import type { EnrichFieldName, IdentityPoolItem, MetadataEnrichOutput } from "@umt/contracts";
import { ExternalLink, LoaderCircle, Sparkles } from "lucide-react";
import { useId, useState } from "react";
import { Link } from "react-router";
import { toast } from "sonner";
import { enrichPosterUrl, useApplyEnrich, useEnrichPool } from "~/api/identity.ts";
import { DetailSection } from "~/components/console/detail-sheet.tsx";
import { consolePath } from "~/components/console/nav.ts";
import { Button } from "~/components/ui/button.tsx";
import { Label } from "~/components/ui/label.tsx";
import { Switch } from "~/components/ui/switch.tsx";
import { errorMessage } from "~/lib/api.ts";
import { ENRICH_FIELD_LABEL, ENRICH_SKIPPED, ENRICH_SOURCE_KIND, EVIDENCE_LEVEL } from "./labels.ts";
import { Chip } from "./parts.tsx";

// META-1 待识别资源 → 元数据补全:先看建议(网页搜索 + 白名单网页 + Agent 抽取,不改作品),再应用(建本地临时作品并关联)。

type Suggestion = NonNullable<MetadataEnrichOutput["suggestion"]>;
type Value = {
  value: unknown;
  sourceUrl: string | null;
  evidenceLevel: string;
  verbatim: boolean;
  sourceKind?: string;
  confidence?: number;
  hosts?: number;
};

const hostOf = (u: string | null) => {
  if (!u) return null;
  try {
    return new URL(u).hostname.replace(/^www\./, "");
  } catch {
    return null;
  }
};

function SourceLink({ url }: { url: string | null }) {
  const host = hostOf(url);
  if (!url || !host) return <span className="text-meta text-muted-foreground">无出处</span>;
  return (
    <a
      href={url}
      target="_blank"
      rel="noreferrer noopener"
      className="inline-flex items-center gap-1 text-meta break-all text-muted-foreground underline-offset-4 hover:text-foreground hover:underline"
    >
      {host}
      <ExternalLink className="h-3 w-3 shrink-0" />
    </a>
  );
}

function valuesOf(s: Suggestion, k: EnrichFieldName): Value[] {
  const v = s.fields[k] as Value | Value[] | null;
  return Array.isArray(v) ? v : v ? [v] : [];
}

function FieldRow({ k, s, enrichmentId }: { k: EnrichFieldName; s: Suggestion; enrichmentId: string }) {
  const vals = valuesOf(s, k);
  if (!vals.length) return null;
  return (
    <li className="flex flex-wrap items-start gap-x-3 gap-y-1 py-2 first:pt-0 last:pb-0">
      <div className="w-16 shrink-0 pt-0.5 text-meta text-muted-foreground">{ENRICH_FIELD_LABEL[k] ?? k}</div>
      <div className="min-w-0 flex-1 basis-48 space-y-1">
        {k === "posterUrl" ? (
          <img
            src={enrichPosterUrl(enrichmentId)}
            alt="海报"
            className="h-32 w-auto rounded-md border border-border object-cover"
            loading="lazy"
          />
        ) : null}
        {vals.map((v, i) => (
          <div key={i} className="min-w-0">
            {k !== "posterUrl" ? <p className="text-sm break-words text-foreground">{String(v.value)}</p> : null}
            <div className="flex flex-wrap items-center gap-1.5">
              <Chip>{EVIDENCE_LEVEL[v.evidenceLevel] ?? v.evidenceLevel}</Chip>
              {v.verbatim ? null : <Chip>智能体归纳</Chip>}
              {v.sourceKind ? <Chip>{ENRICH_SOURCE_KIND[v.sourceKind] ?? v.sourceKind}</Chip> : null}
              {v.confidence !== undefined ? (
                <span className="text-meta tabular-nums text-muted-foreground">
                  置信度 {Math.round(v.confidence * 100)}%{v.hosts && v.hosts > 1 ? ` · ${v.hosts} 个网站` : ""}
                </span>
              ) : null}
              <SourceLink url={v.sourceUrl} />
            </div>
          </div>
        ))}
      </div>
    </li>
  );
}

const FIELDS: EnrichFieldName[] = [
  "title",
  "aliases",
  "year",
  "platform",
  "episodeCount",
  "cast",
  "genre",
  "synopsis",
  "posterUrl",
];

export function EnrichSection({ item }: { item: IdentityPoolItem }) {
  const uid = useId();
  const enrich = useEnrichPool();
  const apply = useApplyEnrich();
  const [out, setOut] = useState<MetadataEnrichOutput | null>(null);
  const [lock, setLock] = useState(false);
  const s = out?.suggestion ?? null;

