/* ============================================================
   Подбор техники — render, state, navigation, submit
   ============================================================ */

const Podbor = (function () {
  const STORAGE_KEY = "zov-podbor-v1";
  const STEPS = ["intro", "categories", "context", "infra", "scenario", "brands", "summary"];

  let state = loadState();
  let root = null;
  let currentStep = "intro";

  function loadState() {
    try {
      const raw = localStorage.getItem(STORAGE_KEY);
      if (raw) return JSON.parse(raw);
    } catch (e) {}
    return defaultState();
  }

  function defaultState() {
    return {
      client_name: "",
      client_phone: "",
      address: "",
      budget_total: "",
      categories: [],   // ['fridge','hob',...]
      niches: {},       // { fridge:{w,h,d}, hob:{w,d}, oven:{w,h,d}, dw:{w,h,d} }
      budget_by_cat: {},// { fridge:80000, hob:50000, ... }
      infra: { stove: "", vent: "" },
      scenario: { family: "", cooking: "", techniques: [], guests: "" },
      brands: {},       // { fridge: {Bosch:'preferred', Liebherr:'preferred'}, ... }
      notes: "",
    };
  }

  function saveState() {
    try { localStorage.setItem(STORAGE_KEY, JSON.stringify(state)); } catch (e) {}
  }

  function update(patch) {
    state = { ...state, ...patch };
    saveState();
  }

  /* ===================== Render entry ===================== */

  function mount(container) {
    root = container;
    document.body.classList.remove("has-bottom-nav");
    const oldNav = document.getElementById("bottom-nav");
    if (oldNav) oldNav.remove();
    render();
  }

  function go(step) {
    if (!STEPS.includes(step)) return;
    currentStep = step;
    render();
    window.scrollTo({ top: 0, behavior: "smooth" });
    haptic && haptic("impact");
  }

  function render() {
    if (!root) return;
    root.innerHTML = "";
    root.appendChild(renderHeader());
    root.appendChild(renderProgress());
    const screen = el(`<div class="podbor-screen"></div>`);
    root.appendChild(screen);

    switch (currentStep) {
      case "intro":      screen.appendChild(renderIntro()); break;
      case "categories": screen.appendChild(renderCategories()); break;
      case "context":    screen.appendChild(renderContext()); break;
      case "infra":      screen.appendChild(renderInfra()); break;
      case "scenario":   screen.appendChild(renderScenario()); break;
      case "brands":     screen.appendChild(renderBrands()); break;
      case "summary":    screen.appendChild(renderSummary()); break;
    }
  }

  /* ===================== Header & progress ===================== */

  function renderHeader() {
    const h = el(`
      <header class="podbor-header">
        <button class="podbor-back" aria-label="Назад">${ICONS.arrow_left}</button>
        <div class="podbor-title">Подбор техники</div>
        <div style="width:28px"></div>
      </header>
    `);
    h.querySelector(".podbor-back").addEventListener("click", () => {
      const idx = STEPS.indexOf(currentStep);
      if (idx <= 0) {
        // Выход из подбора в главный экран кабинета
        location.hash = "";
        location.reload();
      } else {
        go(STEPS[idx - 1]);
      }
    });
    return h;
  }

  function renderProgress() {
    const idx = STEPS.indexOf(currentStep);
    const total = STEPS.length;
    const pct = Math.round(((idx + 1) / total) * 100);
    const labels = ["Старт", "Категории", "Контекст", "Инфра", "Сценарий", "Бренды", "Подбор"];
    return el(`
      <div class="podbor-progress">
        <div class="podbor-progress-bar"><div class="bar" style="width:${pct}%"></div></div>
        <div class="podbor-progress-meta">
          <span>${labels[idx]}</span><span class="num">${idx + 1}/${total}</span>
        </div>
      </div>
    `);
  }

  /* ===================== Step: intro ===================== */

  function renderIntro() {
    const node = el(`
      <section class="podbor-step">
        <h2 class="display-title">Подбор техники<br><span class="accent">для клиента</span></h2>
        <p class="lede">7 коротких шагов. Указываем категории, бюджет, инфраструктуру и предпочтения. Дальше AI сам соберёт предложение.</p>

        <div class="form-row">
          <label class="field">
            <span class="field-label">Клиент</span>
            <input type="text" data-bind="client_name" value="${state.client_name || ""}" placeholder="Например: А. Пестова">
          </label>
        </div>
        <div class="form-row two-col">
          <label class="field">
            <span class="field-label">Телефон</span>
            <input type="tel" data-bind="client_phone" value="${state.client_phone || ""}" placeholder="+7 ...">
          </label>
          <label class="field">
            <span class="field-label">Бюджет на технику, ₽</span>
            <input type="number" data-bind="budget_total" value="${state.budget_total || ""}" placeholder="например 350000">
          </label>
        </div>

