<template>
  <div class="grid grid-cols-12 col-span-12">
    <div class="col-span-3 flex flex-col gap-4 lg:gap-6">
      <div class="drop-shadow-md rounded-md border border-zinc-300 p-5">
        <div>
          <label class="block text-sm font-medium text-gray-700" for="heading">Heading</label>
          <input type="text" class="mt-2 block w-full rounded-md border-gray-300 shadow-sm focus:border-indigo-300 focus:ring focus:ring-indigo-200 focus:ring-opacity-50" v-model="heading" id="heading">
          <input type="range" class="mt-1 block w-full rounded-md border-gray-300 shadow-sm focus:border-indigo-300 focus:ring focus:ring-indigo-200 focus:ring-opacity-50" min="1" max="10" step="0.1" v-model="headingSize" id="heading-size">
        </div>

        <div class="py-6">
          <label class="block text-sm font-medium text-gray-700" for="subheading">Subheading</label>
          <textarea class="mt-1 block w-full rounded-md border-gray-300 shadow-sm focus:border-indigo-300 focus:ring focus:ring-indigo-200 focus:ring-opacity-50" v-model="subheading" id="subheading"></textarea>
          <input type="range" class="mt-1 block w-full rounded-md border-gray-300 shadow-sm focus:border-indigo-300 focus:ring focus:ring-indigo-200 focus:ring-opacity-50" min="1" max="10" step="0.1" v-model="subheadingSize" id="subheading-size">
        </div>

        <div class="pb-6">
          <label class="block text-sm font-medium text-gray-700" for="subheading">Font</label>

          <select v-model="font" class="mt-1 block w-full rounded-md border-gray-300 shadow-sm focus:border-indigo-300 focus:ring focus:ring-indigo-200 focus:ring-opacity-50">
            <option v-for="font in fonts" :key="font.value" :value="font.value" v-text="font.label"></option>
          </select>
        </div>

        <div>
          <div class="text-center stroke-gray-400">
            <button v-on:click="headingAlign = 'left'">
              <svg class="inline border-gray-400 rounded-md" :class="{border: headingAlign === 'left'}" height="40" viewBox="0 0 21 21" width="40" xmlns="http://www.w3.org/2000/svg"><g fill="none" fill-rule="evenodd" stroke-linecap="round" stroke-linejoin="round"><path d="m4.5 6.5h12"/><path d="m4.498 10.5h5.997"/><path d="m4.5 14.5h9.995"/></g></svg>
            </button>

            <button v-on:click="headingAlign = 'center'">
              <svg class="inline border-gray-400 rounded-md" :class="{border: headingAlign === 'center'}" height="40" viewBox="0 0 21 21" width="40" xmlns="http://www.w3.org/2000/svg"><g fill="none" fill-rule="evenodd" stroke-linecap="round" stroke-linejoin="round"><path d="m4.5 6.5h12"/><path d="m7.498 10.5h5.997"/><path d="m5.5 14.5h9.995"/></g></svg>
            </button>

            <button v-on:click="headingAlign = 'right'">
              <svg class="inline border-gray-400 rounded-md" :class="{border: headingAlign === 'right'}" height="40" viewBox="0 0 21 21" width="40" xmlns="http://www.w3.org/2000/svg"><g fill="none" fill-rule="evenodd" stroke-linecap="round" stroke-linejoin="round"><path d="m4.5 6.5h12"/><path d="m10.498 10.5h5.997"/><path d="m6.5 14.5h9.995"/></g></svg>
            </button>
          </div>
        </div>
      </div>

      <div class="drop-shadow-md rounded-md border border-zinc-300 p-5">
        <div>
          <label class="block text-sm font-medium text-gray-700" for="author">Author</label>
          <input type="text" class="mt-1 block w-full rounded-md border-gray-300 shadow-sm focus:border-indigo-300 focus:ring focus:ring-indigo-200 focus:ring-opacity-50" v-model="author" id="author">
        </div>

