import { useEffect, useRef, useState } from "react";
import { habitRequest, scheduleLabel, type TodayHabit } from "../lib/dashboard";
import { Button } from "./design-system/primitives";
import { Archive, ChevronDown, RotateCcw } from "lucide-react";
import { FormMessage, WorkspacePanel } from "./design-system/WorkspacePanel";
import { HabitHistory } from "./HabitHistory";

export function ArchivedHabits({ date, revision, onChanged, onExpired, onClose }: {
  date: string; revision: number; onChanged: () => void; onExpired: () => void; onClose?: () => void;
}) {
  const [habits, setHabits] = useState<TodayHabit[]>([]);
  const [selected, setSelected] = useState<string>();
  const [error, setError] = useState("");
  const [notice, setNotice] = useState("");
  const [loading, setLoading] = useState(true);
  const [busy, setBusy] = useState(false);
  const [attempt, setAttempt] = useState(0);
  const saving = useRef(false);
  const expired = useRef(onExpired); expired.current = onExpired;
  useEffect(() => {
    const controller = new AbortController(); setLoading(true); setError("");
    habitRequest<{ habits: TodayHabit[] }>(`/days/${date}`, { signal: controller.signal })
      .then(data => { if (!controller.signal.aborted) setHabits(data.habits.filter(habit => habit.requirements?.archived)); })
      .catch(error => { if (!controller.signal.aborted) { setError(error.message); if (error.message.includes("session has expired")) expired.current(); } })
      .finally(() => { if (!controller.signal.aborted) setLoading(false); });
    return () => controller.abort();
  }, [date, revision, attempt]);
  async function restore(habit: TodayHabit) {
    if (saving.current) return;
    saving.current = true; setBusy(true); setError(""); setNotice("");
    try {
      await habitRequest(`/habits/${habit.habitId}`, { method: "PATCH", headers: { "Content-Type": "application/json" }, body: JSON.stringify({ archived: false }) });
      setHabits(current => current.filter(item => item.habitId !== habit.habitId));
      setNotice(`${habit.name} restored. Check-ins resume today.`); onChanged();
    } catch (error) {
      const message = error instanceof Error ? error.message : "Could not restore. Try again.";
      setError(message); if (message.includes("session has expired")) expired.current();
    } finally { saving.current = false; setBusy(false); }
  }
  return <WorkspacePanel id="archived-habits" eyebrow="SAVED FOR LATER" title="Archived habits" description="Earlier progress stays here. Restore a habit whenever you’re ready." onClose={busy ? undefined : onClose} closeLabel="Close archive">
    <FormMessage error>{error}</FormMessage>
    {error && <Button variant="secondary" onClick={() => setAttempt(value => value + 1)}>Retry archive</Button>}
    {loading ? <p className="ds-supporting-copy" role="status">Loading archive…</p> : !habits.length && <div className="ds-empty-panel"><Archive size={24} aria-hidden="true" /><div><p className="type-ui-heading">No archived habits.</p><p className="ds-supporting-copy">When you put a habit aside, its history will be waiting here.</p></div></div>}
    <FormMessage>{notice}</FormMessage>
    <div className="ds-record-list">
      {habits.map(habit => <article key={habit.habitId} className="ds-record" aria-labelledby={`archive-title-${habit.habitId}`}>
        <header className="ds-record-heading">
          <div className="ds-record-copy"><h3 id={`archive-title-${habit.habitId}`}>{habit.name ?? "Habit"}</h3><p>{scheduleLabel(habit.requirements?.schedule)} · Archived</p></div>
          <div className="ds-action-row">
            <Button variant="text" onClick={() => setSelected(selected === habit.habitId ? undefined : habit.habitId)} aria-expanded={selected === habit.habitId} aria-controls={selected === habit.habitId ? `archive-history-${habit.habitId}` : undefined}>{selected === habit.habitId ? "Hide history" : "View history"}<ChevronDown className="ds-disclosure-icon" size={16} aria-hidden="true" /></Button>
            <Button variant="secondary" disabled={busy || loading} aria-label={`Restore ${habit.name}`} onClick={() => void restore(habit)}><RotateCcw size={16} aria-hidden="true" />Restore</Button>
          </div>
        </header>
        {selected === habit.habitId && <div className="ds-record-detail" id={`archive-history-${habit.habitId}`}><HabitHistory calendarOnly habit={habit} date={date} revision={revision + attempt} disabled={busy || loading} onExpired={onExpired} onHistorySaved={() => setAttempt(value => value + 1)} /></div>}
      </article>)}
    </div>
  </WorkspacePanel>;
}
