"use client";
// 回响星核 / Echo Nexus — 记忆图谱（碎片叙事 + v0.15 多层文本）
import { useState, useMemo } from "react";
import { useShallow } from "zustand/react/shallow";
import { useGameStore, FRAGMENTS, nextFragmentThreshold } from "@/store/gameStore";
import { isLoreLayerUnlocked } from "@/lib/game/config";
import { Card } from "@/components/ui/card";
import { ScrollArea } from "@/components/ui/scroll-area";
import { BookOpen, Lock, Sparkles } from "lucide-react";
import type { Fragment, FragmentLoreLayer } from "@/lib/game/types";

const ERA_NAMES = ["", "寂灭前夜", "谐振纪", "飞升潮", "回响纪", "接触纪"];

/** 锁定层用的乱码占位文本（视觉上像被加密的全息碎片） */
const LOCKED_PLACEHOLDER =
  "▓░▒░ ▓▒░▒▓ ░▒▓░ ▒▓░▒░ ▓▒░ ▓░▒░▒ ░▒▓░▒ ▓░▒ ░▒▓░ ▒▓░▒▓░ ▓▒░░▒▓ ░▒▓ ▓░▒▒░ ▓▒░▓░▒ ░▒▓░ ▒▓░▒░ ▓▒░ ░▒▓░";

/** 渲染单层叙事文本（已解锁 / 未解锁两态）。L1=amber / L2=fuchsia */
function LoreLayerBlock({
  layer,
  unlocked,
}: {
  layer: FragmentLoreLayer;
  unlocked: boolean;
}) {
  const isL1 = layer.layer === 1;
  const accentText = isL1 ? "text-amber-300" : "text-fuchsia-300";
  const accentBorder = isL1 ? "border-amber-400/30" : "border-fuchsia-400/30";
  const accentBg = isL1 ? "bg-amber-950/20" : "bg-fuchsia-950/20";
  const accentBody = isL1 ? "text-amber-50/90" : "text-fuchsia-50/90";
  const accentChipBg = isL1 ? "bg-amber-500/15" : "bg-fuchsia-500/15";
  const accentChipText = isL1 ? "text-amber-300" : "text-fuchsia-300";
  const layerTag = isL1 ? "L1" : "L2";

  return (
    <div
      className={`rounded-lg border ${
        unlocked ? accentBorder : "border-white/5"
      } ${unlocked ? accentBg : "bg-black/20"} p-3`}
    >
      <div className="flex items-center justify-between mb-2 gap-2">
        <div className="flex items-center gap-1.5 min-w-0">
          <span
            className={`text-[9px] font-mono px-1.5 py-0.5 rounded shrink-0 ${
              unlocked ? `${accentChipBg} ${accentChipText}` : "bg-white/5 text-muted-foreground/60"
            }`}
          >
            {layerTag}
          </span>
          <span
            className={`text-[11px] font-semibold truncate ${
              unlocked ? accentText : "text-muted-foreground/70"
            }`}
          >
            {unlocked ? layer.title : "???"}
          </span>
        </div>
        {!unlocked && (
          <span className="flex items-center gap-1 text-[10px] text-amber-200/50 shrink-0">
            <Lock className="h-2.5 w-2.5" />
            <span className="font-mono hidden xs:inline sm:inline">{layer.unlockHint}</span>
          </span>
        )}
      </div>

      {unlocked ? (
        <p className={`text-[12px] leading-relaxed italic ${accentBody}`}>
          「{layer.text}」
        </p>
      ) : (
        <p
          className="text-[12px] leading-relaxed blur-sm select-none text-muted-foreground/40 pointer-events-none"
          aria-hidden="true"
        >
          「{LOCKED_PLACEHOLDER}」
        </p>
      )}

      {!unlocked && (
        <div className="mt-2 pt-2 border-t border-white/5 text-[10px] text-amber-200/50">
          <span className="font-mono">🔒 {layer.unlockHint}</span>
        </div>
      )}
    </div>
  );
}

export function Codex() {
  // useShallow 一次性订阅所有判定所需的 state 切片
  const { fragments, totalDecoded, ascensions, contact, bossKills } = useGameStore(
    useShallow((s) => ({
      fragments: s.fragments,
      totalDecoded: s.totalDecoded,
      ascensions: s.ascensions,
      contact: s.contact,
      bossKills: s.bossKills,
    })),
  );
  const nextThreshold = nextFragmentThreshold(totalDecoded);
  const [selected, setSelected] = useState<Fragment | null>(null);

