first commit

public/js/recipe-search.js

@@ -0,0 +1,49 @@
+function normalizeSearchText(value) {
+  return String(value ?? '').trim().toLocaleLowerCase().replace(/\s+/g, ' ');
+}
+
+function ingredientNames(recipe) {
+  return (recipe.ingredientGroups ?? [])
+    .flatMap((group) => group.items ?? [])
+    .map((item) => item.name)
+    .filter(Boolean);
+}
+
+export function rankRecipeMatch(recipe, query) {
+  const normalizedQuery = normalizeSearchText(query);
+  if (!normalizedQuery) return { score: 0, matchedIngredients: [] };
+
+  const ingredients = ingredientNames(recipe);
+  const matchedIngredients = ingredients.filter((name) => (
+    normalizeSearchText(name).includes(normalizedQuery)
+  ));
+  const hasExactIngredient = matchedIngredients.some((name) => (
+    normalizeSearchText(name) === normalizedQuery
+  ));
+  const title = normalizeSearchText(recipe.title);
+  const tags = (recipe.tags ?? []).map(normalizeSearchText);
+  const summary = normalizeSearchText(recipe.summary);
+
+  let score = 0;
+  if (hasExactIngredient) score = 500;
+  else if (matchedIngredients.length > 0) score = 400;
+  else if (title === normalizedQuery) score = 350;
+  else if (title.includes(normalizedQuery)) score = 300;
+  else if (tags.includes(normalizedQuery)) score = 250;
+  else if (tags.some((tag) => tag.includes(normalizedQuery))) score = 200;
+  else if (summary.includes(normalizedQuery)) score = 100;
+
+  return { score, matchedIngredients };
+}
+
+export function searchRecipes(recipes, query) {
+  if (!normalizeSearchText(query)) {
+    return recipes.map((recipe) => ({ recipe, score: 0, matchedIngredients: [] }));
+  }
+
+  return recipes
+    .map((recipe, index) => ({ recipe, index, ...rankRecipeMatch(recipe, query) }))
+    .filter(({ score }) => score > 0)
+    .sort((a, b) => b.score - a.score || a.index - b.index)
+    .map(({ recipe, score, matchedIngredients }) => ({ recipe, score, matchedIngredients }));
+}