# unpack_and_offline_build_airgap.ps1
# ============================================================================
# Execution Environment: OFFLINE (Air-gapped, No Internet)
# Purpose: Extract bundle and run offline build
# ============================================================================
# Windows PowerShell Only
# Version: 3.1
#
# IMPORTANT: This script automatically:
#   1. Extracts the archive
#   2. Sets GRADLE_USER_HOME to project local cache
#   3. Configures settings.gradle for offline resolution
#   4. Runs build with --offline flag
# ============================================================================

$ErrorActionPreference = "Stop"
$ProgressPreference = "SilentlyContinue"

# ============================================================================
# Configuration
# ============================================================================
$WRAPPER_SEED_PATH = "wrapper_jar_seed"
$OFFLINE_HOME_NAME = "_offline_gradle_home"

Write-Host ""
Write-Host "============================================================" -ForegroundColor Cyan
Write-Host " Gradle Offline Build Runner" -ForegroundColor Cyan
Write-Host " Environment: AIR-GAPPED (No Internet)" -ForegroundColor Cyan
Write-Host " Mode: Fully Offline (--offline enforced)" -ForegroundColor Cyan
Write-Host "============================================================" -ForegroundColor Cyan
Write-Host ""

# ============================================================================
# [1/16] Check Current Directory
# ============================================================================
Write-Host "==[1/16] Check Current Directory ==" -ForegroundColor Yellow
$Start = (Get-Location).Path
Write-Host ("PWD: " + $Start)
Write-Host ""

# ============================================================================
# [2/16] Select Archive
# ============================================================================
Write-Host "==[2/16] Select Archive ==" -ForegroundColor Yellow

$Archive = $null
if ($args.Count -ge 1) { 
    $Archive = $args[0].Trim().Trim('"').Trim("'")
}

if ([string]::IsNullOrWhiteSpace($Archive)) {
    $candidates = Get-ChildItem -Path $Start -File -ErrorAction SilentlyContinue | 
                  Where-Object { $_.Name -match "\.(tar\.gz|tgz)$" } |
                  Sort-Object LastWriteTime -Descending
    
    if (-not $candidates -or $candidates.Count -eq 0) {
        Write-Host "[ERROR] No archive found" -ForegroundColor Red
        Get-ChildItem -Path $Start -File | Format-Table Name, Length -AutoSize
        throw "ERROR: No .tar.gz file found"
    }
    
    $Archive = $candidates[0].FullName
    Write-Host ("[AUTO] " + (Split-Path $Archive -Leaf)) -ForegroundColor Cyan
} else {
    if (-not [System.IO.Path]::IsPathRooted($Archive)) { 
        $Archive = Join-Path $Start $Archive 
    }
    Write-Host ("[USER] " + (Split-Path $Archive -Leaf)) -ForegroundColor Cyan
}

if (-not (Test-Path -LiteralPath $Archive)) { 
    throw "ERROR: Archive not found: $Archive"
}

$archiveSizeMB = [math]::Round((Get-Item -LiteralPath $Archive).Length / 1MB, 2)
Write-Host ("Size: " + $archiveSizeMB + " MB")
Write-Host ""

# ============================================================================
# [3/16] Check tar.exe
# ============================================================================
Write-Host "==[3/16] Check tar.exe ==" -ForegroundColor Yellow

$tar = Get-Command tar.exe -ErrorAction SilentlyContinue
if (-not $tar) { throw "ERROR: tar.exe not found" }
Write-Host "[OK] tar.exe found" -ForegroundColor Green
Write-Host ""

# ============================================================================
# [4/16] Extract Archive
# ============================================================================
Write-Host "==[4/16] Extract Archive ==" -ForegroundColor Yellow
Write-Host "[INFO] Extracting..." -ForegroundColor Gray

& tar.exe -xzf $Archive -C $Start
if ($LASTEXITCODE -ne 0) { throw "ERROR: Extraction failed" }
Write-Host "[OK] Extracted" -ForegroundColor Green
Write-Host ""

# ============================================================================
# [5/16] Unblock Files
# ============================================================================
Write-Host "==[5/16] Unblock Files ==" -ForegroundColor Yellow

try {
    Get-ChildItem -Path $Start -Recurse -Force -ErrorAction SilentlyContinue | 
        Unblock-File -ErrorAction SilentlyContinue
    Write-Host "[OK] Files unblocked" -ForegroundColor Green
} catch {
    Write-Host "[WARN] Unblock failed" -ForegroundColor DarkYellow
}
Write-Host ""

# ============================================================================
# [6/16] Find Project Root
# ============================================================================
Write-Host "==[6/16] Find Project Root ==" -ForegroundColor Yellow

$gradlewList = Get-ChildItem -Path $Start -Recurse -Filter "gradlew.bat" -File -ErrorAction SilentlyContinue
if (-not $gradlewList) { throw "ERROR: gradlew.bat not found" }

