<?php
/**
 * Settings credits/invite runtime helper.
 *
 * @package AKSRT
 */

defined('ABSPATH') || exit;

class AKSRT_Settings_Credits_Runtime {

    /**
     * 积分配置（合并默认值）。
     * @return array
     */
    public static function get_credit_settings(): array {
        $defaults = [
            'enabled'              => true,
            'currency_name'        => '',

            'register_bonus'       => 10,

            'daily_signin'         => [
                'enabled' => true,
                'base'    => 1,
                'streak'  => [
                    3  => 2,
                    7  => 5,
                    30 => 20,
                ],
            ],

            'comment_reward'       => [
                'enabled'     => true,
                'amount'      => 1,
                'daily_cap'   => 5,
                'min_length'  => 10,
                'on_approved' => true,
            ],

            'invite_reward'        => [
                'enabled'        => true,
                'inviter_amount' => 5,
                'invitee_amount' => 2,
                'require_verify' => true,
                'ip_daily_cap'   => 3,
                'register_field' => 'optional',
                'reject_invalid' => true,
            ],

            'download_default_cost' => 0,
        ];
        $saved = get_option('aksrt_credit_settings', []);
        if (!is_array($saved)) {
            $saved = [];
        }
        return array_replace_recursive($defaults, $saved);
    }

    /**
     * Normalized runtime settings for daily sign-in rewards.
     *
     * @return array{enabled:bool,base:int,streak:array<int,int>,currency_name:string}
     */
    public static function get_signin_reward_settings(): array {
        $config = self::get_credit_settings();
        $signin = is_array($config['daily_signin'] ?? null) ? $config['daily_signin'] : [];
        $streak = [];

        foreach ((array) ($signin['streak'] ?? []) as $day => $bonus) {
            $day = (int) $day;
            $bonus = (int) $bonus;
            if ($day <= 0 || $bonus < 0) {
                continue;
            }
            $streak[$day] = $bonus;
        }

        ksort($streak, SORT_NUMERIC);

        return [
            'enabled'       => !empty($config['enabled']) && !empty($signin['enabled']),
            'base'          => max(0, (int) ($signin['base'] ?? 0)),
            'streak'        => $streak,
            'currency_name' => self::get_currency_name(),
        ];
    }

    /**
     * Normalized runtime settings for invite rewards and registration gating.
     *
     * @return array{
     *   enabled:bool,
     *   inviter_amount:int,
     *   invitee_amount:int,
     *   require_verify:bool,
     *   ip_daily_cap:int,
     *   register_field:string,
     *   reject_invalid:bool,
     *   registration_enabled:bool
     * }
     */
    public static function get_invite_reward_settings(): array {
        $config = self::get_credit_settings();
        $invite = is_array($config['invite_reward'] ?? null) ? $config['invite_reward'] : [];
        $all = AKSRT_Settings::get_all();
        $register_field = (string) ($invite['register_field'] ?? 'optional');

        if (!in_array($register_field, ['hidden', 'optional', 'required'], true)) {
            $register_field = 'optional';
        }

        $inviter_amount = array_key_exists('invit_reward_points', $all)
            ? max(0, (int) $all['invit_reward_points'])
            : max(0, (int) ($invite['inviter_amount'] ?? 0));
        $invitee_enabled = array_key_exists('invit_invitee_reward', $all)
            ? !empty($all['invit_invitee_reward'])
            : max(0, (int) ($invite['invitee_amount'] ?? 0)) > 0;
        $invitee_amount = $invitee_enabled
            ? max(0, (int) ($invite['invitee_amount'] ?? $inviter_amount))
            : 0;

        return [
            'enabled'               => !empty($config['enabled']) && !empty($invite['enabled']),
            'inviter_amount'        => $inviter_amount,
            'invitee_amount'        => $invitee_amount,
            'require_verify'        => !empty($invite['require_verify']),
            'ip_daily_cap'          => max(0, (int) ($invite['ip_daily_cap'] ?? 0)),
            'register_field'        => $register_field,
            'reject_invalid'        => !empty($invite['reject_invalid']),
            'registration_enabled'  => self::invite_registration_enabled(),
            'invit_reward_points'   => $inviter_amount,
            'invit_reward_level'    => max(0, (int) ($all['invit_reward_level'] ?? 0)),
            'invit_reward_vip_days' => max(0, (int) ($all['invit_reward_vip_days'] ?? 0)),
            'invit_invitee_reward'  => $invitee_enabled,
        ];
    }

