 5 }.Build(), recorder);
            List<Num> result = await recorder.ToList();
            Console.WriteLine("Fib Result: " + string.Join("|", result));
        }

        public static async Task SumExample(MathGrpc.IMathServiceClient stub)
        {
            var numbers = new List<Num>
            {
                new Num.Builder { Num_ = 1 }.Build(),
                new Num.Builder { Num_ = 2 }.Build(),
                new Num.Builder { Num_ = 3 }.Build()
            };

            var clientStreamingResult = stub.Sum();
            numbers.Subscribe(clientStreamingResult.Inputs);
            Console.WriteLine("Sum Result: " + await clientStreamingResult.Task);
        }

        public static async Task DivManyExample(MathGrpc.IMathServiceClient stub)
        {
            var divArgsList = new List<DivArgs>
            {
                new DivArgs.Builder { Dividend = 10, Divisor = 3 }.Build(),
                new DivArgs.Builder { Dividend = 100, Divisor = 21 }.Build(),
                new DivArgs.Builder { Dividend = 7, Divisor = 2 }.Build()
            };

            var recorder = new RecordingObserver<DivReply>();
            var inputs = stub.DivMany(recorder);
            divArgsList.Subscribe(inputs);
            var result = await recorder.ToList();
            Console.WriteLine("DivMany Result: " + string.Join("|", result));
        }

        public static async Task DependendRequestsExample(MathGrpc.IMathServiceClient stub)
        {
            var numbers = new List<Num>
            {
                new Num.Builder { Num_ = 1 }.Build(), 
                new Num.Builder { Num_ = 2 }.Build(),
                new Num.Builder { Num_ = 3 }.Build()
            };

            var clientStreamingResult = stub.Sum();
            numbers.Subscribe(clientStreamingResult.Inputs);
            Num sum = await clientStreamingResult.Task;

            DivReply result = await stub.DivAsync(new DivArgs.Builder { Dividend = sum.Num_, Divisor = numbers.Count }.Build());
            Console.WriteLine("Avg Result: " + result);
        }
    }
}