import { Pause, Pencil, Play, RefreshCw, RotateCcw, Search } from "lucide-react";
import { useMemo, useState } from "react";
import { Link } from "react-router";
import { toast } from "sonner";
import {
  useRefreshCoverage,
  useSubscription,
  useSubscriptionCoverage,
  useSubscriptionOverviewItem,
} from "~/api/subscriptions.ts";
import { DetailSheet } from "~/components/console/detail-sheet.tsx";
import { ErrorState, LoadingState } from "~/components/console/empty-state.tsx";
import { KvList } from "~/components/console/kv-list.tsx";
import { consolePath } from "~/components/console/nav.ts";
import { useStickyId } from "~/components/console/record-sheet.tsx";
import { StatusBadge } from "~/components/console/status-badge.tsx";
import { SubscriptionMappingSummary } from "~/components/episode-mapping/subscription-summary.tsx";
import { PRIORITY, SEASON_SCOPE, SUB_MODE, SUB_ORIGIN, SUB_STATUS } from "~/components/library/labels.ts";
import { CoverPlaceholder, Panel, relTime, Tone } from "~/components/library/parts.tsx";
import { SlotsPanel } from "~/components/library/subscriptions-slots.tsx";
import { SubscriptionMenu, useSubscriptionOps } from "~/components/subscriptions/actions.tsx";
import {
  CellSheet,
  CoverageLegend,
  CoverageMatrix,
  type SelectedCell,
} from "~/components/subscriptions/coverage-matrix.tsx";
import {
  autoFillText,
  foldNames,
  GROUP_LABEL,
  SUB_KIND_LABEL,
  seasonLabel,
  seasonSlices,
  seasonTitle,
} from "~/components/subscriptions/model.ts";
import { ProgressBlock, SlotBadges } from "~/components/subscriptions/overview-item.tsx";
import { SlotPanel } from "~/components/subscriptions/slot-panel.tsx";
import { SubscriptionFormDialog } from "~/components/subscriptions/subscription-form.tsx";
import { Button } from "~/components/ui/button.tsx";
import { errorMessage } from "~/lib/api.ts";
import { actorText } from "~/lib/labels.ts";
import { cn, formatDateTime } from "~/lib/utils.ts";

// 订阅对比视图(FE-5,docs/design/subscriptions.md §2):季页签 → 集 × 收录版本矩阵;收录版本排序与自动补全;订阅信息。
// 记录抽屉(console-ia.md §9):订阅页上 ?open=<订阅 id> 打开的宽抽屉,不再有独立页。

const TOTAL_SOURCE: Record<string, string> = {
  tmdb: "TMDB",
  injected: "订阅里填写",
  manual: "手动",
  covered_floor: "按已整理",
  previous: "沿用上次",
};

export function SubscriptionSheet({ id, onClose }: { id: string | null; onClose: () => void }) {
  const shown = useStickyId(id);
  return (
    <DetailSheet open={!!id} onOpenChange={(o) => !o && onClose()} width="xl" title={<SheetTitleText id={shown} />}>
      {shown ? <SubscriptionDetail id={shown} /> : null}
    </DetailSheet>
  );
}

function SheetTitleText({ id }: { id: string | null }) {
  const subQ = useSubscription(id ?? undefined);
  const sub = subQ.data;
  return <>{sub?.mediaEntityTitle ?? sub?.titleQuery ?? "订阅"}</>;
}

function SubscriptionDetail({ id }: { id: string }) {
  const subQ = useSubscription(id);
  const sub = subQ.data;
  const itemQ = useSubscriptionOverviewItem(sub);
  const item = itemQ.data;
  const covQ = useSubscriptionCoverage(id);
  const cov = covQ.data;
  const refresh = useRefreshCoverage();
  const ops = useSubscriptionOps();
  const [season, setSeason] = useState(0);
  const [sel, setSel] = useState<SelectedCell | null>(null);
  const [editing, setEditing] = useState(false);

  const seasonTabs = useMemo(() => {
    if (!cov) return [];
    const slices = seasonSlices(cov);
    const any = cov.rows.find((r) => r.slotId === null);
    return cov.seasons.map((s, i) => {
      const sl = slices[i]!;
      const have = any ? any.cells.slice(sl.start, sl.end).filter((c) => c.state === "have").length : 0;
      return {
        title: seasonTitle(s, cov.mediaKind),
        stat: `${have}/${s.totalKnown ? s.total : "?"}`,
        source: s.source ? (TOTAL_SOURCE[s.source] ?? s.source) : null,
        locked: s.locked,
      };
    });
  }, [cov]);

