<?php
// +----------------------------------------------------------------------
// | 学员端知识库服务类
// +----------------------------------------------------------------------

namespace app\service\api\student;

use app\model\student\Student;
use think\facade\Db;
use core\base\BaseService;

/**
 * 学员知识库服务类
 */
class KnowledgeService extends BaseService
{
    /**
     * table_type 枚举值映射
     */
    private $tableTypeMap = [
        '1' => ['name' => '课程教学大纲', 'icon' => '📖'],
        '2' => ['name' => '跳绳教案库', 'icon' => '🏃'],
        '3' => ['name' => '增高教案库', 'icon' => '📏'],
        '4' => ['name' => '篮球教案库', 'icon' => '🏀'],
        '5' => ['name' => '强化教案库', 'icon' => '💪'],
        '6' => ['name' => '空中忍者教案库', 'icon' => '🥷'],
        '7' => ['name' => '少儿安防教案库', 'icon' => '🛡️'],
        '8' => ['name' => '体能教案库', 'icon' => '🏋️'],
        '9' => ['name' => '热身动作库', 'icon' => '🔥'],
        '10' => ['name' => '体能动作库', 'icon' => '💪'],
        '11' => ['name' => '趣味游戏库', 'icon' => '🎮'],
        '12' => ['name' => '放松动作库', 'icon' => '🧘'],
        '13' => ['name' => '训练内容', 'icon' => '📋'],
        '14' => ['name' => '训练视频', 'icon' => '📹'],
        '15' => ['name' => '课后作业', 'icon' => '📝'],
        '16' => ['name' => '优秀一堂课', 'icon' => '⭐'],
        '17' => ['name' => '空中忍者动作', 'icon' => '🥷'],
        '18' => ['name' => '篮球动作', 'icon' => '🏀'],
        '19' => ['name' => '跳绳动作', 'icon' => '🏃'],
        '20' => ['name' => '跑酷动作', 'icon' => '🏃‍♂️'],
        '21' => ['name' => '安防动作', 'icon' => '🛡️'],
        '22' => ['name' => '标准化动作', 'icon' => '✅'],
        '23' => ['name' => '3-6岁体测', 'icon' => '👶'],
        '24' => ['name' => '7+体测', 'icon' => '🧒'],
        '25' => ['name' => '3-6岁体测讲解—解读', 'icon' => '👶📊'],
        '26' => ['name' => '7+岁体测讲解—解读', 'icon' => '🧒📊'],
        '27' => ['name' => '互动游戏', 'icon' => '🎲'],
        '28' => ['name' => '套圈游戏', 'icon' => '⭕'],
        '29' => ['name' => '鼓励方式', 'icon' => '👏']
    ];
    private $typeArr = [
        'student'=>['13','14','15','27','28','29']
    ];
    /**
     * 获取知识文章列表
     * @param array $data
     * @return array
     */
    public function getKnowledgeList($data)
    {
        $studentId = $data['student_id'];
        $category = $data['category'] ?? '';
        $page = $data['page'] ?? 1;
        $limit = $data['limit'] ?? 10;
        $keyword = $data['keyword'] ?? '';

        // 构建查询条件
        $where = [];
        
        // 权限控制：检查学员是否有权限查看
        $where[] = ['', 'exp', Db::raw("FIND_IN_SET({$studentId}, student_ids)")];
        
        // 状态筛选：只查询启用状态的内容
        $where[] = ['status', '=', 1];
        
        // 软删除筛选：排除已删除的内容
        $where[] = ['delete_time', '=', '0'];
        
        // 分类筛选
        if (!empty($category)) {
            $where[] = ['table_type', '=', $category];
        }
        
        // 关键词搜索
        if (!empty($keyword)) {
            $where[] = ['title|content', 'like', "%{$keyword}%"];
        }

        // 查询总数
        $total = Db::table('school_lesson_course_teaching')
            ->where($where)
            ->count();

        // 分页查询文章列表
        $articles = Db::table('school_lesson_course_teaching')
            ->where($where)
            ->field('id,title,image,type,url,content,status,create_time,update_time,table_type,user_permission,exam_papers_id')
            ->order('create_time desc')
            ->limit(($page - 1) * $limit, $limit)
            ->select();

        $list = [];
        foreach ($articles as $article) {
            // 检查是否已读
            $isRead = $this->checkArticleRead($article['id'], $studentId);
            
            // 检查是否收藏
            $isFavorite = $this->checkArticleFavorite($article['id'], $studentId);
            
            // 获取分类名称
            $categoryInfo = $this->tableTypeMap[$article['table_type']] ?? ['name' => '其他', 'icon' => '📄'];
            