    /**
     * Canonical invite registration config derived from users.invite fields.
     *
     * @return array{
     *   enabled:bool,
     *   mode:string,
     *   register_field:string,
     *   reject_invalid:bool,
     *   code_length:int,
     *   open_desc:string,
     *   must_desc:string
     * }
     */
    public static function get_invite_registration_config(): array {
        $all = AKSRT_Settings::get_all();
        $credit_config = self::get_credit_settings();

        $enabled = array_key_exists('invit_code_s', $all)
            ? !empty($all['invit_code_s'])
            : (!isset($all['invite_registration_enabled']) || !empty($all['invite_registration_enabled']));

        $mode = isset($all['invit_code_mode']) ? (string) $all['invit_code_mode'] : '';
        if (!in_array($mode, ['open', 'must', 'close'], true)) {
            $legacy_mode = (string) ($credit_config['invite_reward']['register_field'] ?? 'optional');
            if ($legacy_mode === 'required') {
                $mode = 'must';
            } elseif ($legacy_mode === 'hidden') {
                $mode = 'close';
            } else {
                $mode = 'open';
            }
        }

        $register_field = 'optional';
        if (!$enabled || $mode === 'close') {
            $register_field = 'hidden';
        } elseif ($mode === 'must') {
            $register_field = 'required';
        }

        $open_desc = trim((string) ($all['invit_code_open_desc'] ?? ''));
        if ($open_desc === '') {
            $open_desc = __('邀请码为选填，没有邀请码也可以注册', 'aksrt');
        }

        $must_desc = trim((string) ($all['invit_code_must_desc'] ?? ''));
        if ($must_desc === '') {
            $must_desc = __('请输入邀请码', 'aksrt');
        }

        $code_length = isset($all['invit_code_length']) ? (int) $all['invit_code_length'] : 0;
        if ($code_length <= 0) {
            $code_length = (int) ($all['invite_code_length'] ?? 6);
        }
        $code_length = max(4, min(12, $code_length));

        return [
            'enabled'        => $enabled && $mode !== 'close',
            'mode'           => $mode,
            'register_field' => $register_field,
            'reject_invalid' => !empty($credit_config['invite_reward']['reject_invalid']),
            'code_length'    => $code_length,
            'open_desc'      => $open_desc,
            'must_desc'      => $must_desc,
        ];
    }

    /**
     * 积分功能是否启用。
     * 仅看积分系统开关；不再与 cms_features.download_credit 联合（该开关表示积分购买模式，非按次扣费）。
     */
    public static function credits_enabled(): bool {
        $config = self::get_credit_settings();
        return !empty($config['enabled']);
    }

    /**
     * 自定义货币名称，为空时回退"积分"。
     */
    public static function get_currency_name(): string {
        $config = self::get_credit_settings();
        $name = trim((string) ($config['currency_name'] ?? ''));
        return $name !== '' ? $name : __('积分', 'aksrt');
    }

    /**
     * 邀请系统是否启用（=积分系统启用 && invite_reward.enabled）。
     * 用于 UI 入口（个人中心邀请 Tab）的展示门禁。
     */
    public static function invite_enabled(): bool {
        $config = self::get_credit_settings();
        return !empty($config['enabled']) && !empty($config['invite_reward']['enabled']);
    }

    /**
     * 邀请注册功能总开关（独立于积分系统）。
     * 控制邀请链接、注册页邀请码字段、用户中心邀请卡片的显示。
     * 存储在 aksrt_settings（invit_code_s / invite_registration_enabled）。
     */
    public static function invite_registration_enabled(): bool {
        return !empty(self::get_invite_registration_config()['enabled']);
    }

    /**
     * 注册页邀请码字段模式：'hidden' | 'optional' | 'required'
     */
    public static function invite_register_field_mode(): string {
        $mode = (string) (self::get_invite_registration_config()['register_field'] ?? 'hidden');
        return in_array($mode, ['hidden', 'optional', 'required'], true) ? $mode : 'hidden';
    }

    /**
     * 必填模式下邀请码无效是否拒绝注册。
     */
    public static function invite_reject_invalid(): bool {
        return !empty(self::get_invite_registration_config()['reject_invalid']);
    }

    public static function invite_code_length(): int {
        return max(4, min(12, (int) (self::get_invite_registration_config()['code_length'] ?? 6)));
    }

    /**
     * 资源下载默认积分价（当资源未单独设价时回退使用）。
     */
    public static function download_default_cost(): int {
        $config = self::get_credit_settings();
        return max(0, (int) ($config['download_default_cost'] ?? 0));
    }
}