$gradlew = $gradlewList | Sort-Object { $_.FullName.Length } | Select-Object -First 1
$ProjectDir = $gradlew.Directory.FullName

Write-Host ("Project: " + $ProjectDir) -ForegroundColor Cyan
Set-Location -LiteralPath $ProjectDir
Write-Host ""

# ============================================================================
# [7/16] Fix Permissions
# ============================================================================
Write-Host "==[7/16] Fix Permissions ==" -ForegroundColor Yellow

try {
    $currentUser = [System.Security.Principal.WindowsIdentity]::GetCurrent().Name
    cmd /c "icacls `"$ProjectDir`" /grant `"$currentUser`:(OI)(CI)F`" /t /q" 2>&1 | Out-Null
    Write-Host "[OK] Permissions fixed" -ForegroundColor Green
} catch {
    Write-Host "[WARN] icacls failed" -ForegroundColor DarkYellow
}
Write-Host ""

# ============================================================================
# [8/16] Verify Wrapper
# ============================================================================
Write-Host "==[8/16] Verify Wrapper ==" -ForegroundColor Yellow

$WrapperDir = Join-Path $ProjectDir "gradle\wrapper"
$WrapperJar = Join-Path $WrapperDir "gradle-wrapper.jar"
$WrapperProp = Join-Path $WrapperDir "gradle-wrapper.properties"

if (!(Test-Path -LiteralPath $WrapperProp)) {
    throw "ERROR: gradle-wrapper.properties missing"
}

if (!(Test-Path -LiteralPath $WrapperJar)) {
    $SeedJar = Join-Path $ProjectDir "$WRAPPER_SEED_PATH\gradle-wrapper.jar"
    if (Test-Path -LiteralPath $SeedJar) {
        New-Item -ItemType Directory -Force -Path $WrapperDir | Out-Null
        Copy-Item -Force -LiteralPath $SeedJar -Destination $WrapperJar
        Write-Host "[OK] Injected from seed" -ForegroundColor Green
    } else {
        throw "ERROR: wrapper jar missing"
    }
} else {
    Write-Host "[OK] Wrapper verified" -ForegroundColor Green
}
Write-Host ""

# ============================================================================
# [9/16] Set GRADLE_USER_HOME
# ============================================================================
Write-Host "==[9/16] Set GRADLE_USER_HOME ==" -ForegroundColor Yellow

$OfflineHome = Join-Path $ProjectDir $OFFLINE_HOME_NAME
if (!(Test-Path -LiteralPath $OfflineHome)) {
    throw "ERROR: _offline_gradle_home not found in archive"
}

$env:GRADLE_USER_HOME = $OfflineHome
Write-Host ("GRADLE_USER_HOME = " + $env:GRADLE_USER_HOME) -ForegroundColor Cyan

# Check cache
$CachesDir = Join-Path $OfflineHome "caches"
if (Test-Path -LiteralPath $CachesDir) {
    $cacheSize = (Get-ChildItem -Path $CachesDir -Recurse -File -ErrorAction SilentlyContinue | 
                  Measure-Object -Property Length -Sum).Sum
    $cacheSizeMB = [math]::Round($cacheSize / 1MB, 2)
    Write-Host ("[INFO] Cache size: " + $cacheSizeMB + " MB") -ForegroundColor Cyan
} else {
    Write-Host "[WARN] No cache folder found" -ForegroundColor DarkYellow
}
Write-Host ""

# ============================================================================
# [10/16] Verify settings.gradle
# ============================================================================
Write-Host "==[10/16] Verify settings.gradle ==" -ForegroundColor Yellow

$settingsFile = $null
if (Test-Path -LiteralPath ".\settings.gradle") { $settingsFile = "settings.gradle" }
elseif (Test-Path -LiteralPath ".\settings.gradle.kts") { $settingsFile = "settings.gradle.kts" }

if ($settingsFile) {
    $content = Get-Content -LiteralPath ".\$settingsFile" -Raw
    if ($content -match "mavenLocal\(\)" -and $content -match "pluginManagement") {
        Write-Host "[OK] settings.gradle configured for offline" -ForegroundColor Green
    } else {
        Write-Host "[WARN] settings.gradle may not be configured for offline" -ForegroundColor DarkYellow
        Write-Host "[INFO] Build may fail if plugins not cached" -ForegroundColor Gray
    }
}
Write-Host ""

# ============================================================================
# [11/16] Test Gradle
# ============================================================================
Write-Host "==[11/16] Test Gradle ==" -ForegroundColor Yellow

$gradleWorks = $false
try {
    $output = cmd /c ".\gradlew.bat --offline --version 2>&1"
    if ($LASTEXITCODE -eq 0) {
        $gradleWorks = $true
        Write-Host "[OK] Gradle working in offline mode" -ForegroundColor Green
    }
} catch { }

if (-not $gradleWorks) {
    Write-Host "[WARN] Gradle --version failed" -ForegroundColor DarkYellow
}
Write-Host ""

# ============================================================================
# [12/16] Stop Daemon
# ============================================================================
Write-Host "==[12/16] Stop Daemon ==" -ForegroundColor Yellow

try { cmd /c ".\gradlew.bat --stop 2>&1" | Out-Null } catch { }
Start-Sleep -Seconds 2
Write-Host "[OK] Daemon stopped" -ForegroundColor Green
Write-Host ""

# ============================================================================
# [13/16] Run Offline Build
# ============================================================================
Write-Host "==[13/16] Run Offline Build ==" -ForegroundColor Yellow
Write-Host ""
Write-Host "============================================================" -ForegroundColor Cyan
Write-Host " Building with --offline flag" -ForegroundColor Cyan
Write-Host " All dependencies from local cache" -ForegroundColor Cyan
Write-Host "============================================================" -ForegroundColor Cyan
Write-Host ""

$buildSuccess = $false
$buildTask = $null

# Try bootJar
Write-Host "[TRY] --offline bootJar..." -ForegroundColor Gray
try {
    cmd /c ".\gradlew.bat --offline clean bootJar --no-daemon"
    if ($LASTEXITCODE -eq 0) {
        $buildSuccess = $true
        $buildTask = "bootJar"
    }
} catch { }

# Try jar
if (-not $buildSuccess) {
    Write-Host "[TRY] --offline jar..." -ForegroundColor Gray
    try {
        cmd /c ".\gradlew.bat --offline clean jar --no-daemon"
        if ($LASTEXITCODE -eq 0) {
            $buildSuccess = $true
            $buildTask = "jar"
        }
    } catch { }
}

# Try build
if (-not $buildSuccess) {
    Write-Host "[TRY] --offline build..." -ForegroundColor Gray
    try {
        cmd /c ".\gradlew.bat --offline build --no-daemon"
        if ($LASTEXITCODE -eq 0) {
            $buildSuccess = $true
            $buildTask = "build"
        }
    } catch { }
}

Write-Host ""
if ($buildSuccess) {
    Write-Host "============================================================" -ForegroundColor Green
    Write-Host (" BUILD SUCCESS! (task: " + $buildTask + ")") -ForegroundColor Green
    Write-Host "============================================================" -ForegroundColor Green
} else {
    Write-Host "============================================================" -ForegroundColor Red
    Write-Host " BUILD FAILED!" -ForegroundColor Red
    Write-Host "============================================================" -ForegroundColor Red
    Write-Host ""
    Write-Host "Possible causes:" -ForegroundColor Yellow
    Write-Host "  - Dependencies not in cache" -ForegroundColor White
    Write-Host "  - Plugin resolution failed" -ForegroundColor White
    Write-Host "  - Need complete build in online env first" -ForegroundColor White
    throw "Build failed"
}
Write-Host ""

# ============================================================================
# [14/16] Show Build Output
# ============================================================================
Write-Host "==[14/16] Build Output ==" -ForegroundColor Yellow

$libsDir = Join-Path $ProjectDir "build\libs"
if (Test-Path -LiteralPath $libsDir) {
    Write-Host "build/libs contents:" -ForegroundColor Cyan
    Get-ChildItem -LiteralPath $libsDir | 
        Format-Table Name, @{L="Size(KB)";E={[math]::Round($_.Length/1KB,1)}} -AutoSize | 
        Out-Host
    
    $mainJar = Get-ChildItem -LiteralPath $libsDir -Filter "*.jar" | 
               Where-Object { $_.Name -notmatch "plain|sources|javadoc" } | 
               Select-Object -First 1
} else {
    Write-Host "[WARN] build/libs not found" -ForegroundColor DarkYellow
}
Write-Host ""

# ============================================================================
# [15/16] Run Instructions
# ============================================================================
Write-Host "==[15/16] Run Instructions ==" -ForegroundColor Yellow
Write-Host ""

if ($mainJar) {
    Write-Host "To run the application:" -ForegroundColor Cyan
    Write-Host ("  java -jar build\libs\" + $mainJar.Name) -ForegroundColor White
    Write-Host ""
}

Write-Host "To rebuild:" -ForegroundColor Cyan
Write-Host '  $env:GRADLE_USER_HOME = ".\\_offline_gradle_home"' -ForegroundColor White
Write-Host "  .\gradlew.bat --offline bootJar --no-daemon" -ForegroundColor White
Write-Host ""

# ============================================================================
# [16/16] Complete
# ============================================================================
Write-Host "============================================================" -ForegroundColor Green
Write-Host " Offline Build Complete!" -ForegroundColor Green
Write-Host "============================================================" -ForegroundColor Green
Write-Host ""
Write-Host ("Project: " + $ProjectDir) -ForegroundColor Cyan
Write-Host ""