export const IMAGE_WORKSPACE_UNAVAILABLE_CODE = 'IMAGE_WORKSPACE_UNAVAILABLE';
export const IMAGE_WORKSPACE_UNAVAILABLE_MESSAGE = 'AI 设计暂不可用';
export const IMAGE_WORKSPACE_API_PATH = '/api/works/image-workspace';

export type DesignMedium = 'image' | 'video';
export type DesignWorkspacePhase = 'shaping' | 'awaiting_confirmation' | 'blocked';
export type DesignTaskStatus = 'queued' | 'running' | 'succeeded' | 'failed' | 'cancelled';
export type DesignQuoteStatus = 'active' | 'consumed' | 'expired' | 'superseded';

export type DesignCapabilities = {
  conversation: boolean;
  generation: boolean;
  image: boolean;
  video: boolean;
};

export type DesignBrief = {
  version: number;
  status: 'draft' | 'ready' | 'confirmed';
  medium: DesignMedium | null;
  summary: string;
  ready: boolean;
  missingDecision: string | null;
};

export type DesignGenerationQuote = {
  quoteId: string;
  status: DesignQuoteStatus;
  medium: DesignMedium;
  briefVersion: number;
  briefSummary: string;
  quotedDesignPoints: number;
  expiresAt: string;
};

export type DesignMessage = {
  id: string;
  role: 'user' | 'assistant';
  kind: 'user' | 'reply' | 'choice' | 'confirmation' | 'safety_redirect' | 'failure';
  text: string;
  quickReplies: string[];
  generationQuote: DesignGenerationQuote | null;
  turnRevision: number;
  createdAt: string;
};

export type DesignWorkspaceSummary = {
  workspaceId: string;
  title: string;
  turnRevision: number;
  viewRevision: number;
  phase: DesignWorkspacePhase;
  brief: DesignBrief;
  updatedAt: string;
};

export type DesignWorkspace = DesignWorkspaceSummary & {
  messages: DesignMessage[];
};

export type DesignAsset = {
  assetId: string;
  workspaceId: string;
  mediaType: DesignMedium;
  mimeType: string;
  width: number;
  height: number;
  durationMilliseconds: number | null;
  createdAt: string;
  contentPath: string;
};

export type DesignGenerationTask = {
  taskId: string;
  workspaceId: string;
  medium: DesignMedium;
  status: DesignTaskStatus;
  briefVersion: number;
  briefSummary: string;
  quoteId: string | null;
  quotedDesignPoints: number | null;
  failureCode: string | null;
  resultAssets: DesignAsset[];
  createdAt: string;
  updatedAt: string;
};

export type DesignGenerationTaskUpdatedEvent = {
  id: string;
  type: 'design.generation_task.updated';
  workspaceId: string;
  workspaceViewRevision: number;
  generationTask: DesignGenerationTask;
};

export type DesignGenerationTasksSnapshotEvent = {
  id: string;
  type: 'design.generation_tasks.snapshot';
  workspaceId: string;
  workspaceViewRevision: number;
  workspace: DesignWorkspace;
  generationTasks: DesignGenerationTask[];
};

export type DesignAssistantDeltaEvent = {
  id: string;
  type: 'design.assistant.delta';
  workspaceId: string;
  clientTurnId: string;
  turnRevision: number;
  chunkIndex: number;
  delta: string;
};

export type DesignWorkspaceEvent =
  | DesignGenerationTaskUpdatedEvent
  | DesignGenerationTasksSnapshotEvent
  | DesignAssistantDeltaEvent;

export type DesignWorkspaceBootstrap = {
  capabilities: DesignCapabilities;
  workspaces: DesignWorkspaceSummary[];
};

export type DesignCreateWorkspaceInput = {
  clientWorkspaceId: string;
  title: string;
};

export type DesignRenameWorkspaceInput = {
  workspaceId: string;
  title: string;
};

export type DesignSubmitMessageInput = {
  workspaceId: string;
  clientTurnId: string;
  expectedTurnRevision: number;
  message: string;
  attachmentAssetIds?: string[];
};

export type DesignConfirmGenerationInput = {
  workspaceId: string;
  clientTurnId: string;
  expectedTurnRevision: number;
  quoteId: string;
};

export function designAssetContentPath(workspaceId: string, assetId: string): string {
  return `${IMAGE_WORKSPACE_API_PATH}/workspaces/${encodeURIComponent(workspaceId)}/assets/${encodeURIComponent(assetId)}/content`;
}