# Drive the game for automated tests: start it, click, press keys, take
# screenshots. Dot-source it:  . .\tools\game-input.ps1
#
#   Start-Sacred                      # launcher, returns the sacred.exe process
#   Click-At 1720 779                 # screen pixels (left click)
#   Press-Key 0x1B                    # virtual key (ESC)
#   Save-Screen screenshots\x.png     # primary monitor area of the game
#   Stop-Sacred $game                 # only the given process
#
# Input goes to the foreground window: don't touch mouse/keyboard meanwhile.

Add-Type -AssemblyName System.Drawing
Add-Type -Namespace SacredRe -Name Input -MemberDefinition @'
[DllImport("user32.dll")] public static extern bool SetCursorPos(int x, int y);
[DllImport("user32.dll")] public static extern void mouse_event(uint flags, uint dx, uint dy, uint data, System.UIntPtr extra);
[DllImport("user32.dll")] public static extern void keybd_event(byte vk, byte scan, uint flags, System.UIntPtr extra);
[DllImport("user32.dll")] public static extern bool SetForegroundWindow(System.IntPtr window);
'@

$script:Root = Split-Path $PSScriptRoot

# The game pauses its start-up until its window is active, and Windows does
# not hand the foreground to a window started from a background process; a
# synthetic Alt press lifts that restriction for SetForegroundWindow.
function Focus-Sacred($Game) {
    $Game.Refresh()
    if ($Game.MainWindowHandle -eq [IntPtr]::Zero) { return $false }
    [SacredRe.Input]::keybd_event(0x12, 0, 0, [UIntPtr]::Zero)
    [SacredRe.Input]::keybd_event(0x12, 0, 2, [UIntPtr]::Zero)
    [SacredRe.Input]::SetForegroundWindow($Game.MainWindowHandle)
}

function Start-Sacred([string]$Arguments = "log", [int]$WaitSeconds = 18) {
    if (Get-Process sacred -ErrorAction SilentlyContinue) { throw "sacred.exe is already running" }
    $null = Start-Process (Join-Path $script:Root "build\x86-debug\sacred_re.exe") -ArgumentList $Arguments
    $game = $null
    for ($i = 0; $i -lt $WaitSeconds * 4; $i++) {
        Start-Sleep -Milliseconds 250
        if (-not $game) { $game = Get-Process sacred -ErrorAction SilentlyContinue | Select-Object -First 1 }
        if ($game) { Focus-Sacred $game | Out-Null }
    }
    if (-not $game -or $game.HasExited) { throw "sacred.exe did not start (or crashed)" }
    $game
}

function Stop-Sacred($Game) {
    if ($Game -and -not $Game.HasExited) {
        Stop-Process -Id $Game.Id -Force
        $Game.WaitForExit(10000) | Out-Null
    }
}

function Click-At([int]$X, [int]$Y, [int]$AfterMs = 800) {
    [SacredRe.Input]::SetCursorPos($X, $Y) | Out-Null
    Start-Sleep -Milliseconds 150
    [SacredRe.Input]::mouse_event(0x0002, 0, 0, 0, [UIntPtr]::Zero)  # left down
    Start-Sleep -Milliseconds 80
    [SacredRe.Input]::mouse_event(0x0004, 0, 0, 0, [UIntPtr]::Zero)  # left up
    Start-Sleep -Milliseconds $AfterMs
}

function Press-Key([byte]$VirtualKey, [int]$AfterMs = 800) {
    [SacredRe.Input]::keybd_event($VirtualKey, 0, 0, [UIntPtr]::Zero)
    Start-Sleep -Milliseconds 80
    [SacredRe.Input]::keybd_event($VirtualKey, 0, 2, [UIntPtr]::Zero)  # key up
    Start-Sleep -Milliseconds $AfterMs
}

function Save-Screen([string]$Path, [int]$Width = 3440, [int]$Height = 1440) {
    $bitmap = New-Object System.Drawing.Bitmap $Width, $Height
    $graphics = [System.Drawing.Graphics]::FromImage($bitmap)
    $graphics.CopyFromScreen(0, 0, 0, 0, $bitmap.Size)
    $full = if ([IO.Path]::IsPathRooted($Path)) { $Path } else { Join-Path $script:Root $Path }
    $bitmap.Save($full)
    $graphics.Dispose(); $bitmap.Dispose()
    $full
}