<?php

namespace App\Http\Controllers\Admin;

use App\Http\Controllers\Controller;
use App\Models\CuSelection;
use App\Models\CuSubmission;
use App\Models\KategoriCu;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;

class CuSelectionController extends Controller
{
    public function index()
    {
        $selections = CuSelection::select([
                'peserta_id',
                DB::raw('SUM(skor_cu) AS total_skor_cu'),
                DB::raw('ROUND(SUM(skor_cu)/10,4) AS avg_skor_cu'),
                DB::raw("(SELECT cs2.status_lolos
                          FROM cu_selection cs2
                          WHERE cs2.peserta_id = cu_selection.peserta_id
                            AND cs2.selection_round = 1
                          ORDER BY cs2.selected_at DESC
                          LIMIT 1) AS status_lolos"),
                DB::raw("(SELECT cs3.selected_at
                          FROM cu_selection cs3
                          WHERE cs3.peserta_id = cu_selection.peserta_id
                            AND cs3.selection_round = 1
                          ORDER BY cs3.selected_at DESC
                          LIMIT 1) AS selected_at"),
            ])
            ->where('selection_round', 1)
            ->groupBy('peserta_id')
            ->with('peserta.user')
            ->orderByDesc('avg_skor_cu')
            ->get();

        return view('admin.selection', compact('selections'));
    }

    public function showDetail($pesertaId)
    {
        // Ambil semua CU yang sudah approved dan eager load kategori + bidang-nya
        $submissions = CuSubmission::with(['kategori', 'kategori.bidang'])
            ->where('peserta_id', $pesertaId)
            ->where('status', CuSubmission::STATUS_APPROVED)
            ->get();

        // Group per bidang & pilih top-4 per bidang
        $byBidang = $submissions->groupBy(fn($item) => $item->kategori->bidang_id);
        $pool = collect();
        foreach ($byBidang as $group) {
            $pool = $pool->merge($group->sortByDesc('skor')->take(4));
        }

        // Top-10 overall
        $finalSelectedCUs = $pool->sortByDesc('skor')->take(10)->values();

        // Hitung total skor dan maksimal per hitungan SAW
        $totalSkorCU = $finalSelectedCUs->sum('skor');
        $maxPerBidang = KategoriCu::groupBy('bidang_id')
            ->select('bidang_id', DB::raw('MAX(skor) AS max_skor'))
            ->pluck('max_skor', 'bidang_id');

        $maxSkorCU = $byBidang->reduce(function ($carry, $group) use ($maxPerBidang) {
            $bidangId = $group->first()->kategori->bidang_id;
            $count    = min(4, $group->count());
            return $carry + ($maxPerBidang[$bidangId] ?? 0) * $count;
        }, 0);

        $norm = $maxSkorCU > 0 ? round($totalSkorCU / $maxSkorCU, 4) : 0;

        if (request()->ajax()) {
            // Partial di folder admin/partials/selection_detail.blade.php
            return view('admin.layouts.partials.selection_detail', compact(
                'finalSelectedCUs', 'totalSkorCU', 'maxSkorCU', 'norm'
            ));
        }

        return redirect()->route('admin.cu_selection.index');
    }

    public function updateStatus(Request $request, $pesertaId)
    {
        $request->validate([ 'status_lolos' => 'required|in:lolos,gagal' ]);

        CuSelection::where('peserta_id', $pesertaId)
            ->where('selection_round', 1)
            ->update([
                'status_lolos' => $request->status_lolos,
                'selected_at'  => now(),
            ]);

        return back()->with('success', 'Status peserta berhasil diperbarui.');
    }
}