const detailsTemplate = `<div>
  <h2>Details</h2>
  <ul>
    <li v-for="detail in details">{{ detail }}</li>
  </ul>
</div>`;

const productTemplate = `<div class="product">
      <div class="product-image">
        <a :href="link">
          <!-- bind the src attribute to the "image" property -->
          <img
            v-bind:src="image"
            :alt="description" :title="description"
          /><!-- :attr is shortcut for v-bind:attr -->
        </a>
      </div>
      <div class="product-info">
        <h1 v-cloak>{{ title }}</h1>

        <h2>Available?</h2>
        <p v-cloak v-show="inStock">In stock</p>
        <p v-cloak v-show="!inStock">Out of stock</p>
        <p>Shipping: {{ shipping }}</p>
        <product-details :details="details"></product-details>
        <h2>Colors</h2>
        <ul>
          <li v-for="(variant, index) in variants"
              v-bind:key="variant.variantId"
              @mouseover="updateImage(index)"
              class="color-box"
              :style="{ backgroundColor: variant.variantColor }"
          /><!-- @ est le raccourci de v-on: -->
        </ul>

        <h2>Sizes</h2>
        <ul>
          <li v-for="size in sizes" :key="size">{{ size }}</li>
        </ul>

        <button v-on:click="addToCart"
                :disabled="!inStock"
                :class="{ disabledButton: !inStock }"
        >Add to cart</button>
        <button v-on:click="removeFromCart">Remove</button>
      </div>

    <product-tabs :reviews="reviews"></product-tabs>
  </div>
`;

const tabsTemplate = `
  <div>
    <span class="tab"
          :class="{ activeTab: selectedTab == tab }"
          v-for="(tab, index) in tabs" :key="index"
          @click="selectedTab = tab">
          {{ tab }}
    </span>

    <div v-show="selectedTab === 'Reviews'">
      <h2>Reviews</h2>
      <p v-if="!reviews.length">There are no reviews yet.</p>
      <ul>
        <li v-for="review in reviews">
          <p>Name: {{ review.name }}</p>
          <p>Rating: {{ review.rating }}</p>
          <p>Recommends: {{ review.recommend }}</p>
          <p>Review: {{ review.review }}</p>
        </li>
      </ul>
    </div>    

    <product-review v-show="selectedTab === 'Make a Review'" ></product-review>
  </div>
`;

let eventBus = new Vue();

Vue.component("product-details", {
  props: {
    details: {
      type: Array,
      required: true,
    },
  },
  template: detailsTemplate,
});

Vue.component("product-review", {
  template: `
    <form class="review-form" @submit.prevent="onSubmit">
      <p v-if="errors.length">
        <b>Please correct the following errror(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">
      </p>
      <p>
        <label for="review">Review:</label>
        <textarea id="review" v-model="review"></textarea>
      </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>Would you recommend this product?</p>
      <div>
        <label for="reco-no">No</label> <input type="radio" v-model="recommend" id="reco-no" value="no">
        <label for="reco-maybe">Maybe</label><input type="radio" v-model="recommend" id="reco-maybe" value="maybe">
        <label for="reco-yes">Yes</label> <input type="radio" v-model="recommend" id="reco-yes" value="yes">
      </div>

      <p>
        <input type="submit" value="Submit">
      </p>
    </form>
  `,
  data() {
    return {
      name: null,
      recommend: null,
      review: null,
      rating: null,
      errors: [],
    }
  },
  methods: {
    onSubmit(evt) {
      this.errors = [];
      if (this.name && this.review && this.rating && this.recommend) {
        const productReview = {
          name: this.name,
          rating: this.rating,
          recommend: this.recommend,
          review: this.review,
        };
        eventBus.$emit("review-submitted", productReview);
        this.name = null;
        this.rating = null;
        this.recommend = null;
        this.review = null;
      } else {
        for (const field of ["name", "rating", "recommend", "review"]) {
          if (!this[field]) {
            this.errors.push(`${field} required`);
          }
        }
      }
    }
  }
});

Vue.component("product-tabs", {
  props: {
    reviews: {
      type: Array,
      required: true,
    }
  },
  template: tabsTemplate,
  data() {
    return {
      selectedTab: "Reviews",
      tabs: ["Reviews", "Make a Review"],
    }
  }
});

Vue.component("product", {
  props: {
    isPremium: {
      type: Boolean,
      required: true,
    }
  },
  template: productTemplate,
  // Computer properties are cached until dependencies change.
  // => cheaper than methods.
  computed: {
    image() {
      const image = this.variants[this.selectedVariant].variantImage;
      return image;
    },
    inStock() {
      return this.variants[this.selectedVariant].variantQuantity > 0;
    },
    shipping() {
      if (this.isPremium) {
        return "Free";
      }
      return "2.99 €";
    },
    title() {
      return [this.brand, this.product].join(' ');
    }
  },
  data() {
    return {
      brand: "Vue Mastery",
      description: "Chaussettes montantes",
      details: [
        "80% cotton",
        "20% polyester",
        "Gender-neutral",
      ],
      inventory: 15,
      link: "https://www.google.com/search?q=vuejs+socks",
      product: "Socks",
      reviews: [],
      selectedVariant: 0,
      sizes: [34, 36, 38, 40, 42, 44, 46],
      variants: [
        {
          variantId: 2234,
          variantColor: "green",
          variantImage: "./assets/img/vmSocks-green-onWhite.jpg",
          variantQuantity: 10,
        },
        {
          variantId: 2235,
          variantColor: "blue",
          variantImage: "./assets/img/vmSocks-blue-onWhite.png",
          variantQuantity: 0,
        },
      ]
    }
  },
  methods: {
    addToCart() {
      this.variants[this.selectedVariant].variantQuantity--;
      this.$emit("add-to-cart", this.variants[this.selectedVariant].variantId);
    },
    removeFromCart() {
      this.variants[this.selectedVariant].variantQuantity++;
      this.$emit("remove-from-cart", this.variants[this.selectedVariant].variantId);
    },
    updateImage(index) {
      this.selectedVariant = index;
    }
  },
  mounted() {
    eventBus.$on('review-submitted', productReview => {
      this.reviews.push(productReview);
    });
  }
});

const app = new Vue({
  el: "#app",
  data: {
    cart: [],
    isPremium: false,
  },
  methods: {
    removeItem(id) {
      console.log("removeItem", id);
      const index = this.cart.indexOf(id);
      if (index > -1) {
        this.cart.splice(index, 1);
      }
    },
    updateCart(id) {
      console.log("updateCart", id);
      this.cart.push(id);
    }
  }
});