<#
	.SYNOPSIS
	Installer script for VeeamNotify.
	.DESCRIPTION
	Installs VeeamNotify from one of the following:
		1) Latest release;
		2) Latest prerelease;
		3) Specific version;
		4) A named branch;
		5) A pull request.
	This script can also optionally launch a deployment script to apply the VeeamNotify configuration to all or selected Veeam jobs. You will be prompted for this after installation.
	.PARAMETER Latest
	Choose between "Release" or "Prerelease" to install the latest release or pre-release.
	.PARAMETER Version
	Specify a version to install (e.g. 'v1.0')
	.PARAMETER Branch
	Specify a branch name to install - TESTING ONLY
	.PARAMETER PullRequest
	Specify a pull request ID to install - TESTING ONLY
	.PARAMETER NonInteractive
	Switch for noninteractive installation. No prompts to choose versions or configurations will appear when specified, and one of the above parameters must also be specified.
	.PARAMETER InstallParentPath
	Path to VeeamNotify destination directory. Default: 'C:\VeeamScripts'
	.INPUTS
	None
	.OUTPUTS
	None
	.EXAMPLE
	PS> Installer.ps1
	.EXAMPLE
	PS> Installer.ps1 -Latest release
	.EXAMPLE
	PS> Installer.ps1 -Version 'v1.0' -NonInteractive
	.EXAMPLE
	PS> Installer.ps1 -PullRequest '123'
	.NOTES
	Authors: tigattack, philenst
	.LINK
	https://github.com/tigattack/VeeamNotify/wiki
#>

#Requires -RunAsAdministrator

[CmdletBinding(DefaultParameterSetName = 'None')]
param(
	[Parameter(ParameterSetName = 'None', Position = 0)]
	[Parameter(ParameterSetName = 'Version', Position = 0)]
	[Parameter(ParameterSetName = 'Release', Position = 0)]
	[Parameter(ParameterSetName = 'Branch', Position = 0)]
	[Parameter(ParameterSetName = 'PullRequest', Position = 0)]
	[String]$InstallParentPath = 'C:\VeeamScripts',

	[Parameter(ParameterSetName = 'Version', Position = 1, Mandatory)]
	# Built-in parameter validation disabled - See https://github.com/tigattack/VeeamNotify/issues/50
	# [ValidatePattern('^v(\d+\.)?(\d+\.)?(\*|\d+)$')]
	[String]$Version,

	[Parameter(ParameterSetName = 'Release', Position = 1, Mandatory)]
	# Built-in parameter validation disabled - See https://github.com/tigattack/VeeamNotify/issues/50
	# [ValidateSet('Release', 'Prerelease')]
	[String]$Latest,

	[Parameter(ParameterSetName = 'Branch', Position = 1, Mandatory)]
	[String]$Branch,

	[Parameter(ParameterSetName = 'PullRequest', Position = 1, Mandatory)]
	[String]$PullRequest,

	[Parameter(ParameterSetName = 'Version', Position = 2)]
	[Parameter(ParameterSetName = 'Release', Position = 2)]
	[Parameter(ParameterSetName = 'Branch', Position = 2)]
	[Parameter(ParameterSetName = 'PullRequest', Position = 2)]
	[Switch]$NonInteractive
)

#region Functions

function Test-InstallationPrerequisites {
	[CmdletBinding()]
	param (
		[Parameter(Mandatory)]
		[string]$Project,

		[Parameter(Mandatory)]
		[string]$InstallPath,

		[Parameter()]
		[string]$Version,

		[Parameter()]
		[string]$Latest
	)

	# Check if this project is already installed and if so, exit
	if (Test-Path "$InstallPath\$Project\resources\version.txt") {
		$installedVersion = (Get-Content -Raw "$InstallPath\$Project\resources\version.txt").Trim()
		Write-Host -ForegroundColor Yellow "`n$Project $installedVersion is already installed. This script cannot update an existing installation."
		Write-Host -ForegroundColor Yellow "Please manually update or delete/rename the existing installation and retry.`n`n"
		return $false
	}
	elseif ((Test-Path "$InstallPath\$Project") -and (Get-ChildItem "$InstallPath\$Project").Count -gt 0) {
		"`nThe install path ($InstallPath\$Project) already exists with children, " `
			+ "but an existing installation couldn't be detected (looking for $InstallPath\$Project\resources\version.txt)." | Write-Host
		Write-Host "Please remove the install path and retry.`n`n"
		return $false
	}

