analyse-image

import fs from "fs";
import path from "path";

export type AttachmentRecord = {
  a: number;
  preview?: string;
  createdAt: string;
  [key: string]: unknown;
};

export type VariantRecord = {
  v: number;
  preview: string;
  createdAt: string;
  [key: string]: unknown;
};

export type PictureRecord = {
  p: number;
  preview: string;
  sourceUrl: string;
  createdAt: string;
  [key: string]: unknown;
};

export type ImageRecord = {
  i: number;
  preview: string;
  createdAt: string;
  [key: string]: unknown;
};

export type ChatMediaState = {
  attachments: AttachmentRecord[];
  variants: VariantRecord[];
  pictures: PictureRecord[];
  images: ImageRecord[];
  counters: {
    nextAttachmentA?: number;
    nextVariantV?: number;
    nextPictureP?: number;
    nextImageI?: number;
  };
};

export async function readState(chatWd: string): Promise<ChatMediaState> {
  const p = path.join(chatWd, "chat_media_state.json");
  try {
    const raw = await fs.promises.readFile(p, "utf-8");
    const json = JSON.parse(raw);
    return {
      attachments: Array.isArray(json?.attachments) ? json.attachments : [],
      variants: Array.isArray(json?.variants) ? json.variants : [],
      pictures: Array.isArray(json?.pictures) ? json.pictures : [],
      images: Array.isArray(json?.images) ? json.images : [],
      counters: json?.counters || {},
    };
  } catch {
    return {
      attachments: [],
      variants: [],
      pictures: [],
      images: [],
      counters: {},
    };
  }
}