// Internal IR (Intermediate Representation) for any model graph.
// We deliberately decouple from ONNX so we can later add other backends
// (TensorFlow SavedModel, GGUF metadata, raw config.json heuristics, etc.)
// without touching the rendering layer.

export type TensorShape = (number | string)[];

export interface IRTensorInfo {
  name: string;
  shape: TensorShape;
  dtype: string;
}

export interface IRWeight {
  name: string;
  shape: number[];
  dtype: string;
  numParams: number;
}

export interface IRNode {
  id: string;
  opType: string;
  name: string;
  inputs: string[];
  outputs: string[];
  attrs: Record<string, unknown>;
  weights: IRWeight[];
}

export type IREdgeKind = "tree" | "forward" | "residual";

export interface IREdge {
  id: string;
  source: string;
  target: string;
  tensor: string;
  shape?: TensorShape;
  dtype?: string;
  /**
   * Visual classification, used by the renderer to pick a style:
   *   - `tree`     parent→child structural edge (default for legacy paths)
   *   - `forward`  real forward()-pass edge synthesised from a template
   *   - `residual` residual / skip connection
   */
  kind?: IREdgeKind;
}

export interface IRGraphMeta {
  modelName: string;
  producer: string;
  irVersion: number;
  opsetVersion: number;
  totalParams: number;
  nodeCount: number;
  inputs: IRTensorInfo[];
  outputs: IRTensorInfo[];
  /** HF `model_type` from config.json (e.g. "llama", "gpt2", "bert"). Used to
   *  generate human-friendly Python class names like LlamaDecoderLayer. */
  modelType?: string;
  /** First entry of `architectures` from config.json (e.g. "LlamaForCausalLM"). */
  architecture?: string;
}

export interface IRGraph {
  nodes: IRNode[];
  edges: IREdge[];
  meta: IRGraphMeta;
}

export interface ResolvedModel {
  repoId: string;
  filePath: string;
  url: string;
  sizeBytes: number;
  hasExternalData: boolean;
}

export interface LoadProgress {
  phase: "resolving" | "streaming" | "building" | "laying-out" | "done";
  message: string;
  /** Bytes received from the network so far. */
  loaded?: number;
  /** Total file size (for context) — note streaming may finish earlier. */
  total?: number;
}