	# Validate Version parameter if provided
	if ($Version -and $Version -notmatch '^v(\d+\.)?(\d+\.)?(\*|\d+)$') {
		Write-Warning "Version parameter value '$Version' does not match the version naming structure."
		return $false
	}

	# Validate Latest parameter if provided
	if ($Latest -and $Latest -notin 'Release', 'Prerelease') {
		Write-Warning "Latest parameter value must be one of 'Release' or 'Prelease'."
		return $false
	}

	return $true
}

function Get-GitHubReleaseInfo {
	[CmdletBinding()]
	[OutputType([hashtable])]
	param (
		[Parameter(Mandatory)]
		[string]$Project
	)

	[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
	try {
		$releases = Invoke-RestMethod -Uri "https://api.github.com/repos/tigattack/$Project/releases" -Method Get
		$branches = (Invoke-RestMethod -Uri "https://api.github.com/repos/tigattack/$Project/branches" -Method Get).name

		# Parse latest release and latest prerelease
		$latestPrerelease = $null
		$latestStable = $null

		foreach ($i in $releases) {
			if ($i.prerelease -and -not $latestPrerelease) {
				$latestPrerelease = $i.tag_name
			}
		}

		foreach ($i in $releases) {
			if (-not $i.prerelease -and -not $latestStable) {
				$latestStable = $i.tag_name
			}
		}

		return @{
			Releases         = $releases
			Branches         = $branches
			LatestPrerelease = $latestPrerelease
			LatestStable     = $latestStable
		}
	}
	catch {
		$versionStatusCode = $_.Exception.Response.StatusCode.value__
		Write-Warning "Failed to query GitHub for $Project releases."
		throw "HTTP status code: $versionStatusCode"
	}
}

function Get-GitHubPRInfo {
	[CmdletBinding()]
	[OutputType([hashtable])]
	param (
		[Parameter(Mandatory)]
		[string]$Project,

		[Parameter(Mandatory)]
		[string]$PullRequestId
	)

	try {
		$prInfo = Invoke-RestMethod -Uri "https://api.github.com/repos/tigattack/$Project/pulls/$PullRequestId" -Method Get
		return $prInfo
	}
	catch {
		if ($_.Exception.Response.StatusCode.value__ -eq 404) {
			Write-Warning "Pull request $PullRequestId not found."
		}
		else {
			Write-Warning "Failed to query GitHub for pull request $PullRequestId."
		}
		throw
	}
}

function Get-InstallationSource {
	[CmdletBinding()]
	[OutputType([System.Collections.Hashtable])]
	param (
		[Parameter(Mandatory)]
		[string]$Project,

		[Parameter()]
		[string]$Version,

		[Parameter()]
		[string]$Latest,

		[Parameter()]
		[string]$Branch,

		[Parameter()]
		[string]$PullRequest,

		[Parameter()]
		[switch]$NonInteractive,

		[Parameter(Mandatory)]
		[hashtable]$GitHubInfo
	)

	$releases = $GitHubInfo.Releases
	$branches = $GitHubInfo.Branches
	$latestStable = $GitHubInfo.LatestStable
	$latestPrerelease = $GitHubInfo.LatestPrerelease

