/* ============================================================
   AUDIO PAGE — Audio Settings
   Design: Reference luxsin_x8_音频设置.png
   Sections:
     - 平衡与灵敏度: 左右平衡 slider, VU灵敏度 slider
     - 输出特性: 滤波特性, 耳机增益, 音量幅度
     - 系统与接口: XLR极性, DAC增益, DAC阻抗
   All list rows → navigate to /select page
   ============================================================ */
import { useDevice } from "@/contexts/DeviceContext";
import { ChevronLeft, ChevronRight } from "lucide-react";
import { useLocation } from "wouter";
import { useState, useEffect, useRef } from "react";
import BottomNav from "@/components/BottomNav";
import { navigateToSelect } from "./SelectPage";
import localeZh from "@/locales/data-zh.json";
import localeZhHK from "@/locales/data-zh-HK.json";
import localeEn from "@/locales/data-en.json";

function CyanSlider({ value, min, max, step = 1, onChange }: {
  value: number; min: number; max: number; step?: number; onChange: (v: number) => void;
}) {
  const fillPct = ((value - min) / (max - min)) * 100;
  return (
    <div className="relative flex items-center w-full mt-2">
      <div className="absolute left-0 h-[4px] rounded-full pointer-events-none"
        style={{ width: `${fillPct}%`, background: "#00FFF6", boxShadow: "0 0 6px rgba(0,255,246,0.5)" }} />
      <input type="range" min={min} max={max} step={step} value={value}
        className="cyan-slider relative z-10"
        onChange={(e) => onChange(Number(e.target.value))} />
    </div>
  );
}

function SectionHeader({ title }: { title: string }) {
  return (
    <div className="px-1 pt-5 pb-2">
      <span className="text-[14px] font-semibold" style={{ color: "#00FFF6" }}>{title}</span>
    </div>
  );
}

function ListRow({ label, value, onClick }: { label: string; value: string; onClick?: () => void }) {
  return (
    <button className="ios-list-row w-full text-left active:bg-white/5 transition-colors" onClick={onClick}>
      <span className="flex-1 text-[16px] text-white">{label}</span>
      <span className="ios-row-value">{value}</span>
      <ChevronRight size={16} className="ios-chevron ml-1" />
    </button>
  );
}

type LocaleDac = {
  dac?: {
    balance?: string;
    sensitivity?: string;
    filters?: { label?: string; options?: Array<{ index: number; label: string }> };
    dacGain?: { label?: string; options?: Array<{ index: number; label: string }> };
    volumeStep?: string;
    xlr?: { label?: string; options?: Array<{ index: number; label: string }> };
    mutePolar?: { label?: string; options?: Array<{ index: number; label: string }> };
    IISMode?: { label?: string; options?: Array<{ index: number; label: string }> };
  };
  home?: { audioSet?: string };
};

const LOCALE_BY_LANG: Record<number, LocaleDac> = {
  0: localeEn as LocaleDac,
  1: localeZhHK as LocaleDac,
  2: localeZh as LocaleDac,
};

function optionLabels(items: Array<{ index: number; label: string }> | undefined, fallback: string[]) {
  if (!items || items.length === 0) return fallback;
  const sorted = [...items].sort((a, b) => a.index - b.index);
  return sorted.map((item) => item.label);
}

const STEP_OPTIONS = ["0.5dB", "1dB", "2dB", "3dB"];

export default function AudioPage() {
  const [, setLocation] = useLocation();
  const { deviceState, updateSetting, refresh, isConnected, api } = useDevice();
  const ds = deviceState;
  const vuSensor = (ds as ({ vuSensor?: number } | null))?.vuSensor;
  const langIdx = ds?.language ?? 2;
  const localeData = LOCALE_BY_LANG[langIdx] ?? (localeZh as LocaleDac);
  const dacText = localeData.dac ?? {};

  // balance 从接口获取的是乘以 10 后的值，需要除以 10 显示（例如：-130 → -13.0）
  const balanceVal = ds?.balance !== undefined ? ds.balance / 10 : 0;
  // vuSensor 从接口获取的是放大 2 倍的值，需要除以 2 显示（例如：20 → +10dB）
  const vuSensVal = vuSensor !== undefined ? vuSensor / 2 : 0;
  const [localBalance, setLocalBalance] = useState(balanceVal);
  const [localVuSens, setLocalVuSens] = useState(0);
  const isBalanceDragging = useRef(false);
  const isVuDragging = useRef(false);

  useEffect(() => { if (!isBalanceDragging.current) setLocalBalance(balanceVal); }, [balanceVal]);
  useEffect(() => { if (!isVuDragging.current) setLocalVuSens(vuSensVal); }, [vuSensVal]);
  useEffect(() => {
    // Ensure we have the latest pcm value from syncData when entering this page
    if (isConnected || api) {
      refresh();
    }
  }, [isConnected, api, refresh]);

  const gainIdx = ds?.dacGain ?? 0;
  const stepIdx = ds?.soundStep ?? 1;
  const filterIdx = ds?.pcm ?? 0;
  const xlrIdx = ds?.xlr ?? 0;
  const mutePolarIdx = (ds as ({ hdmimutepolar?: number } | null))?.hdmimutepolar ?? 0;
  const iisModeIdx = (ds as ({ hdmiType?: number } | null))?.hdmiType ?? 0;

