// 画布Agent对话契约：会话元数据存 SpacetimeDB，消息正文整体存 OSS（editor-agent/{conversationId}.json）。

export const EDITOR_AGENT_MAX_ATTACHMENTS = 9;
export const EDITOR_AGENT_ATTACHMENT_LABEL_MAX_CODE_POINTS = 24;
export const EDITOR_AGENT_ERROR_MESSAGE_PREFIX = 'ERROR ';

export type EditorAgentMessageRole = 'user' | 'assistant' | 'system';

export type EditorAgentToolCallStatus =
  | 'not_completed'
  | 'completed'
  | 'failed'
  | 'cancelled';

export type EditorAgentAttachmentSource = 'canvas_resource' | 'library_asset';

function isUnsafeEditorAgentAttachmentLabelCharacter(character: string) {
  const codePoint = character.codePointAt(0) ?? 0;
  const isControlCharacter =
    codePoint <= 0x1f || (codePoint >= 0x7f && codePoint <= 0x9f);
  const isAsciiPunctuation =
    (codePoint >= 0x21 && codePoint <= 0x2f) ||
    (codePoint >= 0x3a && codePoint <= 0x40) ||
    (codePoint >= 0x5b && codePoint <= 0x60) ||
    (codePoint >= 0x7b && codePoint <= 0x7e);
  const isUnsafeAsciiPunctuation =
    isAsciiPunctuation &&
    character !== '-' &&
    character !== '_' &&
    character !== '.';
  return isControlCharacter || isUnsafeAsciiPunctuation;
}

function normalizeEditorAgentAttachmentLabel(
  label: string | null | undefined,
  fallback: string,
) {
  const normalizeCandidate = (candidate: string | null | undefined) => {
    const normalized: string[] = [];
    let codePoints = 0;
    let pendingSpace = false;
    for (const character of candidate?.trim() ?? '') {
      if (isUnsafeEditorAgentAttachmentLabelCharacter(character)) {
        continue;
      }
      if (/\s/u.test(character)) {
        pendingSpace = normalized.length > 0;
        continue;
      }
      if (
        pendingSpace &&
        codePoints + 1 < EDITOR_AGENT_ATTACHMENT_LABEL_MAX_CODE_POINTS
      ) {
        normalized.push(' ');
        codePoints += 1;
      }
      pendingSpace = false;
      if (codePoints >= EDITOR_AGENT_ATTACHMENT_LABEL_MAX_CODE_POINTS) {
        break;
      }
      normalized.push(character);
      codePoints += 1;
    }
    return normalized.join('').trim();
  };

  return normalizeCandidate(label) || normalizeCandidate(fallback) || '图片';
}

export interface EditorAgentAttachmentRef {
  source: EditorAgentAttachmentSource;
  referenceId: string;
  objectKey?: string | null;
  imageSrc: string;
  thumbnailSrc?: string | null;
  label?: string | null;
  width?: number | null;
  height?: number | null;
}

export function createEditorAgentAttachmentRef(
  input: EditorAgentAttachmentRef,
  fallbackLabel: string = input.referenceId,
) {
  return {
    ...input,
    label: normalizeEditorAgentAttachmentLabel(input.label, fallbackLabel),
  };
}

export interface EditorAgentGeneratedImage {
  resourceId?: string | null;
  objectKey?: string | null;
  assetObjectId?: string | null;
  imageSrc: string;
  thumbnailSrc?: string | null;
  width?: number | null;
  height?: number | null;
}

export interface EditorAgentGeneratedVideo {
  resourceId?: string | null;
  objectKey?: string | null;
  assetObjectId?: string | null;
  videoSrc: string;
  thumbnailSrc?: string | null;
  width?: number | null;
  height?: number | null;
}

export interface EditorAgentGeneratedAudio {
  resourceId?: string | null;
  objectKey?: string | null;
  assetObjectId?: string | null;
  audioSrc: string;
}

export interface EditorAgentToolCallStringArg {
  name: string;
  label: string;
  value: string;
}

export interface EditorAgentToolCallImageRef {
  imageId: string;
  imageSrc: string;
  objectKey?: string | null;
  thumbnailSrc?: string | null;
  label?: string | null;
  width?: number | null;
  height?: number | null;
}

export interface EditorAgentToolCallImageArg {
  name: string;
  label: string;
  refs: EditorAgentToolCallImageRef[];
}

export interface EditorAgentToolCallDisplayExtras {
  priceMudPoints: number;
}

export interface EditorAgentToolCallDisplayArgs {
  stringArgs: EditorAgentToolCallStringArg[];
  imageArgs: EditorAgentToolCallImageArg[];
  extras: EditorAgentToolCallDisplayExtras;
}

export interface EditorAgentToolCall {
  toolName: string;
  status: EditorAgentToolCallStatus;
  args: unknown;
  displayArgs: EditorAgentToolCallDisplayArgs;
  externalJobId?: string | null;
  images: EditorAgentGeneratedImage[];
  // Older persisted conversation documents do not contain these media fields.
  videos?: EditorAgentGeneratedVideo[];
  audios?: EditorAgentGeneratedAudio[];
  error?: string | null;
}

export interface EditorAgentMessage {
  // Frontend must not use this to organize messages.
  // It is an opaque backend locator for pending tool-call operations.
  id: number;
  // Present only on user messages created from a client send request.
  clientMessageId?: string | null;
  role: EditorAgentMessageRole;
  text: string;
  attachments: EditorAgentAttachmentRef[];
  toolCall: EditorAgentToolCall | null;
  createdAt: string;
}

export interface EditorAgentConversationSummary {
  conversationId: string;
  projectId: string;
  title: string;
  updatedAt: string;
}

export interface EditorAgentConversationDetail {
  conversationId: string;
  projectId: string;
  title: string;
  createdAt: string;
  updatedAt: string;
  messages: EditorAgentMessage[];
}

export interface EditorAgentConversationMessagesDocument {
  version: number;
  conversationId: string;
  messages: EditorAgentMessage[];
}

export interface CreateEditorAgentConversationRequest {
  title?: string | null;
}

export interface EditorAgentConversationListResponse {
  conversations: EditorAgentConversationSummary[];
}

export interface EditorAgentConversationResponse {
  conversation: EditorAgentConversationDetail;
}

export interface EditorAgentMessageRequest {
  clientMessageId: string;
  text: string;
  attachments?: EditorAgentAttachmentRef[];
}

export interface EditorAgentMessageResponse {
  conversation: EditorAgentConversationSummary;
  deltaMessages: EditorAgentMessage[];
  errorMessage: string | null;
}