package models

import "database/sql"

type BoardPermission struct {
    UserID      int
    BoardID     int
    Permissions int64
}

func GetBoardPermission(db *sql.DB, userID, boardID int) (*BoardPermission, error) {
    query := "SELECT user_id, board_id, permissions FROM board_permissions WHERE user_id = ? AND board_id = ?"
    row := db.QueryRow(query, userID, boardID)
    bp := &BoardPermission{}
    err := row.Scan(&bp.UserID, &bp.BoardID, &bp.Permissions)
    if err == sql.ErrNoRows {
        return nil, nil
    }
    if err != nil {
        return nil, err
    }
    return bp, nil
}

func SetBoardPermission(db *sql.DB, bp BoardPermission) error {
    query := "INSERT INTO board_permissions (user_id, board_id, permissions) VALUES (?, ?, ?) ON DUPLICATE KEY UPDATE permissions = ?"
    _, err := db.Exec(query, bp.UserID, bp.BoardID, bp.Permissions, bp.Permissions)
    return err
}

const (
    PermPostInBoard   int64 = 1 << 0
    PermModerateBoard int64 = 1 << 1
    PermViewBoard     int64 = 1 << 2
)

func HasBoardPermission(db *sql.DB, userID, boardID int, perm int64) (bool, error) {
    bp, err := GetBoardPermission(db, userID, boardID)
    if err != nil {
        return false, err
    }
    if bp == nil {
        return false, nil
    }
    return bp.Permissions&perm != 0, nil
}