# Mr. Mags one-click installer engine.
#
# Downloads the desktop installer and the browser extension from cdn.mrmags.org,
# installs the desktop app silently to the per-user location (no admin needed),
# extracts the extension to a known stable path, and opens the keyholder's
# browser to chrome://extensions/ with the path copied to their clipboard so
# they only have to click Developer mode + Load unpacked + paste + Open.
#
# Invoked by Mr-Mags-Quick-Install.cmd via PowerShell -EncodedCommand.

$ErrorActionPreference = 'Stop'
$ProgressPreference    = 'SilentlyContinue'

# ── Constants ─────────────────────────────────────────────────────────────
$CdnBase        = 'https://cdn.mrmags.org'
$DesktopFile    = 'Mr-Mags-Setup.exe'
$ExtensionFile  = 'mrmags-extension.zip'
$ExtensionDir   = Join-Path $env:LOCALAPPDATA 'MrMagsExtension'
$TempDir        = Join-Path $env:TEMP ("mrmags-install-{0}" -f (Get-Random -Maximum 99999))

# ── Helpers ───────────────────────────────────────────────────────────────
function Write-Banner {
    $bar = ('=' * 60)
    Write-Host ''
    Write-Host $bar -ForegroundColor DarkCyan
    Write-Host '  Mr. Mags  ::  one-click install' -ForegroundColor White
    Write-Host '  Desktop app + browser extension. About 60 seconds.' -ForegroundColor Gray
    Write-Host $bar -ForegroundColor DarkCyan
    Write-Host ''
}

function Write-Step([string]$msg) {
    Write-Host "  -> $msg" -ForegroundColor Cyan
}

function Write-Done([string]$msg) {
    Write-Host "     $msg" -ForegroundColor Green
}

function Write-Soft([string]$msg) {
    Write-Host "     $msg" -ForegroundColor DarkGray
}

function Fetch-File([string]$url, [string]$dest, [string]$label) {
    Write-Step "Downloading $label"
    try {
        # IWR with -UseBasicParsing avoids IE engine dependency on older Win.
        Invoke-WebRequest -Uri $url -OutFile $dest -UseBasicParsing
    } catch {
        throw "Download failed for $label : $($_.Exception.Message)"
    }
    if (-not (Test-Path $dest)) {
        throw "Download finished but file missing: $dest"
    }
    $size = [math]::Round((Get-Item $dest).Length / 1MB, 1)
    Write-Done "$label downloaded ($size MB)"
}

function Find-Browser {
    # Prefer Chrome; fall back to Edge. Both honor chrome://extensions style
    # URLs for their own extension UIs (edge://extensions for Edge).
    $candidates = @(
        @{ name='Chrome'; ext='chrome://extensions/';
           paths=@(
               (Join-Path $env:LOCALAPPDATA 'Google\Chrome\Application\chrome.exe'),
               'C:\Program Files\Google\Chrome\Application\chrome.exe',
               'C:\Program Files (x86)\Google\Chrome\Application\chrome.exe'
           )
        },
        @{ name='Edge'; ext='edge://extensions/';
           paths=@(
               'C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe',
               'C:\Program Files\Microsoft\Edge\Application\msedge.exe'
           )
        }
    )
    foreach ($c in $candidates) {
        foreach ($p in $c.paths) {
            if (Test-Path $p) {
                return [pscustomobject]@{ Name=$c.name; Path=$p; Url=$c.ext }
            }
        }
    }
    return $null
}

# ── Main flow ─────────────────────────────────────────────────────────────
try {
    Write-Banner

    New-Item -ItemType Directory -Path $TempDir -Force | Out-Null
    Write-Soft "Working folder: $TempDir"

    # Step 1: download installer + extension in parallel-ish (sequential is fine)
    $desktopPath = Join-Path $TempDir $DesktopFile
    Fetch-File "$CdnBase/$DesktopFile" $desktopPath 'desktop installer (~180 MB)'

    $extPath = Join-Path $TempDir $ExtensionFile
    Fetch-File "$CdnBase/$ExtensionFile" $extPath 'browser extension (~30 KB)'

    # Step 2: run the desktop installer silently. NSIS /S = silent install.
    # Per-user install (no admin), default location LOCALAPPDATA\Programs\mrmags-app.
    Write-Step 'Installing desktop app (silent, no admin required)'
    $p = Start-Process -FilePath $desktopPath -ArgumentList '/S' -PassThru -Wait
    if ($p.ExitCode -ne 0) {
        throw "Desktop installer exited with code $($p.ExitCode)"
    }
    Write-Done 'Desktop app installed'

