const EURJPY = 182.85;

function mapsLink(q) {
  return `https://www.google.com/maps/search/?api=1&query=${encodeURIComponent(q)}`;
}
function jpyToEur(jpy) {
  return jpy / EURJPY;
}
function eurToJpy(eur) {
  return eur * EURJPY;
}
function formatJpy(n) {
  return "¥" + Number(n || 0).toLocaleString("it-IT", { maximumFractionDigits: 0 });
}
function formatEur(n) {
  return new Intl.NumberFormat("it-IT", { style: "currency", currency: "EUR" }).format(n || 0);
}

// Minimal “calendar” dataset (lorem ipsum placeholders)
const DAYS = [
  {
    id: "d01",
    dateLabel: "14 giugno",
    title: "Tokyo · Arrivo",
    city: "Tokyo",
    base: "Asakusa",
    summary: "Lorem ipsum dolor sit amet, consectetur adipiscing elit.",
    movements: [
      { time: "10:30", from: "Narita", to: "Asakusa", mode: "Train", mapsQuery: "Narita Airport to Asakusa" },
      { time: "15:00", from: "Asakusa", to: "Shibuya", mode: "Metro", mapsQuery: "Asakusa to Shibuya" },
    ],
    attractions: [
      { name: "Lorem Shrine", note: "Lorem ipsum dolor sit amet.", mapsQuery: "Meiji Jingu" },
      { name: "Ipsum Crossing", note: "Sed do eiusmod tempor.", mapsQuery: "Shibuya Crossing" },
    ],
    lunch: [
      { name: "Lorem Ramen", mapsQuery: "Ramen Asakusa" },
      { name: "Ipsum Sushi", mapsQuery: "Sushi Asakusa" },
    ],
    dinner: [
      { name: "Dolor Izakaya", mapsQuery: "Izakaya Shinjuku" },
      { name: "Sit Tempura", mapsQuery: "Tempura Shinjuku" },
    ],
  },
  {
    id: "d02",
    dateLabel: "15 giugno",
    title: "Tokyo · Tradizione",
    city: "Tokyo",
    base: "Asakusa",
    summary: "Ut enim ad minim veniam, quis nostrud exercitation ullamco.",
    movements: [
      { time: "09:00", from: "Asakusa", to: "Senso-ji", mode: "Walk", mapsQuery: "Senso-ji" },
      { time: "12:00", from: "Senso-ji", to: "Skytree", mode: "Walk", mapsQuery: "Tokyo Skytree" },
    ],
    attractions: [
      { name: "Senso-ji", note: "Lorem ipsum dolor sit amet.", mapsQuery: "Senso-ji" },
      { name: "Tokyo Skytree", note: "Consectetur adipiscing elit.", mapsQuery: "Tokyo Skytree" },
    ],
    lunch: [
      { name: "Lorem Bento", mapsQuery: "Tokyo Solamachi food" },
      { name: "Ipsum Udon", mapsQuery: "Udon Asakusa" },
    ],
    dinner: [
      { name: "Dolor Gyoza", mapsQuery: "Gyoza Akihabara" },
      { name: "Sit Soba", mapsQuery: "Soba Asakusa" },
    ],
  },
];

const elCalendar = document.getElementById("calendar");
const elDayView = document.getElementById("dayView");

function renderCalendar(selectedId) {
  elCalendar.innerHTML = DAYS.map((d) => {
    const active = d.id === selectedId ? " is-active" : "";
    return `
      <button class="cal-day${active}" data-id="${d.id}" type="button">
        <div class="cal-date">${d.dateLabel}</div>
        <div class="cal-title">${d.title}</div>
      </button>
    `;
  }).join("");

  elCalendar.querySelectorAll(".cal-day").forEach((b) => {
    b.addEventListener("click", () => {
      const id = b.getAttribute("data-id");
      renderDay(id);
      renderCalendar(id);
      location.hash = "#giorno";
    });
  });
}

function renderDay(dayId) {
  const day = DAYS.find((d) => d.id === dayId) || DAYS[0];

