import {
  type AssetVersion,
  matchGapTexts,
  type SeasonVersions,
  type UnitMatch,
  type VersionSummary,
} from "@umt/contracts";
import { ChevronDown } from "lucide-react";
import { type ReactNode, useState } from "react";
import { useLibraryVersions } from "~/api/library-versions.ts";
import { type KvItem, KvList } from "~/components/console/kv-list.tsx";
import { PaginatedList } from "~/components/console/paginated-list.tsx";
import { RecordLink } from "~/components/console/record-sheet.tsx";
import { TechInfo } from "~/components/console/tech-info.tsx";
import { Panel } from "~/components/library/parts.tsx";
import { cn, formatBytes, formatDateTime } from "~/lib/utils.ts";

// LIBV-1 入库版本:每集一行规格(分辨率 · 来源 · 编码 · HDR · 制作组 · 大小);季头一行汇总。
// POLISH-1:点整行展开,多个版本同级并列,选中的版本下方才显示路径、音轨、字幕、时长;
// 规格来源、探测原始值、比对原文放进 TechInfo;与收录版本的差距用 matchGapTexts 转成人话。

const SOURCE_LABEL: Record<string, string> = {
  REMUX: "Remux",
  "BluRay-Disc": "原盘",
  BluRay: "蓝光压制",
};
const CODEC_LABEL: Record<string, string> = { "H.265": "HEVC" };
const LANG_LABEL: Record<string, string> = {
  "zh-Hans": "简中",
  "zh-Hant": "繁中",
  zh: "中文",
  yue: "粤语",
  en: "英语",
  ja: "日语",
  ko: "韩语",
  fr: "法语",
  de: "德语",
  es: "西语",
};

export const sourceLabel = (s: string | null) => (s ? (SOURCE_LABEL[s] ?? s) : null);
const langLabel = (l: string) => LANG_LABEL[l] ?? l;

/** DV 带 HDR10 兜底时只写 DV */
export function hdrLabel(hdr: readonly string[]): string | null {
  const shown = hdr.includes("DV") ? hdr.filter((h) => h !== "HDR10") : hdr;
  return shown.length ? shown.join("/") : null;
}

/** 一行规格:2160p · WEB-DL · HEVC · DV · FLUX · 13.2 GB */
export function versionParts(v: AssetVersion): string[] {
  return [
    v.resolution,
    sourceLabel(v.source),
    v.videoCodec ? (CODEC_LABEL[v.videoCodec] ?? v.videoCodec) : null,
    hdrLabel(v.hdr),
    v.edition,
    v.releaseGroup,
    v.sizeBytes !== null ? formatBytes(v.sizeBytes, 1) : null,
  ].filter((x): x is string => !!x);
}

/** 季 / 作品汇总:2160p WEB-DL DV ×8 · 1080p 蓝光压制 ×2 · 共 78 GB */
export function summaryText(s: VersionSummary): string {
  const specs = s.specs.map((g) => {
    const label = [g.resolution, sourceLabel(g.source), hdrLabel(g.hdr)].filter(Boolean).join(" ") || "规格未知";
    return s.specs.length > 1 ? `${label} ×${g.count}` : label;
  });
  const shown = specs.length > 2 ? [...specs.slice(0, 2), `等 ${specs.length} 种`] : specs;
  return [...shown, s.sizeBytes ? `共 ${formatBytes(s.sizeBytes, 1)}` : null].filter(Boolean).join(" · ");
}

export function seasonLine(s: SeasonVersions, withMatch = true): string | null {
  if (s.summary.versionCount === 0) return null;
  const count = `${s.episodesWithVersion}/${s.episodeTotal ?? "?"} 集`;
  const up = withMatch && s.matchCounts?.upgradeable ? `${s.matchCounts.upgradeable} 集可升级` : null;
  return [count, summaryText(s.summary), up].filter(Boolean).join(" · ");
}

function audioText(v: AssetVersion): string | null {
  if (!v.audio.length) return null;
  return v.audio
    .map((a) => [a.codec, a.channels, a.language ? langLabel(a.language) : null].filter(Boolean).join(" "))
    .join("；");
}

function duration(sec: number | null): string | null {
  if (!sec) return null;
  const h = Math.floor(sec / 3600);
  const m = Math.round((sec % 3600) / 60);
  return h ? `${h} 小时 ${m} 分钟` : `${m} 分钟`;
}

const SPEC_FROM: Record<string, string> = { name: "文件名", probe: "ffprobe" };

