export const dynamic = 'force-dynamic';
import { createClient } from '@/lib/supabase/server';
import { redirect } from 'next/navigation';
import { checkIsAdmin, getGlobalApiStats } from '@/services/track-api-usage';
import { BarChart3, TrendingUp, Users, Calendar, AlertCircle } from 'lucide-react';
import Link from 'next/link';

export default async function AdminPage() {
    const supabase = await createClient();
    const { data: { user } } = await supabase.auth.getUser();

    console.log('[Admin Page] User:', user?.id, user?.email);

    if (!user) {
        console.log('[Admin Page] No user found, redirecting to home');
        redirect('/');
    }

    const isAdmin = await checkIsAdmin(user.id);
    console.log('[Admin Page] Is admin check result:', isAdmin);

    if (!isAdmin) {
        console.log('[Admin Page] User is not admin, redirecting to home');
        redirect('/');
    }

    console.log('[Admin Page] Access granted, loading dashboard');

    // Fetch global API stats
    const stats = await getGlobalApiStats();

    // Fetch recent API usage without join to avoid relationship errors
    console.log('[Admin Page] Fetching recent API usage...');
    const { data: recentUsageRaw, error: recentError } = await supabase
        .from('api_usage')
        .select('*')
        .order('created_at', { ascending: false })
        .limit(50);

    console.log('[Admin Page] Recent usage raw - count:', recentUsageRaw?.length, 'error:', recentError);

    // Get unique user IDs from recent usage
    const recentUserIds = Array.from(new Set(recentUsageRaw?.map(u => u.user_id) || []));

    // Fetch profiles for these users
    const { data: recentProfiles } = recentUserIds.length > 0
        ? await supabase.from('profiles').select('id, username').in('id', recentUserIds)
        : { data: [] };

    // Combine usage with profiles
    const recentUsage = recentUsageRaw?.map(usage => ({
        ...usage,
        profiles: recentProfiles?.find(p => p.id === usage.user_id) || { username: 'Unknown' }
    })) || [];

    // Fetch per-user statistics
    const { data: userStatsRaw } = await supabase
        .from('api_usage')
        .select('user_id, api_type');

    // Group by user
    const userStatsMap = new Map<string, { googleSearch: number; geminiAi: number; total: number }>();
    userStatsRaw?.forEach(item => {
        const current = userStatsMap.get(item.user_id) || { googleSearch: 0, geminiAi: 0, total: 0 };
        if (item.api_type === 'google_search') current.googleSearch++;
        if (item.api_type === 'gemini_ai') current.geminiAi++;
        current.total++;
        userStatsMap.set(item.user_id, current);
    });

    // Get user details for top users
    const topUserIds = Array.from(userStatsMap.entries())
        .sort((a, b) => b[1].total - a[1].total)
        .slice(0, 10)
        .map(([userId]) => userId);

    const { data: topUsers } = topUserIds.length > 0
        ? await supabase.from('profiles').select('id, username').in('id', topUserIds)
        : { data: [] };

    const topUsersWithStats = topUsers?.map(user => ({
        ...user,
        stats: userStatsMap.get(user.id)!
    })) || [];

    return (
        <main className="min-h-screen bg-zinc-50 dark:bg-black p-4 md:p-12">
            <div className="max-w-7xl mx-auto space-y-8">
                {/* Header */}
                <div className="flex items-center justify-between">
                    <div>
                        <h1 className="text-3xl font-black text-zinc-900 dark:text-white tracking-tight">Admin Dashboard</h1>
                        <p className="text-zinc-500 mt-1">API Usage Monitoring & Statistics</p>
                    </div>
                    <div className="flex gap-3">
                        <Link
                            href="/admin/ocr-logs"
                            className="px-4 py-2 bg-cyan-600 hover:bg-cyan-700 text-white rounded-xl font-bold transition-colors"
                        >
                            OCR Logs
                        </Link>
                        <Link
                            href="/admin/plans"
                            className="px-4 py-2 bg-purple-600 hover:bg-purple-700 text-white rounded-xl font-bold transition-colors"
                        >
                            Manage Plans
                        </Link>
                        <Link
                            href="/admin/tags"
                            className="px-4 py-2 bg-pink-600 hover:bg-pink-700 text-white rounded-xl font-bold transition-colors"
                        >
                            Manage Tags
                        </Link>
                        <Link
                            href="/admin/users"
                            className="px-4 py-2 bg-amber-600 hover:bg-amber-700 text-white rounded-xl font-bold transition-colors"
                        >
                            Manage Users
                        </Link>
                        <Link
                            href="/admin/banners"
                            className="px-4 py-2 bg-cyan-600 hover:bg-cyan-700 text-white rounded-xl font-bold transition-colors"
                        >
                            Manage Banners
                        </Link>
                        <Link
                            href="/admin/bottles"
                            className="px-4 py-2 bg-orange-600 hover:bg-orange-700 text-white rounded-xl font-bold transition-colors"
                        >
                            All Bottles
                        </Link>
                        <Link
                            href="/admin/splits"
                            className="px-4 py-2 bg-purple-600 hover:bg-purple-700 text-white rounded-xl font-bold transition-colors"
                        >
                            All Splits
                        </Link>
                        <Link
                            href="/admin/tastings"
                            className="px-4 py-2 bg-pink-600 hover:bg-pink-700 text-white rounded-xl font-bold transition-colors"
                        >
                            All Tastings
                        </Link>
                        <Link
                            href="/"
                            className="px-4 py-2 bg-zinc-900 dark:bg-zinc-100 text-white dark:text-zinc-900 rounded-xl font-bold hover:bg-zinc-800 transition-colors"
                        >
                            Back to App
                        </Link>
                    </div>
                </div>

