using MailSharp.MailClient.Extensions;
using MailSharp.MailClient.Models;
using MailSharp.MailClient.Services;
using MailSharp.MailClient.Services.Logging;
using Microsoft.Extensions.Logging;
using System.Text.Json.Serialization;

var builder = WebApplication.CreateBuilder(args);

builder.Services.Configure<MailSettings>(builder.Configuration.GetSection("MailSettings"));
var mailSettings = builder.Configuration.GetSection("MailSettings").Get<MailSettings>() ?? new MailSettings();

builder.Services.AddControllersWithViews(options =>
{
    // Cc/Bcc and similar optional string fields on request DTOs (e.g. ComposeModel) are non-nullable
    // reference types with a "" default, not [Required] - without this, MVC's implicit-required
    // validation for non-nullable reference types rejects them whenever the form posts an empty value.
    options.SuppressImplicitRequiredAttributeForNonNullableReferenceTypes = true;
}).AddJsonOptions(options =>
{
    options.JsonSerializerOptions.Converters.Add(new JsonStringEnumConverter());
});
builder.Services.AddHttpContextAccessor();
builder.Services.AddMailSharpAuthentication(mailSettings);

builder.Services.AddHttpClient("ImageDownload", client =>
{
    client.Timeout = TimeSpan.FromSeconds(10);
    client.DefaultRequestHeaders.UserAgent.ParseAdd("MailSharp/1.0");
});

builder.Services.AddSingleton<IPasswordProtector, AesPasswordProtector>();
builder.Services.AddSingleton<IAccountStore, LiteDbAccountStore>();
builder.Services.AddSingleton<IMailCacheStore, LiteDbMailCacheStore>();
builder.Services.AddSingleton<IContactStore, LiteDbContactStore>();
builder.Services.AddSingleton<IFolderSettingsStore, LiteDbFolderSettingsStore>();
builder.Services.AddSingleton<IMessageIndexStore, LiteDbMessageIndexStore>();
builder.Services.AddSingleton<ILogStore, LiteDbLogStore>();
builder.Services.AddSingleton<IBackgroundIndexingStatus, BackgroundIndexingStatus>();
builder.Services.AddScoped<IImapService, ImapService>();
builder.Services.AddScoped<ISmtpService, SmtpService>();
builder.Services.AddScoped<SessionAccountManager>();
builder.Services.AddScoped<LocalizationService>();
builder.Services.AddScoped<ImageSanitizer>();
builder.Services.AddHostedService<LogPruningService>();

// Persists every log entry to LiteDB (see LiteDbLogStore) alongside the default console provider,
// so logs survive an app restart / running as a Windows Service and are visible on the Maintenance
// page - registered on the logging builder's own service collection (shares the same DI container
// as builder.Services) so the provider can resolve ILogStore via normal constructor injection.
builder.Logging.Services.AddSingleton<ILoggerProvider, LiteDbLoggerProvider>();

var app = builder.Build();

// One-time upgrade path for installs that predate the IsAdmin field: if there's exactly one
// account and nobody is an admin yet, that account is the obvious sole candidate - promote it
// automatically so there's no separate manual step. Installs with multiple accounts and no admin
// still need the explicit claim-admin bootstrap (see SettingsApiController.ClaimAdmin), since it's
// not obvious which of several accounts should get the promotion.
using (var scope = app.Services.CreateScope())
{
	var accountStore = scope.ServiceProvider.GetRequiredService<IAccountStore>();
	var accounts = accountStore.GetAll();
	if (accounts.Count == 1 && !accounts[0].IsAdmin)
	{
		accounts[0].IsAdmin = true;
		accountStore.Update(accounts[0]);
	}
}

if (!app.Environment.IsDevelopment())
{
    app.UseHsts();
}

app.UseHttpsRedirection();
app.UseStaticFiles();
app.UseRouting();

// No separate CSRF header check needed: the auth cookie is SameSite=Lax, so it is never sent
// on a cross-site POST (the classic CSRF vector) - a forged request from another site simply
// arrives unauthenticated and gets rejected by RequireAuthorization() below.
app.UseAuthentication();
app.UseAuthorization();

// All API controllers require a logged-in account by default; the few endpoints that must stay
// reachable while logged out (auth/state, login, login-defaults, and the whole language
// controller) are marked [AllowAnonymous] explicitly.
app.MapControllers().RequireAuthorization();
app.MapControllerRoute(
    name: "default",
    pattern: "{controller=Mail}/{action=Index}/{id?}");

await app.RunAsync();