function Get-GpfsConfiguration {
    [CmdletBinding()]
    param(
        [Parameter()]
        [string]$Path = (Join-Path $env:USERPROFILE '.PSGpfsApi\config.json'),

        [Parameter()]
        [string]$Profile
    )

    if (-not (Test-Path $Path)) {
        throw "Configuration file not found: $Path"
    }

    $config = Get-Content $Path -Raw | ConvertFrom-Json

    if ($Profile) {
        $profileObj = $config.Profiles.$Profile
        if (-not $profileObj) {
            throw "Profile '$Profile' not found in configuration."
        }
        return $profileObj
    }

    return $config
}

function Set-GpfsConfiguration {
    [CmdletBinding(SupportsShouldProcess)]
    param(
        [Parameter(Mandatory)]
        [string]$ProfileName,

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

        [Parameter()]
        [int]$Port = 443,

        [Parameter()]
        [ValidateSet('v2')]
        [string]$ApiVersion = 'v2',

        [Parameter()]
        [bool]$UseSsl = $true,

        [Parameter()]
        [bool]$SkipCertificateCheck = $false,

        [Parameter()]
        [int]$TimeoutSeconds = 30,

        [Parameter()]
        [string]$Username,

        [Parameter()]
        [string]$Path = (Join-Path $env:USERPROFILE '.PSGpfsApi\config.json'),

        [Parameter()]
        [switch]$SetActive
    )

    $dir = Split-Path $Path -Parent
    if (-not (Test-Path $dir)) {
        New-Item -ItemType Directory -Path $dir -Force | Out-Null
    }

    if (Test-Path $Path) {
        $config = Get-Content $Path -Raw | ConvertFrom-Json
    }
    else {
        $config = [PSCustomObject]@{
            Profiles      = [PSCustomObject]@{}
            ActiveProfile = 'default'
        }
    }

    $profileData = [PSCustomObject]@{
        Server               = $Server
        Port                 = $Port
        ApiVersion           = $ApiVersion
        UseSsl               = $UseSsl
        SkipCertificateCheck = $SkipCertificateCheck
        TimeoutSeconds       = $TimeoutSeconds
        Username             = $Username
    }

    $config.Profiles | Add-Member -NotePropertyName $ProfileName -NotePropertyValue $profileData -Force

    if ($SetActive) {
        $config.ActiveProfile = $ProfileName
    }

    if ($PSCmdlet.ShouldProcess($Path, 'Write configuration')) {
        $config | ConvertTo-Json -Depth 10 | Set-Content $Path -Encoding UTF8
        Write-Verbose "Configuration saved: $Path (profile: $ProfileName)"
    }
}

function Import-GpfsConfiguration {
    [CmdletBinding()]
    param(
        [Parameter()]
        [string]$Path = (Join-Path $env:USERPROFILE '.PSGpfsApi\config.json'),

        [Parameter()]
        [string]$Profile,

        [Parameter(Mandatory)]
        [PSCredential]$Credential,

        [Parameter()]
        [switch]$SkipCertificateCheck
    )

    if (-not (Test-Path $Path)) {
        throw "Configuration file not found: $Path"
    }

    $config = Get-Content $Path -Raw | ConvertFrom-Json
    $profileName = if ($Profile) { $Profile } else { $config.ActiveProfile }
    $profileObj  = $config.Profiles.$profileName

    if (-not $profileObj) {
        throw "Profile '$profileName' not found in configuration."
    }

    $connectParams = @{
        Server         = $profileObj.Server
        Port           = $profileObj.Port
        ApiVersion     = $profileObj.ApiVersion
        TimeoutSeconds = $profileObj.TimeoutSeconds
        Credential     = $Credential
    }

    if ($profileObj.UseSsl) {
        $connectParams['UseSsl'] = $true
    }

    if ($profileObj.SkipCertificateCheck -or $SkipCertificateCheck) {
        $connectParams['SkipCertificateCheck'] = $true
    }

    Connect-GpfsServer @connectParams
}

function Export-GpfsConfiguration {
    [CmdletBinding(SupportsShouldProcess)]
    param(
        [Parameter(Mandatory)]
        [string]$Path
    )

    $defaultPath = Join-Path $env:USERPROFILE '.PSGpfsApi\config.json'

    if (-not (Test-Path $defaultPath)) {
        throw "No configuration found at default path: $defaultPath"
    }

    if ($PSCmdlet.ShouldProcess($Path, 'Export configuration')) {
        Copy-Item -Path $defaultPath -Destination $Path -Force
        Write-Verbose "Configuration exported to: $Path"
    }
}

function New-GpfsConfigurationProfile {
    [CmdletBinding()]
    param(
        [Parameter(Mandatory)]
        [string]$Name,

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

        [Parameter()]
        [int]$Port = 443,

        [Parameter()]
        [string]$Username,

        [Parameter()]
        [bool]$SkipCertificateCheck = $false,

        [Parameter()]
        [switch]$SetActive
    )

    $setParams = @{
        ProfileName          = $Name
        Server               = $Server
        Port                 = $Port
        SkipCertificateCheck = $SkipCertificateCheck
        SetActive            = $SetActive
    }

    if ($Username) {
        $setParams['Username'] = $Username
    }

    Set-GpfsConfiguration @setParams
}

function Select-GpfsConfigurationProfile {
    [CmdletBinding(SupportsShouldProcess)]
    param(
        [Parameter(Mandatory, Position = 0)]
        [string]$Profile,

        [Parameter()]
        [string]$Path = (Join-Path $env:USERPROFILE '.PSGpfsApi\config.json')
    )

    if (-not (Test-Path $Path)) {
        throw "Configuration file not found: $Path"
    }

    $config = Get-Content $Path -Raw | ConvertFrom-Json

    if (-not $config.Profiles.$Profile) {
        throw "Profile '$Profile' not found in configuration."
    }

    if ($PSCmdlet.ShouldProcess($Profile, 'Set active profile')) {
        $config.ActiveProfile = $Profile
        $config | ConvertTo-Json -Depth 10 | Set-Content $Path -Encoding UTF8
        Write-Verbose "Active profile set to: $Profile"
    }
}