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 DesignResolution = 'open' | 'proposed' | 'resolved' | 'delegated' | 'not_applicable';
export type DesignProvenance =
  | 'user'
  | 'extracted_user'
  | 'agent_proposal'
  | 'delegated_agent'
  | 'deterministic'
  | 'inherited'
  | 'reference_observation'
  | 'restored'
  | 'legacy_import';

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

export type DesignFieldDecision = {
  resolution: DesignResolution;
  provenance: DesignProvenance;
  locked: boolean;
  changed_by: string;
  origin_turn_id: string | null;
};

export type DesignSpecificationValues = {
  intent: {
    media: DesignMedium | null;
    creation_intent: 'create' | 'edit' | 'vary' | 'composite' | 'animate' | 'extend' | null;
    purpose: string | null;
    channel: string | null;
    audience: string | null;
    intended_response: string | null;
    communication_goal: string | null;
    success_definition: string | null;
    related_direction_id: string | null;
    related_asset_id: string | null;
  };
  content: {
    concept: string | null;
    narrative: string | null;
    subjects: Array<{
      id: string;
      description: string;
      attributes: string[];
      action: string | null;
      spatial_relationship: string | null;
    }>;
    action: string | null;
    environment: string | null;
    emotional_tone: string | null;
    exact_content: Array<{
      id: string;
      text: string;
      role: string | null;
      language: string | null;
      hierarchy: string | null;
      exact: boolean;
    }>;
  };
  visual: {
    art_direction: string | null;
    cultural_cues: string | null;
    composition: string | null;
    viewpoint: string | null;
    lighting: string | null;
    palette: string | null;
    materials: string | null;
    finish: string | null;
  };
  layout: {
    regions: Array<{ id: string; role: string; placement: string; priority: number }>;
    subject_placement: string | null;
    text_placement: string | null;
    logo_placement: string | null;
    safe_areas: string | null;
    crop_behavior: string | null;
    typography: string | null;
    exact_rendering: string | null;
  };
  references: Array<{
    id: string;
    asset_id: string;
    asset_revision: number | null;
    role: string;
    preserve: string[];
    adapt: string[];
    do_not_copy: string[];
    reviewed_observations: string[];
  }>;
  image: {
    operation_intent: string | null;
    source_asset_id: string | null;
    mask_asset_id: string | null;
    preserve_instructions: string[];
    change_instructions: string[];
    background_behavior: string | null;
    transparency_required: boolean | null;
    edge_crop_behavior: string | null;
    variant_relationship: string | null;
  };
  video: {
    total_duration_seconds: number | null;
    pacing: string | null;
    first_frame_asset_id: string | null;
    last_frame_asset_id: string | null;
    shots: Array<{
      id: string;
      start_milliseconds: number | null;
      end_milliseconds: number | null;
      story_beat: string;
      framing: string | null;
      camera: string | null;
      subject_motion: string | null;
      environment_motion: string | null;
      focus_behavior: string | null;
      transition: string | null;
    }>;
    rhythm: string | null;
    speed_behavior: string | null;
    stillness: string | null;
    loop_behavior: string | null;
    end_state: string | null;
    continuity: string | null;
    audio_intent: string | null;
  };
  output: {
    aspect_ratio: string | null;
    orientation: string | null;
    quality_intent: string | null;
    delivery_format: string | null;
    variant_count: number | null;
    variant_purposes: string[];
    crop_requirements: string | null;
    export_requirements: string | null;
    safe_areas: string | null;
  };
  constraints: {
    must_include: string[];
    must_preserve: string[];
    must_avoid: string[];
    brand_constraints: string[];
    flexible_preferences: string[];
    acceptance_criteria: Array<{ id: string; description: string; required: boolean }>;
  };
};

export type DesignSpecification = {
  schema_version: 1;
  values: DesignSpecificationValues;
  field_decisions: Record<string, DesignFieldDecision>;
};

export type DesignFieldChange = {
  path: string;
  kind: 'set' | 'update' | 'clear' | 'decision' | 'lock' | 'unlock';
  before_value?: unknown;
  after_value?: unknown;
  before_decision?: DesignFieldDecision | null;
  after_decision?: DesignFieldDecision | null;
};

