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

setglobal currentVersion = '"1.11.1'"
setglobal configuredClient = ''""
setglobal private = '"0'" ## state of private flag
setglobal all = '"0'" ## state of all flag
if test -d ~/temp{ rm -rf ~/temp; } ## if the temp folder exists we want to delete it just in case it was left over from a fatal error


## 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
  }

}

proc 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 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
  }
}

## 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 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"
    }
  }

}

## This grabs the users bitbucket info could be improved by making sure username exists
proc getBitbucketInfo
{
  echo -n 'Enter your Bitbucket username: '
  read bbUsername
  if [[ $bbUsername == "1" ]]{
    echo  "Using github username as bitbucket username"
  }
  echo -n 'Enter your Bitbucket password: '
  read -s password  # -s flag hides password text;
}

proc backupRepo
{
  setglobal timestamp = $[date | tr " " _ | tr : _] ## we do this because it takes care of changes bitbucket would have made
  cd ~/temp/github/$repoName || do { echo "Fatal error"; return 1; }
  if [[ $private == "1" ]]{
    httpGet --user $bbUsername:$password https://api.bitbucket.org/1.0/repositories/ --data name=$repoName$timestamp is_private=true > /dev/null
    echo "private"
  } else {
    httpGet --user $bbUsername:$password https://api.bitbucket.org/1.0/repositories/ --data name=$repoName$timestamp > /dev/null
  }
  setglobal originalRepoName = $repoName
  setglobal repoName = $[echo $repoName | tr '[:upper:]' '[:lower:]]
  setglobal timestamp = $[echo $timestamp | tr '[:upper:]' '[:lower:]]
  git remote set-url origin https://$bbUsername:$password@bitbucket.org/$bbUsername/$repoName$timestamp.git > /dev/null || return 1 ## switch the remote over to bitbucket rather than github
  echo "Uploading $originalRepoName to bitbucket"
  git push -q --progress origin --all > /dev/null || return 1 ## pushes al files to github and most of the repo history
  echo "Uploading the tags for $originalRepoName"
  git push -q --progress origin --tags > /dev/null || return 1 ## have to push tags here since --tags and --all are mutually exclusive
  echo "Successfully backedup $originalRepoName"
  rm -rf ~/temp #if we have succesfully backedup the repo we dion't need this anymore and if we do we will recreate it
}


## When cloudup is called with no flags
proc getGitHubRepoInfo
{
  echo -n 'Enter the name of the repostiory to backup: '
  read repoName
}

## This grabs github user info could be improved upon by checking if user exists
proc getGitHubUserInfo
{
  echo -n 'Enter your Github username: '
  read ghUsername
}

## function that handles cloning a repository it uses $ghUsername and $repoName
proc cloneGitHubRepo
{
  mkdir ~/temp
  cd || do { echo "Fatal error"; return 1; }
  mkdir ~/temp/github || do { echo "Fatal error"; return 1; }
  cd ~/temp/github || do { echo "Fatal error"; return 1; }
  echo "Cloning $repoName"
  git clone -q --progress https://github.com/$ghUsername/$repoName || return 1
  echo "Successfully cloned $repoName"
}

## Grabs the last 100 updated repos and greps to grab the repository names and puts them in an array called repoNames
proc getGithubRepoNames
{
  setglobal response = $[httpGet "https://api.github.com/users/$ghUsername/repos?sort=updated&per_page=100"  | grep -Eo '"name": "[ a-Z .  \/ \\ 0-9 -- _ ]*' | sed  s/'"name": "'/""/g]
  for repo in [$response]
  {
    setglobal repoNames = '('"$repo")
  }
}

proc usage
{
  echo "Cloudup"
  echo "Description: Backs up a users github repositories to your bitbucket account."
  echo "  With no flags cloudup will guide you through backing up a single repository"
  echo "Usage: cloudup [flags] or cloudup [flags] [listOfGHRepoNamesSplitBySpaces]"
  echo "  -p Upload the repositor(y)(ies) as private to bitbucket (must have private repo ability on bitbucket)"
  echo "  -a Backup all github repositories"
  echo "  -u Update Bash-Snippet Tools"
  echo "  -h Show the help"
  echo "  -v Get the tool version"
  echo "Examples:"
  echo "   cloudup"
  echo "   cloudup -p -a"
  echo "   cloudup -p nameOfRepo1 nameOf Repo2"
  echo "   cloudup nameOfRepo"
}

getConfiguredClient || exit 1
checkInternet || exit 1

while getopts "pauvh" opt {
  match $opt {
    with \?
      echo "Invalid option: -$OPTARG" > !2
      exit 1
    
    with p
      setglobal private = '"1'"
      echo "Feature not added yet, for now all backups must be public (can be manually set to private through bitbucket after backup)" > !2
      exit 0
    
    with h
      usage
      exit 0
    
    with a
      setglobal all = '"1'"
    
    with v
      echo "Version $currentVersion"
      exit 0
    
    with u
      update
      exit 0
    
    with :
      echo "Option -$OPTARG requires an argument." > !2
      exit 1
    
  }
}



if [[ $# == "1" ]] {
  if [[ $1 == "update" ]]{
    update
    exit 0
  } elif [[ $1 == "help" ]] {
    usage
    exit 0
  }
} elif test $Argc -ge 1{
  getGitHubUserInfo || exit 1
  getBitbucketInfo || exit 1
  echo
  if [[ $private != "1" ]]{
    for i in [@Argv] {  ## if private is not on as a flag start rpping through them
      setglobal repoName = $i
      echo "Starting to backup $repoName"
      cloneGitHubRepo || exit 1
      backupRepo  || do { echo "Error: couldnt backup $originalRepoName to bitbucket"; exit 1; }
      echo
    }
    exit 0
  } else {
    for i in [$(@:2)] {
      setglobal repoName = $i
      echo "Starting to backup $repoName"
      cloneGitHubRepo || exit 1
      backupRepo  || do { echo "Error: couldnt backup $originalRepoName to bitbucket"; exit 1; }
      echo
    }
    exit 0
  }
}


if [[ $all == "0" ]]{
  if [[ $1 == "" ]]{
    getGitHubUserInfo || exit 1
    getGitHubRepoInfo || exit 1
    getBitbucketInfo || exit 1
    echo
    cloneGitHubRepo || exit 1
    backupRepo  || do { echo "Error: couldnt backup $originalRepoName to bitbucket"; exit 1; }
    exit 0
  } else {
    getGitHubUserInfo || exit 1
    setglobal repoName = $1 || exit 1
    getBitbucketInfo || exit 1
    echo
    cloneGitHubRepo || exit 1
    backupRepo  || do { echo "Error: couldnt backup $originalRepoName to bitbucket"; exit 1; }
    exit 0
  }
} else {
  getGitHubUserInfo || exit 1
  getGithubRepoNames || exit 1
  getBitbucketInfo || exit 1
  echo
  for repo in [$(repoNames[@])]
  {
    setglobal repoName = $repo
    echo "Starting to backup $repoName"
    cloneGitHubRepo || exit 1
    backupRepo  || do { echo "Error: couldnt backup $repoName to bitbucket"; exit 1; }
    echo
  }
  echo "Successfully backed up all repositories"
  exit 0

}