import type {
  Decision,
  DecisionOption,
  EpisodeMappingPreview,
  EpisodeResolutionView,
  EpisodeResultBrief,
  EpisodeSimulationSummary,
} from "@umt/contracts";
import { BellOff, Bot, Check, PencilLine } from "lucide-react";
import { useId, useState } from "react";
import { Link } from "react-router";
import { toast } from "sonner";
import { useResolveDecision } from "~/api/decisions.ts";
import { useEntityWords, useEpisodeMappingPreview } from "~/api/episode-mapping.ts";
import { ConfirmDialog } from "~/components/console/confirm-dialog.tsx";
import { consolePath } from "~/components/console/nav.ts";
import { Button } from "~/components/ui/button.tsx";
import { Switch } from "~/components/ui/switch.tsx";
import { errorMessage } from "~/lib/api.ts";
import { canonicalText, episodeCode, mappingHref, scopeText, sourceText } from "./model.ts";

// 作品页集数映射里的「集数待确认」(episode_mapping 内部事项):来源季集、原因、建议的那一行作品识别词与它的模拟结果;
// 操作「采用」(把这一行写进作品识别词并重算)、「修改」(把这一行放进编辑器草稿)、「忽略」(可同时写一行忽略)。
// 智能体建议(批次 5):后台调查没有写规则的授权时,把模拟通过的那一行和理由留在事项上,「采用智能体建议」写进去
// (服务端写之前按当前资源再模拟一次)。

export const EPISODE_CONFIRM_KEY = "confirm_suggestion";
export const EPISODE_CONFIRM_AGENT_KEY = "confirm_agent_suggestion";
export const EPISODE_IGNORE_RULE_KEY = "ignore_rule";

export interface AgentSuggestion {
  line: string;
  reasons: string[];
  simulation: EpisodeSimulationSummary;
  samples: { title: string; source: EpisodeResolutionView["source"]; after: EpisodeResultBrief }[];
}

interface Suggestion {
  expression: string;
  targetSeason: number;
  samples: { source: { start: number; end: number }; target: { season: number; episode: number }; airDate: string }[];
}

export interface EpisodeDecisionView {
  entityId: string | null;
  season: number | null;
  releaseGroup: string | null;
  releases: { id: string; title: string; source: string }[];
  count: number;
  suggestion: Suggestion | null;
  /** 采用建议规则时写进作品识别词的那一行 */
  suggestionLine: string | null;
  agentSuggestion: AgentSuggestion | null;
  confirm: DecisionOption | null;
  confirmAgent: DecisionOption | null;
  ignoreRule: DecisionOption | null;
}

const UUID = /^[0-9a-f-]{36}$/;

/** 从事项证据里取界面要的字段(后端 writeEpisodeDecision 写入的结构) */
export function episodeDecisionView(d: Decision): EpisodeDecisionView {
  const e = d.evidence as Record<string, unknown>;
  const entity = typeof e.mediaEntityId === "string" && UUID.test(e.mediaEntityId) ? e.mediaEntityId : null;
  const releases = Array.isArray(e.releases)
    ? (e.releases as { sourceReleaseId?: string; title?: string; source?: EpisodeResolutionView["source"] | null }[])
        .filter((r) => r.sourceReleaseId)
        .map((r) => ({
          id: r.sourceReleaseId!,
          title: r.title ?? "",
          source: r.source ? sourceText({ source: r.source }) : "—",
        }))
    : [];
  const s = e.suggestion as Suggestion | null | undefined;
  const a = e.agentSuggestion as AgentSuggestion | null | undefined;
  return {
    entityId: entity ?? (d.subjectType === "media_entity" ? d.subjectId : null),
    season: typeof e.season === "number" ? e.season : null,
    releaseGroup: typeof e.releaseGroup === "string" ? e.releaseGroup : null,
    releases,
    count: typeof e.count === "number" ? e.count : releases.length,
    suggestion: s && typeof s.expression === "string" ? s : null,
    agentSuggestion:
      typeof a?.line === "string" && a.simulation
        ? {
            ...a,
            reasons: Array.isArray(a.reasons) ? a.reasons : [],
            samples: Array.isArray(a.samples) ? a.samples : [],
          }
        : null,
    suggestionLine: optionLine(d.options.find((o) => o.key === EPISODE_CONFIRM_KEY)),
    confirm: d.options.find((o) => o.key === EPISODE_CONFIRM_KEY) ?? null,
    confirmAgent: d.options.find((o) => o.key === EPISODE_CONFIRM_AGENT_KEY) ?? null,
    ignoreRule: d.options.find((o) => o.key === EPISODE_IGNORE_RULE_KEY) ?? null,
  };
}

const optionLine = (o: DecisionOption | undefined): string | null => {
  const line = (o?.input as { line?: unknown } | undefined)?.line;
  return typeof line === "string" ? line : null;
};

