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

setglobal currentVersion = '"1.11.1'" #This version variable should not have a v but should contain all other characters ex Github release tag is v1.2.4 currentVersion is 1.2.4
setglobal LANG = $(LANG:-en)
setglobal locale = $[echo $LANG | cut -c1-2]
setglobal configuredClient = ''""

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

}

## Allows to call the users configured client without if statements everywhere
proc httpGet
{
  match $configuredClient {
    with curl curl -A curl -s @Argv
    with wget wget -qO- @Argv
    with fetch fetch -o "..."
  }
}


proc getIPWeather
{
  setglobal country = $[httpGet ipinfo.io/country] > /dev/null ## grab the country
  if [[ $country == "US" ]]{ ## if were in the us id rather not use longitude and latitude so the output is nicer
    setglobal city = $[httpGet ipinfo.io/city] > /dev/null
    setglobal region = $[httpGet ipinfo.io/region] > /dev/null
    setglobal region = $[echo $region | tr -dc '[:upper:]]
    httpGet $locale.wttr.in/$city,$region$1
  } else { ## otherwise we are going to use longitude and latitude
    setglobal location = $[httpGet ipinfo.io/loc] > /dev/null
    httpGet $locale.wttr.in/$location$1
  }
}

proc getLocationWeather
{
  setglobal args = $[echo @Argv | tr " " +]
  httpGet $locale.wttr.in/$(args)
}

proc checkInternet
{
  echo "GET http://google.com HTTP/1.0\n\n" | nc google.com 80 > /dev/null !2 > !1 # query google with a get request
  if test $Status -eq 0 { #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
  }
}

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
  setglobal repositoryName = '"Bash-Snippets'" #Name of repostiory to be updated ex. Sandman-Lite
  setglobal githubUserName = '"alexanderepstein'" #username that hosts the repostiory ex. alexanderepstein
  setglobal nameOfInstallFile = '"install.sh'" # change this if the installer file has a different name be sure to include file extension if there is one
  setglobal 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 usage
{
  echo "Weather"
  echo "Description: Provides a 3 day forecast on your current location or a specified location."
  echo "  With no flags Weather will default to your current location."
  echo "Usage: weather or weather [flag] or weather [country] or weather [city] [state]"
  echo "  weather [i] get weather in imperial units"
  echo "  weather [m] get weather in metric units"
  echo "  weather [Moon] grabs the phase of the moon"
  echo "  -u Update Bash-Snippet Tools"
  echo "  -h Show the help"
  echo "  -v Get the tool version"
  echo "Examples:"
  echo "  weather"
  echo "  weather Tokyo"
  echo "  weather Moon"
  echo "  weather m"
}

getConfiguredClient || exit 1
checkInternet || exit 1 # check if we have a valid internet connection if this isnt true the rest of the script will not work so stop here




while getopts "uvh" opt {
  match $opt {
    with \?
      echo "Invalid option: -$OPTARG" > !2
      exit 1
    
    with h
      usage
      exit 0
    
    with v
      echo "Version $currentVersion"
      exit 0
    
    with u
      update
      exit 0
    
    with :
      echo "Option -$OPTARG requires an argument." > !2
      exit 1
    
  }
}

if [[ $# == "0" ]] {
  getIPWeather
} elif [[ $1 == "help" ]]{
  usage
} elif [[ $1 == "update" ]] {
  update
} elif [[ $1 == "m" ]] {
  getIPWeather "?m"
} elif [[ $1 == "i" ]] {
  getIPWeather "?u"
} else {
  getLocationWeather @Argv
}