let eventBus = new Vue(
);






Vue.component('product', {
    props: {
        premium: {
            type: Boolean,
            required: true
        }
    },

    template: `
	 <div class="product">
        <div class="product-image">
            <img :src="image" :alt="altText"/>
        </div>

        <div class="product-info">
            <h1>{{ title }}</h1>
      
            <p v-if="inStock">In stock</p>
            <p v-else>Out of Stock</p>
           
 <p>Shipping: {{ shipping }}</p>
 
  <product-details></product-details>
 
            <div
                    class="color-box"
                    v-for="(variant, index) in variants"
                    :key="variant.variantId"
                    :style="{ backgroundColor:variant.variantColor }"
                    @mouseover="updateProduct(index)"
            ></div>
        </div>

     
        <button
                @click="addToCart"
                :disabled="!inStock"
                :class="{ disabledButton: !inStock }"
        >
            Add to cart
        </button>
        
            <button
                @click="removeToCart"
                :disabled="!inStock"
                :class="{ disabledButton: !inStock }"
        >
            remove to cart
        </button>


<product-tabs :reviews="reviews"></product-tabs>

  
    </div>
 `,
    data() {
        return {
            product: "Socks",
            reviews: [],
            brand: 'Vue Mastery',
            selectedVariant: 0,
            altText: "A pair of socks",
            details: ['80% cotton', '20% polyester', 'Gender-neutral'],
            variants: [
                {
                    variantId: 2234,
                    variantColor: 'green',
                    variantImage: "./assets/vmSocks-green-onWhite.jpg",
                    variantQuantity: 10
                },
                {
                    variantId: 2235,
                    variantColor: 'blue',
                    variantImage: "./assets/vmSocks-blue-onWhite.jpg",
                    variantQuantity: 0
                }
            ],
            cart: 0
        }
    },

    mounted() {
        eventBus.$on('review-submitted', productReview => {
            this.reviews.push(productReview)
        })
    },

    methods: {
        addToCart() {
            this.$emit('add-to-cart', this.variants[this.selectedVariant].variantId);

        },

        removeToCart() {
            this.$emit('remove-to-cart', this.variants[this.selectedVariant].variantId);

        },

        updateProduct(index) {
            this.selectedVariant = index;
            console.log(index);
        },
    },
    computed: {
        title() {
            return this.brand + ' ' + this.product;
        },
        image() {
            return this.variants[this.selectedVariant].variantImage;
        },
        inStock() {
            return this.variants[this.selectedVariant].variantQuantity
        },
        shipping() {
            if (this.premium) {
                return "Free";
            } else {
                return 2.99
            }
        }

    }

})

Vue.component('product-details', {
    data() {
        return {
            details: ['80% cotton', '20% polyester', 'Gender-neutral'],

        }

    },
    template: `
         <ul>
                <li v-for="detail in details">{{ detail }}</li>
            </ul>
        `
    ,
});


Vue.component('product-review', {
    template: `

 
  <form class="review-form" @submit.prevent="onSubmit"> 
  
  <p v-if="errors.length">
 <b>Please correct the following error(s):</b>
 <ul>
   <li v-for="error in errors">{{ error }}</li>
 </ul>
</p>

 <p>
   <label for="name">Name:</label>
   <input id="name" v-model="name" placeholder="name">
 </p>
 <p>
   <label for="name">Would you recommend this product?:</label>
   <input id="name" v-model="radio" type="radio" value="yes" placeholder="no">
   <input id="name" v-model="radio" type="radio" value="no" placeholder="yes">
 </p>

 <p>
   <label for="review">Review:</label>
   <textarea id="review" v-model="review"></textarea>
 </p>

 <p>
   <label for="rating">Rating:</label>
   <select id="rating" v-model.number="rating">
     <option>5</option>
     <option>4</option>
     <option>3</option>
     <option>2</option>
     <option>1</option>
   </select>
 </p>

 <p>
   <input type="submit" value="Submit"> 
 </p>
 
 

 </form>

 `,
    data() {
        return {
            name: null,
            review: null,
            rating: null,
            radio: null,
                errors: []
    }
    },

    methods: {
        onSubmit() {
            if(this.name && this.review && this.rating&& this.radio) {
                let productReview = {
                    name: this.name,
                    review: this.review,
                    rating: this.rating,
                    radio: this.radio,

                }
                eventBus.$emit('review-submitted', productReview)

                this.name = null
                this.review = null
                this.rating = null
                this.radio = null
            } else {
                if(!this.name) this.errors.push("Name required.")
                if(!this.review) this.errors.push("Review required.")
                if(!this.rating) this.errors.push("Rating required.")
                if(!this.radio) this.errors.push("Radio required.")
            }

        }
    }

})

Vue.component('product-tabs', {
    props: {
        reviews: {
            type: Array,
            required: false
        }
    },
    template: `
 <div>   
       <ul>
         <span class="tab"
               :class="{ activeTab: selectedTab === tab }"
               v-for="(tab, index) in tabs"
               @click="selectedTab = tab"
         >{{ tab }}</span>
       </ul>
       <div v-show="selectedTab === 'Reviews'">
         <p v-if="!reviews.length">There are no reviews yet.</p>
         <ul>
           <li v-for="review in reviews">
           <p>{{ review.name }}</p>
           <p>Rating: {{ review.rating }}</p>
           <p>{{ review.review }}</p>
           </li>
         </ul>
       </div>
       <div v-show="selectedTab === 'Make a Review'">
         <product-review></product-review>
       </div>
     </div>

 `,
    data() {
        return {
            tabs: ['Reviews', 'Make a Review'],
            selectedTab: 'Reviews'  // устанавливается с помощью @click
        }
    },

})



let app = new Vue({
    el: '#app',
    data: {
        premium: true,
        cart: []
    },
    methods: {
        updateCart(id) {
            this.cart.push(id);
        },
        removeCart(id) {
            let i = this.cart.indexOf(id);
            this.cart.splice(i, 1);
        }
    }
})