                {/* Global Stats Cards */}
                <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-4 gap-6">
                    <div className="bg-white dark:bg-zinc-900 rounded-2xl p-6 border border-zinc-200 dark:border-zinc-800 shadow-sm">
                        <div className="flex items-center gap-3 mb-2">
                            <div className="p-2 bg-blue-100 dark:bg-blue-900/30 rounded-lg">
                                <BarChart3 size={20} className="text-blue-600 dark:text-blue-400" />
                            </div>
                            <span className="text-xs font-black uppercase text-zinc-400">Total Calls</span>
                        </div>
                        <div className="text-3xl font-black text-zinc-900 dark:text-white">{stats?.totalCalls || 0}</div>
                        <div className="text-xs text-zinc-500 mt-1">All time</div>
                    </div>

                    <div className="bg-white dark:bg-zinc-900 rounded-2xl p-6 border border-zinc-200 dark:border-zinc-800 shadow-sm">
                        <div className="flex items-center gap-3 mb-2">
                            <div className="p-2 bg-green-100 dark:bg-green-900/30 rounded-lg">
                                <Calendar size={20} className="text-green-600 dark:text-green-400" />
                            </div>
                            <span className="text-xs font-black uppercase text-zinc-400">Today</span>
                        </div>
                        <div className="text-3xl font-black text-zinc-900 dark:text-white">{stats?.todayCalls || 0}</div>
                        <div className="text-xs text-zinc-500 mt-1">
                            {stats?.todayCalls && stats.todayCalls >= 80 ? (
                                <span className="text-red-500 font-bold flex items-center gap-1">
                                    <AlertCircle size={12} /> Limit reached
                                </span>
                            ) : (
                                `${80 - (stats?.todayCalls || 0)} remaining`
                            )}
                        </div>
                    </div>

                    <div className="bg-white dark:bg-zinc-900 rounded-2xl p-6 border border-zinc-200 dark:border-zinc-800 shadow-sm">
                        <div className="flex items-center gap-3 mb-2">
                            <div className="p-2 bg-amber-100 dark:bg-amber-900/30 rounded-lg">
                                <TrendingUp size={20} className="text-amber-600 dark:text-amber-400" />
                            </div>
                            <span className="text-xs font-black uppercase text-zinc-400">Google Search</span>
                        </div>
                        <div className="text-3xl font-black text-zinc-900 dark:text-white">{stats?.googleSearchCalls || 0}</div>
                        <div className="text-xs text-zinc-500 mt-1">Whiskybase searches</div>
                    </div>

                    <div className="bg-white dark:bg-zinc-900 rounded-2xl p-6 border border-zinc-200 dark:border-zinc-800 shadow-sm">
                        <div className="flex items-center gap-3 mb-2">
                            <div className="p-2 bg-purple-100 dark:bg-purple-900/30 rounded-lg">
                                <Users size={20} className="text-purple-600 dark:text-purple-400" />
                            </div>
                            <span className="text-xs font-black uppercase text-zinc-400">Gemini AI</span>
                        </div>
                        <div className="text-3xl font-black text-zinc-900 dark:text-white">{stats?.geminiAiCalls || 0}</div>
                        <div className="text-xs text-zinc-500 mt-1">Bottle analyses</div>
                    </div>
                </div>

                {/* Top Users */}
                <div className="bg-white dark:bg-zinc-900 rounded-2xl p-6 border border-zinc-200 dark:border-zinc-800 shadow-sm">
                    <h2 className="text-xl font-black text-zinc-900 dark:text-white mb-4">Top Users by API Usage</h2>
                    <div className="space-y-3">
                        {topUsersWithStats.map((user, index) => (
                            <div key={user.id} className="flex items-center justify-between p-3 bg-zinc-50 dark:bg-zinc-800/50 rounded-xl">
                                <div className="flex items-center gap-3">
                                    <div className="w-8 h-8 rounded-full bg-amber-100 dark:bg-amber-900/30 flex items-center justify-center text-amber-700 dark:text-amber-500 font-black text-sm">
                                        {index + 1}
                                    </div>
                                    <div>
                                        <div className="font-bold text-zinc-900 dark:text-white">{user.username}</div>
                                        <div className="text-xs text-zinc-500">
                                            {user.stats.googleSearch} searches · {user.stats.geminiAi} analyses
                                        </div>
                                    </div>
                                </div>
                                <div className="text-2xl font-black text-zinc-900 dark:text-white">{user.stats.total}</div>
                            </div>
                        ))}
                    </div>
                </div>

