<?php

namespace App\Http\Controllers\Web;

use App\Http\Controllers\Controller;
use App\Models\Department;
use App\Models\User;
use App\Services\DateRangeService;
use App\Services\Reports\Contracts\ReportDefinition;
use App\Services\Reports\Export\ReportExcelExport;
use App\Services\Reports\Export\ReportPdfExport;
use App\Services\Reports\ReportRegistry;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;
use Inertia\Inertia;
use Maatwebsite\Excel\Facades\Excel;

class ReportsController extends Controller
{
    public function __construct(
        protected ReportRegistry $reportRegistry,
        protected DateRangeService $dateRangeService,
    ) {}

    public function index(Request $request)
    {
        $user = Auth::user();
        $available = $this->reportRegistry->availableFor($user);

        abort_if(empty($available), 403);

        $department = $this->resolveDepartment($request, $user);
        $dateRange = $this->dateRangeService->getDateRangeFromRequest($request, $user);

        // Без явного типа в запросе показываем только список отчётов — без предпросмотра.
        $type = $request->query('type');
        $definition = $type ? $this->reportRegistry->find($type, $user) : null;
        $payload = $definition?->build($department, $dateRange);

        return Inertia::render('Reports/Index', [
            'reportTypes' => array_map(fn (ReportDefinition $d) => [
                'code' => $d->code(),
                'label' => $d->label(),
                'audience' => $this->audienceLabel($d->requiredPermissions()),
            ], $available),
            'departments' => collect($user->availableDepartments())->map(fn (Department $d) => [
                'id' => $d->department_id,
                'name' => $d->name_full ?? $d->name_short,
            ])->values()->all(),
            'selectedType' => $definition?->code(),
            'selectedDepartmentId' => $department->department_id,
            'isHeadOrAdmin' => $user->isSeniorStaff(),
            'date' => [
                $dateRange->start()->getTimestampMs(),
                $dateRange->end()->getTimestampMs(),
            ],
            'payload' => $payload ? [
                'title' => $payload->title,
                'meta' => $payload->meta,
                'sections' => array_map(fn ($section) => [
                    'title' => $section->title,
                    'columns' => $section->columns,
                    'rows' => $section->rows,
                ], $payload->sections),
            ] : null,
        ]);
    }

    public function exportExcel(Request $request)
    {
        [$definition, $department, $dateRange] = $this->resolveExportContext($request);

        $payload = $definition->build($department, $dateRange);

        return Excel::download(new ReportExcelExport($payload), $this->fileName($definition, 'xlsx'));
    }

    public function exportPdf(Request $request)
    {
        [$definition, $department, $dateRange] = $this->resolveExportContext($request);

        $payload = $definition->build($department, $dateRange);

        return ReportPdfExport::render($payload)->download($this->fileName($definition, 'pdf'));
    }

    /**
     * @return array{0: ReportDefinition, 1: Department, 2: \App\Services\DateRange}
     */
    private function resolveExportContext(Request $request): array
    {
        $user = Auth::user();
        $type = $request->query('type');
        $definition = $type ? $this->reportRegistry->find($type, $user) : null;

        abort_if($definition === null, 403);

        $department = $this->resolveDepartment($request, $user);
        $dateRange = $this->dateRangeService->getDateRangeFromRequest($request, $user);

        return [$definition, $department, $dateRange];
    }

    private function resolveDepartment(Request $request, User $user): Department
    {
        $departmentId = $request->query('departmentId');
        $available = collect($user->availableDepartments());

        if ($departmentId && $available->contains(fn (Department $d) => (int) $d->department_id === (int) $departmentId)) {
            return $available->first(fn (Department $d) => (int) $d->department_id === (int) $departmentId);
        }

        return $user->department ?? $available->first();
    }

    /**
     * @param  array<int,string>  $permissions
     */
    private function audienceLabel(array $permissions): string
    {
        if (empty($permissions)) {
            return 'Доступен всем';
        }

        $labels = [
            'report.view' => 'Дежурный врач',
            'nurse.report.view' => 'Старшая медсестра',
        ];

        return implode(' · ', array_map(fn ($p) => $labels[$p] ?? $p, $permissions));
    }

    private function fileName(ReportDefinition $definition, string $extension): string
    {
        $slug = str_replace([' ', ':', '/', '\\'], '_', $definition->label());

        return sprintf('%s_%s.%s', $slug, now('Asia/Yakutsk')->format('Ymd_His'), $extension);
    }
}