	# If no installation source provided and interactive mode enabled, query user
	if (-not $Version -and -not $Latest -and -not $Branch -and -not $PullRequest -and -not $NonInteractive) {
		# Query download type / release stream
		if ($releases) {
			[System.Management.Automation.Host.ChoiceDescription[]]$downloadQuery_opts = @()
			$downloadQuery_opts += New-Object System.Management.Automation.Host.ChoiceDescription '&Release', "Download the latest release or prerelease. You will be prompted if there's a choice between the two."
			$downloadQuery_opts += New-Object System.Management.Automation.Host.ChoiceDescription '&Version', 'Download a specific version.'
			$downloadQuery_opts += New-Object System.Management.Automation.Host.ChoiceDescription '&Branch', '[TESTING ONLY] Download a branch.'
			$downloadQuery_opts += New-Object System.Management.Automation.Host.ChoiceDescription '&PullRequest', '[TESTING ONLY] Download a pull request.'
			$downloadQuery_result = $host.UI.PromptForChoice(
				'Download Source',
				"Please select a download source for $Project",
				$downloadQuery_opts,
				0
			)
		}
		else {
			$installFromBranchPrompt = @{
				Title        = 'Would you like to install from a branch?'
				Description  = "There are currently no releases or prereleases available for $Project."
				Default      = 'Yes'
				OptionATitle = 'Install from Branch'
				OptionBTitle = 'Exit Installer'
			}
			if (YesNoPrompt @installFromBranchPrompt) {
				$downloadQuery_result = 2
			}
			else {
				exit
			}
		}

		# Set download type
		$releasePrompt = $false
		switch ($downloadQuery_result) {
			0 {
				if ($latestStable -and $latestPrerelease) {
					# Query release stream
					$releasePrompt = $true
					$releaseTypePrompt = @{
						Title = 'Release Selection'
						Description = "Which release type would you like to install?`nLatest stable: $latestStable`nLatest prerelease: $latestPrerelease"
						Default = 'Yes'
						OptionAKey = 'Stable' ; OptionATitle = 'Install Latest Stable'
						OptionBKey = 'Prerelease' ; OptionBTitle = 'Install Latest Prerelease'
					}
					if (YesNoPrompt @releaseTypePrompt) {
						$Latest = 'Release'
					}
					else {
						$Latest = 'Prerelease'
					}
				}
				elseif ($latestStable) {
					$Latest = 'Release'
				}
				elseif ($latestPrerelease) {
					$installPrereleasePrompt = @{
						Title        = 'Do you wish to install the latest prerelease?'
						Description  = 'You chose release, but the only available releases are prereleases.'
						OptionATitle = 'Install Prerelease'
						OptionBTitle = 'Exit Installer'
					}
					if (YesNoPrompt @installPrereleasePrompt) {
						$Latest = 'Prerelease'
					}
					else {
						exit
					}
				}
			}
			1 {
				do {
					$Version = ($host.UI.Prompt(
							'Version Selection',
							"Please enter the version you wish to install.`nAvailable versions:`n $(foreach ($tag in $releases.tag_name) {"$tag`n"})",
							'Version'
						)).Version
					if ($releases.tag_name -notcontains $Version) { Write-Host "`nInvalid version, please try again." }
				} until (
					$releases.tag_name -contains $Version
				)
			}
			2 {
				do {
					$Branch = ($host.UI.Prompt(
							'Branch Selection',
							"Please enter the name of the branch you wish to install.`nAvailable branches:`n $(foreach ($branch in $branches) {"$branch`n"})",
							'Branch'
						)).Branch
					if ($branches -notcontains $Branch) { Write-Host "`nInvalid branch name, please try again." }
				} until (
					$branches -contains $Branch
				)
			}
			3 {
				do {
					# Get PR source in format owner:branch
					$PullRequest = ($host.UI.Prompt(
							'Pull Request Source',
							"Please enter the pull request number (e.g. '123')",
							'PullRequest'
						)).PullRequest

					if ($PullRequest -notmatch '^\d+$') {
						Write-Host "`nPull request ID must be a number (e.g. '123'). Please try again."
					}
				} until (
					$PullRequest -match '^\d+$'
				)
			}
		}
	}

	# Download branch if specified
	if ($Branch) {
		# Throw if branch not found
		if (-not $branches.Contains($Branch)) {
			throw "Branch '$Branch' not found. Will not prompt for branch in non-interactive mode."
		}

