ihm_client/src/services/service.ts

// import { WebSocketClient } from '../websockets';
import { INotification } from '~/models/notification.model';
import { IProcess } from '~/models/process.model';
// import Database from './database';
import { initWebsocket, sendMessage } from '../websockets';
import { ApiReturn, Device, HandshakeMessage, Member, Process, RoleDefinition, SecretsStore, UserDiff } from '../../pkg/sdk_client';
import ModalService from './modal.service';
import Database from './database.service';
import { storeData, retrieveData, testData } from './storage.service';
import { BackUp } from '~/models/backup.model';

export const U32_MAX = 4294967295;

const BASEURL = `https://demo.4nkweb.com`;
const BOOTSTRAPURL = [`${BASEURL}/ws/`];
const STORAGEURL = `${BASEURL}/storage`
const DEFAULTAMOUNT = 1000n;

export default class Services {
  private static initializing: Promise<Services> | null = null;
  private static instance: Services;
  private currentProcess: string | null = null;
  private currentUpdateMerkleRoot: string | null = null;
  private sdkClient: any;
  private myProcesses: Set = new Set();
  private notifications: any[] | null = null;
  private subscriptions: { element: Element; event: string; eventHandler: string }[] = [];
  private database: any;
  private routingInstance!: ModalService;
  private relayAddresses: { [wsurl: string]: string } = {};
  private membersList: Record<string, Member> = {};
  // Private constructor to prevent direct instantiation from outside
  private constructor() {}

  // Method to access the singleton instance of Services
  public static async getInstance(): Promise<Services> {
    if (Services.instance) {
      return Services.instance;
    }

    if (!Services.initializing) {
      Services.initializing = (async () => {
        const instance = new Services();
        await instance.init();
        instance.routingInstance = await ModalService.getInstance();
        return instance;
      })();
    }

    console.log('initializing services');
    Services.instance = await Services.initializing;
    Services.initializing = null; // Reset for potential future use
    return Services.instance;
  }

  public async init(): Promise<void> {
    this.notifications = this.getNotifications();
    this.sdkClient = await import('../../pkg/sdk_client');
    this.sdkClient.setup();
    for (const wsurl of Object.values(BOOTSTRAPURL)) {
      this.updateRelay(wsurl, '');
    }
    await this.connectAllRelays();
  }

  /**
   * Calls `this.addWebsocketConnection` for each `wsurl` in relayAddresses.
   */
  public async connectAllRelays(): Promise<void> {
      for (const wsurl of Object.keys(this.relayAddresses)) {
          try {
              console.log(`Connecting to: ${wsurl}`);
              await this.addWebsocketConnection(wsurl);
              console.log(`Successfully connected to: ${wsurl}`);
          } catch (error) {
              console.error(`Failed to connect to ${wsurl}:`, error);
          }
      }
  }

  public async addWebsocketConnection(url: string): Promise<void> {
    console.log('Opening new websocket connection');
    await initWebsocket(url);
  }

  /**
   * Add or update a key/value pair in relayAddresses.
   * @param wsurl - The WebSocket URL (key).
   * @param spAddress - The SP Address (value).
   */
  public updateRelay(wsurl: string, spAddress: string): void {
      this.relayAddresses[wsurl] = spAddress;
      console.log(`Updated: ${wsurl} -> ${spAddress}`);
  }

  /**
   * Retrieve the spAddress for a given wsurl.
   * @param wsurl - The WebSocket URL to look up.
   * @returns The SP Address if found, or undefined if not.
   */
  public getSpAddress(wsurl: string): string | undefined {
      return this.relayAddresses[wsurl];
  }

  /**
   * Get all key/value pairs from relayAddresses.
   * @returns An array of objects containing wsurl and spAddress.
   */
  public getAllRelays(): { wsurl: string; spAddress: string }[] {
      return Object.entries(this.relayAddresses).map(([wsurl, spAddress]) => ({
          wsurl,
          spAddress,
      }));
  }