  // v0.1 只展示第一纪元
  const era1 = useMemo(() => FRAGMENTS.filter((f) => f.era === 1), []);
  const unlockedCount = era1.filter((f) => fragments[f.id]).length;

  // 用于判定解锁的快照对象（结构匹配 isLoreLayerUnlocked 的 Pick）
  const stateSnapshot = {
    ascensions,
    totalDecoded,
    contact,
    fragments,
    bossKills,
  };

  // 深层叙事统计：所有 loreLayer 中已解锁数 / 总数
  const loreStats = useMemo(() => {
    let total = 0;
    let unlocked = 0;
    for (const f of era1) {
      if (!f.loreLayers) continue;
      for (const layer of f.loreLayers) {
        total += 1;
        if (isLoreLayerUnlocked(layer.unlock, stateSnapshot)) unlocked += 1;
      }
    }
    return { total, unlocked };
  }, [era1, ascensions, totalDecoded, contact, fragments, bossKills]);

  return (
    <div className="flex flex-col gap-2 h-full">
      <div className="flex items-center justify-between">
        <h3 className="text-sm font-semibold flex items-center gap-1.5">
          <BookOpen className="h-4 w-4 text-fuchsia-400" />
          记忆图谱
        </h3>
        <span className="text-xs text-muted-foreground">
          {unlockedCount}/{era1.length} · 第一纪元
        </span>
      </div>

      {/* v0.15 深层叙事统计 */}
      <div className="flex items-center justify-between text-[10px] px-1">
        <span className="text-muted-foreground/80">深层叙事</span>
        <span className="font-mono">
          <span className="text-amber-300">{loreStats.unlocked}</span>
          <span className="text-muted-foreground/60"> / {loreStats.total} </span>
          <span className="text-muted-foreground/60">已解锁</span>
        </span>
      </div>

      {nextThreshold && (
        <div className="text-[10px] text-muted-foreground/80 px-1">
          再解码 <span className="text-fuchsia-300 font-mono">{nextThreshold - totalDecoded}</span> 颗 → 下一个碎片
        </div>
      )}

      <ScrollArea className="flex-1 min-h-0">
        <div className="grid grid-cols-2 gap-2 pr-2">
          {era1.map((f, i) => {
            const unlocked = !!fragments[f.id];
            // 计算此碎片 L1 / L2 解锁状态（用于标题旁标记）
            const l1Layer = f.loreLayers?.find((l) => l.layer === 1);
            const l2Layer = f.loreLayers?.find((l) => l.layer === 2);
            const l1Unlocked = l1Layer
              ? isLoreLayerUnlocked(l1Layer.unlock, stateSnapshot)
              : false;
            const l2Unlocked = l2Layer
              ? isLoreLayerUnlocked(l2Layer.unlock, stateSnapshot)
              : false;
            const hasDeepUnlocked = l1Unlocked || l2Unlocked;