export type DesignChangeSet = {
  interaction_id: string;
  changes: DesignFieldChange[];
};

export type DesignDecisionOption = {
  id: string;
  label: string;
  description: string | null;
};

export type DesignDecisionPrompt = {
  id: string;
  kind: 'suggestion' | 'question';
  basedOnSpecificationRevisionId: string;
  targetPaths: string[];
  title: string;
  body: string;
  options: DesignDecisionOption[];
};

export type DesignQuoteOutputSummary = {
  medium: DesignMedium;
  strategy: 'direct' | 'multi_step';
  aspectRatio: string;
  outputCount: number;
  deliveryFormat: string | null;
  durationSeconds: number | null;
  requiredOutputRoles: string[];
};

export type DesignGenerationQuote = {
  quoteId: string;
  status: 'offered' | 'consumed' | 'expired' | 'superseded';
  specificationRevision: number;
  specificationRevisionId: string;
  specificationDigest: string;
  medium: DesignMedium;
  compilerVersion: string;
  outputSummary: DesignQuoteOutputSummary;
  warnings: DesignCompilationIssue[];
  quotedDesignPoints: number;
  maximumCustomerChargeAtoms: number;
  expiresAt: string;
};

export type DesignForm = {
  schemaVersion: 1;
  workspaceId: string;
  directionId: string;
  directionRevision: number;
  rawTurnSequence: number;
  specificationRevision: number;
  workspaceViewRevision: number;
  specificationRevisionId: string;
  specificationDigest: string;
  specification: DesignSpecification;
  decisionPrompts: DesignDecisionPrompt[];
  activeQuotes: DesignGenerationQuote[];
  recentChangeSet: DesignChangeSet;
};

export type DesignTurn = {
  turnId: string;
  rawTurnSequence: number;
  userMessage: string;
  assistantMessage: string;
};

export type DesignWorkspaceSummary = {
  workspaceId: string;
  clientWorkspaceId: string;
  title: string;
  directionId: string;
  sessionId: string;
  directionRevision: number;
  specificationRevision: number;
  workspaceViewRevision: number;
  updatedAt: string;
};

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

export type DesignTaskProgress = {
  stage:
    | 'queued'
    | 'preparing'
    | 'submitting'
    | 'generating'
    | 'composing'
    | 'validating'
    | 'finalizing'
    | 'completed'
    | 'failed'
    | 'cancelled';
  completedRequiredSteps: number;
  totalRequiredSteps: number;
};

export type DesignGenerationTask = {
  taskId: string;
  quoteId: string;
  status: 'queued' | 'running' | 'succeeded' | 'failed' | 'cancelled';
  taskRevision: number;
  specificationRevision: number;
  specificationRevisionId: string;
  specificationDigest: string;
  medium: DesignMedium;
  compilerVersion: string;
  outputSummary: DesignQuoteOutputSummary;
  maximumCustomerChargeAtoms: number;
  customerBilling: {
    quotedAtoms: number;
    heldAtoms: number;
    chargedAtoms: number;
    refundedAtoms: number;
    pendingResolutionAtoms: number;
  };
  customerHoldExpiresAt: string;
  resolutionDeadlineAt: string | null;
  progress: DesignTaskProgress;
  executionHealth: 'normal' | 'recovering' | 'operator_required';
  cancellation: {
    state: 'available' | 'requested' | 'resolved' | 'unavailable';
    outcome: 'stopped_before_submit' | null;
  };
  issues: Array<{
    code: string;
    message: string;
    recoveryOwner: 'platform' | 'operator';
  }>;
  resultAssetIds: string[];
  nextActions: Array<
    'cancel' | 'view_result' | 'revise_design' | 'generate_again' | 'wait_for_resolution'
  >;
  createdAt: string;
};

export type DesignWorkspace = {
  workspace: DesignWorkspaceSummary;
  form: DesignForm;
  turns: DesignTurn[];
  tasks: DesignGenerationTask[];
  assets: DesignAsset[];
};

