using API.Data;
using API.GraphQL;
using API.Services;
using Microsoft.EntityFrameworkCore;
using Model;
using Npgsql;

var builder = WebApplication.CreateBuilder(args);

// Register HTTP Context Accessor and Token Service
builder.Services.AddHttpContextAccessor();
builder.Services.AddSingleton<ITokenService, TokenService>();

// Configure CORS for Web / Blazor WebAssembly client
builder.Services.AddCors(options =>
{
    options.AddDefaultPolicy(policy =>
    {
        policy.AllowAnyOrigin()
            .AllowAnyHeader()
            .AllowAnyMethod();
    });
});

var connectionString = builder.Configuration.GetConnectionString("DefaultConnection")
                       ?? builder.Configuration.GetConnectionString("Postgres")
                       ?? Environment.GetEnvironmentVariable("POSTGRES_CONNECTION_STRING");

var envPassword = Environment.GetEnvironmentVariable("PostgreSQL_Password")
                  ?? (OperatingSystem.IsWindows()
                      ? Environment.GetEnvironmentVariable("PostgreSQL_Password", EnvironmentVariableTarget.User)
                      : null)
                  ?? (OperatingSystem.IsWindows()
                      ? Environment.GetEnvironmentVariable("PostgreSQL_Password", EnvironmentVariableTarget.Machine)
                      : null)
                  ?? Environment.GetEnvironmentVariable("POSTGRESQL_PASSWORD")
                  ?? Environment.GetEnvironmentVariable("POSTGRES_PASSWORD");

if (!string.IsNullOrEmpty(connectionString))
{
    if (!string.IsNullOrEmpty(envPassword))
        try
        {
            var csb = new NpgsqlConnectionStringBuilder(connectionString)
            {
                Password = envPassword
            };
            connectionString = csb.ConnectionString;
        }
        catch
        {
        }
}
else if (!string.IsNullOrEmpty(envPassword))
{
    var csb = new NpgsqlConnectionStringBuilder
    {
        Host = "localhost",
        Database = "chrono",
        Username = "postgres",
        Password = envPassword
    };
    connectionString = csb.ConnectionString;
}

builder.Services.AddDbContext<AppDbContext>(options =>
{
    if (!string.IsNullOrEmpty(connectionString))
        options.UseNpgsql(connectionString);
    else
        options.UseInMemoryDatabase("chrono");
});

// Register Hot Chocolate GraphQL Server with Nitro GraphQL IDE support
builder.Services
    .AddGraphQLServer()
    .AddQueryType<Query>()
    .AddMutationType<Mutation>()
    .ModifyRequestOptions(opt => opt.IncludeExceptionDetails = builder.Environment.IsDevelopment());

var app = builder.Build();

using (var scope = app.Services.CreateScope())
{
    try
    {
        var db = scope.ServiceProvider.GetRequiredService<AppDbContext>();
        if (!string.IsNullOrEmpty(connectionString) && db.Database.IsNpgsql())
            db.Database.Migrate();
        else
            db.Database.EnsureCreated();

        // Seed default users if empty
        if (!db.Users.Any())
        {
            db.Users.AddRange(
                new User { Username = "admin", Password = "password123", CreatedAt = DateTime.UtcNow },
                new User { Username = "testuser", Password = "password123", CreatedAt = DateTime.UtcNow },
                new User { Username = "player1", Password = "password123", CreatedAt = DateTime.UtcNow }
            );
            db.SaveChanges();
        }
    }
    catch (Exception ex)
    {
        Console.WriteLine($"[WARNING] Database initialization failed: {ex.Message}. Continuing without DB connection.");
    }
}

app.UseCors();

// Map Hot Chocolate GraphQL endpoint and Nitro GraphQL Debugger
app.MapGraphQL();

app.MapGet("/", () => "Chrono CCG GraphQL API");

// REST Endpoints for Decks
app.MapGet("/api/decks", async (AppDbContext db) =>
{
    var decks = await db.UserDecks.OrderByDescending(d => d.UpdatedAt).ToListAsync();
    return Results.Ok(decks);
});

app.MapGet("/api/decks/{id:guid}", async (AppDbContext db, Guid id) =>
{
    var deck = await db.UserDecks.FindAsync(id);
    return deck != null ? Results.Ok(deck) : Results.NotFound();
});

app.MapPost("/api/decks", async (AppDbContext db, UserDeck input) =>
{
    var existing = await db.UserDecks.FindAsync(input.Id);
    if (existing == null)
    {
        input.UpdatedAt = DateTime.UtcNow;
        db.UserDecks.Add(input);
        await db.SaveChangesAsync();
        return Results.Ok(input);
    }
    existing.Name = input.Name;
    existing.Cards = input.Cards ?? [];
    existing.Divers = input.Divers ?? [];
    existing.Notes = input.Notes;
    existing.Season = input.Season;
    existing.UpdatedAt = DateTime.UtcNow;
    await db.SaveChangesAsync();
    return Results.Ok(existing);
});

app.MapDelete("/api/decks/{id:guid}", async (AppDbContext db, Guid id) =>
{
    var existing = await db.UserDecks.FindAsync(id);
    if (existing != null)
    {
        db.UserDecks.Remove(existing);
        await db.SaveChangesAsync();
        return Results.Ok(new { success = true });
    }
    return Results.NotFound();
});

// Authentication endpoints
app.MapPost("/api/auth/dev-login", async (AppDbContext db, ITokenService tokenService, HttpContext httpContext) =>
{
    var user = await db.Users.FirstOrDefaultAsync(u => u.Username == "testuser");
    if (user == null)
    {
        user = new User { Username = "testuser", Password = "password123", CreatedAt = DateTime.UtcNow };
        db.Users.Add(user);
        await db.SaveChangesAsync();
    }
    var token = tokenService.GenerateToken(user.Username);
    httpContext.Response.Cookies.Append("chrono_auth_token", token, new CookieOptions { Path = "/", SameSite = SameSiteMode.Lax });
    httpContext.Response.Cookies.Append("chrono_auth_user", user.Username, new CookieOptions { Path = "/", SameSite = SameSiteMode.Lax });
    return Results.Ok(new { success = true, token, username = user.Username });
});

app.MapDelete("/api/auth/credentials", () => Results.Ok(new { success = true }));

app.Run();