        <div class="podbor-cta-row">
          <button class="btn-primary" data-go="categories">Начать</button>
        </div>
      </section>
    `);
    bindInputs(node);
    bindNav(node);
    return node;
  }

  /* ===================== Step: categories ===================== */

  function renderCategories() {
    const grid = PODBOR_CATEGORIES.map(c => `
      <button class="cat-card${state.categories.includes(c.key) ? " active" : ""}" data-cat="${c.key}">
        <div class="cat-icon">${ICONS[c.icon] || ""}</div>
        <div class="cat-label">${c.label}</div>
        ${state.categories.includes(c.key) ? `<div class="cat-check">${ICONS.check}</div>` : ""}
      </button>
    `).join("");

    const node = el(`
      <section class="podbor-step">
        <h2 class="display-title">Какую технику<br><span class="accent">подбираем?</span></h2>
        <p class="lede">Выберите все категории, что нужно подобрать клиенту.</p>
        <div class="cat-grid">${grid}</div>
        <div class="podbor-cta-row">
          <button class="btn-secondary" data-go="intro">Назад</button>
          <button class="btn-primary" data-go="context">Дальше</button>
        </div>
      </section>
    `);
    node.querySelectorAll(".cat-card").forEach(card => {
      card.addEventListener("click", () => {
        const cat = card.dataset.cat;
        const next = state.categories.includes(cat)
          ? state.categories.filter(x => x !== cat)
          : [...state.categories, cat];
        update({ categories: next });
        render();
      });
    });
    bindNav(node);
    return node;
  }

  /* ===================== Step: context (ниши + бюджет по категориям) ===================== */

  function renderContext() {
    const builtinCats = ["fridge", "hob", "oven", "dw"]; // встройка
    const niches = builtinCats.filter(c => state.categories.includes(c)).map(c => {
      const cat = PODBOR_CATEGORIES.find(x => x.key === c);
      const n = state.niches[c] || {};
      return `
        <div class="niche-row">
          <div class="niche-label">${cat.label}</div>
          <div class="niche-inputs">
            <input type="number" data-niche="${c}.w" value="${n.w || ""}" placeholder="Ш, мм">
            <input type="number" data-niche="${c}.h" value="${n.h || ""}" placeholder="В, мм">
            <input type="number" data-niche="${c}.d" value="${n.d || ""}" placeholder="Г, мм">
          </div>
        </div>
      `;
    }).join("");

    const budgets = state.categories.map(c => {
      const cat = PODBOR_CATEGORIES.find(x => x.key === c);
      const v = state.budget_by_cat[c] || "";
      return `
        <label class="field-inline">
          <span>${cat.label}</span>
          <input type="number" data-budget="${c}" value="${v}" placeholder="₽">
        </label>
      `;
    }).join("");

    const node = el(`
      <section class="podbor-step">
        <h2 class="display-title">Размеры<br><span class="accent">и бюджет</span></h2>
        <p class="lede">Если планируется встройка — укажите размеры ниш. Бюджет по категориям помогает AI распределить деньги.</p>

        ${niches ? `
          <div class="block">
            <div class="block-head">Ниши под встройку, мм</div>
            <div class="niche-list">${niches}</div>
          </div>
        ` : ""}

        ${budgets ? `
          <div class="block">
            <div class="block-head">Бюджет по категориям, ₽</div>
            <div class="budget-list">${budgets}</div>
          </div>
        ` : ""}

        <div class="podbor-cta-row">
          <button class="btn-secondary" data-go="categories">Назад</button>
          <button class="btn-primary" data-go="infra">Дальше</button>
        </div>
      </section>
    `);
    node.querySelectorAll("[data-niche]").forEach(inp => {
      inp.addEventListener("input", e => {
        const [cat, dim] = e.target.dataset.niche.split(".");
        const next = { ...state.niches, [cat]: { ...(state.niches[cat] || {}), [dim]: e.target.value } };
        update({ niches: next });
      });
    });
    node.querySelectorAll("[data-budget]").forEach(inp => {
      inp.addEventListener("input", e => {
        const cat = e.target.dataset.budget;
        const next = { ...state.budget_by_cat, [cat]: e.target.value };
        update({ budget_by_cat: next });
      });
    });
    bindNav(node);
    return node;
  }

