// --- tiny helpers ---------------------------------------------------------
const $ = (sel) => document.querySelector(sel);
const el = (tag, props = {}, ...kids) => {
  const n = Object.assign(document.createElement(tag), props);
  for (const k of kids) n.append(k?.nodeType ? k : document.createTextNode(k ?? ""));
  return n;
};
const api = async (path, opts) => {
  const res = await fetch("/api" + path, {
    headers: { "Content-Type": "application/json" },
    ...opts,
  });
  if (!res.ok) {
    const body = await res.json().catch(() => ({}));
    throw new Error(body.error || res.statusText);
  }
  return res.status === 204 ? null : res.json();
};
function toast(msg) {
  let t = $(".toast");
  if (!t) { t = el("div", { className: "toast" }); document.body.append(t); }
  t.textContent = msg;
  t.classList.add("show");
  clearTimeout(t._timer);
  t._timer = setTimeout(() => t.classList.remove("show"), 2200);
}
function relTime(iso) {
  if (!iso) return "never";
  const d = new Date(iso), now = new Date();
  const days = Math.floor((now - d) / 86400000);
  if (days <= 0) return "today";
  if (days === 1) return "yesterday";
  if (days < 30) return days + "d ago";
  if (days < 365) return Math.floor(days / 30) + "mo ago";
  return Math.floor(days / 365) + "y ago";
}
const fmtDate = (iso) => (iso ? new Date(iso).toLocaleDateString() : "");

// --- state ----------------------------------------------------------------
let state = { q: "", tag: "", sort: "name", selectedId: null };

// --- list -----------------------------------------------------------------
async function refresh() {
  const [stats, list] = await Promise.all([
    api("/stats"),
    api(`/people?q=${encodeURIComponent(state.q)}&tag=${encodeURIComponent(state.tag)}&sort=${state.sort}`),
  ]);
  $("#stats").textContent = `${stats.people} contacts · ${stats.interactions} interactions · ${stats.relationships} links`;
  renderList(list);
}

function renderList(list) {
  const ul = $("#list");
  ul.innerHTML = "";
  if (!list.length) { ul.append(el("li", { className: "hint" }, "No matches.")); return; }
  for (const p of list) {
    const meta = el("div", { className: "meta" },
      el("span", {}, `📇 ${relTime(p.last_contacted)}`),
      p.location ? el("span", {}, `📍 ${p.location}`) : "",
      p.interaction_count ? el("span", {}, `${p.interaction_count}×`) : "",
    );
    (p.tags || []).forEach((t) => meta.append(el("span", { className: "tagchip" }, t)));
    const li = el("li", { className: p.id === state.selectedId ? "active" : "" },
      el("span", { className: "name" }, p.full_name),
      meta,
    );
    li.onclick = () => selectPerson(p.id);
    ul.append(li);
  }
}

async function loadTags() {
  const tags = await api("/tags");
  const sel = $("#tag");
  sel.innerHTML = '<option value="">All tags</option>';
  tags.forEach((t) => sel.append(el("option", { value: t.tag }, `${t.tag} (${t.count})`)));
  sel.value = state.tag;
}

// --- detail ---------------------------------------------------------------
async function selectPerson(id) {
  state.selectedId = id;
  document.querySelectorAll(".list li").forEach((li) => li.classList.remove("active"));
  const p = await api(`/people/${id}`);
  renderDetail(p);
  refresh();
}

function field(label, input) {
  return el("div", { className: "row" }, el("label", {}, label), el("div", { className: "field" }, input));
}

function renderDetail(p) {
  const d = $("#detail");
  d.innerHTML = "";

  // --- editable info block ---
  const nameI = el("input", { value: p.full_name });
  const emailI = el("input", { value: p.email || "", type: "email" });
  const phoneI = el("input", { value: p.phone || "", type: "tel", placeholder: "+61…" });
  const locationI = el("input", { value: p.location || "", placeholder: "City, country" });
  const tagsI = el("input", { value: (p.tags || []).join(", ") });
  const notesI = el("textarea", { value: p.notes || "" });

  const save = el("button", { className: "primary" }, "Save");
  save.onclick = async () => {
    try {
      await api(`/people/${p.id}`, {
        method: "PATCH",
        body: JSON.stringify({ full_name: nameI.value, email: emailI.value, phone: phoneI.value, location: locationI.value, tags: tagsI.value, notes: notesI.value }),
      });
      toast("Saved");
      await loadTags();
      selectPerson(p.id);
    } catch (e) { toast(e.message); }
  };

  const del = el("button", { className: "danger" }, "Delete");
  del.onclick = async () => {
    if (!confirm(`Delete ${p.full_name}? This removes their interactions too.`)) return;
    try {
      await api(`/people/${p.id}`, { method: "DELETE" });
      toast("Deleted");
      state.selectedId = null;
      d.innerHTML = '<p class="empty">Select a contact, or add a new one.</p>';
      loadTags(); refresh();
    } catch (e) { toast(e.message); }
  };

  const info = el("section", { className: "block" },
    el("h2", {}, p.full_name),
    el("p", { className: "sub" }, `Last contacted ${relTime(p.last_contacted || (p.interactions[0]?.occurred_at))}`),
    field("Name", nameI), field("Email", emailI), field("Phone", phoneI), field("Location", locationI), field("Tags", tagsI), field("Notes", notesI),
    el("div", { className: "actions" }, save, del),
  );
  d.append(info);

