From 821fcf09222734ab9665d35baef8d119b85620da Mon Sep 17 00:00:00 2001
From: "D. Berge" <dberge@aaltronav.eu>
Date: Fri, 1 Sep 2023 00:33:13 +0200
Subject: [PATCH] Add wx forecast info to plan (experiment).

Use https://open-meteo.com/ as a weather forecast provider.

This code is intended for demonstration only, not for
production purposes.

(issue #157)


(cherry picked from commit cc4bce13562c8a550835f151cb72a6939070ee9b)
---
 lib/www/client/source/src/views/Plan.vue | 233 ++++++++++++++++++++++-
 1 file changed, 232 insertions(+), 1 deletion(-)

diff --git a/lib/www/client/source/src/views/Plan.vue b/lib/www/client/source/src/views/Plan.vue
index eefa837..60e2e9b 100644
--- a/lib/www/client/source/src/views/Plan.vue
+++ b/lib/www/client/source/src/views/Plan.vue
@@ -119,7 +119,11 @@
         >
 
           <template v-slot:item.srss="{item}">
-            <v-icon small :title="srssInfo(item)">{{srssIcon(item)}}</v-icon>
+            <span style="white-space: nowrap;">
+              <v-icon small :title="srssInfo(item)">{{srssIcon(item)}}</v-icon>
+              /
+              <v-icon small :title="wxInfo(item)" v-if="item.meta.wx">{{wxIcon(item)}}</v-icon>
+            </span>
           </template>
 
           <template v-slot:item.sequence="{item, value}">
@@ -422,6 +426,123 @@ export default {
       plannerConfig: null,
       shiftAll: false, // Shift all sequences checkbox
 
+      // Weather API
+      wxData: null,
+      weathercode: {
+        0: {
+          description: "Clear sky",
+          icon: "mdi-weather-sunny"
+        },
+        1: {
+          description: "Mainly clear",
+          icon: "mdi-weather-sunny"
+        },
+        2: {
+          description: "Partly cloudy",
+          icon: "mdi-weather-partly-cloudy"
+        },
+        3: {
+          description: "Overcast",
+          icon: "mdi-weather-cloudy"
+        },
+        45: {
+          description: "Fog",
+          icon: "mde-weather-fog"
+        },
+        48: {
+          description: "Depositing rime fog",
+          icon: "mdi-weather-fog"
+        },
+        51: {
+          description: "Light drizzle",
+          icon: "mdi-weather-partly-rainy"
+        },
+        53: {
+          description: "Moderate drizzle",
+          icon: "mdi-weather-partly-rainy"
+        },
+        55: {
+          description: "Dense drizzle",
+          icon: "mdi-weather-rainy"
+        },
+        56: {
+          description: "Light freezing drizzle",
+          icon: "mdi-weather-partly-snowy-rainy"
+        },
+        57: {
+          description: "Freezing drizzle",
+          icon: "mdi-weather-partly-snowy-rainy"
+        },
+        61: {
+          description: "Light rain",
+          icon: "mdi-weather-rainy"
+        },
+        63: {
+          description: "Moderate rain",
+          icon: "mdi-weather-rainy"
+        },
+        65: {
+          description: "Heavy rain",
+          icon: "mdi-weather-pouring"
+        },
+        66: {
+          description: "Light freezing rain",
+          icon: "mdi-loading"
+        },
+        67: {
+          description: "Freezing rain",
+          icon: "mdi-loading"
+        },
+        71: {
+          description: "Light snow",
+          icon: "mdi-loading"
+        },
+        73: {
+          description: "Moderate snow",
+          icon: "mdi-loading"
+        },
+        75: {
+          description: "Heavy snow",
+          icon: "mdi-loading"
+        },
+        77: {
+          description: "Snow grains",
+          icon: "mdi-loading"
+        },
+        80: {
+          description: "Light rain showers",
+          icon: "mdi-loading"
+        },
+        81: {
+          description: "Moderate rain showers",
+          icon: "mdi-loading"
+        },
+        82: {
+          description: "Violent rain showers",
+          icon: "mdi-loading"
+        },
+        85: {
+          description: "Light snow showers",
+          icon: "mdi-loading"
+        },
+        86: {
+          description: "Snow showers",
+          icon: "mdi-loading"
+        },
+        95: {
+          description: "Thunderstorm",
+          icon: "mdi-loading"
+        },
+        96: {
+          description: "Hailstorm",
+          icon: "mdi-loading"
+        },
+        99: {
+          description: "Heavy hailstorm",
+          icon: "mdi-loading"
+        },
+      },
+
       // Context menu stuff
       contextMenuShow: false,
       contextMenuX: 0,
@@ -630,6 +751,113 @@ export default {
       return text.join("\n");
     },
 
