<?php

declare(strict_types=1);

namespace Uwil\Storage\Config;

use Uwil\Storage\Exceptions\UnexpectedStorageException;
use Uwil\Storage\Lib\Utils;
use Uwil\Storage\Lib\ValueObjects\DiskName;

final class StorageServiceConfig
{
    private DiskName $default;

    /** @var DiskName[] */
    private array $eligibles;

    /**
     * @param  string[]  $eligibleDisks
     * @param  object{'disk':string,'driver':string}[]  $laravelExistingDisks
     * @param  string[]  $allowedExtensions
     */
    public function __construct(
        private string $defaultDisk,
        private array $eligibleDisks,
        private array $laravelExistingDisks,
        private array $allowedExtensions
    ) {
        if (Utils::diskExists($this->defaultDisk) === false) {
            throw new UnexpectedStorageException('Default disk does not exist');
        }

        array_map(
            fn ($disk) => Utils::diskExists($disk)
                || throw new UnexpectedStorageException("Eligible disk {$disk} does not exist"),
            $this->eligibleDisks
        );

        array_map(
            fn ($disk) => Utils::diskExists($disk->disk)
                || throw new UnexpectedStorageException("Laravel existing disk {$disk->disk} does not exist"),
            $this->laravelExistingDisks
        );

        if (empty($this->laravelExistingDisks)) {
            throw new UnexpectedStorageException('Laravel existing disks cannot be empty');
        }

        if (empty($this->eligibleDisks)) {
            throw new UnexpectedStorageException('Eligible disks cannot be empty');
        }

        $intersect = array_intersect(
            $this->eligibleDisks,
            array_map(fn ($disk) => $disk->disk, $this->laravelExistingDisks)
        );

        if (empty($intersect)) {
            throw new UnexpectedStorageException('No eligible disks exist in Laravel existing disks');
        }

        $intersectWithDrivers = array_map(
            fn ($disk) => $disk,
            array_filter(
                $this->laravelExistingDisks,
                fn ($disk) => in_array($disk->disk, $intersect, true)
            )
        );

        $defaultDiskWithDriver = array_filter(
            $this->laravelExistingDisks,
            fn ($disk) => $disk->disk === $this->defaultDisk
        );

        if (empty($defaultDiskWithDriver)) {
            throw new UnexpectedStorageException('Default disk does not exist in Laravel existing disks');
        }

        $defaultDiskWithDriver = array_values($defaultDiskWithDriver)[0];

        $this->default   = new DiskName($defaultDiskWithDriver->disk, $defaultDiskWithDriver->driver);
        $this->eligibles = array_map(fn ($disk) => new DiskName(
            $disk->disk,
            $disk->driver
        ), $intersectWithDrivers);

        if (empty($this->allowedExtensions)) {
            throw new UnexpectedStorageException('Allowed extensions cannot be empty');
        }

        foreach ($this->allowedExtensions as $extension) {
            if (! is_string($extension) || empty(mb_trim($extension))) {
                throw new UnexpectedStorageException("Allowed extension {$extension} is not valid");
            }
        }
    }

    public function getDefaultDisk(): DiskName
    {
        return $this->default;
    }

    /** @return DiskName[] */
    public function getEligiblesDisks(): array
    {
        return array_map(fn ($disk) => $disk, $this->eligibles);
    }

    public function isDiskEligible(DiskName | string $disk): bool
    {
        $diskName = $disk instanceof DiskName ? $disk->value : (string) $disk;

        foreach ($this->eligibles as $eligible) {
            if ($eligible->value === $diskName) {
                return true;
            }
        }

        return false;
    }

    public function isExtensionAllowed(string $extension): bool
    {
        return in_array(
            strtolower(ltrim($extension, '.')),
            array_map('strtolower', $this->allowedExtensions),
            true
        );
    }

    /** @return string[] */
    public function getAllowedExtensions(): array
    {
        return $this->allowedExtensions;
    }
}