using System.Text.Json;
using Gott.Services;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Routing;

namespace Gott.Endpoints;

public static class AuthEndpoint
{
    public static void MapAuthEndpoints(this WebApplication app)
    {
        app.MapPost("/api/auth/login", HandleLogin);
        app.MapPost("/api/auth/logout", HandleLogout);
        app.MapGet("/api/auth/me", HandleMe);
    }

    private static async System.Threading.Tasks.Task HandleLogin(HttpContext ctx, DatabaseService db, AuthService auth)
    {
        var body = await JsonSerializer.DeserializeAsync<JsonElement>(ctx.Request.Body);
        var username = body.TryGetProperty("username", out var u) ? u.GetString() : null;
        var password = body.TryGetProperty("password", out var p) ? p.GetString() : null;

        if (string.IsNullOrEmpty(username) || string.IsNullOrEmpty(password))
        {
            ctx.Response.StatusCode = 400;
            await ctx.Response.WriteAsJsonAsync(new { error = "Username and password required" });
            return;
        }

        var user = await db.GetUserByUsername(username);
        if (user == null || !auth.VerifyPassword(password, user.PasswordHash))
        {
            ctx.Response.StatusCode = 401;
            await ctx.Response.WriteAsJsonAsync(new { error = "Invalid credentials" });
            return;
        }

        var token = auth.CreateToken(user.UserId);

        ctx.Response.Cookies.Append("gott_token", token, new CookieOptions
        {
            HttpOnly = true,
            SameSite = SameSiteMode.Strict,
            Path = "/",
            MaxAge = System.TimeSpan.FromDays(365)
        });

        await ctx.Response.WriteAsJsonAsync(new
        {
            userId = user.UserId,
            username = user.Username,
            displayName = user.DisplayName,
            isAdmin = user.IsAdmin
        });
    }

    private static async System.Threading.Tasks.Task HandleLogout(HttpContext ctx, AuthService auth)
    {
        var token = ctx.Request.Cookies["gott_token"];
        auth.RevokeToken(token);

        ctx.Response.Cookies.Delete("gott_token", new CookieOptions
        {
            Path = "/"
        });

        await ctx.Response.WriteAsJsonAsync(new { ok = true });
    }

    private static async System.Threading.Tasks.Task HandleMe(HttpContext ctx, DatabaseService db, AuthService auth)
    {
        var token = ctx.Request.Cookies["gott_token"];
        var userId = auth.ValidateToken(token);

        if (userId == null)
        {
            ctx.Response.StatusCode = 401;
            await ctx.Response.WriteAsJsonAsync(new { error = "Not authenticated" });
            return;
        }

        var user = await db.GetUser(userId);
        if (user == null)
        {
            ctx.Response.StatusCode = 401;
            await ctx.Response.WriteAsJsonAsync(new { error = "User not found" });
            return;
        }

        await ctx.Response.WriteAsJsonAsync(new
        {
            userId = user.UserId,
            username = user.Username,
            displayName = user.DisplayName,
            isAdmin = user.IsAdmin
        });
    }
}