<?php

namespace App\Http\Controllers\Web\Admin;

use App\Http\Controllers\Controller;
use App\Models\ReportTemplate;
use App\Services\Reports\ReportSourceRegistry;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;
use Inertia\Inertia;

class ReportTemplateController extends Controller
{
    private const PERMISSION_OPTIONS = ['report.view', 'nurse.report.view'];

    public function __construct(protected ReportSourceRegistry $sources) {}

    public function index()
    {
        $this->authorizeAccess();

        $templates = ReportTemplate::with('creator')->latest()->get()->map(fn (ReportTemplate $t) => [
            'id' => $t->id,
            'name' => $t->name,
            'sourceLabels' => collect($t->sections ?? [])
                ->map(fn (array $s) => $this->sources->all()[$s['source']]?->label ?? $s['source'])
                ->unique()
                ->values()
                ->all(),
            'sectionsCount' => count($t->sections ?? []),
            'requiredPermissions' => $t->required_permissions ?? [],
            'creator' => $t->creator?->name,
        ]);

        return Inertia::render('Admin/ReportTemplates/Index', ['templates' => $templates]);
    }

    public function create()
    {
        $this->authorizeAccess();

        return Inertia::render('Admin/ReportTemplates/Form', [
            'template' => null,
            'sources' => $this->sourcesPayload(),
        ]);
    }

    public function store(Request $request)
    {
        $this->authorizeAccess();

        ReportTemplate::create([
            ...$this->validateTemplate($request),
            'created_by' => Auth::id(),
        ]);

        return redirect('/admin/report-templates')->with('success', 'Шаблон создан');
    }

    public function edit(ReportTemplate $template)
    {
        $this->authorizeAccess();

        return Inertia::render('Admin/ReportTemplates/Form', [
            'template' => [
                'id' => $template->id,
                'name' => $template->name,
                'sections' => $template->sections,
                'requiredPermissions' => $template->required_permissions ?? [],
            ],
            'sources' => $this->sourcesPayload(),
        ]);
    }

    public function update(ReportTemplate $template, Request $request)
    {
        $this->authorizeAccess();

        $template->update($this->validateTemplate($request));

        return redirect('/admin/report-templates')->with('success', 'Шаблон сохранён');
    }

    public function destroy(ReportTemplate $template)
    {
        $this->authorizeAccess();

        $template->delete();

        return redirect('/admin/report-templates')->with('success', 'Шаблон удалён');
    }

    private function validateTemplate(Request $request): array
    {
        $sourceKeys = array_keys($this->sources->all());

        $validated = $request->validate([
            'name' => 'required|string|max:255',
            'sections' => 'required|array|min:1',
            'sections.*.source' => ['required', 'string', 'in:'.implode(',', $sourceKeys)],
            'sections.*.title' => 'nullable|string|max:255',
            'sections.*.columns' => 'required|array|min:1',
            'sections.*.columns.*' => 'string',
            'sections.*.filters' => 'nullable|array',
            'sections.*.filters.*.field' => 'required_with:sections.*.filters|string',
            'sections.*.filters.*.value' => 'nullable',
            'required_permissions' => 'nullable|array',
            'required_permissions.*' => 'in:'.implode(',', self::PERMISSION_OPTIONS),
        ]);

        // Допускаем только колонки/поля фильтров, реально существующие у источника секции —
        // защита от рассинхрона формы и произвольных значений в БД.
        $validated['sections'] = array_map(function (array $section) {
            $source = $this->sources->get($section['source']);

            return [
                'source' => $section['source'],
                'title' => $section['title'] ?? $source->label,
                'columns' => array_values(array_intersect($section['columns'], array_keys($source->columns))),
                'filters' => array_values(array_filter(
                    $section['filters'] ?? [],
                    fn (array $filter) => array_key_exists($filter['field'], $source->filterableFields)
                )),
            ];
        }, $validated['sections']);

        $validated['required_permissions'] = array_values($validated['required_permissions'] ?? []);

        return $validated;
    }

    private function sourcesPayload(): array
    {
        return collect($this->sources->all())->map(fn ($source) => [
            'key' => $source->key,
            'label' => $source->label,
            'columns' => $source->columns,
            'filterableFields' => $source->filterableFields,
        ])->values()->all();
    }

    private function authorizeAccess(): void
    {
        $user = Auth::user();

        abort_unless($user->isAdmin() || $user->isChiefDoctor() || $user->isDeputyChief(), 403);
    }
}