// frontend/components/tasks/Comments.tsx
"use client";
import { useState } from "react";
import { Icon } from "@/components/Icon";
import type { Person, TaskComment } from "@/lib/types";

function relTime(iso: string): string {
  if (!iso) return "방금";
  const then = new Date(iso).getTime();
  if (Number.isNaN(then)) return "방금";
  const diff = Date.now() - then;
  const m = Math.floor(diff / 60000);
  if (m < 1) return "방금";
  if (m < 60) return `${m}분 전`;
  const h = Math.floor(m / 60);
  if (h < 24) return `${h}시간 전`;
  const d = Math.floor(h / 24);
  if (d === 1) return "어제";
  if (d < 7) return `${d}일 전`;
  const dt = new Date(iso);
  return `${dt.getMonth() + 1}/${dt.getDate()}`;
}

export function Comments({
  list,
  people,
  me,
  onAdd,
  onEdit,
  onDelete,
}: {
  list: TaskComment[];
  people: Record<string, Person>;
  me: Person;
  onAdd: (text: string) => void;
  onEdit?: (cid: string, text: string) => void;
  onDelete?: (cid: string) => void;
}) {
  const [txt, setTxt] = useState("");
  const [editId, setEditId] = useState<string | null>(null);
  const [editTxt, setEditTxt] = useState("");
  const submit = () => {
    if (txt.trim()) {
      onAdd(txt.trim());
      setTxt("");
    }
  };
  const startEdit = (c: TaskComment) => {
    setEditId(c.id);
    setEditTxt(c.text);
  };
  const saveEdit = () => {
    if (editId && editTxt.trim()) onEdit?.(editId, editTxt.trim());
    setEditId(null);
    setEditTxt("");
  };
  return (
    <div className="cmt">
      <div className="cmt-list">
        {list.length === 0 && (
          <div className="cmt-empty">아직 코멘트가 없어요. 첫 의견을 남겨보세요.</div>
        )}
        {list.map((c) => {
          const p = people[c.person_id] || me;
          const mine = c.person_id === me.id;
          const editing = editId === c.id;
          return (
            <div className="cmt-row" key={c.id}>
              <div className="av" style={{ background: p.color }}>
                {p.initial}
              </div>
              <div className="cmt-bub">
                <div className="cmt-top">
                  <b>
                    {p.name}
                    {p.is_me ? " (나)" : ""}
                  </b>
                  <span className="t">
                    {relTime(c.created_at)}
                    {c.edited_at ? " · 수정됨" : ""}
                  </span>
                  {mine && onEdit && onDelete && !editing && (
                    <span className="cmt-acts">
                      <button onClick={() => startEdit(c)} aria-label="코멘트 수정">
                        <Icon name="pen" />
                      </button>
                      <button
                        onClick={() => onDelete(c.id)}
                        aria-label="코멘트 삭제"
                        className="danger"
                      >
                        <Icon name="trash" />
                      </button>
                    </span>
                  )}
                </div>
                {editing ? (
                  <div className="cmt-edit">
                    <input
                      value={editTxt}
                      autoFocus
                      onChange={(e) => setEditTxt(e.target.value)}
                      onKeyDown={(e) => {
                        if (e.key === "Enter") saveEdit();
                        if (e.key === "Escape") setEditId(null);
                      }}
                    />
                    <button onClick={saveEdit} disabled={!editTxt.trim()}>
                      저장
                    </button>
                    <button className="ghost" onClick={() => setEditId(null)}>
                      취소
                    </button>
                  </div>
                ) : (
                  <div className="cmt-text">{c.text}</div>
                )}
              </div>
            </div>
          );
        })}
      </div>
      <div className="cmt-compose">
        <div className="av" style={{ background: me.color }}>
          {me.initial}
        </div>
        <input
          value={txt}
          placeholder="코멘트 추가…"
          onChange={(e) => setTxt(e.target.value)}
          onKeyDown={(e) => {
            if (e.key === "Enter") submit();
          }}
        />
        <button className="cmt-send" onClick={submit} disabled={!txt.trim()} aria-label="코멘트 등록">
          <Icon name="send" />
        </button>
      </div>
    </div>
  );
}