<?php

namespace App\Http\Controllers;

use App\Models\Consultant;
use App\Models\DataCentre;
use App\Models\ReportingCycle;
use App\Models\Submission;
use App\Models\SubmissionResult;
use Illuminate\Support\Facades\DB;

class DashboardController extends Controller
{
    public function index()
    {
        $user = auth()->user();

        if ($user->isPerunding()) {
            return $this->consultantDashboard();
        }

        return $this->jppDashboard();
    }

    protected function jppDashboard()
    {
        $activeCycle = ReportingCycle::aktif()->orderByDesc('renewal_year')->first();

        $totalDataCentres = DataCentre::aktif()->count();
        $activeConsultants = Consultant::aktif()->count();

        $submittedCount = 0;
        $notSubmittedCount = 0;
        $overdueCount = 0;
        $statusBreakdown = collect();

        if ($activeCycle) {
            $expected = DataCentre::aktif()->whereNotNull('current_consultant_id')->count();
            $submittedCount = Submission::where('reporting_cycle_id', $activeCycle->id)
                ->where('status', '!=', 'draf')->count();
            $notSubmittedCount = max(0, $expected - $submittedCount);

            $statusBreakdown = Submission::where('reporting_cycle_id', $activeCycle->id)
                ->select('status', DB::raw('count(*) as jumlah'))
                ->groupBy('status')->pluck('jumlah', 'status');

            if ($activeCycle->isOverdue()) {
                $overdueCount = $notSubmittedCount;
            }
        }

        // Jumlah karbon A,B,C,D,E mengikut tahun pelaporan
        $carbonByYear = SubmissionResult::query()
            ->join('submissions', 'submissions.id', '=', 'submission_results.submission_id')
            ->join('reporting_cycles', 'reporting_cycles.id', '=', 'submissions.reporting_cycle_id')
            ->whereNull('submissions.deleted_at')
            ->select(
                'reporting_cycles.reporting_year',
                'submission_results.result_token',
                DB::raw('SUM(submission_results.value) as jumlah')
            )
            ->groupBy('reporting_cycles.reporting_year', 'submission_results.result_token')
            ->get()
            ->groupBy('reporting_year');

        // Pusat data tertinggi mengikut anggaran karbon (token A)
        $topDataCentres = SubmissionResult::query()
            ->where('submission_results.result_token', 'A')
            ->join('submissions', 'submissions.id', '=', 'submission_results.submission_id')
            ->join('data_centres', 'data_centres.id', '=', 'submissions.data_centre_id')
            ->whereNull('submissions.deleted_at')
            ->select('data_centres.nama_pusat_data', DB::raw('SUM(submission_results.value) as jumlah'))
            ->groupBy('data_centres.nama_pusat_data')
            ->orderByDesc('jumlah')
            ->limit(10)
            ->get();

        return view('dashboard.jpp', compact(
            'activeCycle', 'totalDataCentres', 'activeConsultants',
            'submittedCount', 'notSubmittedCount', 'overdueCount',
            'statusBreakdown', 'carbonByYear', 'topDataCentres'
        ));
    }

    protected function consultantDashboard()
    {
        $consultant = auth()->user()->consultant;

        $dataCentres = collect();
        $submissions = collect();
        $pendingCount = 0;
        $correctionCount = 0;
        $activeCycle = ReportingCycle::aktif()->orderByDesc('renewal_year')->first();

        if ($consultant) {
            $dataCentres = DataCentre::where('current_consultant_id', $consultant->id)->get();

            $submissions = Submission::where('consultant_id', $consultant->id)
                ->with(['dataCentre', 'reportingCycle'])
                ->latest()->get();

            $correctionCount = $submissions->where('status', 'pembetulan_perunding')->count();

            if ($activeCycle) {
                $submittedDcIds = Submission::where('consultant_id', $consultant->id)
                    ->where('reporting_cycle_id', $activeCycle->id)
                    ->where('status', '!=', 'draf')
                    ->pluck('data_centre_id');
                $pendingCount = $dataCentres->whereNotIn('id', $submittedDcIds)->count();
            }
        }

        return view('dashboard.consultant', compact(
            'consultant', 'dataCentres', 'submissions',
            'pendingCount', 'correctionCount', 'activeCycle'
        ));
    }
}