  // --- relationships ---
  if (p.relationships?.length) {
    const rl = el("ul", { className: "timeline" });
    p.relationships.forEach((r) => {
      const link = el("a", { href: "#", style: "color:var(--accent)" }, r.other_name);
      link.onclick = (e) => { e.preventDefault(); selectPerson(r.other_id); };
      rl.append(el("li", {}, el("span", { className: "badge" }, r.type), " ", link, r.notes ? ` — ${r.notes}` : ""));
    });
    d.append(el("section", { className: "block" }, el("h3", {}, "Relationships"), rl));
  }

  // --- interactions ---
  const typeI = el("select", {},
    ...["call", "message", "email", "meetup", "note", "other"].map((t) => el("option", { value: t }, t)));
  const whenI = el("input", { type: "date", value: new Date().toISOString().slice(0, 10) });
  const summaryI = el("input", { placeholder: "What happened? (short summary)" });
  const inotesI = el("textarea", { placeholder: "Details (optional)" });
  const logBtn = el("button", { className: "primary" }, "Log interaction");
  logBtn.onclick = async () => {
    if (!summaryI.value.trim() && !inotesI.value.trim()) return toast("Add a summary first");
    try {
      await api(`/people/${p.id}/interactions`, {
        method: "POST",
        body: JSON.stringify({ type: typeI.value, occurred_at: whenI.value, summary: summaryI.value, notes: inotesI.value }),
      });
      toast("Logged");
      selectPerson(p.id);
    } catch (e) { toast(e.message); }
  };

  const timeline = el("ul", { className: "timeline" });
  if (!p.interactions.length) timeline.append(el("li", { className: "hint" }, "No interactions logged yet."));
  p.interactions.forEach((i) => {
    const delI = el("button", { className: "ghost", style: "float:right;color:var(--muted)" }, "✕");
    delI.onclick = async () => {
      if (!confirm("Delete this interaction?")) return;
      await api(`/interactions/${i.id}`, { method: "DELETE" });
      toast("Removed"); selectPerson(p.id);
    };
    timeline.append(el("li", {},
      delI,
      el("div", { className: "when" }, `${fmtDate(i.occurred_at)} · `, el("span", { className: "badge" }, i.type || "note")),
      el("div", {}, i.summary || ""),
      i.notes ? el("div", { className: "hint" }, i.notes) : "",
    ));
  });

  d.append(el("section", { className: "block" },
    el("h3", {}, "Log an interaction"),
    el("div", { className: "inline-form" }, field("Type", typeI), field("Date", whenI), field("Summary", summaryI), field("Notes", inotesI), logBtn),
  ));
  d.append(el("section", { className: "block" }, el("h3", {}, "History"), timeline));
}

// --- add contact ----------------------------------------------------------
function showAddForm() {
  state.selectedId = null;
  document.querySelectorAll(".list li").forEach((li) => li.classList.remove("active"));
  const d = $("#detail");
  d.innerHTML = "";
  const nameI = el("input", { placeholder: "Full name *" });
  const emailI = el("input", { type: "email", placeholder: "email@example.com" });
  const phoneI = el("input", { type: "tel", placeholder: "+61…" });
  const locationI = el("input", { placeholder: "City, country" });
  const tagsI = el("input", { placeholder: "comma, separated, tags" });
  const notesI = el("textarea", { placeholder: "Notes" });
  const create = el("button", { className: "primary" }, "Create contact");
  create.onclick = async () => {
    if (!nameI.value.trim()) return toast("Name is required");
    try {
      const p = await api("/people", {
        method: "POST",
        body: JSON.stringify({ full_name: nameI.value, email: emailI.value, phone: phoneI.value, location: locationI.value, tags: tagsI.value, notes: notesI.value }),
      });
      toast("Created");
      await loadTags();
      selectPerson(p.id);
    } catch (e) { toast(e.message); }
  };
  d.append(el("section", { className: "block" },
    el("h3", {}, "New contact"),
    field("Name", nameI), field("Email", emailI), field("Phone", phoneI), field("Location", locationI), field("Tags", tagsI), field("Notes", notesI),
    el("div", { className: "actions" }, create),
  ));
}

// --- wire up --------------------------------------------------------------
let searchTimer;
$("#search").oninput = (e) => { state.q = e.target.value; clearTimeout(searchTimer); searchTimer = setTimeout(refresh, 200); };
$("#tag").onchange = (e) => { state.tag = e.target.value; refresh(); };
$("#sort").onchange = (e) => { state.sort = e.target.value; refresh(); };
$("#add-btn").onclick = showAddForm;

loadTags();
refresh();