refactor searchBook to allow for regex matches

src/backend/database.py

@@ -1,6 +1,7 @@
 import datetime
 import json
 import os
+import re
 import sqlite3 as sql
 import sys
 import tempfile
@@ -382,49 +383,67 @@ class Database:
         """
         return self.query_db("SELECT id FROM media ORDER BY id DESC", one=True)[0]
 
-    def searchBook(self, data: dict[str, str]) -> list[tuple[BookData, int]]:
+    def searchBook(
+        self, data: dict[str, str]
+    ) -> Optional[list[tuple["BookData", int, int]]]:
         """
-        Search a book in the database based on the sent data.
+        Search a book in the database using regex against signature/title.
 
         Args:
-            data (dict[str, str]): A dictionary containing the data to be searched for. The dictionary can contain the following:
-            - signature: The signature of the book
-            - title: The title of the book
+            data: may contain:
+            - "signature": regex to match against BookData.signature
+            - "title":     regex to match against BookData.title
 
         Returns:
-            list[tuple[BookData, int]]: A list of tuples containing the wrapped Metadata and the id of the book
+            list of (BookData, app_id, prof_id) tuples, or None if invalid args
         """
-        rdata = self.query_db("SELECT * FROM media WHERE deleted=0")
-        # log.debug(rdata, len(rdata))
+
+        # Determine mode (kept compatible with your original logic)
         mode = 0
-        if len(data) == 1:
-            if "signature" in data.keys():
-                mode = 1
-            elif "title" in data.keys():
-                mode = 2
-        elif len(data) == 2:
+        if len(data) == 1 and "signature" in data:
+            mode = 1
+        elif len(data) == 1 and "title" in data:
+            mode = 2
+        elif len(data) == 2 and "signature" in data and "title" in data:
             mode = 3
         else:
             return None
-        ret = []
-        for book in rdata:
-            bookdata = BookData().from_string(book[1])
-            app_id = book[2]
-            prof_id = book[3]
+
+        def _compile(expr: str) -> re.Pattern:
+            try:
+                return re.compile(expr, re.IGNORECASE | re.UNICODE)
+            except re.error:
+                # If user provided a broken regex, treat it as a literal
+                return re.compile(re.escape(expr), re.IGNORECASE | re.UNICODE)
+
+        sig_re = _compile(data["signature"]) if mode in (1, 3) else None
+        title_re = _compile(data["title"]) if mode in (2, 3) else None
+
+        # Fetch candidates once
+        rows = self.query_db("SELECT * FROM media WHERE deleted=0")
+
+        results: list[tuple["BookData", int, int]] = []
+        for row in rows:
+            bookdata = BookData().from_string(
+                row[1]
+            )  # assumes row[1] is the serialized bookdata
+            app_id = row[2]
+            prof_id = row[3]
+
+            sig_val = getattr(bookdata, "signature", None) or ""
+            title_val = getattr(bookdata, "title", None) or ""
+
             if mode == 1:
-                if data["signature"] in bookdata.signature:
-                    ret.append((bookdata, app_id, prof_id))
+                if sig_re.search(sig_val):
+                    results.append((bookdata, app_id, prof_id))
             elif mode == 2:
-                if data["title"] in bookdata.title:
-                    ret.append((bookdata, app_id, prof_id))
-            elif mode == 3:
-                if (
-                    data["signature"] in bookdata.signature
-                    and data["title"] in bookdata.title
-                ):
-                    ret.append((bookdata, app_id, prof_id))
-        # log.debug(ret)
-        return ret
+                if title_re.search(title_val):
+                    results.append((bookdata, app_id, prof_id))
+            else:  # mode == 3
+                if sig_re.search(sig_val) and title_re.search(title_val):
+                    results.append((bookdata, app_id, prof_id))
+
+        return results
 
     def setAvailability(self, book_id: str, available: str):
         """