#!/bin/bash

#=================================================
# COMMON VARIABLES
#=================================================

# dependencies used by the app
pkg_dependencies="postgresql apt-transport-https redis-server"

#=================================================
# PERSONAL HELPERS
#=================================================

#=================================================
# EXPERIMENTAL HELPERS
#=================================================

#=================================================
# FUTURE OFFICIAL HELPERS
#=================================================

# Check the architecture
#
# example: architecture=$(ynh_detect_arch)
#
# usage: ynh_detect_arch
#
# Requires YunoHost version 2.2.4 or higher.

ynh_detect_arch(){
        local architecture
        if [ -n "$(uname -m | grep arm64)" ] || [ -n "$(uname -m | grep aarch64)" ]; then
                architecture="arm64"              
        elif [ -n "$(uname -m | grep 64)" ]; then
                architecture="amd64"
        elif [ -n "$(uname -m | grep 86)" ]; then
                architecture="386"
        elif [ -n "$(uname -m | grep armv7)" ]; then
                architecture="arm7"
        elif [ -n "$(uname -m | grep armv6)" ]; then
                architecture="arm6"
        elif [ -n "$(uname -m | grep armv5)" ]; then
                architecture="arm5"
        else
                architecture="unknown"
        fi
        echo $architecture
}

#=================================================
# REDIS HELPERS
#=================================================

# get the first available redis database
#
# usage: ynh_redis_get_free_db
# | returns: the database number to use
ynh_redis_get_free_db() {
    local result max db
    result="$(redis-cli INFO keyspace)"

    # get the num
    max=$(cat /etc/redis/redis.conf | grep ^databases | grep -Eow "[0-9]+")

    db=0
    # default Debian setting is 15 databases
    for i in $(seq 0 "$max")
    do
        if ! echo "$result" | grep -q "db$i"
        then
            db=$i
            break 1
        fi
        db=-1
    done

    test "$db" -eq -1 && ynh_die --message="No available Redis databases..."

    echo "$db"
}

# Create a master password and set up global settings
# Please always call this script in install and restore scripts
#
# usage: ynh_redis_remove_db database
# | arg: database - the database to erase
ynh_redis_remove_db() {
    local db=$1
    redis-cli -n "$db" flushall
}