"use client";

import Link from "next/link";
import { ArrowLeft, ChevronDown } from "lucide-react";
import { Button } from "@/components/ui/button";
import {
  DropdownMenu,
  DropdownMenuContent,
  DropdownMenuItem,
  DropdownMenuLabel,
  DropdownMenuSeparator,
  DropdownMenuTrigger,
} from "@/components/ui/dropdown-menu";
import {
  Select,
  SelectContent,
  SelectGroup,
  SelectItem,
  SelectLabel,
  SelectSeparator,
  SelectTrigger,
  SelectValue,
} from "@/components/ui/select";
import { Separator } from "@/components/ui/separator";
import { ADMIN_SETTINGS_NAV_GROUPS } from "../_lib/settings-navigation";
import type { AdminSettingsNavGroup, AdminSettingsNavItem } from "../_lib/types";
import { cn } from "@/lib/utils";
import { SettingStatusBadge } from "./setting-status-badge";

function getActiveGroup(activeTab: string) {
  return ADMIN_SETTINGS_NAV_GROUPS.find((group) =>
    group.items.some((item) => item.value === activeTab)
  );
}

function getActiveItem(activeTab: string) {
  return ADMIN_SETTINGS_NAV_GROUPS.flatMap((group) => group.items).find(
    (item) => item.value === activeTab
  );
}

function SettingsGroupDropdown({
  activeTab,
  group,
  onTabChange,
}: {
  activeTab: string;
  group: AdminSettingsNavGroup;
  onTabChange: (value: string) => void;
}) {
  const hasActiveTab = group.items.some((item) => item.value === activeTab);

  return (
    <DropdownMenu>
      <DropdownMenuTrigger asChild>
        <Button
          className={cn(
            "h-9 rounded-full border px-3.5 text-sm shadow-none",
            hasActiveTab
              ? "border-foreground/10 bg-foreground text-background hover:bg-foreground/90 hover:text-background dark:border-white/20 dark:bg-white dark:text-black dark:hover:bg-white/90"
              : "border-border/70 bg-background/90 text-muted-foreground hover:bg-background hover:text-foreground"
          )}
          size="sm"
          variant="ghost"
        >
          <span>{group.title}</span>
          <ChevronDown className="h-3.5 w-3.5 opacity-70" />
        </Button>
      </DropdownMenuTrigger>
      <DropdownMenuContent align="start" className="w-80">
        <DropdownMenuLabel className="space-y-1">
          <div>{group.title}</div>
          <div className="font-normal text-muted-foreground text-xs">
            {group.description}
          </div>
        </DropdownMenuLabel>
        <DropdownMenuSeparator />
        {group.items.map((item) => {
          const Icon = item.icon;
          const itemContent = (
            <>
              <Icon className="h-4 w-4 text-muted-foreground" />
              <div className="min-w-0 flex-1">
                <div className="font-medium text-sm">{item.label}</div>
                <div className="truncate text-muted-foreground text-xs">
                  {item.description}
                </div>
              </div>
              {item.value === activeTab ? (
                <SettingStatusBadge tone="enabled">当前</SettingStatusBadge>
              ) : null}
            </>
          );

          if (item.href) {
            return (
              <DropdownMenuItem asChild key={item.value}>
                <Link href={item.href}>{itemContent}</Link>
              </DropdownMenuItem>
            );
          }

          return (
            <DropdownMenuItem
              key={item.value}
              onSelect={() => onTabChange(item.value)}
            >
              {itemContent}
            </DropdownMenuItem>
          );
        })}
      </DropdownMenuContent>
    </DropdownMenu>
  );
}

function SettingsQuickAction({
  activeTab,
  item,
  onTabChange,
}: {
  activeTab: string;
  item: AdminSettingsNavItem;
  onTabChange: (value: string) => void;
}) {
  const Icon = item.icon;
  const className =
    item.value === activeTab
      ? "border-foreground/10 bg-foreground text-background shadow-sm hover:bg-foreground/90 dark:border-white/20 dark:bg-white dark:text-black dark:hover:bg-white/90"
      : "border-transparent bg-transparent text-muted-foreground hover:border-border/80 hover:bg-background hover:text-foreground";

  if (item.href) {
    return (
      <Button
        asChild
        className={`h-9 shrink-0 gap-2 rounded-full border px-3.5 ${className}`}
        size="sm"
        variant="ghost"
      >
        <Link href={item.href}>
          <Icon className="h-4 w-4" />
          <span>{item.label}</span>
        </Link>
      </Button>
    );
  }

  return (
    <Button
      className={`h-9 shrink-0 gap-2 rounded-full border px-3.5 ${className}`}
      onClick={() => onTabChange(item.value)}
      size="sm"
      variant="ghost"
    >
      <Icon className="h-4 w-4" />
      <span>{item.label}</span>
    </Button>
  );
}

