add a function to detetct the toc

main.py

@@ -1,9 +1,12 @@
 from pathlib import Path
 
 import httpx
+import pymupdf # type: ignore
 
+# where to save / load data
 DATA_DIR = Path.cwd() / "data"
 
+# URLs of the raw PDFs to download
 RAW_PDF_URLS = [
     "https://www.ebooksgratuits.com/ebooksfrance/moliere-oeuvres_completes_1.pdf",
     "https://www.ebooksgratuits.com/ebooksfrance/moliere-oeuvres_completes_2.pdf",
@@ -19,14 +22,53 @@ def download_pdf(url: str, output_path: str) -> None:
                 f.write(chunk)
 
 
+def detect_toc(doc: pymupdf.Document) -> tuple[int, int]:
+    """Detect the table of contents in the first quarter of the document.
+    
+    Args:
+        doc: A pymupdf Document object representing the PDF document.
+
+    Returns:
+        A tuple containing the start and end page indices of the TOC.
+        If no TOC is found, returns (-1, -1).
+    """
+    start = -1
+    end = -1
+    i = 0
+
+    for page in doc[:len(doc) // 4]:
+        if page.get_links():
+            start = i
+            break
+        i += 1
+
+    if start == -1:
+        print("No table of contents found in the first quarter of the document.")
+        return -1, -1  # no TOC found
+
+    for page in doc[start:len(doc) // 4]:
+        if not page.get_links():
+            end = i
+            break
+        i += 1
+
+    if end == -1:
+        end = len(doc) // 4
+
+    print(f"Table of contents detected from page {start} to {end}.")
+    return start, end
+
+
 def main():
     # make sure data directory exists
     DATA_DIR.mkdir(parents=True, exist_ok=True)
 
     # download raw PDFs if they don't already exist
+    paths = []
     for url in RAW_PDF_URLS:
         filename = url.split("/")[-1]
         output_path = DATA_DIR / filename
+        paths.append(output_path)
         if not output_path.exists():
             print(f"Downloading {filename}...")
             download_pdf(url, output_path)
@@ -34,6 +76,39 @@ def main():
             print(f"{filename} already exists, skipping download.")
 
     # fetch from
+
+    for path in paths:
+        with open(path, "rb") as f:
+            doc = pymupdf.open(f)
+            # process the document as needed
+
+            # detect toc in first quarter of the document
+            toc_start, toc_end = detect_toc(doc)
+            breakpoint()
+
+            # read toc
+
+            # extract info from toc
+            data = {
+                "title": None,
+                "actors": None,
+                "acts": [
+                    {
+                        "start_page": 0,
+                        "end_page": 0,
+                        "title": None,
+                        "scenes": [
+                            {
+                                "start_page": 0,
+                                "end_page": 0,
+                                "title": None,
+                            }
+                        ]
+                    }
+                ]
+            }
+            breakpoint()
+    # 1. download raw PDFs from URLs
     # 2. process data into clean tiny-shakespeare like format
 
     # 3. save processed data to disk