let allMeals = [];
let currentPlan = [];

document.addEventListener("DOMContentLoaded", () => {
  setupTabs();
  loadMeals();
  setupFilters();
  setupButtons();
});

function setupTabs() {
  document.querySelectorAll(".tab").forEach(tab => {
    tab.addEventListener("click", () => {
      document.querySelectorAll(".tab").forEach(t => t.classList.remove("active"));
      document.querySelectorAll(".tab-content").forEach(c => c.classList.remove("active"));
      tab.classList.add("active");
      document.getElementById(tab.dataset.tab).classList.add("active");
    });
  });
}

async function loadMeals() {
  try {
    const res = await fetch("/api/meals");
    allMeals = await res.json();
    renderMeals(allMeals);
    renderRecipes(allMeals);
  } catch (e) {
    console.error("Ошибка загрузки блюд:", e);
  }
}

function setupFilters() {
  document.querySelectorAll(".filter-btn").forEach(btn => {
    btn.addEventListener("click", () => {
      document.querySelectorAll(".filter-btn").forEach(b => b.classList.remove("active"));
      btn.classList.add("active");
      const type = btn.dataset.type;
      if (type === "all") {
        renderMeals(allMeals);
      } else {
        renderMeals(allMeals.filter(m => m.type === type));
      }
    });
  });
}

function setupButtons() {
  document.getElementById("btn-generate").addEventListener("click", generatePlan);
  document.getElementById("btn-export").addEventListener("click", exportToExcel);
}

function renderMeals(meals) {
  const container = document.getElementById("meals-list");
  if (meals.length === 0) {
    container.innerHTML = '<div class="empty-state"><p>Нет блюд</p></div>';
    return;
  }
  container.innerHTML = meals.map(m => `
    <div class="meal-card" onclick="showRecipe('${m.id}')">
      <span class="type-badge" data-type="${m.type}">${m.type}</span>
      <h4>${m.name}</h4>
      <div class="kbzu-row">
        <span class="kbzu-item"><strong>${m.calories}</strong> ккал</span>
        <span class="kbzu-item">Б: <strong>${m.protein}</strong>г</span>
        <span class="kbzu-item">Ж: <strong>${m.fat}</strong>г</span>
        <span class="kbzu-item">У: <strong>${m.carbs}</strong>г</span>
      </div>
      <div style="margin-top: 0.8rem; font-size: 0.85rem; color: #718096;">
        ⏱ ${m.time_min} мин | 🍽 ${m.servings} порц.
      </div>
    </div>
  `).join("");
}

function renderRecipes(meals) {
  const container = document.getElementById("recipes-list");
  container.innerHTML = meals.map(m => `
    <div class="recipe-card" onclick="showRecipe('${m.id}')">
      <span class="type-badge" data-type="${m.type}">${m.type}</span>
      <h4>${m.name}</h4>
      <div class="kbzu-row">
        <span class="kbzu-item"><strong>${m.calories}</strong> ккал</span>
        <span class="kbzu-item">🍽 ${m.servings} порц.</span>
      </div>
    </div>
  `).join("");
}

async function showRecipe(id) {
  const res = await fetch(`/api/meal/${id}`);
  const meal = await res.json();
  if (!meal) return;

  document.getElementById("recipe-detail").innerHTML = `
    <h3>${meal.name}</h3>
    <div class="detail-grid">
      <div class="ingredients-list">
        <h4>Ингредиенты (на ${meal.servings} порций)</h4>
        <ul>
          ${meal.ingredients.map(i => `<li>${i.name} — ${i.amount} ${i.unit}</li>`).join("")}
        </ul>
      </div>
      <div class="kbzu-table">
        <h4>КБЖУ на порцию</h4>
        <table>
          <tr><th>Калории</th><td><strong>${meal.calories}</strong> ккал</td></tr>
          <tr><th>Белки</th><td><strong>${meal.protein}</strong> г</td></tr>
          <tr><th>Жиры</th><td><strong>${meal.fat}</strong> г</td></tr>
          <tr><th>Углеводы</th><td><strong>${meal.carbs}</strong> г</td></tr>
        </table>
        <p style="margin-top: 1rem; color: #718096; font-size: 0.9rem;">
          ⏱ Время приготовления: <strong>${meal.time_min} мин</strong>
        </p>
      </div>
    </div>
  `;
  document.getElementById("recipe-detail").classList.add("active");
  document.getElementById("recipe-detail").scrollIntoView({ behavior: "smooth" });
}

