Fix light rail ETA (route_list=null; end_service_status)

src/lightRail.ts

@@ -21,61 +21,83 @@ export default function fetchEtas({
     },
   )
     .then((response) => response.json())
-    .then(({ platform_list }) =>
-      platform_list.reduce(
-        (acc: Eta[], { route_list, platform_id }: any) => [
-          ...acc,
-          ...route_list
-            .filter(
-              ({ route_no, dest_ch, dest_en, stop }: any) =>
-                route === route_no &&
-                (dest_ch === dest.zh || dest_en.includes("Circular")) &&
-                stop === 0,
-            )
-            .map(({ time_en, train_length }: any) => {
-              let waitTime = 0;
-              switch (time_en.toLowerCase()) {
-                case "arriving":
-                case "departing":
-                case "-":
-                  waitTime = 0;
-                  break;
-                default:
-                  waitTime = parseInt(time_en, 10);
-                  break;
-              }
-              const etaDate = new Date(
-                Date.now() + waitTime * 60 * 1000 + 8 * 3600000,
-              );
-              return {
-                eta:
-                  `${etaDate.getUTCFullYear()}-${`0${
-                    etaDate.getUTCMonth() + 1
-                  }`.slice(-2)}-${`0${etaDate.getUTCDate()}`.slice(-2)}` +
-                  `T${`0${etaDate.getUTCHours()}`.slice(
-                    -2,
-                  )}:${`0${etaDate.getMinutes()}`.slice(
-                    -2,
-                  )}:${`0${etaDate.getSeconds()}`.slice(-2)}+08:00`,
-                remark: {
-                  zh: `${platform_id}號月台 - ${Array(train_length)
-                    .fill("▭")
-                    .join("")}`,
-                  en: `Platform ${platform_id} - ${Array(train_length)
-                    .fill("▭")
-                    .join("")}`,
-                },
-                dest: {
-                  zh: "",
-                  en: "",
-                },
-                co: "lightRail",
-              };
-            }, []),
-        ],
-        [],
-      ),
-    )
+    .then(({ platform_list }) => {
+      if (
+        platform_list.every(({ end_service_status }: any) => end_service_status)
+      ) {
+        return [
+          {
+            eta: null,
+            remark: {
+              zh: "此站今日服務已經終止",
+              en: "This stop's service for today has ended",
+            },
+            dest: {
+              zh: "",
+              en: "",
+            },
+            co: "lightRail",
+          },
+        ];
+      }
+      // How should `end_service_status` for only some platforms be handled? Would a light rail line stop at different platforms?
+      return platform_list.reduce(
+        (acc: Eta[], { route_list, platform_id }: any) => {
+          return [
+            ...acc,
+            // route_list is null when there are no ETAs available
+            ...(route_list ?? [])
+              .filter(
+                ({ route_no, dest_ch, dest_en, stop }: any) =>
+                  route === route_no &&
+                  (dest_ch === dest.zh || dest_en.includes("Circular")) &&
+                  stop === 0,
+              )
+              .map(({ time_en, train_length }: any) => {
+                let waitTime = 0;
+                switch (time_en.toLowerCase()) {
+                  case "arriving":
+                  case "departing":
+                  case "-":
+                    waitTime = 0;
+                    break;
+                  default:
+                    waitTime = parseInt(time_en, 10);
+                    break;
+                }
+                const etaDate = new Date(
+                  Date.now() + waitTime * 60 * 1000 + 8 * 3600000,
+                );
+                return {
+                  eta:
+                    `${etaDate.getUTCFullYear()}-${`0${
+                      etaDate.getUTCMonth() + 1
+                    }`.slice(-2)}-${`0${etaDate.getUTCDate()}`.slice(-2)}` +
+                    `T${`0${etaDate.getUTCHours()}`.slice(
+                      -2,
+                    )}:${`0${etaDate.getMinutes()}`.slice(
+                      -2,
+                    )}:${`0${etaDate.getSeconds()}`.slice(-2)}+08:00`,
+                  remark: {
+                    zh: `${platform_id}號月台 - ${Array(train_length)
+                      .fill("▭")
+                      .join("")}`,
+                    en: `Platform ${platform_id} - ${Array(train_length)
+                      .fill("▭")
+                      .join("")}`,
+                  },
+                  dest: {
+                    zh: "",
+                    en: "",
+                  },
+                  co: "lightRail",
+                };
+              }, []),
+          ];
+        },
+        []
+      );
+    })
     .catch((e) => {
       console.error(e);
       return [];