<?php

declare(strict_types=1);

namespace App\Services;

use App\Models\PageBlock;
use App\Models\PreregistrationPage;
use Illuminate\Http\Request;
use Illuminate\Http\UploadedFile;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Storage;

class PreregistrationPageBlockWriter
{
    /**
     * @param  array<int, array<string, mixed>>  $blocks
     */
    public function replaceBlocks(PreregistrationPage $page, array $blocks, Request $request): void
    {
        DB::transaction(function () use ($page, $blocks, $request): void {
            $page->load('blocks');
            $oldPaths = $this->collectBlockImagePaths($page);
            $page->blocks()->delete();

            $orderedKeys = array_keys($blocks);
            usort($orderedKeys, function (string|int $a, string|int $b) use ($blocks): int {
                /** @var array<string, mixed> $rowA */
                $rowA = $blocks[$a];
                /** @var array<string, mixed> $rowB */
                $rowB = $blocks[$b];

                return ((int) ($rowA['sort_order'] ?? 0)) <=> ((int) ($rowB['sort_order'] ?? 0));
            });

            $allNewPaths = [];
            foreach ($orderedKeys as $blockKey) {
                /** @var array<string, mixed> $blockRow */
                $blockRow = $blocks[$blockKey];
                $type = (string) $blockRow['type'];
                /** @var array<string, mixed> $content */
                $content = is_array($blockRow['content'] ?? null) ? $blockRow['content'] : [];
                if ($type === 'text' && array_key_exists('body', $content) && is_string($content['body'])) {
                    $content['body'] = ltrim($content['body']);
                }
                if ($type === 'image') {
                    $content = $this->mergeImageBlockFiles($page, (string) $blockKey, $content, $request);
                }
                $allNewPaths = array_merge($allNewPaths, $this->pathsFromImageTypeContent($type, $content));

                PageBlock::query()->create([
                    'preregistration_page_id' => $page->id,
                    'type' => $type,
                    'content' => $content,
                    'sort_order' => (int) ($blockRow['sort_order'] ?? 0),
                    'is_visible' => (bool) ($blockRow['is_visible'] ?? true),
                ]);
            }

            $allNewPaths = array_values(array_unique($allNewPaths));
            foreach (array_diff($oldPaths, $allNewPaths) as $orphan) {
                if (is_string($orphan) && $orphan !== '') {
                    Storage::disk('public')->delete($orphan);
                }
            }
        });
    }

    public function seedDefaultBlocks(PreregistrationPage $page): void
    {
        $rows = [
            [
                'type' => 'hero',
                'sort_order' => 0,
                'is_visible' => true,
                'content' => [
                    'headline' => $page->title,
                    'subheadline' => '',
                    'eyebrow_text' => '',
                    'eyebrow_style' => 'badge',
                    'text_alignment' => 'center',
                ],
            ],
        ];

        $next = 1;
        if ($page->start_date->isFuture()) {
            $rows[] = [
                'type' => 'countdown',
                'sort_order' => $next,
                'is_visible' => true,
                'content' => [
                    'target_datetime' => $page->start_date->toIso8601String(),
                    'title' => 'De pre-registratie opent over:',
                    'expired_action' => 'reload',
                    'style' => 'large',
                    'show_labels' => true,
                    'labels' => [
                        'days' => 'dagen',
                        'hours' => 'uren',
                        'minutes' => 'minuten',
                        'seconds' => 'seconden',
                    ],
                ],
            ];
            $next++;
        }

        $rows[] = [
            'type' => 'benefits',
            'sort_order' => $next,
            'is_visible' => true,
            'content' => [
                'title' => 'Waarom voorregistreren?',
                'items' => [
                    ['icon' => 'ticket', 'text' => 'Exclusieve korting op tickets'],
                    ['icon' => 'clock', 'text' => 'Eerder toegang tot de ticketshop'],
                ],
                'layout' => 'list',
                'max_columns' => 2,
            ],
        ];
        $next++;

        $rows[] = [
            'type' => 'social_proof',
            'sort_order' => $next,
            'is_visible' => true,
            'content' => [
                'template' => 'Al {count} bezoekers aangemeld!',
                'min_count' => 10,
                'show_animation' => true,
                'style' => 'pill',
            ],
        ];
        $next++;

        $rows[] = [
            'type' => 'form',
            'sort_order' => $next,
            'is_visible' => true,
            'content' => [
                'title' => 'Registreer nu',
                'description' => '',
                'button_label' => 'Registreer nu!',
                'button_color' => '#F47B20',
                'button_text_color' => '#FFFFFF',
                'fields' => [
                    'first_name' => [
                        'enabled' => true,
                        'required' => true,
                        'label' => 'Voornaam',
                        'placeholder' => 'Je voornaam',
                    ],
                    'last_name' => [
                        'enabled' => true,
                        'required' => true,
                        'label' => 'Achternaam',
                        'placeholder' => 'Je achternaam',
                    ],
                    'email' => [
                        'enabled' => true,
                        'required' => true,
                        'label' => 'E-mailadres',
                        'placeholder' => 'je@email.nl',
                    ],
                    'phone' => [
                        'enabled' => false,
                        'required' => false,
                        'label' => 'Mobiel',
                        'placeholder' => '+31 6 12345678',
                    ],
                ],
                'show_field_icons' => true,
                'privacy_text' => 'Door je te registreren ga je akkoord met onze privacyverklaring.',
                'privacy_url' => '',
            ],
        ];

        $page->blocks()->createMany($rows);
    }

    /**
     * @return list<string>
     */
    private function collectBlockImagePaths(PreregistrationPage $page): array
    {
        $paths = [];
        foreach ($page->blocks as $b) {
            if ($b->type !== 'image') {
                continue;
            }
            $paths = array_merge($paths, $this->pathsFromImageTypeContent('image', is_array($b->content) ? $b->content : []));
        }

        return array_values(array_unique($paths));
    }

    /**
     * @param  array<string, mixed>  $content
     * @return list<string>
     */
    private function pathsFromImageTypeContent(string $type, array $content): array
    {
        if ($type !== 'image') {
            return [];
        }
        $p = data_get($content, 'image');
        if (is_string($p) && $p !== '') {
            return [$p];
        }

        return [];
    }

    /**
     * @param  array<string, mixed>  $content
     * @return array<string, mixed>
     */
    private function mergeImageBlockFiles(PreregistrationPage $page, string $blockKey, array $content, Request $request): array
    {
        $disk = Storage::disk('public');
        $dir = "preregister/pages/{$page->id}";

        $link = $content['link_url'] ?? null;
        $content['link_url'] = is_string($link) && trim($link) !== '' ? trim($link) : null;

        if ($request->boolean("blocks.$blockKey.remove_block_image")) {
            $prev = $content['image'] ?? null;
            if (is_string($prev) && $prev !== '') {
                $disk->delete($prev);
            }
            $content['image'] = null;
        }

        $file = $request->file("blocks.$blockKey.block_image");
        if ($this->isValidUpload($file)) {
            if (isset($content['image']) && is_string($content['image']) && $content['image'] !== '') {
                $disk->delete($content['image']);
            }
            $content['image'] = $file->store($dir, 'public');
        }

        return $content;
    }

    private function isValidUpload(?UploadedFile $file): bool
    {
        return $file !== null && $file->isValid();
    }
}