const $ = (sel) => document.querySelector(sel);
const $$ = (sel) => Array.from(document.querySelectorAll(sel));

function badgeClass(sev) {
  const s = (sev || "").toLowerCase();
  if (["ok", "info", "low"].includes(s)) return "good";
  if (["medium", "warn", "warning"].includes(s)) return "warn";
  if (["high", "critical", "bad"].includes(s)) return "bad";
  return "";
}

function fmtTime(ts) {
  if (!ts) return "—";
  try {
    if (typeof ts === "number") return new Date(ts * 1000).toLocaleString();
    return new Date(ts).toLocaleString();
  } catch {
    return String(ts);
  }
}

function toast(msg) {
  const t = $("#toast");
  t.textContent = msg;
  t.classList.add("show");
  setTimeout(() => t.classList.remove("show"), 3500);
}

async function api(path, opts) {
  const res = await fetch(path, opts);
  const ct = res.headers.get("content-type") || "";
  const data = ct.includes("application/json") ? await res.json() : await res.text();
  return { ok: res.ok, status: res.status, data };
}

let state = {
  view: "dashboard",
  reports: [],
  selected: null,
};

function setView(v) {
  state.view = v;
  $$(".nav-item").forEach((a) => a.classList.toggle("active", a.dataset.view === v));
  $("#view-dashboard").classList.toggle("hidden", v !== "dashboard");
  $("#view-reports").classList.toggle("hidden", v !== "reports");
  $("#view-settings").classList.toggle("hidden", v !== "settings");

  if (v === "dashboard") {
    $("#page-title").textContent = "Dashboard";
    $("#page-sub").textContent = "Обзор состояния и последние отчёты";
  }
  if (v === "reports") {
    $("#page-title").textContent = "Reports";
    $("#page-sub").textContent = "Просмотр отчётов и применение действий (по согласию)";
  }
  if (v === "settings") {
    $("#page-title").textContent = "Settings";
    $("#page-sub").textContent = "Локальные параметры интерфейса";
  }
}

function renderTable(el, rows, { limit = null } = {}) {
  const r = limit ? rows.slice(0, limit) : rows;
  const header = `
    <div class="row header">
      <div>Summary</div>
      <div>Severity</div>
      <div>Updated</div>
      <div></div>
    </div>
  `;

  const body = r
    .map((it) => {
      const cls = badgeClass(it.severity);
      return `
        <div class="row clickable" data-id="${it.id}">
          <div>${escapeHtml(it.summary || "(no summary)")}</div>
          <div><span class="badge ${cls}">${escapeHtml(it.severity || "unknown")}</span></div>
          <div>${escapeHtml(fmtTime(it.created_utc || it.mtime))}</div>
          <div style="text-align:right;"><span class="pill">open</span></div>
        </div>
      `;
    })
    .join("");

  el.innerHTML = header + body;
  el.querySelectorAll(".row.clickable").forEach((row) => {
    row.addEventListener("click", () => openReport(row.dataset.id));
  });
}

function escapeHtml(s) {
  return String(s)
    .replaceAll("&", "&amp;")
    .replaceAll("<", "&lt;")
    .replaceAll(">", "&gt;")
    .replaceAll('"', "&quot;")
    .replaceAll("'", "&#039;");
}

async function refresh() {
  const h = await api("/api/health");
  if (h.ok) {
    $("#health-pill").textContent = "UI: OK";
    $("#status-value").textContent = "Protected";
    $("#status-hint").textContent = "local UI service running";
  } else {
    $("#health-pill").textContent = "UI: error";
    $("#status-value").textContent = "Degraded";
    $("#status-hint").textContent = "health check failed";
  }

  const r = await api("/api/reports");
  if (r.ok) {
    state.reports = r.data.reports || [];
    $("#reports-count").textContent = String(state.reports.length);
    renderTable($("#latest-table"), state.reports, { limit: 6 });
    renderTable($("#reports-table"), state.reports);
  } else {
    toast("Failed to load reports");
  }
}

async function openReport(reportId) {
  const p = await api(`/api/reports/${encodeURIComponent(reportId)}`);
  if (!p.ok) {
    toast("Report not found");
    return;
  }
  const report = p.data.report;
  state.selected = { id: reportId, report };

  $("#report-details").classList.remove("hidden");
  $("#details-title").textContent = `Report: ${reportId}`;
  $("#details-sub").textContent = "Read-only details";
  $("#details-summary").textContent = report.summary || "—";

  const sev = report.severity || "unknown";
  const cls = badgeClass(sev);
  const badge = $("#details-severity");
  badge.textContent = sev;
  badge.className = `badge ${cls}`;

  $("#details-created").textContent = fmtTime(report.created_utc || "—");
  $("#raw").textContent = JSON.stringify(report, null, 2);

  const fixesEl = $("#fixes");
  fixesEl.classList.add("fixes");
  const fixes = report.suggested_fixes || [];
  if (!fixes.length) {
    fixesEl.innerHTML = `<div class="muted" style="padding:12px;">No suggested fixes</div>`;
  } else {
    fixesEl.innerHTML = fixes
      .map((f) => {
        return `
          <div class="fix">
            <div class="fix-title">${escapeHtml(f.title || f.id || "Fix")}</div>
            <div class="fix-desc">${escapeHtml(f.description || "")}</div>
            <div class="fix-actions">
              <button class="btn" data-fix="${escapeHtml(f.id || "")}">Apply…</button>
              <span class="pill">consent</span>
            </div>
          </div>
        `;
      })
      .join("");

    fixesEl.querySelectorAll("button[data-fix]").forEach((b) => {
      b.addEventListener("click", () => applyFix(b.dataset.fix));
    });
  }
}

async function applyFix(fixId) {
  if (!state.selected) return;
  const reportId = state.selected.id;

  const confirm1 = window.confirm(
    `Apply fix '${fixId}' for report '${reportId}'?\n\nThis action requires explicit operator confirmation.`
  );
  if (!confirm1) return;

  const res = await api("/api/apply-fix", {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({ report_id: reportId, fix_id: fixId, confirm: true }),
  });

  if (res.ok) {
    toast("Fix applied");
  } else {
    if (res.status === 501) {
      toast("Fix runner not implemented yet (MVP UI only)");
      return;
    }
    if (res.status === 409) {
      toast("Confirmation required");
      return;
    }
    toast("Failed to apply fix");
  }
}

function bindEvents() {
  $$(".nav-item").forEach((a) => {
    a.addEventListener("click", (e) => {
      e.preventDefault();
      setView(a.dataset.view);
    });
  });

  $("#refresh-btn").addEventListener("click", () => refresh());

  $("#close-details").addEventListener("click", () => {
    $("#report-details").classList.add("hidden");
    state.selected = null;
  });

  $("#filter").addEventListener("input", () => {
    const q = $("#filter").value.trim().toLowerCase();
    const rows = !q
      ? state.reports
      : state.reports.filter((r) =>
          String(r.summary || "").toLowerCase().includes(q) || String(r.id || "").toLowerCase().includes(q)
        );
    renderTable($("#reports-table"), rows);
  });
}

bindEvents();
setView("dashboard");
refresh();