                {/* Recent API Calls */}
                <div className="bg-white dark:bg-zinc-900 rounded-2xl p-6 border border-zinc-200 dark:border-zinc-800 shadow-sm">
                    <h2 className="text-xl font-black text-zinc-900 dark:text-white mb-4">Recent API Calls</h2>
                    <div className="text-sm text-zinc-500 mb-4">
                        Total calls logged: {recentUsage?.length || 0}
                    </div>
                    {!recentUsage || recentUsage.length === 0 ? (
                        <div className="text-center py-8 text-zinc-500">
                            <AlertCircle className="mx-auto mb-2" size={32} />
                            <p>No API calls recorded yet</p>
                            {recentError && (
                                <p className="text-red-500 text-xs mt-2">Error: {recentError.message}</p>
                            )}
                        </div>
                    ) : (
                        <div className="overflow-x-auto">
                            <table className="w-full">
                                <thead>
                                    <tr className="border-b border-zinc-200 dark:border-zinc-800">
                                        <th className="text-left py-3 px-4 text-xs font-black uppercase text-zinc-400">Time</th>
                                        <th className="text-left py-3 px-4 text-xs font-black uppercase text-zinc-400">User</th>
                                        <th className="text-left py-3 px-4 text-xs font-black uppercase text-zinc-400">API/Provider</th>
                                        <th className="text-left py-3 px-4 text-xs font-black uppercase text-zinc-400">Model</th>
                                        <th className="text-left py-3 px-4 text-xs font-black uppercase text-zinc-400">Endpoint</th>
                                        <th className="text-left py-3 px-4 text-xs font-black uppercase text-zinc-400">Status</th>
                                    </tr>
                                </thead>
                                <tbody>
                                    {recentUsage.map((call: any) => (
                                        <tr key={call.id} className="border-b border-zinc-100 dark:border-zinc-800/50 hover:bg-zinc-50 dark:hover:bg-zinc-900/50 transition-colors">
                                            <td className="py-3 px-4 text-[10px] text-zinc-500 font-mono">
                                                {new Date(call.created_at).toLocaleString('de-DE', { hour: '2-digit', minute: '2-digit', second: '2-digit', day: '2-digit', month: '2-digit' })}
                                            </td>
                                            <td className="py-3 px-4 text-sm font-bold text-zinc-900 dark:text-white">
                                                {call.profiles?.username || 'Unknown'}
                                            </td>
                                            <td className="py-3 px-4">
                                                <div className="flex flex-col gap-1">
                                                    <span className={`px-2 py-0.5 rounded-full text-[10px] font-black uppercase w-fit ${call.api_type === 'google_search'
                                                        ? 'bg-blue-100 dark:bg-blue-900/30 text-blue-700 dark:text-blue-400'
                                                        : 'bg-purple-100 dark:bg-purple-900/30 text-purple-700 dark:text-purple-400'
                                                        }`}>
                                                        {call.api_type === 'google_search' ? 'Google' : 'AI'}
                                                    </span>
                                                    {call.provider && (
                                                        <span className="text-[10px] font-bold text-zinc-500 uppercase tracking-tighter">
                                                            via {call.provider}
                                                        </span>
                                                    )}
                                                </div>
                                            </td>
                                            <td className="py-3 px-4">
                                                <span className="text-[10px] font-mono text-zinc-600 dark:text-zinc-400 block max-w-[120px] truncate" title={call.model}>
                                                    {call.model || '-'}
                                                </span>
                                            </td>
                                            <td className="py-3 px-4">
                                                <div className="space-y-1">
                                                    <div className="text-[10px] font-bold text-zinc-500 uppercase">{call.endpoint}</div>
                                                    {call.response_text && (
                                                        <details className="text-[10px]">
                                                            <summary className="cursor-pointer text-orange-600 hover:text-orange-700 font-bold uppercase transition-colors">Response</summary>
                                                            <pre className="mt-2 p-2 bg-zinc-100 dark:bg-zinc-950 rounded border border-zinc-200 dark:border-zinc-800 overflow-x-auto max-w-sm whitespace-pre-wrap font-mono text-[9px] text-zinc-400">
                                                                {call.response_text}
                                                            </pre>
                                                        </details>
                                                    )}
                                                </div>
                                            </td>
                                            <td className="py-3 px-4">
                                                {call.success ? (
                                                    <span className="text-green-600 dark:text-green-400 font-black text-xs">OK</span>
                                                ) : (
                                                    <div className="group relative">
                                                        <span className="text-red-600 dark:text-red-400 font-black text-xs cursor-help">ERR</span>
                                                        {call.error_message && (
                                                            <div className="absolute bottom-full left-1/2 -translate-x-1/2 mb-2 w-48 p-2 bg-red-600 text-white text-[9px] rounded shadow-xl opacity-0 group-hover:opacity-100 transition-opacity pointer-events-none z-50">
                                                                {call.error_message}
                                                            </div>
                                                        )}
                                                    </div>
                                                )}
                                            </td>
                                        </tr>
                                    ))}
                                </tbody>
                            </table>
                        </div>
                    )}
                </div>
            </div>
        </main>
    );
}