// services.js — page "Services" : répartition des coûts par service, tous
// tenants/providers confondus, avec sélecteur de période (7j/30j/1 an) et
// détail par tenant au clic sur un service.

let currentRange = 30;
let currentProvider = "all";
let currentServices = [];
let currentTotal = 0;

const SORT_COLUMNS = [
  { key: "service_name", label: "Service", numeric: false },
  { key: "amount", label: "Montant", numeric: true },
  { key: "pct", label: "Part", numeric: true },
];
let sortColumn = "amount";
let sortDirection = "desc";

async function loadServices(range, provider) {
  const params = new URLSearchParams({ range });
  if (provider !== "all") params.set("provider", provider);
  const res = await fetch(`/api/services?${params}`);
  if (!res.ok) throw new Error(`API services: HTTP ${res.status}`);
  return res.json();
}

function periodTitle(data) {
  if (data.mode === "monthly") return "12 derniers mois";
  return rangeLabel(data.range_days);
}

function sortedServices() {
  const sorted = [...currentServices];
  sorted.sort((a, b) => {
    const cmp =
      sortColumn === "service_name"
        ? a.service_name.localeCompare(b.service_name, "fr", { sensitivity: "base" })
        : a[sortColumn] - b[sortColumn];
    return sortDirection === "asc" ? cmp : -cmp;
  });
  return sorted;
}

function sortIndicator(column) {
  if (sortColumn !== column) return "";
  return sortDirection === "asc" ? " ↑" : " ↓";
}

function renderServicesTable(data) {
  document.getElementById("services-period-title").textContent = periodTitle(data);
  currentServices = data.services;
  currentTotal = data.total;

  const wrap = document.getElementById("services-table-wrap");

  if (currentServices.length === 0) {
    wrap.innerHTML = `<div class="empty-state">Aucune donnée de coût sur cette période. Lance <code>collect.py</code> ou <code>import_historical.py</code> pour peupler le dashboard.</div>`;
    return;
  }

  renderServicesTableRows();
}

function renderServicesTableRows() {
  const wrap = document.getElementById("services-table-wrap");
  const sorted = sortedServices();

  const headerCells = SORT_COLUMNS.map((col) => {
    const classes = ["sortable"];
    if (col.numeric) classes.push("num");
    if (sortColumn === col.key) classes.push(`sorted-${sortDirection}`);
    return `<th class="${classes.join(" ")}" data-sort="${col.key}">${col.label}${sortIndicator(col.key)}</th>`;
  }).join("");

  const rows = sorted
    .map(
      (s) => `
      <tr class="clickable" data-service="${escapeHtml(s.service_name)}" title="Voir le détail par tenant">
        <td>${escapeHtml(s.service_name)}</td>
        <td class="num">${formatEUR(s.amount)}</td>
        <td class="num">${s.pct.toFixed(1)} %</td>
      </tr>`
    )
    .join("");

  wrap.innerHTML = `
    <table class="data-table">
      <thead><tr>${headerCells}</tr></thead>
      <tbody>${rows}</tbody>
      <tfoot>
        <tr>
          <td><strong>Total</strong></td>
          <td class="num"><strong>${formatEUR(currentTotal)}</strong></td>
          <td class="num"></td>
        </tr>
      </tfoot>
    </table>`;

  wrap.querySelectorAll("tr.clickable").forEach((tr) => {
    tr.addEventListener("click", () => openTenantDrawer(tr.dataset.service));
  });

  wrap.querySelectorAll("th.sortable").forEach((th) => {
    th.addEventListener("click", () => {
      const column = th.dataset.sort;
      if (sortColumn === column) {
        sortDirection = sortDirection === "asc" ? "desc" : "asc";
      } else {
        sortColumn = column;
        sortDirection = column === "service_name" ? "asc" : "desc";
      }
      renderServicesTableRows();
    });
  });
}

async function reloadServices() {
  try {
    const data = await loadServices(currentRange, currentProvider);
    renderServicesTable(data);
  } catch (e) {
    document.getElementById("error-banner").innerHTML = `
      <div class="banner error"><strong>Erreur de chargement</strong> : ${escapeHtml(e.message)}</div>`;
  }
}