  /**
   * Print all key/value pairs for debugging.
   */
  public printAllRelays(): void {
      console.log("Current relay addresses:");
      for (const [wsurl, spAddress] of Object.entries(this.relayAddresses)) {
          console.log(`${wsurl} -> ${spAddress}`);
      }
  }

  public isPaired(): boolean {
    try {
      return this.sdkClient.is_paired();
    } catch (e) {
      throw new Error(`isPaired ~ Error: ${e}`);
    }
  }

  public async unpairDevice(): Promise<void> {
    try {
      this.sdkClient.unpair_device();
      const newDevice = this.dumpDeviceFromMemory();
      await this.saveDeviceInDatabase(newDevice);
    } catch (e) {
      throw new Error(`Failed to unpair device: ${e}`);
    }
  }

  public async getSecretForAddress(address: string): Promise<string | null> {
    const db = await Database.getInstance();
    return await db.getObject('shared_secrets', address);
  }

  public async getAllSecrets(): Promise<SecretsStore> {
    const db = await Database.getInstance();
    const sharedSecrets = await db.dumpStore('shared_secrets');
    const unconfirmedSecrets = await db.dumpStore('unconfirmed_secrets'); // keys are numeric values

    const secretsStore = {
      shared_secrets: sharedSecrets,
      unconfirmed_secrets: Object.values(unconfirmedSecrets),
    };

    return secretsStore;
  }

  public async getAllDiffs(): Promise<Record<string, UserDiff>> {
    const db = await Database.getInstance();
    return await db.dumpStore('diffs');
  }

  public async getDiffByValue(value: string): Promise<UserDiff | null> {
    const db = await Database.getInstance();
    const store = 'diffs';
    const res = await db.getObject(store, value);
    return res;
  }

  public async checkConnections(members: Member[]): Promise<void> {
    // Ensure the amount is available before proceeding
    try {
      await this.ensureSufficientAmount();
    } catch (e) {
      console.error('Failed to get tokens from relay, check connection');
      return;
    }
    let unconnectedAddresses = [];
    for (const member of members) {
      for (const address of member.sp_addresses) {
        const sharedSecret = await this.getSecretForAddress(address);
        if (!sharedSecret) {
          unconnectedAddresses.push(address);
        }
      }
    }
    if (unconnectedAddresses && unconnectedAddresses.length != 0) {
      const apiResult = await this.connectAddresses(unconnectedAddresses);
      await this.handleApiReturn(apiResult);
    }
  }

  public async connectAddresses(addresses: string[]): Promise<ApiReturn> {
    if (addresses.length === 0) {
      throw new Error('Trying to connect to empty addresses list');
    }

    try {
      return this.sdkClient.create_connect_transaction(addresses, 1);
    } catch (e) {
      console.error('Failed to connect member:', e);
      throw e;
    }
  }

  private async ensureSufficientAmount(): Promise<void> {
    const availableAmt = this.getAmount();
    const target: BigInt = DEFAULTAMOUNT * BigInt(10);

    if (availableAmt < target) {
      const faucetMsg = this.createFaucetMessage();
      this.sendFaucetMessage(faucetMsg);

      await this.waitForAmount(target);
    }
  }

  private async waitForAmount(target: BigInt): Promise<BigInt> {
    let attempts = 3;

    while (attempts > 0) {
      const amount = this.getAmount();
      if (amount >= target) {
        return amount;
      }

      attempts--;
      if (attempts > 0) {
        await new Promise((resolve) => setTimeout(resolve, 1000)); // Wait for 1 second
      }
    }

    throw new Error('Amount is still 0 after 3 attempts');
  }

  public async createPairingProcess(userName: string, pairWith: string[], relayAddress: string, feeRate: number): Promise<ApiReturn> {
    if (this.sdkClient.is_paired()) {
      throw new Error('Device already paired');
    }
    const myAddress: string = this.sdkClient.get_address();
    pairWith.push(myAddress);
    const roles: Record<string, RoleDefinition> = {
      pairing: {
        members: [{ sp_addresses: pairWith }],
        validation_rules: [
          {
            quorum: 1.0,
            fields: ['description', 'counter'],
            min_sig_member: 1.0,
          },
        ],
        storages: [STORAGEURL]
      },
    };
    const pairingTemplate = {
      description: 'pairing',
      counter: 0,
    };
    const publicData = {
      memberPublicName: userName 
    }
    try {
      return this.sdkClient.create_new_process(
        JSON.stringify(pairingTemplate), 
        roles, 
        publicData, 
        relayAddress, 
        feeRate
      ); 
    } catch (e) {
      throw new Error(`Creating process failed:, ${e}`);
    }
  }

  public async createDmProcess(
      otherMember: string[], 
  ): Promise<ApiReturn> {
    if (otherMember.length === 0) {
      throw new Error('Can\'t open dm with empty user');
    }
    try {
        console.log('🚀 Début createDmProcess');
        console.log('👥 Other Member:', otherMember);

        if (!this.isPaired()) {
            throw new Error('Device not paired');
        }

        const myAddresses = await this.getMemberFromDevice();
        console.log('🔑 Mes adresses:', myAddresses);

