// articles page — list + keyword/status/source filtering + edit modal
// filter state is persisted to the url query so reload/share keeps it.
// depends on: app.js (api, toast, escapeHtml, PAGE, badgeHtml, query*)

let articleOffset = 0;
let currentArticle = null;


async function loadSources() {
  const sources = await api("/admin/api/sources");
  const sel = document.getElementById("f-source");

  const current = queryGet("source");

  sources.forEach(s => {
    const opt = document.createElement("option");
    opt.value = s;
    opt.textContent = s;
    sel.appendChild(opt);
  });

  if (current) sel.value = current;
}


function getFilters() {
  const sel = document.getElementById("f-source");
  return {
    keyword:        document.getElementById("f-keyword").value.trim(),
    // fall back to url when the dropdown hasn't populated yet —
    // lets us fire loadArticles in parallel with loadSources on init
    source:         sel.value || queryGet("source"),
    content_status: document.getElementById("f-status").value,
    from:           document.getElementById("f-from").value,
    to:             document.getElementById("f-to").value,
  };
}


// sync current filters + offset into url so the state is bookmarkable
function syncUrl() {
  const f = getFilters();
  queryWrite({
    ...f,
    offset: articleOffset > 0 ? articleOffset : "",
  });
}


async function loadArticles() {
  const f = getFilters();
  const params = new URLSearchParams({ limit: PAGE, offset: articleOffset });
  if (f.keyword)        params.set("keyword", f.keyword);
  if (f.source)         params.set("source", f.source);
  if (f.content_status) params.set("content_status", f.content_status);
  if (f.from)           params.set("from", f.from + "T00:00:00");
  if (f.to)             params.set("to", f.to + "T23:59:59");

  const data = await api(`/admin/api/articles?${params}`);
  const tbody = document.getElementById("articleTable");

  tbody.innerHTML = data.rows.map(r => `
    <tr>
      <td style="color:var(--muted-dark); font-size:12px">${r.id}</td>
      <td>
        <span class="truncate" title="${escapeHtml(r.title)}">${escapeHtml(r.title)}</span>
        <a class="url-link" href="${r.url}" target="_blank" style="font-size:11px; display:block; margin-top:3px; color:var(--muted-dark)">↗ ${new URL(r.url).hostname}</a>
      </td>
      <td style="color:var(--muted)">${r.source}</td>
      <td>${badgeHtml(r.content_status)}</td>
      <td style="color:var(--muted-dark); white-space:nowrap; font-size:12px">${r.ingested_at ? r.ingested_at.slice(0, 16) : "—"}</td>
      <td><button onclick="openArticle(${r.id})">Edit</button></td>
    </tr>
  `).join("");

  const total = data.total;
  document.getElementById("pageInfo").textContent =
    `${articleOffset + 1}–${Math.min(articleOffset + PAGE, total)} of ${total.toLocaleString()}`;

  document.getElementById("prevBtn").disabled = articleOffset === 0;
  document.getElementById("nextBtn").disabled = articleOffset + PAGE >= total;
}


async function openArticle(id) {
  currentArticle = await api(`/admin/api/articles/${id}`);
  const a = currentArticle;

  document.getElementById("modalTitle").textContent = `Article #${a.id}`;

  document.getElementById("modalMeta").innerHTML = [
    a.source && `<span>source: <b>${escapeHtml(a.source)}</b></span>`,
    a.pub_date && `<span>pub: ${a.pub_date.slice(0, 16)}</span>`,
    `<span>has_embedding: ${a.has_embedding ? "yes" : "no"}</span>`,
    a.content_error && `<span style="color:#fca5a5">error: ${escapeHtml(a.content_error.slice(0, 80))}</span>`,
  ].filter(Boolean).join("");

  document.getElementById("m-title").value     = a.title || "";
  document.getElementById("m-desc").value      = a.description || "";
  document.getElementById("m-content").value   = a.content || "";
  document.getElementById("m-status").value    = a.content_status || "";
  document.getElementById("m-lang").value      = a.language || "";
  document.getElementById("m-pubdate").value   = a.pub_date || "";
  document.getElementById("m-indexpage").value = String(a.is_index_page || 0);

  document.getElementById("articleOverlay").classList.add("open");
}


document.addEventListener("DOMContentLoaded", async () => {

  // restore filter inputs from the current url
  queryApplyToInputs({
    "f-keyword": "keyword",
    "f-status":  "content_status",
    "f-from":    "from",
    "f-to":      "to",
  });
  articleOffset = parseInt(queryGet("offset"), 10) || 0;


  document.getElementById("searchBtn").onclick = () => {
    articleOffset = 0;
    syncUrl();
    loadArticles();
  };

  document.getElementById("prevBtn").onclick = () => {
    articleOffset = Math.max(0, articleOffset - PAGE);
    syncUrl();
    loadArticles();
  };

  document.getElementById("nextBtn").onclick = () => {
    articleOffset += PAGE;
    syncUrl();
    loadArticles();
  };

  document.querySelector(".filters").addEventListener("keydown", e => {
    if (e.key === "Enter") {
      articleOffset = 0;
      syncUrl();
      loadArticles();
    }
  });


  document.getElementById("cancelBtn").onclick = () =>
    document.getElementById("articleOverlay").classList.remove("open");

  document.getElementById("saveBtn").onclick = async () => {
    if (!currentArticle) return;
    try {
      await api(`/admin/api/articles/${currentArticle.id}`, {
        method: "PATCH",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({
          title:          document.getElementById("m-title").value,
          description:    document.getElementById("m-desc").value,
          content:        document.getElementById("m-content").value,
          content_status: document.getElementById("m-status").value || null,
          language:       document.getElementById("m-lang").value || null,
          pub_date:       document.getElementById("m-pubdate").value || null,
          is_index_page:  parseInt(document.getElementById("m-indexpage").value, 10),
        }),
      });
      document.getElementById("articleOverlay").classList.remove("open");
      toast("Saved");
      loadArticles();
    } catch (e) {
      toast("Save failed", true);
    }
  };

  document.getElementById("deleteBtn").onclick = async () => {
    if (!currentArticle) return;
    if (!confirm(`Delete article #${currentArticle.id}? This cannot be undone.`)) return;
    try {
      await api(`/admin/api/articles/${currentArticle.id}`, { method: "DELETE" });
      document.getElementById("articleOverlay").classList.remove("open");
      toast("Deleted");
      loadArticles();
      loadGlobalStats();
    } catch (e) {
      toast("Delete failed", true);
    }
  };

  // both calls can run concurrently — loadArticles falls back to the
  // url param for source until the dropdown finishes populating.
  await Promise.all([loadSources(), loadArticles()]);
});