  /* ===================== Step: infra ===================== */

  function renderInfra() {
    const node = el(`
      <section class="podbor-step">
        <h2 class="display-title">Инфраструктура<br><span class="accent">кухни</span></h2>
        <p class="lede">Газ или электрика — главный вопрос для варочной. Шахта вентиляции — для вытяжки.</p>
        <div class="block">
          <div class="block-head">Подключение варочной</div>
          <div class="opt-list">
            ${PODBOR_INFRA.stove.map(o => `
              <button class="opt${state.infra.stove === o.key ? " on" : ""}" data-infra="stove" data-val="${o.key}">${o.label}</button>
            `).join("")}
          </div>
        </div>
        <div class="block">
          <div class="block-head">Вентиляция для вытяжки</div>
          <div class="opt-list">
            ${PODBOR_INFRA.vent.map(o => `
              <button class="opt${state.infra.vent === o.key ? " on" : ""}" data-infra="vent" data-val="${o.key}">${o.label}</button>
            `).join("")}
          </div>
        </div>
        <div class="podbor-cta-row">
          <button class="btn-secondary" data-go="context">Назад</button>
          <button class="btn-primary" data-go="scenario">Дальше</button>
        </div>
      </section>
    `);
    node.querySelectorAll("[data-infra]").forEach(b => {
      b.addEventListener("click", () => {
        update({ infra: { ...state.infra, [b.dataset.infra]: b.dataset.val } });
        render();
      });
    });
    bindNav(node);
    return node;
  }

  /* ===================== Step: scenario ===================== */

  function renderScenario() {
    const node = el(`
      <section class="podbor-step">
        <h2 class="display-title">Сценарий<br><span class="accent">использования</span></h2>
        <p class="lede">Семья с детьми готовит иначе, чем пара. AI учтёт это в подборе.</p>

        <div class="block">
          <div class="block-head">Состав семьи</div>
          <div class="opt-list">
            ${PODBOR_FAMILY.map(o => `
              <button class="opt${state.scenario.family === o.key ? " on" : ""}" data-scenario="family" data-val="${o.key}">${o.label}</button>
            `).join("")}
          </div>
        </div>

        <div class="block">
          <div class="block-head">Частота готовки</div>
          <div class="opt-list">
            ${PODBOR_COOKING.map(o => `
              <button class="opt${state.scenario.cooking === o.key ? " on" : ""}" data-scenario="cooking" data-val="${o.key}">${o.label}</button>
            `).join("")}
          </div>
        </div>

        <div class="block">
          <div class="block-head">Любимые техники приготовления</div>
          <div class="opt-list">
            ${PODBOR_TECHNIQUES.map(o => `
              <button class="opt${(state.scenario.techniques || []).includes(o.key) ? " on" : ""}" data-tech="${o.key}">${o.label}</button>
            `).join("")}
          </div>
          <div class="hint">Можно несколько</div>
        </div>

        <div class="podbor-cta-row">
          <button class="btn-secondary" data-go="infra">Назад</button>
          <button class="btn-primary" data-go="brands">Дальше</button>
        </div>
      </section>
    `);
    node.querySelectorAll("[data-scenario]").forEach(b => {
      b.addEventListener("click", () => {
        update({ scenario: { ...state.scenario, [b.dataset.scenario]: b.dataset.val } });
        render();
      });
    });
    node.querySelectorAll("[data-tech]").forEach(b => {
      b.addEventListener("click", () => {
        const cur = state.scenario.techniques || [];
        const key = b.dataset.tech;
        const next = cur.includes(key) ? cur.filter(x => x !== key) : [...cur, key];
        update({ scenario: { ...state.scenario, techniques: next } });
        render();
      });
    });
    bindNav(node);
    return node;
  }

  /* ===================== Step: brands ===================== */

  function renderBrands() {
    if (!state.categories.length) {
      return el(`<section class="podbor-step"><div class="empty">Сначала выберите категории.</div></section>`);
    }
    const blocks = state.categories.map(catKey => {
      const cat = PODBOR_CATEGORIES.find(x => x.key === catKey);
      const brands = PODBOR_BRANDS[catKey] || { premium: [], middle: [], budget: [] };
      const catState = state.brands[catKey] || {};
      const tierBlock = (tier) => `
        <div class="tier-row">
          <div class="tier-label">${PODBOR_BUDGET_TIERS.find(t => t.key === tier).label}</div>
          <div class="brand-chips">
            ${(brands[tier] || []).map(b => {
              const status = catState[b] || "none";
              return `<button class="chip status-${status}" data-cat="${catKey}" data-brand="${b}">${b}</button>`;
            }).join("")}
          </div>
        </div>
      `;
      return `
        <div class="block">
          <div class="block-head">${cat.label}</div>
          <div class="hint">★ Тап — предпочтительно · ✓ Двойной — допустимо · — Третий — снять</div>
          ${tierBlock("premium")}${tierBlock("middle")}${tierBlock("budget")}
        </div>
      `;
    }).join("");