  const movements = day.movements
    .map(
      (m) => `
      <div class="trow">
        <div class="t">${m.time}</div>
        <div>
          <div class="p">${m.from} → ${m.to}</div>
          <div class="d">${m.mode} · Lorem ipsum dolor sit amet.</div>
        </div>
        <div><a class="btn ghost" target="_blank" href="${mapsLink(m.mapsQuery)}">Maps</a></div>
      </div>
    `
    )
    .join("");

  const attractions = day.attractions
    .map(
      (a) => `
      <li>
        <a class="placeLink" target="_blank" href="${mapsLink(a.mapsQuery)}">${a.name}</a>
        <div class="small">${a.note}</div>
      </li>
    `
    )
    .join("");

  const lunch = day.lunch
    .map((p) => `<li><a class="placeLink" target="_blank" href="${mapsLink(p.mapsQuery)}">${p.name}</a></li>`)
    .join("");

  const dinner = day.dinner
    .map((p) => `<li><a class="placeLink" target="_blank" href="${mapsLink(p.mapsQuery)}">${p.name}</a></li>`)
    .join("");

  elDayView.innerHTML = `
    <div class="kpis">
      <div class="kpi">
        <div class="label">Dove siete</div>
        <div class="value">${day.city} · ${day.base}</div>
      </div>
      <div class="kpi">
        <div class="label">Nota</div>
        <div class="value">${day.summary}</div>
      </div>
    </div>

    <div class="meal">
      <h4>Spostamenti</h4>
      <div class="timeline">${movements}</div>
    </div>

    <div class="meal">
      <h4>Attrazioni</h4>
      <ul>${attractions}</ul>
    </div>

    <div class="meal">
      <h4>Pranzo (suggeriti)</h4>
      <ul>${lunch}</ul>
    </div>

    <div class="meal">
      <h4>Cena (suggeriti)</h4>
      <ul>${dinner}</ul>
    </div>
  `;
}

async function apiFetch(path, options) {
  const res = await fetch(path, {
    headers: { "Content-Type": "application/json" },
    ...options,
  });
  if (!res.ok) {
    const text = await res.text();
    throw new Error(text || `HTTP ${res.status}`);
  }
  if (res.status === 204) return null;
  return res.json();
}

// -----------------
// TODO UI
// -----------------

const elTodoList = document.getElementById("todoList");
const elTodoNewText = document.getElementById("todoNewText");
const elTodoAddBtn = document.getElementById("todoAddBtn");

async function renderTodos() {
  const todos = await apiFetch("/api/todos");
  elTodoList.innerHTML = todos.length
    ? todos
        .map(
          (t) => `
        <div class="todo-item">
          <label class="todo-check">
            <input type="checkbox" data-id="${t.id}" ${t.done ? "checked" : ""} />
            <span>${t.text}</span>
          </label>
          <div class="todo-actions">
            <button class="btn ghost todo-edit" data-id="${t.id}" type="button">Modifica</button>
            <button class="btn ghost todo-del" data-id="${t.id}" type="button">Elimina</button>
          </div>
        </div>
      `
        )
        .join("")
    : `<div class="small" style="margin-top:12px">Nessuna voce. Lorem ipsum.</div>`;

  elTodoList.querySelectorAll("input[type=checkbox]").forEach((cb) => {
    cb.addEventListener("change", async () => {
      const id = cb.getAttribute("data-id");
      await apiFetch(`/api/todos/${id}`, { method: "PATCH", body: JSON.stringify({ done: cb.checked }) });
    });
  });

  elTodoList.querySelectorAll(".todo-del").forEach((b) => {
    b.addEventListener("click", async () => {
      const id = b.getAttribute("data-id");
      await apiFetch(`/api/todos/${id}`, { method: "DELETE" });
      await renderTodos();
    });
  });

  elTodoList.querySelectorAll(".todo-edit").forEach((b) => {
    b.addEventListener("click", async () => {
      const id = b.getAttribute("data-id");
      const current = b.closest(".todo-item").querySelector(".todo-check span").textContent;
      const next = prompt("Modifica testo", current);
      if (next === null) return;
      await apiFetch(`/api/todos/${id}`, { method: "PATCH", body: JSON.stringify({ text: next }) });
      await renderTodos();
    });
  });
}

elTodoAddBtn.addEventListener("click", async () => {
  const text = (elTodoNewText.value || "").trim();
  if (!text) return;
  await apiFetch("/api/todos", { method: "POST", body: JSON.stringify({ text }) });
  elTodoNewText.value = "";
  await renderTodos();
});

elTodoNewText.addEventListener("keydown", async (e) => {
  if (e.key === "Enter") {
    e.preventDefault();
    elTodoAddBtn.click();
  }
});

