"use client";

import { useEffect, useMemo, useRef, useState } from "react";

type Step = "home" | "identity" | "weigh" | "result" | "settings";
type Unit = "kg" | "g" | "lb";
type Material = {
  id: string;
  name: string;
  tone: string;
  icon: string;
};

const materials: Material[] = [
  { id: "SCRAP_CU_01", name: "废铜", tone: "copper", icon: "Cu" },
  { id: "SCRAP_WIRE_02", name: "废电线", tone: "wire", icon: "⚡" },
  { id: "SCRAP_AL_03", name: "废铝", tone: "aluminum", icon: "Al" },
  { id: "SCRAP_SN_04", name: "废锡", tone: "tin", icon: "Sn" },
];

const machines = ["A01 绕线机", "A02 押出机", "B03 裁线机", "B06 编织机", "C12 包装机"];

const unitFactors: Record<Unit, number> = { kg: 1, g: 1000, lb: 2.20462262 };

function formatWeight(valueKg: number, unit: Unit) {
  const value = Math.max(0, valueKg) * unitFactors[unit];
  const digits = unit === "g" ? 0 : 3;
  return value.toFixed(digits);
}

export default function Home() {
  const [step, setStep] = useState<Step>("home");
  const [employee, setEmployee] = useState({ name: "", id: "" });
  const [machineQuery, setMachineQuery] = useState("");
  const [machine, setMachine] = useState("");
  const [loading, setLoading] = useState(false);
  const [notice, setNotice] = useState("");
  const [unit, setUnit] = useState<Unit>("kg");
  const [rawWeight, setRawWeight] = useState(0);
  const [zeroOffset, setZeroOffset] = useState(0);
  const [tare, setTare] = useState(0);
  const [totalKg, setTotalKg] = useState(0);
  const [material, setMaterial] = useState<Material>(materials[0]);
  const [stable, setStable] = useState(false);
  const [stableProgress, setStableProgress] = useState(0);
  const [countdown, setCountdown] = useState(10);
  const [passwordOpen, setPasswordOpen] = useState(false);
  const [password, setPassword] = useState("");
  const [passwordError, setPasswordError] = useState("");
  const [apiSettings, setApiSettings] = useState({
    employee: "",
    machines: "",
    weight: "",
    upload: "",
  });
  const stableSamples = useRef<number[]>([]);

  const netWeight = Math.max(0, rawWeight - zeroOffset - tare);
  const displayedWeight = totalKg + netWeight;

  const filteredMachines = useMemo(
    () =>
      machines.filter((item) =>
        item.toLowerCase().includes(machineQuery.trim().toLowerCase()),
      ),
    [machineQuery],
  );

  useEffect(() => {
    if (step !== "weigh") return;
    const start = Date.now();
    const timer = window.setInterval(() => {
      const elapsed = (Date.now() - start) / 1000;
      const target = elapsed < 1.4 ? 0 : 2.486;
      const movement = elapsed < 3 ? Math.sin(elapsed * 9) * 0.085 : Math.sin(elapsed * 3) * 0.0012;
      setRawWeight(Math.max(0, target + movement));
    }, 180);
    return () => window.clearInterval(timer);
  }, [step]);

  useEffect(() => {
    if (step !== "weigh") return;
    stableSamples.current = [...stableSamples.current.slice(-7), netWeight];
    const samples = stableSamples.current;
    if (samples.length < 6 || netWeight < 0.01) {
      setStable(false);
      setStableProgress(Math.min(85, samples.length * 14));
      return;
    }
    const spread = Math.max(...samples) - Math.min(...samples);
    const isStable = spread < 0.008;
    setStable(isStable);
    setStableProgress(isStable ? 100 : Math.max(25, 90 - spread * 500));
  }, [netWeight, step]);

  useEffect(() => {
    if (step !== "result") return;
    setCountdown(10);
    const timer = window.setInterval(() => {
      setCountdown((value) => {
        if (value <= 1) {
          window.clearInterval(timer);
          resetToHome();
          return 0;
        }
        return value - 1;
      });
    }, 1000);
    return () => window.clearInterval(timer);
  }, [step]);

  function resetToHome() {
    setStep("home");
    setMachine("");
    setMachineQuery("");
    setTotalKg(0);
    setRawWeight(0);
    setZeroOffset(0);
    setTare(0);
    setStable(false);
    stableSamples.current = [];
  }

