<?php

namespace App\Http\Controllers;

use App\Models\Person;
use App\Models\Migration;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
use Carbon\Carbon;

class DashboardController extends Controller
{
    public function getStats()
    {
        // Total migrants count
        $totalMigrants = Person::count();
        
        // New migrants in the current month
        $currentMonthStart = Carbon::now()->startOfMonth();
        $newThisMonth = Person::where('created_at', '>=', $currentMonthStart)->count();
        
        // Recent additions (last 30 days)
        $thirtyDaysAgo = Carbon::now()->subDays(30);
        $recentAdditions = Person::where('created_at', '>=', $thirtyDaysAgo)->count();
        
        // Pending reviews - example: people with missing information
        $pendingReviews = Person::whereNull('date_of_birth')
                              ->orWhereNull('place_of_birth')
                              ->orWhereNull('occupation')
                              ->count();
        
        // Incomplete records - persons missing multiple key fields
        $incompleteRecords = Person::where(function($query) {
            $query->whereNull('date_of_birth')
                  ->orWhereNull('place_of_birth');
        })
        ->where(function($query) {
            $query->whereNull('occupation')
                  ->orWhereNull('reference')
                  ->orWhereNull('id_card_no');
        })
        ->count();
        
        // Find peak migration period (by year)
        $peakMigrationYear = Migration::select(DB::raw('YEAR(date_of_arrival_nt) as year'), DB::raw('COUNT(*) as count'))
            ->whereNotNull('date_of_arrival_nt')
            ->groupBy(DB::raw('YEAR(date_of_arrival_nt)'))
            ->orderBy('count', 'desc')
            ->first();
            
        // Find most common place of birth
        $mostCommonOrigin = Person::select('place_of_birth', DB::raw('COUNT(*) as count'))
            ->whereNotNull('place_of_birth')
            ->where('place_of_birth', '!=', '')
            ->groupBy('place_of_birth')
            ->orderBy('count', 'desc')
            ->first();
        
        return response()->json([
            'success' => true,
            'data' => [
                'total_migrants' => $totalMigrants,
                'new_this_month' => $newThisMonth,
                'recent_additions' => $recentAdditions,
                'pending_reviews' => $pendingReviews,
                'incomplete_records' => $incompleteRecords,
                'peak_migration_year' => $peakMigrationYear ? [
                    'year' => $peakMigrationYear->year,
                    'count' => $peakMigrationYear->count
                ] : null,
                'most_common_origin' => $mostCommonOrigin ? [
                    'place' => $mostCommonOrigin->place_of_birth,
                    'count' => $mostCommonOrigin->count
                ] : null
            ]
        ]);
    }
}