// frontend/components/mail/Reader.tsx — 리딩 패널 (툴바 + 본문 + 첨부 + 대화 + AriPanel)
"use client";
import { useEffect, useState } from "react";
import { Icon } from "@/components/Icon";
import { mailApi } from "@/lib/mail/api";
import type { AiReply, Conversation, EmailDetail, MailAccount, Person } from "@/lib/types";
import { AriPanel } from "./AriPanel";
import { MailHtmlBody } from "./MailHtmlBody";

function fmtBytes(n: number): string {
  if (!n) return "";
  if (n < 1024) return `${n} B`;
  if (n < 1024 * 1024) return `${(n / 1024).toFixed(0)} KB`;
  return `${(n / 1024 / 1024).toFixed(1)} MB`;
}

export function Reader({
  m,
  person,
  account,
  added,
  loading,
  onAdd,
  onReply,
  onReplyAll,
  onForward,
  onAddAll,
  onArchive,
  onStar,
  onMarkUnread,
  onDelete,
  onOpenMsg,
}: {
  m: EmailDetail | null;
  person?: Person;
  account?: MailAccount;
  added: Record<string, boolean>;
  loading?: boolean;
  onAdd: (key: string, kind: "task" | "event" | "file", index: number) => void;
  onReply: (m: EmailDetail, replyIndex: number | null, r: AiReply | null) => void;
  onReplyAll: (m: EmailDetail) => void;
  onForward: (m: EmailDetail) => void;
  onAddAll: (m: EmailDetail) => void;
  onArchive: (id: string) => void;
  onStar: (id: string) => void;
  onMarkUnread: (id: string) => void;
  onDelete: (id: string) => void;
  onOpenMsg?: (id: string) => void;
}) {
  const [thread, setThread] = useState<Conversation | null>(null);
  const threadId = m?.thread_id ?? "";
  const mid = m?.id ?? "";
  useEffect(() => {
    setThread(null);
    if (!mid || !threadId) return;
    let live = true;
    mailApi
      .thread(mid)
      .then((t) => live && t.count > 1 && setThread(t))
      .catch(() => {});
    return () => {
      live = false;
    };
  }, [mid, threadId]);
  if (!m) {
    return (
      <div className="reader">
        <div className="rd-empty">
          <div className="e-ico">
            <Icon name="mail" />
          </div>
          <h3>{loading ? "메일을 여는 중…" : "읽을 메일을 선택하세요"}</h3>
          <p>메일을 열면 아리가 내용을 분석해 할 일·일정·답장을 미리 준비해 드려요.</p>
        </div>
      </div>
    );
  }
  const name = person?.name ?? (m.from_name || m.from);
  const initial = person?.initial ?? name.slice(0, 1);
  const color = person?.color ?? "var(--muted)";
  const email = person?.email ?? m.from_email;
  const role = person?.role;
  const accTone = account?.tone ?? "ink";
  const accName = account?.name ?? m.account;
  const accEmail = account?.email ?? "";

  return (
    <div className="reader">
      <div className="rd-toolbar">
        <button className="rd-tool" onClick={() => onReply(m, null, null)}>
          <Icon name="reply" />
          답장
        </button>
        <button className="rd-tool icon-only" aria-label="전체 답장" onClick={() => onReplyAll(m)}>
          <Icon name="replyAll" />
        </button>
        <button className="rd-tool icon-only" aria-label="전달" onClick={() => onForward(m)}>
          <Icon name="forward" />
        </button>
        <div className="rd-spacer" />
        <button className="rd-tool icon-only" aria-label="별표" onClick={() => onStar(m.id)}>
          <Icon name="star" w={m.starred ? 0 : 1.9} fill={m.starred ? "currentColor" : "none"} />
        </button>
        <button
          className="rd-tool icon-only"
          aria-label="안 읽음으로 표시"
          onClick={() => onMarkUnread(m.id)}
        >
          <Icon name="mail" />
        </button>
        <button className="rd-tool icon-only" onClick={() => onArchive(m.id)} aria-label="보관">
          <Icon name="archive" />
        </button>
        <button
          className="rd-tool icon-only danger"
          aria-label="삭제"
          onClick={() => onDelete(m.id)}
        >
          <Icon name="trash" />
        </button>
      </div>
      <div className="rd-scroll" role="region" aria-label="메일 본문" tabIndex={0}>
        <div className="rd-inner">
          <h1 className="rd-subject">{m.subject}</h1>
          <div className="rd-sender">
            <div className="av-lg" style={{ background: color }}>
              {initial}
            </div>
            <div className="who">
              <b>{name}</b> {role && <span className="em">· {role}</span>}
              {email && <div className="em">{email}</div>}
            </div>
            <div className="when">{m.date}</div>
          </div>
          <div className="rd-to">받는 사람: {m.to}</div>
          {m.cc && <div className="rd-to">참조: {m.cc}</div>}
          <div className="rd-acctag">
            <span className="acc-dot" style={{ background: `var(--${accTone})` }} />
            {accName}
            {accEmail ? ` · ${accEmail}` : ""}
          </div>

          <div className="rd-divider" />
          {m.body_html ? (
            <MailHtmlBody html={m.body_html} />
          ) : (
            <div className="rd-body">
              {m.body.map((para, i) => (
                <p key={i}>{para}</p>
              ))}
            </div>
          )}

          {m.attachments && m.attachments.length > 0 && (
            <div className="rd-attachments">
              {m.attachments.map((at, i) =>
                at.id ? (
                  <a
                    className="att-chip"
                    key={i}
                    href={mailApi.attachmentUrl(m.id, at.id)}
                    download={at.name}
                    title={`${at.name} 내려받기`}
                  >
                    <Icon name="file" />
                    <div className="at-meta">
                      <b>{at.name}</b>
                      <span>{fmtBytes(at.size)}</span>
                    </div>
                    <Icon name="down" />
                  </a>
                ) : (
                  <div className="att-chip" key={i}>
                    <Icon name="file" />
                    <div className="at-meta">
                      <b>{at.name}</b>
                      <span>{fmtBytes(at.size)}</span>
                    </div>
                  </div>
                ),
              )}
            </div>
          )}

          {thread && (
            <div className="rd-thread">
              <div className="rd-thread-head">
                <Icon name="mail" />
                대화 {thread.count}통
              </div>
              {thread.messages
                .filter((tm) => tm.id !== m.id)
                .map((tm) => (
                  <button
                    className="rd-thread-msg"
                    key={tm.id}
                    onClick={() => onOpenMsg?.(tm.id)}
                    disabled={!onOpenMsg}
                  >
                    <b className="tm-from">{tm.from}</b>
                    <span className="tm-prev">{tm.preview}</span>
                    <span className="tm-time">{tm.time}</span>
                  </button>
                ))}
            </div>
          )}

          {m.ai && (
            <AriPanel
              m={m}
              added={added}
              onAdd={onAdd}
              onReply={(mail, idx, r) => onReply(mail as EmailDetail, idx, r)}
              onAddAll={(mail) => onAddAll(mail as EmailDetail)}
            />
          )}
        </div>
      </div>
    </div>
  );
}