// frontend/components/calendar/EvPopover.tsx — 이벤트 상세 팝오버
"use client";
import { useState } from "react";
import { Icon } from "@/components/Icon";
import { fmt } from "@/lib/calendar/time";
import type { Attendee, CalEvent, Calendar } from "@/lib/calendar/types";

function rruleLabel(r: string): string {
  if (!r) return "";
  if (r.includes("DAILY")) return "매일 반복";
  if (r.includes("BYDAY=MO,TU,WE,TH,FR")) return "평일 반복";
  if (r.includes("WEEKLY")) return "매주 반복";
  if (r.includes("MONTHLY")) return "매월 반복";
  if (r.includes("YEARLY")) return "매년 반복";
  return "반복 일정";
}
function reminderLabel(mins: number[]): string {
  if (!mins.length) return "";
  return mins.map((m) => (m === 0 ? "시작 시각" : `${m}분 전`)).join(", ") + " 알림";
}
const STATUS_KO: Record<string, string> = {
  accepted: "수락",
  declined: "거절",
  tentative: "미정",
  needsAction: "대기",
  notResponded: "대기",
  none: "",
};

export function EvPopover({
  ev,
  x,
  y,
  cal,
  onClose,
  onMeet,
  onEdit,
  onDelete,
  onAddToTasks,
  onRsvp,
}: {
  ev: CalEvent;
  x: number;
  y: number;
  cal: Calendar;
  onClose: () => void;
  onMeet: (ev: CalEvent) => void;
  onEdit: (ev: CalEvent) => void;
  onDelete: (ev: CalEvent) => void;
  onAddToTasks: (ev: CalEvent) => Promise<void>;
  onRsvp: (ev: CalEvent, status: "accepted" | "declined" | "tentative") => Promise<void>;
}) {
  // 작업 추가 상태: idle → busy → done | error
  const [addState, setAddState] = useState<"idle" | "busy" | "done" | "error">("idle");
  const addToTasks = async () => {
    if (addState === "busy" || addState === "done") return;
    setAddState("busy");
    try {
      await onAddToTasks(ev);
      setAddState("done");
    } catch {
      setAddState("error");
    }
  };
  let left = x;
  let top = y;
  if (typeof window !== "undefined") {
    if (left + 300 > window.innerWidth - 12) left = window.innerWidth - 312;
    if (top + 280 > window.innerHeight - 12) top = window.innerHeight - 292;
  }
  return (
    <>
      <div className="dp-backdrop" onClick={onClose} />
      <div className={"epop tint-" + cal.tone} style={{ left: left + "px", top: top + "px" }}>
        <div className="epop-bar" />
        <div className="epop-title">{ev.title}</div>
        <div className="epop-row">
          <Icon name="clock" /> {fmt(ev.start)} – {fmt(ev.end)}
        </div>
        <div className="epop-row">
          <Icon name="cal" />{" "}
          <span className="epop-cat">
            <span className="pdot" /> {cal.name}
          </span>
        </div>
        {ev.loc && (
          <div className="epop-row">
            <Icon name="pin" /> {ev.loc}
          </div>
        )}
        {ev.rrule && (
          <div className="epop-row">
            <Icon name="repeat" /> {rruleLabel(ev.rrule)}
          </div>
        )}
        {ev.reminders.length > 0 && (
          <div className="epop-row">
            <Icon name="bell" /> {reminderLabel(ev.reminders)}
          </div>
        )}
        {ev.attendees.length > 0 ? (
          <div className="epop-attendees">
            <div className="epop-row">
              <Icon name="users" /> 참석자 {ev.attendees.length}명
            </div>
            {ev.attendees.map((a: Attendee, i) => (
              <div className="epop-att" key={i}>
                <span className="epa-name">{a.name || a.email}</span>
                {STATUS_KO[a.status] && (
                  <span className={"epa-status st-" + a.status}>{STATUS_KO[a.status]}</span>
                )}
              </div>
            ))}
          </div>
        ) : (
          ev.people.length > 0 && (
            <div className="epop-row">
              <Icon name="users" /> {ev.people.join(", ")}
            </div>
          )
        )}
        {ev.attendees.length > 0 && (
          <div className="epop-rsvp">
            <span className="rsvp-label">내 응답</span>
            {(["accepted", "tentative", "declined"] as const).map((st) => (
              <button
                key={st}
                className={"rsvp-btn st-" + st + (ev.response_status === st ? " on" : "")}
                onClick={() => onRsvp(ev, st)}
              >
                {STATUS_KO[st]}
              </button>
            ))}
          </div>
        )}
        {ev.note && <div className="epop-note">{ev.note}</div>}
        {ev.actions.length > 0 && (
          <div className="epop-actions">
            <div className="epa-head">
              <Icon name="spark" />
              내가 맡기로 한 일<span className="n">{ev.actions.length}</span>
            </div>
            {ev.actions.map((a, i) => (
              <div className="epa-row" key={i}>
                <span className="epa-check">
                  <Icon name="tick" w={3} />
                </span>
                <span className="epa-text">{a.text}</span>
                <span className="epa-who">{a.when}</span>
              </div>
            ))}
            <button
              className={"epa-add" + (addState === "done" ? " done" : "")}
              onClick={addToTasks}
              disabled={addState === "busy" || addState === "done"}
            >
              <Icon name="check" />
              {addState === "done"
                ? "작업에 추가됨"
                : addState === "busy"
                  ? "추가 중…"
                  : addState === "error"
                    ? "다시 시도"
                    : "내 작업에 추가"}
            </button>
          </div>
        )}
        {ev.has_meeting && (
          <button className="meet-open" onClick={() => onMeet(ev)}>
            <Icon name="spark" />
            {ev.meet_label}
          </button>
        )}
        <div className="epop-acts">
          <button className="edit" onClick={() => onEdit(ev)}>
            <Icon name="pen" /> 편집
          </button>
          <button className="del" aria-label="삭제" onClick={() => onDelete(ev)}>
            <Icon name="trash" />
          </button>
        </div>
      </div>
    </>
  );
}