  const run = async (fresh: boolean) => {
    try {
      const r = await enrich.mutateAsync({ id: item.id, ...(fresh ? { fresh: true } : {}) });
      setOut(r);
      if (r.status === "failed") toast.error(r.error ?? "没有找到可用的信息");
    } catch (err) {
      toast.error(errorMessage(err, "补全失败"));
    }
  };
  const doApply = async (mediaEntityId?: string) => {
    if (!out) return;
    try {
      const r = await apply.mutateAsync({
        id: item.id,
        enrichmentId: out.enrichmentId,
        lock,
        ...(mediaEntityId ? { mediaEntityId } : {}),
      });
      toast.success(r.created ? "已建临时作品并关联" : "已并入已有作品并关联");
      setOut({ ...out, status: "applied", appliedMediaEntityId: r.mediaEntityId });
    } catch (err) {
      toast.error(errorMessage(err, "应用失败"));
    }
  };

  return (
    <DetailSection
      title="元数据补全"
      actions={
        <Button variant="outline" size="sm" disabled={enrich.isPending} onClick={() => run(false)}>
          {enrich.isPending ? <LoaderCircle className="animate-spin" /> : <Sparkles />}
          {out ? "重新载入" : "补全"}
        </Button>
      }
    >
      {!out ? (
        <p className="text-caption text-muted-foreground">
          TMDB 查不到时，按标题搜索网页，从平台和百科页面抽取字段，附出处和置信度。确认后才建作品。
        </p>
      ) : (
        <div className="space-y-3">
          <p className="text-meta text-muted-foreground">
            {out.notice}
            {" · "}
            {out.cached ? "7 天内的缓存结果" : `搜索 ${out.usage.searchCalls} 次，读取网页 ${out.usage.fetchCalls} 次`}
            {s ? ` · ${s.extractor === "model" ? `智能体抽取${s.model ? `（${s.model}）` : ""}` : "规则抽取"}` : ""}
            {` · 今日 ${out.budget.usedToday}/${out.budget.dailyLimit}`}
          </p>
          {out.error ? <p className="text-caption text-warning">{out.error}</p> : null}
          {s ? (
            <ul className="divide-y divide-border/60">
              {FIELDS.map((k) => (
                <FieldRow key={k} k={k} s={s} enrichmentId={out.enrichmentId} />
              ))}
            </ul>
          ) : null}
          {s?.sources.length ? (
            <details className="text-meta text-muted-foreground">
              <summary className="cursor-pointer">搜索到的链接（{s.sources.length}）</summary>
              <ul className="mt-1.5 space-y-1">
                {s.sources.map((x) => (
                  <li key={x.url} className="flex flex-wrap items-center gap-1.5">
                    <SourceLink url={x.url} />
                    <span>
                      {x.fetched ? "已读取" : x.skipped ? (ENRICH_SKIPPED[x.skipped] ?? x.skipped) : "未读取"}
                      {x.snippetUsed ? "，用了搜索摘要" : ""}
                    </span>
                  </li>
                ))}
              </ul>
            </details>
          ) : null}
          {out.appliedMediaEntityId ? (
            <Button asChild variant="outline" size="sm">
              <Link to={consolePath("library", out.appliedMediaEntityId)}>查看作品</Link>
            </Button>
          ) : out.status === "suggested" && s ? (
            <div className="space-y-2">
              <div className="flex items-center gap-2">
                <Switch id={`${uid}-lock`} checked={lock} onCheckedChange={setLock} />
                <Label htmlFor={`${uid}-lock`} className="text-caption">
                  应用的字段同时锁定
                </Label>
              </div>
              {out.existing.length ? (
                <div className="space-y-1.5">
                  <p className="text-caption text-muted-foreground">
                    已有同名作品。点「应用」时年份不冲突的自动并入，也可以指定一个：
                  </p>
                  {out.existing.map((e) => (
                    <div key={e.mediaEntityId} className="flex flex-wrap items-center gap-2">
                      <Link
                        to={consolePath("library", e.mediaEntityId)}
                        className="text-sm underline-offset-4 hover:underline"
                      >
                        {e.title}
                        {e.year ? ` (${e.year})` : ""}
                      </Link>
                      <Button
                        variant="outline"
                        size="sm"
                        disabled={apply.isPending}
                        onClick={() => doApply(e.mediaEntityId)}
                      >
                        并入
                      </Button>
                    </div>
                  ))}
                </div>
              ) : null}
              <div className="flex flex-wrap gap-2">
                <Button size="sm" disabled={apply.isPending} onClick={() => doApply()}>
                  {apply.isPending ? <LoaderCircle className="animate-spin" /> : null}
                  应用
                </Button>
                <Button variant="ghost" size="sm" disabled={enrich.isPending} onClick={() => run(true)}>
                  重新搜索
                </Button>
              </div>
            </div>
          ) : (
            <Button variant="ghost" size="sm" disabled={enrich.isPending} onClick={() => run(true)}>
              重新搜索
            </Button>
          )}
        </div>
      )}
    </DetailSection>
  );
}