From 40a20f94c10353560b78103c6394b0845c8e91c8 Mon Sep 17 00:00:00 2001
From: Dragory <dragory.up@gmail.com>
Date: Sat, 24 Nov 2018 19:14:12 +0200
Subject: [PATCH] ModActions: fix errors when listing too many cases

---
 src/plugins/ModActions.ts | 18 ++++++++++++++----
 src/plugins/Utility.ts    |  8 +++++---
 src/utils.ts              | 40 +++++++++++++++++++++++++++++++++++++++
 3 files changed, 59 insertions(+), 7 deletions(-)

diff --git a/src/plugins/ModActions.ts b/src/plugins/ModActions.ts
index 9e969e1f..f404c31b 100644
--- a/src/plugins/ModActions.ts
+++ b/src/plugins/ModActions.ts
@@ -5,6 +5,8 @@ import humanizeDuration from "humanize-duration";
 import chunk from "lodash.chunk";
 import { GuildCases } from "../data/GuildCases";
 import {
+  chunkLines,
+  chunkMessageLines,
   convertDelayStringToMS,
   DBDateFormat,
   disableLinkPreviews,
@@ -862,6 +864,11 @@ export class ModActionsPlugin extends Plugin {
       msg.channel.createMessage("No cases found for the specified user!");
     } else {
       if (args.expanded && args.expanded.startsWith("expand")) {
+        if (cases.length > 8) {
+          msg.channel.createMessage("Too many cases for expanded view. Please use compact view instead.");
+          return;
+        }
+
         // Expanded view (= individual case embeds)
         for (const theCase of cases) {
           await this.displayCase(theCase.id, msg.channel.id);
@@ -889,13 +896,16 @@ export class ModActionsPlugin extends Plugin {
 
         const finalMessage = trimLines(`
         Cases for **${userName}**:
-        
+
         ${lines.join("\n")}
-        
-        Use \`${prefix}case <num>\` to see more info about individual cases        
+
+        Use \`${prefix}case <num>\` to see more info about individual cases
       `);
 
-        msg.channel.createMessage(finalMessage);
+        const finalMessageChunks = chunkMessageLines(finalMessage);
+        for (const msgChunk of finalMessageChunks) {
+          msg.channel.createMessage(msgChunk);
+        }
       }
     }
   }
diff --git a/src/plugins/Utility.ts b/src/plugins/Utility.ts
index 41345201..5c8bae6d 100644
--- a/src/plugins/Utility.ts
+++ b/src/plugins/Utility.ts
@@ -259,18 +259,20 @@ export class UtilityPlugin extends Plugin {
     const cases = await this.cases.getByUserId(args.userId);
     if (cases.length > 0) {
       cases.sort((a, b) => {
-        return a.created_at < b.created_at ? -1 : 1;
+        return a.created_at < b.created_at ? 1 : -1;
       });
 
-      const caseSummaries = cases.map(c => {
+      const caseSummary = cases.slice(0, 3).map(c => {
         return `${CaseTypes[c.type]} (#${c.case_number})`;
       });
 
+      const summaryText = cases.length > 3 ? "Last 3 cases" : "Summary";
+
       embed.fields.push({
         name: "Cases",
         value: trimLines(`
           Total cases: ${cases.length}
-          Summary: ${caseSummaries.join(", ")}
+          ${summaryText}: ${caseSummary.join(", ")}
         `)
       });
     }
diff --git a/src/utils.ts b/src/utils.ts
index 04dbae25..b874aaf7 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -229,4 +229,44 @@ export function disableCodeBlocks(content: string): string {
   return content.replace(/`/g, "`\u200b");
 }
 
+export function chunkLines(str: string, maxChunkLength = 2000): string[] {
+  if (str.length < maxChunkLength) {
+    return [str];
+  }
+
+  const chunks = [];
+
+  while (str.length) {
+    if (str.length <= maxChunkLength) {
+      chunks.push(str);
+      break;
+    }
+
+    const slice = str.slice(0, maxChunkLength);
+
+    const lastLineBreakIndex = slice.lastIndexOf("\n");
+    if (lastLineBreakIndex === -1) {
+      chunks.push(str.slice(0, maxChunkLength));
+      str = str.slice(maxChunkLength);
+    } else {
+      chunks.push(str.slice(0, lastLineBreakIndex));
+      str = str.slice(lastLineBreakIndex + 1);
+    }
+  }
+
+  return chunks;
+}
+
+/**
+ * Chunks a long message to multiple smaller messages, retaining leading and trailing line breaks
+ */
+export function chunkMessageLines(str: string): string[] {
+  const chunks = chunkLines(str, 1999);
+  return chunks.map(chunk => {
+    if (chunk[0] === "\n") chunk = "\u200b" + chunk;
+    if (chunk[chunk.length - 1] === "\n") chunk = chunk + "\u200b";
+    return chunk;
+  });
+}
+
 export const DBDateFormat = "YYYY-MM-DD HH:mm:ss";