        <div class="py-6">
          <label class="block text-sm font-medium text-gray-700" for="avatar">Avatar</label>
          <input type="file" class="mt-1 block w-full rounded-md border-gray-300 shadow-sm focus:border-indigo-300 focus:ring focus:ring-indigo-200 focus:ring-opacity-50" v-on:change="updateAvatar" id="avatar">
        </div>

        <div>
          <label class="block text-sm font-medium text-gray-700" for="logo">Logo</label>
          <input type="file" class="mt-1 block w-full rounded-md border-gray-300 shadow-sm focus:border-indigo-300 focus:ring focus:ring-indigo-200 focus:ring-opacity-50" v-on:change="updateLogo" id="logo">
        </div>
      </div>
    </div>
    <div class="col-span-3 px-10 flex flex-col gap-4 lg:gap-6">
      <div class="drop-shadow-md rounded-md border border-zinc-300 p-5">
        <div>
          <label class="block text-sm font-medium text-gray-700" for="text-color">Text color</label>
          <input type="color" class="mt-1 block w-full rounded-md border-gray-300 shadow-sm focus:border-indigo-300 focus:ring focus:ring-indigo-200 focus:ring-opacity-50" v-model="textColor" id="text-color">
        </div>

        <div class="py-6">
          <label class="block text-sm font-medium text-gray-700" for="background">Background</label>
          <input type="file" class="mt-1 block w-full rounded-md border-gray-300 shadow-sm focus:border-indigo-300 focus:ring focus:ring-indigo-200 focus:ring-opacity-50" v-on:change="updateBackground" id="background">
        </div>

        <div>
          <label class="block text-sm font-medium text-gray-700" for="background-hover">Background hover</label>
          <input type="color" class="mt-1 block w-full rounded-md border-gray-300 shadow-sm focus:border-indigo-300 focus:ring focus:ring-indigo-200 focus:ring-opacity-50" v-model="backgroundHover" id="background-hover">
          <input type="range" class="mt-1 block w-full rounded-md border-gray-300 shadow-sm focus:border-indigo-300 focus:ring focus:ring-indigo-200 focus:ring-opacity-50" min="0" max="1" step="0.1" v-model="backgroundHoverOpacity" id="background-hover-opacity">
        </div>
      </div>
      <div class="drop-shadow-md rounded-md border border-zinc-300 p-5">
        <div>
          <label class="block text-sm font-medium text-gray-700" for="width">Size and quality</label>

          <div class="grid grid-cols-2 gap-x-4">
            <input type="number" class="mt-1 inline rounded-md border-gray-300 shadow-sm focus:border-indigo-300 focus:ring focus:ring-indigo-200 focus:ring-opacity-50" v-model="width" id="width">
            <input type="number" class="mt-1 inline rounded-md border-gray-300 shadow-sm focus:border-indigo-300 focus:ring focus:ring-indigo-200 focus:ring-opacity-50" v-model="height">
          </div>

          <input type="range" class="mt-1 block w-full rounded-md border-gray-300 shadow-sm focus:border-indigo-300 focus:ring focus:ring-indigo-200 focus:ring-opacity-50" min="0" max="1" step="0.1" v-model="quality">
        </div>

        <div>
          <label class="block text-sm font-medium text-gray-700" for="width">Box padding</label>

          <input type="range" class="mt-1 block w-full rounded-md border-gray-300 shadow-sm focus:border-indigo-300 focus:ring focus:ring-indigo-200 focus:ring-opacity-50" min="2.5" max="10" step="0.1" v-model="contentPadding">
        </div>
      </div>
    </div>
    <div class="col-span-6 space-y-6" ref="ogwrapper">
      <div class="og" ref="og" :style="ogStyle()">
        <div class="og-image" :style="ogImageStyle()">
          <div class="og-image-hover" :style="ogImageHoverStyle()">
            <div class="h-full flex flex-col justify-between" :style="ogContentStyle()">
              <div>
                <h1 class="leading-none" v-text="heading" :style="ogHeadingStyle()"></h1>
                <p class="mt-10 mb-16 leading-tight" v-text="subheading" :style="ogSubheadingStyle()"></p>
              </div>