        if (!myAddresses) {
            throw new Error('No paired member found');
        }

        const roles = {
          dm: {
              members: [
                  { sp_addresses: myAddresses },
                  { sp_addresses: otherMember }
              ],
              validation_rules: [
                  {
                      quorum: 0.01,
                      fields: ['message', 'description'],
                      min_sig_member: 0.01,
                  },
              ],
              storages: [STORAGEURL]
          }
        }

        const dmTemplate = {
            description: 'dm',
            message: '',
        };

        console.log('📋 Template final:', JSON.stringify(dmTemplate, null, 2));

        const relayAddress = this.getAllRelays()[0]['spAddress'];
        const feeRate = 1;
        const initState = JSON.stringify(dmTemplate);

        await this.checkConnections ([{ sp_addresses: otherMember }]);

        const result = this.sdkClient.create_new_process (
            initState, 
            roles,
            {},
            relayAddress, 
            feeRate
        );

        return result;
        
    } catch (e) {
        console.error('❌ Erreur:', e);
        throw e;
    }
  }

  public async updateProcess(process: Process, new_state: any, roles: Record<string, RoleDefinition> | null): Promise<ApiReturn> {
    // If roles is null, we just take the last commited state roles
    if (!roles) {
      roles = this.getRoles(process);
    } else {
      // We should check that we have the right to change the roles here, or maybe it's better leave it to the wasm
      console.log('Provided new roles:', JSON.stringify(roles));
    }
    console.log(roles);
    let members = new Set();
    for (const role of Object.values(roles)) {
      for (const member of role.members) {
        members.add(member)
      }
    }
    console.log(members);
    await this.checkConnections([...members]);
    try {
      console.log(process);
      return this.sdkClient.update_process(process, new_state, roles, {});
    } catch (e) {
      throw new Error(`Failed to update process: ${e}`);
    }
  }

  // Create prd update for current process and update
  public createPrdUpdate(processId: string, stateId: string): ApiReturn {
    try {
      return this.sdkClient.create_update_message(processId, stateId);
    } catch (e) {
      throw new Error(`Failed to create prd update: ${e}`);
    }
  }

  public createPrdResponse(pcdMerkleRoot: string): ApiReturn {
    if (!this.currentProcess) {
      throw new Error('No current process defined');
    }

    try {
      return this.sdkClient.create_response_prd(this.currentProcess, pcdMerkleRoot);
    } catch (e) {
      throw e;
    }
  }

  public async approveChange(processId: string, stateId: string): Promise<ApiReturn> {
    const process = await this.getProcess(processId);
    if (!process) {
      throw new Error('Failed to get process from db');
    }
    try {
      return this.sdkClient.validate_state(process, stateId);
    } catch (e) {
      throw new Error(`Failed to create prd response: ${e}`);
    }
  }

  public async rejectChange(processId: string, stateId: string): Promise<ApiReturn> {
    const process = await this.getProcess(processId);
    if (!process) {
      throw new Error('Failed to get process from db');
    }
    try {
      return this.sdkClient.refuse_state(process, stateId);
    } catch (e) {
      throw new Error(`Failed to create prd response: ${e}`);
    }
  }

  async resetDevice() {
    this.sdkClient.reset_device();

    // Clear all stores
    const db = await Database.getInstance();
    await db.clearStore('wallet');
    await db.clearStore('shared_secrets');
    await db.clearStore('unconfirmed_secrets');
    await db.clearStore('processes');
    await db.clearStore('diffs');
  }

  async sendNewTxMessage(message: string) {
    sendMessage('NewTx', message);
  }

  async sendCommitMessage(message: string) {
    sendMessage('Commit', message);
  }

  async sendCipherMessages(ciphers: string[]) {
    for (let i = 0; i < ciphers.length; i++) {
      const cipher = ciphers[i];
      sendMessage('Cipher', cipher);
    }
  }

  sendFaucetMessage(message: string): void {
    sendMessage('Faucet', message);
  }

  async parseCipher(message: string) {
    try {
      // console.log('parsing new cipher');
      const apiReturn = this.sdkClient.parse_cipher(message);
      console.log('🚀 ~ Services ~ parseCipher ~ apiReturn:', apiReturn);
      await this.handleApiReturn(apiReturn);

      // Device 1 wait Device 2
      const waitingModal = document.getElementById('waiting-modal');
      if (waitingModal) {
        this.device2Ready = true;
      }

