if (-not ($IsWindows -or $PSVersionTable.PSEdition -eq 'Desktop')) {
    return
}

$settingsPath = Join-Path $env:LOCALAPPDATA 'Packages\Microsoft.WindowsTerminal_8wekyb3d8bbwe\LocalState\settings.json'
if (-not (Test-Path -LiteralPath $settingsPath)) {
    Write-Warning "Windows Terminal settings not found: $settingsPath"
    return
}

$PowerShellGuid = '{574e775e-4f2a-5b96-ac1e-a2962a402336}'
$LegacyPowerShellGuid = '{61c54bbd-c2c6-5271-96e7-009a87ff44bf}'
$changed = $false

function Get-JsonPropertyValue {
    param(
        [Parameter(Mandatory = $true)]
        $Object,
        [Parameter(Mandatory = $true)]
        [string]$Name
    )

    $Property = $Object.PSObject.Properties[$Name]
    if ($null -eq $Property) {
        return $null
    }

    return $Property.Value
}

function Test-JsonValueEqual {
    param(
        $Left,
        $Right
    )

    if ($null -eq $Left -and $null -eq $Right) {
        return $true
    }

    if ($null -eq $Left -or $null -eq $Right) {
        return $false
    }

    if (
        $Left -is [System.Collections.IEnumerable] -and
        -not ($Left -is [string])
    ) {
        return (ConvertTo-Json $Left -Depth 100 -Compress) -eq (ConvertTo-Json $Right -Depth 100 -Compress)
    }

    return $Left -eq $Right
}

function Set-JsonPropertyValue {
    param(
        [Parameter(Mandatory = $true)]
        $Object,
        [Parameter(Mandatory = $true)]
        [string]$Name,
        $Value
    )

    $Property = $Object.PSObject.Properties[$Name]
    if ($null -eq $Property) {
        $Object | Add-Member -NotePropertyName $Name -NotePropertyValue $Value
        $script:changed = $true
        return
    }

    if (-not (Test-JsonValueEqual -Left $Property.Value -Right $Value)) {
        $Property.Value = $Value
        $script:changed = $true
    }
}

function Test-IsPowerShell7Profile {
    param(
        [Parameter(Mandatory = $true)]
        $Profile
    )

    $Source = [string](Get-JsonPropertyValue -Object $Profile -Name source)
    $Name = [string](Get-JsonPropertyValue -Object $Profile -Name name)
    $CommandLine = [string](Get-JsonPropertyValue -Object $Profile -Name commandline)

    if ($Source -eq 'Windows.Terminal.PowershellCore') {
        return $true
    }

    if ($CommandLine -match '(?i)(^|[\\/ ])pwsh(?:\.exe)?(?:\s|$)') {
        return $true
    }

    return $Name -match '^(PowerShell|PowerShell 7)$'
}

function Test-IsDisposablePowerShell7Profile {
    param(
        [Parameter(Mandatory = $true)]
        $Profile
    )

    $Source = [string](Get-JsonPropertyValue -Object $Profile -Name source)
    $Name = [string](Get-JsonPropertyValue -Object $Profile -Name name)
    $CommandLine = [string](Get-JsonPropertyValue -Object $Profile -Name commandline)

    return (
        $Name -match '^(PowerShell|PowerShell 7)$' -and
        (
            $Source -eq 'Windows.Terminal.PowershellCore' -or
            $CommandLine -match '(?i)(^|[\\/ ])pwsh(?:\.exe)?(?:\s|$)'
        )
    )
}

try {
    $originalSettings = Get-Content -LiteralPath $settingsPath -Raw
    $settings = $originalSettings | ConvertFrom-Json
}
catch {
    Write-Warning "Failed to read Windows Terminal settings: $settingsPath"
    Write-Warning $_
    return
}

if ($null -eq (Get-JsonPropertyValue -Object $settings -Name profiles)) {
    $settings | Add-Member -NotePropertyName profiles -NotePropertyValue ([pscustomobject]@{
        defaults = [pscustomobject]@{}
        list = @()
    })
    $changed = $true
}

if ($null -eq (Get-JsonPropertyValue -Object $settings.profiles -Name list)) {
    $settings.profiles | Add-Member -NotePropertyName list -NotePropertyValue @()
    $changed = $true
}

$profiles = @($settings.profiles.list)
$powerShell7CandidateIndices = New-Object System.Collections.Generic.List[int]
$legacyPowerShellIndex = $null

for ($i = 0; $i -lt $profiles.Count; $i++) {
    $profile = $profiles[$i]
    $guid = [string](Get-JsonPropertyValue -Object $profile -Name guid)
    $source = [string](Get-JsonPropertyValue -Object $profile -Name source)
    $commandLine = [string](Get-JsonPropertyValue -Object $profile -Name commandline)

    if (Test-IsPowerShell7Profile -Profile $profile) {
        [void]$powerShell7CandidateIndices.Add($i)
    }

    if (
        $guid -eq $LegacyPowerShellGuid -or
        $commandLine -match '(?i)WindowsPowerShell\\v1\.0\\powershell\.exe'
    ) {
        $legacyPowerShellIndex = $i
    }

    if ($source -eq 'Windows.Terminal.Azure') {
        Set-JsonPropertyValue -Object $profile -Name hidden -Value $true
    }
}

