declare module 'free-tex-packer-core' {
  export default function pack(
    files: Array<{ path: string; contents: Buffer }>,
    config?: TexturePackerOptions,
    callback?: (files: Array<{ name: string, buffer: Buffer }>, error?: Error) => void,
  ): void;

  export function packAsync(
    files: Array<{ path: string; contents: Buffer }>,
    config?: TexturePackerOptions,
  ): Promise<Array<{ name: string, buffer: Buffer }>>;
}

/**
 * Trim mode for sprites
 *
 * @see TexturePackerOptions.trimMode
 * @see TexturePackerOptions.allowTrim
 */
export enum TrimMode {
  /**
   * Remove transparent pixels from sides, but left original frame size
   *
   * For example:
   *  Original sprite has size 64x64, after removing transparent pixels its real size will be reduced to 32x28,
   *  which will be written as frame size, but original frame size will stay the same: 64x64
   */
  TRIM = 'trim',
  /**
   * Remove transparent pixels from sides, and update frame size
   *
   * For example:
   *  Original sprite has size 64x64, after removing transparent pixels its real size will be reduced to 32x28,
   *  which will be written as frame size, and original frame size will be reduced to the same dimensions
   */
  CROP = 'crop',
}

/**
 * Output atlas texture format
 *
 * @see TexturePackerOptions.textureFormat
 */
export enum TextureFormat {
  PNG = 'png',
  JPG = 'jpg',
}

/**
 * Atlas packer type.
 * There are two implementations which could be used
 *
 * @see TexturePackerOptions.packer
 * @see TexturePackerOptions.packerMethod
 * @see MaxRectsBinMethod
 * @see MaxRectsPackerMethod
 */
export enum PackerType {
  MAX_RECTS_BIN = 'MaxRectsBin',
  MAX_RECTS_PACKER = 'MaxRectsPacker',
  OPTIMAL_PACKER = 'OptimalPacker'
}

/**
 * MaxRectsBin packer method
 *
 * @see TexturePackerOptions.packerMethod
 */
export enum MaxRectsBinMethod {
  BEST_SHORT_SIDE_FIT = 'BestShortSideFit',
  BEST_LONG_SIDE_FIT = 'BestLongSideFit',
  BEST_AREA_FIT = 'BestAreaFit',
  BOTTOM_LEFT_RULE = 'BottomLeftRule',
  CONTACT_POINT_RULE = 'ContactPointRule',
}

/**
 * MaxRectsPacker packer method
 *
 * @see TexturePackerOptions.packerMethod
 */
export enum MaxRectsPackerMethod {
  SMART = 'Smart',
  SQUARE = 'Square',
  SMART_SQUARE = 'SmartSquare',
  SMART_AREA = 'SmartArea',
  SQUARE_AREA = 'SquareArea',
  SMART_SQUARE_AREA = 'SmartSquareArea'
}

/**
 * Packer exporter type
 * Predefined exporter types (supported popular formats)
 * Instead of predefined type you could use custom exporter
 *
 * @see TexturePackerOptions.exporter
 * @see PackerExporter
 */
export enum PackerExporterType {
  JSON_HASH = 'JsonHash',
  JSON_ARRAY = 'JsonArray',
  CSS = 'Css',
  OLD_CSS = 'OldCss',
  PIXI = 'Pixi',
  PHASER_HASH = 'PhaserHash',
  PHASER_ARRAY = 'PhaserArray',
  PHASER3 = 'Phaser3',
  XML = 'XML',
  STARLING = 'Starling',
  COCOS2D = 'Cocos2d',
  SPINE = 'Spine',
  UNREAL = 'Unreal',
  UIKIT = 'UIKit',
  UNITY3D = 'Unity3D',
}

/**
 * Bitmap filter, applicable to output atlas texture
 *
 * @see TexturePackerOptions.filter
 */
export enum BitmapFilterType {
  GRAYSCALE = 'grayscale',
  MASK = 'mask',
  NONE = 'none',
}

