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

namespace AKSRT\User;

defined('ABSPATH') || exit;

class Center {

    private static $instance = null;

    /** @var array 面板注册表 */
    private $panels = [];

    private function __construct() {}

    public static function get_instance(): self {
        if (null === self::$instance) {
            self::$instance = new self();
        }
        return self::$instance;
    }

    public function init(): void {
        $this->register_default_panels();
        add_action('rest_api_init', [$this, 'register_rest_routes']);
    }

    /**
     * Register user-center fragment routes.
     */
    public function register_rest_routes(): void {
        register_rest_route('aksrt/v1', '/user-center/panel/(?P<tab>[a-z0-9_-]+)', [
            'methods'             => \WP_REST_Server::READABLE,
            'callback'            => [$this, 'rest_panel'],
            'permission_callback' => static function (): bool {
                return is_user_logged_in();
            },
            'args'                => [
                'tab' => [
                    'required'          => true,
                    'sanitize_callback' => 'sanitize_key',
                    'validate_callback' => static function ($value): bool {
                        return preg_match('/^[a-z0-9_-]+$/', (string) $value) === 1;
                    },
                ],
            ],
        ]);
    }

    /**
     * Render a user-center panel or a revenue reward fragment.
     */
    public function rest_panel(\WP_REST_Request $request) {
        $tab = sanitize_key((string) $request->get_param('tab'));
        $tabs = $this->get_dashboard_tabs();
        if (!isset($tabs[$tab])) {
            return new \WP_Error('aksrt_user_center_panel', __('用户中心面板不存在', 'aksrt'), ['status' => 404]);
        }

        $user = wp_get_current_user();
        $context = function_exists('aksrt_get_user_center_render_context')
            ? aksrt_get_user_center_render_context($user)
            : [];
        if (!is_array($context) || !$context) {
            return new \WP_Error('aksrt_user_center_context', __('用户中心数据加载失败', 'aksrt'), ['status' => 500]);
        }

        $income_request = [];
        if ($tab === 'creator') {
            $currency = sanitize_key((string) $request->get_param('income_currency'));
            $status = sanitize_key((string) $request->get_param('income_status'));
            $income_request = [
                'currency' => in_array($currency, ['', 'CNY', 'points'], true) ? $currency : '',
                'status'   => in_array($status, ['', 'pending', 'settled', 'cancelled', 'reversed', 'pending_recovery'], true) ? $status : '',
                'page'     => max(1, min(100, (int) $request->get_param('income_page'))),
            ];
            $context['creator_income_request'] = $income_request;
        }
        $revenue_request = [];
        if ($tab === 'revenue') {
            $reward_tab = sanitize_key((string) $request->get_param('reward_tab'));
            if (!in_array($reward_tab, ['detail', 'orders', 'users'], true)) {
                $reward_tab = 'detail';
            }
            $revenue_request = [
                'reward_tab'      => $reward_tab,
                'commission_page' => max(1, min(100, (int) $request->get_param('commission_page'))),
                'invite_page'     => max(1, min(100, (int) $request->get_param('invite_page'))),
            ];
            $context['revenue_request'] = $revenue_request;
        }

        $html = function_exists('aksrt_capture_user_center_panel')
            ? aksrt_capture_user_center_panel($tab, $tabs[$tab], $context)
            : '';
        if ($html === '') {
            return new \WP_Error('aksrt_user_center_panel_empty', __('用户中心面板暂不可用', 'aksrt'), ['status' => 500]);
        }

        return rest_ensure_response([
            'success' => true,
            'data'    => [
                'tab'           => $tab,
                'html'          => $html,
                'reward_tab'    => $revenue_request['reward_tab'] ?? '',
                'creator_income' => $income_request,
                'commission_page' => $revenue_request['commission_page'] ?? 1,
                'invite_page'   => $revenue_request['invite_page'] ?? 1,
            ],
        ]);
    }

    /**
     * 注册默认面板
     */
    private function register_default_panels(): void {
        $settings = class_exists('\AKSRT\Settings\Settings')
            ? \AKSRT\Settings\Settings::get_user_center_settings()
            : [
                'tabs'          => ['profile', 'posts', 'comments', 'favorites'],
                'avatar_upload' => true,
                'cover_upload'  => true,
                'social_links'  => true,
            ];

