<?php

namespace app\api\logic\tcm;

use app\common\model\tcm\DailyFamilyLike;
use app\common\model\tcm\DailyShareInvite;
use app\common\model\tcm\Diagnosis;

/**
 * 家人点赞（邀请观看页 → 患者日常页展示）
 */
class DailyFamilyLikeLogic
{
    protected static string $error = '';

    /** @var string[] */
    protected static array $praisePool = [
        '坚持得很好，为您点赞！',
        '每天记录真棒，继续保持！',
        '您的自律让人佩服！',
        '加油，家人一直支持您！',
        '稳糖路上，您并不孤单！',
        '好习惯正在养成，真为您高兴！',
    ];

    public static function getError(): string
    {
        return self::$error;
    }

    protected static function setError(string $msg): bool
    {
        self::$error = $msg;
        return false;
    }

    /**
     * 校验当日邀请码
     *
     * @return array{diagnosis_id:int,invite_code:string}|false
     */
    protected static function resolveInvite(string $inviteCode): array|false
    {
        $inviteCode = strtoupper(trim($inviteCode));
        if ($inviteCode === '') {
            return self::setError('邀请码不能为空') ? false : false;
        }

        $row = DailyShareInvite::where('invite_code', $inviteCode)->find();
        if (!$row) {
            return self::setError('邀请码无效或已失效') ? false : false;
        }

        $today = date('Y-m-d');
        if ((string) $row['invite_date'] !== $today) {
            return self::setError('邀请码已过期，仅可在分享当天点赞') ? false : false;
        }

        return [
            'diagnosis_id' => (int) $row['diagnosis_id'],
            'invite_code'  => $inviteCode,
        ];
    }

    protected static function normalizeViewerKey(string $viewerKey): string
    {
        $viewerKey = preg_replace('/[^\w\-]/', '', trim($viewerKey)) ?? '';
        if (strlen($viewerKey) < 8) {
            return '';
        }
        return substr($viewerKey, 0, 64);
    }

    protected static function normalizeNickname(string $nickname): string
    {
        $nickname = trim($nickname);
        if ($nickname === '') {
            return '家人';
        }
        $nickname = mb_substr($nickname, 0, 8, 'UTF-8');
        return $nickname !== '' ? $nickname : '家人';
    }

    public static function countToday(int $diagnosisId, ?string $likeDate = null): int
    {
        $likeDate = $likeDate ?: date('Y-m-d');
        return (int) DailyFamilyLike::where('diagnosis_id', $diagnosisId)
            ->where('like_date', $likeDate)
            ->count();
    }

    public static function likedByViewer(int $diagnosisId, string $viewerKey, ?string $likeDate = null): bool
    {
        $viewerKey = self::normalizeViewerKey($viewerKey);
        if ($viewerKey === '') {
            return false;
        }
        $likeDate = $likeDate ?: date('Y-m-d');
        return DailyFamilyLike::where('diagnosis_id', $diagnosisId)
            ->where('like_date', $likeDate)
            ->where('viewer_key', $viewerKey)
            ->find() !== null;
    }

    /**
     * 邀请预览附加点赞信息
     */
    public static function metaForInvite(string $inviteCode, string $viewerKey = ''): array
    {
        $resolved = self::resolveInvite($inviteCode);
        if ($resolved === false) {
            return [
                'like_count'    => 0,
                'liked_by_me'   => false,
            ];
        }

        $diagnosisId = $resolved['diagnosis_id'];
        $viewerKey   = self::normalizeViewerKey($viewerKey);

        return [
            'like_count'  => self::countToday($diagnosisId),
            'liked_by_me' => $viewerKey !== '' && self::likedByViewer($diagnosisId, $viewerKey),
        ];
    }

    /**
     * 家人点赞（无需登录）
     */
    public static function addLike(string $inviteCode, string $viewerKey, string $nickname = ''): array|false
    {
        self::$error = '';
        $resolved = self::resolveInvite($inviteCode);
        if ($resolved === false) {
            return false;
        }

