<template>
  <v-dialog v-model="dialog" :disabled="disabled" class="fixLinkHeight" content-class="uiPopup" width="500px" max-width="100vw" persistent @keydown.esc="dialog = false">
    <a slot="activator" href="javascript:void(0);" @click="dialog = true">Backup your wallet</a>
    <v-card class="elevation-12">
      <div class="popupHeader ClearFix">
        <a class="uiIconClose pull-right" aria-hidden="true" @click="dialog = false"></a>
        <span class="PopupTitle popupTitle">Backup wallet</span>
      </div>
      <v-card-text>
        <div v-if="errorMessage" class="alert alert-error">
          <i class="uiIconError"></i>
          {{ errorMessage }}
        </div>

        <div v-if="displayCompleteMessage" class="alert alert-warning v-content">
          <p>
            <i class="uiIconWarning"></i>
            Currently your wallet is accessible only on this browser and only on this machine.
            <br/>
            You should copy the following private key to be able to:
            <br/>
            - restore your wallet in other devices/browsers
            <br/>
            - and/or restore your wallet in case you can't access your browser anymore (OS recovery, machine disk formatted, browser uninstalled ...)
          </p>
          <p>
            Please make sure to keep your wallet in a safe place where nobody else can get it (Write it in a piece of paper and hide it for example).
            <br/>
            If the following code is hacked by someone, <strong>he will be able to own all your funds</strong>.
          </p>
        </div>
        <div v-else class="alert alert-warning v-content">
          <p>
            <i class="uiIconWarning"></i>
            Please make sure to keep this private key in a safe place where nobody else can get it (Write it in a piece of paper and hide it for example).
            <br/>
            If the following code is hacked by someone, <strong>he will be able to own all your funds</strong>.
          </p>
        </div>

        <v-form ref="form">
          <v-text-field
            v-if="!autoGeneratedPassword && !walletPrivateKey"
            v-model="walletPassword"
            :append-icon="walletPasswordShow ? 'visibility_off' : 'visibility'"
            :rules="[rules.min]"
            :type="walletPasswordShow ? 'text' : 'password'"
            name="walletPassword"
            label="Current wallet password"
            placeholder="Enter your current wallet password"
            counter
            @click:append="walletPasswordShow = !walletPasswordShow"
          />
        </v-form>
      </v-card-text>
      <v-card-text class="text-xs-center">
        <wallet-address v-if="walletPrivateKey" id="walletPrivateKey" :value="walletPrivateKey" :allow-copy="false" />
      </v-card-text>
      <v-card-actions>
        <v-spacer />
        <button v-if="walletPrivateKey" class="btn btn-primary mr-1" @click="walletBackedUp">Backed up!</button>
        <button v-if="!walletPrivateKey" :disabled="loading" class="btn btn-primary mr-1" @click="showPrivateKey">Display Private Key</button>
        <button v-if="!walletPrivateKey" :disabled="loading" class="btn" @click="dialog = false">Close</button>
        <v-spacer />
      </v-card-actions>
    </v-card>
  </v-dialog>
</template>

<script>
import WalletAddress from './WalletAddress.vue';

import {unlockBrowerWallet, lockBrowerWallet, getCurrentBrowerWallet, setWalletBackedUp, hashCode} from '../WalletUtils.js';

export default {
  components: {
    WalletAddress
  },
  props: {
    displayCompleteMessage: {
      type: Boolean,
      default: function() {
        return false;
      }
    }
  },
  data() {
    return {
      dialog: false,
      errorMessage: null,
      walletPassword: '',
      walletPasswordShow: false,
      walletPrivateKey: null,
      autoGeneratedPassword: false,
      backedUp: false,
      loading: false,
      rules: {
        min: v => (v && v.length >= 8) || 'At least 8 characters'
      }
    };
  },
  watch: {
    dialog() {
      if (this.dialog) {
        if (this.$refs.form) {
          this.$refs.form.reset();
        }
        this.init();
      }
    }
  },
  created() {
    this.init();
  },
  methods: {
    init() {
      this.errorMessage = null;
      this.walletPrivateKey = null;
      this.walletPassword = '';
      this.walletPasswordShow = false;
      this.autoGeneratedPassword = window.walletSettings.userPreferences.autoGenerated;
      this.backedUp = window.walletSettings.userPreferences.backedUp;
      this.loading = false;
    },
    walletBackedUp() {
      this.$emit("copied");
      this.backedUp = window.walletSettings.userPreferences.backedUp;
      this.loading = false;
      this.dialog = false;
    },
    showPrivateKey() {
      this.errorMessage = null;
      this.loading = true;
      const unlocked = unlockBrowerWallet(this.autoGeneratedPassword ? window.walletSettings.userP : hashCode(this.walletPassword));
      try {
        if (unlocked) {
          const wallet = getCurrentBrowerWallet();
          if (!wallet || !wallet.privateKey) {
            this.errorMessage = 'Can\'t find your wallet in current browser';
            return;
          }
          this.walletPrivateKey = wallet.privateKey;
        } else if(this.autoGeneratedPassword) {
          this.errorMessage = 'Error while retrieving the private key';
        } else {
          this.errorMessage = 'Wrong password';
        }
      } finally {
        if (unlocked) {
          lockBrowerWallet();
        }
        this.loading = false;
      }
    }
  }
};
</script>