"use client";

import { Globe, Loader2, MessageSquare, Save, UserPlus } from "lucide-react";
import { useState } from "react";
import {
  AdminField,
  AdminPageHeader,
  AdminSection,
  AdminSettingRow,
  AdminSwitch,
} from "@/components/admin";
import { apiUpdateSiteSettings, type PublicSettings } from "@/lib/api";
import { toast } from "@/lib/toast";

export default function SettingsAdmin({ initial }: { initial: PublicSettings }) {
  const [siteName, setSiteName] = useState(initial.site_name);
  const [siteDescription, setSiteDescription] = useState(initial.site_description);
  const [allowRegister, setAllowRegister] = useState(initial.allow_register);
  const [allowComments, setAllowComments] = useState(initial.allow_comments !== false);
  const [savedName, setSavedName] = useState(initial.site_name);
  const [savedDesc, setSavedDesc] = useState(initial.site_description);
  const [saving, setSaving] = useState(false);
  const [togglingReg, setTogglingReg] = useState(false);
  const [togglingComments, setTogglingComments] = useState(false);

  const dirty = siteName.trim() !== savedName || siteDescription.trim() !== savedDesc;

  const saveIdentity = async () => {
    if (saving) return;
    const name = siteName.trim();
    if (!name) {
      toast("站点名称不能为空");
      return;
    }
    setSaving(true);
    try {
      const res = await apiUpdateSiteSettings({
        site_name: name,
        site_description: siteDescription.trim(),
      });
      setSiteName(res.site_name);
      setSiteDescription(res.site_description);
      setSavedName(res.site_name);
      setSavedDesc(res.site_description);
      toast("站点信息已保存", "ok");
    } catch (e) {
      toast(e instanceof Error ? e.message : "保存失败");
    } finally {
      setSaving(false);
    }
  };

  const toggleRegister = async () => {
    if (togglingReg) return;
    const next = !allowRegister;
    setTogglingReg(true);
    try {
      const res = await apiUpdateSiteSettings({ allow_register: next });
      setAllowRegister(res.allow_register);
      toast(res.allow_register ? "已开放注册" : "已关闭注册", "ok");
    } catch (e) {
      toast(e instanceof Error ? e.message : "保存失败");
    } finally {
      setTogglingReg(false);
    }
  };

  const toggleComments = async () => {
    if (togglingComments) return;
    const next = !allowComments;
    setTogglingComments(true);
    try {
      const res = await apiUpdateSiteSettings({ allow_comments: next });
      setAllowComments(res.allow_comments);
      toast(res.allow_comments ? "已开放评论" : "已关闭评论", "ok");
    } catch (e) {
      toast(e instanceof Error ? e.message : "保存失败");
    } finally {
      setTogglingComments(false);
    }
  };

  return (
    <div className="max-w-3xl">
      <AdminPageHeader
        icon={Globe}
        title="站点设置"
        description="配置站点名称、简介与注册/评论开关；主题色、代码折叠与动画请到「外观」页调整"
      />

      <div className="flex flex-col gap-4">
        <AdminSection title="基本信息" description="用于页眉品牌、页脚版权与 SEO 元信息">
          <AdminField
            id="site-name"
            className="mb-4"
            label="站点名称"
            maxLength={32}
            value={siteName}
            onChange={setSiteName}
            placeholder="姜十三论坛"
          />

          <AdminField
            id="site-desc"
            className="mb-4"
            label="站点简介"
            as="textarea"
            minHeight="96px"
            maxLength={160}
            value={siteDescription}
            onChange={setSiteDescription}
            placeholder="一句话介绍社区定位…"
          />

          <div className="flex justify-end">
            <button
              type="button"
              className="btn btn-primary btn-sm"
              disabled={!dirty || saving}
              onClick={() => void saveIdentity()}
            >
              {saving ? <Loader2 size={14} className="animate-spin" /> : <Save size={14} />}
              保存基本信息
            </button>
          </div>
        </AdminSection>

        <AdminSettingRow
          title={
            <>
              <UserPlus size={15} /> 开放注册
            </>
          }
          description="关闭后，游客将无法提交注册；已有账号仍可登录。适用于内测或维护期。"
          control={
            <AdminSwitch
              checked={allowRegister}
              disabled={togglingReg}
              onChange={() => void toggleRegister()}
              label="开放注册"
            />
          }
        />

        <AdminSettingRow
          title={
            <>
              <MessageSquare size={15} /> 开放评论
            </>
          }
          description="关闭后前台不展示评论入口、评论数量与已有评论，并提示本站不支持评论。适用于备案审核等合规需要。"
          control={
            <AdminSwitch
              checked={allowComments}
              disabled={togglingComments}
              onChange={() => void toggleComments()}
              label="开放评论"
            />
          }
        />
      </div>
    </div>
  );
}