    # Step 3: extract extension to a STABLE path the keyholder can paste into
    # Chrome. Purge old contents first so a re-install picks up the new
    # manifest.json instead of mixing versions.
    Write-Step 'Setting up browser extension files'
    if (Test-Path $ExtensionDir) {
        Remove-Item -Path $ExtensionDir -Recurse -Force
    }
    New-Item -ItemType Directory -Path $ExtensionDir -Force | Out-Null
    Expand-Archive -Path $extPath -DestinationPath $ExtensionDir -Force
    if (-not (Test-Path (Join-Path $ExtensionDir 'manifest.json'))) {
        # The zip may have a top-level folder; promote its contents.
        $inner = Get-ChildItem -Path $ExtensionDir -Directory | Select-Object -First 1
        if ($inner) {
            Get-ChildItem -Path $inner.FullName -Force | Move-Item -Destination $ExtensionDir -Force
            Remove-Item -Path $inner.FullName -Recurse -Force
        }
    }
    if (-not (Test-Path (Join-Path $ExtensionDir 'manifest.json'))) {
        throw "Extension extracted but manifest.json not found at $ExtensionDir"
    }
    Write-Done "Extension files at: $ExtensionDir"

    # Step 4: copy the path to clipboard so the user only has to paste.
    try {
        Set-Clipboard -Value $ExtensionDir
        Write-Done 'Extension path copied to clipboard'
    } catch {
        Write-Soft "(Could not copy to clipboard automatically; the path will be shown for you to copy manually.)"
    }

    # Step 5: launch browser to extensions page.
    $browser = Find-Browser
    if ($browser) {
        Write-Step "Opening $($browser.Name) to the extensions page"
        Start-Process -FilePath $browser.Path -ArgumentList $browser.Url | Out-Null
        Write-Done "$($browser.Name) opened to $($browser.Url)"
    } else {
        Write-Soft "No supported browser found. Open Chrome or Edge and go to chrome://extensions yourself."
    }

    # Step 6: friendly finish screen with the manual step + path on screen.
    $bar = ('=' * 60)
    Write-Host ''
    Write-Host $bar -ForegroundColor Green
    Write-Host '  Almost done! One small step in your browser:' -ForegroundColor White
    Write-Host $bar -ForegroundColor Green
    Write-Host ''
    Write-Host '   1. Toggle ' -NoNewline; Write-Host 'Developer mode' -ForegroundColor Yellow -NoNewline; Write-Host ' (top-right of the extensions page).'
    Write-Host '   2. Click ' -NoNewline; Write-Host 'Load unpacked' -ForegroundColor Yellow -NoNewline; Write-Host '.'
    Write-Host '   3. Paste this path into the folder picker:' -NoNewline; Write-Host ''
    Write-Host ''
    Write-Host "      $ExtensionDir" -ForegroundColor Cyan
    Write-Host ''
    Write-Host '      (The path is already in your clipboard. Ctrl+V in the picker.)' -ForegroundColor DarkGray
    Write-Host ''
    Write-Host '   4. Click ' -NoNewline; Write-Host 'Select Folder' -ForegroundColor Yellow -NoNewline; Write-Host '. Mr. Mags appears in your extension list.'
    Write-Host '   5. Pin it to your toolbar (puzzle icon -> pin).'
    Write-Host ''
    Write-Host $bar -ForegroundColor Green
    Write-Host '   Desktop app is already installed. It will open from your Start menu' -ForegroundColor Gray
    Write-Host '   or system tray. Memory lives at: %APPDATA%\Mr. Mags' -ForegroundColor Gray
    Write-Host '   Questions: hello@mrmags.org' -ForegroundColor Gray
    Write-Host $bar -ForegroundColor Green
    Write-Host ''
    Write-Host 'Press any key to close this window...' -ForegroundColor DarkGray
    $null = $Host.UI.RawUI.ReadKey('NoEcho,IncludeKeyDown')

    exit 0
}
catch {
    Write-Host ''
    Write-Host '  Install failed:' -ForegroundColor Red
    Write-Host "    $($_.Exception.Message)" -ForegroundColor Red
    Write-Host ''
    Write-Host '  Try the manual install at https://mrmags.org/install' -ForegroundColor Yellow
    Write-Host '  or email hello@mrmags.org for help.' -ForegroundColor Yellow
    Write-Host ''
    Write-Host 'Press any key to close this window...' -ForegroundColor DarkGray
    $null = $Host.UI.RawUI.ReadKey('NoEcho,IncludeKeyDown')
    exit 1
}
finally {
    if (Test-Path $TempDir) {
        try { Remove-Item -Path $TempDir -Recurse -Force -ErrorAction SilentlyContinue } catch {}
    }
}