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| 1 | +package main |
| 2 | + |
| 3 | +import ( |
| 4 | + "time" |
| 5 | + "errors" |
| 6 | + "gorm.io/gorm" |
| 7 | + "gorm.io/driver/sqlite" |
| 8 | +) |
| 9 | + |
| 10 | +// User represents a user in the social media system |
| 11 | +type User struct { |
| 12 | + ID uint `gorm:"primaryKey"` |
| 13 | + Username string `gorm:"unique;not null"` |
| 14 | + Email string `gorm:"unique;not null"` |
| 15 | + Age int `gorm:"not null"` |
| 16 | + Country string `gorm:"not null"` |
| 17 | + CreatedAt time.Time |
| 18 | + Posts []Post `gorm:"foreignKey:UserID"` |
| 19 | + Likes []Like `gorm:"foreignKey:UserID"` |
| 20 | +} |
| 21 | + |
| 22 | +// Post represents a social media post |
| 23 | +type Post struct { |
| 24 | + ID uint `gorm:"primaryKey"` |
| 25 | + Title string `gorm:"not null"` |
| 26 | + Content string `gorm:"type:text"` |
| 27 | + UserID uint `gorm:"not null"` |
| 28 | + User User `gorm:"foreignKey:UserID"` |
| 29 | + Category string `gorm:"not null"` |
| 30 | + ViewCount int `gorm:"default:0"` |
| 31 | + IsPublished bool `gorm:"default:true"` |
| 32 | + CreatedAt time.Time |
| 33 | + UpdatedAt time.Time |
| 34 | + Likes []Like `gorm:"foreignKey:PostID"` |
| 35 | +} |
| 36 | + |
| 37 | +// Like represents a user's like on a post |
| 38 | +type Like struct { |
| 39 | + ID uint `gorm:"primaryKey"` |
| 40 | + UserID uint `gorm:"not null"` |
| 41 | + PostID uint `gorm:"not null"` |
| 42 | + User User `gorm:"foreignKey:UserID"` |
| 43 | + Post Post `gorm:"foreignKey:PostID"` |
| 44 | + CreatedAt time.Time |
| 45 | +} |
| 46 | + |
| 47 | +// ConnectDB establishes a connection to the SQLite database with auto-migration |
| 48 | +func ConnectDB() (*gorm.DB, error) { |
| 49 | + // TODO: Implement database connection with auto-migration |
| 50 | + db, err := gorm.Open(sqlite.Open("test.db"), &gorm.Config{}) |
| 51 | + if err != nil { |
| 52 | + return nil, err |
| 53 | + } |
| 54 | + err = db.AutoMigrate(&User{}, &Post{}, &Like{}) |
| 55 | + return db, err |
| 56 | +} |
| 57 | + |
| 58 | +// GetTopUsersByPostCount retrieves users with the most posts |
| 59 | +func GetTopUsersByPostCount(db *gorm.DB, limit int) ([]User, error) { |
| 60 | + // TODO: Implement top users by post count aggregation |
| 61 | + var users []User |
| 62 | + err := db.Joins("LEFT JOIN posts ON users.id = posts.user_id"). |
| 63 | + Group("users.id"). |
| 64 | + Order("COUNT(posts.id) DESC"). |
| 65 | + Limit(limit). |
| 66 | + Find(&users).Error |
| 67 | + return users, err |
| 68 | +} |
| 69 | + |
| 70 | +// GetPostsByCategoryWithUserInfo retrieves posts by category with pagination and user info |
| 71 | +func GetPostsByCategoryWithUserInfo(db *gorm.DB, category string, page, pageSize int) ([]Post, int64, error) { |
| 72 | + // TODO: Implement paginated posts retrieval with user info |
| 73 | + if page < 0 { |
| 74 | + return nil, 0, errors.New("Error") |
| 75 | + } |
| 76 | + var posts []Post |
| 77 | + var total int64 |
| 78 | + query := db.Where("category = ?", category) |
| 79 | + query.Model(&Post{}).Count(&total) |
| 80 | + offset := (page - 1) * pageSize |
| 81 | + err := query.Preload("User").Offset(offset).Limit(pageSize).Find(&posts).Error |
| 82 | + return posts, total, err |
| 83 | +} |
| 84 | + |
| 85 | +// GetUserEngagementStats calculates engagement statistics for a user |
| 86 | +func GetUserEngagementStats(db *gorm.DB, userID uint) (map[string]interface{}, error) { |
| 87 | + // TODO: Implement user engagement statistics |
| 88 | + stats := make(map[string]interface{}) |
| 89 | + var user User |
| 90 | + if err := db.First(&user, userID).Error; err != nil { |
| 91 | + return nil, err |
| 92 | + } |
| 93 | + var postCount int64 |
