#requires -Version 5.1
#requires -RunAsAdministrator
<#
.SYNOPSIS
    Source-side transfer: backup IIS state + robocopy snolla site to RUVDS.

.DESCRIPTION
    Run on source (DESKTOP-NSEF0UK / windows-recovery-host) in PowerShell as Administrator.

    Steps:
      1. Probe RUVDS SMB 445 reachability (fail fast).
      2. Pull RUVDS Administrator password from pass-store.
      3. Backup IIS state to C:\Users\vitya\iis-backup-pre-ruvds\:
            - applicationHost.config
            - appcmd dump of all sites (for reference)
            - appcmd dump of snolla site config + apppool (for recreate on RUVDS)
      4. net-use mount \\80.64.31.36\sites with creds.
      5. Copy IIS backup files into the share (so RUVDS can grab them for recreate).
      6. robocopy C:\sites\snolla -> \\80.64.31.36\sites\snolla
         (/Z resume-on-disconnect, /MT:8 parallel, /R:2 /W:5 retries, /XJ skip junctions)
      7. Verify count + size match.
      8. Disconnect SMB.

    Transcript: C:\Users\vitya\iis-backup-pre-ruvds\transfer-log.txt
#>

[CmdletBinding()]
param(
    [string]$RuvdsIp = '80.64.31.36',
    [string]$ShareName = 'sites',
    [string]$SiteName = 'snolla',
    [string]$SourceSite = 'C:\sites\snolla',
    [string]$BackupDir = 'C:\Users\vitya\iis-backup-pre-ruvds'
)

$ErrorActionPreference = 'Stop'
$ProgressPreference = 'SilentlyContinue'

if (-not (Test-Path $BackupDir)) { New-Item -ItemType Directory -Path $BackupDir -Force | Out-Null }
Start-Transcript -Path (Join-Path $BackupDir 'transfer-log.txt') -Append -Force | Out-Null

function Step($name) { Write-Host "`n=== $name ===" -ForegroundColor Cyan }
function Ok($msg)    { Write-Host "  [OK]   $msg" -ForegroundColor Green }
function Skip($msg)  { Write-Host "  [SKIP] $msg" -ForegroundColor Yellow }
function Fail($msg)  { Write-Host "  [FAIL] $msg" -ForegroundColor Red }

$shareUnc = "\\$RuvdsIp\$ShareName"
$mountedShare = $false

try {

    Step '1. Probe RUVDS SMB 445'
    $smb = Test-NetConnection -ComputerName $RuvdsIp -Port 445 -InformationLevel Quiet -WarningAction SilentlyContinue
    if (-not $smb) { throw "RUVDS:445 not reachable. Re-run 01-ruvds-bootstrap.ps1 on RUVDS." }
    Ok "RUVDS:445 reachable"

    Step '2. Pull RUVDS password from pass-store'
    $bash = 'C:\Program Files\Git\bin\bash.exe'
    if (-not (Test-Path $bash)) { throw "bash.exe not found at $bash; pass-store unreachable" }
    $passOut = & $bash -lc 'pass show ruvds-iis/full-env'
    $passLine = $passOut | Where-Object { $_ -match '^RUVDS_IIS_PASS=' } | Select-Object -First 1
    if (-not $passLine) { throw "RUVDS_IIS_PASS not found in pass show ruvds-iis/full-env" }
    $ruvdsPass = $passLine -replace '^RUVDS_IIS_PASS=',''
    Ok "credentials loaded from pass-store"

    Step '3. Backup source IIS state'
    $appcmd = "$env:SystemRoot\system32\inetsrv\appcmd.exe"
    if (-not (Test-Path $appcmd)) { throw "appcmd.exe not found -- IIS Management Tools not installed on source?" }

    Copy-Item 'C:\Windows\System32\inetsrv\config\applicationHost.config' (Join-Path $BackupDir 'applicationHost.config') -Force
    Ok "applicationHost.config backed up"

    & $appcmd list site /config:* /xml | Out-File -FilePath (Join-Path $BackupDir 'all-sites.xml') -Encoding UTF8
    Ok "appcmd list site (all) dumped"

    & $appcmd list site /name:$SiteName /config:* /xml | Out-File -FilePath (Join-Path $BackupDir 'snolla-site.xml') -Encoding UTF8
    Ok "snolla-site.xml dumped"

    & $appcmd list apppool /xml | Out-File -FilePath (Join-Path $BackupDir 'all-apppools.xml') -Encoding UTF8
    Ok "all-apppools.xml dumped"

    Step '4. Mount RUVDS share'
    cmd.exe /c "net use $shareUnc /user:Administrator $ruvdsPass" 2>&1 | Out-Null
    if ($LASTEXITCODE -ne 0) {
        cmd.exe /c "net use $shareUnc /delete /y" 2>&1 | Out-Null
        cmd.exe /c "net use $shareUnc /user:Administrator $ruvdsPass" 2>&1 | Tee-Object -Variable mountOut | Out-Null
        if ($LASTEXITCODE -ne 0) { throw "net use failed: $mountOut" }
    }
    $mountedShare = $true
    Ok "mounted $shareUnc"