async function generatePlan() {
  const btn = document.getElementById("btn-generate");
  btn.textContent = "⏳ Генерация...";
  btn.disabled = true;

  try {
    console.log("Генерация плана...");
    const res = await fetch("/api/generate-plan", { method: "POST" });
    console.log("Статус ответа:", res.status);
    if (!res.ok) {
      const errText = await res.text();
      throw new Error("Сервер вернул ошибку " + res.status + ": " + errText);
    }
    const result = await res.json();
    console.log("План получен:", result);
    currentPlan = result.plan;

    renderWeeklyTotals(result.weekly_totals);
    renderWeekPlan(result.plan);

    const shoppingRes = await fetch("/api/shopping-list", {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ plan: result.plan })
    });
    if (!shoppingRes.ok) {
      throw new Error("Список продуктов: ошибка " + shoppingRes.status);
    }
    const shopping = await shoppingRes.json();
    console.log("Список продуктов:", shopping);
    renderShoppingList(shopping);

    const timelineRes = await fetch("/api/timeline", {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ plan: result.plan })
    });
    if (!timelineRes.ok) {
      throw new Error("Хронология: ошибка " + timelineRes.status);
    }
    const timeline = await timelineRes.json();
    console.log("Хронология:", timeline);
    renderTimeline(timeline);

    btn.textContent = "🔄 Сгенерировать заново";
  } catch (e) {
    console.error("❌ Ошибка генерации:", e);
    alert("Ошибка: " + e.message);
    btn.textContent = "⚠️ Ошибка: " + e.message;
  }
  btn.disabled = false;
}

function renderWeeklyTotals(totals) {
  document.getElementById("weekly-totals").innerHTML = `
    <h3>📊 Итого за неделю (на 4 человек)</h3>
    <div class="totals-grid">
      <div class="total-item">
        <div class="value">${totals.calories.toLocaleString()}</div>
        <div class="label">ккал всего</div>
      </div>
      <div class="total-item">
        <div class="value">${totals.avg_daily_calories.toLocaleString()}</div>
        <div class="label">ккал в день (среднее)</div>
      </div>
      <div class="total-item">
        <div class="value">${totals.protein}г</div>
        <div class="label">Белки</div>
      </div>
      <div class="total-item">
        <div class="value">${totals.fat}г</div>
        <div class="label">Жиры</div>
      </div>
      <div class="total-item">
        <div class="value">${totals.carbs}г</div>
        <div class="label">Углеводы</div>
      </div>
      <div class="total-item">
        <div class="value">${totals.cost.toLocaleString()} ₸</div>
        <div class="label">Примерная стоимость</div>
      </div>
    </div>
  `;
}

function renderWeekPlan(plan) {
  const container = document.getElementById("week-plan");
  container.innerHTML = plan.map(day => `
    <div class="day-card">
      <h3>${day.day} <span class="date">${day.date}</span></h3>
      <div class="meal-row">
        <span class="meal-type">🌅 Завтрак</span>
        <span class="meal-name">${day.breakfast.name}</span>
        <span class="meal-kbzu">${day.breakfast.calories} ккал | Б:${day.breakfast.protein}г Ж:${day.breakfast.fat}г У:${day.breakfast.carbs}г</span>
      </div>
      <div class="meal-row">
        <span class="meal-type">☀️ Обед</span>
        <span class="meal-name">${day.lunch.name}</span>
        <span class="meal-kbzu">${day.lunch.calories} ккал | Б:${day.lunch.protein}г Ж:${day.lunch.fat}г У:${day.lunch.carbs}г</span>
      </div>
      <div class="meal-row">
        <span class="meal-type">🌙 Ужин</span>
        <span class="meal-name">${day.dinner.name}</span>
        <span class="meal-kbzu">${day.dinner.calories} ккал | Б:${day.dinner.protein}г Ж:${day.dinner.fat}г У:${day.dinner.carbs}г</span>
      </div>
      <div style="margin-top: 1rem; padding-top: 1rem; border-top: 2px solid #e2e8f0; display: flex; justify-content: space-between; align-items: center;">
        <strong style="color: #667eea;">Итого за день: ${day.daily_total.calories} ккал</strong>
        <span style="color: #718096; font-size: 0.9rem;">Б:${day.daily_total.protein}г | Ж:${day.daily_total.fat}г | У:${day.daily_total.carbs}г | ~${day.daily_total.cost} ₸</span>
      </div>
    </div>
  `).join("");
}

