import localforage from 'localforage';
import { WalletNotConnectedError, WalletNotReadyError, WalletReadyState } from '@solana/wallet-adapter-base';

export const SolanaWalletHandler = class {
  constructor() {
    this.name = null;
    this.publicKey = null;
    this.isConnected = false;
    this.isConnecting = false;
    this.isDisconnecting = false;
    this.ready = 'Unsupported';
    this.localStorageKey = 'walletAdapter'
    this.adapter = null;
    this.wallets = [];
    this.signTransaction = undefined;
    this.signAllTransactions = undefined;
    this.signMessage = undefined;

    /** @type {LocalForage} */
    this.store = localforage.createInstance({
      name: "tp-solana-connect"
    });
  }

  async connect() {
    if (this.isConnected || this.isConnecting || this.isDisconnecting) return;

    if (!adapter) throw new WalletNotReadyError();

    if (!(this.ready === WalletReadyState.Installed || this.ready === WalletReadyState.Loadable)) {
        this.resetWallet();

        if (typeof window !== 'undefined') {
          window.open(adapter.url, '_blank');
        }

        throw new WalletNotReadyError();
    }

    try {
        this.isConnecting = true;
        await adapter.connect();
    } catch (error) {
        walletStore.resetWallet();
        throw error;
    } finally {
        this.isConnecting = false;
    }
  }

  async autoConnect() {
    try {
      this.isConnecting = true;
      await this.adapter.connect();
    }
    catch (error) {
      this.resetWallet();
    }
    finally {
      this.isConnecting = false;
    }
}

  async disconnect() {
    if (this.disconnecting) return;
    if (!this.adapter) return this.resetWallet();

    try {
        this.isDisconnecting = true;
        await this.adapter.disconnect();
    }
    finally {
        this.resetWallet();
        this.isDisconnecting = false;
    }
  }

  updateAdapter(adapter) {
    removeAdapterEventListeners();
    if (adapter) {
      this.addAdapterEventListeners(adapter);
      this.adapter = adapter;
    }
  }

  resetWallet() {
    this.isConnected = false;
    this.isConnecting = false;
    this.isDisconnecting = false;
    this.ready = 'Unsupported';
    this.adapter = null;
    this.store.setItem('wallet', null);
  }

  addAdapterEventListeners(adapter) {
    this.wallets.forEach(({ adapter }) => {
        adapter.on('readyStateChange', this.onReadyStateChange, adapter);
    });

    adapter.on('connect', onConnect);
    adapter.on('disconnect', onDisconnect);
    adapter.on('error', onError);
  }

  removeAdapterEventListeners() {
    if (!this.adapter) return;

    this.wallets.forEach(({ adapter }) => {
      adapter.off('readyStateChange', this.onReadyStateChange, adapter);
    });

    this.adapter.off('connect', onConnect);
    this.adapter.off('disconnect', onDisconnect);
    this.adapter.off('error', onError);
  }

  onReadyStateChange(readyState) {
    if (!this.adapter) return;

    this.ready = adapter.readyState;

    // When the wallets change, start to listen for changes to their `readyState`
    const walletIndex = this.wallets.findIndex(({ adapter }) => adapter.name === this.name);
    if (walletIndex === -1) {
      return;
    }

    this.wallets = [
      ...this.wallets.slice(0, walletIndex),
      { ...this.wallets[walletIndex], readyState },
      ...this.wallets.slice(walletIndex + 1),
    ];
  }

  async select(walletName) {
    if (this.name === walletName) return;

    if (this.adapter) {
      await disconnect();
    }

    walletStore.updateWallet(walletName);
  }

  updateWalletName(name) {
    var _a;
    const adapter = (_a = this.walletsByName === null || this.walletsByName === undefined ? undefined : walletsByName[name]) !== null && _a !== void 0 ? _a : null;
    this.store.setItem(this.localStorageKey, name);
    updateWalletState(adapter);
  }

  updateWalletState(adapter) {
    this.updateAdapter(adapter);
    this.name = adapter?.name || null;
    this.ready = adapter?.readyState || 'Unsupported';
    this.publicKey = adapter?.publicKey || null;
    this.connected = adapter?.connected || false;
  }

  onConnect() {
    if (!this.adapter) return;

    walletStore.updateFeatures(adapter);
    walletStore.updateStatus({
        publicKey: adapter.publicKey,
        connected: adapter.connected,
    });
  }

  updateFeatures() {
    if (!this.adapter) return;

    this.signTransaction = undefined;
    this.signAllTransactions = undefined;
    this.signMessage = undefined;

    // Sign a transaction if the wallet supports it
    if ('signTransaction' in this.adapter) {
      this.signTransaction = async function (transaction) {
          if (!this.connected)  throw new WalletNotConnectedError();
          return await this.adapter.signTransaction(transaction);
      };
    }
    // Sign multiple transactions if the wallet supports it
    if ('signAllTransactions' in this.adapter) {
        this.signAllTransactions = async function (transactions) {
            if (!this.connected) throw newError(new WalletNotConnectedError());
            return await this.adapter.signAllTransactions(transactions);
        };
    }
    // Sign an arbitrary message if the wallet supports it
    if ('signMessage' in this.adapter) {
        this.signMessage = async function (message) {
            if (!this.connected) throw newError(new WalletNotConnectedError());
            return await this.adapter.signMessage(message);
        };
    }
  }

  removeAdapterEventListeners() {
    if (!this.adapter) return;

    this.wallets.forEach(({ adapter }) => {
        adapter.off('readyStateChange', this.onReadyStateChange, adapter);
    });

    this.adapter.off('connect', this.onConnect);
    this.adapter.off('disconnect', this.onDisconnect);
    this.adapter.off('error', this.onError);
  }

  shouldAutoConnect() {
    const { adapter, ready, connected, connecting } = this;

    const _autoConnect = (adapter && typeof autoConnect === 'function') ? this.autoConnect(adapter) : autoConnect;
    return !(!_autoConnect ||
      !adapter ||
      !(ready === WalletReadyState.Installed ||
        ready === WalletReadyState.Loadable) ||
      connected ||
      connecting);
  }
}

export const walletMixin = function(superClass) {
  return class extends superClass {
    constructor() {
      super();

      if (this.walletStore === undefined) {
        this.walletStore = new SolanaWalletHandler();
      }
    }
  }
}