<?php

namespace App\Services;

use App\Models\Song;
use ProPresenter\Parser\ProFileGenerator;

class ProExportService
{
    public function generateProFile(Song $song): string
    {
        $song->loadMissing(['groups.slides', 'arrangements.arrangementGroups.group']);

        $groups = $this->buildGroups($song);
        $arrangements = $this->buildArrangements($song);
        $ccli = $this->buildCcliMetadata($song);

        $tempPath = sys_get_temp_dir() . '/' . uniqid('pro-export-') . '.pro';

        ProFileGenerator::generateAndWrite($tempPath, $song->title, $groups, $arrangements, $ccli);

        return $tempPath;
    }

    private function buildGroups(Song $song): array
    {
        $groups = [];

        foreach ($song->groups->sortBy('order') as $group) {
            $slides = [];

            foreach ($group->slides->sortBy('order') as $slide) {
                $slideData = ['text' => $slide->text_content ?? ''];

                if ($slide->text_content_translated) {
                    $slideData['translation'] = $slide->text_content_translated;
                }

                $slides[] = $slideData;
            }

            $groups[] = [
                'name' => $group->name,
                'color' => ProImportService::hexToRgba($group->color),
                'slides' => $slides,
            ];
        }

        return $groups;
    }

    private function buildArrangements(Song $song): array
    {
        $arrangements = [];
        $groupIdToName = $song->groups->pluck('name', 'id')->toArray();

        foreach ($song->arrangements as $arrangement) {
            $groupNames = $arrangement->arrangementGroups
                ->sortBy('order')
                ->map(fn ($ag) => $groupIdToName[$ag->song_group_id] ?? null)
                ->filter()
                ->values()
                ->toArray();

            $arrangements[] = [
                'name' => $arrangement->name,
                'groupNames' => $groupNames,
            ];
        }

        return $arrangements;
    }

    private function buildCcliMetadata(Song $song): array
    {
        return array_filter([
            'author' => $song->author,
            'song_title' => $song->title,
            'copyright_year' => $song->copyright_year,
            'publisher' => $song->publisher,
            'song_number' => $song->ccli_id ? (int) $song->ccli_id : null,
        ]);
    }
}