#!/usr/bin/env pwsh
<#
.SYNOPSIS
Oneshot Git Workshop installer - Downloads and runs the prerequisites installation.

.DESCRIPTION
This script downloads the Git Workshop repository and runs the prerequisites
installation script. It's designed to be run directly from the web:

    irm https://git.frod.dk/floppydiscen/git-workshop/raw/branch/main/install.ps1 | iex

The script will:
1. Create a temporary working directory
2. Download the Git Workshop repository
3. Run the install-prerequisites.ps1 script
4. Clean up temporary files

.EXAMPLE
PS> irm https://git.frod.dk/floppydiscen/git-workshop/raw/branch/main/install.ps1 | iex
Downloads and runs the Git Workshop installer.

.NOTES
Requires Windows 11 with PowerShell and internet access.
#>

[CmdletBinding()]
param()

Set-StrictMode -Version Latest
$ErrorActionPreference = 'Stop'

#region Helper Functions

function Write-ColorMessage {
    param(
        [string]$Message,
        [string]$Color = 'White'
    )
    Write-Host $Message -ForegroundColor $Color
}

function Write-Step {
    param([string]$Message)
    Write-ColorMessage "`n=== $Message ===" -Color Cyan
}

function Write-Success {
    param([string]$Message)
    Write-ColorMessage "  ✓ $Message" -Color Green
}

function Write-Warning {
    param([string]$Message)
    Write-ColorMessage "  ⚠ $Message" -Color Yellow
}

function Write-Error {
    param([string]$Message)
    Write-ColorMessage "  ✗ $Message" -Color Red
}

#endregion

#region Main Script

Write-Host @"
╔═══════════════════════════════════════════════════════════╗
║                                                           ║
║   Git Workshop - Oneshot Installation Script             ║
║                                                           ║
╚═══════════════════════════════════════════════════════════╝

"@ -ForegroundColor Cyan

Write-Host "This script will download and install all prerequisites for the Git Workshop." -ForegroundColor White
Write-Host ""

# Check PowerShell version
Write-Step "Checking PowerShell Version"
$psVersion = $PSVersionTable.PSVersion
Write-Success "PowerShell $psVersion"

if ($psVersion.Major -lt 7) {
    Write-Warning "PowerShell 7+ is recommended for best compatibility"
    Write-Host "  Continuing with PowerShell $($psVersion.Major)..." -ForegroundColor Gray
}

# Create temporary working directory
Write-Step "Creating Working Directory"
$tempDir = Join-Path $env:TEMP "git-workshop-$(Get-Date -Format 'yyyyMMdd-HHmmss')"

try {
    New-Item -Path $tempDir -ItemType Directory -Force | Out-Null
    Write-Success "Created temporary directory: $tempDir"
}
catch {
    Write-Error "Failed to create temporary directory: $_"
    exit 1
}

# Download the repository
Write-Step "Downloading Git Workshop Repository"

$repoUrl = "https://git.frod.dk/floppydiscen/git-workshop/archive/main.zip"
$zipPath = Join-Path $tempDir "git-workshop.zip"

try {
    Write-Host "  Downloading from: $repoUrl" -ForegroundColor Gray
    Invoke-WebRequest -Uri $repoUrl -OutFile $zipPath -UseBasicParsing
    Write-Success "Repository downloaded successfully"
}
catch {
    Write-Error "Failed to download repository: $_"
    Write-Host ""
    Write-Host "Troubleshooting:" -ForegroundColor Yellow
    Write-Host "  • Check your internet connection" -ForegroundColor White
    Write-Host "  • Verify the repository URL is correct" -ForegroundColor White
    Write-Host "  • Try running the script again" -ForegroundColor White
    exit 1
}

# Extract the repository
Write-Step "Extracting Repository"

try {
    Write-Host "  Extracting to: $tempDir" -ForegroundColor Gray
    Expand-Archive -Path $zipPath -DestinationPath $tempDir -Force
    
    # Find the extracted directory (should be git-workshop-main)
    $extractedDir = Get-ChildItem -Path $tempDir -Directory | Where-Object { $_.Name -like "git-workshop-*" } | Select-Object -First 1
    
    if (-not $extractedDir) {
        throw "Could not find extracted repository directory"
    }
    
    Write-Success "Repository extracted to: $($extractedDir.FullName)"
}
catch {
    Write-Error "Failed to extract repository: $_"
    exit 1
}

# Run the prerequisites installer
Write-Step "Running Prerequisites Installation"

$installerScript = Join-Path $extractedDir.FullName "install-prerequisites.ps1"

if (-not (Test-Path $installerScript)) {
    Write-Error "Installation script not found: $installerScript"
    Write-Host ""
    Write-Host "Expected file structure:" -ForegroundColor Yellow
    Write-Host "  git-workshop-main/" -ForegroundColor White
    Write-Host "  ├── install-prerequisites.ps1" -ForegroundColor White
    Write-Host "  ├── README.md" -ForegroundColor White
    Write-Host "  └── ..." -ForegroundColor White
    exit 1
}

try {
    Write-Host "  Running: $installerScript" -ForegroundColor Gray
    Write-Host ""
    
    # Change to the extracted directory and run the installer
    Push-Location $extractedDir.FullName
    & $installerScript
    
    $installerExitCode = $LASTEXITCODE
    Pop-Location
    
    if ($installerExitCode -eq 0) {
        Write-Success "Prerequisites installation completed successfully!"
    }
    else {
        Write-Warning "Prerequisites installation completed with warnings (exit code: $installerExitCode)"
    }
}
catch {
    Write-Error "Failed to run prerequisites installer: $_"
    exit 1
}
finally {
    if (Get-Location -ErrorAction SilentlyContinue) {
        Pop-Location -ErrorAction SilentlyContinue
    }
}

# Clean up
Write-Step "Cleaning Up"

try {
    Write-Host "  Removing temporary directory: $tempDir" -ForegroundColor Gray
    Remove-Item -Path $tempDir -Recurse -Force
    Write-Success "Temporary files cleaned up"
}
catch {
    Write-Warning "Failed to clean up temporary files: $_"
    Write-Host "  You can manually delete: $tempDir" -ForegroundColor Yellow
}

# Final instructions
Write-Step "Installation Complete"

Write-Host ""
Write-Success "Git Workshop installation is complete!"
Write-Host ""

Write-Host "Next steps:" -ForegroundColor Cyan
Write-Host "  1. Clone or download the Git Workshop repository" -ForegroundColor White
Write-Host "  2. Configure Git if you haven't already:" -ForegroundColor White
Write-Host "     git config --global user.name `"Your Name`"" -ForegroundColor Gray
Write-Host "     git config --global user.email `"your.email@example.com`"" -ForegroundColor Gray
Write-Host "  3. Start with the first module:" -ForegroundColor White
Write-Host "     cd 01-essentials\01-basics" -ForegroundColor Gray
Write-Host "     .\setup.ps1" -ForegroundColor Gray
Write-Host ""

Write-Host "For help and documentation:" -ForegroundColor Cyan
Write-Host "  • README.md - Workshop overview" -ForegroundColor White
Write-Host "  • GIT-CHEATSHEET.md - Git command reference" -ForegroundColor White
Write-Host "  • AGENDA.md - Workshop schedule (Danish)" -ForegroundColor White
Write-Host ""

Write-Host "Enjoy learning Git!" -ForegroundColor Green

#endregion

exit 0