<?php

namespace App\Services;

use App\Models\Banner;
use App\Support\ContentLink;
use Illuminate\Support\Facades\DB;

class BannerVisibilityService
{
    /** Positive numeric links are activity IDs; empty/zero and other links are unbound. */
    public static function activityId($link): ?string
    {
        $link = trim((string) $link);
        if ($link === '' || !ctype_digit($link)) {
            return null;
        }

        $id = ltrim($link, '0');
        return $id === '' ? null : $id;
    }

    /** Only activity-type banners bind an activity; rows saved before click_type existed fall back to the link. */
    public static function boundActivityId(?string $clickType, $link): ?string
    {
        return $clickType === null || $clickType === 'activity' ? self::activityId($link) : null;
    }

    /** A stored click type wins; otherwise infer it from a legacy single `link` value. */
    public static function clickType(?string $clickType, $link): string
    {
        if (in_array($clickType, ['none', 'activity', 'external', 'internal'], true)) return $clickType;
        $link = trim((string) $link);
        if (self::activityId($link) !== null) return 'activity';
        if ($link === '' || ltrim($link, '0') === '') return 'none';
        return str_starts_with($link, '/') && !str_starts_with($link, '//') ? 'internal' : 'external';
    }

    /** Bound banners follow the activity; only unbound banners use the stored manual setting. */
    public static function decorate(iterable $banners, ?int $now = null): array
    {
        $now = $now ?? time();
        $items = [];
        $activityIds = [];
        foreach ($banners as $banner) {
            $item = $banner instanceof Banner ? $banner->toArray() : $banner;
            $item['status'] = (int) $item['status'];
            $item['activity_id'] = self::boundActivityId($item['click_type'] ?? null, $item['link'] ?? null);
            $item = array_replace($item, self::links($item));
            $item['can_manual_toggle'] = $item['activity_id'] === null;
            $item['manual_status'] = $item['can_manual_toggle'] ? $item['status'] : null;
            if ($item['activity_id'] !== null) {
                $activityIds[$item['activity_id']] = $item['activity_id'];
            }
            $items[] = $item;
        }

        // Read raw timestamps; ActivityReward's date accessors discard the time of day.
        $activities = empty($activityIds) ? collect() : DB::table('activity_rewards')
            ->whereIn('id', array_values($activityIds))
            ->get(['id', 'status', 'start_time', 'end_time'])->keyBy('id');

        foreach ($items as &$item) {
            $activity = $item['activity_id'] === null ? null : $activities->get($item['activity_id']);
            $reason = null;
            if ($item['activity_id'] !== null) {
                if ($activity === null) {
                    $reason = 'activity_missing';
                } elseif ((int) $activity->status !== 1) {
                    $reason = 'activity_offline';
                } elseif ((int) $activity->start_time > $now) {
                    $reason = 'activity_not_started';
                } elseif ((int) $activity->end_time <= $now) {
                    $reason = 'activity_ended';
                }
            } elseif ($item['manual_status'] !== 1) {
                $reason = 'manual';
            }
            $item['effective_status'] = $reason === null ? 1 : 0;
            $item['status'] = $item['effective_status'];
            $item['offline_reason'] = $reason;
        }
        unset($item);

        return $items;
    }

    /** Normalized jump fields for the admin form; internal rows always expose both platform paths. */
    public static function links(array $row): array
    {
        $type = self::clickType($row['click_type'] ?? null, $row['link'] ?? null);
        if ($type === 'activity') {
            return ['click_type' => $type, 'link' => self::activityId($row['link'] ?? null), 'link_pc' => null, 'link_h5' => null];
        }
        return ContentLink::normalize(['click_type' => $type] + $row);
    }
}