<?php
/**
 * AKSRT User Home — 公开用户主页协调类
 *
 * 负责公开用户主页（/user/{nicename}/）的初始化和 tab 注册。
 *
 * @package AKSRT
 */

defined('ABSPATH') || exit;

class AKSRT_User_Home {

    private static $instance = null;

    /** @var array Tab 注册表 */
    private $tabs = [];

    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_tabs();
    }

    /**
     * 注册默认公开 Tab
     */
    private function register_default_tabs(): void {
        $this->tabs = [
            'posts' => [
                'label'    => __('文章', 'aksrt'),
                'icon'     => 'file-alt',
                'priority' => 10,
            ],
            'comments' => [
                'label'    => __('评论', 'aksrt'),
                'icon'     => 'comment',
                'priority' => 20,
            ],
            'favorites' => [
                'label'    => __('收藏', 'aksrt'),
                'icon'     => 'star',
                'priority' => 30,
            ],
            'credits' => [
                'label'    => class_exists('AKSRT_Settings')
                    ? sprintf(__('我的%s', 'aksrt'), AKSRT_Settings::get_currency_name())
                    : __('我的积分', 'aksrt'),
                'icon'     => 'wallet',
                'priority' => 40,
            ],
            'product' => [
                'label'    => __('商品', 'aksrt'),
                'icon'     => 'shopping-bag',
                'priority' => 50,
            ],
            'plate' => [
                'label'    => __('圈子', 'aksrt'),
                'icon'     => 'users',
                'priority' => 60,
            ],
            'forum' => [
                'label'    => __('论坛', 'aksrt'),
                'icon'     => 'comments',
                'priority' => 70,
            ],
            'follow' => [
                'label'    => __('关注', 'aksrt'),
                'icon'     => 'user-plus',
                'priority' => 80,
            ],
        ];

        /**
         * 允许插件/子主题注册额外公开 Tab
         *
         * @param array $tabs Tab 注册表
         */
        $this->tabs = apply_filters('aksrt_user_home_tabs', $this->tabs);
    }

    /**
     * 获取 Tab 注册表
     */
    public function get_tabs(): array {
        return $this->tabs;
    }

    /**
     * 获取当前用户主页实际可见的公开 Tab。
     */
    public function get_visible_tabs(bool $is_own_profile = false): array {
        $settings = class_exists('AKSRT_Settings')
            ? AKSRT_Settings::get_user_home_settings()
            : [
                'tabs' => ['posts', 'comments', 'favorites'],
            ];

        $visible = [];
        foreach ((array) ($settings['tabs'] ?? []) as $key) {
            if (!isset($this->tabs[$key])) {
                continue;
            }

            if ($key === 'credits' && (!$is_own_profile || !class_exists('AKSRT_Settings') || !AKSRT_Settings::credits_enabled())) {
                continue;
            }

            $visible[$key] = $this->tabs[$key];
        }

        if (empty($visible)) {
            foreach (['posts', 'comments', 'favorites'] as $fallback) {
                if (isset($this->tabs[$fallback])) {
                    $visible[$fallback] = $this->tabs[$fallback];
                }
            }
        }

        return $visible;
    }

    /**
     * 获取公开展示的身份信号（认证 / 等级 / 徽章）。
     *
     * @return array<int,array{label:string,icon:string,tone:string}>
     */
    public function get_profile_signals(int $user_id): array {
        if ($user_id <= 0 || !class_exists('AKSRT_Settings')) {
            return [];
        }