  if (subQ.isPending) return <LoadingState rows={6} />;
  if (subQ.isError || !sub) return <ErrorState plain error={subQ.error} onRetry={() => subQ.refetch()} />;

  const title = sub.mediaEntityTitle ?? item?.mediaEntityTitle ?? sub.titleQuery ?? "订阅";
  const tracking = sub.status === "active" || sub.status === "pending";
  const ended = sub.status === "completed" || sub.status === "cancelled";
  const sLabel = item ? seasonLabel(item) : null;
  const doRefresh = () =>
    refresh.mutate(sub.id, {
      onSuccess: () => toast.success("对比已刷新"),
      onError: (e) => toast.error(errorMessage(e)),
    });
  const seasonIdx = Math.min(season, Math.max(0, (cov?.seasons.length ?? 1) - 1));

  return (
    <>
      <header className="flex flex-wrap items-start gap-4">
        <CoverPlaceholder title={title} kind={sub.mediaKind} className="h-24 w-16 max-sm:hidden" />
        <div className="min-w-0 flex-1 space-y-2">
          <div className="min-w-0">
            <p className="text-caption text-muted-foreground">
              {[item?.year, SUB_KIND_LABEL[sub.mediaKind], sLabel, SUB_MODE[sub.mode]].filter(Boolean).join(" · ")}
            </p>
          </div>
          <div className="flex flex-wrap items-center gap-1.5">
            <Tone v={SUB_STATUS[sub.status]} />
            {item?.group ? <StatusBadge>{GROUP_LABEL[item.group]}</StatusBadge> : null}
            {item?.upgrading ? <StatusBadge tone="warning">洗版中</StatusBadge> : null}
            {item?.awaitingNewSeason ? <StatusBadge tone="success">等待新季</StatusBadge> : null}
            {!sub.mediaEntityId ? <StatusBadge tone="warning">不在媒体库</StatusBadge> : null}
          </div>
          {!sub.mediaEntityId ? (
            <p className="max-w-xl rounded-lg border border-warning/40 bg-warning/10 px-3 py-2 text-caption text-warning">
              只按标题「{sub.titleQuery ?? title}
              」订阅，还没关联到媒体库作品，不会自动搜索和下载。先把作品加入媒体库，再从作品订阅。
            </p>
          ) : null}
          {item ? (
            <div className="grid max-w-xl gap-2">
              <ProgressBlock x={item} />
              <SlotBadges slots={item.slots} max={6} unbound={!sub.mediaEntityId} />
            </div>
          ) : null}
        </div>
        <div className="flex w-full flex-wrap items-center gap-2">
          {tracking && sub.mediaEntityId ? (
            <Button variant="outline" size="sm" onClick={() => ops.search(sub.id)} disabled={ops.pending}>
              <Search />
              立即搜索
            </Button>
          ) : null}
          {!ended ? (
            <Button variant="outline" size="sm" onClick={() => setEditing(true)}>
              <Pencil />
              编辑
            </Button>
          ) : null}
          {tracking ? (
            <Button variant="outline" size="sm" onClick={() => ops.act(sub.id, "pause")} disabled={ops.pending}>
              <Pause />
              暂停
            </Button>
          ) : sub.status === "paused" ? (
            <Button variant="outline" size="sm" onClick={() => ops.act(sub.id, "resume")} disabled={ops.pending}>
              <Play />
              恢复
            </Button>
          ) : (
            <Button variant="outline" size="sm" onClick={() => ops.act(sub.id, "resubscribe")} disabled={ops.pending}>
              <RotateCcw />
              重新订阅
            </Button>
          )}
          <SubscriptionMenu sub={sub} onEdit={() => setEditing(true)} showDetail={false} />
        </div>
      </header>

