# EU-Utility V3 - Dependency Checker for Windows
# Run this in PowerShell to verify all build prerequisites

param(
    [switch]$InstallMissing
)

$ErrorActionPreference = "Stop"
$hasErrors = $false

Write-Host "`n=== EU-Utility V3 Build Dependency Checker ===`n" -ForegroundColor Cyan

# 1. Check Node.js
Write-Host "Checking Node.js..." -NoNewline
$nodeVersion = & node --version 2>$null
if ($nodeVersion) {
    Write-Host " OK ($nodeVersion)" -ForegroundColor Green
} else {
    Write-Host " MISSING" -ForegroundColor Red
    Write-Host "  Install from: https://nodejs.org/" -ForegroundColor Yellow
    $hasErrors = $true
}

# 2. Check npm
Write-Host "Checking npm..." -NoNewline
$npmVersion = & npm --version 2>$null
if ($npmVersion) {
    Write-Host " OK ($npmVersion)" -ForegroundColor Green
} else {
    Write-Host " MISSING" -ForegroundColor Red
    $hasErrors = $true
}

# 3. Check Rust/Cargo
Write-Host "Checking Rust..." -NoNewline
$cargoVersion = & cargo --version 2>$null
if ($cargoVersion) {
    Write-Host " OK ($cargoVersion)" -ForegroundColor Green
} else {
    Write-Host " MISSING" -ForegroundColor Red
    Write-Host "  Install from: https://rustup.rs/" -ForegroundColor Yellow
    $hasErrors = $true
}

# 4. Check Tauri CLI
Write-Host "Checking Tauri CLI..." -NoNewline
$tauriVersion = & npx tauri --version 2>$null
if ($tauriVersion) {
    Write-Host " OK ($tauriVersion)" -ForegroundColor Green
} else {
    Write-Host " MISSING" -ForegroundColor Red
    Write-Host "  Install with: npm install -g @tauri-apps/cli@^1.5.0" -ForegroundColor Yellow
    $hasErrors = $true
}

# 5. Check Visual Studio Build Tools
Write-Host "Checking Visual Studio Build Tools..." -NoNewline
$clPath = Get-Command cl.exe -ErrorAction SilentlyContinue
$vcvarsPath = "${env:ProgramFiles(x86)}\Microsoft Visual Studio\2022\BuildTools\VC\Auxiliary\Build\vcvars64.bat"
$vsPath = "${env:ProgramFiles(x86)}\Microsoft Visual Studio\2022\BuildTools"

if ($clPath -or (Test-Path $vcvarsPath) -or (Test-Path $vsPath)) {
    Write-Host " OK" -ForegroundColor Green
} else {
    Write-Host " MISSING" -ForegroundColor Red
    Write-Host "  Download from: https://visualstudio.microsoft.com/downloads/#build-tools-for-visual-studio-2022" -ForegroundColor Yellow
    Write-Host "  Select: 'Desktop development with C++' workload" -ForegroundColor Yellow
    $hasErrors = $true
}

# 6. Check vcpkg
Write-Host "Checking vcpkg..." -NoNewline
$vcpkgPath = "C:\vcpkg\vcpkg.exe"
$vcpkgExists = Test-Path $vcpkgPath

if ($vcpkgExists) {
    Write-Host " OK" -ForegroundColor Green
} else {
    Write-Host " MISSING" -ForegroundColor Red
    Write-Host "  Install with:" -ForegroundColor Yellow
    Write-Host "    git clone https://github.com/Microsoft/vcpkg.git C:\vcpkg" -ForegroundColor Cyan
    Write-Host "    C:\vcpkg\bootstrap-vcpkg.bat" -ForegroundColor Cyan
    $hasErrors = $true
}

# 7. Check vcpkg static libraries
if ($vcpkgExists) {
    Write-Host "`nChecking vcpkg static libraries..." -ForegroundColor White
    
    $requiredLibs = @(
        "tesseract:x64-windows-static-md",
        "leptonica:x64-windows-static-md",
        "libpng:x64-windows-static-md",
        "tiff:x64-windows-static-md",
        "libjpeg-turbo:x64-windows-static-md",
        "openjpeg:x64-windows-static-md"
    )
    
    $installedLibs = & C:\vcpkg\vcpkg list 2>$null
    
    foreach ($lib in $requiredLibs) {
        $libName = $lib.Split(':')[0]
        Write-Host "  Checking $libName..." -NoNewline
        
        if ($installedLibs -match $libName) {
            Write-Host " OK" -ForegroundColor Green
        } else {
            Write-Host " MISSING" -ForegroundColor Red
            if ($InstallMissing) {
                Write-Host "  Installing $lib..." -ForegroundColor Yellow
                & C:\vcpkg\vcpkg install $lib
            } else {
                Write-Host "  Install with: C:\vcpkg\vcpkg install $lib" -ForegroundColor Cyan
            }
            $hasErrors = $true
        }
    }
}

# 8. Check environment variables
Write-Host "`nChecking environment variables..." -ForegroundColor White

$envVars = @(
    @{ Name = "VCPKG_ROOT"; Expected = "C:\vcpkg" }
)

foreach ($var in $envVars) {
    $name = $var.Name
    $expected = $var.Expected
    $value = [Environment]::GetEnvironmentVariable($name, "User")
    
    Write-Host "  Checking $name..." -NoNewline
    
    if ($value -eq $expected) {
        Write-Host " OK" -ForegroundColor Green
    } else {
        Write-Host " MISSING or INCORRECT" -ForegroundColor Red
        Write-Host "  Set with: [Environment]::SetEnvironmentVariable('$name', '$expected', 'User')" -ForegroundColor Cyan
        $hasErrors = $true
    }
}

# 9. Check npm dependencies
Write-Host "`nChecking npm dependencies..." -NoNewline
Set-Location $PSScriptRoot\..
$nodeModulesExists = Test-Path "node_modules"
if ($nodeModulesExists) {
    Write-Host " OK (node_modules exists)" -ForegroundColor Green
} else {
    Write-Host " MISSING" -ForegroundColor Red
    Write-Host "  Install with: npm install" -ForegroundColor Cyan
    $hasErrors = $true
}

# Summary
Write-Host "`n=== Summary ===" -ForegroundColor Cyan
if ($hasErrors) {
    Write-Host "Some dependencies are missing. Fix the issues above and run again." -ForegroundColor Red
    Write-Host "`nTo install missing vcpkg libraries automatically, run:" -ForegroundColor Yellow
    Write-Host "  .\scripts\check-dependencies.ps1 -InstallMissing" -ForegroundColor Cyan
    exit 1
} else {
    Write-Host "All dependencies are installed! You can now build with:" -ForegroundColor Green
    Write-Host "  npm run tauri-build" -ForegroundColor Cyan
    exit 0
}