const state = {
  catalog: null,
  itemByKey: new Map(),
};

const inventoryInput = document.querySelector("#inventory-input");
const quickItemInput = document.querySelector("#quick-item");
const quickQtyInput = document.querySelector("#quick-qty");
const itemList = document.querySelector("#item-list");
const summaryText = document.querySelector("#summary-text");
const resultsRoot = document.querySelector("#results");
const chipsRoot = document.querySelector("#inventory-chips");

document.querySelector("#analyze-btn").addEventListener("click", render);
document.querySelector("#sample-btn").addEventListener("click", () => {
  inventoryInput.value = [
    "Water",
    "2x Ableroot",
    "2x Oil",
    "2x Gravel Beetle",
    "Linen Cloth",
    "Seaweed",
    "Salt",
  ].join("\n");
  render();
});
document.querySelector("#clear-btn").addEventListener("click", () => {
  inventoryInput.value = "";
  quickItemInput.value = "";
  quickQtyInput.value = "1";
  render();
});
document.querySelector("#add-item").addEventListener("click", addQuickItem);
quickItemInput.addEventListener("keydown", (event) => {
  if (event.key === "Enter") {
    event.preventDefault();
    addQuickItem();
  }
});
inventoryInput.addEventListener("input", renderInventoryPreview);

bootstrap().catch((error) => {
  summaryText.textContent = "Failed to load crafting catalog.";
  resultsRoot.innerHTML = `<div class="empty-state">${escapeHtml(error.message)}</div>`;
});

async function bootstrap() {
  const response = await fetch("/api/catalog");
  if (!response.ok) {
    throw new Error(`Catalog request failed with ${response.status}`);
  }

  state.catalog = await response.json();
  state.itemByKey = buildItemIndex(state.catalog.items || []);
  hydrateItemList(state.catalog.item_names || []);
  summaryText.textContent = `Loaded ${state.catalog.item_names.length} known items and ${state.catalog.craftables.length} craftable entries.`;
  render();
}

function buildItemIndex(items) {
  const index = new Map();
  for (const item of items) {
    index.set(normalizeName(item.name), item);
  }
  return index;
}

function hydrateItemList(names) {
  itemList.innerHTML = names.map((name) => `<option value="${escapeHtml(name)}"></option>`).join("");
}

function addQuickItem() {
  const name = quickItemInput.value.trim();
  const qty = Math.max(1, Number.parseInt(quickQtyInput.value || "1", 10) || 1);
  if (!name) {
    return;
  }

  const line = qty > 1 ? `${qty}x ${name}` : name;
  inventoryInput.value = inventoryInput.value.trim()
    ? `${inventoryInput.value.trim()}\n${line}`
    : line;

  quickItemInput.value = "";
  quickQtyInput.value = "1";
  render();
}

function render() {
  renderInventoryPreview();

  if (!state.catalog) {
    return;
  }

  const inventory = parseInventory(inventoryInput.value);
  const craftable = findCraftableRecipes(state.catalog.craftables, inventory);

  if (!craftable.length) {
    summaryText.textContent = `No craftable recipes found from ${inventory.totalKinds} inventory item types.`;
    resultsRoot.innerHTML = `
      <div class="empty-state">
        Add more ingredients or load the sample inventory to see matching recipes.
      </div>
    `;
    return;
  }

  summaryText.textContent = `${craftable.length} recipe matches from ${inventory.totalKinds} inventory item types.`;
  resultsRoot.innerHTML = craftable.map(renderRecipeCard).join("");
  wireResultImages();
}

function renderInventoryPreview() {
  const inventory = parseInventory(inventoryInput.value);
  const entries = Object.values(inventory.byKey).sort((a, b) => a.name.localeCompare(b.name));

  if (!entries.length) {
    chipsRoot.innerHTML = `<div class="chip">No inventory entered yet</div>`;
    return;
  }

  chipsRoot.innerHTML = entries
    .map((entry) => `<div class="chip">${escapeHtml(entry.display)}</div>`)
    .join("");
}

function parseInventory(raw) {
  const byKey = {};
  const lines = raw
    .split("\n")
    .map((line) => line.trim())
    .filter(Boolean);

