<?php

namespace App\Http\Controllers\Admin;

use App\Http\Controllers\Controller;
use Illuminate\Http\Request;
use Inertia\Inertia;

class DashboardController extends Controller
{
    /**
     * Display the admin dashboard overview.
     */
    public function index()
    {
        // Dynamic Database Queries
        $totalWorkers = \App\Models\Worker::count();
        $activeWorkers = \App\Models\Worker::where('status', 'active')->count();
        $inactiveWorkers = $totalWorkers - $activeWorkers;
        
        $totalEmployers = \App\Models\User::where('role', 'employer')->count();
        $activeEmployers = \App\Models\User::where('role', 'employer')
            ->where(function($query) {
                $query->whereHas('sponsor', function($q) {
                    $q->where('status', 'active');
                })->orWhereDoesntHave('sponsor');
            })->count();
        $inactiveEmployers = $totalEmployers - $activeEmployers;
        
        $activeSubs = \Illuminate\Support\Facades\DB::table('subscriptions')->where('status', 'active')->count();
        $expiredSubs = \Illuminate\Support\Facades\DB::table('subscriptions')->where('status', 'expired')->count();
        $newEmployers = \App\Models\User::where('role', 'employer')->where('created_at', '>=', now()->subDays(7))->count();
        $revenueSum = \Illuminate\Support\Facades\DB::table('subscriptions')->where('status', 'active')->sum('amount_aed');

        // Dynamic conversion rates
        $verifiedCount = \App\Models\Worker::where('verified', true)->count();
        $verificationRate = $totalWorkers > 0 ? round(($verifiedCount / $totalWorkers) * 100, 1) : 0.0;

        $hiredCount = \App\Models\Worker::where('status', 'hired')->count();
        $hiringConversionRate = $totalWorkers > 0 ? round(($hiredCount / $totalWorkers) * 100, 1) : 0.0;

        $chatsCount = \Illuminate\Support\Facades\DB::table('conversations')->count();
        $chatToHireRate = $chatsCount > 0 ? round(($hiredCount / $chatsCount) * 100, 1) : 0.0;

        $activeRatio = $totalWorkers > 0 ? round(($activeWorkers / $totalWorkers) * 100) : 0;
        $activeUsersRatio = $activeRatio . '% Active';

        // Custom subscription trends
        $months = [];
        for ($i = 5; $i >= 0; $i--) {
            $months[] = now()->subMonths($i);
        }

        $trendData = [];
        foreach ($months as $date) {
            $monthStart = $date->copy()->startOfMonth();
            $monthEnd = $date->copy()->endOfMonth();
            
            $basic = \Illuminate\Support\Facades\DB::table('subscriptions')
                ->where('plan_id', 'basic')
                ->whereBetween('created_at', [$monthStart, $monthEnd])
                ->count();
                
            $premium = \Illuminate\Support\Facades\DB::table('subscriptions')
                ->where('plan_id', 'premium')
                ->whereBetween('created_at', [$monthStart, $monthEnd])
                ->count();
                
            $vip = \Illuminate\Support\Facades\DB::table('subscriptions')
                ->whereIn('plan_id', ['vip', 'enterprise'])
                ->whereBetween('created_at', [$monthStart, $monthEnd])
                ->count();

            $trendData[] = [
                'month' => $date->format('M'),
                'basic' => $basic,
                'premium' => $premium,
                'vip' => $vip,
            ];
        }

        // Funnel
        $profilesBrowsed = \Illuminate\Support\Facades\DB::table('profile_views')->count();
        $chatsInitiated = \Illuminate\Support\Facades\DB::table('conversations')->count();
        $candidatesShortlisted = \Illuminate\Support\Facades\DB::table('shortlists')->count();
        $workersHired = $hiredCount;

        $verificationsToday = \App\Models\Worker::where('verified', true)
            ->where('updated_at', '>=', now()->startOfDay())
            ->count();

        $stats = [
            'total_workers' => $totalWorkers,
            'active_workers' => $activeWorkers,
            'inactive_workers' => $inactiveWorkers,
            'total_employers' => $totalEmployers,
            'active_employers' => $activeEmployers,
            'inactive_employers' => $inactiveEmployers,
            'active_subscriptions' => $activeSubs,
            'revenue_this_month_aed' => $revenueSum,
            'new_employers_this_week' => $newEmployers,
            'expired_subscriptions' => $expiredSubs,
            'hiring_conversion_rate' => $hiringConversionRate, 
            'chat_to_hire_rate' => $chatToHireRate, 
            'verification_rate' => $verificationRate,
            'active_users_ratio' => $activeUsersRatio,
            'trend_data' => $trendData,
            'verifications_today' => $verificationsToday,
            'verified_workers_count' => $verifiedCount,
            'funnel' => [
                'profiles_browsed' => $profilesBrowsed,
                'chats_initiated' => $chatsInitiated,
                'candidates_shortlisted' => $candidatesShortlisted,
                'workers_hired' => $workersHired,
            ],
            'worker_availability' => [
                'Active' => \App\Models\Worker::where('status', 'active')->count(),
                'Hidden' => \App\Models\Worker::where('status', 'hidden')->count(),
                'Hired' => \App\Models\Worker::where('status', 'hired')->count()
            ],
        ];

        // Process verifications automatically or fetched dynamically
        $recentVerifications = \App\Models\Worker::where('verified', true)
            ->with(['documents' => function($q) {
                $q->orderBy('created_at', 'desc');
            }])
            ->latest('updated_at')
            ->take(5)
            ->get()
            ->map(function ($worker) {
                $doc = $worker->documents->first();
                return [
                    'id' => $worker->id,
                    'name' => $worker->name,
                    'type' => 'Worker',
                    'processed_at' => $worker->updated_at ? $worker->updated_at->diffForHumans() : 'Recently',
                    'document_type' => $doc ? ucfirst($doc->type) : 'Passport & Visa',
                    'status' => 'Auto-Approved',
                ];
            })->toArray();

        // Fetch recent subscriptions from subscriptions table
        $recentSubs = \Illuminate\Support\Facades\DB::table('subscriptions')
            ->leftJoin('users', 'subscriptions.user_id', '=', 'users.id')
            ->select('subscriptions.*', 'users.name as employer_name')
            ->latest('subscriptions.created_at')
            ->take(5)
            ->get();

        $recentSubscriptions = [];
        foreach ($recentSubs as $sub) {
            $planName = ucfirst($sub->plan_id) . ' Pass';
            $recentSubscriptions[] = [
                'id' => $sub->id,
                'employer_name' => $sub->employer_name ?: 'System Guest / Sponsor',
                'plan_name' => $planName,
                'amount_aed' => (float)$sub->amount_aed,
                'subscribed_at' => \Carbon\Carbon::parse($sub->created_at)->diffForHumans(),
            ];
        }

        return Inertia::render('Admin/Dashboard', [
            'stats' => $stats,
            'recent_verifications' => $recentVerifications,
            'recent_subscriptions' => $recentSubscriptions,
        ]);
    }

    /**
     * Approve a pending verification (Legacy/Manual Override).
     */
    public function approveVerification(Request $request)
    {
        $validated = $request->validate([
            'id' => 'required|integer',
        ]);

        return back()->with('success', 'Verification document #' . $validated['id'] . ' has been approved manually.');
    }

    /**
     * Reject a pending verification (Legacy/Manual Override).
     */
    public function rejectVerification(Request $request)
    {
        $validated = $request->validate([
            'id' => 'required|integer',
        ]);

        return back()->with('success', 'Verification document #' . $validated['id'] . ' has been rejected.');
    }
}