<?php
namespace Tests\Extension;

use FilesystemIterator;
use PDO;
use PDOException;

class TestSeeder
{
    public function __construct(protected PDO $connection) {}

    public function run(): void
    {
        $seedClasses = $this->getSeedClasses();
        $orderedSeeds = $this->orderedSeeds($seedClasses);
        foreach ($orderedSeeds as $seed) {
            $seed->run();
        }
    }

    protected function getSeedClasses(): array
    {
        $seedsFolder = implode(DIRECTORY_SEPARATOR, [__DIR__, 'Seeds']);
        $files = new FilesystemIterator($seedsFolder, FilesystemIterator::SKIP_DOTS);
        $seeds = [];
        foreach ($files as $file) {
            $seeds []= $this->buildClassName($file->getBasename('.php'));
        }
        return $seeds;
    }
    protected function getSeed(string $seedClassName): SeedInterface
    {
        return new $seedClassName($this->connection);
    }

    protected function buildClassName(string $fileBaseName): string
    {
        $namespace = implode('\\', [__NAMESPACE__, 'Seeds']);
        return implode('\\', [$namespace, $fileBaseName]);
    }

    protected function orderedSeeds(array $seedClasses): array
    {
        $orderedSeeds = [];
        foreach ($seedClasses as $seedClassName) {
            $seed = $this->getSeed($seedClassName);
            if ($seed->getDependencies() === []) {
                $orderedSeeds[$seedClassName] = $seed;
                continue;
            }
            $orderedSeeds = array_merge($orderedSeeds, $this->orderedDependencies($orderedSeeds, $seedClasses, $seedClassName));
        }
        return $orderedSeeds;
    }

    protected function orderedDependencies(array $orderedSeeds, array $seedClasses, string $seedClassName): array
    {
        $seed = $this->getSeed($seedClassName);
        $dependencies = $seed->getDependencies();
        foreach ($dependencies as $dependencyClass) {
            if (!array_key_exists($dependencyClass, $orderedSeeds)) {
                $orderedSeeds = array_merge($orderedSeeds, $this->orderedDependencies($orderedSeeds, $seedClasses, $dependencyClass));
            }
        }
        if (!array_key_exists($seedClassName, $orderedSeeds)) {
            $orderedSeeds[$seedClassName] = $seed;
        }
        return $orderedSeeds;
    }
}