    } catch (e) {
      console.error(`Parsed cipher with error: ${e}`);
    }
    // await this.saveCipherTxToDb(parsedTx)
  }

  async parseNewTx(tx: string) {
    try {
      const parsedTx = this.sdkClient.parse_new_tx(tx, 0);
      if (parsedTx) {
        try {
          await this.handleApiReturn(parsedTx);
          const newDevice = this.dumpDeviceFromMemory();
          await this.saveDeviceInDatabase(newDevice);
        } catch (e) {
          console.error('Failed to update device with new tx');
        }
      }
    } catch (e) {
      console.trace(e);
    }
  }

  public async handleApiReturn(apiReturn: ApiReturn) {
    console.log(apiReturn);
    if (apiReturn.new_tx_to_send && apiReturn.new_tx_to_send.transaction.length != 0) {
      await this.sendNewTxMessage(JSON.stringify(apiReturn.new_tx_to_send));
      await new Promise(r => setTimeout(r, 500));
    }

    if (apiReturn.secrets) {
      const unconfirmedSecrets = apiReturn.secrets.unconfirmed_secrets;
      const confirmedSecrets = apiReturn.secrets.shared_secrets;

      const db = await Database.getInstance();
      for (const secret of unconfirmedSecrets) {
        await db.addObject({
          storeName: 'unconfirmed_secrets',
          object: secret,
          key: null,
        });
      }
      const entries = Object.entries(confirmedSecrets).map(([key, value]) => ({ key, value }));
      for (const entry of entries) {
        try {
          await db.addObject({
            storeName: 'shared_secrets',
            object: entry.value,
            key: entry.key,
          });
        } catch (e) {
          throw e;
        }

        // We don't want to throw an error, it could simply be that we registered directly the shared secret
        // this.removeUnconfirmedSecret(entry.value);
      }
    }

    if (apiReturn.updated_process) {
      const updatedProcess = apiReturn.updated_process;

      const processId: string = updatedProcess.process_id;

      if (updatedProcess.encrypted_data && Object.keys(updatedProcess.encrypted_data).length != 0) {
        for (const [hash, cipher] of Object.entries(updatedProcess.encrypted_data)) {
          console.log(hash);
          console.log(cipher);
          const blob = this.hexToBlob(cipher);
          try {
            await this.saveBlobToDb(hash, blob);
          } catch (e) {
            console.error(e);
          }
        }
      }

      // Save process to db
      await this.saveProcessToDb(processId, updatedProcess.current_process);

      const isPaired = this.isPaired();
      
      if (updatedProcess.diffs && updatedProcess.diffs.length != 0) {
        try {
          await this.saveDiffsToDb(updatedProcess.diffs);
        } catch (e) {
          console.error('Failed to save diffs to db:', e);
        }
        if (!isPaired) {
          console.log(updatedProcess);
          await this.openPairingConfirmationModal(updatedProcess.current_process.states[0]);
        }
      }
    }

    if (apiReturn.push_to_storage && apiReturn.push_to_storage.length != 0) {
      for (const hash of apiReturn.push_to_storage) {
        const blob = await this.getBlobFromDb(hash);
        if (blob) {
          await this.saveDataToStorage(hash, blob, null);
        } else {
          console.error('Failed to get data from db');
        }
      }
    }

    if (apiReturn.commit_to_send) {
      const commit = apiReturn.commit_to_send;
      await this.sendCommitMessage(JSON.stringify(commit));
    }

    if (apiReturn.ciphers_to_send && apiReturn.ciphers_to_send.length != 0) {
      await this.sendCipherMessages(apiReturn.ciphers_to_send);
    }
  }

  public async openPairingConfirmationModal(firstState: ProcessState) {
    const roles = firstState.roles;
    const processId = firstState.commited_in;
    const stateId = firstState.state_id;
    try {
      await this.routingInstance.openPairingConfirmationModal(roles, processId, stateId);
    } catch (e) {
      console.error(e);
    }
  }

  pairDevice(spAddressList: string[], pairingProcess: string) {
    try {
      this.sdkClient.pair_device(pairingProcess, spAddressList);
    } catch (e) {
      throw new Error(`Failed to pair device: ${e}`);
    }
  }

  public getAmount(): BigInt {
    const amount = this.sdkClient.get_available_amount();
    return amount;
  }

  async getDeviceAddress() {
    return await this.sdkClient.get_address();
  }

  public dumpDeviceFromMemory(): string {
    try {
      return this.sdkClient.dump_device();
    } catch (e) {
      throw new Error(`Failed to dump device: ${e}`);
    }
  }