		# Set $releaseName to branch name
		$releaseName = $Branch

		# Define download URL
		$downloadUrl = "https://api.github.com/repos/tigattack/$Project/zipball/$Branch"
	}
	# Download pull request if specified
	elseif ($PullRequest) {
		try {
			$prInfo = Get-GitHubPRInfo -Project $Project -PullRequestId $PullRequest
			$prCreator = $prInfo.user.login
			$prRepoName = $prInfo.head.repo.name
			$prSrcBranch = $prInfo.head.ref
		}
		catch { exit 1 }
		$downloadUrl = "https://api.github.com/repos/${prCreator}/${prRepoName}/zipball/$prSrcBranch"
		$releaseName = "PR #$PullRequest by $prCreator"
	}
	# Otherwise work with versions
	else {
		# Define release to use
		if ($Latest) {
			switch ($Latest) {
				'Release' {
					$releaseName = $latestStable
				}
				'Prerelease' {
					$releaseName = $latestPrerelease
				}
			}
		}
		elseif ($Version) {
			$releaseName = $Version
		}

		if (($Latest -or $releasePrompt) -and (-not $releaseName)) {
			Write-Warning 'A release of the specified type could not found.'
			exit
		}

		# Define download URL
		$releases = Invoke-RestMethod "https://api.github.com/repos/tigattack/$Project/releases"
		foreach ($i in $releases) {
			if ($i.tag_name -eq $releaseName) {
				$downloadUrl = $i.assets[0].browser_download_url
				break
			}
		}

		if (-not $downloadUrl) {
			Write-Warning "No download URL found for release '$releaseName'."
			exit
		}
	}

	# Sanitise releaseName for OutFile if installing from branch or pull request
	if ($Branch -or $PullRequest) {
		$outFile = "$Project-$($releaseName -replace '[\W]','-')"
	}
	else {
		$outFile = "$Project-$releaseName"
	}

	return @{
		ReleaseName = $releaseName
		OutFile     = $outFile
		DownloadUrl = $downloadUrl
	}
}

function Install-DownloadedProject {
	[CmdletBinding()]
	param (
		[Parameter(Mandatory)]
		[string]$Project,

		[Parameter(Mandatory)]
		[string]$InstallParentPath,

		[Parameter(Mandatory)]
		[string]$DownloadUrl,

		[Parameter(Mandatory)]
		[string]$OutFile,

		[Parameter(Mandatory)]
		[string]$ReleaseName
	)

	$tempDir = [System.IO.Path]::GetTempPath()
	$downloadPath = Join-Path -Path $tempDir -ChildPath "${OutFile}.zip"

	# Download parameters
	$DownloadParams = @{
		Uri     = $DownloadUrl
		OutFile = $downloadPath
	}

	# Download project from GitHub
	try {
		Write-Host "`nDownloading $Project $ReleaseName from GitHub..."
		Invoke-WebRequest @DownloadParams
	}
	catch {
		$downloadStatusCode = $_.Exception.Response.StatusCode.value__
		Write-Warning "Failed to download $Project $ReleaseName."
		if ($_.Exception.Response) {
			throw "HTTP status code: $downloadStatusCode"
		}
		else {
			throw $_
		}
	}

	# Unblock downloaded ZIP
	Write-Host 'Unblocking ZIP...'
	Unblock-File -Path $downloadPath -ErrorAction Continue

	# Extract release to destination path
	Write-Host "Extracting files to '$InstallParentPath'..."
	Expand-Archive -Path $downloadPath -DestinationPath "$InstallParentPath" -Force

	# Rename destination and tidy up
	Write-Host 'Renaming directory and removing download artefact...'

	$destinationPath = Join-Path -Path $InstallParentPath -ChildPath $OutFile

	if (Test-Path $destinationPath) {
		Rename-Item -Path $destinationPath -NewName "$Project"
	}
	else {
		# Necessary to handle branch downloads, which come as a ZIP containing a directory named similarly to "tigattack-VeeamNotify-2100906".
		# Look for a directory less than 5 minutes old which matches the pattern described above.
		(Get-ChildItem $InstallParentPath | Where-Object {
			$_.LastWriteTime -gt (Get-Date).AddMinutes(-5) -and
			$_.Name -match ".*-$Project-.*" -and
			$_.PsIsContainer
		})[0] | Rename-Item -NewName "$Project"
	}

