<?php

namespace App\Services;

use App\Models\Service;
use App\Models\ServiceAgendaItem;
use App\Models\Setting;
use Illuminate\Support\Arr;
use Illuminate\Support\Str;

class NameTagResolver
{
    public function __construct(
        private readonly AgendaMatcherService $agendaMatcherService,
    ) {}

    public function moderatorFor(Service $service): ?string
    {
        $override = $this->filledString($service->moderator_name);
        if ($override !== null) {
            return $override;
        }

        $firstAgendaItem = $service->agendaItems()
            ->where('is_before_event', false)
            ->orderBy('sort_order')
            ->orderBy('id')
            ->first();

        return $firstAgendaItem ? $this->namesFromResponsible($firstAgendaItem->responsible) : null;
    }

    public function preacherFor(Service $service): ?string
    {
        $override = $this->filledString($service->preacher_name_override);
        if ($override !== null) {
            return $override;
        }

        $preacherName = $this->filledString($service->preacher_name);
        if ($preacherName !== null) {
            return $preacherName;
        }

        $sermonItem = $service->agendaItems()
            ->where('is_before_event', false)
            ->whereNull('service_song_id')
            ->orderBy('sort_order')
            ->orderBy('id')
            ->get()
            ->first(fn (ServiceAgendaItem $item) => $this->isSermonItem($item));

        return $sermonItem ? $this->namesFromResponsible($sermonItem->responsible) : null;
    }

    private function filledString(?string $value): ?string
    {
        $trimmed = trim((string) $value);

        return $trimmed === '' ? null : $trimmed;
    }

    private function namesFromResponsible(mixed $responsible): ?string
    {
        if (! is_array($responsible) || $responsible === []) {
            return null;
        }

        $people = Arr::isAssoc($responsible) ? [$responsible] : $responsible;

        $names = collect($people)
            ->map(fn (mixed $person) => $this->nameFromResponsiblePerson($person))
            ->filter()
            ->values()
            ->all();

        return $names === [] ? null : implode(', ', $names);
    }

    private function nameFromResponsiblePerson(mixed $person): ?string
    {
        if (is_string($person)) {
            return $this->filledString($person);
        }

        if (! is_array($person)) {
            return null;
        }

        $name = $this->filledString($person['name'] ?? null);
        if ($name !== null) {
            return $name;
        }

        $firstName = $this->filledString($person['firstName'] ?? $person['first_name'] ?? null) ?? '';
        $lastName = $this->filledString($person['lastName'] ?? $person['last_name'] ?? null) ?? '';
        $fullName = trim($firstName.' '.$lastName);

        return $fullName === '' ? null : $fullName;
    }

    private function isSermonItem(ServiceAgendaItem $item): bool
    {
        $configuredPatterns = $this->patternsFromSetting(Setting::get('agenda_sermon_matching'));
        if ($configuredPatterns !== []) {
            return $this->agendaMatcherService->matchesAny($item->title, $configuredPatterns);
        }

        $title = Str::lower($item->title);
        $type = Str::lower($item->type ?? '');

        return str_contains($title, 'predigt')
            || str_contains($title, 'sermon')
            || str_contains($type, 'predigt')
            || str_contains($type, 'sermon');
    }

    /** @return array<int, string> */
    private function patternsFromSetting(?string $patterns): array
    {
        if ($patterns === null || trim($patterns) === '') {
            return [];
        }

        return array_values(array_filter(
            array_map(fn (string $pattern) => trim($pattern), explode(',', $patterns)),
            fn (string $pattern) => $pattern !== '',
        ));
    }
}