#!/bin/bash
# Author: Alexander Epstein https://github.com/alexanderepstein

currentVersion="1.11.1"
configuredClient=""
configuredPython=""
source ~/.bash_profile ## allows grabbing enviornment variable
apiKey=$TASTE_API_KEY
info="0" ## indicates if we want extra info
search="0" ## indivates that we want results on the item itself

## This function determines which http get tool the system has installed and returns an error if there isnt one
getConfiguredClient()
{
  if  command -v curl &>/dev/null ; then
    configuredClient="curl"
  elif command -v wget &>/dev/null ; then
    configuredClient="wget"
  elif command -v fetch &>/dev/null ; then
    configuredClient="fetch"
  else
    echo "Error: This tool reqires either curl, wget, or fetch to be installed."
    return 1
  fi
}

getConfiguredPython()
{
  if  command -v python2 &>/dev/null ; then
    configuredPython="python2"
  elif command -v python &>/dev/null ; then
    configuredPython="python"
  else
    echo "Error: This tool requires python 2 to be installed."
    return 1
  fi
}


python()
{
  case "$configuredPython" in
    python2) python2 "$@";;
    python) python "$@";;
  esac
}

## Allows to call the users configured client without if statements everywhere
httpGet()
{
  case "$configuredClient" in
    curl) curl -A curl -s "$@";;
    wget) wget -qO- "$@";;
    fetch) fetch -o "...";;
  esac
}


checkInternet()
{
  echo -e "GET http://google.com HTTP/1.0\n\n" | nc google.com 80 > /dev/null 2>&1 # query google with a get request
  if [ $? -eq 0 ]; then #check if the output is 0, if so no errors have occured and we have connected to google successfully
    return 0
  else
    echo "Error: no active internet connection" >&2 #sent to stderr
    return 1
  fi
}

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
  repositoryName="Bash-Snippets" #Name of repostiory to be updated ex. Sandman-Lite
  githubUserName="alexanderepstein" #username that hosts the repostiory ex. alexanderepstein
  nameOfInstallFile="install.sh" # change this if the installer file has a different name be sure to include file extension if there is one
  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 == "" ]];then
    echo "Error: update utility has not been configured correctly." >&2
    exit 1
  elif [[ $latestVersion == "" ]];then
    echo "Error: no active internet connection" >&2
    exit 1
  else
    if [[ "$latestVersion" != "$currentVersion" ]]; then
      echo "Version $latestVersion available"
      echo -n "Do you wish to update $repositoryName [Y/n]: "
      read -r answer
      if [[ "$answer" == "Y" || "$answer" == "y" ]] ;then
        cd  ~ || { echo 'Update Failed' ; exit 1 ; }
        if [[ -d  ~/$repositoryName ]]; then rm -r -f $repositoryName  ||  { echo "Permissions Error: try running the update as sudo"; exit 1; } ; fi
        git clone "https://github.com/$githubUserName/$repositoryName" || { echo "Couldn't download latest version" ; exit 1; }
        cd $repositoryName ||  { echo 'Update Failed' ; exit 1 ;}
        git checkout "v$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 $repositoryName ||  { echo "Permissions Error: update succesfull but cannot delete temp files located at ~/$repositoryName delete this directory with sudo"; exit 1; }
      else
        exit 1
      fi
    else
      echo "$repositoryName is already the latest version"
    fi
  fi

}

## This function gets 3 results similar to the item of interest
getSimilar()
{
  export PYTHONIOENCODING=utf8 #necessary for python in some cases
  media=$( echo "$@" | tr " " + )
  response=$(httpGet "https://tastedive.com/api/similar?q=$media&k=$apiKey&info=$info")
  ## Extrapolate the information by parsing the JSON
  nameOne=$(echo $response | python -c "import sys, json; print json.load(sys.stdin)['Similar']['Results'][0]['Name']" 2>  /dev/null || { echo "Error: Did you search a valid item?"; return 1; } )
  typeOne=$(echo $response | python -c "import sys, json; print json.load(sys.stdin)['Similar']['Results'][0]['Type']" 2>  /dev/null)
  nameTwo=$(echo $response | python -c "import sys, json; print json.load(sys.stdin)['Similar']['Results'][1]['Name']" 2>  /dev/null)
  typeTwo=$(echo $response | python -c "import sys, json; print json.load(sys.stdin)['Similar']['Results'][1]['Type']" 2>  /dev/null)
  nameThree=$(echo $response | python -c "import sys, json; print json.load(sys.stdin)['Similar']['Results'][2]['Name']" 2>  /dev/null)
  typeThree=$(echo $response | python -c "import sys, json; print json.load(sys.stdin)['Similar']['Results'][2]['Type']" 2>  /dev/null)
  if [[ $info == "1" ]];then ## if we want more detailed info we have to grab a few more fields
    wikiOne=$(echo $response | python -c "import sys, json; print json.load(sys.stdin)['Similar']['Results'][0]['wTeaser']" 2>  /dev/null)
    wikiTwo=$(echo $response | python -c "import sys, json; print json.load(sys.stdin)['Similar']['Results'][1]['wTeaser']" 2>  /dev/null)
    wikiThree=$(echo $response | python -c "import sys, json; print json.load(sys.stdin)['Similar']['Results'][2]['wTeaser']" 2>  /dev/null)
    youtube=$(echo $response | python -c "import sys, json; print json.load(sys.stdin)['Similar']['Results'][0]['yUrl']" 2>  /dev/null)
  fi
}

