#!/bin/bash

function help() {

        echo "Usage: $0 [ DIR | files ]"
        echo "Options:"
        echo "    DIR - root directory where are subdirs for labs"
        echo "    files - files to be converted"
        echo "Examples:"
        echo "    $0 \"./CCNP/Configs for Trouble Tickets\""
        echo "    $0 ./Lab101-ALS1-TT-A-Cfg.txt Laby1-R3-TT-B-Cfg.txt"
}

# $1 ... path to original config file
# $2 ... original FastEthernet interface number (0/1, 1/1/1)
# $3 ... IOU Ethernet interface number
FastEthToEth() {
    if [ "$#" -ne 3 ]; then
        echo "Invalid args in FastEthToEth function call"
        exit 1
    fi

    oldiface=$(sed 's#/#\\/#' <<< $2)
    newiface=$(sed 's#/#\\/#' <<< $3)

    sed -i 's/FastEthernet'$oldiface'/Ethernet'$newiface'/g' "$1"
}

# $1 path to config file
# $2 interface number to delete from config
delete_FastEth() {


    iface=$(sed 's#/#\\/#' <<< $2)
    sed -i '/interface FastEthernet'$iface'/,/!/d' "$1"
}

# $1 path to config file
# $2 interface number to delete from config
delete_GigaEth() {

    iface=$(sed 's#/#\\/#' <<< $2)
    sed -i '/interface GigabitEthernet'$iface'/,/!/d' "$1"
}

# $1 ... path to original config file
parse_file() {


    dn=$(dirname "$1")

    # Create new dir in iou_configs
    if [ ! -d "./iou_configs/$dn" ]; then
        mkdir -p "./iou_configs/$dn"
    fi

    fn=$(basename "$1")
    # Copy original to iou_configs dir
    cp "$1" "./iou_configs/$dn/$fn"

    new_file_path="./iou_configs/$dn/$fn"

    # Mappings of Lab interfaces to IOU interfaces
    # TODO
    # 1. Delete unused FastEthernet && GigabitEthernet ifs
    # 2. Rename some of the FastEthernet to corresponding unused Ethernet ifs
    if [[ $1 == *"-DLS1-"* ]]; then
        FastEthToEth "$new_file_path" 0/1 0/1
        FastEthToEth "$new_file_path" 0/2 0/0
        FastEthToEth "$new_file_path" 0/3 0/3
        FastEthToEth "$new_file_path" 0/4 0/2
        FastEthToEth "$new_file_path" 0/5 1/0
        FastEthToEth "$new_file_path" 0/6 1/1
    elif [[ $1 == *"-DLS2-"* ]]; then
        FastEthToEth "$new_file_path" 0/1 0/1
        FastEthToEth "$new_file_path" 0/2 0/0
        FastEthToEth "$new_file_path" 0/3 0/3
        FastEthToEth "$new_file_path" 0/4 0/2
        FastEthToEth "$new_file_path" 0/5 1/0
        FastEthToEth "$new_file_path" 0/18 1/1
    elif [[ $1 == *"-ALS1-"* ]]; then
        delete_FastEth "$new_file_path" 0/5
        delete_FastEth "$new_file_path" 0/6
        delete_FastEth "$new_file_path" 0/7
        delete_FastEth "$new_file_path" 0/8
        delete_FastEth "$new_file_path" 0/9
        delete_FastEth "$new_file_path" 0/10
        delete_FastEth "$new_file_path" 0/11
        delete_FastEth "$new_file_path" 0/12
        delete_FastEth "$new_file_path" 0/13
        delete_FastEth "$new_file_path" 0/14
        delete_FastEth "$new_file_path" 0/15
        delete_FastEth "$new_file_path" 0/16
        delete_FastEth "$new_file_path" 0/17
        delete_FastEth "$new_file_path" 0/19
        delete_FastEth "$new_file_path" 0/20
        delete_FastEth "$new_file_path" 0/21
        delete_FastEth "$new_file_path" 0/22
        delete_FastEth "$new_file_path" 0/23
        delete_FastEth "$new_file_path" 0/24
        delete_GigaEth "$new_file_path" 0/1
        delete_GigaEth "$new_file_path" 0/2
        FastEthToEth   "$new_file_path" 0/1 0/1
        FastEthToEth   "$new_file_path" 0/2 0/0
        FastEthToEth   "$new_file_path" 0/3 0/3
        FastEthToEth   "$new_file_path" 0/4 0/2
        FastEthToEth   "$new_file_path" 0/18 1/1

    elif [[ $1 == *"-R1-"* ]]; then
        echo TODO
    elif [[ $1 == *"-R2-"* ]]; then
        echo TODO
    elif [[ $1 == *"-R3-"* ]]; then
        echo TODO
    else
        echo "Invalid path $1"
    fi
}

###### MAIN ######

# If no args supplied, print help and exit
if [ "$#" -eq 0 ]; then
    help
    exit 1
fi

# If not created already, create folder for storing result configs
if [ ! -d "./iou_configs" ]; then
    mkdir "./iou_configs"
fi

# If dir is supplied as arg, process it recursively
if [ -d "$1" ]; then
    echo
# If list of files is supplied as args, process them sequentialy
else
    for file in "$@"; do
        if [ -f "$file" ]; then
            parse_file "$file"
        fi
    done
fi