From 683de4a46a8e9ef624bb56ce72cd292144fec6fd Mon Sep 17 00:00:00 2001
From: Tuan-Dat Tran <tuan-dat.tran@tudattr.dev>
Date: Fri, 27 Feb 2026 02:31:35 +0100
Subject: [PATCH] Add retry logic with exponential backoff for 429 rate limits

---
 README.md  |  8 ++++----
 hydrate.py | 50 +++++++++++++++++++++++++++++++++-----------------
 2 files changed, 37 insertions(+), 21 deletions(-)

diff --git a/README.md b/README.md
index 991263d..1fa395b 100644
--- a/README.md
+++ b/README.md
@@ -352,12 +352,12 @@ for name, count in sorted(cards.items()):
 
 ## Collection Stats
 
-- **Total cards:** 0
-- **Unique cards:** 0
+- **Total cards:** 1356
+- **Unique cards:** 916
 - **By type:**
   - Artifacts: 77
-  - Creatures: 390
-  - Enchantments: 63
+  - Creatures: 392
+  - Enchantments: 64
   - Instants: 109
   - Lands: 72
   - Planeswalkers: 2
diff --git a/hydrate.py b/hydrate.py
index ac23050..63f879d 100644
--- a/hydrate.py
+++ b/hydrate.py
@@ -40,27 +40,43 @@ def parse_decklist(filepath: str) -> list[dict]:
     return cards
 
 
-def fetch_card(name: str) -> Optional[dict]:
+def fetch_card(name: str, retry_count: int = 3) -> Optional[dict]:
     """Fetch card data from Scryfall API using fuzzy search."""
     encoded = urllib.parse.quote(name)
     url = f"{SCRYFALL_API}/cards/named?fuzzy={encoded}"
     
-    try:
-        req = urllib.request.Request(url, headers={
-            "User-Agent": "EDHDeckBuilder/1.0",
-            "Accept": "*/*"
-        })
-        with urllib.request.urlopen(req, timeout=30) as response:
-            return json.loads(response.read().decode("utf-8"))
-    except urllib.error.HTTPError as e:
-        print(f"  Error fetching '{name}': HTTP {e.code}", file=sys.stderr)
-        return None
-    except urllib.error.URLError as e:
-        print(f"  Error fetching '{name}': {e.reason}", file=sys.stderr)
-        return None
-    except json.JSONDecodeError:
-        print(f"  Error parsing response for '{name}'", file=sys.stderr)
-        return None
+    for attempt in range(retry_count):
+        try:
+            req = urllib.request.Request(url, headers={
+                "User-Agent": "EDHDeckBuilder/1.0",
+                "Accept": "*/*"
+            })
+            with urllib.request.urlopen(req, timeout=30) as response:
+                return json.loads(response.read().decode("utf-8"))
+        except urllib.error.HTTPError as e:
+            if e.code == 429:
+                retry_after = int(e.headers.get("Retry-After", 60))
+                print(f"  Rate limited. Waiting {retry_after}s...", file=sys.stderr)
+                time.sleep(retry_after)
+            elif e.code == 404:
+                print(f"  Error fetching '{name}': Not found", file=sys.stderr)
+                return None
+            else:
+                if attempt < retry_count - 1:
+                    wait_time = 2 ** attempt
+                    print(f"  HTTP {e.code}, retrying in {wait_time}s...", file=sys.stderr)
+                    time.sleep(wait_time)
+                else:
+                    print(f"  Error fetching '{name}': HTTP {e.code}", file=sys.stderr)
+                    return None
+        except urllib.error.URLError as e:
+            print(f"  Error fetching '{name}': {e.reason}", file=sys.stderr)
+            return None
+        except json.JSONDecodeError:
+            print(f"  Error parsing response for '{name}'", file=sys.stderr)
+            return None
+    
+    return None
 
 
 def extract_card_info(card_data: dict) -> dict: