# GERP frontend deploy script: zero-downtime build and sync to production dir (TempLate/GERP)
#
# IMPORTANT: keep this file pure ASCII. PS 5.1 parses BOM-less UTF-8 files
# using the ANSI codepage, so non-ASCII text would be garbled.
#
# Order matters (zero downtime):
#   1. Build first (dist/) -- prod keeps serving the old build meanwhile
#   2. Copy new assets/dirs (additive) -- old index.html still points to old
#      assets, which are still present, so no request can 404
#   3. Swap index.html last -- every asset it references already exists
#   4. Prune stale files in the mirror dirs (assets / tinymce)
#   5. Verify prod matches dist
#
# Never delete index.html / assets before the new build is ready: SubdomainView
# (gvsds/apps/core/views.py) serves gerp.gvsds.com straight out of this directory.
#
# Usage:
#   Run:  .\deploy.ps1
#   (if execution policy blocks:  Set-ExecutionPolicy -Scope Process Bypass)

$ErrorActionPreference = 'Stop'

$ProjectRoot   = Split-Path -Parent $MyInvocation.MyCommand.Path
$DistDir       = Join-Path $ProjectRoot 'dist'
$ProdRoot      = Join-Path (Split-Path -Parent $ProjectRoot) 'TempLate\GERP'
$ProdAssetsDir = Join-Path $ProdRoot 'assets'
$IndexHtml     = Join-Path $ProdRoot 'index.html'

Write-Host "`n===== GERP DEPLOY START =====" -ForegroundColor Cyan
Write-Host "Project dir : $ProjectRoot"
Write-Host "Prod dir    : $ProdRoot"
Write-Host ''

# 1. Full build (vue-tsc type check + vite build). Non-destructive for prod.
Write-Host '[1/5] Running npm run build (type check + full build)...' -ForegroundColor Yellow
Push-Location $ProjectRoot
try {
    npm run build
    if ($LASTEXITCODE -ne 0) {
        throw "Build failed, exit code = $LASTEXITCODE"
    }
} finally {
    Pop-Location
}
Write-Host '  Build OK'
Write-Host ''

if (-not (Test-Path $ProdRoot)) {
    New-Item -ItemType Directory -Path $ProdRoot -Force | Out-Null
}

# 2. Copy new assets/dirs first (additive; stale files are pruned in step 4 so the
#    still-active old index.html never dangles)
Write-Host '[2/5] Syncing new assets to prod dir...' -ForegroundColor Yellow
Get-ChildItem -Path $DistDir -Force | Where-Object { $_.Name -ne 'index.html' } | ForEach-Object {
    Copy-Item -Recurse -Force $_.FullName $ProdRoot
    Write-Host "  synced: $($_.Name)"
}
Write-Host ''

# 3. Swap index.html last: at this point every asset it references already exists
Write-Host '[3/5] Swapping index.html...' -ForegroundColor Yellow
Copy-Item -Force (Join-Path $DistDir 'index.html') $IndexHtml
Write-Host '  index.html updated'
Write-Host ''

# 4. Prune stale files in the mirror dirs (assets / tinymce) that the new build no
#    longer ships. Only mirror dirs are touched -- prod-only dirs like pages/ are kept.
Write-Host '[4/5] Pruning stale files...' -ForegroundColor Yellow
function Remove-StaleFiles([string]$distDir, [string]$prodDir) {
    if (-not (Test-Path $prodDir)) { return }
    if (-not (Test-Path $distDir)) {
        # Whole dir is gone from the build: remove it from prod
        Remove-Item -Recurse -Force $prodDir
        Write-Host "  removed dir: $($prodDir.Substring($ProdRoot.Length))"
        return
    }
    $distNames = @(Get-ChildItem -Path $distDir -Recurse -File | ForEach-Object { $_.FullName.Substring($distDir.Length) })
    $stale = @(Get-ChildItem -Path $prodDir -Recurse -File | Where-Object {
        $_.FullName.Substring($prodDir.Length) -notin $distNames
    })
    foreach ($f in $stale) {
        Remove-Item -Force $f.FullName
        Write-Host "  removed: $($f.FullName.Substring($ProdRoot.Length))"
    }
    # Drop now-empty sub dirs (deepest first)
    Get-ChildItem -Path $prodDir -Recurse -Directory |
        Sort-Object { $_.FullName.Length } -Descending |
        Where-Object { -not (Get-ChildItem -Path $_.FullName -Force) } |
        ForEach-Object {
            Remove-Item -Force $_.FullName
            Write-Host "  removed empty dir: $($_.FullName.Substring($ProdRoot.Length))"
        }
}
Remove-StaleFiles (Join-Path $DistDir 'assets')  $ProdAssetsDir
Remove-StaleFiles (Join-Path $DistDir 'tinymce') (Join-Path $ProdRoot 'tinymce')
Write-Host ''

# 5. Verify prod dir matches dist (file name sets)
Write-Host '[5/5] Verifying artifact consistency...' -ForegroundColor Yellow
function Get-AssetNames([string]$dir) {
    if (-not (Test-Path $dir)) { return @() }
    return @(Get-ChildItem -Path $dir -Recurse -File | ForEach-Object { $_.FullName.Substring($dir.Length) })
}
$distNames = Get-AssetNames (Join-Path $DistDir 'assets')
$prodNames = Get-AssetNames $ProdAssetsDir
$distSet   = @($distNames | Sort-Object -Unique)
$prodSet   = @($prodNames | Sort-Object -Unique)

$onlyDist = @($distSet | Where-Object { $_ -notin $prodSet })
$onlyProd = @($prodSet | Where-Object { $_ -notin $distSet })

if ($onlyDist.Count -eq 0 -and $onlyProd.Count -eq 0) {
    Write-Host "  OK: $($distSet.Count) assets, prod matches dist exactly" -ForegroundColor Green
} else {
    Write-Host '  MISMATCH:' -ForegroundColor Red
    if ($onlyDist.Count) { Write-Host "    only in dist: $onlyDist" -ForegroundColor Red }
    if ($onlyProd.Count) { Write-Host "    only in prod: $onlyProd" -ForegroundColor Red }
    throw 'Artifact verification failed!'
}

# Verify the entry JS referenced by index.html exists
$indexContent = Get-Content $IndexHtml -Raw
$entryMatch = [regex]::Match($indexContent, 'src="([^"]+\.js)"')
if ($entryMatch.Success) {
    $entryPath = Join-Path $ProdRoot ($entryMatch.Groups[1].Value.TrimStart('/'))
    if (Test-Path $entryPath) {
        Write-Host "  entry JS OK: $($entryMatch.Groups[1].Value)" -ForegroundColor Green
    } else {
        throw "index.html entry JS not found: $entryPath"
    }
} else {
    throw 'No entry JS reference found in index.html'
}

Write-Host ''
Write-Host "===== GERP DEPLOY DONE =====" -ForegroundColor Cyan
Write-Host 'Please hard-refresh the browser (Ctrl+F5) to load the new build.' -ForegroundColor Cyan