<template>
<div class="my-app">
  <h1>CTI OMNI</h1>
  <b-alert class="form col-md-7 col-md-offset-3" variant="danger" dismissible :show="showDismissibleAlert" @dismissed="showDismissibleAlert=false">
    {{errorMessage}}
  </b-alert>

  <div class="form col-md-4 col-md-offset-4" v-if="enterName">
    <label for="username">Введите ваше имя:</label>
    <br>
    <input id="username" type="text" class="form-control" v-model="username" v-on:keyup.enter="connectToChat">
    <br>
    <div v-if="selectedRole.label === 'Оператор'">
      <label for="password">Введите ваш пароль:</label><br>
      <input id="password" type="password" v-model="password" class="form-control" v-on:keyup.enter="connectToChat">
    </div>
    <br>
    <label for="selectedRole">Ваша роль:</label><br>
    <select id="selectedRole" v-model="selectedRole.label" class="form-control">
        <option v-for="role in roles">{{ role.label }}</option>
    </select>
    <br>
    <br>
    <div v-if="selectedRole.label === 'Клиент'">
      <button class="btn btn-primary col-md-6 col-md-offset-3" v-on:click="connectToChat">Войти в чат</button>
    </div>
    <div v-else>
      <button class="btn btn-danger col-md-6 col-md-offset-3" v-on:click="login">Войти в АРМ оператора</button>
    </div>
    <br>
    <br>
  </div>
  <div id="main-container" v-else>
    <div id="users-list">
      <h3>Пользователи онлайн:</h3>
      <ul>
        <transition-group name="user-appear">
          <li v-for="user in users" v-bind:key="user.user">
            <a @click="enterToPrivate">{{user.user}} ({{user.online_at}})</a>
          </li>
        </transition-group>
      </ul>
    </div>
    <div id="messages-list" ref="scrollbar">
      <ul>
        <transition-group name="message-appear">
          <li v-for="message in messages" v-bind:key="message">
            <div class="message-metadata">
              <span class="username">{{message.username}}</span>
              <span class="received-at">{{message.received_at}}</span>
            </div>
            {{message.body}}
          </li>
        </transition-group>
      </ul>
    </div>
    <div id="your-message">
      <input type="text" placeholder="What do you have to say?" v-model="message" v-on:keyup.enter="sendMessage">
    </div>
  </div>
</div>
</template>

<script>
import {
  Socket,
  Presence
} from "phoenix"

import gql from 'graphql-tag'

export default {
  data() {
    return {
      socket: null,
      channel: null,
      messages: [],
      message: "",
      username: "e.batogov@cti.ru",
      password: "qweasd123",
      showDismissibleAlert: false,
      errorMessage: "",
      token: "",
      userId: "",
      enterName: true,
      hello: '',
      roles: [{
          id: "customer",
          label: "Клиент"
        },
        {
          id: "operator",
          label: "Оператор"
        }
      ],
      selectedRole: {
        id: "operator",
        label: "Оператор"
      },
      users: [],
      remoteUsers: ""
    }
  },
  methods: {
    login() {
      this.$apollo.mutate({
        mutation: gql `
          mutation UserLogin($username: String!, $password: String!) {
            login(email: $username, password: $password) {
              userId
              token
            }
          }`,
        variables: {
          username: this.username,
          password: this.password
        }
      }).then((data) => {
        this.enterName = false;
        this.token = data.data.login.token;
        this.userId = data.data.login.userId;

      }).catch((error) => {
        this.enterName = true;
        this.showDismissibleAlert = true;
        this.errorMessage = "Ошибка входа в систему. Проверьте имя и пароль";
      })

      let presences = {}
      this.enterName = false;
      this.messages = [];
      this.socket = new Socket("/socket", {
          params: {
            username: this.username
          }
        }),
        this.socket.connect();

      this.channel = this.socket.channel(`room:${this.userId}`, {
        guardian_token: this.token
      });
      this.channel.on("new_msg", payload => {
        payload.received_at = new Date(payload.received_at * 1000).toLocaleString();
        this.messages.push(payload);
      });
      this.channel.on("presence_state", state => {
        presences = Presence.syncState(presences, state)
        this.assignUsers(presences)
      })
      this.channel.on("presence_diff", diff => {
        presences = Presence.syncDiff(presences, diff)
        this.assignUsers(presences)
      })
      this.channel.join()
        .receive("ok", response => {
          console.log("Joined successfully", response)
        })
        .receive("error", response => {
          console.log("Unable to join", response)
        })