  public getPairingProcessId(): string {
    try {
      return this.sdkClient.get_pairing_process_id();
    } catch (e) {
      throw new Error(`Failed to get pairing process: ${e}`);
    }
  }

  async saveDeviceInDatabase(device: any): Promise<void> {
    const db = await Database.getInstance();
    const walletStore = 'wallet';
    try {
      const prevDevice = await this.getDeviceFromDatabase();
      if (prevDevice) {
        await db.deleteObject(walletStore, "1");
      }
      await db.addObject({
        storeName: walletStore,
        object: { pre_id: '1', device },
        key: null,
      });
    } catch (e) {
      console.error(e);
    }
  }

  async getDeviceFromDatabase(): Promise<string | null> {
    const db = await Database.getInstance();
    const walletStore = 'wallet';
    try {
      const dbRes = await db.getObject(walletStore, '1');
      if (dbRes) {
        const wallet = dbRes['device'];
        return wallet;
      } else {
        return null;
      }
    } catch (e) {
      throw new Error(`Failed to retrieve device from db: ${e}`);
    }
  }

  async getMemberFromDevice(): Promise<string[] | null> {
    try {
      const device = await this.getDeviceFromDatabase();
      if (device) {
        const parsed: Device = JSON.parse(device);
        const pairedMember = parsed['paired_member']; 
        return pairedMember.sp_addresses;
      } else {
        return null;
      }
    } catch (e) {
      throw new Error(`Failed to retrieve paired_member from device: ${e}`);
    }
  }

  isChildRole(parent: any, child: any): boolean {
    try {
      this.sdkClient.is_child_role(JSON.stringify(parent), JSON.stringify(child));
    } catch (e) {
      console.error(e);
      return false;
    }

    return true;
  }

  rolesContainsUs(roles: any): boolean {
    try {
      this.sdkClient.roles_contains_us(JSON.stringify(roles));
    } catch (e) {
      return false;
    }

    return true;
  }

  rolesContainsMember(roles: any, member: string[]): boolean {
    try {
      this.sdkClient.roles_contains_member(JSON.stringify(roles), member);
    } catch (e) {
      return false;
    }

    return true;
  }

  async dumpWallet() {
    const wallet = await this.sdkClient.dump_wallet();
    console.log('🚀 ~ Services ~ dumpWallet ~ wallet:', wallet);
    return wallet;
  }

  public createFaucetMessage() {
    const message = this.sdkClient.create_faucet_msg();
    console.log('🚀 ~ Services ~ createFaucetMessage ~ message:', message);
    return message;
  }

  async createNewDevice() {
    let spAddress = '';
    try {
      spAddress = await this.sdkClient.create_new_device(0, 'signet');
      const device = this.dumpDeviceFromMemory();
      console.log('🚀 ~ Services ~ device:', device);
      await this.saveDeviceInDatabase(device);
    } catch (e) {
      console.error('Services ~ Error:', e);
    }

    return spAddress;
  }

  restoreDevice(device: string) {
    try {
      this.sdkClient.restore_device(device);
      const spAddress = this.sdkClient.get_address();
    } catch (e) {
      console.error(e);
    }
  }

  private async removeProcess(processId: string): Promise<void> {
    const db = await Database.getInstance();
    const storeName = 'processes';

    try {
      await db.deleteObject(storeName, processId);
    } catch (e) {
      console.error(e);
    }
  }

  public async saveProcessToDb(processId: string, process: Process) {
    const db = await Database.getInstance();
    try {
      await db.addObject({
        storeName: 'processes',
        object: process,
        key: processId,
      });
    } catch (e) {
      console.error(`Failed to save process ${processId}: ${e}`);
    }
  }

  public async saveBlobToDb(hash: string, data: Blob) {
    const db = await Database.getInstance();
    try {
      await db.addObject({
        storeName: 'data',
        object: data,
        key: hash,
      });
    } catch (e) {
      console.error(`Failed to save data to db: ${e}`);
    }
  } 

  public async getBlobFromDb(hash: string): Promise<Blob | null> {
    const db = await Database.getInstance();
    try {
      return await db.getObject('data', hash);
    } catch (e) {
      return null;
    }
  }

  public async saveDataToStorage(hash: string, data: Blob, ttl: number | null) {
    const storages = [STORAGEURL];

    try {
      await storeData(storages, hash, data, ttl);
    } catch (e) {
      console.error(`Failed to store data with hash ${hash}: ${e}`);
    }
  }

  public async fetchValueFromStorage(hash: string): Promise<any | null> {
    const storages = [STORAGEURL];

