#!/bin/bash

# Run SQL instructions in a database ($db_name by default)
#
# usage: ynh_mysql_db_shell [database] <<< "instructions"
# | arg: database=    - the database to connect to (by default, $db_name)
#
# examples:
#    ynh_mysql_db_shell $db_name <<< "UPDATE ...;"
#    ynh_mysql_db_shell < /path/to/file.sql
#
ynh_mysql_db_shell() {
    local database=${1:-$db_name}
    mysql -B $database
}

# Create a database and grant optionnaly privilegies to a user
#
# [internal] ... handled by the core / "database resource"
#
# 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() {
    local db=$1

    local sql="CREATE DATABASE ${db};"

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

    mysql -B <<< "$sql"
}

# Drop a database
#
# [internal] ... handled by the core / "database resource"
#
# If you intend to drop the database *and* the associated user,
# consider using ynh_mysql_remove_db instead.
#
# usage: ynh_mysql_drop_db db
# | arg: db - the database name to drop
#
ynh_mysql_drop_db() {
    mysql -B <<< "DROP DATABASE ${1};"
}

# Dump a database
#
# usage: ynh_mysql_dump_db database
# | arg: database   - the database name to dump (by default, $db_name)
# | ret: The mysqldump output
#
# example: ynh_mysql_dump_db "roundcube" > ./dump.sql
#
ynh_mysql_dump_db() {
    local database=${1:-$db_name}
    mysqldump --single-transaction --skip-dump-date --routines "$database"
}

# Create a user
#
# [internal] ... handled by the core / "database resource"
#
# 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() {
    mysql -B <<< "CREATE USER '${1}'@'localhost' IDENTIFIED BY '${2}';"
}

# Check if a mysql user exists
#
# [internal]
#
# usage: ynh_mysql_user_exists user
# | arg: user   - the user for which to check existence
# | ret: 0 if the user exists, 1 otherwise.
ynh_mysql_user_exists() {
    local user=$1
    [[ -n "$(mysql -B <<< "SELECT User from mysql.user WHERE User = '$user';")" ]]
}

# Check if a mysql database exists
#
# [internal]
#
# usage: ynh_mysql_database_exists database
# | arg: database    - the database for which to check existence
# | exit: Return 1 if the database doesn't exist, 0 otherwise
#
ynh_mysql_database_exists() {
    local database=$1
    mysqlshow | grep -q "^| $database "
}

# Drop a user
#
# [internal] ... handled by the core / "database resource"
#
# usage: ynh_mysql_drop_user user
# | arg: user - the user name to drop
#
ynh_mysql_drop_user() {
    mysql -B <<< "DROP USER '${1}'@'localhost';"
}