            $list[] = [
                'id' => $article['id'],
                'title' => $article['title'],
                'image' => $article['image'] ? get_image_url($article['image']) : '',
                'content' => strip_tags($article['content']),
                'table_type' => $article['table_type'],
                'category_name' => $categoryInfo['name'],
                'type' => $article['type'],
                'url' => $article['url'],
                'status' => $article['status'],
                'create_time' => $article['create_time'] ? strtotime($article['create_time']) : 0,
                'update_time' => $article['update_time'] ? strtotime($article['update_time']) : 0,
                'user_permission' => $article['user_permission'],
                'is_read' => $isRead,
                'is_favorite' => $isFavorite
            ];
        }

        return [
            'list' => $list,
            'current_page' => $page,
            'last_page' => ceil($total / $limit),
            'total' => $total,
            'per_page' => $limit
        ];
    }

    /**
     * 获取知识分类列表
     * @return array
     */
    public function getKnowledgeCategories($type)
    {
        $categories = [];
        
        // 获取有数据的分类统计
        $stats = Db::table('school_lesson_course_teaching')
            ->where('status', 1)
            ->where('delete_time', '0')
            ->group('table_type')
            ->field('table_type, count(*) as count')
            ->select();

        if ($type === 'student'){
            foreach ($stats as $stat) {
                $tableType = $stat['table_type'];
                if (in_array($tableType,$this->typeArr[$type])){
                    $categories[] = [
                        'value' => $tableType,
                        'text' => $this->tableTypeMap[$tableType]['name'],
                        'icon' => $this->tableTypeMap[$tableType]['icon'],
                        'count' => $stat['count']
                    ];
                }
            }
        }else{
            foreach ($stats as $stat) {
                $tableType = $stat['table_type'];
                if (isset($this->tableTypeMap[$tableType])){
                    $categories[] = [
                        'value' => $tableType,
                        'text' => $this->tableTypeMap[$tableType]['name'],
                        'icon' => $this->tableTypeMap[$tableType]['icon'],
                        'count' => $stat['count']
                    ];
                }
            }
        }


        return $categories;
    }

    /**
     * 获取推荐文章
     * @param array $data
     * @return array
     */
    public function getRecommendArticles($data)
    {
        $studentId = $data['student_id'];
        $limit = $data['limit'] ?? 5;

        // 构建查询条件
        $where = [];
        $where[] = ['', 'exp', Db::raw("FIND_IN_SET({$studentId}, student_ids)")];
        $where[] = ['status', '=', 1];
        $where[] = ['delete_time', '=', '0'];

        // 查询推荐文章（按创建时间倒序，取最新的）
        $articles = Db::table('school_lesson_course_teaching')
            ->where($where)
            ->field('id,title,image,content,create_time,table_type')
            ->order('create_time desc')
            ->limit($limit)
            ->select();

        $list = [];
        foreach ($articles as $article) {
            $categoryInfo = $this->tableTypeMap[$article['table_type']] ?? ['name' => '其他', 'icon' => '📄'];
            
            $list[] = [
                'id' => $article['id'],
                'title' => $article['title'],
                'image' => $article['image'] ? get_image_url($article['image']) : '',
                'summary' => mb_substr(strip_tags($article['content']), 0, 100, 'UTF-8'),
                'category_name' => $categoryInfo['name'],
                'create_time' => $article['create_time'] ? strtotime($article['create_time']) : 0,
                'read_count' => 0 // 这里可以后续添加阅读统计
            ];
        }

        return $list;
    }

    /**
     * 获取文章详情
     * @param array $data
     * @return array
     */
    public function getKnowledgeDetail($data)
    {
        $articleId = $data['id'];
        $studentId = $data['student_id'];

        // 权限验证
        $article = Db::table('school_lesson_course_teaching')
            ->where('id', $articleId)
            ->where('status', 1)
            ->where('delete_time', '0')
            ->where('', 'exp', Db::raw("FIND_IN_SET({$studentId}, student_ids)"))
            ->find();

        if (!$article) {
            throw new \Exception('文章不存在或无权限访问');
        }

        // 检查是否已读
        $isRead = $this->checkArticleRead($articleId, $studentId);
        
        // 检查是否收藏
        $isFavorite = $this->checkArticleFavorite($articleId, $studentId);
        
        // 获取分类名称
        $categoryInfo = $this->tableTypeMap[$article['table_type']] ?? ['name' => '其他', 'icon' => '📄'];

        return [
            'id' => $article['id'],
            'title' => $article['title'],
            'image' => $article['image'] ? get_image_url($article['image']) : '',
            'content' => $article['content'],
            'table_type' => $article['table_type'],
            'category_name' => $categoryInfo['name'],
            'type' => $article['type'],
            'url' => $article['url'],
            'status' => $article['status'],
            'create_time' => $article['create_time'] ? strtotime($article['create_time']) : 0,
            'update_time' => $article['update_time'] ? strtotime($article['update_time']) : 0,
            'user_permission' => $article['user_permission'],
            'exam_papers_id' => $article['exam_papers_id'],
            'is_read' => $isRead,
            'is_favorite' => $isFavorite
        ];
    }

