<template>

    <section class="container">

        <item-description></item-description>

        <h1 class="title">

            {{message | capitalize}}

        </h1>

        <button @click="changeMessage" class="button">Change Message</button>

        <hr>

        <section>

            <h2>Mouse event</h2>

            <div>{{counter}}</div>

            <div @mouseover="inc">Mouse over here to change counter</div>

        </section>

        <section>

            <h2>Keyboard events</h2>

            <form @submit.prevent="submit">

                <input type="text"

                       v-model="firstName"

                       @keyup.enter="submit"

                       @keyup.alt.ctrl.shift.down="keyeventHandler"/>

                <button v-bind:disabled="buttonDisabled">{{buttonText}}</button>

            </form>

            <div>

                {{key}}

            </div>

        </section>

    </section>

</template>

<style scoped>

.title

{

  margin: 50px ;

}

</style>

<script>

  import ItemDescription from '../components/item-description';

  export default {

    data() {

      return {

        message: 'this is my vue!',

        counter: ,

        key: "",

        firstName: "",

        buttonText: "Add"

      }

    },

      computed: {

        buttonDisabled: function() {

          return this.firstName == "";

        }

      },

      watch: {

        firstName: function(){

          this.buttonText = this.firstName !== "" ? "Add " + this.firstName : "Add Dinosaur";

        }

      },

    components: {

        ItemDescription

    },

    filters: {

        capitalize(value) {

            return value.charAt().toUpperCase() + value.slice().toLowerCase();

        }

    },

    methods: {

      changeMessage() {

        this.message = "Updated message here!"

      },

      inc() {

        this.counter += ;

      },

      keyeventHandler() {

        this.key = "Ctrl + alt + shift + down is clicked"

      },

      submit() {

        console.log("form is submitted, the value is", this.firstName);

      }

    }

  }

</script>