	# Unblock PS and DLL files in installation directory
	Write-Host 'Unblocking executable files in installation directory...'
	$srcFiles = Get-ChildItem -Path "$InstallParentPath\$Project" -Recurse | Where-Object {
		$_.Name -match '\.(ps\w*|dll)$'
	}

	try {
		$srcFiles | Unblock-File
	}
	catch {
		Write-Warning 'Failed to unblock downloaded files. You will need to run the following command manually once installation is complete:'
		Write-Host "gci $InstallParentPath -Recurse | ?{$_.Name -match '\.(ps\w*|dll)$'} | Unblock-File"
	}

	# Clean up temp files
	Remove-Item -Path $downloadPath
}

function Set-ProjectConfiguration {
	[CmdletBinding()]
	param (
		[Parameter(Mandatory)]
		[string]$Project,

		[Parameter(Mandatory)]
		[string]$InstallParentPath
	)

	# Join config path
	$configPath = Join-Path -Path $InstallParentPath -ChildPath $Project | Join-Path -ChildPath 'config\conf.json'

	# Create config from example if it doesn't exist
	if (-not (Test-Path $configPath)) {
		Write-Host "`nCreating configuration file..."
		$exampleConfig = Join-Path -Path $InstallParentPath -ChildPath $Project | Join-Path -ChildPath 'config\conf.example.json'
		Copy-Item -Path $exampleConfig -Destination $configPath
	}

	# Get config
	$config = Get-Content "$configPath" -Raw | ConvertFrom-Json

	# Configure service
	$config, $serviceType = Set-NotificationService -Config $config

	# Configure mentions
	if ($serviceType -ne 4) {
		$config = Set-MentionPreference -Config $config -ServiceType $serviceType
	}
	else {
		Write-Verbose 'Skipping mention preference configuration as mentions are not supported for the chosen service.'
	}

	# Write config
	try {
		ConvertTo-Json $config -Depth 10 | Set-Content "$configPath"
		Write-Host "`nConfiguration set successfully."
		Write-Host "Further options than those available in this script can be found in the config file at:`n${configPath}."
	}
	catch {
		Write-Warning "Failed to write configuration file at `"$configPath`". Please open the file and complete configuration manually."
	}

	# Run configuration deployment tool
	Invoke-DeploymentTool -InstallParentPath $InstallParentPath -Project $Project

	return $configPath
}

function Set-NotificationService {
	[CmdletBinding()]
	[OutputType([object[]])]
	param (
		[Parameter(Mandatory)]
		[PSCustomObject]$Config
	)

	# Prompt user with config options
	$servicePrompt_discord = New-Object System.Management.Automation.Host.ChoiceDescription '&Discord', 'Send notifications to Discord.'
	$servicePrompt_slack = New-Object System.Management.Automation.Host.ChoiceDescription '&Slack', 'Send notifications to Slack.'
	$servicePrompt_teams = New-Object System.Management.Automation.Host.ChoiceDescription '&Microsoft Teams', 'Send notifications to Microsoft Teams.'
	$servicePrompt_telegram = New-Object System.Management.Automation.Host.ChoiceDescription '&Telegram', 'Send notifications to Telegram.'
	$servicePrompt_http = New-Object System.Management.Automation.Host.ChoiceDescription '&HTTP', 'Send job data to HTTP endpoint.'
	$servicePrompt_result = $host.UI.PromptForChoice(
		'Notification Service',
		'Which service do you wish to send notifications to?',
		@(
			$servicePrompt_discord,
			$servicePrompt_slack,
			$servicePrompt_teams,
			$servicePrompt_telegram,
			$servicePrompt_http
		),
		-1
	)