    /**
     * 标记文章已读
     * @param array $data
     * @return array
     */
    public function markArticleRead($data)
    {
        $articleId = $data['article_id'];
        $studentId = $data['student_id'];

        // 检查文章是否存在且有权限
        $article = Db::table('school_lesson_course_teaching')
            ->where('id', $articleId)
            ->where('status', 1)
            ->where('delete_time', '0')
            ->where('', 'exp', Db::raw("FIND_IN_SET({$studentId}, student_ids)"))
            ->find();

        if (!$article) {
            throw new \Exception('文章不存在或无权限访问');
        }

        // 检查是否已经标记为已读
        $existRead = Db::table('school_student_article_reads')
            ->where('student_id', $studentId)
            ->where('article_id', $articleId)
            ->find();

        if ($existRead) {
            return ['message' => '已标记为已读'];
        }

        // 插入阅读记录
        Db::table('school_student_article_reads')->insert([
            'student_id' => $studentId,
            'article_id' => $articleId,
            'read_time' => date('Y-m-d H:i:s'),
            'read_duration' => 0
        ]);

        return ['message' => '标记已读成功'];
    }

    /**
     * 收藏/取消收藏文章
     * @param array $data
     * @return array
     */
    public function toggleArticleFavorite($data)
    {
        $articleId = $data['article_id'];
        $studentId = $data['student_id'];
        $action = $data['action'];

        // 检查文章是否存在且有权限
        $article = Db::table('school_lesson_course_teaching')
            ->where('id', $articleId)
            ->where('status', 1)
            ->where('delete_time', '0')
            ->where('', 'exp', Db::raw("FIND_IN_SET({$studentId}, student_ids)"))
            ->find();

        if (!$article) {
            throw new \Exception('文章不存在或无权限访问');
        }

        if ($action === 'add') {
            // 收藏
            $existFavorite = Db::table('school_student_favorites')
                ->where('student_id', $studentId)
                ->where('target_type', 'article')
                ->where('target_id', $articleId)
                ->find();

            if ($existFavorite) {
                return ['message' => '已收藏', 'is_favorite' => true];
            }

            Db::table('school_student_favorites')->insert([
                'student_id' => $studentId,
                'target_type' => 'article',
                'target_id' => $articleId,
                'created_at' => date('Y-m-d H:i:s')
            ]);

            return ['message' => '收藏成功', 'is_favorite' => true];
            
        } else {
            // 取消收藏
            Db::table('school_student_favorites')
                ->where('student_id', $studentId)
                ->where('target_type', 'article')
                ->where('target_id', $articleId)
                ->delete();

            return ['message' => '取消收藏成功', 'is_favorite' => false];
        }
    }

    /**
     * 获取知识库统计信息
     * @param int $studentId
     * @return array
     */
    public function getKnowledgeStats($studentId)
    {
        // 总文章数
        $totalArticles = Db::table('school_lesson_course_teaching')
            ->where('status', 1)
            ->where('delete_time', '0')
            ->where('', 'exp', Db::raw("FIND_IN_SET({$studentId}, student_ids)"))
            ->count();

        // 收藏数
        $favorites = Db::table('school_student_favorites')
            ->where('student_id', $studentId)
            ->where('target_type', 'article')
            ->count();

        // 已读文章数
        $readArticles = Db::table('school_student_article_reads')
            ->where('student_id', $studentId)
            ->count();

        // 分类统计
        $categoriesCount = [];
        $categoryStats = Db::table('school_lesson_course_teaching')
            ->where('status', 1)
            ->where('delete_time', '0')
            ->where('', 'exp', Db::raw("FIND_IN_SET({$studentId}, student_ids)"))
            ->group('table_type')
            ->field('table_type, count(*) as count')
            ->select();

        foreach ($categoryStats as $stat) {
            $categoriesCount[$stat['table_type']] = $stat['count'];
        }

        return [
            'total_articles' => $totalArticles,
            'favorites' => $favorites,
            'read_articles' => $readArticles,
            'categories_count' => $categoriesCount
        ];
    }

    /**
     * 搜索知识文章
     * @param array $data
     * @return array
     */
    public function searchKnowledgeArticles($data)
    {
        // 复用getKnowledgeList方法，已经包含了搜索功能
        return $this->getKnowledgeList($data);
    }

    /**
     * 检查文章是否已读
     * @param int $articleId
     * @param int $studentId
     * @return bool
     */
    private function checkArticleRead($articleId, $studentId)
    {
        $read = Db::table('school_student_article_reads')
            ->where('student_id', $studentId)
            ->where('article_id', $articleId)
            ->find();

        return !empty($read);
    }

    /**
     * 检查文章是否收藏
     * @param int $articleId
     * @param int $studentId
     * @return bool
     */
    private function checkArticleFavorite($articleId, $studentId)
    {
        $favorite = Db::table('school_student_favorites')
            ->where('student_id', $studentId)
            ->where('target_type', 'article')
            ->where('target_id', $articleId)
            ->find();

        return !empty($favorite);
    }
}