From f79d01ad9bea104b27cae12222888e6ebfe0fef1 Mon Sep 17 00:00:00 2001
From: Jake Dexheimer <jakedex@gmail.com>
Date: Wed, 7 Mar 2018 20:22:47 -0600
Subject: [PATCH] Add RandomImage component

---
 components/ExportSizeSelect.js |  2 +-
 components/ImagePicker.js      | 43 ++++++++++++----
 components/RandomImage.js      | 93 ++++++++++++++++++++++++++++++++++
 lib/util.js                    | 10 ++++
 4 files changed, 137 insertions(+), 11 deletions(-)
 create mode 100644 components/RandomImage.js

diff --git a/components/ExportSizeSelect.js b/components/ExportSizeSelect.js
index e881fd3..db862ff 100644
--- a/components/ExportSizeSelect.js
+++ b/components/ExportSizeSelect.js
@@ -59,7 +59,7 @@ export default class extends React.Component {
           onClick={this.toggle}
           className={`display ${this.state.isVisible ? 'is-visible' : ''}`}
         >
-          <span className="label">Export Size</span>
+          <span className="label">Export size</span>
           <span style={{ exportSize: selectedExportSize.id }}>{selectedExportSize.name}</span>
         </div>
         <div className="list">{this.renderExportSizes()}</div>
diff --git a/components/ImagePicker.js b/components/ImagePicker.js
index 0f14899..d3216da 100644
--- a/components/ImagePicker.js
+++ b/components/ImagePicker.js
@@ -1,7 +1,10 @@
 import React from 'react'
 import ReactCrop, { makeAspectCrop } from 'react-image-crop'
+
 import Slider from './Slider'
+import RandomImage from './RandomImage'
 import { COLORS } from '../lib/constants'
+import { fileToDataURL } from '../lib/util'
 
 const getCroppedImg = (imageDataURL, pixelCrop) => {
   const canvas = document.createElement('canvas')
@@ -59,18 +62,16 @@ export default class extends React.Component {
   }
 
   selectImage(e) {
-    const file = e.target.files[0]
+    const file = e.target ? e.target.files[0] : e
 
-    const reader = new FileReader()
-    reader.onload = e =>
-      this.props.onChange({ backgroundImage: e.target.result, backgroundImageSelection: null })
-    reader.readAsDataURL(file)
+    return fileToDataURL(file).then(dataURL =>
+      this.props.onChange({ backgroundImage: dataURL, backgroundImageSelection: null })
+    )
   }
 
   removeImage() {
     this.setState(INITIAL_STATE, () => {
       this.props.onChange({
-        backgroundMode: 'color',
         backgroundImage: null,
         backgroundImageSelection: null
       })
@@ -108,18 +109,40 @@ export default class extends React.Component {
 
   render() {
     let content = (
-      <div className="upload-image">
-        <span>Click the button below to upload a background image</span>
-        <input type="file" accept="image/x-png,image/jpeg,image/jpg" onChange={this.selectImage} />
+      <div>
+        <div className="choose-image">
+          <span>Click the button below to upload a background image:</span>
+          <input
+            type="file"
+            accept="image/x-png,image/jpeg,image/jpg"
+            onChange={this.selectImage}
+          />
+        </div>
+        <hr />
+        <div className="random-image">
+          <span>Or use a random unsplash image:</span>
+          <RandomImage onChange={this.selectImage} />
+        </div>
         <style jsx>{`
-          .upload-image {
+          .choose-image,
+          .random-image {
             padding: 8px;
           }
 
+          input {
+            cursor: pointer;
+            outline: none;
+          }
+
           span {
             display: block;
             margin-bottom: 16px;
           }
+
+          hr {
+            border-bottom: none;
+            margin-bottom: 0;
+          }
         `}</style>
       </div>
     )
diff --git a/components/RandomImage.js b/components/RandomImage.js
new file mode 100644
index 0000000..1fc980a
--- /dev/null
+++ b/components/RandomImage.js
@@ -0,0 +1,93 @@
+import React from 'react'
+import axios from 'axios'
+
+import { range, fileToDataURL } from '../lib/util'
+
+const RAND_RANGE = 1000000
+const UPDATE_SIZE = 10
+const WALLPAPER_COLLECTION_ID = 1065396
+const RANDOM_WALLPAPER_URL = `https://source.unsplash.com/collection/${WALLPAPER_COLLECTION_ID}/240x320`
+
+const largerImage = url => url.replace(/w=\d+/, 'w=1920').replace(/&h=\d+/, '')
+const smallerImage = url => url.replace(/w=\d+/, 'w=240')
+
+async function getImage() {
+  // circumvent browser caching
+  const sig = Math.floor(Math.random() * RAND_RANGE)
+
+  const res = await axios.get(`${RANDOM_WALLPAPER_URL}?sig=${sig}`, { responseType: 'blob' })
+  return {
+    url: res.request.responseURL,
+    dataURL: await fileToDataURL(res.data)
+  }
+}
+
+export default class extends React.Component {
+  constructor() {
+    super()
+    this.state = { cache: [] }
+    this.selectImage = this.selectImage.bind(this)
+    this.updateCache = this.updateCache.bind(this)
+    this.nextImage = this.nextImage.bind(this)
+  }
+
+  // update in browser (we require window.FileReader)
+  componentDidMount() {
+    this.updateCache()
+  }
+
+  selectImage() {
+    axios
+      .get(largerImage(this.state.cache[0].url), { responseType: 'blob' })
+      .then(res => res.data)
+      .then(this.props.onChange)
+  }
+
+  updateCache() {
+    Promise.all(range(UPDATE_SIZE).map(getImage)).then(imgs =>
+      this.setState({ cache: this.state.cache.concat(imgs) })
+    )
+  }
+
+  nextImage() {
+    this.setState({ cache: this.state.cache.slice(1) })
+
+    if (this.state.cache.length < 3) {
+      this.updateCache()
+    }
+  }
+
+  render() {
+    const bgImage = this.state.cache[0] && this.state.cache[0].dataURL
+
+    return (
+      <div className="random-image-container">
+        <div className="controls">
+          <span onClick={this.selectImage}>Use Image</span>
+          <span onClick={this.nextImage}>Try Another</span>
+        </div>
+        <div className="image" />
+        <style jsx>{`
+          .image {
+            width: 100%;
+            height: 120px;
+            background: url(${bgImage});
+            background-size: cover;
+            background-repeat: no-repeat;
+          }
+
+          .controls {
+            display: flex;
+            justify-content: space-between;
+            margin-bottom: 4px;
+          }
+
+          span {
+            cursor: pointer;
+            user-select: none;
+          }
+        `}</style>
+      </div>
+    )
+  }
+}
diff --git a/lib/util.js b/lib/util.js
index 27f4060..42a9b18 100644
--- a/lib/util.js
+++ b/lib/util.js
@@ -24,3 +24,13 @@ export const getState = morph.compose(parse, escapeHtml, morph.get(KEY))
 export const saveState = (window, v) => assign(window, JSON.stringify(v))
 
 export const capitalizeFirstLetter = s => s.charAt(0).toUpperCase() + s.slice(1)
+
+export const range = n => [...Array(n).keys()]
+
+export const fileToDataURL = blob => {
+  return new Promise(res => {
+    const reader = new FileReader()
+    reader.onload = e => res(e.target.result)
+    reader.readAsDataURL(blob)
+  })
+}