# Git Credential Setup for Windows 11
# Comprehensive setup script for managing Git credentials

Write-Host ""
Write-Host "🔐 Git Credential Setup for Windows 11" -ForegroundColor Cyan
Write-Host "====================================" -ForegroundColor Cyan
Write-Host ""

# Check if Git is installed
try {
    $gitVersion = git --version 2>$null
    Write-Host "✅ Git found: $gitVersion" -ForegroundColor Green
} catch {
    Write-Host "❌ Error: Git is not installed" -ForegroundColor Red
    Write-Host ""
    Write-Host "Please install Git for Windows:" -ForegroundColor Yellow
    Write-Host "Download: https://gitforwindows.org/" -ForegroundColor White
    Write-Host "Or via winget: winget install --id Git.Git -e --source winget" -ForegroundColor White
    Read-Host "Press Enter to exit"
    exit 1
}

# Check current Git config
Write-Host "📋 Current Git Configuration:" -ForegroundColor Magenta
Write-Host "User Name: $(git config --global user.name)" -ForegroundColor White
Write-Host "User Email: $(git config --global user.email)" -ForegroundColor White
Write-Host "Credential Helper: $(git config --global credential.helper)" -ForegroundColor White
Write-Host ""

# Check if we're in a Git repository
if (Test-Path ".git") {
    Write-Host "📁 Current Repository:" -ForegroundColor Magenta
    $remoteUrl = git remote get-url origin 2>$null
    Write-Host "Remote URL: $remoteUrl" -ForegroundColor White
    Write-Host ""
}

Write-Host "🔧 Available Git Credential Methods:" -ForegroundColor Yellow
Write-Host "1. Git Credential Manager (Recommended)" -ForegroundColor White
Write-Host "2. GitHub CLI (for GitHub/GitLab)" -ForegroundColor White
Write-Host "3. SSH Keys (Most Secure)" -ForegroundColor White
Write-Host "4. Personal Access Token" -ForegroundColor White
Write-Host "5. VS Code Integration" -ForegroundColor White
Write-Host ""

$choice = Read-Host "Choose your preferred method (1-5)"

switch ($choice) {
    "1" {
        Write-Host ""
        Write-Host "🔑 Setting up Git Credential Manager (GCM)..." -ForegroundColor Green
        Write-Host ""

        # Check if GCM is installed
        $gcmInstalled = $false
        try {
            $gcmVersion = git-credential-manager --version 2>$null
            $gcmInstalled = $true
            Write-Host "✅ Git Credential Manager found: $gcmVersion" -ForegroundColor Green
        } catch {
            Write-Host "⚠️  Git Credential Manager not found" -ForegroundColor Yellow
        }

        if (-not $gcmInstalled) {
            Write-Host ""
            Write-Host "Installing Git Credential Manager..." -ForegroundColor Yellow

            # Try winget first
            try {
                Write-Host "Trying winget..." -ForegroundColor Gray
                winget install --id GitHub.GitHubDesktop -e --source winget --silent
                Write-Host "✅ GitHub Desktop (includes GCM) installed" -ForegroundColor Green
            } catch {
                Write-Host "Winget failed, trying manual download..." -ForegroundColor Yellow

                # Manual download
                $gcmUrl = "https://github.com/git-ecosystem/git-credential-manager/releases/latest/download/gcm-win-x86-64.exe"
                $installerPath = "$env:TEMP\gcm-installer.exe"

                Write-Host "Downloading GCM installer..." -ForegroundColor Gray
                Invoke-WebRequest -Uri $gcmUrl -OutFile $installerPath

                Write-Host "Installing GCM..." -ForegroundColor Gray
                Start-Process -FilePath $installerPath -ArgumentList "/VERYSILENT /NORESTART" -Wait

                Remove-Item $installerPath -Force
                Write-Host "✅ Git Credential Manager installed" -ForegroundColor Green
            }
        }

        # Configure Git to use GCM
        Write-Host ""
        Write-Host "Configuring Git to use GCM..." -ForegroundColor Yellow
        git config --global credential.helper manager

        Write-Host "✅ GCM configured as credential helper" -ForegroundColor Green
        Write-Host ""
        Write-Host "Next time you push/pull, GCM will:" -ForegroundColor Cyan
        Write-Host "1. Open a browser for authentication" -ForegroundColor White
        Write-Host "2. Store credentials securely" -ForegroundColor White
        Write-Host "3. Handle token refresh automatically" -ForegroundColor White
    }

    "2" {
        Write-Host ""
        Write-Host "🐙 Setting up GitHub CLI..." -ForegroundColor Green
        Write-Host ""

        # Check if GitHub CLI is installed
        $ghInstalled = $false
        try {
            $ghVersion = gh --version 2>$null | Select-Object -First 1
            $ghInstalled = $true
            Write-Host "✅ GitHub CLI found: $ghVersion" -ForegroundColor Green
        } catch {
            Write-Host "⚠️  GitHub CLI not found" -ForegroundColor Yellow
        }

        if (-not $ghInstalled) {
            Write-Host ""
            Write-Host "Installing GitHub CLI..." -ForegroundColor Yellow
            try {
                winget install --id GitHub.cli -e --source winget
                Write-Host "✅ GitHub CLI installed" -ForegroundColor Green
            } catch {
                Write-Host "Please install GitHub CLI manually:" -ForegroundColor Yellow
                Write-Host "Download: https://cli.github.com/" -ForegroundColor White
                Read-Host "Press Enter after installation"
            }
        }