// -----------------
// EXPENSES UI
// -----------------

const elCostList = document.getElementById("costList");
const elCostDesc = document.getElementById("costDesc");
const elCostJpy = document.getElementById("costJpy");
const elCostEur = document.getElementById("costEur");
const elAddCostBtn = document.getElementById("addCostBtn");

async function renderExpenses() {
  const expenses = await apiFetch("/api/expenses");

  elCostList.innerHTML = expenses.length
    ? expenses
        .map(
          (c) => `
        <div class="cost-row">
          <div style="flex:1;min-width:0">
            <div class="p">${c.description}</div>
            <div class="small">${formatJpy(c.jpy)} · ${formatEur(c.eur)}</div>
          </div>
          <div class="todo-actions">
            <button class="btn ghost cost-edit" data-id="${c.id}" data-desc="${encodeURIComponent(
            c.description
          )}" data-jpy="${c.jpy}" data-eur="${c.eur}" type="button">Modifica</button>
            <button class="btn ghost cost-del" data-id="${c.id}" type="button">Elimina</button>
          </div>
        </div>
      `
        )
        .join("")
    : `<div class="small" style="margin-top:12px">Nessuna spesa inserita. Lorem ipsum.</div>`;

  const totalJpy = expenses.reduce((a, c) => a + Number(c.jpy || 0), 0);
  const totalEur = expenses.reduce((a, c) => a + Number(c.eur || 0), 0);
  document.getElementById("totalJpy").textContent = formatJpy(totalJpy);
  document.getElementById("totalEur").textContent = formatEur(totalEur);

  elCostList.querySelectorAll(".cost-del").forEach((b) => {
    b.addEventListener("click", async () => {
      const id = b.getAttribute("data-id");
      await apiFetch(`/api/expenses/${id}`, { method: "DELETE" });
      await renderExpenses();
    });
  });

  elCostList.querySelectorAll(".cost-edit").forEach((b) => {
    b.addEventListener("click", async () => {
      const id = b.getAttribute("data-id");
      const desc = decodeURIComponent(b.getAttribute("data-desc"));
      const jpy = Number(b.getAttribute("data-jpy"));
      const eur = Number(b.getAttribute("data-eur"));

      const nextDesc = prompt("Descrizione", desc);
      if (nextDesc === null) return;
      const nextJpyRaw = prompt("Importo JPY", String(jpy));
      if (nextJpyRaw === null) return;
      const nextJpy = Number(nextJpyRaw);
      if (!Number.isFinite(nextJpy) || nextJpy < 0) return;
      const nextEur = jpyToEur(nextJpy);

      await apiFetch(`/api/expenses/${id}`, {
        method: "PATCH",
        body: JSON.stringify({ description: nextDesc, jpy: nextJpy, eur: nextEur }),
      });
      await renderExpenses();
    });
  });
}

elAddCostBtn.addEventListener("click", async () => {
  const description = (elCostDesc.value || "").trim();
  const jpyRaw = elCostJpy.value;
  const eurRaw = elCostEur.value;

  if (!description) return;

  const jpyVal = Number(jpyRaw);
  const eurVal = Number(eurRaw);

  let jpy = 0;
  let eur = 0;

  if (jpyVal > 0) {
    jpy = jpyVal;
    eur = jpyToEur(jpyVal);
  } else if (eurVal > 0) {
    eur = eurVal;
    jpy = eurToJpy(eurVal);
  } else {
    return;
  }

  await apiFetch("/api/expenses", { method: "POST", body: JSON.stringify({ description, jpy, eur }) });

  elCostDesc.value = "";
  elCostJpy.value = "";
  elCostEur.value = "";

  await renderExpenses();
});

(function init() {
  document.getElementById("rate").textContent = String(EURJPY);
  renderCalendar(DAYS[0].id);
  renderDay(DAYS[0].id);
  renderTodos();
  renderExpenses();
})();