<?php

namespace App\Services;

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

class ProExportService
{
    public function __construct(
        private readonly MacroResolutionService $macroResolutionService,
        private readonly ServiceImageResolver $imageResolver,
    ) {}

    public function generateProFile(Song $song, ?Service $service = null): string
    {
        $tempPath = sys_get_temp_dir().'/'.uniqid('pro-export-').'.pro';

        ProFileGenerator::generateAndWrite(
            $tempPath,
            $song->title,
            $this->buildGroups($song, $service),
            $this->buildArrangements($song),
            $this->buildCcliMetadata($song),
        );

        return $tempPath;
    }

    public function generateParserSong(Song $song, ?Service $service = null): \ProPresenter\Parser\Song
    {
        $song->loadMissing(['arrangements.arrangementSections.section.slides', 'arrangements.arrangementSections.section.label']);

        return ProFileGenerator::generate(
            $song->title,
            $this->buildGroups($song, $service),
            $this->buildArrangements($song),
            $this->buildCcliMetadata($song),
        );
    }

    private function buildGroups(Song $song, ?Service $service = null): array
    {
        $defaultArr = $song->arrangements->firstWhere('is_default', true) ?? $song->arrangements->first();

        if ($defaultArr === null) {
            return [];
        }

        $defaultArr->loadMissing('arrangementSections.section.slides', 'arrangementSections.section.label');

        $groups = [];
        $seenSectionIds = [];
        $background = $this->backgroundData($service);

        foreach ($defaultArr->arrangementSections->sortBy('order') as $arrangementSection) {
            $section = $arrangementSection->section;
            $label = $section?->label;

            if ($section === null || $label === null) {
                continue;
            }

            if (in_array($section->id, $seenSectionIds, true)) {
                continue;
            }
            $seenSectionIds[] = $section->id;

            $slides = [];
            $sectionSlides = $section->slides->sortBy('order')->values();
            $totalSlides = $sectionSlides->count();

            foreach ($sectionSlides as $slideIndex => $slide) {
                $slideData = ['text' => $slide->text_content ?? ''];

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

                if ($background !== null && ! $this->isFullCoverImageSlide($slide, $slideData)) {
                    $slideData['background'] = $background;
                }

                if ($service !== null) {
                    $macros = $this->macroResolutionService->macrosForSlide(
                        $service,
                        'song',
                        ['index' => $slideIndex, 'total' => $totalSlides, 'label_id' => $label->id],
                    );

                    if (! empty($macros)) {
                        // ProPresenter parser currently supports one `macro` entry per slide; keep the first resolved macro until stacked macros are supported.
                        $slideData['macro'] = $macros[0];
                    }
                }

                $slides[] = $slideData;
            }

            $groups[] = [
                'name' => $label->name,
                'color' => ProImportService::hexToRgba($label->color ?? '#808080'),
                'slides' => $slides,
            ];
        }

        return $groups;
    }

    private function backgroundData(?Service $service): ?array
    {
        if ($service === null) {
            return null;
        }

        $background = $this->imageResolver->backgroundFor($service);

        if ($background === null) {
            return null;
        }

        return [
            'path' => ServiceImageResolver::BACKGROUND_EXPORT_NAME,
            'format' => 'JPG',
            'width' => 1920,
            'height' => 1080,
            'bundleRelative' => true,
        ];
    }

    private function isFullCoverImageSlide(object $slide, array $slideData): bool
    {
        if (! isset($slideData['media'])) {
            return false;
        }

        return ($slide->cover_mode ?? null) === true;
    }

    private function buildArrangements(Song $song): array
    {
        $arrangements = [];

        foreach ($song->arrangements as $arrangement) {
            $arrangement->loadMissing('arrangementSections.section.label');

            $groupNames = $arrangement->arrangementSections
                ->sortBy('order')
                ->map(fn ($arrangementSection) => $arrangementSection->section?->label?->name)
                ->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,
        ]);
    }
}