  for (const line of lines) {
    const parsed = parseStackText(line);
    if (!parsed.name) {
      continue;
    }

    const key = normalizeName(parsed.name);
    if (!byKey[key]) {
      byKey[key] = {
        name: parsed.name,
        count: 0,
        display: "",
      };
    }

    byKey[key].count += parsed.count;
    byKey[key].display = `${byKey[key].count}x ${byKey[key].name}`;
  }

  return {
    byKey,
    totalKinds: Object.keys(byKey).length,
  };
}

function findCraftableRecipes(items, inventory) {
  const matches = [];

  for (const item of items) {
    for (const recipe of item.recipes || []) {
      if (normalizeName(recipe.result || "") !== normalizeName(item.name || "")) {
        continue;
      }

      const requirements = collapseRequirements(recipe.ingredients || []);

      if (!requirements.length) {
        continue;
      }

      let maxCrafts = Number.POSITIVE_INFINITY;
      let canCraft = true;

      for (const requirement of requirements) {
        const have = availableCountForIngredient(requirement.name, inventory);
        if (have < requirement.count) {
          canCraft = false;
          break;
        }
        maxCrafts = Math.min(maxCrafts, Math.floor(have / requirement.count));
      }

      if (!canCraft) {
        continue;
      }

      matches.push({
        item,
        recipe,
        maxCrafts: Number.isFinite(maxCrafts) ? maxCrafts : 0,
        resultYield: parseResultYield(recipe.result_count),
      });
    }
  }

  return matches.sort((left, right) => {
    if (right.maxCrafts !== left.maxCrafts) {
      return right.maxCrafts - left.maxCrafts;
    }
    return left.item.name.localeCompare(right.item.name);
  });
}

function renderRecipeCard(entry) {
  const initials = escapeHtml(entry.item.name.slice(0, 2).toUpperCase());
  const ingredients = (entry.recipe.ingredients || [])
    .map((ingredient) => `<span class="ingredient-pill">${escapeHtml(ingredient)}</span>`)
    .join("");

  const canonicalImageUrl = normalizeImageUrl(entry.item.image_url || "");
  const image = canonicalImageUrl
    ? `<img src="${escapeHtml(canonicalImageUrl)}" data-fallback-src="${escapeHtml(fallbackImageUrl(canonicalImageUrl))}" alt="${escapeHtml(entry.item.name)}">`
    : `<div class="result-fallback">${initials}</div>`;

  const station = entry.recipe.station ? `Station: ${escapeHtml(entry.recipe.station)}` : "Station: Any";
  const yieldLabel = entry.resultYield > 1 ? `${entry.resultYield}x per craft` : "1x per craft";

  return `
    <article class="result-card">
      ${image}
      <div>
        <div class="result-top">
          <div>
            <h3 class="result-name">
              <a href="${escapeHtml(entry.item.url)}" target="_blank" rel="noreferrer">${escapeHtml(entry.item.name)}</a>
            </h3>
            <p class="meta">${station} · ${yieldLabel}</p>
          </div>
          <div class="recipe-badge">${entry.maxCrafts} craft${entry.maxCrafts === 1 ? "" : "s"} possible</div>
        </div>
        <div class="ingredients">${ingredients}</div>
      </div>
    </article>
  `;
}

function wireResultImages() {
  const images = resultsRoot.querySelectorAll("img[data-fallback-src]");
  for (const image of images) {
    image.onerror = () => {
      const fallback = image.dataset.fallbackSrc || "";
      if (!fallback || image.dataset.failedOnce === "1") {
        image.onerror = null;
        image.replaceWith(createFallbackNode(image.alt || "?"));
        return;
      }

      image.dataset.failedOnce = "1";
      image.src = fallback;
    };
  }
}

function createFallbackNode(label) {
  const node = document.createElement("div");
  node.className = "result-fallback";
  node.textContent = String(label).slice(0, 2).toUpperCase();
  return node;
}

function parseStackText(raw) {
  const cleaned = raw.replace(/×/g, "x").trim();
  if (!cleaned) {
    return { name: "", count: 0 };
  }