function setupRangeToggle() {
  const buttons = document.querySelectorAll("#range-toggle button");
  buttons.forEach((btn) => {
    btn.classList.toggle("active", Number(btn.dataset.range) === currentRange);
    btn.addEventListener("click", () => {
      currentRange = Number(btn.dataset.range);
      buttons.forEach((b) => b.classList.toggle("active", b === btn));
      reloadServices();
    });
  });
}

function setupProviderToggle() {
  const buttons = document.querySelectorAll("#provider-toggle button");
  buttons.forEach((btn) => {
    btn.classList.toggle("active", btn.dataset.provider === currentProvider);
    btn.addEventListener("click", () => {
      currentProvider = btn.dataset.provider;
      buttons.forEach((b) => b.classList.toggle("active", b === btn));
      reloadServices();
    });
  });
}

// --- Drawer : détail par tenant d'un service ----------------------------

function openTenantDrawer(serviceName) {
  document.getElementById("drawer-title").textContent = serviceName;
  document.getElementById("drawer-sub").textContent = "Chargement…";
  document.getElementById("drawer-body").innerHTML = `<div class="skeleton">Chargement…</div>`;
  document.getElementById("tenant-drawer").classList.add("open");
  document.getElementById("tenant-drawer").setAttribute("aria-hidden", "false");
  document.getElementById("drawer-backdrop").classList.add("open");

  const params = new URLSearchParams({ range: currentRange });
  if (currentProvider !== "all") params.set("provider", currentProvider);

  fetch(`/api/services/${encodeURIComponent(serviceName)}/tenants?${params}`)
    .then((res) => {
      if (!res.ok) throw new Error(`HTTP ${res.status}`);
      return res.json();
    })
    .then((data) => renderDrawerContent(data))
    .catch((e) => {
      document.getElementById("drawer-sub").textContent = "";
      document.getElementById("drawer-body").innerHTML =
        `<div class="banner error"><strong>Erreur de chargement</strong> : ${escapeHtml(e.message)}</div>`;
    });
}

function renderDrawerContent(data) {
  const subEl = document.getElementById("drawer-sub");
  const bodyEl = document.getElementById("drawer-body");

  subEl.textContent = data.mode === "monthly" ? "12 derniers mois" : rangeLabel(data.range_days);

  if (!data.tenants.length) {
    bodyEl.innerHTML = `<div class="empty-state">Aucun tenant n'a de coût sur ce service pour cette période.</div>`;
    return;
  }

  bodyEl.innerHTML = data.tenants
    .map(
      (t) => `
      <div class="resource-row clickable" data-provider="${t.provider}" data-name="${escapeHtml(t.tenant_name)}">
        <div>
          <div class="resource-name">
            <span class="provider-badge ${t.provider}">${providerLabel(t.provider)}</span>
            ${escapeHtml(t.tenant_name)}
          </div>
          <div class="resource-pct">${t.pct.toFixed(1)} %</div>
        </div>
        <div class="resource-amount">${formatEUR(t.amount)}</div>
      </div>`
    )
    .join("");

  bodyEl.querySelectorAll(".resource-row.clickable").forEach((row) => {
    row.addEventListener("click", () => {
      window.location.href = `/tenant/${row.dataset.provider}/${encodeURIComponent(row.dataset.name)}`;
    });
  });
}

function closeTenantDrawer() {
  document.getElementById("tenant-drawer").classList.remove("open");
  document.getElementById("tenant-drawer").setAttribute("aria-hidden", "true");
  document.getElementById("drawer-backdrop").classList.remove("open");
}

function setupDrawer() {
  document.getElementById("drawer-close").addEventListener("click", closeTenantDrawer);
  document.getElementById("drawer-backdrop").addEventListener("click", closeTenantDrawer);
  document.addEventListener("keydown", (e) => {
    if (e.key === "Escape") closeTenantDrawer();
  });
}

async function init() {
  try {
    const data = await loadServices(currentRange, currentProvider);
    renderServicesTable(data);
    setupRangeToggle();
    setupProviderToggle();
    setupDrawer();
  } catch (e) {
    document.getElementById("error-banner").innerHTML = `
      <div class="banner error"><strong>Erreur de chargement</strong> : ${escapeHtml(e.message)}</div>`;
    document.getElementById("services-table-wrap").innerHTML = "";
  }
}

init();