        $settings = AKSRT_Settings::get_user_identity_settings();
        $signals = [];

        if (!empty($settings['verify']['enabled']) && !empty($settings['verify']['public_display']) && $this->is_user_verified($user_id, $settings['verify'])) {
            $signals[] = [
                'label' => (string) $settings['verify']['badge_text'],
                'icon'  => 'check-circle',
                'tone'  => 'success',
            ];
        }

        if (!empty($settings['level']['enabled']) && !empty($settings['level']['public_display'])) {
            $level = $this->get_user_level($user_id, $settings['level']);
            if ($level > 0) {
                $signals[] = [
                    'label' => (string) $settings['level']['label_prefix'] . $level,
                    'icon'  => 'layer-group',
                    'tone'  => 'info',
                ];
            }
        }

        if (!empty($settings['badge']['enabled']) && !empty($settings['badge']['public_display'])) {
            $badge_map = [];
            foreach ((array) ($settings['badge']['dictionary'] ?? []) as $item) {
                if (!empty($item['slug'])) {
                    $badge_map[(string) $item['slug']] = $item;
                }
            }

            $assigned = get_user_meta($user_id, 'aksrt_user_badges', true);
            if (!is_array($assigned)) {
                $assigned = preg_split('/[\s,]+/', (string) $assigned, -1, PREG_SPLIT_NO_EMPTY);
            }

            $limit = max(1, (int) ($settings['badge']['limit'] ?? 3));
            foreach ((array) $assigned as $slug) {
                $slug = sanitize_key((string) $slug);
                if ($slug === '' || !isset($badge_map[$slug])) {
                    continue;
                }

                $signals[] = [
                    'label' => (string) $badge_map[$slug]['label'],
                    'icon'  => 'award',
                    'tone'  => (string) ($badge_map[$slug]['tone'] ?? 'neutral'),
                ];

                if (count($signals) >= $limit + 2) {
                    break;
                }
            }
        }

        return $signals;
    }

    /**
     * 获取公开治理提示。
     *
     * @return array{state:string,text:string}|array{}
     */
    public function get_profile_notice(int $user_id): array {
        if ($user_id <= 0 || !class_exists('AKSRT_Settings')) {
            return [];
        }

        $settings = AKSRT_Settings::get_user_identity_settings();
        if (empty($settings['report']['enabled']) || empty($settings['report']['public_notice'])) {
            return [];
        }

        $state = sanitize_key((string) get_user_meta($user_id, 'aksrt_user_ban_state', true));
        if (!in_array($state, ['muted', 'restricted', 'banned'], true)) {
            return [];
        }

        return [
            'state' => $state,
            'text'  => (string) $settings['report']['ban_notice_text'],
        ];
    }

    /**
     * 公开主页是否显示举报入口。
     */
    public function show_report_entry(): bool {
        if (!class_exists('AKSRT_Settings')) {
            return false;
        }

        $settings = AKSRT_Settings::get_user_identity_settings();
        return !empty($settings['report']['enabled']) && !empty($settings['report']['public_entry']);
    }

    /**
     * @param array{accept_email_verified:bool} $verify_settings
     */
    private function is_user_verified(int $user_id, array $verify_settings): bool {
        $manual = sanitize_key((string) get_user_meta($user_id, 'aksrt_user_verify_status', true));
        if ($manual === 'verified') {
            return true;
        }

        if (!empty($verify_settings['accept_email_verified']) && class_exists('AKSRT_Auth_Service')) {
            return AKSRT_Auth_Service::user_is_email_verified($user_id);
        }

        return false;
    }

    /**
     * @param array{source:string,thresholds:array<int,int>} $level_settings
     */
    private function get_user_level(int $user_id, array $level_settings): int {
        if (($level_settings['source'] ?? 'credits_balance') === 'manual_meta') {
            return max(0, (int) get_user_meta($user_id, 'aksrt_user_level', true));
        }

        $score = function_exists('aksrt_user_credits') ? (int) aksrt_user_credits($user_id) : 0;
        $level = 0;

        foreach ((array) ($level_settings['thresholds'] ?? []) as $candidate => $threshold) {
            if ($score >= (int) $threshold) {
                $level = (int) $candidate;
            }
        }

        return $level;
    }

    /**
     * 判断当前页面是否为公开用户主页
     */
    public static function is_page(): bool {
        return function_exists('aksrt_is_user_home_page') && aksrt_is_user_home_page();
    }
}