<?php

namespace App\Actions\Projects;

use App\Models\ProjectTemplate;
use Illuminate\Support\Arr;
use Illuminate\Support\Facades\DB;

class UpdateProjectTemplate
{
    public function __construct(
        private readonly DuplicateProjectConfiguration $duplicateProjectConfiguration,
    ) {}

    /**
     * @param  array{name: string, copy_areas?: array<int, string>}  $attributes
     */
    public function handle(ProjectTemplate $projectTemplate, array $attributes): ProjectTemplate
    {
        $projectTemplate->loadMissing('sourceProject', 'linkedProjects.projectTemplate');

        $sourceProject = $projectTemplate->sourceProject;
        abort_if($sourceProject === null, 422, 'This template cannot be edited because the source project is missing.');

        $copyAreas = array_values(Arr::get($attributes, 'copy_areas', []));
        $normalizedCopyAreas = $this->duplicateProjectConfiguration->normalizeCopyAreas($copyAreas);
        $previousConfiguration = $projectTemplate->configuration_snapshot ?? [];
        $nextConfiguration = $this->duplicateProjectConfiguration->export($sourceProject, $normalizedCopyAreas);
        $affectedAreas = array_values(array_unique([
            ...array_keys($previousConfiguration),
            ...array_keys($nextConfiguration),
        ]));

        DB::transaction(function () use ($projectTemplate, $attributes, $normalizedCopyAreas, $nextConfiguration, $previousConfiguration, $affectedAreas): void {
            $projectTemplate->forceFill([
                'name' => $attributes['name'],
                'copy_areas' => $normalizedCopyAreas,
                'configuration_snapshot' => $nextConfiguration,
            ])->save();

            foreach ($projectTemplate->linkedProjects as $linkedProject) {
                $currentConfiguration = $this->duplicateProjectConfiguration->export($linkedProject->fresh(), $affectedAreas);
                $replacementConfiguration = [];

                foreach ($nextConfiguration as $area => $configuration) {
                    $isNewTemplateArea = ! array_key_exists($area, $previousConfiguration);
                    $matchesPreviousTemplate = array_key_exists($area, $previousConfiguration)
                        && array_key_exists($area, $currentConfiguration)
                        && $currentConfiguration[$area] === $previousConfiguration[$area];

                    if ($isNewTemplateArea || $matchesPreviousTemplate) {
                        $replacementConfiguration[$area] = $configuration;
                    }
                }

                if ($replacementConfiguration === []) {
                    continue;
                }

                $this->duplicateProjectConfiguration->apply($linkedProject->fresh(), $replacementConfiguration);
            }
        });

        return $projectTemplate->fresh(['sourceProject'])->loadCount('linkedProjects');
    }
}