              <div class="w-full flex flex-row items-center og-image--footer">
                <img class="mr-4 h-10 w-10 rounded-full" v-if="avatar" :src="avatar">

                <span class="mr-auto" v-text="author"></span>

                <img v-if="logo" class="mr-4 h-10 w-10 rounded-full" :src="logo">
              </div>
            </div>
          </div>
        </div>
      </div>

      <div class="rounded-md text-center" role="group">
        <button type="button" class="px-4 py-2 text-sm font-medium text-gray-900 bg-white border border-gray-200 rounded-l-lg hover:bg-gray-100 hover:text-blue-700 focus:z-10 focus:ring-2 focus:ring-blue-700 focus:text-blue-700 dark:bg-gray-700 dark:border-gray-600 dark:text-white dark:hover:text-white dark:hover:bg-gray-600 dark:focus:ring-blue-500 dark:focus:text-white" v-on:click="downloadAsPng">
          PNG
        </button>
        <button type="button" class="px-4 py-2 text-sm font-medium text-gray-900 bg-white border border-gray-200 rounded-r-md hover:bg-gray-100 hover:text-blue-700 focus:z-10 focus:ring-2 focus:ring-blue-700 focus:text-blue-700 dark:bg-gray-700 dark:border-gray-600 dark:text-white dark:hover:text-white dark:hover:bg-gray-600 dark:focus:ring-blue-500 dark:focus:text-white" v-on:click="downloadAsJpeg">
          JPEG
        </button>
      </div>
    </div>
  </div>
</template>

<style>
.og {
  background: #cecece;
  max-width: 10px;
  margin: auto;
}

.og-heading {
  font-size: 5em;
}

.og-subheading {
  font-size: 3em;
}

.og-image--footer {
  font-size: 1.3em;
}
</style>

<script>
import { hexToRgb } from '../util/color'
import { toBase64 } from '../util/file'
import { toPng, toJpeg } from 'html-to-image'

export default {
  data() {
    return {
      author: localStorage.getItem('author'),
      heading: localStorage.getItem('heading'),
      subheading: localStorage.getItem('subheading'),
      headingAlign: localStorage.getItem('headingAlign') ?? 'left',
      font: localStorage.getItem('font') ?? 'Trebuchet MS',
      avatar: localStorage.getItem('avatar'),
      logo: localStorage.getItem('logo'),
      textColor: localStorage.getItem('textColor') ?? '#333333',
      background: localStorage.getItem('background'),
      backgroundHover: localStorage.getItem('backgroundHover') ?? '#000000',
      backgroundHoverOpacity: localStorage.getItem('backgroundHoverOpacity') ?? 0,
      headingSize: localStorage.getItem('headingSize') ?? 4,
      subheadingSize: localStorage.getItem('subheadingSize') ?? 2,
      width: localStorage.getItem('width') ?? 1920,
      height: localStorage.getItem('height') ?? 1080,
      quality: localStorage.getItem('quality') ?? 0.9,
      contentPadding: localStorage.getItem('contentPadding') ?? 2.5,
      ogMaxWidth: 100,