## This function grabs all the information it can on the item of interest itself
getInfo()
{
  export PYTHONIOENCODING=utf8 #necessary for python in some cases
  media=$( echo "$@" | tr " " + )
  response=$(httpGet "https://tastedive.com/api/similar?q=$media&k=$apiKey&info=$info")
  name=$(echo $response | python -c "import sys, json; print json.load(sys.stdin)['Similar']['Info'][0]['Name']")
  type=$(echo $response | python -c "import sys, json; print json.load(sys.stdin)['Similar']['Info'][0]['Type']")
  if [[ $info == "1" ]]; then
    wiki=$(echo $response | python -c "import sys, json; print json.load(sys.stdin)['Similar']['Info'][0]['wTeaser']")
    youtube=$(echo $response | python -c "import sys, json; print json.load(sys.stdin)['Similar']['Info'][0]['yUrl']")
  else
    wiki="None"
    youtube="None"
  fi
}

printResults()
{
  if [[ $info == "1" ]];then
    echo "==================================="
    echo
    echo $nameOne: $typeOne
    echo $wikiOne
    echo
    echo
    echo $nameTwo: $typeTwo
    echo $wikiTwo
    echo
    echo
    echo $nameThree: $typeThree
    echo $wikiThree
    echo
    if [[ $youtube != "None" ]];then echo $youtube;fi
    echo
    echo "==================================="
  else
    echo "==================================="
    echo $nameOne: $typeOne
    echo $nameTwo: $typeTwo
    echo $nameThree: $typeThree
    echo "==================================="
  fi
}

printInfo()
{
  echo "==================================="
  echo
  echo $name: $type
  echo $wiki
  echo
  if [[ $youtube != "None" ]];then echo $youtube;fi
  echo "==================================="
}


usage()
{
  echo "Taste"
  echo "Description: A recommendation engine that provides 3 similar items based on some input topic."
  echo "  Taste also has the ability to provide information on the item of interest."
  echo "  Supports: shows, books, music, artists, movies, authors, games"
  echo "Usage: taste [flag] [item]"
  echo "  -i Get more information on similar items"
  echo "  -s Get information on the item itself"
  echo "  -u Update Bash-Snippet Tools"
  echo "  -h Show the help"
  echo "  -v Get the tool version"
  echo "Examples:"
  echo "  taste -i Kendrick Lamar"
  echo "  taste Catcher in the Rye"
  echo "  taste -s Red Hot Chili Peppers"
}

if [[ $apiKey == "" ]];then
  echo "Error: API key not setup properly"
  echo "To get an API key visit https://tastedive.com/account/api_access"
  echo 'After getting the API key run the following command: export TASTE_API_KEY="yourAPIKeyGoesHere"'
  echo "After following all the steps and issues still persist try adding export TASTE_API_KEY manually to your .bash_profile"
  exit 1
fi
getConfiguredPython || exit 1
getConfiguredClient || exit 1
checkInternet || exit 1


while getopts "uvhis" opt; do
  case $opt in
    \?)
      echo "Invalid option: -$OPTARG" >&2
      exit 1
    ;;
    h)
      usage
      exit 0
    ;;
    v)
      echo "Version $currentVersion"
      exit 0
    ;;
    u)
      update
      exit 0
    ;;
    i)
      if [[ $search == "0" ]];then
        info="1"
      else
        echo "Error: the options -i and -s are mutually exclusive (-s already uses -i)"
        exit 1
      fi
    ;;
    s)
      if [[ $info != "1" ]];then
        search="1"
        info="1"
      else
        echo "Error: the options -i and -s are mutually exclusive (-s already uses -i)"
        exit 1
      fi
    ;;
    :)
      echo "Option -$OPTARG requires an argument." >&2
      exit 1
    ;;
  esac
done

if [[ $# == 0 ]]; then
  usage
elif [[ $1 == "update" ]];then
  update
elif [[ $1 == "help" ]];then
  usage
else
  if [[ $search == "0" ]];then
    if [[ $info == "0" ]];then
      getSimilar "$@" || exit 1 ## exit if we return 1 (chances are movie was not found)
      printResults
    else
      getSimilar "${@:2}" || exit 1
      printResults
    fi
  else
    getInfo "${@:2}" || exit 1 ## exit if we return 1 (chances are movie was not found)
    printInfo
  fi
fi