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

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

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

export type DesignDeleteWorkspaceResult = {
  workspaceId: string;
  deleted: true;
};

export type DesignUserFieldOperation =
  | { kind: 'set'; path: string; value: unknown }
  | { kind: 'clear'; path: string; resolution?: 'open' | 'not_applicable' }
  | { kind: 'set_lock'; path: string; locked: boolean };

export type DesignUserInput =
  | { kind: 'direct_edit'; operations: DesignUserFieldOperation[] }
  | { kind: 'chat'; message: string }
  | {
    kind: 'prompt_resolution';
    promptId: string;
    action: 'select' | 'reject';
    optionId?: string;
  }
  | { kind: 'restore'; specificationRevisionId: string };

export type DesignCommandInput =
  | {
    kind: 'apply_input';
    workspaceId: string;
    sessionId: string;
    expectedDirectionRevision: number;
    clientOperationId: string;
    input: DesignUserInput;
  }
  | {
    kind: 'request_quote';
    workspaceId: string;
    sessionId: string;
    expectedDirectionRevision: number;
    specificationRevision: number;
    clientOperationId: string;
  }
  | {
    kind: 'confirm_generation';
    workspaceId: string;
    sessionId: string;
    quoteId: string;
    expectedDirectionRevision: number;
    clientOperationId: string;
  };

export type DesignCommandResult = {
  clientOperationId: string;
  runId: string;
  workspace: DesignWorkspace;
};

export type DesignCompilationIssue = {
  code: string;
  message: string;
  severity: 'blocker' | 'warning';
  path?: string | null;
};

export type DesignInteractionOutcome = {
  operationKind:
    | 'bootstrap'
    | 'legacy_import'
    | 'direct_edit'
    | 'chat'
    | 'prompt_resolution'
    | 'restore'
    | 'quote_request'
    | 'generation_confirmation';
  interactionId: string;
  baseDirectionRevision: number;
  newDirectionRevision: number;
  rawTurnSequence: number;
  specificationRevision: number;
  specificationRevisionId: string;
  workspaceViewRevision: number;
  specificationRevisionCreated: boolean;
  meaningChanged: boolean;
  changeSet: DesignChangeSet;
  turnId: string | null;
  assistantMessage: string | null;
  createdDecisionPromptIds: string[];
  resolvedDecisionPromptId: string | null;
  supersededDecisionPromptIds: string[];
  supersededQuoteCount: number;
  quoteId: string | null;
  generationTaskId: string | null;
};

export type DesignSessionSnapshotEvent = {
  id: string;
  type: 'design.session.snapshot';
  form: DesignForm;
};

export type DesignAssistantDeltaEvent = {
  id: string;
  type: 'design.assistant.delta';
  workspaceId: string;
  directionId: string;
  clientOperationId: string;
  directionRevision: number;
  chunkIndex: number;
  delta: string;
};

export type DesignDirectionUpdatedEvent = {
  id: string;
  type: 'design.direction.updated';
  replayed: boolean;
  operation: DesignInteractionOutcome;
  form: DesignForm;
};

export type DesignQuoteBlockedEvent = {
  id: string;
  type: 'design.quote.blocked';
  clientOperationId: string;
  blockers: DesignCompilationIssue[];
  warnings: DesignCompilationIssue[];
  form: DesignForm;
};

export type DesignWorkspaceUpdatedEvent = {
  id: string;
  type: 'design.workspace.updated';
  workspaceId: string;
  workspaceViewRevision: number;
  changedDirection: {
    directionId: string;
    directionRevision: number;
    specificationRevision: number;
  } | null;
  changedTask: DesignGenerationTask | null;
};

export type DesignWorkspaceEvent =
  | DesignSessionSnapshotEvent
  | DesignAssistantDeltaEvent
  | DesignDirectionUpdatedEvent
  | DesignQuoteBlockedEvent
  | DesignWorkspaceUpdatedEvent;

export type DesignWorkspaceEventSubscription = {
  events: AsyncIterable<DesignWorkspaceEvent>;
  close(): void;
};

export type DesignWorkspaceEventSubscriptionInput = {
  workspaceId: string;
  sessionId: string;
  afterEventId?: string;
};

export type DesignAssetSaveResult = { status: 'saved' | 'cancelled' };
export type DesignImageUploadMimeType = 'image/jpeg' | 'image/png' | 'image/webp';
export type DesignAssetUploadInput = {
  workspaceId: string;
  fileName: string;
  mimeType: DesignImageUploadMimeType;
  bytes: Uint8Array;
};

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

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