"use client";

type DocumentCommandMeta = {
  requestId?: string;
  traceId?: string;
  commandId?: string;
  commandName?: string;
};

type DocumentCommandErrorPayload = {
  error?: string;
};

export type DocumentCreateCommandResult = {
  id: string;
  title?: string | null;
  parent_id?: string | null;
  sort_order?: number | null;
  workspace_id?: string;
  access_scope?: "private" | "shared" | "public";
  is_template?: boolean;
  created_at?: string | null;
  updated_at?: string | null;
  meta?: DocumentCommandMeta;
};

export type DocumentCreateChildCommandResult = {
  pageId: string;
  title?: string | null;
  meta?: DocumentCommandMeta;
};

type RenameDocumentInput = {
  documentId: string;
  workspaceId?: string | null;
  title: string;
};

type MoveDocumentInput = {
  documentId: string;
  parentId?: string | null;
  position: number;
  workspaceId?: string | null;
};

type CreateChildDocumentInput = {
  parentId: string | null;
  title: string;
  blocks: unknown[];
};

async function postDocumentCommand<TResult>(path: string, payload: unknown, fallbackMessage: string): Promise<TResult> {
  const response = await fetch(path, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify(payload),
  });

  const body = (await response.json().catch(() => null)) as TResult | DocumentCommandErrorPayload | null;
  if (!response.ok) {
    const message =
      body && typeof body === "object" && "error" in body && typeof body.error === "string"
        ? body.error
        : fallbackMessage;
    throw new Error(message);
  }

  return body as TResult;
}

export async function createDocumentCommand(parentId: string | null): Promise<DocumentCreateCommandResult> {
  return postDocumentCommand<DocumentCreateCommandResult>("/api/documents/create", { parentId }, "新建页面失败，请稍后再试");
}

export async function createChildDocumentCommand(
  input: CreateChildDocumentInput,
): Promise<DocumentCreateChildCommandResult> {
  return postDocumentCommand<DocumentCreateChildCommandResult>(
    "/api/documents/create-child",
    input,
    "创建子页面失败，请稍后再试",
  );
}

export async function renameDocumentCommand(input: RenameDocumentInput): Promise<{ ok: true; meta?: DocumentCommandMeta }> {
  return postDocumentCommand<{ ok: true; meta?: DocumentCommandMeta }>(
    "/api/documents/title",
    {
      documentId: input.documentId,
      workspaceId: input.workspaceId ?? null,
      title: input.title,
    },
    "重命名失败，请稍后再试",
  );
}

export async function moveDocumentCommand(input: MoveDocumentInput): Promise<{ ok: true; meta?: DocumentCommandMeta }> {
  return postDocumentCommand<{ ok: true; meta?: DocumentCommandMeta }>(
    "/api/documents/move",
    {
      documentId: input.documentId,
      parentId: input.parentId ?? null,
      position: input.position,
      workspaceId: input.workspaceId ?? null,
    },
    "移动失败，请稍后再试",
  );
}