  async function fetchIdentity() {
    setLoading(true);
    setNotice("");
    try {
      if (apiSettings.employee) {
        const response = await fetch(apiSettings.employee);
        if (!response.ok) throw new Error("接口不可用");
        const data = await response.json();
        setEmployee({ name: data.name, id: data.employeeId });
      } else {
        await new Promise((resolve) => window.setTimeout(resolve, 650));
        setEmployee({ name: "张伟", id: "E-0826" });
        setNotice("当前使用模拟数据，接口接入后将自动切换");
      }
      setStep("identity");
    } catch {
      setNotice("暂时无法连接本地服务器，请点击“重新获取”");
      setStep("identity");
    } finally {
      setLoading(false);
    }
  }

  function enterAdmin() {
    if (password === "888888") {
      setPasswordOpen(false);
      setPassword("");
      setPasswordError("");
      setStep("settings");
    } else {
      setPasswordError("密码不正确，演示密码为 888888");
    }
  }

  async function submitWeight() {
    if (!stable) {
      setNotice("请等待重量稳定后再保存");
      return;
    }
    setLoading(true);
    setNotice("");
    const payload = {
      employeeName: employee.name,
      employeeId: employee.id,
      machineId: machine,
      materialType: material.name,
      materialTypeId: material.id,
      weightKg: Number(displayedWeight.toFixed(3)),
      createdAt: new Date().toISOString(),
    };
    try {
      if (apiSettings.upload) {
        const response = await fetch(apiSettings.upload, {
          method: "POST",
          headers: { "Content-Type": "application/json" },
          body: JSON.stringify(payload),
        });
        if (!response.ok) throw new Error("上传失败");
      } else {
        await new Promise((resolve) => window.setTimeout(resolve, 700));
      }
      setStep("result");
    } catch {
      setNotice("数据上传失败，请检查服务器连接后重试");
    } finally {
      setLoading(false);
    }
  }

  function addToTotal() {
    if (!stable || netWeight <= 0) {
      setNotice("重量稳定后才能累计");
      return;
    }
    setTotalKg((value) => value + netWeight);
    setZeroOffset(rawWeight);
    setTare(0);
    stableSamples.current = [];
    setNotice(`已累计 ${formatWeight(netWeight, unit)} ${unit}，可继续放置下一批`);
  }

  return (
    <main className="app-shell">
      <div className="ambient ambient-one" />
      <div className="ambient ambient-two" />

      <section className="device-frame">
        <header className="app-header">
          <button className="brand" onClick={resetToHome} aria-label="返回首页">
            <span className="brand-mark">W</span>
            <span>
              <strong>智能称重终端</strong>
              <small>WOTE · SMART SCALE</small>
            </span>
          </button>
          <div className="status-pill">
            <span className="status-dot" />
            设备在线
          </div>
        </header>

        {step !== "home" && step !== "settings" && (
          <div className="progress-strip" aria-label="流程进度">
            {["人员确认", "智能称重", "结果上传"].map((label, index) => {
              const activeIndex = step === "identity" ? 0 : step === "weigh" ? 1 : 2;
              return (
                <div className={index <= activeIndex ? "progress-item active" : "progress-item"} key={label}>
                  <span>{index < activeIndex ? "✓" : index + 1}</span>
                  {label}
                </div>
              );
            })}
          </div>
        )}

        <div className="content">
          {step === "home" && (
            <div className="home-view">
              <div className="eyebrow"><span /> 安全 · 精准 · 可追溯</div>
              <h1>废料称重，<br /><em>简单一点。</em></h1>
              <p>自动识别员工信息，稳定采样并上传记录。<br />请确认秤台处于空载状态后开始。</p>
              <button className="primary-cta" onClick={fetchIdentity} disabled={loading}>
                <span className="cta-icon">↗</span>
                <span><strong>{loading ? "正在连接…" : "开始称重"}</strong><small>读取门禁人员信息</small></span>
                <b>→</b>
              </button>
              <button className="admin-link" onClick={() => setPasswordOpen(true)}>⚙ 管理员登录</button>
              <div className="home-stats">
                <span><b>0.001 kg</b>显示精度</span>
                <span><b>连续采样</b>稳定判断</span>
                <span><b>4 种</b>废料分类</span>
              </div>
            </div>
          )}

