<?php
declare(strict_types=1);

namespace Esun\Catalog\Model;

use Magento\Framework\Module\Dir\Reader as ModuleDirReader;
use Magento\Framework\Serialize\Serializer\Json;

class PrintingParameter
{
    private ?array $data = null;
    private ?array $groups = null;

    public function __construct(
        private readonly ModuleDirReader $moduleDirReader,
        private readonly Json $json
    ) {
    }

    public function getByProductName(string $productName): array
    {
        $data = $this->getData();
        if (!$data) {
            return [];
        }

        $productName = trim($productName);
        if ($productName === '') {
            return [];
        }

        if (isset($data[$productName]) && is_array($data[$productName])) {
            return $this->withGroupConfig($data[$productName]);
        }

        $normalizedProductName = $this->normalizeName($productName);
        foreach ($data as $name => $parameters) {
            if ($this->normalizeName((string)$name) === $normalizedProductName && is_array($parameters)) {
                return $this->withGroupConfig($parameters);
            }
        }

        uksort($data, static fn (string $a, string $b): int => strlen($b) <=> strlen($a));
        foreach ($data as $name => $parameters) {
            $normalizedName = $this->normalizeName((string)$name);
            if ($normalizedName !== ''
                && (str_contains($normalizedProductName, $normalizedName) || str_contains($normalizedName, $normalizedProductName))
                && is_array($parameters)
            ) {
                return $this->withGroupConfig($parameters);
            }
        }

        return [];
    }

    /**
     * @return array<string, array<string, array{icon: string, items: array}>>
     */
    public function getAll(): array
    {
        $result = [];
        foreach ($this->getData() as $name => $parameters) {
            if (is_array($parameters)) {
                $result[(string)$name] = $this->withGroupConfig($parameters);
            }
        }

        return $result;
    }

    private function getData(): array
    {
        if ($this->data !== null) {
            return $this->data;
        }

        $path = $this->moduleDirReader->getModuleDir('', 'Esun_Catalog') . '/data/printing-parameters.json';
        if (!is_file($path)) {
            return $this->data = [];
        }

        try {
            $decoded = $this->json->unserialize((string)file_get_contents($path));
            return $this->data = is_array($decoded) ? $decoded : [];
        } catch (\InvalidArgumentException) {
            return $this->data = [];
        }
    }

    private function getGroups(): array
    {
        if ($this->groups !== null) {
            return $this->groups;
        }

        $path = $this->moduleDirReader->getModuleDir('', 'Esun_Catalog') . '/data/printing-parameter-groups.json';
        if (!is_file($path)) {
            return $this->groups = [];
        }

        try {
            $decoded = $this->json->unserialize((string)file_get_contents($path));
            return $this->groups = is_array($decoded) ? $decoded : [];
        } catch (\InvalidArgumentException) {
            return $this->groups = [];
        }
    }

    private function withGroupConfig(array $parameters): array
    {
        $groups = $this->getGroups();
        $result = [];
        foreach ($parameters as $groupName => $items) {
            if (!is_array($items)) {
                continue;
            }

            $result[(string)$groupName] = [
                'icon' => (string)($groups[$groupName]['icon'] ?? ''),
                'items' => $items,
            ];
        }

        return $result;
    }

    private function normalizeName(string $name): string
    {
        $name = strtolower($name);
        return preg_replace('/[^a-z0-9]+/', '', $name) ?: '';
    }
}