MYSQL_ROOT_PWD_FILE=/etc/yunohost/mysql

# Open a connection as a user
#
# example: ynh_mysql_connect_as 'user' 'pass' <<< "UPDATE ...;"
# example: ynh_mysql_connect_as 'user' 'pass' < /path/to/file.sql
#
# usage: ynh_mysql_connect_as user pwd [db]
# | arg: user - the user name to connect as
# | arg: pwd - the user password
# | arg: db - the database to connect to
ynh_mysql_connect_as() {
    mysql -u "$1" --password="$2" -B "${3:-}"
}

# Execute a command as root user
#
# usage: ynh_mysql_execute_as_root sql [db]
# | arg: sql - the SQL command to execute
# | arg: db - the database to connect to
ynh_mysql_execute_as_root() {
    ynh_mysql_connect_as "root" "$(sudo cat $MYSQL_ROOT_PWD_FILE)" \
        "${2:-}" <<< "$1"
}

# Execute a command from a file as root user
#
# usage: ynh_mysql_execute_file_as_root file [db]
# | arg: file - the file containing SQL commands
# | arg: db - the database to connect to
ynh_mysql_execute_file_as_root() {
    ynh_mysql_connect_as "root" "$(sudo cat $MYSQL_ROOT_PWD_FILE)" \
        "${2:-}" < "$1"
}

# Create a database and grant optionnaly privilegies to a user
#
# usage: ynh_mysql_create_db db [user [pwd]]
# | arg: db - the database name to create
# | arg: user - the user to grant privilegies
# | arg: pwd - the password to identify user by
ynh_mysql_create_db() {
    db=$1

    sql="CREATE DATABASE ${db};"

    # grant all privilegies to user
    if [[ $# -gt 1 ]]; then
        sql+=" GRANT ALL PRIVILEGES ON ${db}.* TO '${2}'@'localhost'"
        [[ -n ${3:-} ]] && sql+=" IDENTIFIED BY '${3}'"
        sql+=" WITH GRANT OPTION;"
    fi

    ynh_mysql_execute_as_root "$sql"
}

# Drop a database
#
# usage: ynh_mysql_drop_db db
# | arg: db - the database name to drop
ynh_mysql_drop_db() {
    ynh_mysql_execute_as_root "DROP DATABASE ${1};"
}

# Dump a database
#
# example: ynh_mysql_dump_db 'roundcube' > ./dump.sql
#
# usage: ynh_mysql_dump_db db
# | arg: db - the database name to dump
# | ret: the mysqldump output
ynh_mysql_dump_db() {
    mysqldump -u "root" -p"$(sudo cat $MYSQL_ROOT_PWD_FILE)" "$1"
}

# Create a user
#
# usage: ynh_mysql_create_user user pwd [host]
# | arg: user - the user name to create
# | arg: pwd - the password to identify user by
ynh_mysql_create_user() {
    ynh_mysql_execute_as_root \
        "CREATE USER '${1}'@'localhost' IDENTIFIED BY '${2}';"
}

# Drop a user
#
# usage: ynh_mysql_drop_user user
# | arg: user - the user name to drop
ynh_mysql_drop_user() {
    ynh_mysql_execute_as_root "DROP USER '${1}'@'localhost';"
}