add: script to generate thumbnails

scripts/lib/meals.js

@@ -0,0 +1,81 @@
+const fs = require("fs");
+const path = require("path");
+
+const repoRoot = path.resolve(__dirname, "..", "..");
+const mealsPath = path.join(repoRoot, "data", "meals.json");
+
+function validateThumbnail(meal, index) {
+  if (meal.thumbnail === undefined) {
+    return;
+  }
+
+  if (
+    !meal.thumbnail ||
+    typeof meal.thumbnail !== "object" ||
+    Array.isArray(meal.thumbnail)
+  ) {
+    throw new Error(`Meal ${index} has an invalid "thumbnail" object`);
+  }
+
+  if (meal.thumbnail.focus === undefined) {
+    return;
+  }
+
+  const { focus } = meal.thumbnail;
+
+  if (!focus || typeof focus !== "object" || Array.isArray(focus)) {
+    throw new Error(`Meal ${index} has an invalid "thumbnail.focus" object`);
+  }
+
+  for (const axis of ["x", "y"]) {
+    if (typeof focus[axis] !== "number" || !Number.isFinite(focus[axis])) {
+      throw new Error(
+        `Meal ${index} has a non-numeric thumbnail focus value for "${axis}"`
+      );
+    }
+
+    if (focus[axis] < 0 || focus[axis] > 1) {
+      throw new Error(
+        `Meal ${index} thumbnail focus "${axis}" must be between 0 and 1`
+      );
+    }
+  }
+}
+
+function validateMeals(meals) {
+  if (!Array.isArray(meals)) {
+    throw new Error("data/meals.json must contain an array");
+  }
+
+  for (const [index, meal] of meals.entries()) {
+    if (!meal || typeof meal !== "object") {
+      throw new Error(`Meal at index ${index} must be an object`);
+    }
+
+    for (const field of ["id", "title", "description"]) {
+      if (typeof meal[field] !== "string" || meal[field].length === 0) {
+        throw new Error(`Meal ${index} is missing required string field "${field}"`);
+      }
+    }
+
+    if (meal.position !== undefined && typeof meal.position !== "string") {
+      throw new Error(`Meal ${index} has a non-string "position" value`);
+    }
+
+    validateThumbnail(meal, index);
+  }
+}
+
+function loadMeals() {
+  const meals = JSON.parse(fs.readFileSync(mealsPath, "utf8"));
+
+  validateMeals(meals);
+
+  return meals;
+}
+
+module.exports = {
+  loadMeals,
+  mealsPath,
+  repoRoot,
+};