feat: add originalSubject and originalTeacher

src/client.ts

@@ -2,7 +2,7 @@ import axios from 'axios'
 import { BASE_URL, USER_AGENT } from './constants'
 import DataManager from './data'
 import School from './models/School'
-import type Timetable from './models/Timetable'
+import type { Timetable } from './models/Timetable'
 import { encodeBase64, encodeEUCKR } from './utils/encode'
 import { parseResponse } from './utils/parse'
 
@@ -64,13 +64,26 @@ export default class Comcigan {
         cls.slice(1).map((day, dIdx) =>
           day.slice(1).map((period, pIdx) => {
             const p = period.toString()
+            const changed =
+              period !== original[gIdx + 1][cIdx + 1][dIdx + 1][pIdx + 1]
 
             return {
               subject: subjects[Number(p.slice(0, p.length - teachersLen - 1))],
               teacher: teachers[Number(p.slice(-teachersLen))],
-              changed:
-                period !== original[gIdx + 1][cIdx + 1][dIdx + 1][pIdx + 1],
-            }
+              changed,
+              ...(changed
+                ? {
+                    originalSubject:
+                      subjects[
+                        original[gIdx + 1][cIdx + 1][dIdx + 1][pIdx + 1]
+                      ],
+                    originalTeacher:
+                      teachers[
+                        original[gIdx + 1][cIdx + 1][dIdx + 1][pIdx + 1]
+                      ],
+                  }
+                : {}),
+            } as Timetable
           }),
         ),
       ),

src/models/School.ts

@@ -1,7 +1,7 @@
 import Comcigan from '../client'
 import Fetcher from './Fetcher'
 import type Region from './Region'
-import type Timetable from './Timetable'
+import type { Timetable } from './Timetable'
 
 interface ISchool {
   /** 학교 코드 */

src/models/Timetable.ts

@@ -1,8 +1,19 @@
-export default interface Timetable {
+export type Timetable = {
   /** 과목 */
   subject: string
   /** 교사 */
   teacher: string
   /** 변경 여부 */
   changed: boolean
-}
+} & (
+  | {
+      changed: true
+      /** 변경 전 과목 */
+      originalSubject: string
+      /** 변경 전 교사 */
+      originalTeacher: string
+    }
+  | {
+      changed: false
+    }
+)