| 94 | + db.Model(&Post{}).Where("user_id = ?", userID).Count(&postCount) |
| 95 | + stats["total_posts"] = postCount |
| 96 | + |
| 97 | + var likesReceived int64 |
| 98 | + db.Model(&Like{}).Joins("JOIN posts ON likes.post_id = posts.id"). |
| 99 | + Where("posts.user_id = ?", userID).Count(&likesReceived) |
| 100 | + stats["total_likes_received"] = likesReceived |
| 101 | + |
| 102 | + var likesGiven int64 |
| 103 | + db.Model(&Like{}).Joins("JOIN users ON likes.user_id = users.id"). |
| 104 | + Where("users.id = ?", userID).Count(&likesGiven) |
| 105 | + stats["total_likes_given"] = likesGiven |
| 106 | + |
| 107 | + var avgViews float64 |
| 108 | + db.Model(&Post{}).Select("AVG(view_count)").Where("user_id = ?", userID).Scan(&avgViews) |
| 109 | + stats["average_views_per_post"] = avgViews |
| 110 | + |
| 111 | + return stats, nil |
| 112 | +} |
| 113 | + |
| 114 | +// GetPopularPostsByLikes retrieves popular posts by likes in a time period |
| 115 | +func GetPopularPostsByLikes(db *gorm.DB, days int, limit int) ([]Post, error) { |
| 116 | + // TODO: Implement popular posts by likes |
| 117 | + var posts []Post |
| 118 | + cutoffDate := time.Now().AddDate(0, 0, -days) |
| 119 | + err := db.Joins("LEFT JOIN likes ON posts.id = likes.post_id"). |
| 120 | + Where("posts.created_at >= ?", cutoffDate). |
| 121 | + Group("posts.id"). |
| 122 | + Order("COUNT(likes.id) DESC"). |
| 123 | + Limit(limit). |
| 124 | + Find(&posts).Error |
| 125 | + return posts, err |
| 126 | +} |
| 127 | + |
| 128 | +// GetCountryUserStats retrieves user statistics grouped by country |
| 129 | +func GetCountryUserStats(db *gorm.DB) ([]map[string]interface{}, error) { |
| 130 | + // TODO: Implement country-based user statistics |
| 131 | + var results []struct { |
| 132 | + Country string |
| 133 | + UserCount int64 |
| 134 | + AvgAge float64 |
| 135 | + } |
| 136 | + err := db.Model(&User{}). |
| 137 | + Select("country, COUNT(*) as user_count, AVG(age) as avg_age"). |
| 138 | + Group("country"). |
| 139 | + Scan(&results).Error |
| 140 | + var stats []map[string]interface{} |
| 141 | + for _, result := range results { |
| 142 | + stat := map[string]interface{}{ |
| 143 | + "country": result.Country, |
| 144 | + "user_count": result.UserCount, |
| 145 | + "avg_age": result.AvgAge, |
| 146 | + } |
| 147 | + stats = append(stats, stat) |
| 148 | + } |
| 149 | + return stats, err |
| 150 | +} |
| 151 | + |
| 152 | +// SearchPostsByContent searches posts by content using full-text search |
| 153 | +func SearchPostsByContent(db *gorm.DB, query string, limit int) ([]Post, error) { |
| 154 | + // TODO: Implement full-text search |
| 155 | + var posts []Post |
| 156 | + searchPattern := "%" + query + "%" |
| 157 | + err := db.Where("title LIKE ? OR content LIKE ?", searchPattern, searchPattern). |
| 158 | + Limit(limit). |
| 159 | + Find(&posts).Error |
| 160 | + return posts, err |
| 161 | +} |
| 162 | + |
| 163 | +// GetUserRecommendations retrieves user recommendations based on similar interests |
| 164 | +func GetUserRecommendations(db *gorm.DB, userID uint, limit int) ([]User, error) { |
| 165 | + // TODO: Implement user recommendations algorithm |
| 166 | + var users []User |
| 167 | + err := db.Where("id != ? AND id IN (?)", userID, |
| 168 | + db.Model(&Like{}). |
| 169 | + Select("DISTINCT likes.user_id"). |
| 170 | + Joins("JOIN posts ON likes.post_id = posts.id"). |
| 171 | + Joins("JOIN posts p2 ON p2.category = posts.category"). |
| 172 | + Joins("JOIN likes l2 ON l2.post_id = p2.id"). |
| 173 | + Where("l2.user_id = ?", userID)). |
| 174 | + Limit(limit). |
| 175 | + Find(&users).Error |
| 176 | + return users, err |
| 177 | +} |
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