            return (
              <button
                key={f.id}
                onClick={() => unlocked && setSelected(f)}
                disabled={!unlocked}
                className={`relative aspect-[4/3] rounded-xl border text-left p-2 transition-all duration-300 overflow-hidden ${
                  unlocked
                    ? "border-fuchsia-400/40 bg-gradient-to-br from-fuchsia-950/40 to-black/40 hover:border-fuchsia-400/70 hover:scale-[1.02] cursor-pointer"
                    : "border-white/5 bg-black/30 cursor-not-allowed"
                }`}
                style={
                  unlocked
                    ? { boxShadow: "0 0 16px rgba(232,121,249,0.15)" }
                    : undefined
                }
              >
                {/* 编号 */}
                <span
                  className={`absolute top-1.5 right-1.5 text-[9px] font-mono ${
                    unlocked ? "text-fuchsia-300/70" : "text-white/20"
                  }`}
                >
                  {String(i + 1).padStart(2, "0")}
                </span>
                {unlocked ? (
                  <>
                    <div className="absolute -top-3 -right-3 h-12 w-12 rounded-full bg-fuchsia-500/20 blur-xl" />
                    <div className="flex items-center gap-1 mb-1">
                      <Sparkles className="h-3 w-3 text-fuchsia-300" />
                      {hasDeepUnlocked && (
                        <span
                          className="flex items-center gap-0.5"
                          title="此碎片含已解锁的深层文本"
                        >
                          {l1Unlocked && (
                            <span className="inline-block h-1.5 w-1.5 rounded-full bg-amber-400 shadow-[0_0_4px_rgba(251,191,36,0.8)]" />
                          )}
                          {l2Unlocked && (
                            <span className="inline-block h-1.5 w-1.5 rounded-full bg-fuchsia-400 shadow-[0_0_4px_rgba(232,121,249,0.8)]" />
                          )}
                        </span>
                      )}
                    </div>
                    <div className="text-[11px] font-semibold text-fuchsia-100 leading-tight">
                      {f.title}
                    </div>
                    <div className="text-[9px] text-muted-foreground mt-1 line-clamp-2">
                      {f.echo.slice(0, 28)}…
                    </div>
                  </>
                ) : (
                  <div className="flex flex-col items-center justify-center h-full gap-1">
                    <Lock className="h-4 w-4 text-white/20" />
                    <span className="text-[9px] text-white/30">
                      需解码 {f.threshold} 颗
                    </span>
                  </div>
                )}
              </button>
            );
          })}
        </div>
      </ScrollArea>

      {/* 详情弹层 — v0.15 分层渲染 */}
      {selected && (
        <div
          className="fixed inset-0 z-50 flex items-center justify-center p-4 bg-black/70 backdrop-blur-sm"
          onClick={() => setSelected(null)}
        >
          <Card
            className="max-w-md w-full max-h-[88vh] overflow-y-auto p-5 bg-gradient-to-br from-fuchsia-950/40 to-black/80 border-fuchsia-400/40 [scrollbar-width:thin] [scrollbar-color:rgba(232,121,249,0.4)_transparent]"
            onClick={(e) => e.stopPropagation()}
            style={{ boxShadow: "0 0 40px rgba(232,121,249,0.25)" }}
          >
            <div className="flex items-center gap-2 mb-3">
              <Sparkles className="h-4 w-4 text-fuchsia-300" />
              <span className="text-[10px] text-fuchsia-300/70 font-mono">
                第 {selected.era} 纪元 · {ERA_NAMES[selected.era] || ""}
              </span>
            </div>
            <h4 className="text-lg font-bold text-fuchsia-100 mb-4">
              {selected.title}
            </h4>

            {/* L0 表层回响（永远显示，emerald 主题） */}
            <div className="rounded-lg border border-emerald-400/30 bg-emerald-950/20 p-3 mb-3">
              <div className="flex items-center gap-1.5 mb-2">
                <span className="text-[9px] font-mono px-1.5 py-0.5 rounded bg-emerald-500/15 text-emerald-300">
                  L0
                </span>
                <span className="text-[11px] font-semibold text-emerald-300">
                  表层回响
                </span>
              </div>
              <p className="text-[12px] leading-relaxed italic text-emerald-50/90">
                「{selected.echo}」
              </p>
            </div>

            {/* L1 / L2 深层叙事（条件渲染，按 layer 升序） */}
            {selected.loreLayers
              ?.slice()
              .sort((a, b) => a.layer - b.layer)
              .map((layer) => {
                const unlocked = isLoreLayerUnlocked(layer.unlock, stateSnapshot);
                return (
                  <div
                    key={`${selected.id}-L${layer.layer}`}
                    className="mt-3 first:mt-0"
                  >
                    <div className="border-t border-white/5 mb-3" />
                    <LoreLayerBlock layer={layer} unlocked={unlocked} />
                  </div>
                );
              })}

            {/* 若该碎片没有 loreLayers */}
            {!selected.loreLayers?.length && (
              <div className="mt-4 pt-3 border-t border-white/5 text-[10px] text-muted-foreground/50 italic">
                此碎片暂无更深层叙事。
              </div>
            )}

            <button
              onClick={() => setSelected(null)}
              className="mt-5 text-xs text-muted-foreground hover:text-foreground transition"
            >
              关闭
            </button>
          </Card>
        </div>
      )}
    </div>
  );
}