/**
 * 跨模块共享枚举。
 * 与 contracts/data-models.md 中的枚举**逐字对应**，改动必须同步契约版本。
 */

export enum SourceType {
  /** 原创 */
  Original = 'original',
  /** 已获授权 */
  Licensed = 'licensed',
  /** Creative Commons */
  Cc = 'cc',
  /** 公共领域 */
  PublicDomain = 'public_domain',
  /** 用户上传（需审核） */
  UserUpload = 'user_upload',
  /** 其他（须在 sourceName 说明） */
  Other = 'other',
}

export enum PublishStatus {
  Draft = 'draft',
  Pending = 'pending',
  Published = 'published',
  Rejected = 'rejected',
}

export enum MotionFormat {
  Bvh = 'bvh',
  Fbx = 'fbx',
  Gltf = 'gltf',
  Glb = 'glb',
  KeypointsJson = 'keypoints-json',
}

export enum ModelFormat {
  Vrm = 'vrm',
  Glb = 'glb',
  Gltf = 'gltf',
  Fbx = 'fbx',
}

export enum PreprocessState {
  None = 'none',
  Running = 'running',
  Done = 'done',
  Failed = 'failed',
}

export enum ReviewAction {
  Submit = 'submit',
  Approve = 'approve',
  Reject = 'reject',
  Withdraw = 'withdraw',
}

export enum TargetType {
  Song = 'song',
  Motion = 'motion',
  Model = 'model',
}

export enum AssetKind {
  SongAudio = 'song-audio',
  SongCover = 'song-cover',
  Motion = 'motion',
  Model = 'model',
  Thumbnail = 'thumbnail',
  Keypoints = 'keypoints',
}

export const SOURCE_TYPE_VALUES = Object.values(SourceType) as string[];
export const PUBLISH_STATUS_VALUES = Object.values(PublishStatus) as string[];
export const MOTION_FORMAT_VALUES = Object.values(MotionFormat) as string[];
export const MODEL_FORMAT_VALUES = Object.values(ModelFormat) as string[];
export const TARGET_TYPE_VALUES = Object.values(TargetType) as string[];

/** 允许上传的扩展名 → 动作格式 */
export const MOTION_EXTENSION_MAP: Record<string, MotionFormat> = {
  '.bvh': MotionFormat.Bvh,
  '.fbx': MotionFormat.Fbx,
  '.gltf': MotionFormat.Gltf,
  '.glb': MotionFormat.Glb,
  '.json': MotionFormat.KeypointsJson,
};

/** 允许上传的扩展名 → 模型格式 */
export const MODEL_EXTENSION_MAP: Record<string, ModelFormat> = {
  '.vrm': ModelFormat.Vrm,
  '.glb': ModelFormat.Glb,
  '.gltf': ModelFormat.Gltf,
  '.fbx': ModelFormat.Fbx,
};

export const AUDIO_EXTENSIONS = ['.mp3', '.wav', '.ogg', '.m4a', '.aac', '.flac'];
export const IMAGE_EXTENSIONS = ['.png', '.jpg', '.jpeg', '.webp'];

/**
 * 状态机：契约 database.md §状态机。
 * key = 当前状态，value = 允许流转到的状态集合。
 */
export const STATUS_TRANSITIONS: Record<PublishStatus, PublishStatus[]> = {
  [PublishStatus.Draft]: [PublishStatus.Pending, PublishStatus.Published],
  [PublishStatus.Pending]: [PublishStatus.Published, PublishStatus.Rejected, PublishStatus.Draft],
  [PublishStatus.Published]: [PublishStatus.Draft, PublishStatus.Rejected],
  [PublishStatus.Rejected]: [PublishStatus.Pending, PublishStatus.Draft],
};

export function canTransition(from: PublishStatus, to: PublishStatus): boolean {
  return (STATUS_TRANSITIONS[from] ?? []).includes(to);
}

/** 审核动作 → 目标状态 */
export const ACTION_TARGET_STATUS: Record<ReviewAction, PublishStatus> = {
  [ReviewAction.Submit]: PublishStatus.Pending,
  [ReviewAction.Approve]: PublishStatus.Published,
  [ReviewAction.Reject]: PublishStatus.Rejected,
  [ReviewAction.Withdraw]: PublishStatus.Draft,
};