<?php

namespace App\Services\Web;

use App\Enums\Portal;
use App\Models\Category;
use App\Models\Company;
use App\Models\PressRelease;
use App\Support\EditorialClock;
use Illuminate\Database\Eloquent\Builder;
use Illuminate\Support\Carbon;
use Illuminate\Support\Str;

/**
 * Datenaufbereitung der öffentlichen Startseite einer Ausgabe: Lead-/Seiten-/
 * meistgelesene Meldungen, aktive Newsrooms, Branchen-Index, „Heute im Fokus"
 * (Spotlight), Ticker und Kennzahlen.
 */
class HomePageData
{
    /**
     * @return array<string, mixed>
     */
    public function build(Portal $portal, string $language = 'de'): array
    {
        $portalValues = [$portal->value, Portal::Both->value];

        // Aktualitäts-Stichtag an den jüngsten Datensatz koppeln (historisches Archiv).
        $referenceNow = EditorialClock::reference($portalValues, $language);
        $recentSince = $referenceNow->copy()->subDays(7);
        $previousSince = $referenceNow->copy()->subDays(14);

        $publishedQuery = static fn (): Builder => PressRelease::query()
            ->forPortalValues($portalValues)
            ->forLanguage($language)
            ->visibleInArchive();

        $with = [
            'company',
            'category.translations' => fn ($query) => $query->where('locale', $language),
            'images' => fn ($query) => $query
                ->orderByDesc('is_preview')
                ->orderBy('sort_order')
                ->limit(1),
        ];

        $oldestPublishedAt = $publishedQuery()
            ->oldest('published_at')
            ->value('published_at');

        $leadRelease = $publishedQuery()
            ->with($with)
            ->orderByDesc('published_at')
            ->first();

        $sideReleases = $publishedQuery()
            ->with($with)
            ->when($leadRelease, fn (Builder $query) => $query->where('id', '!=', $leadRelease->id))
            ->orderByDesc('published_at')
            ->limit(4)
            ->get();

        $mostReadReleases = $publishedQuery()
            ->orderByDesc('hits')
            ->orderByDesc('published_at')
            ->limit(4)
            ->get(['id', 'slug', 'title', 'hits', 'portal', 'language']);

        $activeNewsrooms = Company::query()
            ->whereIn('portal', $portalValues)
            ->where('is_active', true)
            ->whereHas('pressReleases', function (Builder $query) use ($portalValues, $recentSince, $language): void {
                $query
                    ->forPortalValues($portalValues)
                    ->forLanguage($language)
                    ->published()
                    ->where('published_at', '>=', $recentSince);
            })
            ->withCount([
                'pressReleases as recent_releases_count' => function (Builder $query) use ($portalValues, $recentSince, $language): void {
                    $query
                        ->forPortalValues($portalValues)
                        ->forLanguage($language)
                        ->published()
                        ->where('published_at', '>=', $recentSince);
                },
                'pressReleases as today_releases_count' => function (Builder $query) use ($portalValues, $referenceNow, $language): void {
                    $query
                        ->forPortalValues($portalValues)
                        ->forLanguage($language)
                        ->published()
                        ->whereDate('published_at', $referenceNow->toDateString());
                },
            ])
            ->orderByDesc('today_releases_count')
            ->orderByDesc('recent_releases_count')
            ->limit(6)
            ->get()
            ->map(fn (Company $company): array => [
                'name' => $company->name,
                'slug' => $company->slug,
                'initial' => mb_strtoupper(mb_substr((string) $company->name, 0, 1)),
                'count' => (int) $company->recent_releases_count,
                'today' => (int) $company->today_releases_count > 0,
            ]);

        $industryIndex = Category::query()
            ->with(['translations' => fn ($query) => $query->where('locale', $language)])
            ->withCount([
                'pressReleases as recent_count' => function (Builder $query) use ($portalValues, $recentSince, $language): void {
                    $query
                        ->forPortalValues($portalValues)
                        ->forLanguage($language)
                        ->published()
                        ->where('published_at', '>=', $recentSince);
                },
                'pressReleases as previous_count' => function (Builder $query) use ($portalValues, $recentSince, $previousSince, $language): void {
                    $query
                        ->forPortalValues($portalValues)
                        ->forLanguage($language)
                        ->published()
                        ->where('published_at', '>=', $previousSince)
                        ->where('published_at', '<', $recentSince);
                },
            ])
            ->whereIn('portal', $portalValues)
            ->where('is_active', true)
            ->whereNull('parent_id')
            ->orderByDesc('recent_count')
            ->limit(7)
            ->get()
            ->map(function (Category $category): ?array {
                $translation = $category->translations->first();

                if (! $translation) {
                    return null;
                }

                return [
                    'name' => $translation->name,
                    'href' => $translation->slug ? route('kategorie', ['slug' => $translation->slug]) : route('web.home'),
                    'count' => (int) ($category->recent_count ?? 0),
                    'delta' => (int) ($category->recent_count ?? 0) - (int) ($category->previous_count ?? 0),
                ];
            })
            ->filter()
            ->values();

