// Dashboard SCH3DUL3S tab — read-only list of the scheduled prompts left
// in the hive's store, so the operator can recreate them with
// `swarmctl schedule`. Nothing on the hive fires or edits them; the list
// is fetched from `/api/schedules` on tab activation and state loads.
//
// Owns its own module state (the schedules list); reads the shared agent
// roster from state.js for the per-agent columns. Render + format helpers
// come from util.js.
//
// Note: per-agent reminders live in the in-container store, not here —
// they surface via get_loose_ends / the todos pill on the agent page.

import { $ } from "./common.js";
import { el } from "@hive/shared/dom.js";
import { paintAtomic, epochSec, fmtAgo, fmtDuration } from "./util.js";
import { containersState } from "./state.js";

// Local cache lets `refreshTabCounts` show the active count without
// re-fetching every second.
let schedulesState = [];
export async function refreshSchedules() {
  const listRoot = $("schedules-section");
  if (!listRoot) return;
  try {
    const resp = await fetch("/api/schedules");
    if (!resp.ok) {
      paintAtomic(listRoot, (root) => {
        root.append(
          el(
            "p",
            { class: "empty" },
            "schedules unavailable: http " + resp.status,
          ),
        );
      });
      return;
    }
    schedulesState = await resp.json();
  } catch (err) {
    paintAtomic(listRoot, (root) => {
      root.append(
        el("p", { class: "empty" }, "schedules fetch failed: " + err),
      );
    });
    return;
  }
  renderSchedulesList();
}
// Active = at least one target still alive (no `cancelled_at_unix`)
// AND the whole schedule isn't cancelled. Drives the tab pill count.
export function activeScheduleCount() {
  let n = 0;
  for (const s of schedulesState) {
    if (s.cancelled_at_unix) continue;
    if ((s.targets || []).some((t) => !t.cancelled_at_unix)) n++;
  }
  return n;
}
// Table layout: one row per schedule, attribute columns + one ✓/✕
// column per agent (vertical header so a row of agents takes ~28px
// each instead of full word width).
function renderSchedulesList() {
  const liveRoot = $("schedules-section");
  if (!liveRoot) return;
  paintAtomic(liveRoot, (root) => {
    if (!schedulesState.length) {
      root.append(el("p", { class: "empty" }, "no schedules left"));
      return;
    }
    const agents = schedulesTableAgentSet();
    const table = el("table", { class: "schedules-table" });
    table.append(renderSchedulesTableHead(agents));
    const tbody = el("tbody", {});
    const sorted = schedulesState.slice().sort((a, b) => {
      // Cancelled → bucket 2, paused → bucket 1, active → bucket 0.
      const aOrd = a.cancelled_at_unix ? 2 : a.paused_at_unix ? 1 : 0;
      const bOrd = b.cancelled_at_unix ? 2 : b.paused_at_unix ? 1 : 0;
      if (aOrd !== bOrd) return aOrd - bOrd;
      return epochSec(a.next_fire_at_unix) - epochSec(b.next_fire_at_unix);
    });
    for (const s of sorted) tbody.append(renderScheduleRow(s, agents));
    table.append(tbody);
    const wrap = el("div", { class: "schedules-table-wrap" });
    wrap.append(table);
    root.append(wrap);
  });
}
// The set of agent columns in the schedules table: live containers
// (sorted), then any extra names that appear as a schedule target but
// aren't in the live container list.
function schedulesTableAgentSet() {
  const seen = new Set();
  const out = [];
  const push = (n) => {
    if (!seen.has(n)) {
      seen.add(n);
      out.push(n);
    }
  };
  const containerNames = Array.from(containersState.values())
    .map((c) => c.name)
    .filter((n) => n !== "operator")
    .sort();
  for (const n of containerNames) push(n);
  for (const s of schedulesState) {
    for (const t of s.targets || []) push(t.target);
  }
  return out;
}
function renderSchedulesTableHead(agents) {
  const thead = el("thead", {});
  const headerRow = el("tr", {});
  headerRow.append(
    el("th", { class: "schedules-table-id" }, "#"),
    el("th", {}, "src"),
    el("th", { class: "schedules-table-next-col" }, "next"),
    el("th", { class: "schedules-table-every-col" }, "every"),
    el("th", {}, "owner"),
    el("th", { class: "schedules-table-body-th" }, "body"),
  );
  // Every column maps to a container, so flag any column whose agent is
  // no longer in the live roster — its past schedules linger in the
  // table but the agent is gone.
  const liveNames = new Set(
    Array.from(containersState.values()).map((c) => c.name),
  );
  for (const a of agents) {
    const gone = !liveNames.has(a);
    headerRow.append(
      el(
        "th",
        {
          class:
            "schedules-table-agent-th" +
            (gone ? " schedules-table-agent-th--gone" : ""),
          title: gone ? a + " — no longer exists (gone)" : a,
        },
        el("div", {}, el("span", {}, a)),
      ),
    );
  }
  thead.append(headerRow);
  return thead;
}
function renderScheduleRow(s, agents) {
  const cancelled = !!s.cancelled_at_unix;
  const paused = !cancelled && !!s.paused_at_unix;
  const tr = el("tr", {
    class:
      "schedules-table-row" +
      (cancelled ? " schedules-table-row-cancelled" : "") +
      (paused ? " schedules-table-row-paused" : ""),
  });

