<?php
if (!defined("_PS_VERSION_")) {
    exit();
}

class EcomZoneCategoryHandler implements ICategory
{
    private int $defaultLangId;
    private array $categoryCache = [];
    private array $categoryLinkRewriteCache = [];
    private int $defaultShopId;

    public function __construct()
    {
        $this->defaultLangId = (int) Configuration::get("PS_LANG_DEFAULT");
        $this->defaultShopId = (int) Context::getContext()->shop->id;

        EcomZoneLogger::log("Category Handler initialized", "INFO", [
            "default_lang" => $this->defaultLangId,
            "shop_id" => $this->defaultShopId,
        ]);
    }

    public function createCategory(string $name, ?int $parentId = null): int
    {
        try {
            if (isset($this->categoryCache[$name])) {
                return $this->categoryCache[$name];
            }

            $parentId =
                $parentId ?: (int) Configuration::get("PS_HOME_CATEGORY");

            $category = new Category();
            $category->name = [$this->defaultLangId => trim($name)];
            $category->link_rewrite = [
                $this->defaultLangId => $this->generateLinkRewrite($name),
            ];
            $category->id_parent = $parentId;
            $category->active = true;
            $category->id_shop_default = $this->defaultShopId;

            // Set shop association for multistore
            if (Shop::isFeatureActive()) {
                $category->id_shop_list = [$this->defaultShopId];
            }

            if (!$category->add()) {
                throw new EcomZoneException(
                    "Failed to create category: $name",
                    EcomZoneException::CATEGORY_CREATE_ERROR
                );
            }

            $this->categoryCache[$name] = (int) $category->id;

            EcomZoneLogger::log("Category created", "INFO", [
                "name" => $name,
                "id" => $category->id,
                "parent_id" => $parentId,
            ]);

            return $this->categoryCache[$name];
        } catch (Exception $e) {
            EcomZoneLogger::log("Category creation failed", "ERROR", [
                "name" => $name,
                "error" => $e->getMessage(),
            ]);
            throw new EcomZoneException(
                "Category creation failed: " . $e->getMessage(),
                EcomZoneException::CATEGORY_CREATE_ERROR,
                $e
            );
        }
    }

    public function getCategoryIdByName(string $name, ?int $parentId = null): ?int
    {
        try {
            if (isset($this->categoryCache[$name])) {
                return $this->categoryCache[$name];
            }

            $name = trim($name);
            $sql = 'SELECT c.id_category
                    FROM `' .
                        _DB_PREFIX_ .
                        'category_lang` cl
                    JOIN `' .
                        _DB_PREFIX_ .
                        'category` c ON c.id_category = cl.id_category
                    WHERE cl.name = "' .
                        pSQL($name) .
                        '"
                    AND cl.id_lang = ' .
                        (int) $this->defaultLangId .
                        '
                    AND c.active = 1';

            if ($parentId !== null) {
                $sql .= ' AND c.id_parent = ' . (int) $parentId;
            }

            $categoryId = (int) Db::getInstance()->getValue($sql);

            if ($categoryId) {
                $this->categoryCache[$name] = $categoryId;
                return $categoryId;
            }

            return null;
        } catch (Exception $e) {
            EcomZoneLogger::log("Category lookup failed", "ERROR", [
                "name" => $name,
                "error" => $e->getMessage(),
            ]);
            return null;
        }
    }

    public function processCategoriesFromString(string $categories): array
    {
        $categoryNames = array_map('trim', explode('>', $categories));
        $categoryIds = [];
        $parentId = null;

        foreach ($categoryNames as $name) {
            $categoryId = $this->getCategoryIdByName($name, $parentId);
            if (!$categoryId) {
                $categoryId = $this->createCategory($name, $parentId);
            }
            if ($categoryId) {
                $categoryIds[] = $categoryId;
                $parentId = $categoryId;
            }
        }

        return $categoryIds;
    }

    private function generateLinkRewrite(string $name): string
    {
        if (isset($this->categoryLinkRewriteCache[$name])) {
            return $this->categoryLinkRewriteCache[$name];
        }

        $linkRewrite = Tools::str2url($name);

        // Ensure uniqueness
        $suffix = 1;
        $originalLinkRewrite = $linkRewrite;
        while ($this->linkRewriteExists($linkRewrite)) {
            $linkRewrite = $originalLinkRewrite . "-" . $suffix++;
        }

        $this->categoryLinkRewriteCache[$name] = $linkRewrite;
        return $linkRewrite;
    }

    private function linkRewriteExists(string $linkRewrite): bool
    {
        return (bool) Db::getInstance()->getValue(
            'SELECT COUNT(*)
            FROM `' .
                _DB_PREFIX_ .
                'category_lang` cl
            JOIN `' .
                _DB_PREFIX_ .
                'category_shop` cs
                ON cl.id_category = cs.id_category
            WHERE cl.link_rewrite = "' .
                pSQL($linkRewrite) .
                '"
            AND cl.id_lang = ' .
                (int) $this->defaultLangId .
                '
            AND cs.id_shop = ' .
                (int) $this->defaultShopId
        );
    }

    public function createCategoryPath(array $categoryNames): int
    {
        $parentId = (int) Configuration::get("PS_HOME_CATEGORY");
        $lastCategoryId = $parentId;

        foreach ($categoryNames as $categoryName) {
            $categoryName = trim($categoryName);
            if (empty($categoryName)) {
                continue;
            }

            try {
                $categoryId = $this->getCategoryIdByName($categoryName);
                if (!$categoryId) {
                    $categoryId = $this->createCategory(
                        $categoryName,
                        $parentId
                    );
                }
                $lastCategoryId = $categoryId;
                $parentId = $categoryId;
            } catch (Exception $e) {
                EcomZoneLogger::log("Category path creation failed", "ERROR", [
                    "category" => $categoryName,
                    "error" => $e->getMessage(),
                ]);
                break;
            }
        }

        return $lastCategoryId;
    }
}