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// https://www.jspacker.org/

var _contacts = [];
class ContactFinder {
  #db;
  #chatToFind;
  #dbName = "model-storage";
  #chatsCol = "chat";
  #contactCol = "contact";
  #groupCol = "participant";

  constructor(chatGroupName) {
    this.#chatToFind = chatGroupName;
  }

  async openConnection() {
    if (!this.#db) {
      const dbName = this.#dbName;
      this.#db = await new Promise((resolve, reject) => {
        let request = indexedDB.open(dbName);
        request.onerror = (event) => {
          reject(event);
        };
        request.onsuccess = (event) => {
          resolve(event.target.result);
        };
      });
    }
    return this.#db;
  }

  async #promisifyCol(collection, query, count) {
    const db = await this.openConnection();
    return new Promise((resolve, reject) => {
      const request = db.transaction(collection).objectStore(collection).getAll(query, count);

      request.onerror = (event) => {
        reject(event);
      };
      request.onsuccess = (event) => {
        resolve(event.target.result);
      };
    });
  }

  async #getChats() {
    const allChats = await this.#promisifyCol(this.#chatsCol);
    const chatToFind = this.#chatToFind;
    return allChats.filter((chat) => {
      return chat.name && chat.name.includes(chatToFind);
    });
  }

  async #getGroups() {
    const chats = (await this.#getChats()).map((chat) => chat.id);
    const allGroups = await this.#promisifyCol(this.#groupCol);

    return allGroups.filter((group) => {
      return group.groupId && chats.includes(group.groupId);
    });
  }

  async #getGroupParticipants() {
    const groups = await this.#getGroups();
    const map = new Map();

    groups.forEach((group) => {
      group.participants.forEach((par) => {
        const num = par.replace("@c.us", "");
        map.set(num, num);
      });
    });

    return map;
  }

  async #getContacts() {
    return this.#promisifyCol(this.#contactCol);
  }

  async getGroupMembers() {
    const members = await this.#getGroupParticipants();
    const contacts = await this.#getContacts();

    contacts.forEach((contact) => {
      var num;
      if (contact.phoneNumber) {
        num = contact.phoneNumber.split("@")[0];
      } else if (contact.id) {
        num = contact.id.split("@")[0];
      }
      if (num && members.get(num)) {
        var m = {
          phoneNum: num,
          name: contact.name,
          pushname: contact.pushname,
        };
        members.set(num, m);
        _contacts.push(m);
      }
    });
    return members;
  }


  async downloadMembersAsCSV() {
    const members = await this.getGroupMembers();
    let csvContent = "data:text/csv;charset=utf-8,";
        csvContent += '"Phone","Name","Push Name"\r\n';

    for (const [key, value] of members.entries()) {
      const values = [
        value.phoneNum || "",
        value.name || "",
        value.pushname || "",
      ];
      const row = values.map((value) => `"${value}"`).join(",");
      csvContent += row + "\r\n";
    }
    console.log(csvContent);

    const encodedUri = encodeURI(csvContent);
    var link = document.createElement("a");
    link.setAttribute("href", encodedUri);
    link.setAttribute("download", "WhatsAppContacts.csv");
    document.body.appendChild(link); // Required for FF
    link.click();
  }



}

(async () => {
  const contactFinder = new ContactFinder(window.prompt("Nombre del grupo:"));
  const members = await contactFinder.getGroupMembers(); // This will return a JS Map Object
  await contactFinder.downloadMembersAsCSV(); // This will download the contacts as CSV
  console.log(_contacts);
})();
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