# This script allows to maintain a github hosted page
# First: make sure to clone or init your git in the destination directory
#   this script will make a backup of the .git directory
#   once vuepress has built again (replacing all things in destination directory)
#   this script will restore the original .git directory
# Finally you can git add . & commit as you wish
# so .git directory will always be the latest one

cls
Write-Host "Vuepress git tool v1.0"
Write-Host "Author: vhanla"

function Show-Menu {
  param(
    [string]$Title = 'Options'
  )
  Write-Host "================== $Title =================="

  Write-Host "1: Develop."
  Write-Host "2: Build."
  Write-Host "3: Deploy."
  # Write-Host "Q: Quit."
}

function Is-Root {
  if(Test-Path -Path ($PWD.Path + '\.vuepress')){
    return $true
  }
  else {
    Write-Host 'Wrong directory!'
    return $false
  }
}

function Config-Exists {
  if(Test-Path ($PWD.Path + '.\.vuepress\config.js')){
    return $true
  }
  else {
    return $false
  }
}

function Copy-ToEmptyDir($source, $dest){
  Delete-Dir $dest

  if (Test-Path $source){
    Create-Dir $dest
    Copy-Item $source\* $dest -Recurse -Force
    return $true
  }else{
    Write-Host 'Warning! no GIT repository in ' $source
    return $false
  }
}

function Delete-Dir ($dir){
  if(Test-Path $dir){
    Get-ChildItem -Path $dir -Force -Recurse | Remove-Item -Force -Recurse
    Remove-Item $dir -Force
  }
}

function Create-Dir ($dir){
  New-Item -ItemType Directory -Force -Path $dir
}

function Get-DistDir {
  # assume it is on root path
  if (Config-Exists){
    $config = Get-Content -Path ($PWD.Path + '.\.vuepress\config.js')
    $json = $config -replace '^(\s)*module.exports(\s)*=(\s)*'
    $dist = ''
    $dist = (((($json -match '(,)*(\s)*dest(.)*(,)*') -replace '(,)*(\s)*dest(\s)*:') -replace ',').Trim() -replace "'") -replace '"'
    if (!$dist.Trim()){
      # we should use the default .vuepress/dist folder
      $dist = $PWD.Path + '\.vuepress\dist'
    }
    else{
      $dist = $PWD.Path + '\' + $dist
    }
    return $dist
  }
  else{
    return ($PWD.Path + '\.vuepress\dist')
  }
}
function Copy-GitDir {
  if (Is-Root){
    $dest = Get-DistDir
    # we need to copy .git directory, the other files don't matter
    Copy-ToEmptyDir ($dest + '\.git') ($PWD.Path + '\.vuepress\git')
    Delete-Dir $dest
  }
}
function Restore-GitDir {
  if (Is-Root){
    $dest = Get-DistDir
    Copy-ToEmptyDir ($PWD.Path + '\.vuepress\git') ($dest + '\.git')
  }
}

# do{
  Show-Menu
  $input = Read-Host "Please make a selection"
  switch ($input) {
    '1' {
      cls
      vuepress dev
    }
    '2' {
      Copy-GitDir
      vuepress build
      Restore-GitDir
    }
    '3' {
      $location = Get-DistDir
      Set-Location -Path $location
    }
    'q' {
      return
    }
  }
# }
# until ($input -eq 'q')