/** 建议规则套用到同季同组近期资源的结果一句话 */
export function simulationText(p: EpisodeMappingPreview | undefined): string | null {
  if (!p) return null;
  const total = p.items.length;
  if (!total) return null;
  const fail = p.items.filter((i) => i.validation === "fail").length;
  return fail ? `套用后 ${total - fail} 条对得上，${fail} 条仍对不上` : `套用后 ${total} 条都对得上`;
}

/** 智能体建议的模拟结果一句话 */
export function agentSimulationText(s: EpisodeSimulationSummary): string {
  const head =
    s.resolved === s.samples ? `模拟：这 ${s.samples} 条都对得上` : `模拟：${s.samples} 条里 ${s.resolved} 条对得上`;
  return `${head}${s.regressions ? `，会影响 ${s.regressions} 条已对上的资源` : "，不影响已对上的资源"}`;
}

/** 智能体建议:规则、理由、模拟结果与样本套用后的季集 */
export function AgentSuggestionBody({ s }: { s: AgentSuggestion }) {
  return (
    <div className="space-y-1">
      <div className="font-mono break-all">{s.line}</div>
      {s.reasons.length ? (
        <ul className="list-disc space-y-0.5 pl-4 text-meta text-muted-foreground">
          {s.reasons.map((r) => (
            <li key={r}>{r}</li>
          ))}
        </ul>
      ) : null}
      <ul className="space-y-0.5 text-meta text-muted-foreground">
        {s.samples.slice(0, 3).map((x) => (
          <li key={x.title} className="font-mono tabular-nums">
            {sourceText({ source: x.source })} → {canonicalText({ ...x.after, special: x.after.special ?? undefined })}
          </li>
        ))}
      </ul>
      <div className="text-meta text-muted-foreground">{agentSimulationText(s.simulation)}</div>
    </div>
  );
}

/** 展示部分(纯渲染,单测直接渲染) */
export function EpisodeDecisionBody({ view, simulation }: { view: EpisodeDecisionView; simulation: string | null }) {
  const shown = view.releases.slice(-5);
  return (
    <dl className="grid gap-1.5 text-caption sm:grid-cols-[5rem_1fr]">
      <dt className="text-muted-foreground">范围</dt>
      <dd className="text-foreground">{scopeText(view.season, view.releaseGroup)}</dd>
      <dt className="text-muted-foreground">来源季集</dt>
      <dd className="min-w-0 text-foreground">
        <ul className="space-y-0.5">
          {shown.map((r) => (
            <li key={r.id} className="break-all">
              <span className="font-mono tabular-nums">{r.source}</span>
              <span className="ml-2 text-meta text-muted-foreground">{r.title}</span>
            </li>
          ))}
          {view.count > shown.length ? (
            <li className="text-meta text-muted-foreground">另有 {view.count - shown.length} 条</li>
          ) : null}
        </ul>
      </dd>
      {view.agentSuggestion ? (
        <>
          <dt className="text-muted-foreground">智能体建议</dt>
          <dd className="min-w-0 text-foreground">
            <AgentSuggestionBody s={view.agentSuggestion} />
          </dd>
        </>
      ) : null}
      <dt className="text-muted-foreground">建议规则</dt>
      <dd className="min-w-0 text-foreground">
        {view.suggestion ? (
          <>
            <span className="font-mono break-all">
              {view.suggestionLine ?? `${view.suggestion.expression} → 第 ${view.suggestion.targetSeason} 季`}
            </span>
            <ul className="mt-0.5 space-y-0.5 text-meta text-muted-foreground">
              {view.suggestion.samples.slice(0, 3).map((s) => (
                <li key={`${s.source.start}-${s.target.episode}`} className="font-mono tabular-nums">
                  E{String(s.source.start).padStart(2, "0")} →{" "}
                  {episodeCode(s.target.season, { start: s.target.episode, end: s.target.episode })}
                  （播出 {s.airDate}）
                </li>
              ))}
            </ul>
            {simulation ? <div className="mt-0.5 text-meta text-muted-foreground">{simulation}</div> : null}
          </>
        ) : (
          <span className="text-muted-foreground">样本不够推出唯一的规则，在上面的作品识别词里手动写</span>
        )}
      </dd>
    </dl>
  );
}