          {step === "identity" && (
            <div className="panel-view identity-view">
              <div className="section-heading">
                <div>
                  <span className="step-kicker">01 · 人员与机台</span>
                  <h2>确认本次称重信息</h2>
                  <p>人员信息由门禁机自动获取，请选择对应生产机台。</p>
                </div>
                <button className="refresh-button" onClick={fetchIdentity} disabled={loading}>↻ 重新获取</button>
              </div>
              <div className="identity-card">
                <div className="avatar">{employee.name ? employee.name.slice(-1) : "?"}</div>
                <div><small>当前操作员工</small><h3>{employee.name || "未获取"}</h3><p>工号 · {employee.id || "—"}</p></div>
                <span className={employee.name ? "verified" : "verified missing"}>{employee.name ? "✓ 已验证" : "! 待获取"}</span>
              </div>
              <label className="field-label" htmlFor="machine">生产机台号</label>
              <div className="machine-picker">
                <span>⌕</span>
                <input
                  id="machine"
                  value={machineQuery}
                  onChange={(event) => {
                    setMachineQuery(event.target.value);
                    setMachine("");
                  }}
                  placeholder="输入机台号或名称，如 A01"
                  autoComplete="off"
                />
                {machine && <b>✓</b>}
              </div>
              {machineQuery && !machine && (
                <div className="suggestions">
                  {filteredMachines.length ? filteredMachines.map((item) => (
                    <button key={item} onClick={() => { setMachine(item); setMachineQuery(item); }}>
                      <span>▣</span>{item}<small>选择</small>
                    </button>
                  )) : <p>没有匹配机台，可点击“重新获取”同步最新数据</p>}
                </div>
              )}
              <button
                className="full-primary"
                disabled={!employee.name || !machine}
                onClick={() => { setNotice(""); setStep("weigh"); }}
              >
                确认并进入称重 <span>→</span>
              </button>
              {notice && <div className="notice">ⓘ {notice}</div>}
            </div>
          )}

          {step === "weigh" && (
            <div className="weigh-view">
              <div className="weigh-meta">
                <span><small>员工</small><b>{employee.name} · {employee.id}</b></span>
                <span><small>机台</small><b>{machine}</b></span>
                <button onClick={() => setStep("identity")}>修改</button>
              </div>

              <div className="scale-display">
                <div className="display-top">
                  <span className={stable ? "stable-badge ready" : "stable-badge"}>
                    <i /> {stable ? "重量已稳定" : "正在稳定采样"}
                  </span>
                  <div className="unit-switch">
                    {(["kg", "g", "lb"] as Unit[]).map((item) => (
                      <button className={unit === item ? "active" : ""} onClick={() => setUnit(item)} key={item}>{item}</button>
                    ))}
                  </div>
                </div>
                <div className="weight-number">
                  <span>{formatWeight(displayedWeight, unit)}</span><b>{unit}</b>
                </div>
                <div className="stability-track"><span style={{ width: `${stableProgress}%` }} /></div>
                <div className="display-details">
                  <span>净重 <b>{formatWeight(netWeight, unit)} {unit}</b></span>
                  <span>累计 <b>{formatWeight(totalKg, unit)} {unit}</b></span>
                  <span>皮重 <b>{formatWeight(tare, unit)} {unit}</b></span>
                </div>
              </div>

              <div className="scale-tools">
                <button onClick={() => { setZeroOffset(rawWeight); setTare(0); setTotalKg(0); setNotice("秤台已清零"); }}>⟲<span><b>清零</b><small>消除空秤误差</small></span></button>
                <button onClick={() => { setTare(Math.max(0, rawWeight - zeroOffset)); setNotice("已去皮，仅显示净重"); }}>▱<span><b>去皮</b><small>扣除容器重量</small></span></button>
                <button onClick={addToTotal}>＋<span><b>累计</b><small>加入当前重量</small></span></button>
              </div>

