(** SPDX-License-Identifier: MPL-2.0 *)
(* SPDX-FileCopyrightText: 2026 Jonathan D.A. Jewell *)

(** Audio DSP Kernel (Stub)
    
    Placeholder for audio processing kernel.
    Will provide hardware-accelerated audio operations.
*)

open Ast
open Architecture

(** Audio Kernel Context *)
type kernel_context = {
  initialized : bool;
  sample_rate : int;
  channels : int;
  buffer_size : int;
  capabilities : string list;
}

(** Audio Kernel Implementation *)
module Audio_kernel : KERNEL = struct
  type kernel_context = kernel_context
  
  let initialize () : kernel_context = {
    initialized = false;
    sample_rate = 44100;
    channels = 2;
    buffer_size = 1024;
    capabilities = [
      "dsp";
      "effects";
      "mixing";
      "real_time";
    ];
  }
  
  let shutdown (ctx : kernel_context) : unit = 
    ()  (* TODO: Cleanup audio resources *)
  
  let is_available (ctx : kernel_context) : bool = 
    ctx.initialized
  
  let get_capabilities (ctx : kernel_context) : string list = 
    ctx.capabilities
  
  let execute (ctx : kernel_context) (kernel_name : string) (args : expr list) : expr =
    match kernel_name with
    | "apply_reverb" -> 
        (* TODO: Implement reverb effect *)
        ExprLit (LitUnit None)
    | "apply_compressor" -> 
        (* TODO: Implement compressor effect *)
        ExprLit (LitUnit None)
    | "mix_stereo" -> 
        (* TODO: Implement stereo mixing *)
        ExprLit (LitUnit None)
    | _ -> 
        ExprLit (LitUnit None)
  
  let compile_kernel (ctx : kernel_context) (name : string) (fn_decl : fn_decl) : unit =
    ()  (* TODO: Compile audio kernel *)
  
  let load_precompiled (ctx : kernel_context) (name : string) : unit =
    ()  (* TODO: Load precompiled audio kernel *)
  
  let allocate_device_memory (ctx : kernel_context) (size : int) : int =
    0  (* TODO: Allocate audio buffer *)
  
  let free_device_memory (ctx : kernel_context) (ptr : int) : unit =
    ()  (* TODO: Free audio buffer *)
  
  let copy_to_device (ctx : kernel_context) (ptr : int) (data : bytes) (offset : int) : unit =
    ()  (* TODO: Copy to audio buffer *)
  
  let copy_from_device (ctx : kernel_context) (ptr : int) (data : bytes) (offset : int) : unit =
    ()  (* TODO: Copy from audio buffer *)
end