change the data structure returning from route() of Bus.js

controller/Bus.js

@@ -161,13 +161,14 @@ async function afun9025(param) {
 
 async function route(param) {
   if (param.buses.toString() === ['9025A'].toString()) return await afun9025(param);
-  if (![['132'], ['133'], ['132', '133'], ['133', '132'], ['172'], ['173'], ['172', '173'], ['173', '172'], ['5035']].some(valid => valid.join() === param.buses.join())) {
+  param.buses.sort();
+  if (![['132'], ['133'], ['132', '133'], ['172'], ['173'], ['172', '173'], ['5035']].some(valid => valid.join() === param.buses.join())) {
     throw new Error('Invalid Buses: ' + param.buses.join(' '));
   }
 
   const APIBASE = 'https://tdx.transportdata.tw/api/basic/v2/Bus/EstimatedTimeOfArrival/City/Taoyuan';
   const data = {
-    $select: 'StopStatus,EstimateTime,StopName,NextBusTime',
+    $select: 'StopUID,StopStatus,EstimateTime,StopName,NextBusTime',
     $filter: `Direction eq ${param.dir}`,
     $orderby: 'StopSequence',
     $format: 'JSON',
@@ -179,8 +180,6 @@ async function route(param) {
     return url.format(finalUrl);
   };
 
-  console.log(param)
-
   let responses;
   while (true) {
     try {
@@ -194,33 +193,41 @@ async function route(param) {
       await new Promise(resolve => setTimeout(resolve, 500));
     }
   }
-
-  const output = responses[0].data.map((data) => ({
-    stop: data.StopName.Zh_tw,
-    bus: param.buses[0],
-    data: data,
-  }));
-
-  responses.forEach((response, busIndex) => {
-    response.data.forEach((data, dataIndex) => {
-      if (data.NextBusTime) {
-        const currentStop = {
-          stop: data.StopName.Zh_tw,
-          bus: param.buses[busIndex],
-          data: data,
-        };
-        if (data.NextBusTime < output[dataIndex].data.NextBusTime) {
-          output[dataIndex] = currentStop;
-        }
+
+  const output = [];
+  if (param.buses.length == 1) {  // 如果只有選擇一個公車
+    responses[0].data.forEach(stop => {
+      output.push({
+        stop: stop.StopName.Zh_tw,
+        bus: param.buses[0],
+        ...getBusTime(stop),
+      });
+    });
+  } else {  // 如果有兩個公車
+    // 各自的站牌，最後各自加入空字串以計算最後一次的 extra
+    const names = responses.map(response => response.data.map(stop => stop.StopName.Zh_tw)).map(stops => [...stops, '']);
+    const commonNames = names[0].filter(name => names[1].includes(name));    // 共通的站牌
+    const prev = [-1, -1];  // 紀錄上一個共通站排是各自的第幾站，用來計算 skip，因為第一站就是 0，所以初始值設 -1
+    commonNames.forEach(name => {  // 遍歷所有共通站牌
+      const data = responses.map(response => response.data.find(stop => stop.StopName.Zh_tw === name));
+      if (name !== '') {  // 如果代表一般的站牌，而非用來計算最後一次 extra 的空字串
+        // 因為剛好 132 和 172 第一班都比較早，所以判斷如果 133 或 173 有車才比較下一班抵達的時間
+        const earlier = Number(data[1].NextBusTime !== undefined && Date.parse(data[1].NextBusTime) < Date.parse(data[0].NextBusTime));
+        output.push({
+          stop: data[earlier].StopName.Zh_tw,
+          bus: param.buses[earlier],
+          ...getBusTime(data[earlier]),
+        });
       }
+      // 找到此共通站排是各自的第幾站
+      const curr = [names[0].findIndex(element => element === name), names[1].findIndex(element => element === name)];
+      // 計算距離此共通站牌，兩班公車各自獨立的站牌數
+      const extra = param.buses.reduce((acc, bus, index) => ({ ...acc, [bus]: curr[index] - prev[index] - 1 }), {});
+      if (Object.values(extra).some(value => value !== 0)) output.push({ 'extra': extra });  // 如果有公車有非共通站牌
+      prev.splice(0, curr.length, ...curr);  // prev = curr 的寫法
     });
-  });
-
-  return output.map(element => ({
-    stop: element.stop,
-    bus: element.bus,
-    ...getBusTime(element.data),
-  }));
+  }
+  return output;
 }
 
 export default route;