    const node = el(`
      <section class="podbor-step">
        <h2 class="display-title">Бренды<br><span class="accent">по категориям</span></h2>
        <p class="lede">Какие марки уважаете, какие — допустимы. AI сначала пробует preferred.</p>
        ${blocks}
        <div class="podbor-cta-row">
          <button class="btn-secondary" data-go="scenario">Назад</button>
          <button class="btn-primary" data-go="summary">Дальше</button>
        </div>
      </section>
    `);
    node.querySelectorAll(".chip[data-brand]").forEach(c => {
      c.addEventListener("click", () => {
        const catKey = c.dataset.cat, brand = c.dataset.brand;
        const cur = (state.brands[catKey] || {})[brand] || "none";
        const nextStatus = cur === "none" ? "preferred" : cur === "preferred" ? "acceptable" : "none";
        const catBrands = { ...(state.brands[catKey] || {}) };
        if (nextStatus === "none") delete catBrands[brand];
        else catBrands[brand] = nextStatus;
        update({ brands: { ...state.brands, [catKey]: catBrands } });
        render();
      });
    });
    bindNav(node);
    return node;
  }

  /* ===================== Step: summary + submit ===================== */

  function renderSummary() {
    const node = el(`
      <section class="podbor-step">
        <h2 class="display-title">Готово<br><span class="accent">к подбору</span></h2>
        <p class="lede">Проверьте и отправьте — AI вернёт предложение в чат с ботом.</p>
        <div class="block summary-block">
          <div class="kv"><span>Клиент</span><strong>${state.client_name || "—"}</strong></div>
          <div class="kv"><span>Бюджет</span><strong>${state.budget_total ? state.budget_total + " ₽" : "—"}</strong></div>
          <div class="kv"><span>Категорий</span><strong>${state.categories.length}</strong></div>
          <div class="kv"><span>Семья</span><strong>${PODBOR_FAMILY.find(f => f.key === state.scenario.family)?.label || "—"}</strong></div>
          <div class="kv"><span>Готовка</span><strong>${PODBOR_COOKING.find(f => f.key === state.scenario.cooking)?.label || "—"}</strong></div>
          <div class="kv"><span>Подключение</span><strong>${PODBOR_INFRA.stove.find(f => f.key === state.infra.stove)?.label || "—"}</strong></div>
        </div>

        <label class="field">
          <span class="field-label">Дополнительные пожелания</span>
          <textarea data-bind="notes" rows="3" placeholder="Что-то особенное от клиента?">${state.notes || ""}</textarea>
        </label>

        <div class="podbor-cta-row">
          <button class="btn-secondary" data-go="brands">Назад</button>
          <button class="btn-primary" id="submitBtn">Отправить · AI подберёт</button>
        </div>

        <div id="submitResult" class="submit-result"></div>
      </section>
    `);
    bindInputs(node);
    bindNav(node);
    node.querySelector("#submitBtn").addEventListener("click", () => onSubmit(node));
    return node;
  }

  /* ===================== Submit ===================== */

  async function onSubmit(node) {
    const btn = node.querySelector("#submitBtn");
    const result = node.querySelector("#submitResult");
    btn.disabled = true;
    btn.innerHTML = '<span class="spinner-inline"></span> AI думает...';
    result.innerHTML = "";

    if (!BACKEND_URL) {
      result.innerHTML = `<div class="error">BACKEND_URL не настроен (dev-режим).</div>`;
      btn.disabled = false; btn.textContent = "Отправить · AI подберёт"; return;
    }

    try {
      const res = await fetch(`${BACKEND_URL}?path=podbor`, {
        method: "POST",
        body: JSON.stringify({
          initData: tg?.initData || "",
          checklist: state,
          client_name: state.client_name,
        }),
      });
      const data = await res.json();
      if (data.error) {
        result.innerHTML = `<div class="error">Ошибка: ${data.error}</div>`;
      } else {
        result.innerHTML = `
          <div class="success">
            <div class="success-icon">${ICONS.check}</div>
            <div>
              <div class="success-title">Подбор отправлен в чат бота</div>
              <div class="success-sub">Лид #${(data.id || "").slice(0, 6)} · откройте Telegram</div>
            </div>
          </div>
        `;
        haptic && haptic("success");
      }
    } catch (e) {
      result.innerHTML = `<div class="error">Сеть: ${e.message}</div>`;
    }
    btn.disabled = false;
    btn.textContent = "Отправить ещё раз";
  }

  /* ===================== Helpers ===================== */

  function bindInputs(node) {
    node.querySelectorAll("[data-bind]").forEach(inp => {
      inp.addEventListener("input", e => {
        update({ [e.target.dataset.bind]: e.target.value });
      });
    });
  }

  function bindNav(node) {
    node.querySelectorAll("[data-go]").forEach(b => {
      b.addEventListener("click", () => go(b.dataset.go));
    });
  }

  return { mount, go, getState: () => state, reset: () => { state = defaultState(); saveState(); render(); } };
})();