    return await retrieveData(storages, hash);
  }

  public async testDataInStorage(hash: string): Promise<Record<string, boolean | null> | null> {
    const storages = [STORAGEURL];

    return await testData(storages, hash);
  }

  public async saveDiffsToDb(diffs: UserDiff[]) {
    const db = await Database.getInstance();
    try {
      for (const diff of diffs) {
        await db.addObject({
          storeName: 'diffs',
          object: diff,
          key: null,
        });
      }
    } catch (e) {
      throw new Error(`Failed to save process: ${e}`);
    }
  }

  public async getProcess(commitedIn: string): Promise<Process> {
    const db = await Database.getInstance();
    return await db.getObject('processes', commitedIn);
  }

  public async getProcesses(): Promise<Record<string, Process>> {
    const db = await Database.getInstance();

    const processes: Record<string, Process> = await db.dumpStore('processes');
    return processes;
  }

  public async getChildrenOfProcess(processId: string): Promise<string[]> {
    const processes = await this.getProcesses();

    const res = [];
    for (const [hash, process] of Object.entries(processes)) {
      const firstState = process.states[0];
      const pcdCommitment = firstState['pcd_commitment'];
      try {
        const parentIdHash = pcdCommitment['parent_id'];
        const diff = await this.getDiffByValue(parentIdHash);
        if (diff && diff['new_value'] === processId) {
          res.push(JSON.stringify(process));
        }
      } catch (e) {
        continue;
      }
    }

    return res;
  }

  public async restoreProcessesFromBackUp(processes: Record<string, Process>) {
    const db = await Database.getInstance();
    for (const [commitedIn, process] of Object.entries(processes)) {
      await db.addObject({ storeName: 'processes', object: process, key: commitedIn});
    }

    await this.restoreProcessesFromDB();
  }

  // Restore process in wasm with persistent storage
  public async restoreProcessesFromDB() {
    const db = await Database.getInstance();
    try {
      const processes: Record<string, Process> = await db.dumpStore('processes');
      if (processes && Object.keys(processes).length != 0) {
        console.log(`Restoring ${Object.keys(processes).length} processes`);
        this.sdkClient.set_process_cache(JSON.stringify(processes));
      } else {
        console.log('No processes to restore!');
      }
    } catch (e) {
      throw e;
    }
  }

  public async clearSecretsFromDB() {
    const db = await Database.getInstance();
    try {
      await db.clearStore('shared_secrets');
      await db.clearStore('unconfirmed_secrets');
    } catch (e) {
      console.error(e);
    }
  }

  public async restoreSecretsFromBackUp(secretsStore: SecretsStore) {
    const db = await Database.getInstance();

    for (const secret of secretsStore.unconfirmed_secrets) {
      await db.addObject({
        storeName: 'unconfirmed_secrets',
        object: secret,
        key: null,
      });
    }
    const entries = Object.entries(secretsStore.shared_secrets).map(([key, value]) => ({ key, value }));
    for (const entry of entries) {
      await db.addObject({
        storeName: 'shared_secrets',
        object: entry.value,
        key: entry.key,
      });
    }

    // Now we can transfer them to memory 
    await this.restoreSecretsFromDB();
  }

  public async restoreSecretsFromDB() {
    const db = await Database.getInstance();
    try {
      const sharedSecrets: Record<string, string> = await db.dumpStore('shared_secrets');
      const unconfirmedSecrets = await db.dumpStore('unconfirmed_secrets');
      const secretsStore = {
        shared_secrets: sharedSecrets,
        unconfirmed_secrets: Object.values(unconfirmedSecrets),
      };
      this.sdkClient.set_shared_secrets(JSON.stringify(secretsStore));
    } catch (e) {
      throw e;
    }
  }

  async decryptAttribute(processId: string, state: ProcessState, attribute: string): Promise<string | null> {
    let hash = state.pcd_commitment[attribute];
    let key = state.keys[attribute];