$powerShell7Index = $null
foreach ($candidateIndex in $powerShell7CandidateIndices) {
    $candidate = $profiles[$candidateIndex]
    if ([string](Get-JsonPropertyValue -Object $candidate -Name source) -eq 'Windows.Terminal.PowershellCore') {
        $powerShell7Index = $candidateIndex
        break
    }
}

if ($null -eq $powerShell7Index -and $powerShell7CandidateIndices.Count -gt 0) {
    $powerShell7Index = $powerShell7CandidateIndices[0]
}

if ($null -eq $powerShell7Index) {
    $profiles += [pscustomobject]@{
        commandline = 'pwsh.exe'
        guid = $PowerShellGuid
        hidden = $false
        name = 'PowerShell 7'
        startingDirectory = '%USERPROFILE%'
    }
    $powerShell7Index = $profiles.Count - 1
    $changed = $true
}

$powerShell7Profile = $profiles[$powerShell7Index]
if ([string]::IsNullOrWhiteSpace([string](Get-JsonPropertyValue -Object $powerShell7Profile -Name guid))) {
    Set-JsonPropertyValue -Object $powerShell7Profile -Name guid -Value $PowerShellGuid
}
if ($null -eq (Get-JsonPropertyValue -Object $powerShell7Profile -Name commandline) -and [string](Get-JsonPropertyValue -Object $powerShell7Profile -Name source) -ne 'Windows.Terminal.PowershellCore') {
    Set-JsonPropertyValue -Object $powerShell7Profile -Name commandline -Value 'pwsh.exe'
}
Set-JsonPropertyValue -Object $powerShell7Profile -Name name -Value 'PowerShell 7'
Set-JsonPropertyValue -Object $powerShell7Profile -Name hidden -Value $false
Set-JsonPropertyValue -Object $powerShell7Profile -Name startingDirectory -Value '%USERPROFILE%'
Set-JsonPropertyValue -Object $settings -Name defaultProfile -Value ([string](Get-JsonPropertyValue -Object $powerShell7Profile -Name guid))

if ($null -ne $legacyPowerShellIndex) {
    $legacyPowerShellProfile = $profiles[$legacyPowerShellIndex]
    Set-JsonPropertyValue -Object $legacyPowerShellProfile -Name name -Value 'Windows PowerShell 5.1 (Legacy)'
    Set-JsonPropertyValue -Object $legacyPowerShellProfile -Name hidden -Value $false
}

$removedIndices = New-Object System.Collections.Generic.HashSet[int]
foreach ($candidateIndex in $powerShell7CandidateIndices) {
    if ($candidateIndex -eq $powerShell7Index) {
        continue
    }

    if (Test-IsDisposablePowerShell7Profile -Profile $profiles[$candidateIndex]) {
        if ($removedIndices.Add($candidateIndex)) {
            $changed = $true
        }
    }
}

$orderedProfiles = New-Object System.Collections.Generic.List[object]
$addedIndices = New-Object System.Collections.Generic.HashSet[int]

function Add-ProfileByIndex {
    param(
        [int]$Index
    )

    if ($Index -lt 0) {
        return
    }

    if ($removedIndices.Contains($Index)) {
        return
    }

    if ($addedIndices.Add($Index)) {
        $orderedProfiles.Add($profiles[$Index])
    }
}

Add-ProfileByIndex -Index $powerShell7Index
if ($null -ne $legacyPowerShellIndex) {
    Add-ProfileByIndex -Index $legacyPowerShellIndex
}

for ($i = 0; $i -lt $profiles.Count; $i++) {
    Add-ProfileByIndex -Index $i
}

$orderedProfilesArray = @($orderedProfiles.ToArray())
if ((ConvertTo-Json $profiles -Depth 100 -Compress) -ne (ConvertTo-Json $orderedProfilesArray -Depth 100 -Compress)) {
    $changed = $true
}
$settings.profiles.list = $orderedProfilesArray

if (-not $changed) {
    Write-Host 'Windows Terminal settings already match the managed baseline.'
    return
}

$backupPath = '{0}.bak-{1}' -f $settingsPath, (Get-Date -Format 'yyyyMMdd-HHmmss')
Copy-Item -LiteralPath $settingsPath -Destination $backupPath -Force
$settings | ConvertTo-Json -Depth 100 | Set-Content -LiteralPath $settingsPath -Encoding utf8BOM
Write-Host "Updated Windows Terminal settings: $settingsPath"
Write-Host "Backup saved to: $backupPath"