"use client";

import { FormEvent, useState } from "react";
import { Globe2, Save, ShieldCheck } from "lucide-react";
import { useRouter } from "next/navigation";

import { Badge } from "@/components/ui/badge";
import { Button } from "@/components/ui/button";
import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card";
import { Input } from "@/components/ui/input";
import type { ApiResult } from "@/modules/core/server/api";
import type { SystemSettings } from "@/modules/core/types";

type GlobalSettingsClientProps = {
  settings: SystemSettings;
};

export function GlobalSettingsClient({ settings }: GlobalSettingsClientProps): React.ReactElement {
  const router = useRouter();
  const [message, setMessage] = useState("");
  const [isPending, setIsPending] = useState(false);

  async function handleSubmit(event: FormEvent<HTMLFormElement>): Promise<void> {
    event.preventDefault();
    setMessage("");
    setIsPending(true);

    const formData = new FormData(event.currentTarget);
    const response = await fetch("/api/settings/global", {
      method: "PATCH",
      headers: { "content-type": "application/json" },
      body: JSON.stringify({
        registrationEnabled: formData.get("registrationEnabled") === "on",
        oidcEnabled: formData.get("oidcEnabled") === "on",
        oidcIssuerUrl: String(formData.get("oidcIssuerUrl") ?? ""),
        oidcClientId: String(formData.get("oidcClientId") ?? ""),
        oidcClientSecret: String(formData.get("oidcClientSecret") ?? ""),
        oidcScopes: String(formData.get("oidcScopes") ?? ""),
        oidcRedirectUri: String(formData.get("oidcRedirectUri") ?? ""),
        oidcAvatarClaim: String(formData.get("oidcAvatarClaim") ?? ""),
        oidcAutoProvision: formData.get("oidcAutoProvision") === "on",
      }),
    });
    const result = (await response.json()) as ApiResult<{ settings: SystemSettings }>;
    setIsPending(false);

    if (!result.success) {
      setMessage(result.reason);
      return;
    }

    setMessage(result.reason);
    router.refresh();
  }

  return (
    <form className="grid gap-5 xl:grid-cols-[0.9fr_1.1fr]" onSubmit={handleSubmit}>
      <Card>
        <CardHeader>
          <div className="flex items-center gap-2">
            <Globe2 className="size-5 text-primary" aria-hidden="true" />
            <CardTitle>注册与入口</CardTitle>
          </div>
          <CardDescription>控制全站公开注册能力和 OIDC 登录入口总开关。</CardDescription>
        </CardHeader>
        <CardContent className="grid gap-4">
          <label className="flex items-center justify-between gap-4 rounded-md border p-3 text-sm">
            <span>
              <span className="block font-medium">开放公开注册</span>
              <span className="block text-xs text-muted-foreground">关闭后普通注册不可用；邀请链接仍可使用。</span>
            </span>
            <input defaultChecked={settings.registrationEnabled} name="registrationEnabled" type="checkbox" />
          </label>

          <label className="flex items-center justify-between gap-4 rounded-md border p-3 text-sm">
            <span>
              <span className="block font-medium">启用 OIDC 登录</span>
              <span className="block text-xs text-muted-foreground">作为平台级总开关，机构级 OIDC 配置仍可单独管理。</span>
            </span>
            <input defaultChecked={settings.oidcEnabled} name="oidcEnabled" type="checkbox" />
          </label>

          <label className="flex items-center justify-between gap-4 rounded-md border p-3 text-sm">
            <span>
              <span className="block font-medium">OIDC 自动开户</span>
              <span className="block text-xs text-muted-foreground">首次 OIDC 登录时按声明信息创建账号，默认进入等待分配。</span>
            </span>
            <input defaultChecked={settings.oidcAutoProvision} name="oidcAutoProvision" type="checkbox" />
          </label>
        </CardContent>
      </Card>

      <Card>
        <CardHeader>
          <div className="flex items-center gap-2">
            <ShieldCheck className="size-5 text-primary" aria-hidden="true" />
            <CardTitle>OIDC 默认配置</CardTitle>
          </div>
          <CardDescription>保存标准 OIDC issuer、client、scope 和头像 claim。</CardDescription>
        </CardHeader>
        <CardContent className="grid gap-4">
          <div className="grid gap-3 md:grid-cols-2">
            <label className="grid gap-2 text-sm">
              <span className="font-medium">Issuer URL</span>
              <Input defaultValue={settings.oidcIssuerUrl} name="oidcIssuerUrl" placeholder="https://idp.example.com" />
            </label>
            <label className="grid gap-2 text-sm">
              <span className="font-medium">Client ID</span>
              <Input defaultValue={settings.oidcClientId} name="oidcClientId" />
            </label>
          </div>

          <label className="grid gap-2 text-sm">
            <span className="font-medium">Client Secret</span>
            <Input
              name="oidcClientSecret"
              placeholder={settings.oidcHasClientSecret ? "已配置，留空则不修改" : "未配置"}
              type="password"
            />
          </label>

          <div className="grid gap-3 md:grid-cols-2">
            <label className="grid gap-2 text-sm">
              <span className="font-medium">Scopes</span>
              <Input defaultValue={settings.oidcScopes} name="oidcScopes" placeholder="openid profile email" />
            </label>
            <label className="grid gap-2 text-sm">
              <span className="font-medium">Redirect URI</span>
              <Input defaultValue={settings.oidcRedirectUri} name="oidcRedirectUri" placeholder="/api/auth/oidc/callback" />
            </label>
          </div>

          <label className="grid gap-2 text-sm">
            <span className="font-medium">Avatar Claim</span>
            <Input defaultValue={settings.oidcAvatarClaim} name="oidcAvatarClaim" placeholder="picture" />
          </label>

          {message ? (
            <p className="rounded-md bg-secondary px-3 py-2 text-sm text-secondary-foreground" role="status">
              {message}
            </p>
          ) : null}

          <div className="flex items-center justify-between gap-3 border-t pt-4">
            <Badge variant={settings.oidcEnabled ? "success" : "secondary"}>
              {settings.oidcEnabled ? "OIDC 已启用" : "OIDC 未启用"}
            </Badge>
            <Button disabled={isPending} type="submit">
              <Save className="size-4" aria-hidden="true" />
              保存配置
            </Button>
          </div>
        </CardContent>
      </Card>
    </form>
  );
}