<#
.SYNOPSIS
    Scans a directory and its subdirectories to find duplicate files based on content.

.DESCRIPTION
    This script recursively searches through a specified directory, calculates the SHA256 hash
    for each file, and then groups files by their hash. It reports any groups of files
    that have identical hashes, as these are content-based duplicates.

.EXAMPLE
    .\Find-Duplicates.ps1
    (After setting the $targetDirectory variable inside the script)
#>

# --- CONFIGURATION ---
# Set the directory you want to scan for duplicates.
# IMPORTANT: Replace "C:\Path\To\Your\Directory" with the actual path.
$targetDirectory = "C:\Path\To\Your\Directory"

# --- SCRIPT ---

# Check if the target directory exists
if (-not (Test-Path -Path $targetDirectory -PathType Container)) {
    Write-Host "Error: The directory '$targetDirectory' does not exist." -ForegroundColor Red
    # Exit the script if the directory is not found
    return
}

Write-Host "Scanning for duplicate files in '$targetDirectory'..." -ForegroundColor Yellow
Write-Host "This may take a while for large directories..."

# 1. Get all files recursively from the target directory.
# 2. Calculate the SHA256 hash for each file.
# 3. Group the files by their calculated hash.
# 4. Filter the groups to find those with more than one file (i.e., duplicates).
$duplicateGroups = Get-ChildItem -Path $targetDirectory -Recurse -File | Get-FileHash -Algorithm SHA256 | Group-Object -Property Hash | Where-Object { $_.Count -gt 1 }

if ($duplicateGroups) {
    Write-Host "`nFound duplicate files:" -ForegroundColor Green
    
    # Loop through each group of duplicates and display the information
    $duplicateGroups | ForEach-Object {
        Write-Host "`n--------------------------------------------------"
        Write-Host "The following files are identical (Hash: $($_.Name)):" -ForegroundColor Cyan
        
        # List all files within the duplicate group
        $_.Group | ForEach-Object {
            Write-Host "  - $($_.Path)"
        }
    }
    Write-Host "`n--------------------------------------------------"
    Write-Host "Scan complete." -ForegroundColor Green
}
else {
    Write-Host "`nNo duplicate files found in '$targetDirectory'." -ForegroundColor Green
}