<script lang="ts">
  import { onMount } from 'svelte';
  import { ShoppingCart } from 'lucide-svelte';
  import type { ShoppingListSnapshot } from '$lib/server/shopping/repository';
  import ShoppingListRow from '$lib/components/ShoppingListRow.svelte';
  import ShoppingCartChip from '$lib/components/ShoppingCartChip.svelte';
  import type { ShoppingListRow as Row } from '$lib/server/shopping/repository';
  import { shoppingCartStore } from '$lib/client/shopping-cart.svelte';
  import { confirmAction } from '$lib/client/confirm.svelte';

  let snapshot = $state<ShoppingListSnapshot>({ recipes: [], rows: [], uncheckedCount: 0 });
  let loading = $state(true);
  const hasChecked = $derived(snapshot.rows.some((r) => r.checked === 1));

  async function load() {
    loading = true;
    try {
      const res = await fetch('/api/shopping-list');
      snapshot = await res.json();
    } finally {
      loading = false;
    }
  }

  async function onToggleRow(row: Row, next: boolean) {
    const method = next ? 'POST' : 'DELETE';
    await fetch('/api/shopping-list/check', {
      method,
      headers: { 'content-type': 'application/json' },
      body: JSON.stringify({ name_key: row.name_key, unit_key: row.unit_key })
    });
    await load();
    void shoppingCartStore.refresh();
  }

  async function onServingsChange(recipeId: number, servings: number) {
    await fetch(`/api/shopping-list/recipe/${recipeId}`, {
      method: 'PATCH',
      headers: { 'content-type': 'application/json' },
      body: JSON.stringify({ servings })
    });
    await load();
    void shoppingCartStore.refresh();
  }

  async function onRemoveRecipe(recipeId: number) {
    await fetch(`/api/shopping-list/recipe/${recipeId}`, { method: 'DELETE' });
    await load();
    void shoppingCartStore.refresh();
  }

  async function clearChecked() {
    await fetch('/api/shopping-list/checked', { method: 'DELETE' });
    await load();
    void shoppingCartStore.refresh();
  }

  async function clearAll() {
    const ok = await confirmAction({
      title: 'Einkaufsliste leeren?',
      message: 'Alle Rezepte und abgehakten Zutaten werden entfernt. Das lässt sich nicht rückgängig machen.',
      confirmLabel: 'Leeren',
      destructive: true
    });
    if (!ok) return;
    await fetch('/api/shopping-list', { method: 'DELETE' });
    await load();
    void shoppingCartStore.refresh();
  }

  onMount(load);
</script>

<header class="head">
  <h1>Einkaufsliste</h1>
  {#if snapshot.recipes.length > 0}
    <p class="sub">
      {snapshot.uncheckedCount} noch zu besorgen · {snapshot.recipes.length} Rezept{snapshot.recipes.length === 1 ? '' : 'e'} im Wagen
    </p>
  {/if}
</header>

{#if loading}
  <p class="muted">Lädt …</p>
{:else if snapshot.recipes.length === 0}
  <section class="empty">
    <div class="big"><ShoppingCart size={48} strokeWidth={1.5} /></div>
    <p>Einkaufswagen ist leer.</p>
    <p class="hint">Lege Rezepte auf der Wunschliste in den Wagen, um sie hier zu sehen.</p>
  </section>
{:else}
  <div class="chips">
    {#each snapshot.recipes as r (r.recipe_id)}
      <ShoppingCartChip recipe={r} {onServingsChange} onRemove={onRemoveRecipe} />
    {/each}
  </div>
  <ul class="list">
    {#each snapshot.rows as row (row.name_key + '|' + row.unit_key)}
      <li>
        <ShoppingListRow {row} onToggle={onToggleRow} />
      </li>
    {/each}
  </ul>
  <div class="footer">
    {#if hasChecked}
      <button class="btn secondary" onclick={clearChecked}>Erledigte entfernen</button>
    {/if}
    <button class="btn destructive" onclick={clearAll}>Liste leeren</button>
  </div>
{/if}

<style>
  .head { padding: 1.25rem 0 0.5rem; }
  .head h1 { margin: 0; font-size: 1.6rem; color: #2b6a3d; }
  .sub { margin: 0.2rem 0 0; color: #666; }
  .muted { color: #888; text-align: center; padding: 2rem 0; }
  .empty { text-align: center; padding: 3rem 1rem; }
  .big { color: #8fb097; display: inline-flex; margin: 0 0 0.5rem; }
  .hint { color: #888; font-size: 0.9rem; }
  .list {
    list-style: none;
    padding: 0;
    margin: 0.75rem 0;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
  }
  .chips {
    display: flex;
    gap: 0.5rem;
    overflow-x: auto;
    padding: 0.5rem 0;
    margin: 0.5rem 0;
    -webkit-overflow-scrolling: touch;
  }
  .footer {
    position: sticky;
    bottom: 0;
    background: #f4f8f5;
    padding: 0.75rem 0;
    display: flex;
    gap: 0.5rem;
    justify-content: flex-end;
    margin-top: 1rem;
    border-top: 1px solid #e4eae7;
  }
  .btn {
    padding: 0.6rem 1rem;
    border-radius: 10px;
    border: 1px solid #cfd9d1;
    background: white;
    cursor: pointer;
    font-family: inherit;
    font-size: 0.9rem;
    min-height: 44px;
  }
  .btn.secondary { color: #2b6a3d; border-color: #b7d6c2; }
  .btn.destructive { color: #c53030; border-color: #f1b4b4; }
  .btn.destructive:hover { background: #fdf3f3; }
</style>