/**
 * Texture packer options
 */
export interface TexturePackerOptions {
  /**
   * Name of output files.
   *
   * @default pack-result
   */
  textureName?: string;

  /**
   * Max single texture width in pixels
   *
   * @default 2048
   */
  width?: number;
  /**
   * Max single texture height in pixels
   *
   * @default 2048
   */
  height?: number;
  /**
   * Fixed texture size
   *
   * @default false
   */
  fixedSize?: boolean;
  /**
   * Force power of two textures sizes
   *
   * @default false
   */
  powerOfTwo?: boolean;
  /**
   * Spaces in pixels around images
   *
   * @default 0
   */
  padding?: number;
  /**
   * Extrude border pixels size around images
   *
   * @default 0
   */
  extrude?: number;
  /**
   * Allow image rotation
   * @default true
   */
  allowRotation?: boolean;
  /**
   * Allow detect identical images
   *
   * @default true
   */
  detectIdentical?: boolean;
  /**
   * Allow trim images
   *
   * @default true
   */
  allowTrim?: boolean;
  /**
   * Trim mode
   *
   * @default {@link TrimMode.TRIM}
   * @see {@link TrimMode}
   * @see {@link allowTrim}
   */
  trimMode?: TrimMode;
  /**
   * Threshold alpha value
   *
   * @default 0
   */
  alphaThreshold?: number;
  /**
   * Remove file extensions from frame names
   *
   * @default false
   */
  removeFileExtension?: boolean;
  /**
   * Prepend folder name to frame names
   *
   * @default true
   */
  prependFolderName?: boolean;
  /**
   * Output file format
   *
   * @default {@link TextureFormat.PNG}
   * @see {@link TextureFormat}
   */
  textureFormat?: TextureFormat;
  /**
   * Export texture as base64 string to atlas meta tag
   *
   * @default false
   */
  base64Export?: boolean;
  /**
   * Scale size and positions in atlas
   *
   * @default 1
   */
  scale?: number;
  /**
   * Texture scaling method
   *
   * @default ScaleMethod.BILINEAR
   */
  scaleMethod?: ScaleMethod;
  /**
   * "Tinify" texture using TinyPNG
   *
   * @default false
   */
  tinify?: boolean;
  /**
   * TinyPNG key
   *
   * @default empty string
   */
  tinifyKey?: string;
  /**
   * Type of packer
   * @see PackerType
   * @default {@link PackerType.MAX_RECTS_BIN}
   */
  packer?: PackerType;
  /**
   * Pack method
   *
   * @default {@link MaxRectsBinMethod.BEST_SHORT_SIDE_FIT}
   * @see MaxRectsBinMethod
   * @see MaxRectsPackerMethod
   */
  packerMethod?: MaxRectsBinMethod | MaxRectsPackerMethod;
  /**
   * Name of predefined exporter (), or custom exporter (see below)
   *
   * @default JsonHash
   */
  exporter?: PackerExporterType | PackerExporter;
  /**
   * Bitmap filter type
   *
   * @see BitmapFilterType
   * @default {@link BitmapFilterType.NONE}
   */
  filter?: BitmapFilterType;
  /**
   * External application info.
   * Required fields: url and version
   *
   * @default null
   */
  appInfo?: any;
}

export enum ScaleMethod {
  BILINEAR = 'BILINEAR',
  NEAREST_NEIGHBOR = 'NEAREST_NEIGHBOR',
  HERMITE = 'HERMITE',
  BEZIER = 'BEZIER',
}

/**
 * Texture packer uses {@link http://mustache.github.io/ | mustache} template engine.
 * Look at documentation how to create custom exporter:
 * {@link https://www.npmjs.com/package/free-tex-packer-core#custom-exporter}
 */
export interface PackerExporter {
  /**
   * File extension
   */
  fileExt: string;
  /**
   * Path to template file (content could be used instead)
   * @see {@link content}
   */
  template?: string;
  /**
   * Template content (template path could be used instead)
   * @see {@link template}
   */
  content?: string;
}