  tr.append(el("td", { class: "meta schedules-table-id" }, "#" + s.id));

  const srcKind =
    s.source && s.source.kind === "approval" ? "approval" : "manual";
  tr.append(
    el(
      "td",
      {},
      el(
        "span",
        { class: "rqe-source rqe-source-" + srcKind },
        srcKind === "approval" ? "approval" : "operator",
      ),
    ),
  );

  // "next" cell — the stored next fire time, absolute: it is the value
  // to pass as `swarmctl schedule add --at`. Cancelled / paused rows say
  // so, with the time in the title.
  const nextIso = new Date(s.next_fire_at_unix).toISOString();
  const nextCell = el("td", { class: "meta schedules-table-next-col" });
  if (cancelled) {
    nextCell.title = "cancelled " + new Date(s.cancelled_at_unix).toISOString();
    nextCell.textContent = "cancelled";
  } else if (paused) {
    nextCell.title =
      "paused since " +
      new Date(s.paused_at_unix).toISOString() +
      "\nnext fire " +
      nextIso;
    nextCell.append(el("span", { class: "sched-paused-label" }, "⏸ paused"));
  } else {
    nextCell.textContent = nextIso;
  }
  tr.append(nextCell);

  tr.append(
    el(
      "td",
      { class: "meta schedules-table-every-col" },
      s.interval_seconds ? "↻ " + fmtDuration(s.interval_seconds) : "one-shot",
    ),
  );

  tr.append(el("td", { class: "meta" }, s.owner));

  // Body cell — truncates with ellipsis; full body + description on hover.
  const bodyCell = el("td", { class: "schedules-table-body-cell" });
  const bodyText = s.body || "";
  bodyCell.title = (s.description ? s.description + "\n\n" : "") + bodyText;
  bodyCell.textContent = bodyText;
  tr.append(bodyCell);

  // Per-agent target cells: ✓ active target, muted ✕ cancelled target,
  // empty when the agent isn't a target. Last fire + result on hover.
  const targetByName = new Map();
  for (const t of s.targets || []) targetByName.set(t.target, t);
  for (const a of agents) {
    const t = targetByName.get(a);
    const td = el("td", { class: "schedules-table-check" });
    if (t) {
      td.title =
        (t.cancelled_at_unix ? "cancelled — " : "") +
        (t.last_fired_at_unix
          ? "last fired " + fmtAgo(t.last_fired_at_unix) + " ago"
          : "never fired") +
        (t.last_result ? " · " + t.last_result : "");
      td.append(
        t.cancelled_at_unix
          ? el("span", { class: "schedules-table-check-cancelled" }, "✕")
          : el("span", {}, "✓"),
      );
    }
    tr.append(td);
  }

  return tr;
}