namespace CareFix.Api.Infrastructure;

/// <summary>An error whose message is safe to show to the user.</summary>
public sealed class AppException(int status, string message, string? code = null) : Exception(message)
{
    public int Status { get; } = status;
    public string? Code { get; } = code;

    public static AppException BadRequest(string m) => new(400, m);
    public static AppException NotFound(string m) => new(404, m);
    public static AppException Forbidden(string m) => new(403, m);
    public static AppException Conflict(string m) => new(409, m);
}

public sealed class ErrorMiddleware(RequestDelegate next, ILogger<ErrorMiddleware> log)
{
    public async Task Invoke(HttpContext ctx)
    {
        try
        {
            await next(ctx);
        }
        catch (AppException ex)
        {
            if (ctx.Response.HasStarted) throw;
            ctx.Response.StatusCode = ex.Status;
            await ctx.Response.WriteAsJsonAsync(new { error = ex.Message, code = ex.Code });
        }
        catch (CareFix.Core.OpsException ex)
        {
            if (ctx.Response.HasStarted) throw;
            ctx.Response.StatusCode = ex.Status;
            await ctx.Response.WriteAsJsonAsync(new { error = ex.Message });
        }
        catch (Exception ex)
        {
            log.LogError(ex, "Unhandled error on {Path}", ctx.Request.Path);
            if (ctx.Response.HasStarted) throw;
            ctx.Response.StatusCode = 500;
            await ctx.Response.WriteAsJsonAsync(new { error = "Unexpected server error. The details are in the server log." });
        }
    }
}