  const prefixed = cleaned.match(/^(\d+)\s*x\s+(.+)$/i);
  if (prefixed) {
    return {
      count: Number.parseInt(prefixed[1], 10),
      name: prefixed[2].trim(),
    };
  }

  return {
    count: 1,
    name: cleaned,
  };
}

function parseResultYield(raw) {
  const parsed = parseStackText(raw || "1x Result");
  return parsed.count || 1;
}

function normalizeImageUrl(raw) {
  const value = String(raw || "").trim();
  if (!value) {
    return "";
  }

  const [base, query = ""] = value.split("?");
  const canonicalBase = base.replace(/\/revision\/latest\/scale-to-width-down\/\d+$/, "/revision/latest");
  return query ? `${canonicalBase}?${query}` : canonicalBase;
}

function fallbackImageUrl(raw) {
  const value = normalizeImageUrl(raw);
  if (!value) {
    return "";
  }

  const [base] = value.split("?");
  return base.replace(/\/revision\/latest$/, "");
}

function collapseRequirements(ingredients) {
  const counts = new Map();

  for (const ingredient of ingredients) {
    const parsed = parseStackText(ingredient);
    if (!parsed.name) {
      continue;
    }

    const key = normalizeName(parsed.name);
    const existing = counts.get(key) || {
      name: parsed.name,
      count: 0,
    };

    existing.count += parsed.count;
    counts.set(key, existing);
  }

  return Array.from(counts.values());
}

function availableCountForIngredient(ingredientName, inventory) {
  const requirementKey = normalizeName(ingredientName);

  if (requirementKey === "water") {
    return countInventory(inventory, ["water", "clean water"]);
  }

  if (requirementKey === "meat") {
    return countMatchingInventory(inventory, (item) => isMeatLike(item));
  }

  if (requirementKey === "vegetable") {
    return countMatchingInventory(inventory, (item) => isVegetableLike(item));
  }

  if (requirementKey === "ration ingredient") {
    return countMatchingInventory(inventory, (item) => isRationIngredient(item));
  }

  return inventory.byKey[requirementKey]?.count || 0;
}

function countInventory(inventory, keys) {
  return keys.reduce((sum, key) => sum + (inventory.byKey[key]?.count || 0), 0);
}

function countMatchingInventory(inventory, predicate) {
  let total = 0;

  for (const [key, entry] of Object.entries(inventory.byKey)) {
    if (!predicate(resolveInventoryItem(key, entry.name))) {
      continue;
    }
    total += entry.count;
  }

  return total;
}

function resolveInventoryItem(key, fallbackName) {
  const item = state.itemByKey.get(key);
  if (item) {
    return item;
  }

  return {
    name: fallbackName,
    categories: [],
    item_type: "",
  };
}

function isMeatLike(item) {
  const name = normalizeName(item.name);
  return name.includes("meat") || name.includes("jerky");
}

function isVegetableLike(item) {
  const name = normalizeName(item.name);
  const categories = normalizeList(item.categories || []);
  const itemType = normalizeName(item.item_type || "");
  const foodLike = categories.includes("food") || categories.includes("consumables") || itemType === "food";

  if (!foodLike) {
    return false;
  }

  if (name.includes("salt") || name.includes("water") || name.includes("meat") || name.includes("fish") || name.includes("egg")) {
    return false;
  }

  return true;
}

function isRationIngredient(item) {
  const name = normalizeName(item.name);
  const categories = normalizeList(item.categories || []);
  const itemType = normalizeName(item.item_type || "");
  const foodLike = categories.includes("food") || categories.includes("consumables") || itemType === "food";

  if (!foodLike) {
    return false;
  }

  return !name.includes("salt") && !name.includes("water");
}

function normalizeList(values) {
  return values.map((value) => normalizeName(value));
}

function normalizeName(value) {
  return value.toLowerCase().replace(/\s+/g, " ").trim();
}

function escapeHtml(value) {
  return String(value)
    .replaceAll("&", "&amp;")
    .replaceAll("<", "&lt;")
    .replaceAll(">", "&gt;")
    .replaceAll('"', "&quot;")
    .replaceAll("'", "&#39;");
}