        // "Heute im Fokus · Branche": aktivste Top-Rubrik im Stichtag-Fenster mit echten Meldungen.
        $spotlightCategory = Category::query()
            ->with(['translations' => fn ($query) => $query->where('locale', $language)])
            ->withCount([
                'pressReleases as window_count' => function (Builder $query) use ($portalValues, $recentSince, $referenceNow, $language): void {
                    $query
                        ->forPortalValues($portalValues)
                        ->forLanguage($language)
                        ->published()
                        ->where('published_at', '>=', $recentSince)
                        ->where('published_at', '<=', $referenceNow);
                },
            ])
            ->whereIn('portal', $portalValues)
            ->where('is_active', true)
            ->whereNull('parent_id')
            ->orderByDesc('window_count')
            ->first();

        $spotlight = null;

        if ($spotlightCategory && $spotlightTranslation = $spotlightCategory->translations->first()) {
            $spotlightBase = static fn (): Builder => PressRelease::query()
                ->forPortalValues($portalValues)
                ->forLanguage($language)
                ->visibleInArchive()
                ->where('category_id', $spotlightCategory->id);

            $spotlightReleases = $spotlightBase()
                ->with(['company'])
                ->orderByDesc('published_at')
                ->limit(3)
                ->get()
                ->map(static function (PressRelease $release) use ($spotlightTranslation): array {
                    $words = str_word_count(strip_tags((string) $release->text));
                    $publishedAt = $release->published_at;

                    return [
                        'time' => $publishedAt?->format('H:i') ?? '',
                        'date' => $publishedAt?->translatedFormat('j. M') ?? '',
                        'category' => $spotlightTranslation->name,
                        'title' => $release->title,
                        'company' => $release->company?->name ?? '',
                        'city' => null,
                        'minutes' => max(1, (int) ceil($words / 200)),
                        'href' => $release->slug ? route('release.detail', ['slug' => $release->slug]) : '#',
                    ];
                });

            if ($spotlightReleases->isNotEmpty()) {
                $windowCount = (int) ($spotlightCategory->window_count ?? 0);
                $archiveCount = $spotlightBase()->count();
                $activeCompanies = (clone $spotlightBase())
                    ->where('published_at', '>=', $recentSince)
                    ->where('published_at', '<=', $referenceNow)
                    ->distinct()
                    ->count('company_id');

                $spotlight = [
                    'industry' => $spotlightTranslation->name,
                    'stats' => [
                        ['label' => 'Meldungen (7 Tage)', 'value' => number_format($windowCount, 0, ',', '.'), 'sub' => 'Stand '.$referenceNow->translatedFormat('j. M Y')],
                        ['label' => 'Aktive Unternehmen', 'value' => number_format($activeCompanies, 0, ',', '.'), 'sub' => 'in dieser Branche'],
                        ['label' => 'Im Archiv', 'value' => number_format($archiveCount, 0, ',', '.'), 'sub' => 'Meldungen gesamt'],
                    ],
                    'releases' => $spotlightReleases->all(),
                ];
            }
        }

        // Ad-Hoc-Ticker aus den jüngsten echten Pressemitteilungen.
        $tickerItems = $publishedQuery()
            ->orderByDesc('published_at')
            ->limit(8)
            ->get(['id', 'title', 'published_at'])
            ->map(static fn (PressRelease $release): array => [
                'time' => $release->published_at?->format('H:i') ?? '',
                'text' => Str::limit((string) $release->title, 70),
            ])
            ->all();

        return [
            'leadRelease' => $leadRelease,
            'sideReleases' => $sideReleases,
            'mostReadReleases' => $mostReadReleases,
            'activeNewsrooms' => $activeNewsrooms,
            'industryIndex' => $industryIndex,
            'spotlight' => $spotlight,
            'tickerItems' => $tickerItems,
            'homeStats' => [
                'publishedCount' => $publishedQuery()->count(),
                'publishedToday' => $publishedQuery()->whereDate('published_at', $referenceNow->toDateString())->count(),
                'archiveSince' => $oldestPublishedAt ? (int) Carbon::parse($oldestPublishedAt)->format('Y') : null,
            ],
        ];
    }
}