#!/usr/bin/with-contenv bashio
# shellcheck shell=bash
# shellcheck disable=
set -e

if ! bashio::supervisor.ping 2> /dev/null; then
    bashio::log.blue "Disabled : please use another method"
    exit 0
fi

bashio::log.notice "This script is used to mount remote smb/cifs/nfs shares. Instructions here : https://github.com/alexbelgium/hassio-addons/wiki/Mounting-remote-shares-in-Addons"

####################
# DEFINE FUNCTIONS #
####################

test_mount() {

    # Set initial test
    MOUNTED=false
    ERROR_MOUNT=false

    # Exit if not mounted
    if ! mountpoint -q /mnt/"$diskname"; then
        return 0
    fi

    # Exit if can't write
    [[ -e "/mnt/$diskname/testaze" ]] && rm -r "/mnt/$diskname/testaze"
    # shellcheck disable=SC2015
    mkdir "/mnt/$diskname/testaze" && touch "/mnt/$diskname/testaze/testaze" && rm -r "/mnt/$diskname/testaze" || ERROR_MOUNT=true

    # Only CIFS has the noserverino fallback
    if [[ "$ERROR_MOUNT" == "true" && "$FSTYPE" == "cifs" ]]; then
        # Test write permissions
        if [[ "$MOUNTOPTIONS" == *"noserverino"* ]]; then
            bashio::log.fatal "Disk is mounted, however unable to write in the shared disk. Please check UID/GID for permissions, and if the share is rw"
        else
            MOUNTOPTIONS="$MOUNTOPTIONS,noserverino"
            echo "... testing with noserverino"
            mount_drive "$MOUNTOPTIONS"
            return 0
        fi
    fi

    # Set correctly mounted bit
    MOUNTED=true
    return 0

}

mount_drive() {

    # Define options
    MOUNTED=true
    MOUNTOPTIONS="$1"

    # Try mounting (type depends on detected FSTYPE)
    if [[ "$FSTYPE" == "cifs" ]]; then
        mount -t cifs -o "$MOUNTOPTIONS" "$disk" /mnt/"$diskname" 2> ERRORCODE || MOUNTED=false
    elif [[ "$FSTYPE" == "nfs" ]]; then
        mount -t nfs -o "$MOUNTOPTIONS" "$disk" /mnt/"$diskname" 2> ERRORCODE || MOUNTED=false
    fi

    # Test if successful
    if [[ "$MOUNTED" == "true" ]]; then
        # shellcheck disable=SC2015
        test_mount
    fi

}

####################
# MOUNT NETWORK SHARES #
####################

if bashio::config.has_value 'networkdisks'; then

    # Alert message that it is a new code
    if [[ "$(date +"%Y%m%d")" -lt "20240201" ]]; then
        bashio::log.warning "------------------------"
        bashio::log.warning "This is a new code, please report any issues on https://github.com/alexbelgium/hassio-addons"
        bashio::log.warning "------------------------"
    fi

    echo 'Mounting network share(s)...'

    ####################
    # Define variables #
    ####################

    # Set variables
    MOREDISKS=$(bashio::config 'networkdisks')
    USERNAME=$(bashio::config 'cifsusername')
    PASSWORD=$(bashio::config 'cifspassword')
    SMBVERS=""
    SECVERS=""
    CHARSET=",iocharset=utf8"

    # Clean data (keeps NFS entries intact)
    MOREDISKS=${MOREDISKS// \/\//,\/\/}
    MOREDISKS=${MOREDISKS//, /,}
    MOREDISKS=${MOREDISKS// /"\040"}

    # Is domain set (CIFS only)
    DOMAIN=""
    DOMAINCLIENT=""
    if bashio::config.has_value 'cifsdomain'; then
        echo "... using domain $(bashio::config 'cifsdomain')"
        DOMAIN=",domain=$(bashio::config 'cifsdomain')"
        DOMAINCLIENT="--workgroup=$(bashio::config 'cifsdomain')"
    fi

    # Is  UID/GID set (used for CIFS mount options)
    PUID=",uid=$(id -u)"
    PGID=",gid=$(id -g)"
    if bashio::config.has_value 'PUID' && bashio::config.has_value 'PGID'; then
        echo "... using PUID $(bashio::config 'PUID') and PGID $(bashio::config 'PGID')"
        PUID=",uid=$(bashio::config 'PUID')"
        PGID=",gid=$(bashio::config 'PGID')"
    fi

    ##################
    # Mounting disks #
    ##################

    # shellcheck disable=SC2086
    for disk in ${MOREDISKS//,/ }; do # Separate comma separated values

        # Clean name of network share
        # shellcheck disable=SC2116,SC2001
        disk=$(echo $disk | sed "s,/$,,") # Remove / at end of name
        disk="${disk//"\040"/ }"          # replace \040 with space

