/** A byte (0..255). This is not enforced by the compiler. */
export type byte = number;

/** A word (0..65535). This is not enforced by the compiler. */
export type word = number;

/** A raw region of memory. */
export type memory = number[] | Uint8Array;

/** A mapped region of memory. */
export interface Memory {
  /** Start page. */
  start(): byte;
  /** End page, inclusive. */
  end(): byte;
  /** Read a byte. */
  read(page: byte, offset: byte): byte;
  /** Write a byte. */
  write(page: byte, offset: byte, value: byte): void;
}

export type DiskFormat = '2mg' | 'd13' | 'do' | 'dsk' | 'hdv' | 'po' | 'nib' | 'woz';

export interface Drive {
  format: DiskFormat,
  volume: number,
  tracks: Array<byte[] | Uint8Array>,
  trackMap: unknown,
}

export interface DiskIIDrive extends Drive {
  rawTracks: unknown,
  track: number,
  head: number,
  phase: number,
  readOnly: boolean,
  dirty: boolean,
}

export interface Restorable<T> {
  getState(): T;
  setState(state: T): void;
}