import type { CandidateBreakdown, TransferRecord } from "../../store";
import { t } from "../../i18n";
import { formatBytes } from "../../utils/format";
import s from "./TransferDetails.module.css";

export interface TransferDetailsProps
{
    record: TransferRecord;
}

// 二级详情面板。常态下被折叠在 TransferRow 末端「详情」之后，仅工程视角访问。
// 排版克制：mono 字号、文本对齐为主，不做花哨可视化。
export function TransferDetails(props: TransferDetailsProps)
{
    const { record: tr } = props;
    const st = tr.iceStats;

    return (
        <div className={s.root}>
            {/* —— 顶部一行 chip：模式 + 状态 + 文件大小 —— */}
            <div className={s.headline}>
                {tr.mode && (
                    <span className={[
                        s.modeBadge,
                        tr.mode === "p2p" ? s.modeP2P : s.modeRelay,
                    ].join(" ")}>
                        {tr.mode === "p2p" ? t("transfer.mode.p2p") : t("transfer.mode.relay")}
                    </span>
                )}
                <KV k="state" v={tr.state} />
                <KV k="size" v={formatBytes(tr.fileSize)} />
                <KV k="started" v={isoSeconds(tr.startedAt)} />
            </div>

            {/* —— ICE 状态 —— */}
            {st && (
                <>
                    <Section title={t("transfer.debug.iceGathering") + " / " + t("transfer.debug.iceConnection")}>
                        <div className={s.kvRow}>
                            <span className={s.k}>{t("transfer.debug.iceGathering")}</span>
                            <span className={s.v}>{st.gathering}</span>
                            <span className={s.k}>{t("transfer.debug.iceConnection")}</span>
                            <span className={s.v}>{st.connection}</span>
                        </div>
                    </Section>

                    {/* —— 候选明细表格 —— */}
                    <Section title="候选">
                        <CandidateTable
                            local={st.candidates.local}
                            remote={st.candidates.remote}
                        />
                    </Section>

                    {/* —— 选中候选对 —— */}
                    <Section title={t("transfer.debug.selectedPair")}>
                        <div className={s.pairRow}>
                            <span className={s.pairLabel}>pair</span>
                            {st.selectedPair ? (
                                <>
                                    <span className={s.pairHas}>{st.selectedPair.local}</span>
                                    <span className={s.pairArrow}>↔</span>
                                    <span className={s.pairHas}>{st.selectedPair.remote}</span>
                                </>
                            ) : (
                                <span className={s.pairNone}>{t("transfer.debug.noPair")}</span>
                            )}
                        </div>
                    </Section>

                    {/* —— DataChannel —— */}
                    {st.dataChannel && (
                        <Section title={t("transfer.debug.dataChannel")}>
                            <div className={s.kvRow}>
                                <span className={s.k}>readyState</span>
                                <span className={s.v}>{st.dataChannel.readyState}</span>
                                <span className={s.k}>buffered</span>
                                <span className={s.v}>{formatBytes(st.dataChannel.bufferedAmount)}</span>
                            </div>
                        </Section>
                    )}
                </>
            )}

            {/* —— phase 当前 —— */}
            {tr.phase && (
                <Section title="阶段">
                    <div className={s.kvRow}>
                        <span className={s.k}>phase</span>
                        <span className={s.v}>{tr.phase}</span>
                        {tr.lastProgressAt && (
                            <>
                                <span className={s.k}>last tick</span>
                                <span className={s.v}>{isoSeconds(Math.floor(tr.lastProgressAt / 1000))}</span>
                            </>
                        )}
                    </div>
                </Section>
            )}
        </div>
    );
}

function Section(props: { title: string; children: React.ReactNode })
{
    return (
        <div className={s.section}>
            <div className={s.sectionTitle}>{props.title}</div>
            {props.children}
        </div>
    );
}

function KV(props: { k: string; v: string | number })
{
    return (
        <span style={{ display: "inline-flex", gap: 4 }}>
            <span className={s.k}>{props.k}</span>
            <span className={s.v}>{props.v}</span>
        </span>
    );
}

interface CandidateTableProps
{
    local:  CandidateBreakdown;
    remote: CandidateBreakdown;
}

function CandidateTable(props: CandidateTableProps)
{
    const { local, remote } = props;
    const cols = [ "host", "mdns", "srflx", "prflx", "relay" ] as const;
    return (
        <div className={s.candTable}>
            <span className={s.candHead}></span>
            {cols.map((c) => <span key={c} className={s.candHead}>{c}</span>)}

            <span className={s.candCell}>本端</span>
            {cols.map((c) => (
                <span
                    key={"l-" + c}
                    className={[ s.candCell, local[c] === 0 ? s.candZero : "" ].join(" ")}
                >
                    {local[c]}
                </span>
            ))}

            <span className={s.candCell}>对端</span>
            {cols.map((c) => (
                <span
                    key={"r-" + c}
                    className={[ s.candCell, remote[c] === 0 ? s.candZero : "" ].join(" ")}
                >
                    {remote[c]}
                </span>
            ))}
        </div>
    );
}

// 把 unix 秒转 "HH:MM:SS" 本地时间，更适合诊断面板对照浏览器日志时间戳。
function isoSeconds(secs: number): string
{
    const d = new Date(secs * 1000);
    if (Number.isNaN(d.getTime())) { return String(secs); }
    return d.toLocaleTimeString(undefined, { hour: "2-digit", minute: "2-digit", second: "2-digit" });
}