#Requires -RunAsAdministrator
$ErrorActionPreference = "Stop"

$Target = "C:\MinerOpsAgent"
$BackupRoot = Join-Path $Target "backups"
$Backup = Join-Path $BackupRoot (Get-Date -Format "yyyyMMdd-HHmmss")
$RuntimeFiles = @(
    "MinerOpsAgentService.ps1", "MinerOpsAgentTray.ps1", "MinerOpsAgentGUI.ps1",
    "MinerOpsApi3EnrichmentPoller.ps1", "MinerOpsPoolPoller.ps1",
    "MinerOpsPoolPollerTask.ps1", "EnrichOneMiner.ps1", "MinerOpsControl.ps1",
    "VERSION"
)

New-Item -ItemType Directory -Force -Path $Target, $BackupRoot | Out-Null
$existing = @($RuntimeFiles | Where-Object { Test-Path (Join-Path $Target $_) })
if ($existing.Count -gt 0) {
    New-Item -ItemType Directory -Force -Path $Backup | Out-Null
    foreach ($name in $existing) {
        Copy-Item (Join-Path $Target $name) (Join-Path $Backup $name) -Force
    }
}

try {
    foreach ($name in $RuntimeFiles) {
        $source = Join-Path $PSScriptRoot $name
        if (!(Test-Path $source)) { throw "Deployment source is missing $name" }
        Copy-Item $source (Join-Path $Target $name) -Force
    }

    $powerShell = "$env:SystemRoot\System32\WindowsPowerShell\v1.0\powershell.exe"
    $system = New-ScheduledTaskPrincipal -UserId "SYSTEM" -LogonType ServiceAccount -RunLevel Highest
    $startup = New-ScheduledTaskTrigger -AtStartup
    $fiveMinutes = New-ScheduledTaskTrigger -Once -At (Get-Date).AddMinutes(1) `
        -RepetitionInterval (New-TimeSpan -Minutes 5)

    $definitions = @(
        @{ Name = "MinerOpsAgent"; Script = "MinerOpsAgentService.ps1"; Trigger = $startup; Principal = $system },
        @{ Name = "MinerOpsAgentTray"; Script = "MinerOpsAgentTray.ps1"; Trigger = (New-ScheduledTaskTrigger -AtLogOn); Principal = $null },
        @{ Name = "MinerOpsApi3Enrichment"; Script = "MinerOpsApi3EnrichmentPoller.ps1"; Trigger = $fiveMinutes; Principal = $system },
        @{ Name = "MinerOpsPoolPoller"; Script = "MinerOpsPoolPollerTask.ps1"; Trigger = $fiveMinutes; Principal = $system }
    )
    foreach ($definition in $definitions) {
        $arguments = '-NoProfile -ExecutionPolicy Bypass -File "{0}"' -f `
            (Join-Path $Target $definition.Script)
        $action = New-ScheduledTaskAction -Execute $powerShell -Argument $arguments
        if ($definition.Principal) {
            Register-ScheduledTask -TaskName $definition.Name -Action $action `
                -Trigger $definition.Trigger -Principal $definition.Principal -Force | Out-Null
        } else {
            Register-ScheduledTask -TaskName $definition.Name -Action $action `
                -Trigger $definition.Trigger -Force | Out-Null
        }
    }
    Write-Host "MinerOps Windows Agent installed. Existing config, state, and logs were preserved."
} catch {
    if (Test-Path $Backup) {
        foreach ($name in $existing) {
            Copy-Item (Join-Path $Backup $name) (Join-Path $Target $name) -Force
        }
    }
    throw
}