export function AdminSettingsNavigation({
  activeTab,
  onTabChange,
}: {
  activeTab: string;
  onTabChange: (value: string) => void;
}) {
  const activeGroup = getActiveGroup(activeTab);
  const activeItem = getActiveItem(activeTab);
  const ActiveIcon = activeItem?.icon;

  return (
    <div className="rounded-2xl border bg-background px-4 py-3 shadow-sm">
      <div className="flex flex-col gap-2.5">
        <div className="flex flex-col gap-2 lg:flex-row lg:items-center lg:justify-between">
          <div className="min-w-0 space-y-1.5">
            <div className="flex flex-wrap items-center gap-2 text-[11px] text-muted-foreground uppercase tracking-[0.18em]">
              <span className="font-semibold">Admin Console</span>
              {activeGroup ? (
                <>
                  <span className="h-1 w-1 rounded-full bg-border" />
                  <span className="tracking-normal normal-case text-[12px]">
                    {activeGroup.title}
                  </span>
                </>
              ) : null}
            </div>

            <div className="flex flex-wrap items-center gap-x-3 gap-y-2">
              <h1 className="font-semibold text-[26px] leading-none tracking-tight">
                系统设置中心
              </h1>
              {activeItem && ActiveIcon ? (
                <div className="inline-flex min-w-0 items-center gap-2 rounded-full border border-border/70 bg-muted/10 px-2.5 py-1.5">
                  <div className="flex h-5 w-5 shrink-0 items-center justify-center rounded-full bg-background text-muted-foreground shadow-sm">
                    <ActiveIcon className="h-3.5 w-3.5" />
                  </div>
                  <div className="min-w-0">
                    <div className="flex items-center gap-2">
                      <span className="truncate font-medium text-[13px] text-foreground">
                        {activeItem.label}
                      </span>
                      <SettingStatusBadge tone="enabled">当前</SettingStatusBadge>
                    </div>
                  </div>
                </div>
              ) : null}
            </div>
          </div>

          <Button
            asChild
            className="h-8 rounded-full border-border/70 px-3 text-[13px]"
            size="sm"
            variant="outline"
          >
            <Link href="/">
              <ArrowLeft className="h-3.5 w-3.5" />
              返回工作台
            </Link>
          </Button>
        </div>

        <div className="border-border/70 border-t pt-2.5">
          <div className="flex flex-col gap-2 md:hidden">
            <Select onValueChange={onTabChange} value={activeTab}>
              <SelectTrigger className="h-9 border-border/70 bg-background shadow-none">
                <SelectValue placeholder="选择设置项" />
              </SelectTrigger>
              <SelectContent>
                {ADMIN_SETTINGS_NAV_GROUPS.map((group, groupIndex) => (
                  <SelectGroup key={group.title}>
                    <SelectLabel>{group.title}</SelectLabel>
                    {group.items
                      .filter((item) => !item.href)
                      .map((item) => (
                        <SelectItem key={item.value} value={item.value}>
                          {item.label}
                        </SelectItem>
                      ))}
                    {groupIndex < ADMIN_SETTINGS_NAV_GROUPS.length - 1 ? (
                      <SelectSeparator />
                    ) : null}
                  </SelectGroup>
                ))}
              </SelectContent>
            </Select>

            {activeItem ? (
              <p className="truncate text-muted-foreground text-xs">
                {activeItem.description}
              </p>
            ) : null}

            <div className="flex flex-wrap gap-1">
              {(activeGroup?.items ?? []).map((item) => (
                <SettingsQuickAction
                  activeTab={activeTab}
                  item={item}
                  key={item.value}
                  onTabChange={onTabChange}
                />
              ))}
            </div>
          </div>

          <div className="hidden gap-3 md:flex md:items-start">
            <div className="flex shrink-0 items-center gap-2">
              {ADMIN_SETTINGS_NAV_GROUPS.map((group) => (
                <SettingsGroupDropdown
                  activeTab={activeTab}
                  group={group}
                  key={group.title}
                  onTabChange={onTabChange}
                />
              ))}
            </div>

            <Separator className="mt-1 h-6" orientation="vertical" />

            <div className="min-w-0 flex-1">
              <div className="flex min-w-0 items-center gap-1 overflow-x-auto pb-1">
                {(activeGroup?.items ?? []).map((item) => (
                  <SettingsQuickAction
                    activeTab={activeTab}
                    item={item}
                    key={item.value}
                    onTabChange={onTabChange}
                  />
                ))}
              </div>
              {activeItem ? (
                <p className="truncate px-1 pt-1 text-muted-foreground text-xs">
                  {activeItem.description}
                </p>
              ) : null}
            </div>
          </div>
        </div>
      </div>
    </div>
  );
}