	# Prompt for webhook URL based on selected service
	$webhookPrompt = "`nPlease enter your webhook URL"
	switch ($servicePrompt_result) {
		0 {
			$Config.services.discord.enabled = $true
			$Config.services.discord.webhook = Read-Host -Prompt $webhookPrompt
		}
		1 {
			$Config.services.slack.enabled = $true
			$Config.services.slack.webhook = Read-Host -Prompt $webhookPrompt
		}
		2 {
			$Config.services.teams.enabled = $true
			$Config.services.teams.webhook = Read-Host -Prompt $webhookPrompt
		}
		3 {
			$Config.services.telegram.enabled = $true
			$Config.services.telegram.bot_token = Read-Host -Prompt "`nPlease enter your Telegram bot token"
			$Config.services.telegram.chat_id = Read-Host -Prompt "`nPlease enter your Telegram chat ID"
		}
		4 {
			$Config.services.http.enabled = $true
			$Config.services.http.url = Read-Host -Prompt "`nPlease enter your HTTP endpoint URL"
			Write-Host "`nNow select the HTTP method to use. Note:"
			Write-Host "- If POST is selected, the job data will be sent as a JSON payload.`n- If GET is selected, the job data will be sent as query parameters."
			$Config.services.http.method = Read-Host -Prompt "`nPOST or GET [POST]"
			$methodEmpty = [string]::IsNullOrWhitespace($Config.services.http.method)
			if ($methodEmpty -or $Config.services.http.method -notmatch '^(POST|GET)$') {
				if (-not $methodEmpty) {
					Write-Warning 'Invalid HTTP method specified. Defaulting to POST.'
				}
				$Config.services.http.method = 'POST'
			}
		}
	}

	return $Config, $servicePrompt_result
}

function Set-MentionPreference {
	[CmdletBinding()]
	[OutputType([PSCustomObject])]
	param (
		[Parameter(Mandatory)]
		[PSCustomObject]$Config,

		[Parameter()]
		[int]$ServiceType
	)

	$mentionPreference_no = New-Object System.Management.Automation.Host.ChoiceDescription '&No', 'Do not mention me.'
	$mentionPreference_warn = New-Object System.Management.Automation.Host.ChoiceDescription '&Warning', 'Mention me when a session finishes in a warning state.'
	$mentionPreference_fail = New-Object System.Management.Automation.Host.ChoiceDescription '&Failure', 'Mention me when a session finishes in a failed state.'
	$mentionPreference_warnfail = New-Object System.Management.Automation.Host.ChoiceDescription '&Both', 'Notify me when a session finishes in either a warning or a failed state.'
	$mentionPreference_result = $host.UI.PromptForChoice(
		'Mention Preference',
		'Do you wish to be mentioned/tagged when a session finishes in one of the following states?',
		@(
			$mentionPreference_no,
			$mentionPreference_warn,
			$mentionPreference_fail,
			$mentionPreference_warnfail
		),
		2
	)

	if ($mentionPreference_result -ne 0) {
		switch ($ServiceType) {
			0 {
				$Config.services.discord.user_id = Read-Host -Prompt "`nPlease enter your Discord user ID"
			}
			1 {
				$Config.services.slack.user_id = Read-Host -Prompt "`nPlease enter your Slack member ID"
			}
			2 {
				$Config.services.teams.user_id = Read-Host -Prompt "`nPlease enter your Teams email address"
				Write-Host "`nTeams also requires a name to be specified for mentions.`nIf you do not specify anything, your username (from your email address) will be used."
				$Config.services.teams.display_name = Read-Host -Prompt 'Please enter your Teams display name (e.g. John Smith)'
			}
			3 {
				$Config.services.telegram.user_name = Read-Host -Prompt "`nPlease enter your Telegram username"
			}
		}
	}

	# Set config values
	switch ($mentionPreference_result) {
		0 {
			$Config.mentions.on_failure = $false
			$Config.mentions.on_warning = $false
		}
		1 {
			$Config.mentions.on_failure = $false
			$Config.mentions.on_warning = $true
		}
		2 {
			$Config.mentions.on_failure = $true
			$Config.mentions.on_warning = $false
		}
		3 {
			$Config.mentions.on_failure = $true
			$Config.mentions.on_warning = $true
		}
	}

	return $Config
}

function Invoke-DeploymentTool {
	[CmdletBinding()]
	param (
		[Parameter(Mandatory)]
		[string]$InstallParentPath,

