using System;
using System.Net.Http;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Http;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Polly.Simmy;

using service;

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.
var services = builder.Services;
services.AddRequestTimeouts();
// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
services.AddEndpointsApiExplorer();
services.AddSwaggerGen();
services.AddDbContext<AppDbContext>(optionsBuilder =>
{
    // Configure the database connection string.
    var connectionString = builder.Configuration.GetValue<string>("PostgresConnection");
    Console.WriteLine($"Connecting to PostgreSQL database with connection string: {connectionString}");
    optionsBuilder.UseNpgsql(connectionString);
});
var httpClientBuilder = services.AddHttpClient<JsonPlaceholderClient>();

#region Exercise Phase 4

httpClientBuilder.AddResilienceHandler("chaos", configure =>
{
    // Simulate network chaos by adding latency and random errors.
    configure
        .AddChaosLatency(0.10, TimeSpan.FromSeconds(3))
        .AddChaosOutcome(0.15, () => new HttpResponseMessage(System.Net.HttpStatusCode.BadGateway))
        .AddChaosOutcome(0.20, () => new HttpResponseMessage(System.Net.HttpStatusCode.ServiceUnavailable))
        .AddChaosOutcome(0.10, () =>
        {
            Thread.Sleep(TimeSpan.FromSeconds(2)); // Delay the error response, as it would likely happen with a 504.
            return new HttpResponseMessage(System.Net.HttpStatusCode.GatewayTimeout);
        });
});

#endregion

var app = builder.Build();
app.UseSwagger();
app.UseSwaggerUI(); // Swagger UI is available at http://localhost:8080/swagger/index.html
app.UseRequestTimeouts();

app.MapGet("/posts/{id}", async (AppDbContext dbContext, JsonPlaceholderClient client, int id) =>
{
    // TODO: (Phase 1) Implement the logic to retrieve a post by ID and store it in the database.
    // Consider some minimal error handling in case the post is not found (e.g. Id > 100).
    return Results.Ok();
})
.WithRequestTimeout(TimeSpan.FromSeconds(29))
.WithName("GetPostById")
.WithOpenApi();

app.Run();