import { useState } from "react";
import { DocumentationPage } from "./Documentation";
import { Brand, Icon, navigate, type Route } from "./ui";

export function PublicSite({ route }: { route: Exclude<Route, "console"> }) {
  return (
    <div className="public-site">
      <PublicHeader route={route} />
      {route === "docs" ? <DocumentationPage /> : <HomePage />}
      <PublicFooter />
    </div>
  );
}

function scrollToSection(id: string) {
  document.getElementById(id)?.scrollIntoView({ behavior: "smooth", block: "start" });
}

function PublicHeader({ route }: { route: Exclude<Route, "console"> }) {
  return (
    <header className="public-header">
      <Brand />
      <nav aria-label="主导航">
        <button onClick={() => route === "home" ? scrollToSection("apis") : navigate("home")}>API</button>
        <button className={route === "docs" ? "active" : ""} onClick={() => navigate("docs")}>文档</button>
      </nav>
      <button className="header-console" onClick={() => navigate("console")}>控制台 <Icon name="arrow" size={14} /></button>
    </header>
  );
}

function HomePage() {
  return (
    <main className="home-v2">
      <section className="home-hero">
        <div className="home-hero-copy">
          <h1>车辆数据，按需开放。</h1>
          <p>用统一 API 访问车辆日用氢量与日里程。每次调用受应用、车辆和日期范围约束。</p>
          <div className="home-actions">
            <button className="button home-primary" onClick={() => navigate("docs")}>阅读文档</button>
            <button className="home-text-link" onClick={() => navigate("console")}>进入控制台 <Icon name="arrow" size={16} /></button>
          </div>
        </div>
        <ApiWorkbench />
      </section>

      <section className="fact-rail" aria-label="接口事实">
        <span><b>2</b> 项数据能力</span>
        <span>VIN / 车牌授权</span>
        <span>指定 1–200 辆 / 留空查全部</span>
        <span>Trace ID</span>
      </section>

      <section className="api-directory" id="apis">
        <header className="home-section-heading">
          <span>01</span>
          <h2>可用接口</h2>
        </header>
        <ApiRow mark="H₂" name="车辆日用氢量" path="/api/v1/vehicles/hydrogen-consumption/query" unit="kg" />
        <ApiRow mark="KM" name="车辆日里程" path="/api/v1/vehicles/mileage/query" unit="km" />
      </section>

      <section className="integration-section">
        <header className="home-section-heading">
          <span>02</span>
          <h2>开始接入</h2>
        </header>
        <div className="integration-line">
          {[
            ["01", "获取 AppKey", "创建开放应用并保存一次性展示的 AppKey。"],
            ["02", "授权车辆", "按 VIN 或车牌配置车辆和有效期。"],
            ["03", "调用 API", "按自然日查询数据，并记录 Trace ID。"]
          ].map(([number, title, body]) => (
            <article key={number}>
              <span>{number}</span>
              <div><h3>{title}</h3><p>{body}</p></div>
            </article>
          ))}
        </div>
      </section>

      <section className="docs-call-to-action">
        <div>
          <Icon name="book" size={34} />
          <span><h2>查看完整接口文档</h2><p>请求参数、响应结构、错误码与重试策略。</p></span>
        </div>
        <button onClick={() => navigate("docs")}>打开文档 <Icon name="arrow" size={17} /></button>
      </section>
    </main>
  );
}

type ApiKind = "mileage" | "hydrogen";

const apiExamples: Record<ApiKind, {
  tab: string;
  path: string;
  responseField: string;
  value: string;
  extraResponse?: string;
}> = {
  mileage: {
    tab: "日里程",
    path: "/api/v1/vehicles/mileage/query",
    responseField: "dailyMileageKm",
    value: "215.6",
    extraResponse: `\n    "totalMileageKm": 12345.6,\n    "dataTime": "2026-07-19T23:58:45+08:00",\n    "updatedAt": "2026-07-20T05:10:00+08:00",`
  },
  hydrogen: {
    tab: "日用氢量",
    path: "/api/v1/vehicles/hydrogen-consumption/query",
    responseField: "hydrogenConsumptionKg",
    value: "8.42"
  }
};

function ApiWorkbench() {
  const [kind, setKind] = useState<ApiKind>("mileage");
  const current = apiExamples[kind];
  return (
    <div className="api-workbench">
      <div className="workbench-tabs" role="tablist" aria-label="接口示例">
        {(Object.keys(apiExamples) as ApiKind[]).map((item) => (
          <button
            key={item}
            role="tab"
            aria-selected={kind === item}
            className={kind === item ? "active" : ""}
            onClick={() => setKind(item)}
          >
            {apiExamples[item].tab}
          </button>
        ))}
      </div>
      <div className="workbench-grid">
        <div className="workbench-request">
          <header><b>POST</b><code>{current.path}</code></header>
          <div className="workbench-pane-title">请求</div>
          <label>
            <span>plateNumbers</span>
            <code>["辽A00001", "辽A00002"]</code>
          </label>
          <label>
            <span>date</span>
            <code>"2026-07-19"</code>
          </label>
        </div>
        <div className="workbench-response">
          <header><span>响应</span><b>200 OK</b></header>
          <pre aria-label={`${current.tab}响应示例`}><code>{`{
  "code": "SUCCESS",
  "data": [{
    "plateNumber": "辽A00001",
    "date": "2026-07-19",
    "${current.responseField}": ${current.value},
${current.extraResponse || ""}
    "status": "NORMAL"
  }],
  "traceId": "b7ff5582ab1a4e13"
}`}</code></pre>
        </div>
      </div>
    </div>
  );
}

function ApiRow({ mark, name, path, unit }: { mark: string; name: string; path: string; unit: string }) {
  return (
    <article className="api-directory-row">
      <span className="api-mark">{mark}</span>
      <div className="api-row-main">
        <h3>{name}</h3>
        <p><b>POST</b><code>{path}</code></p>
      </div>
      <div className="api-unit"><small>单位</small><span>{unit}</span></div>
      <button onClick={() => navigate("docs")}>接口说明 <Icon name="arrow" size={17} /></button>
    </article>
  );
}

function PublicFooter() {
  return (
    <footer className="public-footer">
      <Brand compact />
      <nav aria-label="页脚导航">
        <button onClick={() => scrollToSection("apis")}>API</button>
        <button onClick={() => navigate("docs")}>文档</button>
        <button onClick={() => navigate("console")}>控制台</button>
      </nav>
      <span>© 2026 Lingniu Technology</span>
    </footer>
  );
}