        # Detect filesystem type by pattern (CIFS: //ip/share ; NFS: ip:/export[/path] or nfs://ip:/export[/path])
        FSTYPE="cifs"
        if [[ "$disk" =~ ^nfs:// ]]; then
            FSTYPE="nfs"
            disk="${disk#nfs://}"
        elif [[ "$disk" =~ ^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+:/.+ ]]; then
            FSTYPE="nfs"
        fi

        # Determine server for reachability checks
        if [[ "$FSTYPE" == "cifs" ]]; then
            server="$(echo "$disk" | grep -E -o "[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+")"
        else
            server="${disk%%:*}"
        fi

        diskname="$disk"
        diskname="${diskname//\\//}" # replace \ with /
        diskname="${diskname##*/}"   # Get only last part of the name
        MOUNTED=false
        SMBVERS_FORCE=""
        SECVERS_FORCE=""

        # Start
        echo "... mounting ($FSTYPE) $disk"

        # Data validation
        if [[ "$FSTYPE" == "cifs" ]]; then
            if [[ ! "$disk" =~ ^.*+[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+[/]+.*+$ ]]; then
                bashio::log.fatal "...... the structure of your \"networkdisks\" option : \"$disk\" doesn't seem correct, please use a structure like //123.12.12.12/sharedfolder,//123.12.12.12/sharedfolder2. If you don't use it, you can simply remove the text, this will avoid this error message in the future."
                touch ERRORCODE
                continue
            fi
        else
            if [[ ! "$disk" =~ ^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+:/.+ ]]; then
                bashio::log.fatal "...... invalid NFS path \"$disk\". Use a structure like 123.12.12.12:/export/path"
                touch ERRORCODE
                continue
            fi
        fi

        # Prepare mount point
        mkdir -p /mnt/"$diskname"
        chown root:root /mnt/"$diskname"

        # Quickly try to mount with defaults
        if [[ "$FSTYPE" == "cifs" ]]; then
            mount_drive "rw,file_mode=0775,dir_mode=0775,username=${USERNAME},password=${PASSWORD},nobrl${SMBVERS}${SECVERS}${PUID}${PGID}${CHARSET}${DOMAIN}"
        elif [[ "$FSTYPE" == "nfs" ]]; then
            mount_drive "rw,nfsvers=4.2,proto=tcp,hard,timeo=600,retrans=2"
        fi

        # Deeper analysis if failed
        if [ "$MOUNTED" = false ]; then

            if [[ "$FSTYPE" == "cifs" ]]; then

                # Does server exist (SMB port 445)
                output="$(nmap -F $server -T5 -oG -)"
                if ! echo "$output" | grep 445/open &> /dev/null; then
                    if echo "$output" | grep /open &> /dev/null; then
                        bashio::log.fatal "...... $server is reachable but SMB port not opened, stopping script"
                        touch ERRORCODE
                        continue
                    else
                        bashio::log.fatal "...... fatal : $server not reachable, is it correct"
                        touch ERRORCODE
                        continue
                    fi
                else
                    echo "...... $server is confirmed reachable"
                fi

                # Are credentials correct
                OUTPUT="$(smbclient -t 2 -L "$disk" -U "$USERNAME"%"$PASSWORD" -c "exit" $DOMAINCLIENT 2>&1 || true)"
                if echo "$OUTPUT" | grep -q "LOGON_FAILURE"; then
                    bashio::log.fatal "...... incorrect Username, Password, or Domain! Script will stop."
                    touch ERRORCODE
                    # Should there be a workgroup
                    if ! smbclient -t 2 -L $disk -N $DOMAINCLIENT -c "exit" &> /dev/null; then
                        bashio::log.fatal "...... perhaps a workgroup must be specified"
                        touch ERRORCODE
                    fi
                    continue
                elif echo "$OUTPUT" | grep -q "tree connect failed" || echo "$OUTPUT" | grep -q "NT_STATUS_CONNECTION_DISCONNECTED"; then
                    echo "... using SMBv1"
                    bashio::log.warning "...... share reachable only with legacy SMBv1 (NT1) negotiation. Forcing SMBv1 options."
                    SMBVERS_FORCE=",vers=1.0"
                    SECVERS_FORCE=",sec=ntlm"
                elif ! echo "$OUTPUT" | grep -q "Disk"; then
                    echo "... testing path"
                    bashio::log.fatal "...... no shares found. Invalid or inaccessible SMB path?"
                else
                    echo "...... credentials are valid"
                fi