              <div className="material-heading"><span><b>选择废料类型</b><small>点击分类后保存称重记录</small></span><em>必选</em></div>
              <div className="material-grid">
                {materials.map((item) => (
                  <button
                    key={item.id}
                    className={`material-card ${item.tone} ${material.id === item.id ? "selected" : ""}`}
                    onClick={() => setMaterial(item)}
                  >
                    <span className="material-icon">{item.icon}</span>
                    <span><b>{item.name}</b><small>TYPE ID · {item.id}</small></span>
                    <i>{material.id === item.id ? "✓" : "→"}</i>
                  </button>
                ))}
              </div>
              {notice && <div className="notice compact">ⓘ {notice}</div>}
              <button className="full-primary upload" disabled={!stable || loading} onClick={submitWeight}>
                {loading ? "正在上传…" : stable ? `保存 ${material.name} 称重数据` : "请等待重量稳定"} <span>→</span>
              </button>
            </div>
          )}

          {step === "result" && (
            <div className="result-view">
              <div className="success-ring"><span>✓</span></div>
              <span className="step-kicker">称重完成</span>
              <h2>数据已保存</h2>
              <p>本次称重记录已进入上传队列</p>
              <div className="receipt">
                <div className="receipt-head"><span>称重凭证</span><small>{new Date().toLocaleString("zh-CN", { hour12: false })}</small></div>
                <div className="receipt-weight">
                  <span><small>{material.name}</small><b>{formatWeight(displayedWeight, unit)} <em>{unit}</em></b></span>
                  <i>{material.icon}</i>
                </div>
                <dl>
                  <div><dt>员工姓名</dt><dd>{employee.name}</dd></div>
                  <div><dt>员工工号</dt><dd>{employee.id}</dd></div>
                  <div><dt>生产机台</dt><dd>{machine}</dd></div>
                  <div><dt>废料类型 ID</dt><dd>{material.id}</dd></div>
                  <div><dt>上传状态</dt><dd className="upload-ok">● 已保存</dd></div>
                </dl>
              </div>
              <button className="full-primary" onClick={resetToHome}>返回首页 <span>→</span></button>
              <div className="countdown"><span style={{ width: `${countdown * 10}%` }} />{countdown} 秒后自动返回首页</div>
            </div>
          )}

          {step === "settings" && (
            <div className="panel-view settings-view">
              <div className="section-heading">
                <div><span className="step-kicker">管理员中心</span><h2>接口与设备设置</h2><p>接口开发完成后，在此填入本地服务器地址。</p></div>
                <button className="refresh-button" onClick={resetToHome}>退出管理</button>
              </div>
              <div className="settings-card">
                {[
                  ["employee", "人员信息接口", "例如 http://192.168.1.20/api/employee"],
                  ["machines", "机台列表接口", "例如 http://192.168.1.20/api/machines"],
                  ["weight", "电子秤数据接口", "例如 ws://192.168.1.21/weight"],
                  ["upload", "称重上传接口", "例如 http://192.168.1.20/api/records"],
                ].map(([key, label, placeholder]) => (
                  <label key={key}><span>{label}<small>暂未配置</small></span><input value={apiSettings[key as keyof typeof apiSettings]} onChange={(event) => setApiSettings({ ...apiSettings, [key]: event.target.value })} placeholder={placeholder} /></label>
                ))}
              </div>
              <div className="setting-hint">当前为空时，应用会使用内置模拟数据，便于先行演示与验收交互流程。</div>
              <button className="full-primary" onClick={() => { setNotice("设置已保存在本次会话中"); resetToHome(); }}>保存设置 <span>✓</span></button>
            </div>
          )}
        </div>

        <footer><span>沃尔核材 · 数字化生产</span><span>设备编号 SCALE-01 · v1.0</span></footer>
      </section>

      {passwordOpen && (
        <div className="modal-backdrop" onMouseDown={() => setPasswordOpen(false)}>
          <div className="modal" onMouseDown={(event) => event.stopPropagation()}>
            <button className="modal-close" onClick={() => setPasswordOpen(false)}>×</button>
            <span className="modal-icon">⌁</span>
            <h2>管理员登录</h2>
            <p>请输入六位管理密码进入设置</p>
            <input type="password" inputMode="numeric" autoFocus maxLength={6} value={password} onChange={(event) => setPassword(event.target.value.replace(/\D/g, ""))} onKeyDown={(event) => event.key === "Enter" && enterAdmin()} placeholder="••••••" aria-label="管理员密码" />
            {passwordError && <small className="password-error">{passwordError}</small>}
            <button className="full-primary" onClick={enterAdmin}>确认登录 <span>→</span></button>
          </div>
        </div>
      )}
    </main>
  );
}