using System;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Configuration;
using Bit.Core;
using Bit.Core.Utilities;
using Serilog.Events;
using AspNetCoreRateLimit;

namespace Bit.Identity
{
    public class Startup
    {
        public Startup(IHostingEnvironment env, IConfiguration configuration)
        {
            Configuration = configuration;
            Environment = env;
        }

        public IConfiguration Configuration { get; private set; }
        public IHostingEnvironment Environment { get; set; }

        public void ConfigureServices(IServiceCollection services)
        {
            // Options
            services.AddOptions();

            // Settings
            var globalSettings = services.AddGlobalSettingsServices(Configuration);
            if(!globalSettings.SelfHosted)
            {
                services.Configure<IpRateLimitOptions>(Configuration.GetSection("IpRateLimitOptions"));
                services.Configure<IpRateLimitPolicies>(Configuration.GetSection("IpRateLimitPolicies"));
            }

            // Data Protection
            services.AddCustomDataProtectionServices(Environment, globalSettings);

            // Repositories
            services.AddSqlServerRepositories(globalSettings);

            // Context
            services.AddScoped<CurrentContext>();

            // Caching
            services.AddMemoryCache();

            if(!globalSettings.SelfHosted)
            {
                // Rate limiting
                services.AddSingleton<IIpPolicyStore, MemoryCacheIpPolicyStore>();
                services.AddSingleton<IRateLimitCounterStore, MemoryCacheRateLimitCounterStore>();
            }

            // IdentityServer
            services.AddCustomIdentityServerServices(Environment, globalSettings);

            // Identity
            services.AddCustomIdentityServices(globalSettings);

            // Services
            services.AddBaseServices();
            services.AddDefaultServices(globalSettings);
        }

        public void Configure(
            IApplicationBuilder app,
            IHostingEnvironment env,
            ILoggerFactory loggerFactory,
            IApplicationLifetime appLifetime,
            GlobalSettings globalSettings)
        {
            loggerFactory.AddSerilog(env, appLifetime, globalSettings, (e) =>
            {
                var context = e.Properties["SourceContext"].ToString();
                if(context.Contains("IdentityServer4.Validation.TokenValidator") ||
                    context.Contains("IdentityServer4.Validation.TokenRequestValidator"))
                {
                    return e.Level > LogEventLevel.Error;
                }

                if(context.Contains(typeof(IpRateLimitMiddleware).FullName) && e.Level == LogEventLevel.Information)
                {
                    return true;
                }

                return e.Level >= LogEventLevel.Error;
            });

            // Default Middleware
            app.UseDefaultMiddleware(env);

            if(!globalSettings.SelfHosted)
            {
                // Rate limiting
                app.UseMiddleware<CustomIpRateLimitMiddleware>();
            }

            // Add current context
            app.UseMiddleware<CurrentContextMiddleware>();

            // Add IdentityServer to the request pipeline.
            app.UseIdentityServer();
        }
    }
}