                # Extracting SMB versions and normalize output
                # shellcheck disable=SC2210,SC2094
                SMBVERS="$(nmap --script smb-protocols "$server" -p 445 2> 1 | awk '/  [0-9]/' | awk '{print $NF}' | cut -c -3 | sort -V | tail -n 1 || true)"
                # Avoid :
                SMBVERS="${SMBVERS/:/.}"
                # Manage output
                if [ -n "$SMBVERS" ]; then
                    case $SMBVERS in
                        "202" | "200" | "20")
                            SMBVERS="2.0"
                            ;;
                        21)
                            SMBVERS="2.1"
                            ;;
                        302)
                            SMBVERS="3.02"
                            ;;
                        311)
                            SMBVERS="3.1.1"
                            ;;
                        "3.1")
                            echo "SMB 3.1 detected, converting to 3.0"
                            SMBVERS="3.0"
                            ;;
                    esac
                    echo "...... SMB version detected : $SMBVERS"
                    SMBVERS=",vers=$SMBVERS"
                elif smbclient -t 2 -L "$server" -m NT1 -N $DOMAINCLIENT &> /dev/null; then
                    echo "...... SMB version : only SMBv1 is supported, this can lead to issues"
                    SECVERS=",sec=ntlm"
                    SMBVERS=",vers=1.0"
                else
                    echo "...... SMB version : couldn't detect, default used"
                    SMBVERS=""
                fi

                # Apply forced SMBv1 options when initial connection required NT1 fallback
                if [[ -n "$SMBVERS_FORCE" ]]; then
                    if [[ -z "$SMBVERS" ]]; then
                        SMBVERS="$SMBVERS_FORCE"
                    fi
                    if [[ -z "$SECVERS" ]]; then
                        SECVERS="$SECVERS_FORCE"
                    fi
                fi

                # Ensure the Samba client allows SMBv1 when those options are required
                if [[ "${SMBVERS}${SMBVERS_FORCE}" == *"vers=1.0"* ]]; then
                    if [[ -f /etc/samba/smb.conf ]]; then
                        bashio::log.warning "...... enabling SMBv1 support in Samba client configuration"
                        sed -i '/\[global\]/!b;n;/client min protocol = NT1/!a\
        client min protocol = NT1' /etc/samba/smb.conf
                    fi
                fi

                # Test with different security versions
                #######################################
                for SECVERS in "$SECVERS" ",sec=ntlmv2" ",sec=ntlmssp" ",sec=ntlmsspi" ",sec=krb5i" ",sec=krb5" ",sec=ntlm" ",sec=ntlmv2i"; do
                    if [ "$MOUNTED" = false ]; then
                        mount_drive "rw,file_mode=0775,dir_mode=0775,username=${USERNAME},password=${PASSWORD},nobrl${SMBVERS}${SECVERS}${PUID}${PGID}${CHARSET}${DOMAIN}"
                    fi
                done

            elif [[ "$FSTYPE" == "nfs" ]]; then
                # Add NFS-specific port check (2049) similar to SMB (445)
                output="$(nmap -F $server -T5 -oG -)"
                if ! echo "$output" | grep -E '(2049|111)/open' &> /dev/null; then
                    bashio::log.fatal "...... $server is reachable but NFS ports not open"
                    continue
                fi
                # NFS fallback attempts: try common versions until one works
                for NFVER in 4.2 4.1 4 3; do
                    if [ "$MOUNTED" = false ]; then
                        mount_drive "rw,nfsvers=${NFVER},proto=tcp"
                    fi
                done
            fi
        fi

        # Messages
        if [ "$MOUNTED" = true ]; then

            bashio::log.info "...... $disk successfully mounted to /mnt/$diskname with options ${MOUNTOPTIONS/$PASSWORD/XXXXXXXXXX}"
            # Remove errorcode
            if [ -f ERRORCODE ]; then
                rm ERRORCODE
            fi

            # Alert if smbv1
            if [[ "$FSTYPE" == "cifs" && "$MOUNTOPTIONS" == *"1.0"* ]]; then
                bashio::log.warning ""
                bashio::log.warning "Your smb system requires smbv1. This is an obsolete protocol. Please correct this to prevent issues."
                bashio::log.warning ""
            fi

        else
            # Mounting failed messages
            if [[ "$FSTYPE" == "cifs" ]]; then
                bashio::log.fatal "Error, unable to mount $disk to /mnt/$diskname with username $USERNAME, $PASSWORD. Please check your remote share path, username, password, domain, try putting 0 in UID and GID"
                bashio::log.fatal "Here is some debugging info :"
                smbclient -t 2 -L $disk -U "$USERNAME%$PASSWORD" -c "exit"
                SMBVERS=""
                SECVERS=""
                PUID=""
                PGID=""
                CHARSET=""
                mount_drive "rw,file_mode=0775,dir_mode=0775,username=${USERNAME},password=${PASSWORD},nobrl${SMBVERS}${SECVERS}${PUID}${PGID}${CHARSET}${DOMAIN}"
            elif [[ "$FSTYPE" == "nfs" ]]; then
                bashio::log.fatal "Error, unable to mount NFS share $disk to /mnt/$diskname. Please check the export path and that NFS server allows this client (and NFSv4)."
                # last-ditch try with very basic options
                mount_drive "rw"
            fi

            bashio::log.fatal "Error read : $(< ERRORCODE), addon will stop in 1 min"

            # clean folder
            umount "/mnt/$diskname" 2> /dev/null || true
            rmdir "/mnt/$diskname" || true

            # Stop addon
            bashio::addon.stop

        fi

    done

fi