#!/bin/bash

# Error handling
set -e

# For styling/colorizing output
txtbld=$(tput bold)
txtblue=${txtbld}$(tput setaf 4)
txtgreen=${txtbld}$(tput setaf 2)
txtred=${txtbld}$(tput setaf 1)
txtyellow=${txtbld}$(tput setaf 3)
txtwhite=${txtbld}$(tput setaf 7)


# To be implemented:
# dependencies=("echo" "sed" "tar" "zip" "bzip2" "gzip" "gunzip" "pax" "7z" "ar" "cpio" "brotli" "lzip" "rzip" "xz" "zstd")

#Use for loop to check if recognized file formats have been passed to first argument

# Main Dependency check
dependencies=("echo" "sed" "tput")
numdependencies=3
missingdependencies=0
for ((i = 0; i < numdependencies; i++)) ;
do
    if ! command -v "${dependencies[$i]}" &> /dev/null
    then
        echo "${txtred}dependency not met: ${dependencies[$i]}${txtwhite}"
        missingdependencies=$((missingdependencies+1))
    fi
done

# Intro Prompt
echo "${txtgreen}xpress: a simple shell script for compressing common file formats"

# Reset output style
tput bold & tput setaf 7

# grabs the extension string
extension=$(echo "${1}" | sed 's/^[^\..:]*[\..]//')

# grabs the filename/directoryname string
fdname=$(echo "${1}" | sed 's/\..*$//')

# Simply copy and paste, changing extension string and extraction method below
if [ "${extension}" == "tgz" ] ; then
    # Dependency check
    dependencies=("echo" "tar" "gzip")
    numdependencies=3
    missingdependencies=0
    for ((i = 0; i < numdependencies; i++)) ;
    do
        if ! command -v "${dependencies[$i]}" &> /dev/null
        then
            echo "${txtred}dependency not met: ${dependencies[$i]}${txtwhite}"
            missingdependencies=$((missingdependencies+1))
        fi
    done

    if [ $missingdependencies -gt 0 ] ; then
        echo "${txtred}Please install needed dependencies${txtwhite}"
        exit 1
    fi

    echo "${txtblue}compressing .tgz...${txtyellow}"
    # main extraction method
    tar -cvzf "${1}" "${fdname}" &> /dev/null
    echo ".tgz compression finished!${txtwhite}"
fi