// Licensed to Apache Software Foundation (ASF) under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Apache Software Foundation (ASF) licenses this file to you under
// the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

package completion

import (
	"fmt"

	"github.com/urfave/cli/v2"
)

var powershellCommand = &cli.Command{
	Name:      "powershell",
	Aliases:   []string{"p"},
	Usage:     "Output shell completion code for powershell",
	ArgsUsage: "[parameters...]",
	Action: func(_ *cli.Context) error {
		fmt.Print(powershellScript)
		return nil
	},
}

const powershellScript = `
Register-ArgumentCompleter -Native -CommandName swctl -ScriptBlock {
	param($commandName, $commands, $cursorPosition)

	$match = $($(complete $commands $cursorPosition) -split " ")
	# Output matched commands one by one.
	for($i=0; $i -lt ($match.Length-1); $i+=1){
		  Write-Output $match[$i]
	}
}
# Find all matching commands.
function complete($commands, $cursorPosition){
	# Get command line parameters.
	$parameters = $($commands -split " ")
	# Uncompleted parameters.
	$uncomplete = $parameters[-1]

	# Get the parameters before $uncomplete.
	$len = $parameters.Length-2
	if ("$commands".Length -ne $cursorPosition) { return "" }
	$beforeCommands = $parameters[0..($len)]

	# Find the command prefixed with $uncomplete.
	$match = ""
	Invoke-Expression "$beforeCommands --auto_complete" | ForEach-Object {
		  $flag = 1
		  for ($i=0; $i -lt $uncomplete.Length; $i = $i +1){
				if ($_[$i] -ne $uncomplete[$i]) { $flag = 0 }
		  }
		  if ($flag -eq 1) {  $match+="$_ " }
	}
	return $match
}

`