        $viewerKey = self::normalizeViewerKey($viewerKey);
        if ($viewerKey === '') {
            return self::setError('设备标识无效，请重试') ? false : false;
        }

        $diagnosisId = $resolved['diagnosis_id'];
        $likeDate    = date('Y-m-d');
        $nickname    = self::normalizeNickname($nickname);

        $exists = DailyFamilyLike::where('diagnosis_id', $diagnosisId)
            ->where('like_date', $likeDate)
            ->where('viewer_key', $viewerKey)
            ->find();

        if ($exists) {
            return [
                'already_liked'  => true,
                'like_count'     => self::countToday($diagnosisId, $likeDate),
                'praise_message' => '您今天已经点过赞啦，谢谢您的鼓励',
                'nickname'       => (string) ($exists['nickname'] ?? '家人'),
            ];
        }

        $todayCount = self::countToday($diagnosisId, $likeDate);
        if ($todayCount >= 50) {
            return self::setError('今日点赞已满，明天再来吧') ? false : false;
        }

        DailyFamilyLike::create([
            'diagnosis_id' => $diagnosisId,
            'like_date'    => $likeDate,
            'invite_code'  => $resolved['invite_code'],
            'viewer_key'   => $viewerKey,
            'nickname'     => $nickname,
            'create_time'  => time(),
        ]);

        $likeCount = self::countToday($diagnosisId, $likeDate);
        $idx       = $likeCount > 0 ? ($likeCount - 1) % count(self::$praisePool) : 0;

        return [
            'already_liked'  => false,
            'like_count'     => $likeCount,
            'praise_message' => self::$praisePool[$idx],
            'nickname'       => $nickname,
        ];
    }

    /**
     * 患者查看今日家人点赞（需登录且拥有诊单）
     */
    public static function summaryForPatient(int $userId, int $diagnosisId): array|false
    {
        self::$error = '';
        if ($userId <= 0) {
            return self::setError('请先登录') ? false : false;
        }
        if ($diagnosisId <= 0) {
            return self::setError('诊单ID不能为空') ? false : false;
        }

        $owned = \think\facade\Db::name('diagnosis_view_records')
            ->where('user_id', $userId)
            ->where('diagnosis_id', $diagnosisId)
            ->where('delete_time', null)
            ->find();
        if (!$owned) {
            return self::setError('无权查看该诊单') ? false : false;
        }

        $diagnosis = Diagnosis::where('id', $diagnosisId)->where('delete_time', null)->field('show_card')->find();
        if (!$diagnosis || (int) ($diagnosis['show_card'] ?? 1) !== 1) {
            return self::setError('该就诊卡已在统计端隐藏') ? false : false;
        }

        $likeDate = date('Y-m-d');
        $count    = self::countToday($diagnosisId, $likeDate);

        $rows = DailyFamilyLike::where('diagnosis_id', $diagnosisId)
            ->where('like_date', $likeDate)
            ->order('id', 'desc')
            ->limit(8)
            ->select()
            ->toArray();

        $recent = [];
        foreach ($rows as $r) {
            $recent[] = [
                'nickname' => (string) ($r['nickname'] ?? '家人'),
                'time_label' => self::timeLabel((int) ($r['create_time'] ?? 0)),
            ];
        }

        $summaryLine = $count > 0
            ? "今日有 {$count} 位家人为您点赞，继续加油！"
            : '分享战报给家人，邀请他们为您点赞鼓劲';

        return [
            'like_count'   => $count,
            'summary_line' => $summaryLine,
            'recent'       => $recent,
        ];
    }

    protected static function timeLabel(int $ts): string
    {
        if ($ts <= 0) {
            return '刚刚';
        }
        $diff = time() - $ts;
        if ($diff < 60) {
            return '刚刚';
        }
        if ($diff < 3600) {
            return (int) floor($diff / 60) . '分钟前';
        }
        return date('H:i', $ts);
    }
}