#Requires -Version 5.1
# Pack existing backup scripts into a double-click exe. Does not change backup logic.
$ErrorActionPreference = "Stop"
$Root = Split-Path -Parent $MyInvocation.MyCommand.Path
Set-Location $Root

$cscCandidates = @(
    "$env:WINDIR\Microsoft.NET\Framework64\v4.0.30319\csc.exe",
    "$env:WINDIR\Microsoft.NET\Framework\v4.0.30319\csc.exe"
)
$csc = $cscCandidates | Where-Object { Test-Path $_ } | Select-Object -First 1
if (-not $csc) {
    throw "csc.exe not found (.NET Framework 4.x)."
}

$src = Join-Path $Root "MesDbBackup.cs"
if (-not (Test-Path $src)) { throw "MesDbBackup.cs not found" }

$readme = Get-ChildItem -Path $Root -Filter "*.txt" | Select-Object -First 1
if (-not $readme) { throw "readme txt not found" }

$required = @(
    "backup-ui-server.ps1",
    "backup-db.ps1",
    "db-config.ps1",
    "backup-ui.html",
    "restore-db.ps1",
    "install-backup-task.bat",
    $readme.Name
)
foreach ($f in $required) {
    if (-not (Test-Path (Join-Path $Root $f))) {
        throw "missing pack file: $f"
    }
}

# PS 5.1 parses no-BOM files as ANSI; add UTF-8 BOM to .ps1 so Chinese stays valid
$utf8Bom = New-Object System.Text.UTF8Encoding $true
$utf8NoBom = New-Object System.Text.UTF8Encoding $false
Get-ChildItem -Path $Root -Filter "*.ps1" | ForEach-Object {
    $raw = [System.IO.File]::ReadAllBytes($_.FullName)
    if ($raw.Length -ge 3 -and $raw[0] -eq 0xEF -and $raw[1] -eq 0xBB -and $raw[2] -eq 0xBF) { return }
    $text = [System.IO.File]::ReadAllText($_.FullName, $utf8NoBom)
    [System.IO.File]::WriteAllText($_.FullName, $text, $utf8Bom)
}

# csc misreads UTF-8 without BOM; write a BOM copy of the C# source
$tmpSrc = Join-Path $env:TEMP "MesDbBackup_build.cs"
$utf8Bom = New-Object System.Text.UTF8Encoding $true
[System.IO.File]::WriteAllText($tmpSrc, [System.IO.File]::ReadAllText($src, [System.Text.Encoding]::UTF8), $utf8Bom)

$outExe = Join-Path $Root "MesDbBackup.exe"
$fwDir = Split-Path $csc
$winforms = Join-Path $fwDir "System.Windows.Forms.dll"
$drawing = Join-Path $fwDir "System.Drawing.dll"

$resArgs = @()
foreach ($f in $required) {
    $resArgs += ('/resource:"{0}",{1}' -f (Join-Path $Root $f), $f)
}

$argList = @(
    "/nologo",
    "/target:winexe",
    "/optimize+",
    "/platform:anycpu",
    ('/out:"{0}"' -f $outExe),
    ('/reference:"{0}"' -f $winforms),
    ('/reference:"{0}"' -f $drawing)
) + $resArgs + @(('"{0}"' -f $tmpSrc))

Write-Host ("Compiling: {0}" -f $outExe)
$p = Start-Process -FilePath $csc -ArgumentList $argList -Wait -PassThru -NoNewWindow
if ($p.ExitCode -ne 0) {
    throw ("compile failed, exit {0}" -f $p.ExitCode)
}
Remove-Item $tmpSrc -Force -ErrorAction SilentlyContinue

if (-not (Test-Path $outExe)) {
    throw "exe not created"
}
$sizeKb = [math]::Round((Get-Item $outExe).Length / 1KB, 1)
Write-Host ("OK: {0} ({1} KB)" -f $outExe, $sizeKb)
Write-Host "Copy the exe to the server and double-click. Config is saved as db-config.json beside the exe."