// Reservations: fixed addresses for clients.
import { h, mount, table, time, input, modal, errorBox, field, confirmDialog, select, debounce, badge, checkbox } from "../ui.js";
import { get, change, can } from "../api.js";
import { optionsEditor, subnetLabel } from "../widgets.js";
import { onLeave } from "../app.js";

// reservationsTable lists reservations with Edit and Delete.
export function reservationsTable(rs, done, opts = {}) {
  const write = can("config", true);
  return table([
    { label: "Address", render: (r) => [h("span", { class: "mono" }, r.ip), r.disabled ? [" ", badge("disabled", "off")] : null] },
    { label: "Client", render: (r) => h("span", { class: "mono" }, r.client_id ? "id " + r.client_id : r.mac) },
    { label: "Host name", render: (r) => r.hostname || h("span", { class: "muted" }, "–") },
    opts.subnet ? null : { label: "Subnet", render: (r) => r.subnet_id ? h("a", { href: "#/subnets/" + r.subnet_id }, r.subnet) : "–" },
    { label: "Online", render: (r) => r.lease
      ? h("span", { title: "lease until " + new Date(r.lease.end).toLocaleString() }, badge("online", "ok"), h("span", { class: "muted small" }, " on " + r.lease.interface),
          r.lease.last_seen ? h("span", { class: "muted small", title: "last answered a ping" }, ", seen ", time(r.lease.last_seen)) : null)
      : badge("offline") },
    { label: "Options", render: (r) => r.options.length ? h("span", { class: "mono small" }, r.options.map((o) => o.name + "=" + o.value).join("; ")) : "" },
    { label: "Comment", render: (r) => r.comment },
    write ? { label: "", tdClass: "actions-cell", render: (r) => [
      h("button", { class: "small reveal", onclick: () => reservationDialog(r, done) }, "Edit"), " ",
      h("button", { class: "small reveal", title: r.disabled ? "Use this reservation again" : "Keep it, but ignore it: the client gets a pool address like any other",
        onclick: () => toggle(r, done) }, r.disabled ? "Enable" : "Disable"), " ",
      h("button", { class: "small reveal", onclick: () => del(r, done) }, "Delete"),
    ] } : null,
  ].filter(Boolean), rs, { empty: opts.empty || "No reservations.", rowClass: (r) => r.disabled ? "disabled" : "" });
}

async function toggle(r, done) {
  try {
    await change("PATCH", "/reservations/" + r.id, { disabled: !r.disabled });
    done();
  } catch (e) { modal(r.disabled ? "Not enabled" : "Not disabled", errorBox(e)); }
}

async function del(r, done) {
  if (!await confirmDialog("Delete reservation", "Delete the reservation of " + r.ip + " for " + (r.hostname || r.mac || r.client_id) + "? The client keeps its address until its lease runs out.", "Delete", "danger")) return;
  try {
    await change("DELETE", "/reservations/" + r.id);
    done();
  } catch (e) { modal("Not deleted", errorBox(e)); }
}

// reservationDialog adds (r null) or edits a reservation. preset may give
// {ip, mac, hostname} for a new one.
export async function reservationDialog(r, done, preset = {}) {
  const [settings, subnets] = await Promise.all([get("/settings"), get("/subnets")]);
  // What the client gets from above: the settings', then its subnet's.
  const sub = subnets.find((x) => x.id === (r && r.subnet_id));
  const inherited = [...settings.options.filter((o) => !(sub && sub.options.some((x) => x.code === o.code))), ...(sub ? sub.options : [])];
  const ip = input({ value: r ? r.ip : preset.ip || "", placeholder: "10.0.10.20", class: "mono" });
  const mac = input({ value: r ? r.mac || "" : preset.mac || "", placeholder: "aa:bb:cc:dd:ee:ff", class: "mono" });
  const cid = input({ value: r ? r.client_id || "" : "", placeholder: "only for clients known by a client identifier", class: "mono" });
  const host = input({ value: r ? r.hostname : preset.hostname || "", placeholder: "nas" });
  const opts = await optionsEditor(r ? r.options : [], inherited);
  const comment = input({ value: r ? r.comment : "" });
  const disabled = checkbox("Disabled: keep it, but ignore it (the client gets a pool address like any other)", r ? r.disabled : false);
  const err = h("div");
  const body = h("div", null, h("div", { class: "form-grid" },
    field("Address", ip, "Its subnet is the one whose network holds it. Inside a pool is fine: nobody else gets it."),
    field("MAC address", mac),
    field("Client identifier", cid, "Optional: match the client's identifier (option 61, hex) instead of its MAC address."),
    field("Host name", host, "Sent to the client."),
    field("Options", opts, "Only for this client; they win over the subnet's."),
    field("Comment", comment),
    r ? [h("label"), disabled] : null), err);
  await modal(r ? "Edit reservation " + r.ip : "New reservation", body, [
    { label: "Cancel", value: null },
    { label: r ? "Save" : "Add reservation", kind: "primary", onclick: async () => {
      mount(err);
      const v = { ip: ip.value.trim(), mac: mac.value.trim(), client_id: cid.value.trim(), hostname: host.value.trim(), options: opts.value(), comment: comment.value };
      if (r) v.disabled = disabled.input.checked;
      try {
        await change(r ? "PATCH" : "POST", r ? "/reservations/" + r.id : "/reservations", v);
        done();
        return true;
      } catch (e) {
        mount(err, errorBox(e));
        return false;
      }
    } },
  ], { wide: true, sticky: true });
}

export async function render(el, params, query) {
  const subnets = await get("/subnets");
  const subnetSel = select([["", "all subnets"], ...subnets.map((s) => [String(s.id), subnetLabel(s)])], query.get("subnet") || "");
  const search = input({ type: "search", placeholder: "address, MAC or host name" });
  const out = h("div");
  let gen = 0;
  const draw = async () => {
    const my = ++gen;
    const q = search.value.trim().toLowerCase();
    const rs = (await get("/reservations", { subnet: subnetSel.value })).filter((r) =>
      !q || r.ip.includes(q) || (r.mac || "").includes(q) || (r.hostname || "").toLowerCase().includes(q) || (r.client_id || "").includes(q));
    if (my !== gen) return; // a newer draw (typing, a change) won
    mount(out, reservationsTable(rs, draw, { empty: q || subnetSel.value ? "None match." : "No reservations yet." }));
  };
  subnetSel.addEventListener("change", draw);
  search.addEventListener("input", debounce(draw, 200));
  mount(el,
    h("div", { class: "page-head" },
      h("div", { class: "grow" }, h("h1", null, "Reservations"), h("div", { class: "muted" }, "Fixed addresses for clients, by MAC address or client identifier. Refreshed every 15 seconds.")),
      can("config", true) ? h("div", { class: "actions" }, h("button", { class: "primary", onclick: () => reservationDialog(null, draw) }, "New reservation")) : null),
    h("div", { class: "filter-row" }, subnetSel, search),
    h("div", { class: "panel" }, out));
  await draw();
  // Online and last seen change as clients come and go.
  const t = setInterval(() => { if (!document.hidden) draw().catch(() => {}); }, 15000);
  onLeave(() => clearInterval(t));
}