      <div className="space-y-5">
        <Panel
          title="覆盖对比"
          description={cov ? `按收录版本逐集对比 · 计算于 ${relTime(cov.computedAt)}` : "按收录版本逐集对比"}
          actions={
            <Button variant="outline" size="sm" onClick={doRefresh} disabled={refresh.isPending || !sub.mediaEntityId}>
              <RefreshCw className={cn(refresh.isPending && "animate-spin")} />
              刷新对比
            </Button>
          }
        >
          {!sub.mediaEntityId ? (
            <p className="text-caption text-muted-foreground">作品加入媒体库后才能对比，加入后自动关联到这个订阅。</p>
          ) : covQ.isPending ? (
            <LoadingState rows={3} />
          ) : covQ.isError ? (
            <ErrorState plain error={covQ.error} onRetry={() => covQ.refetch()} />
          ) : !cov || cov.seasons.length === 0 ? (
            <p className="text-caption text-muted-foreground">
              还没有季和集信息。元数据刷新后出现；也可以在编辑里设置总集数。
            </p>
          ) : (
            <div className="space-y-4">
              {cov.seasons.length > 1 || cov.mediaKind !== "movie" ? (
                <div role="tablist" aria-label="季" className="flex gap-1 overflow-x-auto scroll-bleed">
                  {seasonTabs.map((t, i) => (
                    <button
                      key={t.title + i}
                      type="button"
                      role="tab"
                      aria-selected={i === seasonIdx}
                      onClick={() => setSeason(i)}
                      className={cn(
                        "flex shrink-0 cursor-pointer flex-col items-start rounded-lg border px-3 py-1.5 text-left transition-colors duration-micro",
                        i === seasonIdx ? "pill-selected" : "border-transparent hover:bg-foreground/[0.06]",
                      )}
                    >
                      <span className="text-sm font-medium text-foreground">{t.title}</span>
                      <span className="text-meta text-muted-foreground tabular-nums">
                        {t.stat}
                        {t.source ? ` · ${t.source}` : ""}
                        {t.locked ? " · 锁定" : ""}
                      </span>
                    </button>
                  ))}
                </div>
              ) : null}
              <CoverageMatrix cov={cov} seasonIndex={seasonIdx} onSelect={setSel} />
              <CoverageLegend />
            </div>
          )}
        </Panel>

        {sub.mediaEntityId ? <SlotPanel sub={sub} cov={cov} item={item} canFill={tracking} /> : null}

        {sub.mediaEntityId && sub.mediaKind !== "movie" ? (
          <SubscriptionMappingSummary entityId={sub.mediaEntityId} seasonUnitId={sub.seasonUnitId} />
        ) : null}

        <div className="grid gap-5 xl:grid-cols-2">
          <Panel title="订阅信息">
            <KvList
              items={[
                { label: "方式", value: SUB_MODE[sub.mode] },
                ...(sub.mediaKind !== "movie" ? [{ label: "季范围", value: SEASON_SCOPE[sub.seasonScope] }] : []),
                { label: "优先级", value: PRIORITY[sub.priority] },
                { label: "来源", value: SUB_ORIGIN[sub.origin] ?? sub.origin },
                {
                  label: "站点",
                  value: item
                    ? foldNames(
                        item.sites.map((s) => s.name),
                        4,
                      )
                    : null,
                },
                {
                  label: "规则组",
                  value: item
                    ? `${foldNames(
                        item.ruleGroups.map((g) => g.name),
                        4,
                        "未设置",
                      )}${item.defaultRuleGroups && item.ruleGroups.length ? "（未单独设置）" : ""}`
                    : null,
                },
                { label: "自动补全", value: item ? autoFillText(item.autoFill) : null },
                { label: "上次更新", value: item ? formatDateTime(item.lastUpdatedAt) : null },
                {
                  label: "主动搜索",
                  value: sub.lastSearchedAt
                    ? `上次 ${relTime(sub.lastSearchedAt)}${sub.nextSearchAt ? ` · 下次 ${relTime(sub.nextSearchAt)}` : item?.searchEnabled === false ? " · 周期搜索已关" : ""}`
                    : "还没搜索过",
                },
                { label: "状态说明", value: sub.statusReason },
                { label: "创建", value: `${formatDateTime(sub.createdAt)} · ${actorText(sub.createdBy)}`, wide: true },
                ...(sub.mediaEntityId
                  ? [
                      {
                        label: "作品",
                        value: (
                          <Link
                            className="underline-offset-4 hover:underline"
                            to={consolePath("library", sub.mediaEntityId)}
                          >
                            查看作品
                          </Link>
                        ),
                      },
                    ]
                  : []),
              ]}
            />
          </Panel>
          {sub.mediaEntityId ? (
            <Panel title="收录版本规则" description="条件、阶梯与升级；新建的收录版本排在最后">
              <SlotsPanel mediaEntityId={sub.mediaEntityId} subscriptionId={sub.id} />
            </Panel>
          ) : null}
        </div>
      </div>

      <CellSheet
        sel={sel}
        subscriptionId={sub.id}
        mediaEntityId={sub.mediaEntityId}
        canFill={tracking}
        onClose={() => setSel(null)}
      />
      {editing ? <SubscriptionFormDialog sub={sub} title={title} onClose={() => setEditing(false)} /> : null}
    </>
  );
}