    },
    sendMessage() {
      this.channel.push("new_msg", {
        body: this.message
      })
      this.message = ''
    },
    connectToChat() {
      let presences = {}
      this.enterName = false
      this.socket = new Socket("/socket", {
          params: {
            username: this.username
          }
        }),
        this.socket.connect()
      this.channel = this.socket.channel("room:lobby", {});
      this.channel.on("new_msg", payload => {
        payload.received_at = new Date(payload.received_at * 1000).toLocaleString();
        this.messages.push(payload);
        this.$nextTick(() => {
          var chatArea = this.$refs.scrollbar.$el;
          chatArea.scrollTop = chatArea.scrollHeight
        })
      });
      this.channel.on("presence_state", state => {
        presences = Presence.syncState(presences, state)
        this.assignUsers(presences)
      })
      this.channel.on("presence_diff", diff => {
        presences = Presence.syncDiff(presences, diff)
        this.assignUsers(presences)
      })
      this.channel.join()
        .receive("ok", response => {
          console.log("Joined successfully", response)
        })
        .receive("error", response => {
          console.log("Unable to join", response)
        })
    },
    assignUsers(presences) {
      let formatTimestamp = (timestamp) => {
        timestamp = parseInt(timestamp)
        let date = new Date(timestamp)
        return date.toLocaleTimeString()
      }
      this.users = Presence.list(presences, (user, {
        metas: metas
      }) => {
        return {
          user: user,
          online_at: formatTimestamp(metas[0].online_at)
        }
      })
    }
  }
}
</script>
<style lang="sass">
.my-app {
    h1 {
        text-align: center;
    }
    #main-container {
        position: absolute;
        top: 0;
        bottom: 0;
        left: 0;
        right: 0;
        display: flex;
        overflow: hidden;
    }
    #users-list {
        background-color: #008bdf;
        width: 250px;
        height: 100vh;
        overflow-y: scroll;
        h3 {
            font-size: 0.9em;
            margin-left: 10px;
            color: rgba(255, 255, 255, 0.7);
        }
        ul {
            list-style: none;
            padding-left: 20px;
            color: rgba(255, 255, 255, 0.9);
            li {
                &.user-appear-enter-active,
                &.user-appear-leave-active {
                    transition: all 0.2s;
                }
                &.user-appear-enter,
                &.user-appear-leave-active {
                    opacity: 0;
                    transform: translateX(-15px);
                }
            }
        }
    }
    #messages-list {
        padding-top: 20px;
        padding-left: 20px;
        overflow-y: scroll;
        overflow: auto ;
        flex: 1;
        ul {
            list-style: none;
            padding: 0;
            li {
                padding: 5px 0;
                &.message-appear-enter-active,
                &.message-appear-leave-active {
                    transition: all 0.2s;
                }
                &.message-appear-enter,
                &.message-appear-leave-active {
                    opacity: 0;
                    transform: translateY(20px);
                }
                .message-metadata {
                    .username {
                        font-weight: bold;
                    }
                    .received-at {
                        color: rgba(0, 0, 0, 0.4);
                        margin-left: 5px;
                        font-size: 0.9em;
                    }
                }
            }
        }
    }
    #your-message {
        position: fixed;
        bottom: 0;
        left: 250px;
        right: 0;
        background: rgba(255, 255, 255, 0.95);
        padding: 15px;
        input {
            width: 100%;
            padding: 5px 8px;
            border-radius: 3px;
            outline: 0;
            border: 1px solid #ddd;
        }
    }
}
</style>