function renderShoppingList(shopping) {
  const container = document.getElementById("shopping-list");
  const summary = document.getElementById("shopping-summary");

  summary.innerHTML = `
    <h3>🛒 Список продуктов на неделю</h3>
    <div class="totals-grid">
      <div class="total-item">
        <div class="value">${shopping.total_cost.toLocaleString()} ₸</div>
        <div class="label">Общая стоимость</div>
      </div>
      <div class="total-item">
        <div class="value">${shopping.budget.toLocaleString()} ₸</div>
        <div class="label">Бюджет</div>
      </div>
      <div class="total-item">
        <div class="value" style="color: ${shopping.remaining >= 0 ? '#48bb78' : '#f56565'}">${shopping.remaining.toLocaleString()} ₸</div>
        <div class="label">Остаток</div>
      </div>
    </div>
  `;

  const byCategory = {};
  shopping.items.forEach(item => {
    if (!byCategory[item.category]) byCategory[item.category] = [];
    byCategory[item.category].push(item);
  });

  container.innerHTML = Object.entries(byCategory).map(([cat, items]) => `
    <div class="category-group">
      <h3>${cat}</h3>
      ${items.map(p => `
        <div class="product-item">
          <span class="name">${p.name}</span>
          <span class="amount">${p.amount >= 1000 ? (p.amount/1000).toFixed(2) + ' кг' : p.amount + ' г'}</span>
          <span class="cost">${p.cost.toLocaleString()} ₸</span>
        </div>
      `).join("")}
    </div>
  `).join("");
}

function renderTimeline(timeline) {
  const container = document.getElementById("timeline-list");
  container.innerHTML = timeline.map(item => `
    <div class="timeline-item">
      <span class="day">${item.day}</span>
      <span class="action">
        <strong>${item.action}</strong>
        <div class="details">${item.details}</div>
        ${item.ingredients ? `<div class="details" style="font-size: 0.8rem; color: #a0aec0;">📝 Продукты: ${item.ingredients.slice(0, 5).join(", ")}${item.ingredients.length > 5 ? "..." : ""}</div>` : ""}
      </span>
      <span class="time">⏱ ${item.time_min} мин</span>
    </div>
  `).join("");
}

function exportToExcel() {
  const shopping = document.getElementById("shopping-list");
  if (!shopping || shopping.children.length === 0) {
    alert("Сначала сгенерируйте план питания!");
    return;
  }

  let csv = "\uFEFF";
  csv += "Категория;Продукт;Количество;Стоимость (₸)\n";

  document.querySelectorAll(".category-group").forEach(group => {
    const category = group.querySelector("h3").textContent;
    group.querySelectorAll(".product-item").forEach(item => {
      const name = item.querySelector(".name").textContent;
      const amount = item.querySelector(".amount").textContent;
      const cost = item.querySelector(".cost").textContent.replace(" ₸", "");
      csv += `${category};${name};${amount};${cost}\n`;
    });
  });

  const blob = new Blob([csv], { type: "text/csv;charset=utf-8;" });
  const link = document.createElement("a");
  link.href = URL.createObjectURL(blob);
  link.download = "spisok_produktov.csv";
  link.click();
}

window.showRecipe = showRecipe;