function IgnoreButton({ d, view }: { d: Decision; view: EpisodeDecisionView }) {
  const resolve = useResolveDecision();
  const id = useId();
  const [withRule, setWithRule] = useState(false);
  return (
    <ConfirmDialog
      trigger={
        <Button variant="ghost" size="sm">
          <BellOff />
          忽略
        </Button>
      }
      title="忽略这条事项？"
      description="只关闭提醒，这些资源仍是集数待确认，不会下载和整理；同组出现新的待确认资源时会重新提出。"
      confirmLabel="忽略"
      onConfirm={() =>
        resolve
          .mutateAsync(
            withRule && view.ignoreRule ? { id: d.id, optionKey: view.ignoreRule.key } : { id: d.id, dismiss: true },
          )
          .then(
            () => toast.success(withRule ? "已忽略，并写了忽略规则" : "已忽略"),
            (err) => {
              toast.error(errorMessage(err, "忽略失败"));
              throw err;
            },
          )
      }
    >
      {view.ignoreRule ? (
        <label htmlFor={id} className="flex items-center gap-2 text-caption text-foreground">
          <Switch id={id} checked={withRule} onCheckedChange={setWithRule} />
          同时写一行「{optionLine(view.ignoreRule) ?? "忽略"}」：这些资源以后不参与集数换算
        </label>
      ) : null}
    </ConfirmDialog>
  );
}

/**
 * 集数待确认事项的证据与操作。onEdit 给了(作品页集数映射里)时「修改」把这一行放进编辑器草稿,否则跳到作品页。
 */
export function EpisodeDecision({ d, open, onEdit }: { d: Decision; open: boolean; onEdit?: (line: string) => void }) {
  const view = episodeDecisionView(d);
  const resolve = useResolveDecision();
  const sug = view.suggestion;
  const line = view.suggestionLine;
  const words = useEntityWords(open && line ? view.entityId : null);
  const current = words.data?.block.text.replace(/\n*$/, "") ?? "";
  const preview = useEpisodeMappingPreview(
    view.entityId,
    line
      ? {
          season: view.season,
          releaseGroup: view.releaseGroup,
          words: current ? `${current}\n${line}\n` : `${line}\n`,
          limit: 50,
        }
      : {},
    open && !!line && words.isSuccess,
  );
  const editLine = line ?? optionLine(view.ignoreRule ?? undefined);
  const modifyHref = view.entityId ? mappingHref(consolePath("library", view.entityId), editLine ?? undefined) : null;
  return (
    <div className="space-y-3">
      <EpisodeDecisionBody view={view} simulation={sug ? simulationText(preview.data) : null} />
      {open ? (
        <div className="flex flex-wrap items-center gap-2">
          {view.confirmAgent && view.agentSuggestion ? (
            <ConfirmDialog
              trigger={
                <Button size="sm">
                  <Bot />
                  采用智能体建议
                </Button>
              }
              title="采用智能体建议？"
              description={`${view.confirmAgent.description ?? ""}。写进去之后可以在作品识别词里再改。`}
              confirmLabel="写入并重算"
              onConfirm={() =>
                resolve.mutateAsync({ id: d.id, optionKey: view.confirmAgent!.key }).then(
                  () => toast.success("已写进作品识别词并重算"),
                  (err) => {
                    toast.error(errorMessage(err, "处理失败"));
                    throw err;
                  },
                )
              }
            />
          ) : null}
          {view.confirm ? (
            <ConfirmDialog
              trigger={
                <Button size="sm" variant={view.confirmAgent && view.agentSuggestion ? "outline" : "default"}>
                  <Check />
                  采用建议规则
                </Button>
              }
              title="采用建议规则？"
              description={`${view.confirm.description ?? ""}。写进去之后可以在作品识别词里再改。`}
              confirmLabel="写入并重算"
              onConfirm={() =>
                resolve.mutateAsync({ id: d.id, optionKey: view.confirm!.key }).then(
                  () => toast.success("已写进作品识别词并重算"),
                  (err) => {
                    toast.error(errorMessage(err, "处理失败"));
                    throw err;
                  },
                )
              }
            />
          ) : null}
          {onEdit && editLine ? (
            <Button variant="outline" size="sm" onClick={() => onEdit(editLine)}>
              <PencilLine />
              修改
            </Button>
          ) : modifyHref ? (
            <Button asChild variant="outline" size="sm">
              <Link to={modifyHref}>
                <PencilLine />
                修改
              </Link>
            </Button>
          ) : null}
          <IgnoreButton d={d} view={view} />
        </div>
      ) : null}
    </div>
  );
}