import type { Metadata } from "next";
import { notFound } from "next/navigation";
import { db, users, recipes, userUsage, eq, desc, count, and } from "@epicure/db";
import { getStorageUsedMb } from "@/lib/tiers";
import { Avatar, AvatarFallback, AvatarImage } from "@/components/ui/avatar";
import { Badge } from "@/components/ui/badge";
import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
import { Separator } from "@/components/ui/separator";
import { UserEditor } from "@/components/admin/user-editor";
import { ResetUsageButton } from "@/components/admin/reset-usage-button";
import Link from "next/link";
import { ArrowLeft } from "lucide-react";
import { requireFullAdminPage } from "@/lib/require-admin-page";

export const metadata: Metadata = {};

interface PageProps {
  params: Promise<{ id: string }>;
}

const ROLE_COLORS = {
  user: "secondary",
  moderator: "outline",
  admin: "destructive",
} as const;

const TIER_COLORS = {
  free: "secondary",
  pro: "default",
  family: "default",
} as const;

export default async function AdminUserDetailPage({ params }: PageProps) {
  await requireFullAdminPage();
  const { id } = await params;

  const [user] = await db.select().from(users).where(eq(users.id, id)).limit(1);
  if (!user) notFound();

  const currentMonth = new Date().toISOString().slice(0, 7);

  const [usage] = await db
    .select()
    .from(userUsage)
    .where(and(eq(userUsage.userId, id), eq(userUsage.month, currentMonth)))
    .limit(1);

  const [[recipeCountRow], storageUsedMb] = await Promise.all([
    db.select({ count: count() }).from(recipes).where(eq(recipes.authorId, id)),
    getStorageUsedMb(id),
  ]);

  const recentRecipes = await db
    .select({
      id: recipes.id,
      title: recipes.title,
      visibility: recipes.visibility,
      createdAt: recipes.createdAt,
    })
    .from(recipes)
    .where(eq(recipes.authorId, id))
    .orderBy(desc(recipes.createdAt))
    .limit(10);

  return (
    <div className="space-y-6">
      <div className="flex items-center gap-3">
        <Link
          href="/admin/users"
          className="flex items-center gap-1 text-sm text-muted-foreground hover:text-foreground"
        >
          <ArrowLeft className="h-4 w-4" />
          Back to Users
        </Link>
      </div>

      <div className="flex items-center gap-4">
        <Avatar className="h-16 w-16">
          <AvatarImage src={user.avatarUrl ?? ""} alt={user.name} />
          <AvatarFallback className="text-lg">
            {user.name.slice(0, 2).toUpperCase()}
          </AvatarFallback>
        </Avatar>
        <div>
          <h1 className="text-2xl font-bold tracking-tight">{user.name}</h1>
          <p className="text-muted-foreground">{user.email}</p>
          <p className="text-xs text-muted-foreground mt-1">
            Joined {user.createdAt.toLocaleDateString()}
          </p>
        </div>
        <div className="ml-auto flex gap-2">
          <Badge variant={ROLE_COLORS[user.role]}>{user.role}</Badge>
          <Badge variant={TIER_COLORS[user.tier]}>{user.tier}</Badge>
        </div>
      </div>

      <Separator />

      <div className="grid grid-cols-1 md:grid-cols-2 gap-6">
        <Card>
          <CardHeader>
            <CardTitle className="text-base">Edit Role &amp; Tier</CardTitle>
          </CardHeader>
          <CardContent>
            <UserEditor userId={user.id} currentRole={user.role} currentTier={user.tier} />
          </CardContent>
        </Card>

        <Card>
          <CardHeader>
            <CardTitle className="text-base">Usage &amp; Limits</CardTitle>
          </CardHeader>
          <CardContent className="space-y-3">
            <div className="flex justify-between text-sm">
              <span className="text-muted-foreground">AI Calls Used ({currentMonth})</span>
              <span className="font-medium">{usage?.aiCallsUsed ?? 0}</span>
            </div>
            <div className="flex justify-between text-sm">
              <span className="text-muted-foreground">Total Recipes</span>
              <span className="font-medium">{recipeCountRow?.count ?? 0}</span>
            </div>
            <div className="flex justify-between text-sm">
              <span className="text-muted-foreground">Storage Used</span>
              <span className="font-medium">{storageUsedMb} MB</span>
            </div>
            <div className="pt-2">
              <ResetUsageButton userId={user.id} />
            </div>
          </CardContent>
        </Card>
      </div>

      <div>
        <h2 className="text-lg font-semibold mb-3">Recent Recipes</h2>
        {recentRecipes.length === 0 ? (
          <p className="text-muted-foreground text-sm">No recipes yet.</p>
        ) : (
          <div className="rounded-md border">
            <table className="w-full text-sm">
              <thead className="border-b bg-muted/50">
                <tr>
                  <th className="px-4 py-3 text-left font-medium">Title</th>
                  <th className="px-4 py-3 text-left font-medium">Visibility</th>
                  <th className="px-4 py-3 text-left font-medium">Created</th>
                  <th className="px-4 py-3 text-left font-medium">Link</th>
                </tr>
              </thead>
              <tbody>
                {recentRecipes.map((recipe) => (
                  <tr key={recipe.id} className="border-b last:border-0 hover:bg-muted/30">
                    <td className="px-4 py-3 font-medium">{recipe.title}</td>
                    <td className="px-4 py-3">
                      <Badge variant="outline">{recipe.visibility}</Badge>
                    </td>
                    <td className="px-4 py-3 text-muted-foreground">
                      {recipe.createdAt.toLocaleDateString()}
                    </td>
                    <td className="px-4 py-3">
                      <Link
                        href={`/r/${recipe.id}`}
                        className="text-primary underline-offset-4 hover:underline text-xs"
                      >
                        View
                      </Link>
                    </td>
                  </tr>
                ))}
              </tbody>
            </table>
          </div>
        )}
      </div>
    </div>
  );
}