      fonts: [
        {label: 'Arial (sans-serif)', value : 'Arial'},
        {label: 'Brush Script MT (cursive)', value : 'Brush Script MT'},
        {label: 'Calibri (sans-serif)', value : 'Calibri'},
        {label: 'Courier New (monospace)', value : 'Courier New'},
        {label: 'Garamond (serif)', value : 'Garamond'},
        {label: 'Georgia (serif)', value : 'Georgia'},
        {label: 'Tahoma (sans-serif)', value : 'Tahoma'},
        {label: 'Times New Roman (serif)', value : 'Times New Roman'},
        {label: 'Trebuchet MS (sans-serif)', value : 'Trebuchet MS'},
        {label: 'Verdana (sans-serif)', value : 'Verdana'},
      ],
    }
  },
  methods: {
    ogStyle() {
      return {
        color: this.textColor,
        width: `${this.width}px`,
        maxWidth: `${this.ogMaxWidth}px`,
        fontFamily: this.font,
      }
    },
    ogImageStyle() {
      if (this.background) {
        return {
          background: `url(${this.background}) center`,
          backgroundSize: 'cover',
        }
      }
    },
    ogHeadingStyle() {
      return {
        fontSize: `${this.headingSize}em`,
        textAlign: this.headingAlign,
      }
    },
    ogSubheadingStyle() {
      return {
        fontSize: `${this.subheadingSize}em`,
        textAlign: this.headingAlign,
      }
    },
    ogImageHoverStyle() {
      let background = 'none'

      if (this.backgroundHover) {
        const colors = hexToRgb(this.backgroundHover)
        background = `rgba(${colors.red}, ${colors.green}, ${colors.blue}, ${this.backgroundHoverOpacity})`
      }

      return {
        background,
        aspectRatio: `${this.width}/${this.height}`
      }
    },
    ogContentStyle() {
      return {
        padding: `${this.contentPadding}em`,
      }
    },
    async updateBackground(event) {
      this.background = await this.convertFileToBase64(event.target.files)
    },
    async updateLogo(event) {
      this.logo = await this.convertFileToBase64(event.target.files)
    },
    async updateAvatar(event) {
      this.avatar = await this.convertFileToBase64(event.target.files)
    },
    downloadAsPng() {
      return this.download(toPng, 'image.png')
    },
    downloadAsJpeg() {
      return this.download(toJpeg, 'image.jpg')
    },
    download(callback, filename) {
      const element = this.$refs.og

      callback(this.$refs.og, {
        canvasWidth: this.width,
        canvasHeight: this.height,
        quality: this.quality,
      })
        .then((dataUrl) => {
          const link = document.createElement('a')

          link.setAttribute('href', dataUrl)
          link.setAttribute('download', filename)
          link.click()
        })
        .catch((error) => {
          element.classList.toggle('og--scale', false)

          console.error('oops, something went wrong!', error);
        })
    },
    async convertFileToBase64(files) {
      if (files.length) {
        return await toBase64(files[0])
      }

      return null
    },
    updateOgMaxWidth() {
      this.$refs.og.style.display = 'none'
      this.ogMaxWidth = this.$refs.ogwrapper.offsetWidth
      this.$refs.og.style.display = 'block'
    },
  },
  watch: {
    author(value) {
      localStorage.setItem('author', value)
    },
    heading(value) {
      localStorage.setItem('heading', value)
    },
    subheading(value) {
      localStorage.setItem('subheading', value)
    },
    avatar(value) {
      localStorage.setItem('avatar', value)
    },
    logo(value) {
      localStorage.setItem('logo', value)
    },
    textColor(value) {
      localStorage.setItem('textColor', value)
    },
    background(value) {
      localStorage.setItem('background', value)
    },
    backgroundHover(value) {
      localStorage.setItem('backgroundHover', value)
    },
    backgroundHoverOpacity(value) {
      localStorage.setItem('backgroundHoverOpacity', value)
    },
    headingSize(value) {
      localStorage.setItem('headingSize', value)
    },
    subheadingSize(value) {
      localStorage.setItem('subheadingSize', value)
    },
    headingAlign(value) {
      localStorage.setItem('headingAlign', value)
    },
    width(value) {
      localStorage.setItem('width', value)
    },
    height(value) {
      localStorage.setItem('height', value)
    },
    quality(value) {
      localStorage.setItem('quality', value)
    },
    contentPadding(value) {
      localStorage.setItem('contentPadding', value)
    },
    font(value) {
      localStorage.setItem('font', value)
    },
  },
  mounted() {
    this.updateOgMaxWidth()
    window.addEventListener('resize', this.updateOgMaxWidth, false)
  }
}
</script>
