feat: rewrite cover generation — 480×800 portrait, themed AI backgrounds, two-layer pipeline

Made-with: Cursor

src/cover.py

@@ -1,5 +1,6 @@
 import logging
 import os
+from collections import Counter
 from datetime import date
 from io import BytesIO
 from urllib.parse import quote
@@ -8,14 +9,50 @@ import requests
 from PIL import Image as PILImage, ImageDraw, ImageFont
 
 import config
-from src.images import _resize_to_fit
 
 logger = logging.getLogger(__name__)
 
+CATEGORY_PROMPTS = {
+    "Government": (
+        "Watercolor painting of Plymouth Massachusetts town hall, "
+        "New England civic architecture, soft morning light, no text"
+    ),
+    "Culture": (
+        "Plymouth Massachusetts waterfront boardwalk, autumn festival "
+        "atmosphere, warm tones, New England charm, no text"
+    ),
+    "Culture Calendar": (
+        "Plymouth Massachusetts harbor at golden hour, sailboats and "
+        "historic waterfront, warm autumn palette, no text"
+    ),
+    "Sports": (
+        "Plymouth Massachusetts harbor marina at sunrise, boats and "
+        "morning mist on Cape Cod Bay, no text"
+    ),
+    "Environment": (
+        "Cape Cod Bay shoreline near Plymouth Massachusetts, coastal "
+        "wetlands and dune grass, golden hour light, no text"
+    ),
+    "Opinion": (
+        "Plymouth Rock historic site in Plymouth Massachusetts, "
+        "dramatic sky, iconic New England landmark, no text"
+    ),
+    "Feature": (
+        "Downtown Plymouth Massachusetts street scene, historic "
+        "brick storefronts, New England small town charm, no text"
+    ),
+    "Default": (
+        "Aerial view of Plymouth Massachusetts coastal town, serene "
+        "harbor, Cape Cod Bay, New England charm, no text"
+    ),
+}
+
 
 def _get_font(size: int) -> ImageFont.FreeTypeFont:
     try:
-        return ImageFont.truetype("/usr/share/fonts/truetype/dejavu/DejaVuSans-Bold.ttf", size)
+        return ImageFont.truetype(
+            "/usr/share/fonts/truetype/dejavu/DejaVuSans-Bold.ttf", size
+        )
     except OSError:
         pass
     try:
@@ -25,41 +62,76 @@ def _get_font(size: int) -> ImageFont.FreeTypeFont:
     return ImageFont.load_default()
 
 
-def generate_text_cover(
+def _get_dominant_category(categories: list[str]) -> str:
+    if not categories:
+        return "Default"
+    counter = Counter(categories)
+    most_common = counter.most_common(1)[0][0]
+    return most_common
+
+
+def _draw_text_overlays(
+    draw: ImageDraw.ImageDraw,
+    width: int,
+    height: int,
+    week_start: date,
+    week_end: date,
+    headlines: list[str],
+) -> None:
+    title_font = _get_font(38)
+    date_font = _get_font(20)
+    headline_font = _get_font(14)
+
+    draw.rectangle([(0, 0), (width, 90)], fill=(0, 0, 0, 204))
+    draw.text(
+        (width // 2, 20), "Plymouth Independent",
+        fill="white", font=title_font, anchor="mt",
+    )
+
+    iso_week = week_start.isocalendar()[1]
+    date_str = (
+        f"Week {iso_week} \u00b7 "
+        f"{week_start.strftime('%b %d')} \u2013 {week_end.strftime('%b %d, %Y')}"
+    )
+    draw.text(
+        (width // 2, 62), date_str,
+        fill=(220, 220, 220), font=date_font, anchor="mt",
+    )
+
+    if headlines:
+        max_headlines = min(len(headlines), 5)
+        strip_height = 28 + max_headlines * 22
+        strip_top = height - strip_height
+        draw.rectangle(
+            [(0, strip_top), (width, height)], fill=(0, 0, 0, 170)
+        )
+        y = strip_top + 8
+        for headline in headlines[:max_headlines]:
+            text = f"\u2022 {headline}"
+            if len(text) > 45:
+                text = text[:42] + "..."
+            draw.text((16, y), text, fill="white", font=headline_font)
+            y += 22
+
+
+def generate_programmatic_cover(
     output_dir: str,
     week_start: date,
     week_end: date,
     headlines: list[str],
+    categories: list[str],
 ) -> str:
     os.makedirs(output_dir, exist_ok=True)
-    img = PILImage.new("RGB", (800, 480), color="white")
+    w, h = config.COVER_SIZE
+    img = PILImage.new("RGBA", (w, h), color=(245, 245, 245, 255))
     draw = ImageDraw.Draw(img)
 