  const FILTER_OPTIONS = optionLabels(dacText.filters?.options, ["快速滚降", "慢速滚降", "短延迟快速滚降", "短延迟慢速滚降", "去重强调", "非过采样（NOS）"]);
  const GAIN_OPTIONS = optionLabels(dacText.dacGain?.options, ["低", "中", "高"]);
  const XLR_OPTIONS = optionLabels(dacText.xlr?.options, ["正常", "反转"]);
  const MUTE_POLAR_OPTIONS = optionLabels(dacText.mutePolar?.options, ["低电平", "高电平"]);
  const IIS_MODE_OPTIONS = optionLabels(dacText.IISMode?.options, ["模式1", "模式2", "模式3", "模式4", "模式5", "模式6", "模式7", "模式8"]);

  const goSelect = (title: string, options: string[], selected: number, key: string) => {
    navigateToSelect(title, options, selected, "/audio", key);
    setLocation("/select");
  };

  return (
    <div className="min-h-screen bg-black">
      <div className="page-header">
        <button onClick={() => setLocation("/")} className="mr-4 text-white/60 active:text-white transition-colors">
          <ChevronLeft size={24} />
        </button>
        <h1 className="flex-1 text-center text-[17px] font-semibold text-white">
          {localeData.home?.audioSet ?? "音频设置"}
        </h1>
        <div className="w-8" />
      </div>

      <div className="px-4 pb-32">
        {/* ── 平衡与灵敏度 ── */}
        <SectionHeader title="平衡与灵敏度" />
        <div className="ios-list-group px-4 py-3 space-y-4">
          <div>
            <div className="flex items-center justify-between">
              <span className="text-[16px] text-white">{dacText.balance ?? "左右平衡"}</span>
              <span className="text-[16px] font-semibold" style={{ color: "#00FFF6" }}>
                {localBalance >= 0 ? `+${localBalance.toFixed(1)}` : localBalance.toFixed(1)} dB
              </span>
            </div>
            <CyanSlider value={localBalance} min={-15} max={15} step={0.1}
              onChange={(v) => {
                isBalanceDragging.current = true;
                setLocalBalance(v);
                // 实时调用接口（例如：-13.0 → -130）
                updateSetting({ balance: Math.round(v * 10) });
                setTimeout(() => { isBalanceDragging.current = false; }, 500);
              }} />
          </div>
          <div className="border-t border-white/[0.06]" />
          <div>
            <div className="flex items-center justify-between">
              <span className="text-[16px] text-white">{dacText.sensitivity ?? "VU 表灵敏度"}</span>
              <span className="text-[16px] font-semibold" style={{ color: "#00FFF6" }}>
                {localVuSens >= 0 ? `+${localVuSens}` : localVuSens} dB
              </span>
            </div>
            <CyanSlider value={localVuSens} min={-20} max={20}
              onChange={(v) => {
                isVuDragging.current = true;
                setLocalVuSens(v);
                // 接口参数需要将显示值乘以 2（例如：10dB -> vuSensor=20）
                updateSetting({ vuSensor: Math.round(v * 2) });
                setTimeout(() => { isVuDragging.current = false; }, 500);
              }} />
          </div>
        </div>

        {/* ── 输出特性 ── */}
        <SectionHeader title="输出特性" />
        <div className="ios-list-group">
          <ListRow
            label={dacText.filters?.label ?? "滤波特性"}
            value={FILTER_OPTIONS[filterIdx] ?? FILTER_OPTIONS[0] ?? "—"}
            onClick={() => goSelect(dacText.filters?.label ?? "选择滤波特性", FILTER_OPTIONS, filterIdx, "filterCharacteristic")}
          />
          <ListRow
            label={dacText.dacGain?.label ?? "耳机增益"}
            value={GAIN_OPTIONS[gainIdx] ?? GAIN_OPTIONS[0] ?? "—"}
            onClick={() => goSelect(dacText.dacGain?.label ?? "选择耳机增益", GAIN_OPTIONS, gainIdx, "dacGain")}
          />
          <ListRow
            label={dacText.volumeStep ?? "音量幅度"}
            value={STEP_OPTIONS[stepIdx] ?? STEP_OPTIONS[0]}
            onClick={() => goSelect(dacText.volumeStep ?? "选择音量幅度", STEP_OPTIONS, stepIdx, "soundStep")}
          />
        </div>

        {/* ── 系统与接口 ── */}
        <SectionHeader title="系统与接口" />
        <div className="ios-list-group">
          <ListRow
            label={dacText.xlr?.label ?? "XLR 端口极性"}
            value={XLR_OPTIONS[xlrIdx] ?? XLR_OPTIONS[0] ?? "—"}
            onClick={() => goSelect(dacText.xlr?.label ?? "选择 XLR 极性", XLR_OPTIONS, xlrIdx, "xlr")}
          />
          <ListRow
            label={dacText.mutePolar?.label ?? "IIS 静音电平"}
            value={MUTE_POLAR_OPTIONS[mutePolarIdx] ?? MUTE_POLAR_OPTIONS[0] ?? "—"}
            onClick={() => goSelect(dacText.mutePolar?.label ?? "选择 IIS 静音电平", MUTE_POLAR_OPTIONS, mutePolarIdx, "mutePolar")}
          />
          <ListRow
            label={dacText.IISMode?.label ?? "IIS 模式"}
            value={IIS_MODE_OPTIONS[iisModeIdx] ?? IIS_MODE_OPTIONS[0] ?? "—"}
            onClick={() => goSelect(dacText.IISMode?.label ?? "选择 IIS 模式", IIS_MODE_OPTIONS, iisModeIdx, "IISMode")}
          />
        </div>
      </div>

      <BottomNav />
    </div>
  );
}