using Microsoft.AspNetCore.Mvc;
using Tiku.Application.Auth;

namespace Tiku.Api.Middleware;

public sealed class ExceptionHandlingMiddleware(
    RequestDelegate next,
    ILogger<ExceptionHandlingMiddleware> logger,
    IHostEnvironment environment)
{
    public async Task InvokeAsync(HttpContext context)
    {
        try
        {
            await next(context);
        }
        catch (Exception exception)
        {
            if (exception is AuthException authException)
            {
                await WriteAuthProblemAsync(context, authException);
                return;
            }

            logger.LogError(exception, "Unhandled API exception");

            var problem = new ProblemDetails
            {
                Title = "An unexpected error occurred.",
                Status = StatusCodes.Status500InternalServerError,
                Detail = environment.IsDevelopment() ? exception.Message : null,
                Instance = context.Request.Path
            };

            problem.Extensions["traceId"] = context.TraceIdentifier;
            context.Response.StatusCode = StatusCodes.Status500InternalServerError;
            await context.Response.WriteAsJsonAsync(problem);
        }
    }

    private static async Task WriteAuthProblemAsync(HttpContext context, AuthException exception)
    {
        var status = exception.Code switch
        {
            "tenant_access_denied" => StatusCodes.Status403Forbidden,
            "sms_rate_limited" => StatusCodes.Status429TooManyRequests,
            "auth_provider_not_configured" => StatusCodes.Status503ServiceUnavailable,
            "session_revoked" => StatusCodes.Status401Unauthorized,
            _ => StatusCodes.Status401Unauthorized
        };
        var problem = new ProblemDetails
        {
            Title = exception.Message,
            Status = status,
            Instance = context.Request.Path
        };

        problem.Extensions["code"] = exception.Code;
        problem.Extensions["traceId"] = context.TraceIdentifier;
        context.Response.StatusCode = status;
        await context.Response.WriteAsJsonAsync(problem);
    }
}