Added segmentShift

See #151

src/routes/postSegmentShift.js

@@ -0,0 +1,101 @@
+const db = require('../databases/databases.js').db;
+const getHash = require('../utils/getHash.js');
+const isUserVIP = require('../utils/isUserVIP.js');
+const logger = require('../utils/logger.js');
+
+const ACTION_NONE = Symbol('none');
+const ACTION_UPDATE = Symbol('update');
+const ACTION_REMOVE = Symbol('remove');
+
+function shiftSegment(segment, shift) {
+  if (segment.startTime >= segment.endTime) return {action: ACTION_NONE, segment};
+  if (shift.startTime >= shift.endTime) return {action: ACTION_NONE, segment};
+  const duration = shift.endTime - shift.startTime;
+  if (shift.endTime < segment.startTime) {
+    // Scenario #1 cut before segment
+    segment.startTime -= duration;
+    segment.endTime -= duration;
+    return {action: ACTION_UPDATE, segment};
+  }
+  if (shift.startTime > segment.endTime) {
+    // Scenario #2 cut after segment
+    return {action: ACTION_NONE, segment};
+  }
+  if (segment.startTime < shift.startTime && segment.endTime > shift.endTime) {
+    // Scenario #3 cut inside segment
+    segment.endTime -= duration;
+    return {action: ACTION_UPDATE, segment};
+  }
+  if (segment.startTime >= shift.startTime && segment.endTime > shift.endTime) {
+    // Scenario #4 cut overlap startTime
+    segment.startTime = shift.startTime;
+    segment.endTime -= duration;
+    return {action: ACTION_UPDATE, segment};
+  }
+  if (segment.startTime < shift.startTime && segment.endTime <= shift.endTime) {
+    // Scenario #5 cut overlap endTime
+    segment.endTime = shift.startTime;
+    return {action: ACTION_UPDATE, segment};
+  }
+  if (segment.startTime >= shift.startTime && segment.endTime <= shift.endTime) {
+    // Scenario #6 cut overlap startTime and endTime
+    return {action: ACTION_REMOVE, segment};
+  }
+  return {action: ACTION_NONE, segment};
+}
+
+module.exports = (req, res) => {
+  // Collect user input data
+  const videoID = req.body.videoID;
+  const startTime = req.body.startTime;
+  const endTime = req.body.endTime;
+  let userID = req.body.userID;
+
+  // Check input data is valid
+  if (!videoID
+    || !userID
+    || !startTime
+    || !endTime
+  ) {
+    res.status(400).json({
+      message: 'Bad Format'
+    });
+    return;
+  }
+
+  // Check if user is VIP
+  userID = getHash(userID);
+  const userIsVIP = isUserVIP(userID);
+
+  if (!userIsVIP) {
+    res.status(403).json({
+      message: 'Must be a VIP to perform this action.'
+    });
+    return;
+  }
+  
+  try {
+    const segments = db.prepare('all', 'SELECT startTime, endTime, UUID FROM sponsorTimes WHERE videoID = ?', [videoID]);
+    const shift = {
+      startTime,
+      endTime,
+    };
+    segments.forEach(segment => {
+      const result = shiftSegment(segment, shift);
+        switch (result.action) {
+          case ACTION_UPDATE:
+            db.prepare('run', 'UPDATE sponsorTimes SET startTime = ?, endTime = ? WHERE UUID = ?', [result.segment.startTime, result.segment.endTime, result.segment.UUID]);
+          break;
+          case ACTION_REMOVE:
+            db.prepare('run', 'UPDATE sponsorTimes SET startTime = ?, endTime = ?, votes = -2 WHERE UUID = ?', [result.segment.startTime, result.segment.endTime, result.segment.UUID]);
+          break;
+        }
+    });
+  }
+  catch(err) {
+    logger.error(err);
+    res.sendStatus(500);
+  }
+  
+  res.sendStatus(200);
+};