        # Authenticate with GitHub
        Write-Host ""
        Write-Host "Authenticating with GitHub..." -ForegroundColor Yellow
        gh auth login

        # Configure Git to use GitHub CLI
        Write-Host ""
        Write-Host "Configuring Git to use GitHub CLI..." -ForegroundColor Yellow
        git config --global credential.helper gh

        Write-Host "✅ GitHub CLI configured as credential helper" -ForegroundColor Green
    }

    "3" {
        Write-Host ""
        Write-Host "🔐 Setting up SSH Keys (Most Secure)..." -ForegroundColor Green
        Write-Host ""

        $sshKeyPath = "$env:USERPROFILE\.ssh\id_ed25519"
        $sshKeyExists = Test-Path $sshKeyPath

        if ($sshKeyExists) {
            Write-Host "✅ SSH key already exists at: $sshKeyPath" -ForegroundColor Green
        } else {
            Write-Host "Generating new SSH key..." -ForegroundColor Yellow
            ssh-keygen -t ed25519 -C "$(git config --global user.email)" -f $sshKeyPath -N '""'

            Write-Host "✅ SSH key generated" -ForegroundColor Green
        }

        Write-Host ""
        Write-Host "📋 SSH Public Key (add this to your Git server):" -ForegroundColor Yellow
        Write-Host "----------------------------------------" -ForegroundColor Gray
        Get-Content "$sshKeyPath.pub"
        Write-Host "----------------------------------------" -ForegroundColor Gray

        Write-Host ""
        Write-Host "Next steps:" -ForegroundColor Cyan
        Write-Host "1. Copy the public key above" -ForegroundColor White
        Write-Host "2. Add it to your Git server (git.d-popov.com)" -ForegroundColor White
        Write-Host "3. Test SSH connection: ssh -T git@git.d-popov.com" -ForegroundColor White

        # Change remote URL to SSH
        $currentRemote = git remote get-url origin 2>$null
        if ($currentRemote -and $currentRemote.StartsWith("https://")) {
            Write-Host ""
            $useSSH = Read-Host "Change remote URL to SSH? (y/n)"
            if ($useSSH -eq "y") {
                $sshUrl = $currentRemote -replace "https://git\.d-popov\.com/", "git@git.d-popov.com:"
                $sshUrl = $sshUrl -replace "\.git$", ".git"
                git remote set-url origin $sshUrl
                Write-Host "✅ Remote URL changed to SSH: $sshUrl" -ForegroundColor Green
            }
        }
    }

    "4" {
        Write-Host ""
        Write-Host "🔑 Setting up Personal Access Token..." -ForegroundColor Green
        Write-Host ""

        Write-Host "For git.d-popov.com, you'll need to:" -ForegroundColor Yellow
        Write-Host "1. Go to your Git server web interface" -ForegroundColor White
        Write-Host "2. Generate a Personal Access Token" -ForegroundColor White
        Write-Host "3. Use your username + token as password" -ForegroundColor White
        Write-Host ""

        # Configure Git to store credentials
        git config --global credential.helper store

        Write-Host "✅ Git configured to store credentials" -ForegroundColor Green
        Write-Host ""
        Write-Host "Next time you push/pull:" -ForegroundColor Cyan
        Write-Host "- Username: $(git config --global user.name)" -ForegroundColor White
        Write-Host "- Password: [your personal access token]" -ForegroundColor White
        Write-Host "- Git will remember these credentials" -ForegroundColor White
    }

    "5" {
        Write-Host ""
        Write-Host "💻 Setting up VS Code Git Integration..." -ForegroundColor Green
        Write-Host ""

        Write-Host "VS Code has built-in Git credential management:" -ForegroundColor Yellow
        Write-Host "1. VS Code stores credentials securely" -ForegroundColor White
        Write-Host "2. No additional setup needed" -ForegroundColor White
        Write-Host "3. Credentials are managed per-repository" -ForegroundColor White
        Write-Host ""

        # Configure VS Code as credential helper
        git config --global credential.helper vscode

        Write-Host "✅ VS Code configured as credential helper" -ForegroundColor Green
        Write-Host ""
        Write-Host "Next time you use Git in VS Code:" -ForegroundColor Cyan
        Write-Host "- VS Code will prompt for credentials" -ForegroundColor White
        Write-Host "- Choose 'Save' to store them" -ForegroundColor White
        Write-Host "- Credentials are stored securely" -ForegroundColor White
    }

    default {
        Write-Host "❌ Invalid choice. Please run the script again." -ForegroundColor Red
        exit 1
    }
}

Write-Host ""
Write-Host "🎉 Git credential setup complete!" -ForegroundColor Green
Write-Host ""
Write-Host "📖 Additional Resources:" -ForegroundColor Magenta
Write-Host "- Git Documentation: https://git-scm.com/doc" -ForegroundColor White
Write-Host "- GCM Documentation: https://aka.ms/gcm" -ForegroundColor White
Write-Host "- SSH Key Guide: https://docs.github.com/en/authentication/connecting-to-github-with-ssh" -ForegroundColor White
Write-Host ""

Write-Host "🧪 Test your setup:" -ForegroundColor Yellow
Write-Host "git fetch" -ForegroundColor White
Write-Host "git pull" -ForegroundColor White
Write-Host "git push" -ForegroundColor White
Write-Host ""

Read-Host "Press Enter to continue"