+    wxInfo (line) {
+
+      function atm(key) {
+        return line.meta?.wx?.atmospheric?.hourly[key];
+      }
+
+      function mar(key) {
+        return line.meta?.wx?.marine?.hourly[key];
+      }
+
+      const code = atm("weathercode");
+
+      const description = this.weathercode[code]?.description ?? `WMO code ${code}`;
+      const wind_speed = Math.round(atm("windspeed_10m"));
+      const wind_direction = String(Math.round(atm("winddirection_10m"))).padStart(3, "0");
+      const pressure = Math.round(atm("surface_pressure"));
+      const temperature = Math.round(atm("temperature_2m"));
+      const humidity = atm("relativehumidity_2m");
+      const precipitation = atm("precipitation");
+      const precipitation_probability = atm("precipitation_probability");
+      const precipitation_str = precipitation_probability
+        ? `\nPrecipitation ${precipitation} mm (prob. ${precipitation_probability}%)`
+        : ""
+
+      const wave_height = mar("wave_height").toFixed(1);
+      const wave_direction = mar("wave_direction");
+      const wave_period = mar("wave_period");
+
+      return `${description}\n${temperature}° C\n${pressure} hPa\nWind ${wind_speed} kt ${wind_direction}°\nRelative humidity ${humidity}%${precipitation_str}\nWaves ${wave_height} m ${wave_direction}° @ ${wave_period} s`;
+    },
+
+    wxIcon (line) {
+      const code = line.meta?.wx?.atmospheric?.hourly?.weathercode;
+
+      return this.weathercode[code]?.icon ?? "mdi-help";
+
+    },
+
+    async wxQuery (line) {
+      function midpoint(line) {
+        // WARNING Fails if across the antimeridian
+        const longitude = (line.geometry.coordinates[0][0] + line.geometry.coordinates[1][0])/2;
+        const latitude = (line.geometry.coordinates[0][1] + line.geometry.coordinates[1][1])/2;
+        return [ longitude, latitude ];
+      }
+
+      function extract (fcst) {
+        const τ = (line.ts0.valueOf() + line.ts1.valueOf()) / 2000;
+        const [idx, ε] = fcst?.hourly?.time?.reduce( (acc, cur, idx) => {
+          const δ = Math.abs(cur - τ);
+          const retval = acc
+            ? acc[1] < δ
+              ? acc
+              : [ idx, δ ]
+            : [ idx, δ ];
+
+          return retval;
+        });
+
+        if (idx) {
+          const hourly = {};
+          for (let key in fcst?.hourly) {
+            fcst.hourly[key] = fcst.hourly[key][idx];
+          }
+        }
+
+        return fcst;
+      }
+
+      async function fetch_atmospheric (opts) {
+        const { longitude, latitude, dt0, dt1 } = opts;
+
+        const url = `https://api.open-meteo.com/v1/forecast?latitude=${latitude}&longitude=${longitude}&hourly=temperature_2m,relativehumidity_2m,precipitation_probability,precipitation,weathercode,pressure_msl,surface_pressure,windspeed_10m,winddirection_10m&daily=uv_index_max&windspeed_unit=kn&timeformat=unixtime&timezone=GMT&start_date=${dt0}&end_date=${dt1}&format=json`;
+        const init = {};
+        const res = await fetch (url, init);
+        if (res?.ok) {
+          const data = await res.json();
+
+          return extract(data);
+        }
+      }
+
+      async function fetch_marine (opts) {
+        const { longitude, latitude, dt0, dt1 } = opts;
+        const url = `https://marine-api.open-meteo.com/v1/marine?latitude=${latitude}&longitude=${longitude}&hourly=wave_height,wave_direction,wave_period&timeformat=unixtime&timezone=GMT&start_date=${dt0}&end_date=${dt1}&format=json`;
+
+        const init = {};
+        const res = await fetch (url, init);
+        if (res?.ok) {
+          const data = await res.json();
+
+          return extract(data);
+        }
+      }
+
+      if (line) {
+        const [ longitude, latitude ] = midpoint(line);
+        const dt0 = line.ts0.toISOString().substr(0, 10);
+        const dt1 = line.ts1.toISOString().substr(0, 10);
+
+        return {
+          atmospheric: await fetch_atmospheric({longitude, latitude, dt0, dt1}),
+          marine: await fetch_marine({longitude, latitude, dt0, dt1})
+        };
+      }
+    },
+
     lagAfter (item) {
       const pos = this.items.indexOf(item)+1;
       if (pos != 0) {
@@ -723,6 +951,9 @@ export default {
       for (const item of this.items) {
         item.ts0 = new Date(item.ts0);
         item.ts1 = new Date(item.ts1);
+        this.wxQuery(item).then( (wx) => {
+          item.meta = {...item.meta, wx};
+        });
       }
     },