        $definitions = [
            'profile' => [
                'label'    => __('个人信息', 'aksrt'),
                'icon'     => 'user',
                'priority' => 10,
                'type'     => 'panel',
            ],
            'level' => [
                'label'    => __('我的等级', 'aksrt'),
                'icon'     => 'chart-line',
                'priority' => 15,
                'type'     => 'panel',
            ],
            'posts' => [
                'label'    => __('我的文章', 'aksrt'),
                'icon'     => 'file-alt',
                'priority' => 20,
                'type'     => 'panel',
            ],
            'creator' => [
                'label'    => __('创作中心', 'aksrt'),
                'icon'     => 'feather-alt',
                'priority' => 18,
                'type'     => 'panel',
            ],
            'comments' => [
                'label'    => __('我的评论', 'aksrt'),
                'icon'     => 'comment',
                'priority' => 30,
                'type'     => 'panel',
            ],
            'favorites' => [
                'label'    => __('我的收藏', 'aksrt'),
                'icon'     => 'star',
                'priority' => 40,
                'type'     => 'panel',
            ],
            'vip' => [
                'label'    => __('我的会员', 'aksrt'),
                'icon'     => 'crown',
                'priority' => 45,
                'type'     => 'panel',
            ],
            'orders' => [
                'label'    => __('我的订单', 'aksrt'),
                'icon'     => 'receipt',
                'priority' => 48,
                'type'     => 'panel',
            ],
            'credits' => [
                'label'    => class_exists('\AKSRT\Settings\Settings')
                    ? sprintf(__('我的%s', 'aksrt'), \AKSRT\Settings\Settings::get_currency_name())
                    : __('我的积分', 'aksrt'),
                'icon'     => 'wallet',
                'priority' => 50,
                'type'     => 'panel',
            ],
            'revenue' => [
                'label'    => __('收益中心', 'aksrt'),
                'icon'     => 'chart-line',
                'priority' => 55,
                'type'     => 'panel',
            ],
            'notif' => [
                'label'    => __('消息通知', 'aksrt'),
                'icon'     => 'bell',
                'priority' => 60,
                'type'     => 'link',
            ],
            'auth' => [
                'label'    => __('官方认证', 'aksrt'),
                'icon'     => 'id-badge',
                'priority' => 65,
                'type'     => 'panel',
            ],
            'settings' => [
                'label'    => __('账号设置', 'aksrt'),
                'icon'     => 'cog',
                'priority' => 70,
                'type'     => 'panel',
            ],
        ];

        $this->panels = [];
        $configured = array_values(array_filter(array_map('sanitize_key', (array) ($settings['tabs'] ?? []))));
        if ($configured === []) {
            $configured = ['profile', 'posts', 'comments', 'favorites'];
        }

        $level_on = class_exists('\AKSRT\User\Level')
            && !empty(\AKSRT\User\Level::settings()['enabled']);
        $credits_on = class_exists('\AKSRT\Settings\Settings') && \AKSRT\Settings\Settings::credits_enabled();
        $balance_on = class_exists('\AKSRT\Credits\Balance') && \AKSRT\Credits\Balance::enabled();
        $revenue_tab_on = class_exists('\AKSRT\Settings\Settings')
            && !empty(\AKSRT\Settings\Settings::get_payment_affiliate_settings()['enabled'])
            && \AKSRT\Settings\Settings::invite_registration_enabled();
        $creator_tab_on = class_exists('\AKSRT\Settings\Settings')
            && !empty(\AKSRT\Settings\Settings::get_payment_revenue_settings()['enabled']);
        $vip_on = class_exists('\AKSRT\Settings\Settings')
            && !empty(\AKSRT\Settings\Settings::get_payment_vip_settings()['enabled']);

        // Follow configured order; always auto-include enabled surfaces.
        $order = $configured;

        // Creator center is a dedicated workspace, separate from the posts archive.
        if ($creator_tab_on && !in_array('creator', $order, true)) {
            $insert_at = array_search('profile', $order, true);
            array_splice($order, $insert_at === false ? 0 : (int) $insert_at + 1, 0, ['creator']);
        }
        if (!$creator_tab_on) {
            $order = array_values(array_filter($order, static fn(string $key): bool => $key !== 'creator'));
        }

