#!/bin/bash
# Author: Linyos Torovoltos github.com/linyostorovovoltos

setvar currentVersion = ""1.11.1""
setvar multiline = ""0"" # flag that indicates multiline option


proc getConfiguredClient {
  if command -v curl &> /dev/null  {
    setvar configuredClient = ""curl""
  } elif command -v wget &> /dev/null  {
    setvar configuredClient = ""wget""
  } else {
    echo "Error: This tool requires either curl or  wget to be installed." >&2
    return 1
  }
}

proc update {
  # Author: Alexander Epstein https://github.com/alexanderepstein
  # Update utility version 1.2.0
  # To test the tool enter in the defualt values that are in the examples for each variable
  setvar repositoryName = ""Bash-Snippets"" #Name of repostiory to be updated ex. Sandman-Lite
  setvar githubUserName = ""alexanderepstein"" #username that hosts the repostiory ex. alexanderepstein
  setvar nameOfInstallFile = ""install.sh"" # change this if the installer file has a different name be sure to include file extension if there is one
  setvar latestVersion = $(httpGet https://api.github.com/repos/$githubUserName/$repositoryName/tags | grep -Eo '"name":.*?[^\\]",'| head -1 | grep -Eo "[0-9.]+" ) #always grabs the tag without the v option

  if [[ $currentVersion == "" || $repositoryName == "" || $githubUserName == "" || $nameOfInstallFile == "" ]]{
    echo "Error: update utility has not been configured correctly." >&2
    exit 1
  } elif [[ $latestVersion == "" ]]{
    echo "Error: no active internet connection" >&2
    exit 1
  } else {
    if [[ "$latestVersion" != "$currentVersion" ]] {
      echo "Version $latestVersion available"
      echo -n "Do you wish to update $repositoryName [Y/n]: "
      read -r answer
      if [[ "$answer" == "Y" || "$answer" == "y" ]] {
        cd  ~ || do { echo 'Update Failed' ; exit 1 ; }
        if [[ -d  ~/$repositoryName ]] { rm -r -f $repositoryName  ||  do { echo "Permissions Error: try running the update as sudo"; exit 1; } ; }
        git clone "https://github.com/$githubUserName/$repositoryName" || do { echo "Couldn't download latest version" ; exit 1; }
        cd $repositoryName ||  do { echo 'Update Failed' ; exit 1 ;}
        git checkout "v$latestVersion" 2> /dev/null || git checkout $latestVersion 2> /dev/null || echo "Couldn't git checkout to stable release, updating to latest commit."
        chmod a+x install.sh #this might be necessary in your case but wasnt in mine.
        ./$nameOfInstallFile "update" || exit 1
        cd ..
        rm -r -f $repositoryName ||  do { echo "Permissions Error: update succesfull but cannot delete temp files located at ~/$repositoryName delete this directory with sudo"; exit 1; }
      } else {
        exit 1
      }
    } else {
      echo "$repositoryName is already the latest version"
    }
  }

}

proc httpGet {
  case (configuredClient) {
    curl { curl -A curl -s @ARGV}
    wget { wget -qO- @ARGV}
  }
}

proc makeqr {
  setvar input = $(echo $input | sed s/" "/%20/g ) ## replace all spaces in the sentence with HTML encoded space %20
  httpGet qrenco.de/$input ## get a response for the qrcode
}

proc makeMultiLineQr {
  if [[ $configuredClient != "curl" ]] { ## prevent usage without curl it is unreliable
    echo "Multiline currently only supports curl!"
    return 1
  } else {
    printf "%s" "$[join(ARGV)]"  | curl -F-='<'- qrenco.de
  }
}

proc checkInternet {
  echo -e "GET http://google.com HTTP/1.0\n\n" | nc google.com 80 > /dev/null 2>&1
  if test $? -eq 0 {
    return 0
  } else {
    echo "Error: no active internet connect" >&2
    return 1
  }
}

proc usage {
  echo "Qrify"
  echo "Usage: qrify [stringtoturnintoqrcode]"
  echo "Description: Converts strings or urls into a qr code."
  echo "    -u Update Bash-Snippet Tools"
	echo "    -m Enable multiline support (feature not working yet)"
  echo "    -h Show the help"
  echo "    -v Get the tool version"
  echo "Examples:"
  echo "    qrify this is a test string"
  echo "    qrify -m two\\\\nlines"
  echo "    qrify github.com # notice no http:// or https:// this will fail"

}

getConfiguredClient || exit 1
checkInternet || exit 1

while getopts m:hvu*: option
{
  case{
    v { echo "Version $currentVersion" && exit 0 }
    u { update && exit 0 || exit 1 }
    h { usage && exit 0 }
		m { setvar multiline = ""1"" && echo "Error this is not a supported feature yet" && exit 1 }
    * { usage && exit 0 }
  }
}

if [[ $# == "0" ]] {
  usage
  exit 0
} elif [[ $1 == "help" ]] {
  usage
  exit 0
} elif [[ $1 == "update" ]]{
  update || exit 1
  exit 0
} else {
  if [[ $multiline == "0" ]]{
    setvar input = $(printf '%s ' "$@")
    makeqr || exit 1
    exit 0
  } else {
    makeMultiLineQr ${@:2} || exit 1 ## if multiline that means a flag existed so start from the second argument
    exit 0
  }
}