From 484675bec76ff34da5b70926cf5a1b7d89249720 Mon Sep 17 00:00:00 2001
From: Kiril Kovachev <ktkovachev@gmail.com>
Date: Mon, 4 Nov 2024 00:18:58 +0000
Subject: [PATCH] Add rudimentary sniper script

---
 cli_sniper.py    | 18 ++++++++++++++++++
 requirements.txt |  1 +
 sniper.py        | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 66 insertions(+)
 create mode 100644 cli_sniper.py
 create mode 100644 requirements.txt
 create mode 100644 sniper.py

diff --git a/cli_sniper.py b/cli_sniper.py
new file mode 100644
index 0000000..c612fb1
--- /dev/null
+++ b/cli_sniper.py
@@ -0,0 +1,18 @@
+import sys
+from sniper import Sniper
+
+class CLISniper(Sniper):
+    UPDATE_MESSAGE = "The detected accommodation page is different to the previous one, indicating a possible change in application status! Please check the accommodation page as soon as possbible!"
+    def on_change(self):
+        print(self.UPDATE_MESSAGE)
+    
+    def on_same(self):
+        print("No change from last check...", file=sys.stderr)
+
+def main():
+    print("Now running Accommodation sniper...", file=sys.stderr)
+    sniper = CLISniper()
+    sniper.loop()
+
+if __name__ == "__main__":
+    main()
\ No newline at end of file
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..663bd1f
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1 @@
+requests
\ No newline at end of file
diff --git a/sniper.py b/sniper.py
new file mode 100644
index 0000000..f616131
--- /dev/null
+++ b/sniper.py
@@ -0,0 +1,47 @@
+from abc import ABC, abstractmethod
+import time
+from typing import Optional
+import requests
+import difflib
+
+ACCOMMODATION_URL = "https://warwick.ac.uk/services/accommodation/students/current/"
+def get_accommodation_page() -> Optional[str]:
+    r = requests.get(ACCOMMODATION_URL)
+    if r is None:
+        return None
+    else:
+        return r.text
+
+def get_difference(page_before: str, page_after: str) -> Optional[list[str]]:
+    if page_before == page_after:
+        return None
+    
+    return [*difflib.context_diff(page_before.splitlines(), page_after.splitlines())]
+
+THIRTY_MINUTES = 30 * 60
+TIMEOUT = THIRTY_MINUTES
+class Sniper(ABC):
+    previous_page: str
+
+    def __init__(self):
+        self.previous_page = get_accommodation_page()
+
+    def update(self) -> None:
+        current_page = get_accommodation_page()
+        if get_difference(self.previous_page, current_page):
+            self.on_change()
+        else:
+            self.on_same()
+        self.previous_page = current_page
+
+    @abstractmethod
+    def on_change(self) -> None:
+        pass
+    
+    def on_same(self) -> None:
+        pass
+
+    def loop(self):
+        while True:
+            time.sleep(TIMEOUT)
+            self.update()