/** 与收录版本的差距 → 人话短句("可换成 2160p"、"缺 HDR 版本");原文留给技术信息 */
export function gapLine(match: UnitMatch | undefined): string | null {
  if (match?.state !== "upgradeable") return null;
  const texts = matchGapTexts(match.codes);
  return texts.length ? texts.join(" · ") : "还有更好的版本可换";
}

/** 选中版本的详情:路径、音轨、字幕、时长;规格来源、探测原始值、比对原文进「技术信息」 */
function VersionDetail({ v, match }: { v: AssetVersion; match?: UnitMatch | undefined }) {
  const items: KvItem[] = [
    { label: "文件", value: v.absolutePath ?? v.relativePath ?? v.fileName, mono: true, wide: true },
    { label: "音轨", value: audioText(v) },
    { label: "字幕", value: v.subtitleLanguages.map(langLabel).join("、") || null },
    { label: "时长", value: duration(v.durationSec) },
    { label: "色深", value: v.bitDepth ? `${v.bitDepth} bit` : null },
    { label: "整理时间", value: formatDateTime(v.organizedAt) },
    {
      label: "下载任务",
      value: v.downloadTaskId ? (
        <RecordLink page="downloads" id={v.downloadTaskId} className="underline-offset-2 hover:underline">
          查看下载任务
        </RecordLink>
      ) : null,
    },
  ].filter((it) => it.value !== null && it.value !== undefined && it.value !== "");
  const ownMatch = match && match.assetId === v.assetId ? match : undefined;
  return (
    <div className="grid gap-2 pt-1 pb-2 pl-2">
      <KvList items={items} />
      <TechInfo
        items={[
          { label: "文件 ID", value: v.assetId, wide: true },
          { label: "规格来源", value: v.specFrom.map((f) => SPEC_FROM[f] ?? f).join(" + ") || null },
          { label: "比对说明", value: ownMatch?.reasons.join("；") || null, wide: true },
          { label: "原因码", value: ownMatch?.codes.join(", ") || null, wide: true },
        ]}
      >
        {v.probe ? (
          <pre className="max-h-64 overflow-auto rounded-lg bg-muted/40 p-2 font-mono text-caption break-all whitespace-pre-wrap text-foreground">
            {JSON.stringify(v.probe, null, 2)}
          </pre>
        ) : null}
      </TechInfo>
    </div>
  );
}

/** 一个版本的规格一行:2160p · WEB-DL · HEVC · DV · FLUX · 13.2 GB + 状态 */
export function VersionSpecLine({ v, best, aside }: { v: AssetVersion; best?: boolean; aside?: ReactNode }) {
  const parts = versionParts(v);
  const missing = v.status === "missing" || (v.locationStatus !== null && v.locationStatus !== "available");
  return (
    <span className="flex min-w-0 flex-1 flex-wrap items-baseline gap-x-1.5 text-caption tabular-nums text-muted-foreground">
      {parts.length ? (
        parts.map((p, i) => (
          <span key={`${i}-${p}`} className={cn("whitespace-nowrap", i === 0 && "font-medium text-foreground")}>
            {i > 0 ? <span className="mr-1.5 text-muted-foreground/60">·</span> : null}
            {p}
          </span>
        ))
      ) : (
        <span className="break-all">{v.fileName}</span>
      )}
      {best ? <span className="text-meta text-success">符合收录版本</span> : null}
      {missing ? <span className="text-meta text-warning">文件不在原位置</span> : null}
      {aside}
    </span>
  );
}

const ROW_CLASS =
  "flex w-full min-w-0 cursor-pointer items-center gap-2 rounded-lg px-2 py-1.5 text-left transition-colors duration-micro hover:bg-foreground/[0.05] focus-visible:ring-2 focus-visible:ring-ring/50 focus-visible:outline-none";

