init

.gitignore

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+node_modules
+.vscode

__tests__/index.test.js

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+const openingTimes = require('../index.js')
+
+describe('calculating opening times', () => {
+
+    it('is early morning, waiting in front of the door', () => {
+        const date = new Date(2017, 1, 23, 6, 0, 0, 0)
+        const resultStr = openingTimes(date)
+        expect(resultStr).toBe('öffnet in 01:00')
+    })
+
+    it('is early morning, waiting in front of the door, hoping someone opens early', () => {
+        const date = new Date(2017, 1, 23, 6, 58, 59, 0)
+        const resultStr = openingTimes(date)
+        expect(resultStr).toBe('öffnet in 00:01')
+    })
+
+    it('is sunday...', () => {
+        const date = new Date(2017, 1, 19, 16, 0, 0, 0)
+        const resultStr = openingTimes(date)
+        expect(resultStr).toBe('zur zeit geschlossen, öffnet wieder in 15:00')
+    })
+
+    it('is late night friday', () => {
+        const date = new Date(2017, 1, 18, 23, 30, 0, 0)
+        const resultStr = openingTimes(date)
+        expect(resultStr).toBe('zur zeit geschlossen, öffnet wieder in 31:30')
+    })
+
+    it('should open in 9 h', () => {
+        const date = new Date(2017, 1, 22, 22, 0, 0, 0)
+        const resultStr = openingTimes(date)
+        expect(resultStr).toBe('zur zeit geschlossen, öffnet wieder in 09:00')
+    })
+
+    it('is opened', () => {
+        const date = new Date(2017, 1, 22, 14, 5, 0, 0)
+        const resultStr = openingTimes(date)
+        expect(resultStr).toBe('noch 05:55 geöffnet')
+    })
+
+    it('is still opened, but hurry up', () => {
+        const date = new Date(2017, 1, 22, 19, 59, 55, 0)
+        const resultStr = openingTimes(date)
+        expect(resultStr).toBe('noch 00:00 geöffnet')
+    })
+
+})

index.js

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+const toMilliseconds = hour => {
+    return hour * 60 * 60 * 1000
+}
+
+const leftPad = num => {
+    return num < 10 ? '0' : ''
+}
+
+const msToString = ms => {
+    const minFromMS = ms / 60 / 1000
+    const min = Math.round(minFromMS % 60)
+    const h = Math.floor(minFromMS / 60)
+    return `${leftPad(h)}${h}:${leftPad(min)}${min}`
+}
+
+const resetDate = date => {
+    date.setHours(0)
+    date.setMinutes(0)
+    date.setSeconds(0)
+    date.setMilliseconds(0)
+    return date
+}
+
+// starts with sunday
+const atomicOpeningTimes = [
+    {
+        from: 0,
+        to: 0,
+        nextOpen: toMilliseconds(24) + toMilliseconds(7),
+    },
+    {
+        from: toMilliseconds(7),
+        to: toMilliseconds(20),
+        nextOpen: toMilliseconds(24) + toMilliseconds(7),
+    },
+    {
+        from: toMilliseconds(7),
+        to: toMilliseconds(20),
+        nextOpen: toMilliseconds(24) + toMilliseconds(7),
+    },
+    {
+        from: toMilliseconds(7),
+        to: toMilliseconds(20),
+        nextOpen: toMilliseconds(24) + toMilliseconds(7),
+    },
+    {
+        from: toMilliseconds(7),
+        to: toMilliseconds(20),
+        nextOpen: toMilliseconds(24) + toMilliseconds(7),
+    },
+    {
+        from: toMilliseconds(7),
+        to: toMilliseconds(20),
+        nextOpen: toMilliseconds(24) + toMilliseconds(7),
+    },
+    {
+        from: toMilliseconds(7),
+        to: toMilliseconds(20),
+        nextOpen: toMilliseconds(24) + toMilliseconds(24) + toMilliseconds(7),
+    },
+]
+
+
+const checkOpenningTimes = date => {
+    const nowInMs = date.getTime()
+    const data = atomicOpeningTimes[date.getDay()]
+
+    const morning = resetDate(date)
+    const morningInMS = morning.getTime()
+
+    const diff = nowInMs - morningInMS
+
+    // currently closed, opening same day
+    if (diff < data.from) {
+        return `öffnet in ${msToString(data.from - diff)}`
+    }
+
+    // currently open
+    if (diff > data.from && diff < data.to) {
+        return `noch ${msToString(data.to - diff)} geöffnet`
+    }
+
+    // already closed, opening next time
+    if(diff > data.to){
+        return `zur zeit geschlossen, öffnet wieder in ${msToString(data.nextOpen - diff)}`
+    }
+    
+    return 'wtf...'
+
+}
+
+module.exports = checkOpenningTimes

package.json

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+{
+  "name": "datetest",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "jest"
+  },
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "jest": "^19.0.1"
+  }
+}