<?php
/**
 * @package AKSRT
 */

namespace AKSRT\Shop;

defined('ABSPATH') || exit;

class AddressService {

    private Shop $shop;

    public function __construct(Shop $shop) {
        $this->shop = $shop;
    }

    /**
     * 获取用户地址簿（公开接口）
     */
    public function get_address_book(int $user_id): array {
        return $this->get_user_address_book($user_id);
    }

    public function get_user_address_book(int $user_id): array {
        $saved = get_user_meta($user_id, 'aksrt_shop_addresses', true);
        if (is_array($saved) && !empty($saved)) {
            return array_values(array_filter(array_map([$this, 'sanitize_address'], $saved)));
        }

        return [];
    }

    private function sanitize_address($address): array {
        if (!is_array($address)) {
            return [];
        }

        $name = sanitize_text_field((string) ($address['name'] ?? ''));
        $phone = sanitize_text_field((string) ($address['phone'] ?? ''));
        $province = sanitize_text_field((string) ($address['province'] ?? ''));
        $city = sanitize_text_field((string) ($address['city'] ?? ''));
        $district = sanitize_text_field((string) ($address['district'] ?? ''));
        $street = sanitize_text_field((string) ($address['address'] ?? ''));

        return [
            'id' => (int) ($address['id'] ?? 0),
            'name' => $name,
            'phone' => $phone,
            'province' => $province,
            'city' => $city,
            'district' => $district,
            'address' => $street,
            'is_default' => !empty($address['is_default']),
            'full_text' => trim($name . ' / ' . $province . $city . $district . $street),
        ];
    }

    /**
     * 新增地址
     *
     * @param int   $user_id
     * @param array $data 地址数据（name, phone, province, city, district, address, is_default）
     * @return array{success:bool, address:array|null, error:string|null}
     */
    public function add_address(int $user_id, array $data): array {
        $address = $this->sanitize_address($data);
        if ($address['name'] === '' || $address['phone'] === '' || $address['address'] === '') {
            return ['success' => false, 'address' => null, 'error' => __('姓名、手机号和详细地址为必填项。', 'aksrt')];
        }

        $book = $this->get_user_address_book($user_id);
        $address['id'] = $this->next_address_id($book);

        if (!empty($data['is_default']) || empty($book)) {
            foreach ($book as &$item) {
                $item['is_default'] = false;
            }
            $address['is_default'] = true;
        }

        $book[] = $address;
        update_user_meta($user_id, 'aksrt_shop_addresses', $book);

        return ['success' => true, 'address' => $address, 'error' => null];
    }

    /**
     * 更新地址
     *
     * @param int   $user_id
     * @param int   $address_id
     * @param array $data
     * @return array{success:bool, address:array|null, error:string|null}
     */
    public function update_address(int $user_id, int $address_id, array $data): array {
        $book = $this->get_user_address_book($user_id);
        $found = false;

        foreach ($book as &$item) {
            if ((int) ($item['id'] ?? 0) !== $address_id) {
                continue;
            }
            $found = true;
            $merged = array_merge($item, $this->sanitize_address(array_merge($item, $data)));
            $merged['id'] = $address_id;

            if ($merged['name'] === '' || $merged['phone'] === '' || $merged['address'] === '') {
                return ['success' => false, 'address' => null, 'error' => __('姓名、手机号和详细地址为必填项。', 'aksrt')];
            }

            if (!empty($data['is_default'])) {
                foreach ($book as &$clear) {
                    $clear['is_default'] = false;
                }
                $merged['is_default'] = true;
            }

            $item = $merged;
            break;
        }

        if (!$found) {
            return ['success' => false, 'address' => null, 'error' => __('地址不存在。', 'aksrt')];
        }

        update_user_meta($user_id, 'aksrt_shop_addresses', $book);

        return ['success' => true, 'address' => $merged, 'error' => null];
    }

    /**
     * 删除地址
     *
     * @param int $user_id
     * @param int $address_id
     * @return array{success:bool, error:string|null}
     */
    public function delete_address(int $user_id, int $address_id): array {
        $book = $this->get_user_address_book($user_id);
        $found = false;
        $was_default = false;
        $filtered = [];

        foreach ($book as $item) {
            if ((int) ($item['id'] ?? 0) === $address_id) {
                $found = true;
                $was_default = !empty($item['is_default']);
                continue;
            }
            $filtered[] = $item;
        }

        if (!$found) {
            return ['success' => false, 'error' => __('地址不存在。', 'aksrt')];
        }

        if ($was_default && !empty($filtered)) {
            $filtered[0]['is_default'] = true;
        }

        update_user_meta($user_id, 'aksrt_shop_addresses', array_values($filtered));

        return ['success' => true, 'error' => null];
    }

    /**
     * 设置默认地址
     *
     * @param int $user_id
     * @param int $address_id
     * @return array{success:bool, error:string|null}
     */
    public function set_default_address(int $user_id, int $address_id): array {
        $book = $this->get_user_address_book($user_id);
        $found = false;

        foreach ($book as &$item) {
            $item['is_default'] = ((int) ($item['id'] ?? 0) === $address_id);
            if ($item['is_default']) {
                $found = true;
            }
        }

        if (!$found) {
            return ['success' => false, 'error' => __('地址不存在。', 'aksrt')];
        }

        update_user_meta($user_id, 'aksrt_shop_addresses', $book);

        return ['success' => true, 'error' => null];
    }

    /**
     * 生成下一个地址 ID
     */
    private function next_address_id(array $book): int {
        $max = 0;
        foreach ($book as $item) {
            $max = max($max, (int) ($item['id'] ?? 0));
        }
        return $max + 1;
    }
}