    Step '5. Copy IIS backup files to share (for RUVDS recreate-script access)'
    $remoteBackupDir = Join-Path $shareUnc '_iis-backup'
    if (-not (Test-Path $remoteBackupDir)) { New-Item -ItemType Directory -Path $remoteBackupDir -Force | Out-Null }
    Copy-Item (Join-Path $BackupDir '*.xml') $remoteBackupDir -Force
    Copy-Item (Join-Path $BackupDir 'applicationHost.config') $remoteBackupDir -Force
    Ok "IIS backup files copied to $remoteBackupDir"

    Step '6. robocopy snolla site'
    $srcDir = $SourceSite
    $dstDir = Join-Path $shareUnc $SiteName
    if (-not (Test-Path $srcDir)) { throw "source $srcDir not found" }

    $srcSizeGB = [math]::Round(((Get-ChildItem $srcDir -Recurse -File -ErrorAction SilentlyContinue | Measure-Object -Property Length -Sum).Sum / 1GB), 2)
    Write-Host "  Source size: $srcSizeGB GB"
    Write-Host "  Destination: $dstDir"
    Write-Host "  This may take 30-90 min on home uplink. Progress goes to log."
    Write-Host ""

    $robocopyLog = Join-Path $BackupDir 'robocopy-snolla.log'
    $robocopyArgs = @(
        $srcDir, $dstDir,
        '*.*',
        '/S', '/E',
        '/DCOPY:DA', '/COPY:DAT',
        '/Z',
        '/MT:8',
        '/R:2', '/W:5',
        '/XJ',
        '/TEE',
        "/LOG+:$robocopyLog",
        '/NP', '/NDL'
    )
    $rcStart = Get-Date
    & robocopy.exe @robocopyArgs
    $rcExit = $LASTEXITCODE
    $rcDuration = (Get-Date) - $rcStart

    # robocopy exit codes: 0-7 = success/partial, 8+ = error
    if ($rcExit -ge 8) {
        throw "robocopy failed with exit $rcExit. See $robocopyLog tail."
    }
    Ok ("robocopy done in {0:hh\:mm\:ss} (exit={1})" -f $rcDuration, $rcExit)

    Step '7. Verify count + size'
    $srcCount = (Get-ChildItem $srcDir -Recurse -File -ErrorAction SilentlyContinue | Measure-Object).Count
    $dstCount = (Get-ChildItem $dstDir -Recurse -File -ErrorAction SilentlyContinue | Measure-Object).Count
    $srcBytes = (Get-ChildItem $srcDir -Recurse -File -ErrorAction SilentlyContinue | Measure-Object -Property Length -Sum).Sum
    $dstBytes = (Get-ChildItem $dstDir -Recurse -File -ErrorAction SilentlyContinue | Measure-Object -Property Length -Sum).Sum
    Write-Host "  Source: $srcCount files, $([math]::Round($srcBytes / 1MB, 0)) MB"
    Write-Host "  Dest:   $dstCount files, $([math]::Round($dstBytes / 1MB, 0)) MB"
    if ($srcCount -ne $dstCount) { Fail "FILE COUNT MISMATCH ($srcCount vs $dstCount)"; throw "count mismatch" }
    if ($srcBytes -ne $dstBytes) { Fail "SIZE MISMATCH ($srcBytes vs $dstBytes bytes)"; throw "size mismatch" }
    Ok "count + size match"

    Step '8. Summary'
    Write-Host ""
    Write-Host "  Source site:       $srcDir"
    Write-Host "  RUVDS dest:        $dstDir"
    Write-Host "  Files transferred: $dstCount"
    Write-Host "  Bytes transferred: $([math]::Round($dstBytes / 1GB, 2)) GB"
    Write-Host "  Duration:          $('{0:hh\:mm\:ss}' -f $rcDuration)"
    Write-Host "  IIS backup local:  $BackupDir"
    Write-Host "  IIS backup remote: $remoteBackupDir (on RUVDS as C:\sites\_iis-backup\)"
    Write-Host ""
    Write-Host "  Transcript: $(Join-Path $BackupDir 'transfer-log.txt')" -ForegroundColor DarkGray
    Write-Host "  Robocopy log: $robocopyLog" -ForegroundColor DarkGray
    Write-Host ""
    Write-Host "  Next: run 03-ruvds-recreate-sites.ps1 on RUVDS." -ForegroundColor Cyan

} catch {
    Fail $_.Exception.Message
    Write-Host $_.ScriptStackTrace -ForegroundColor DarkRed
    exit 1
} finally {
    if ($mountedShare) {
        cmd.exe /c "net use $shareUnc /delete /y" 2>&1 | Out-Null
        Write-Host "`n  [cleanup] SMB share dismounted" -ForegroundColor DarkGray
    }
    Stop-Transcript | Out-Null
}