using Microsoft.AspNetCore.Authentication.Cookies;
using Microsoft.AspNetCore.Authentication.Google;
using Microsoft.AspNetCore.Authorization;
using Microsoft.Extensions.Http.Resilience;
using Polly;
using System.Net;
using System.Security.Claims;
using ShiftScheduler.Services;
using ShiftScheduler.Shared;

var builder = WebApplication.CreateBuilder(args);

// Load configurations from appsettings.json
var shifts = builder.Configuration.GetSection("Shifts").Get<List<Shift>>() ?? new();
var transportConfig = builder.Configuration.GetSection("Transport").Get<TransportConfiguration>() ?? new();
var authorizedEmails = builder.Configuration.GetSection("Authentication:AuthorizedEmails").Get<List<string>>() ?? new();

// Create application configuration
var appConfiguration = new ApplicationConfiguration
{
    Transport = transportConfig,
    Shifts = shifts
};

// Register services
builder.Services.AddSingleton(authorizedEmails);
builder.Services.AddSingleton<IConfigurationService>(new ConfigurationService(appConfiguration));
builder.Services.AddMemoryCache();
builder.Services.AddHttpClient<TransportApiService>();
builder.Services.AddHttpClient("nextcloud")
    .AddResilienceHandler("nextcloud-retry", pipeline =>
    {
        pipeline.AddRetry(new HttpRetryStrategyOptions
        {
            MaxRetryAttempts = 3,
            Delay = TimeSpan.FromSeconds(2),
            BackoffType = DelayBackoffType.Exponential,
            ShouldHandle = args => ValueTask.FromResult(
                args.Outcome.Result?.StatusCode == HttpStatusCode.TooManyRequests)
        });
    });
builder.Services.AddSingleton<IcsExportService>();
builder.Services.AddSingleton<PdfExportService>();
builder.Services.AddSingleton<ITransportApiService, TransportApiService>();
builder.Services.AddSingleton<ITransportService, TransportService>();
builder.Services.AddHttpContextAccessor();
builder.Services.AddScoped<IGoogleCalendarService, GoogleCalendarService>();
builder.Services.AddScoped<INextcloudCalendarService, NextcloudCalendarService>();

// Configure authentication
builder.Services.AddAuthentication(options =>
{
    options.DefaultScheme = CookieAuthenticationDefaults.AuthenticationScheme;
    options.DefaultChallengeScheme = GoogleDefaults.AuthenticationScheme;
})
.AddCookie(options =>
{
    options.LoginPath = "/api/auth/login";
    options.LogoutPath = "/api/auth/logout";
    options.AccessDeniedPath = "/";
    options.ExpireTimeSpan = TimeSpan.FromDays(7);
    options.SlidingExpiration = true;
    options.Cookie.SameSite = SameSiteMode.Lax;
    options.Cookie.SecurePolicy = CookieSecurePolicy.SameAsRequest;
})
.AddGoogle(googleOptions =>
{
    googleOptions.ClientId = builder.Configuration["Authentication:Google:ClientId"] ?? "";
    googleOptions.ClientSecret = builder.Configuration["Authentication:Google:ClientSecret"] ?? "";
    googleOptions.CallbackPath = "/signin-google";
    googleOptions.SaveTokens = true;
    googleOptions.Scope.Add("https://www.googleapis.com/auth/calendar");
    googleOptions.Events.OnTicketReceived = async context =>
    {
        var emailClaim = context.Principal?.FindFirst(ClaimTypes.Email) ??
                        context.Principal?.FindFirst("email");
        
        if (emailClaim?.Value == null || !authorizedEmails.Contains(emailClaim.Value))
        {
            context.Fail("Email not authorized");
            context.Response.Redirect("/?error=unauthorized");
            return;
        }
        
        await Task.CompletedTask;
    };
});

// Configure authorization policy for allowed emails
builder.Services.AddAuthorization(options =>
{
    options.AddPolicy("AllowedEmails", policy =>
        policy.RequireAssertion(context =>
        {
            var emailClaim = context.User.FindFirst(ClaimTypes.Email) ??
                           context.User.FindFirst("email");
            if (emailClaim?.Value != null)
            {
                return authorizedEmails.Contains(emailClaim.Value);
            }
            return false;
        }));
});

builder.Services.AddControllersWithViews();
builder.Services.AddRazorPages();

var app = builder.Build();

// Configure the HTTP request pipeline.
if (app.Environment.IsDevelopment())
{
    app.UseWebAssemblyDebugging();
}
else
{
    app.UseExceptionHandler("/Error");
    // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
    app.UseHsts();
}

app.UseHttpsRedirection();

app.UseBlazorFrameworkFiles();
app.UseStaticFiles();

var iconsPath = Path.Combine(Directory.GetCurrentDirectory(), "config", "icons");
Directory.CreateDirectory(iconsPath);
app.UseStaticFiles(new StaticFileOptions
{
    FileProvider = new Microsoft.Extensions.FileProviders.PhysicalFileProvider(iconsPath),
    RequestPath = "/icons"
});

app.UseRouting();

app.UseAuthentication();
app.UseAuthorization();


app.MapRazorPages();
app.MapControllers();
app.MapFallbackToFile("index.html");

app.Run();