import { type DiscoverItem, type DiscoverMatchCandidate, tmdbImageUrl } from "@umt/contracts";
import { ExternalLink, Search } from "lucide-react";
import { type ReactNode, useState } from "react";
import { Link, useNavigate } from "react-router";
import { toast } from "sonner";
import { useDiscoverMatch } from "~/api/discover.ts";
import { consolePath } from "~/components/console/nav.ts";
import { useReleaseSearchLauncher } from "~/components/search/search-sections.tsx";
import { SubscriptionFormDialog } from "~/components/subscriptions/subscription-form.tsx";
import { Button } from "~/components/ui/button.tsx";
import { Dialog, DialogContent, DialogDescription, DialogHeader, DialogTitle } from "~/components/ui/dialog.tsx";
import { errorMessage } from "~/lib/api.ts";
import type { CardAction } from "./discover-card.tsx";
import { itemHref } from "./discover-state.ts";

// 卡片动作:进作品 / 订阅 / 搜索资源。都要先知道对应的作品:本地作品或 TMDB 条目直接用;
// 豆瓣 / bgm 条目先按名称 + 年份匹配 TMDB(服务端记住确定的匹配),不确定时列候选让人选,选中后继续原来的动作。

interface Target {
  title: string;
  year: number | null;
  type: "movie" | "tv";
  tmdbId: string;
  entityId: string | null;
}

const SOURCE_LABEL: Record<string, string> = { douban: "豆瓣", bangumi: "bgm.tv", tmdb: "TMDB" };

export function useDiscoverActions() {
  const navigate = useNavigate();
  const match = useDiscoverMatch();
  const launcher = useReleaseSearchLauncher();
  const [busy, setBusy] = useState<{ key: string; action: CardAction } | null>(null);
  const [picking, setPicking] = useState<{
    item: DiscoverItem;
    action: CardAction;
    candidates: DiscoverMatchCandidate[];
  } | null>(null);
  const [subscribing, setSubscribing] = useState<Target | null>(null);

  const run = (action: CardAction, t: Target) => {
    if (action === "open") {
      navigate(t.entityId ? consolePath("library", t.entityId) : consolePath("media", "tmdb", t.type, t.tmdbId));
    } else if (action === "subscribe") setSubscribing(t);
    else launcher.open({ title: t.title, ref: t.entityId ? `local:${t.entityId}` : `tmdb:${t.type}:${t.tmdbId}` });
  };

  const act = async (item: DiscoverItem, action: CardAction) => {
    const known = item.tmdb;
    if (action === "open") {
      const href = itemHref(item);
      if (href) return navigate(href);
    }
    if (known) {
      return run(action, {
        title: item.title,
        year: item.year,
        type: known.type,
        tmdbId: known.id,
        entityId: item.local?.entityId ?? null,
      });
    }
    setBusy({ key: `${item.source}:${item.id}`, action });
    try {
      const r = await match.mutateAsync(item);
      if (r.match) run(action, { ...r.match, tmdbId: r.match.id, entityId: null });
      else setPicking({ item, action, candidates: r.candidates });
    } catch (err) {
      toast.error(errorMessage(err, "匹配 TMDB 失败"));
    } finally {
      setBusy(null);
    }
  };

  const dialogs: ReactNode = (
    <>
      {picking ? (
        <PickDialog
          item={picking.item}
          candidates={picking.candidates}
          onPick={(c) => {
            setPicking(null);
            run(picking.action, { ...c, tmdbId: c.id, entityId: null });
          }}
          onClose={() => setPicking(null)}
        />
      ) : null}
      {subscribing ? (
        <SubscriptionFormDialog
          initialTarget={
            subscribing.entityId
              ? {
                  kind: "entity",
                  id: subscribing.entityId,
                  title: subscribing.title,
                  year: subscribing.year,
                  mediaKind: subscribing.type === "movie" ? "movie" : "series",
                }
              : {
                  kind: "tmdb",
                  entityType: subscribing.type,
                  externalId: subscribing.tmdbId,
                  title: subscribing.title,
                  year: subscribing.year,
                  mediaKind: subscribing.type === "movie" ? "movie" : "series",
                }
          }
          onClose={() => setSubscribing(null)}
          onCreated={() => toast.success(`已订阅「${subscribing.title}」`)}
        />
      ) : null}
      {launcher.dialog}
    </>
  );

  return {
    act,
    busyOf: (item: DiscoverItem): CardAction | null =>
      busy && busy.key === `${item.source}:${item.id}` ? busy.action : null,
    dialogs,
  };
}

function PickDialog({
  item,
  candidates,
  onPick,
  onClose,
}: {
  item: DiscoverItem;
  candidates: DiscoverMatchCandidate[];
  onPick: (c: DiscoverMatchCandidate) => void;
  onClose: () => void;
}) {
  return (
    <Dialog open onOpenChange={(o) => !o && onClose()}>
      <DialogContent className="sm:max-w-lg">
        <DialogHeader>
          <DialogTitle>选择 TMDB 作品</DialogTitle>
          <DialogDescription>
            「{item.title}」{item.year ? `（${item.year}）` : ""}没能自动确定对应的 TMDB 作品。
          </DialogDescription>
        </DialogHeader>
        {candidates.length ? (
          <ul className="grid gap-2">
            {candidates.map((c) => (
              <li key={`${c.type}:${c.id}`}>
                <button
                  type="button"
                  onClick={() => onPick(c)}
                  className="flex w-full cursor-pointer items-center gap-3 rounded-lg border border-border/70 p-2 text-left hover:border-foreground/40 hover:bg-accent"
                >
                  <span className="h-14 w-10 shrink-0 overflow-hidden rounded-tight bg-muted">
                    {c.posterPath ? (
                      <img
                        src={tmdbImageUrl(c.posterPath, "w92") ?? ""}
                        alt=""
                        loading="lazy"
                        className="h-full w-full object-cover"
                      />
                    ) : null}
                  </span>
                  <span className="min-w-0">
                    <span className="block truncate text-caption font-medium">{c.title}</span>
                    <span className="text-meta text-muted-foreground">
                      {c.type === "movie" ? "电影" : "剧集"} · {c.year ?? "—"}
                    </span>
                  </span>
                </button>
              </li>
            ))}
          </ul>
        ) : (
          <p className="text-caption text-muted-foreground">TMDB 上没有找到相近的作品。</p>
        )}
        <div className="flex flex-wrap gap-2">
          <Button asChild variant="outline" size="sm">
            <Link to={`${consolePath("search")}?q=${encodeURIComponent(item.title)}`} onClick={onClose}>
              <Search />
              按名称搜索
            </Link>
          </Button>
          <Button asChild variant="ghost" size="sm">
            <a href={item.url} target="_blank" rel="noreferrer">
              <ExternalLink />
              {SOURCE_LABEL[item.source] ?? item.source}
            </a>
          </Button>
        </div>
      </DialogContent>
    </Dialog>
  );
}