		[Parameter(Mandatory)]
		[string]$Project
	)

	# Query for configuration deployment script.
	$runDeploymentToolPrompt = @{
		Title        = 'Configuration Deployment Tool'
		Description  = "Would you like to to run the VeeamNotify configuration deployment tool?`nNone of your job configurations will be modified without confirmation."
		Default      = 'Yes'
		OptionATitle = 'Run Deployment Tool'
		OptionBTitle = 'Skip Deployment Tool'
	}
	if (YesNoPrompt @runDeploymentToolPrompt) {
		Write-Host "`nRunning configuration deployment script...`n"
		& "$InstallParentPath\$Project\resources\DeployVeeamConfiguration.ps1" -InstallParentPath $InstallParentPath
	}
}

function YesNoPrompt {
	[CmdletBinding()]
	[OutputType([bool])]
	param (
		[Parameter(Mandatory)]
		[string]$Title,
		[Parameter(Mandatory)]
		[string]$Description,
		[Parameter()]
		[string]$Default = 'No',
		[Parameter()]
		[string]$OptionAKey = 'Yes',
		[Parameter()]
		[string]$OptionATitle = 'Yes',
		[Parameter()]
		[string]$OptionBKey = 'No',
		[Parameter()]
		[string]$OptionBTitle = 'No'
	)

	$defaultChoice = if ($Default -eq 'Yes') { 0 } else { 1 }

	$yesChoice = New-Object System.Management.Automation.Host.ChoiceDescription "&$OptionAKey", $OptionATitle
	$noChoice = New-Object System.Management.Automation.Host.ChoiceDescription "&$OptionBKey", $OptionBTitle
	$result = $host.UI.PromptForChoice(
		$Title,
		$Description,
		@($yesChoice, $noChoice),
		$defaultChoice
	)

	return $result -eq 0
}

#endregion Functions

# Main execution block
$project = 'VeeamNotify'
$ErrorActionPreference = 'Stop'

Write-Host -ForegroundColor Green @'
#######################################
#                                     #
#        VeeamNotify Installer        #
#                                     #
#######################################
'@

# Validate prerequisites
$validPrereqs = Test-InstallationPrerequisites -Project $project -InstallPath $InstallParentPath -Version $Version -Latest $Latest
if (-not $validPrereqs) { exit 1 }

# Get GitHub release info
$gitHubInfo = Get-GitHubReleaseInfo -Project $project

# Determine what to download and install
$downloadProperties = Get-InstallationSource -Project $project -Version $Version -Latest $Latest -Branch $Branch -PullRequest $PullRequest -NonInteractive:$NonInteractive -GitHubInfo $gitHubInfo

# Download and install the project
Install-DownloadedProject -Project $project `
	-InstallParentPath $InstallParentPath `
	-DownloadUrl $downloadProperties.DownloadUrl `
	-OutFile $downloadProperties.OutFile `
	-ReleaseName $downloadProperties.ReleaseName

# Configure the installation if not running in non-interactive mode
if (-not $NonInteractive) {
	if (-not (YesNoPrompt -Title "$Project Configuration" -Description 'Would you like to configure the installation now?')) {
		Write-Host "`nYou can configure VeeamNotify later by editing the config file located at:`n$InstallParentPath\$project\config\conf.json"
	}
	else {
		Set-ProjectConfiguration -Project $project -InstallParentPath $InstallParentPath | Out-Null
	}
}
else {
	$configPath = Join-Path -Path $InstallParentPath -ChildPath $project | Join-Path -ChildPath 'config\conf.json'
	Write-Host "`nWill not prompt for VeeamNotify configuration, or to run Veeam configuration deployment script in non-interactive mode."
	Write-Host "`nConfiguration can be found in:`n$configPath."
}

Write-Host -ForegroundColor Green "`nInstallation complete!`n"