import type { RuleLayer, RulePreviewResult } from "@umt/contracts";
import { FlaskConical } from "lucide-react";
import { useState } from "react";
import { toast } from "sonner";
import { usePreviewRuleGroup } from "~/api/rules.ts";
import { FilterSelect } from "~/components/console/filter-bar.tsx";
import { StatusBadge } from "~/components/console/status-badge.tsx";
import { Button } from "~/components/ui/button.tsx";
import { Textarea } from "~/components/ui/textarea.tsx";
import { errorMessage } from "~/lib/api.ts";
import { cn } from "~/lib/utils.ts";

// 试算:对最近 N 条已识别资源(或粘贴的标题)跑当前编辑中的规则组,给 pri / 命中层 / 拒绝原因与逐层依据。

const REASON: Record<string, string> = {
  hard_exclude: "命中硬排除",
  "rule.hard_exclude": "命中硬排除",
  no_layer_matched: "一层都没命中",
  "rule.no_layer_matched": "一层都没命中",
};
const reasonText = (r: string) => REASON[r] ?? r;

export type PreviewDraft = { layers: RuleLayer[]; hardExcludes: string[]; ladderRequired: boolean };

export function RulePreviewPanel({
  groupId,
  draft,
  blocked,
}: {
  groupId: string;
  draft: PreviewDraft;
  blocked: string | null;
}) {
  const preview = usePreviewRuleGroup();
  const [limit, setLimit] = useState("");
  const [titles, setTitles] = useState("");
  const [pasting, setPasting] = useState(false);
  const [result, setResult] = useState<RulePreviewResult | null>(null);

  const run = () => {
    const list = titles
      .split("\n")
      .map((t) => t.trim())
      .filter(Boolean)
      .slice(0, 50)
      .map((title) => ({ title }));
    preview.mutate(
      {
        id: groupId,
        ...(pasting && list.length ? { titles: list } : { limit: Number(limit || 50) }),
        draft: { layers: draft.layers, hardExcludes: draft.hardExcludes, ladderRequired: draft.ladderRequired },
      },
      { onSuccess: setResult, onError: (e) => toast.error(errorMessage(e, "试算失败")) },
    );
  };

  return (
    <div className="space-y-3">
      <div className="flex flex-wrap items-center gap-2">
        {pasting ? null : (
          <FilterSelect
            label="样本"
            value={limit}
            onChange={setLimit}
            allLabel="最近 50 条"
            options={[
              { value: "100", label: "最近 100 条" },
              { value: "200", label: "最近 200 条" },
            ]}
          />
        )}
        <Button type="button" variant="ghost" size="sm" onClick={() => setPasting((v) => !v)}>
          {pasting ? "用最近资源" : "粘贴标题"}
        </Button>
        <Button
          type="button"
          size="sm"
          className="ml-auto"
          onClick={run}
          disabled={preview.isPending || !!blocked}
          title={blocked ?? undefined}
        >
          <FlaskConical />
          {preview.isPending ? "试算中…" : "试算"}
        </Button>
      </div>
      {pasting ? (
        <Textarea
          value={titles}
          onChange={(e) => setTitles(e.target.value)}
          placeholder={"每行一个资源标题，最多 50 行\nDune.Part.Two.2024.2160p.UHD.BluRay.REMUX.HDR.DV-FraMeSToR"}
          aria-label="资源标题"
          rows={4}
          className="font-mono text-meta"
        />
      ) : null}
      {blocked ? <p className="text-meta text-muted-foreground">{blocked}，改好后再试算。</p> : null}
      {result ? <PreviewResult result={result} /> : null}
    </div>
  );
}

function PreviewResult({ result }: { result: RulePreviewResult }) {
  const hist = [...result.priHistogram].sort((a, b) => (b.pri ?? -1) - (a.pri ?? -1));
  return (
    <div className="space-y-3">
      <div className="flex flex-wrap items-center gap-2 text-caption tabular-nums">
        <span className="text-muted-foreground">样本 {result.sampleSize} 条</span>
        <StatusBadge tone="success">通过 {result.passed}</StatusBadge>
        <StatusBadge tone={result.rejected ? "destructive" : "neutral"}>拒绝 {result.rejected}</StatusBadge>
        {hist.map((h) => (
          <span key={String(h.pri)} className="text-meta text-muted-foreground">
            {h.pri === null ? "拒绝" : `pri ${h.pri}`} × {h.count}
          </span>
        ))}
      </div>
      {result.items.length === 0 ? (
        <p className="text-meta text-muted-foreground">没有可试算的资源。站点抓到并识别过资源后再试。</p>
      ) : (
        <div className="overflow-x-auto rounded-lg border border-border/70">
          <table className="w-full text-left text-caption">
            <thead>
              <tr className="border-b border-border text-meta text-muted-foreground">
                <th className="px-3 py-2 font-medium">资源</th>
                <th className="px-3 py-2 font-medium whitespace-nowrap">结果</th>
                <th className="hidden px-3 py-2 font-medium sm:table-cell">原因</th>
              </tr>
            </thead>
            <tbody>
              {result.items.map((it, i) => (
                <tr
                  key={`${it.sourceReleaseId ?? it.title}-${i}`}
                  className="border-b border-border/60 align-top last:border-b-0"
                >
                  <td className="max-w-0 px-3 py-2">
                    <p className="break-all text-foreground">{it.title}</p>
                    {it.subtitle ? <p className="line-clamp-1 text-meta text-muted-foreground">{it.subtitle}</p> : null}
                    {it.trace.length ? (
                      <details className="mt-1">
                        <summary className="cursor-pointer text-meta text-muted-foreground hover:text-foreground">
                          依据
                        </summary>
                        <ul className="mt-1 space-y-0.5">
                          {it.trace.map((t, k) => (
                            <li key={k} className="text-meta break-words text-muted-foreground">
                              {t}
                            </li>
                          ))}
                        </ul>
                      </details>
                    ) : null}
                    <p className="mt-1 text-meta text-muted-foreground sm:hidden">
                      {[...it.excludedBy.map((x) => `排除 ${x}`), ...it.reasons.map(reasonText)].join(";")}
                    </p>
                  </td>
                  <td className="px-3 py-2 whitespace-nowrap">
                    {it.passed ? (
                      <StatusBadge tone="success">
                        pri {it.pri}
                        {it.level !== null ? ` · 第 ${it.level + 1} 层` : ""}
                      </StatusBadge>
                    ) : (
                      <StatusBadge tone="destructive">拒绝</StatusBadge>
                    )}
                  </td>
                  <td className={cn("hidden px-3 py-2 text-meta text-muted-foreground sm:table-cell")}>
                    {[...it.excludedBy.map((x) => `排除 ${x}`), ...it.reasons.map(reasonText)].join(";") || "—"}
                  </td>
                </tr>
              ))}
            </tbody>
          </table>
        </div>
      )}
    </div>
  );
}