    // If hash or key is missing, request an update and then retry
    if (!hash || !key) {
      await this.requestDataFromPeers(processId, [state.state_id], [state.roles]);

      const maxRetries = 5;
      const retryDelay = 500; // delay in milliseconds
      let retries = 0;
      
      while ((!hash || !key) && retries < maxRetries) {
        await new Promise(resolve => setTimeout(resolve, retryDelay));
        // Re-read hash and key after waiting
        hash = state.pcd_commitment[attribute];
        key = state.keys[attribute];
        retries++;
      }
    }

    if (hash && key) {
      const blob = await this.getBlobFromDb(hash);
      if (blob) {
        // Decrypt the data
        const buf = await blob.arrayBuffer();
        const cipher = new Uint8Array(buf);
        const keyBlob = this.hexToBlob(key);
        const keyBuf = await keyBlob.arrayBuffer();
        
        const clear = this.sdkClient.decrypt_data(new Uint8Array(keyBuf), cipher);
        if (clear) {
          // Parse the stringified JSON
          return JSON.parse(clear);
        }
      }
    }
    
    return null;
  }

  getNotifications(): any[] | null {
    // return [
    //   {
    //     id: 1,
    //     title: 'Notif 1',
    //     description: 'A normal notification',
    //     sendToNotificationPage: false,
    //     path: '/notif1',
    //   },
    //   {
    //     id: 2,
    //     title: 'Notif 2',
    //     description: 'A normal notification',
    //     sendToNotificationPage: false,
    //     path: '/notif2',
    //   },
    //   {
    //     id: 3,
    //     title: 'Notif 3',
    //     description: 'A normal notification',
    //     sendToNotificationPage: false,
    //     path: '/notif3',
    //   },
    // ];
    return this.notifications;
  }

  setNotifications(notifications: any[]) {
    this.notifications = notifications;
  }

  async importJSON(backup: BackUp): Promise<void> {
    const device = JSON.stringify(backup.device);

    // Reset current device
    await this.resetDevice();

    await this.saveDeviceInDatabase(device);
    
    this.restoreDevice(device);

    // TODO restore secrets and processes from file
    const secretsStore = backup.secrets;
    await this.restoreSecretsFromBackUp(secretsStore);

    const processes = backup.processes;
    await this.restoreProcessesFromBackUp(processes);
  }

  public async createBackUp(): Promise<BackUp | null> {
    // Get the device from indexedDB
    const deviceStr = await this.getDeviceFromDatabase();
    if (!deviceStr) {
      console.error('No device loaded');
      return null;
    }

    const device: Device = JSON.parse(deviceStr);

    // Get the processes
    const processes = await this.getProcesses();

    // Get the shared secrets
    const secrets = await this.getAllSecrets();

    // Create a backup object
    const backUp = {
      device: device,
      secrets: secrets,
      processes: processes,
    };

    return backUp;
  }

  // Device 1 wait Device 2
  public device1: boolean = false;
  public device2Ready: boolean = false;

  public resetState() {
    this.device1 = false;
    this.device2Ready = false;
  }


  // Handle the handshake message
  public async handleHandshakeMsg(url: string, parsedMsg: any) {
    try {
      const handshakeMsg: HandshakeMessage = JSON.parse(parsedMsg);
      this.updateRelay(url, handshakeMsg.sp_address);
      const members = handshakeMsg.peers_list;
      if (this.membersList && Object.keys(this.membersList).length === 0) {
        // We start from an empty list, just copy it over
        this.membersList = handshakeMsg.peers_list;
      } else {
        // We are incrementing our list
        for (const [processId, member] of Object.entries(handshakeMsg.peers_list)) {
          this.membersList[processId] = member as Member;
        }
      }

      setTimeout(async () => {
        const newProcesses = handshakeMsg.processes_list;
        if (newProcesses && Object.keys(newProcesses).length !== 0) { 
          for (const [processId, process] of Object.entries(newProcesses)) {
            const existing = await this.getProcess(processId);
            if (existing) {
              // Look for state id we don't know yet
              let new_states = [];
              let roles = [];
              for (const state of process.states) {
                if (!this.lookForStateId(existing, state.state_id)) {

                  new_states.push(state.state_id);
                  roles.push(state.roles);
                }
              }

              if (new_states.length != 0) {
                // We request the new states
                await this.requestDataFromPeers(processId, new_states, roles);
              }

              // Otherwise we're probably just in the initial loading at page initialization

              // We may learn an update for this process
              // TODO maybe actually check if what the relay is sending us contains more information than what we have
              // relay should always have more info than us, but we never know
              // For now let's keep it simple and let the worker do the job
            } else {
              // We add it to db
              console.log(`Saving ${processId} to db`);
              await this.saveProcessToDb(processId, process as Process);
            }
          }
        }
      }, 500)
    } catch (e) {
      console.error('Failed to parse init message:', e);
    }
  }

  private lookForStateId(process: Process, stateId: string): boolean {
    for (const state of process.states) {
      if (state.state_id === stateId) {
        return true;
      }
    }