-    title_font = _get_font(36)
-    date_font = _get_font(20)
-    headline_font = _get_font(16)
-
-    draw.text((400, 30), "Plymouth Independent", fill="black",
-              font=title_font, anchor="mt")
-
-    date_str = f"Week of {week_start.strftime('%b %d')} \u2013 {week_end.strftime('%b %d, %Y')}"
-    draw.text((400, 80), date_str, fill="gray", font=date_font, anchor="mt")
-
-    draw.line([(50, 110), (750, 110)], fill="black", width=2)
-
-    y = 130
-    for i, headline in enumerate(headlines[:8]):
-        if y > 440:
-            break
-        prefix = f"\u2022 {headline}"
-        if len(prefix) > 70:
-            prefix = prefix[:67] + "..."
-        draw.text((60, y), prefix, fill="black", font=headline_font)
-        y += 35
+    _draw_text_overlays(draw, w, h, week_start, week_end, headlines)
 
+    out = img.convert("RGB")
     filename = f"cover-{week_start.isoformat()}-text.jpg"
     path = os.path.join(output_dir, filename)
-    img.save(path, format="JPEG", progressive=False, quality=90)
+    out.save(path, format="JPEG", progressive=False, quality=90)
     return path
 
 
@@ -68,47 +140,41 @@ def generate_ai_cover(
     week_start: date,
     week_end: date,
     headlines: list[str],
+    categories: list[str],
 ) -> str:
     os.makedirs(output_dir, exist_ok=True)
+    w, h = config.COVER_SIZE
 
-    top_headlines = ", ".join(headlines[:3])
-    prompt = (
-        f"Newspaper front page illustration for Plymouth Massachusetts local news. "
-        f"Headlines: {top_headlines}. "
-        f"Classic broadsheet newspaper style, black and white ink drawing, editorial illustration."
-    )
+    dominant = _get_dominant_category(categories)
+    prompt = CATEGORY_PROMPTS.get(dominant, CATEGORY_PROMPTS["Default"])
     url = config.POLLINATIONS_URL.format(prompt=quote(prompt))
 
     try:
         response = requests.get(url, timeout=60)
         response.raise_for_status()
 
-        img = PILImage.open(BytesIO(response.content))
-        if img.mode != "RGB":
-            img = img.convert("RGB")
-        img = _resize_to_fit(img)
+        bg = PILImage.open(BytesIO(response.content))
+        if bg.mode not in ("RGB", "RGBA"):
+            bg = bg.convert("RGB")
+        bg = bg.resize((w, h), PILImage.Resampling.LANCZOS)
 
-        draw = ImageDraw.Draw(img)
-        title_font = _get_font(28)
-        date_font = _get_font(16)
-
-        draw.text((img.width // 2, 15), "Plymouth Independent",
-                  fill="white", font=title_font, anchor="mt",
-                  stroke_width=2, stroke_fill="black")
-
-        date_str = f"Week of {week_start.strftime('%b %d')} \u2013 {week_end.strftime('%b %d, %Y')}"
-        draw.text((img.width // 2, 50), date_str,
-                  fill="white", font=date_font, anchor="mt",
-                  stroke_width=1, stroke_fill="black")
+        img = bg.convert("RGBA")
+        overlay = PILImage.new("RGBA", (w, h), (0, 0, 0, 0))
+        draw = ImageDraw.Draw(overlay)
+        _draw_text_overlays(draw, w, h, week_start, week_end, headlines)
+        img = PILImage.alpha_composite(img, overlay)
 
+        out = img.convert("RGB")
         filename = f"cover-{week_start.isoformat()}-ai.jpg"
         path = os.path.join(output_dir, filename)
-        img.save(path, format="JPEG", progressive=False, quality=90)
+        out.save(path, format="JPEG", progressive=False, quality=90)
         return path
 
     except Exception as e:
-        logger.error("AI cover generation failed, falling back to text: %s", e)
-        return generate_text_cover(output_dir, week_start, week_end, headlines)
+        logger.error("AI cover generation failed, falling back to programmatic: %s", e)
+        return generate_programmatic_cover(
+            output_dir, week_start, week_end, headlines, categories
+        )
 
 
 def generate_cover(
@@ -117,7 +183,12 @@ def generate_cover(
     week_start: date,
     week_end: date,
     headlines: list[str],
+    categories: list[str],
 ) -> str:
     if method == "ai":
-        return generate_ai_cover(output_dir, week_start, week_end, headlines)
-    return generate_text_cover(output_dir, week_start, week_end, headlines)
+        return generate_ai_cover(
+            output_dir, week_start, week_end, headlines, categories
+        )
+    return generate_programmatic_cover(
+        output_dir, week_start, week_end, headlines, categories
+    )