        // Growth level is a dedicated user-center surface, separate from spendable points.
        if ($level_on && !in_array('level', $order, true)) {
            $insert_at = array_search('profile', $order, true);
            array_splice($order, $insert_at === false ? 0 : (int) $insert_at + 1, 0, ['level']);
        }
        if (!$level_on) {
            $order = array_values(array_filter($order, static fn(string $key): bool => $key !== 'level'));
        }

        if ($vip_on && !in_array('vip', $order, true)) {
            $insert_at = count($order);
            foreach (['credits', 'favorites', 'posts'] as $anchor) {
                $idx = array_search($anchor, $order, true);
                if ($idx !== false) {
                    $insert_at = (int) $idx + 1;
                    break;
                }
            }
            array_splice($order, $insert_at, 0, ['vip']);
        }
        // Orders panel: always available when payment stack exists (UserOrders or Order).
        $orders_on = class_exists('\AKSRT\Payment\UserOrders')
            || class_exists('\AKSRT\Payment\Order');
        if ($orders_on && !in_array('orders', $order, true)) {
            $insert_at = count($order);
            foreach (['vip', 'credits', 'favorites'] as $anchor) {
                $idx = array_search($anchor, $order, true);
                if ($idx !== false) {
                    $insert_at = (int) $idx + ($anchor === 'vip' ? 1 : 0);
                    if ($anchor !== 'vip') {
                        $insert_at = (int) $idx + 1;
                    }
                    break;
                }
            }
            array_splice($order, $insert_at, 0, ['orders']);
        }
        if (($credits_on || $balance_on) && !in_array('credits', $order, true)) {
            $order[] = 'credits';
        }

        if ($revenue_tab_on && !in_array('revenue', $order, true)) {
            $insert_at = count($order);
            foreach (['credits', 'favorites', 'posts'] as $anchor) {
                $idx = array_search($anchor, $order, true);
                if ($idx !== false) {
                    $insert_at = (int) $idx + 1;
                    break;
                }
            }
            array_splice($order, $insert_at, 0, ['revenue']);
        }
        $auth_on = class_exists('\AKSRT\User\AuthApply')
            && !empty(\AKSRT\User\AuthApply::settings()['enabled']);
        if ($auth_on && !in_array('auth', $order, true)) {
            $order[] = 'auth';
        }
        if (!in_array('settings', $order, true)) {
            $order[] = 'settings';
        }

        foreach ($order as $key) {
            if (!isset($definitions[$key])) {
                continue;
            }
            if ($key === 'level' && !$level_on) {
                continue;
            }
            if ($key === 'credits' && !$credits_on && !$balance_on) {
                continue;
            }
            if ($key === 'revenue' && !$revenue_tab_on) {
                continue;
            }

            if ($key === 'vip' && !$vip_on) {
                continue;
            }
            if ($key === 'orders' && !$orders_on) {
                continue;
            }
            if ($key === 'auth' && !$auth_on) {
                continue;
            }
            $panel = $definitions[$key];
            if ($key === 'credits' && $balance_on) {
                $panel['label'] = __('我的资产', 'aksrt');
                $panel['icon']  = 'wallet';
            }
            $this->panels[$key] = $panel;
        }

        // Notif is a link entry (messages page), not a dashboard panel body.
        $this->panels['notif'] = $definitions['notif'];

        // Keep stable order by priority.
        uasort($this->panels, static function (array $a, array $b): int {
            return ((int) ($a['priority'] ?? 100)) <=> ((int) ($b['priority'] ?? 100));
        });

        /**
         * 允许插件/子主题注册额外面板
         *
         * @param array $panels 面板注册表
         */
        $this->panels = apply_filters('aksrt_user_center_panels', $this->panels);
    }

    /**
     * 获取面板注册表
     */
    public function get_panels(): array {
        return $this->panels;
    }

    /**
     * 获取可切换的本地面板（不含外链入口）。
     */
    public function get_dashboard_tabs(): array {
        return array_filter($this->panels, static function (array $panel): bool {
            return ($panel['type'] ?? 'panel') === 'panel';
        });
    }

    /**
     * 判断当前页面是否为本人中心
     */
    public static function is_page(): bool {
        return function_exists('aksrt_is_user_center_page') && aksrt_is_user_center_page();
    }
}