    return false;
  }

  /**
   * Retourne la liste de tous les membres ordonnés par leur process id
   * @returns Un tableau contenant tous les membres
   */
  public getAllMembersSorted(): Record<string, Member> {
    return Object.fromEntries(
        Object.entries(this.membersList).sort(([keyA], [keyB]) => keyA.localeCompare(keyB))
    );
  }

  public getAllMembers(): Record<string, Member> {
    return this.membersList;
  }

  public getAddressesForMemberId(memberId: string): string[] | null {
    return this.membersList[memberId];
  }

  public compareMembers(memberA: string[], memberB: string[]): boolean {
    if (!memberA || !memberB) { return false }
    if (memberA.length !== memberB.length) { return false }

    const res = memberA.every(item => memberB.includes(item)) && memberB.every(item => memberA.includes(item));

    return res;
  }

  public async handleCommitError(response: string) {
    const content = JSON.parse(response);
    const error = content.error;
    const errorMsg = error['GenericError'];
    if (errorMsg === 'State is identical to the previous state') {
      return;
    } else if (errorMsg === 'Not enough valid proofs') { return; }
    // Wait and retry
    setTimeout(async () => {
      await this.sendCommitMessage(JSON.stringify(content));
    }, 1000)
  }

  
  public getRoles(process: Process): Record<string, RoleDefinition> | null {
    const lastCommitedState = this.getLastCommitedState(process);
    if (lastCommitedState && lastCommitedState.roles && Object.keys(lastCommitedState.roles).length != 0) {
      return lastCommitedState!.roles;
    } else {
      return null;
    }
  }

  public getPublicData(process: Process): Record<string, any> | null {
    const lastCommitedState = this.getLastCommitedState(process);
    if (lastCommitedState && lastCommitedState.public_data) {
      return lastCommitedState.public_data;
    } else {
      return null;
    }
  }

  public getProcessName(process: Process): string | null {
    const lastCommitedState = this.getLastCommitedState(process);
    if (lastCommitedState && lastCommitedState.public_data) {
      const processName = lastCommitedState!.public_data['processName'];
      if (processName) { return processName }
      else { return null }
    } else {
      return null;
    }
  }

  public async getMyProcesses(): Promise<string[]> {
    try {
      const processes = await this.getProcesses();

      for (const [processId, process] of Object.entries(processes)) {
        // We use myProcesses attribute to not reevaluate all processes everytime
        if (this.myProcesses && this.myProcesses.has(processId)) {
          continue;
        }
        try {
          const roles = this.getRoles(process);

          if (this.rolesContainsUs(roles)) {
            this.myProcesses.add(processId);
          }
        } catch (e) {
          console.error(e);
        }
      }
      return Array.from(this.myProcesses);
    } catch (e) {
      console.error("Failed to get processes:", e);
    }
  }

  public async requestDataFromPeers(processId: string, stateIds: string[], roles: Record<string, RoleDefinition>[]) {
    console.log('Requesting data from peers');
    console.log(roles);
    try {
      const res = this.sdkClient.request_data(processId, stateIds, roles);
      await this.handleApiReturn(res);
    } catch (e) {
      console.error(e);
    }
  }

  public hexToBlob(hexString: string): Blob {
    if (hexString.length % 2 !== 0) {
      throw new Error("Invalid hex string: length must be even");
    }
    const uint8Array = new Uint8Array(hexString.length / 2);
    for (let i = 0; i < hexString.length; i += 2) {
      uint8Array[i / 2] = parseInt(hexString.substr(i, 2), 16);
    }

    return new Blob([uint8Array], { type: "application/octet-stream" });
  }

  public async blobToHex(blob: Blob): Promise<string> {
    const buffer = await blob.arrayBuffer();
    const bytes = new Uint8Array(buffer);
    return Array.from(bytes)
      .map(byte => byte.toString(16).padStart(2, '0'))
      .join('');
  }

  public getLastCommitedState(process: Process): ProcessState {
    if (process.states.length === 0) return null;
    const processTip = process.states[process.states.length - 1].commited_in;
    const lastCommitedState = process.states.findLast(state => state.commited_in !== processTip);
    if (lastCommitedState) {
      return lastCommitedState;
    } else {
      console.error('Can\'t find last commited state');
      return null;
    }
  }

  public isPairingProcess(roles: Record<string, RoleDefinition>): boolean {
    if (Object.keys(roles).length != 1) { return false }
    const pairingRole = roles['pairing'];
    if (pairingRole) {
      // For now that's enough, we should probably test more things
      return true;
    } else {
      return false;
    }
  }
}