Add basic support for active weather alerts

yikes nobody should stake their life on how well this works, but it
does seem to basically work..

src/router/index.js

@@ -1,6 +1,7 @@
 import { createRouter, createWebHistory } from 'vue-router'
 import HomeView from '../views/HomeView.vue'
 import WeatherView from '../views/WeatherView.vue'
+import AlertsView from '../views/AlertsView.vue'
 import HourlyView from '../views/HourlyView.vue'
 import EditListView from '../views/EditListView.vue'
 
@@ -17,6 +18,11 @@ const router = createRouter({
         name: 'weather',
         component: WeatherView,
     },
+    {
+        path: '/alerts',
+        name: 'alerts',
+        component: AlertsView,
+    },
     {
         path: '/hourly',
         name: 'hourly',

src/stores/weather.js

@@ -10,6 +10,7 @@ const getDefaults = () => {
         coordinates,
         cityState,
         weather: null,
+        alerts: null,
         forecast: null,
         radarLatestURL: null,
         radarLoopURL: null,
@@ -32,14 +33,17 @@ export const useWeatherStore = defineStore('weather', {
             this.setForecast(null)
             this.radarLatestURL = null
             this.radarLoopURL = null
+            this.alerts = null
         },
 
         async getWeather() {
 
             if (!this.weather) {
+                let url
+                let response
 
-                const url = `https://api.weather.gov/points/${this.coordinates}`
+                url = `https://api.weather.gov/points/${this.coordinates}`
-                const response = await fetch(url)
+                response = await fetch(url)
                 const weather = await response.json()
                 if (weather.status == 404) {
                     throw new Error(`Data not found for ${this.coordinates}`)
@@ -57,6 +61,65 @@ export const useWeatherStore = defineStore('weather', {
                 this.radarLoopURL = `https://radar.weather.gov/ridge/standard/${station}_loop.gif`
 
                 this.setWeather(weather)
+
+                // fetch zone to get its official id
+                url = weather.properties.forecastZone
+                response = await fetch(url)
+                const zone = await response.json()
+
+                // fetch alerts for zone
+                url = `https://api.weather.gov/alerts/active/zone/${zone.properties.id}`
+                response = await fetch(url)
+                const zoneAlerts = await response.json()
+
+                // fetch county to get its official id
+                url = weather.properties.county
+                response = await fetch(url)
+                const county = await response.json()
+
+                // fetch alerts for county
+                url = `https://api.weather.gov/alerts/active/zone/${county.properties.id}`
+                response = await fetch(url)
+                const countyAlerts = await response.json()
+
+                const newAlerts = {}
+
+                // use latest timestamp from either zone or county
+                newAlerts.updated = zoneAlerts.updated
+                if (countyAlerts.updated > zoneAlerts.updated) {
+                    newAlerts.updated = countyAlerts.updated
+                }
+
+                // collect all alert "features" but de-duplicate them
+                newAlerts.features = {}
+                for (let feature of zoneAlerts.features) {
+                    newAlerts.features[feature.properties.id] = feature
+                }
+                for (let feature of countyAlerts.features) {
+                    newAlerts.features[feature.properties.id] = feature
+                }
+                newAlerts.features = Object.values(newAlerts.features)
+
+                // put "likely" before "possible" alerts
+                newAlerts.features.sort((a, b) => {
+
+                    if (a.properties.certainty == 'Likely' && b.properties.certainty == 'Possible') {
+                        return -1
+                    }
+                    if (a.properties.certainty == 'Possible' && b.properties.certainty == 'Likely') {
+                        return 1
+                    }
+
+                    // if (a.properties.certainty == b.properties.certainty) {
+                    //     return 0
+                    // }
+
+                    // TODO: what else should this do?
+                    return 0
+                })
+
+                // we have our final alerts
+                this.alerts = newAlerts
             }
 
             return this.weather

src/views/AlertsView.vue

@@ -0,0 +1,51 @@
+<script setup>
+import { mapStores } from 'pinia'
+import { useWeatherStore } from '../stores/weather'
+</script>
+
+<script>
+export default {
+
+    computed: {
+        ...mapStores(useWeatherStore),
+    },
+
+    activated() {
+        this.weatherStore.getWeather()
+    },
+}
+</script>
+
+<template>
+  <main>
+
+    <o-button variant="primary"
+              size="small"
+              icon-left="arrow-left"
+              @click="$router.push('/weather')">
+      Back
+    </o-button>
+
+    <h5 class="is-size-5">{{ weatherStore.cityState }}</h5>
+    <h5 class="is-size-5">Alerts</h5>
+    <br />
+
+    <o-collapse v-for="feature in weatherStore.alerts?.features || []"
+                variant="warning"
+                :open="false">
+      <template #trigger>
+        <o-notification :variant="feature.properties.certainty == 'Likely' ? 'danger' : 'warning'"
+                        icon="plus"
+                        icon-size="small"
+                        style="cursor: pointer;">
+          {{ feature.properties.event }} ({{ feature.properties.severity }}, {{ feature.properties.certainty }})
+        </o-notification>
+      </template>
+      <div class="notification">
+        <h5 class="is-size-5 block">{{ feature.properties.headline }}</h5>
+        <p class="block" style="white-space: pre-wrap;">{{ feature.properties.description }}</p>
+      </div>
+    </o-collapse>
+
+  </main>
+</template>

src/views/WeatherView.vue

@@ -10,6 +10,7 @@ export default {
     data() {
         return {
             coordinates: null,
+            alerts: null,
         }
     },
 
@@ -48,6 +49,7 @@ export default {
 
             const forecast = await this.weatherStore.getForecast()
             this.coordinates = this.weatherStore.coordinates
+            this.alerts = this.weatherStore.alerts
         },
 
         getShortForecast(period) {
@@ -77,6 +79,16 @@ export default {
         </o-select>
       </o-field>
 
+      <div v-if="alerts?.features?.length">
+        <o-notification variant="warning"
+                        icon="warning"
+                        @click="$router.push('/alerts')"
+                        style="cursor: pointer;">
+          <p class="has-text-weight-bold">Watches In Effect</p>
+          <p>Updated {{ new Date(alerts.updated).toLocaleTimeString('en-US', {timeStyle: 'short'}) }}</p>
+        </o-notification>
+      </div>
+
       <nav class="panel weather-panel">
 
         <p class="panel-heading">