/**
 * 版本列表(POLISH-1):每个版本一行同级并列,点一行选中并在它下方展开详情,再点收起。
 * 电影面板、没对上集数的文件都用它;剧集每集先收成一行,见 EpisodeVersionList。
 */
export function VersionList({
  versions,
  match,
  initial,
  onCollapse,
  compact = false,
}: {
  versions: AssetVersion[];
  match?: UnitMatch | undefined;
  /** 初始选中的版本;缺省不选 */
  initial?: string | null;
  /** 收起选中版本时回调(剧集用来收回到一行) */
  onCollapse?: () => void;
  compact?: boolean;
}) {
  const [selected, setSelected] = useState<string | null>(initial ?? null);
  const tagBest = match?.state === "satisfied" && versions.length > 1;
  return (
    <PaginatedList
      rows={versions}
      as="ul"
      label="已整理文件版本"
      resetKey={match?.assetId ?? "all"}
      compact={compact}
      className="space-y-0.5"
    >
      {(v) => {
        const on = selected === v.assetId;
        return (
          <li key={v.assetId} className={cn("rounded-lg", on && "bg-foreground/[0.04]")}>
            <button
              type="button"
              aria-expanded={on}
              data-version-row
              onClick={() => {
                if (!on) setSelected(v.assetId);
                else if (onCollapse) onCollapse();
                else setSelected(null);
              }}
              className={ROW_CLASS}
            >
              <VersionSpecLine v={v} best={tagBest && v.assetId === match?.assetId} />
              <ChevronDown
                aria-hidden
                className={cn(
                  "size-3.5 shrink-0 text-muted-foreground transition-transform duration-micro",
                  on && "rotate-180",
                )}
              />
            </button>
            {on ? <VersionDetail v={v} match={match} /> : null}
          </li>
        );
      }}
    </PaginatedList>
  );
}

/**
 * 一集的版本:收起时一行(达标或最接近的版本 + "N 个版本"),点整行展开;
 * 展开后每个版本一行同级并列,选中的版本下方显示文件路径、音轨、字幕等。
 * 与收录版本的差距用人话写在下面("可换成 2160p · 缺 HDR 版本")。
 */
export function EpisodeVersionList({
  versions,
  match,
  className,
}: {
  versions: AssetVersion[];
  match?: UnitMatch | undefined;
  className?: string;
}) {
  const [open, setOpen] = useState(false);
  if (!versions.length) return null;
  const lead = versions.find((v) => v.assetId === match?.assetId) ?? versions[0]!;
  const ordered = [lead, ...versions.filter((v) => v !== lead)];
  const gap = gapLine(match);
  return (
    <div className={cn("-mx-2 mt-1 space-y-0.5", className)}>
      {open ? (
        <VersionList
          compact
          versions={ordered}
          match={match}
          initial={lead.assetId}
          onCollapse={() => setOpen(false)}
        />
      ) : (
        <button
          type="button"
          aria-expanded={false}
          data-version-row
          onClick={() => setOpen(true)}
          className={ROW_CLASS}
        >
          <VersionSpecLine
            v={lead}
            aside={
              versions.length > 1 ? (
                <span className="text-meta whitespace-nowrap text-muted-foreground">
                  库里有 {versions.length} 个版本
                </span>
              ) : null
            }
          />
          <ChevronDown aria-hidden className="size-3.5 shrink-0 text-muted-foreground" />
        </button>
      )}
      {gap ? <p className="px-2 text-meta text-warning">{gap}</p> : null}
    </div>
  );
}

/** 电影的入库版本面板:每个文件一行,附与收录版本的比对 */
export function MovieVersionsPanel({ entityId }: { entityId: string }) {
  const q = useLibraryVersions(entityId);
  const data = q.data;
  if (!data?.movie || data.movie.versions.length === 0) return null;
  const match = data.movie.matches?.[0];
  const target = data.targets[0];
  const versions = [...data.movie.versions].sort(
    (a, b) => Number(b.assetId === match?.assetId) - Number(a.assetId === match?.assetId),
  );
  const state = match?.state === "satisfied" ? `符合「${target?.name}」` : gapLine(match);
  return (
    <Panel title="已整理版本" description={[summaryText(data.summary), state].filter(Boolean).join(" · ")}>
      <div className="-mx-2">
        <VersionList versions={versions} match={match} />
      </div>
    </Panel>
  );
}

/** 剧集里没对上具体集数的文件 */
export function UnplacedVersions({ versions }: { versions: AssetVersion[] }) {
  const [open, setOpen] = useState(false);
  if (!versions.length) return null;
  return (
    <div className="mt-3 rounded-xl border border-border/70 px-3 py-2.5">
      <button
        type="button"
        aria-expanded={open}
        onClick={() => setOpen(!open)}
        className="inline-flex w-full cursor-pointer items-center justify-between gap-2 text-left text-caption text-foreground"
      >
        <span>{versions.length} 个文件没对上集数</span>
        <ChevronDown className={cn("size-4 shrink-0 text-muted-foreground", open && "rotate-180")} aria-hidden />
      </button>
      {open ? (
        <div className="-mx-2 mt-2">
          <VersionList versions={versions} />
        </div>
      ) : null}
    </div>
  );
}