[CmdletBinding()]
param(
    [int]$Port = 8000,
    [string]$AvdName = "CognitiveAgent_Pixel_Tablet_API36",
    [switch]$Stop,
    [switch]$NoEmulator,
    [switch]$NoBrowser
)

$ErrorActionPreference = "Stop"
$repositoryRoot = (Resolve-Path (Join-Path $PSScriptRoot "..")).Path
$runtimeRoot = Join-Path $repositoryRoot "artifacts\server\android-pad"
$pidPath = Join-Path $runtimeRoot "server.json"

function Resolve-AndroidTool {
    param([Parameter(Mandatory = $true)][string]$RelativePath)
    $sdkCandidates = @(
        $env:ANDROID_SDK_ROOT,
        $env:ANDROID_HOME,
        "D:\Android\Sdk",
        (Join-Path $env:LOCALAPPDATA "Android\Sdk")
    ) | Where-Object { $_ }
    foreach ($sdkRoot in $sdkCandidates) {
        $candidate = Join-Path $sdkRoot $RelativePath
        if (Test-Path -LiteralPath $candidate -PathType Leaf) {
            return (Resolve-Path -LiteralPath $candidate).Path
        }
    }
    throw "Android SDK tool not found: $RelativePath"
}

function Read-ServerProcess {
    if (-not (Test-Path -LiteralPath $pidPath -PathType Leaf)) { return $null }
    try {
        $record = Get-Content -LiteralPath $pidPath -Raw | ConvertFrom-Json
        $processInfo = Get-CimInstance Win32_Process `
            -Filter "ProcessId = $([int]$record.pid)" `
            -ErrorAction SilentlyContinue
        if (-not $processInfo -or -not $processInfo.CommandLine.Contains("cognitive_agent.server")) {
            return $null
        }
        return Get-Process -Id ([int]$record.pid) -ErrorAction SilentlyContinue
    } catch {
        return $null
    }
}

$adb = Resolve-AndroidTool "platform-tools\adb.exe"

if ($Stop) {
    $serverProcess = Read-ServerProcess
    if ($serverProcess) {
        Stop-Process -Id $serverProcess.Id -Force
        Write-Host "Stopped Cognitive Agent server (PID $($serverProcess.Id))."
    }
    & $adb reverse --remove "tcp:$Port" 2>$null | Out-Null
    if (Test-Path -LiteralPath $pidPath -PathType Leaf) {
        Remove-Item -LiteralPath $pidPath -Force
    }
    exit 0
}

New-Item -ItemType Directory -Force -Path $runtimeRoot | Out-Null
$emulator = Resolve-AndroidTool "emulator\emulator.exe"

$device = (& $adb devices) |
    Select-String -Pattern '^(emulator-\d+)\s+device$' |
    Select-Object -First 1
if (-not $device -and -not $NoEmulator) {
    Write-Host "Starting Android tablet AVD: $AvdName"
    Start-Process -FilePath $emulator `
        -ArgumentList @("-avd", $AvdName, "-no-snapshot-save") `
        -WindowStyle Hidden | Out-Null
}

if (-not $NoEmulator) {
    & $adb wait-for-device
    $deadline = (Get-Date).AddMinutes(3)
    do {
        $bootCompleted = (& $adb shell getprop sys.boot_completed 2>$null).Trim()
        if ($bootCompleted -eq "1") { break }
        if ((Get-Date) -gt $deadline) { throw "Android emulator boot timed out." }
        Start-Sleep -Seconds 2
    } while ($true)
    & $adb reverse "tcp:$Port" "tcp:$Port"
}

$serverProcess = Read-ServerProcess
if (-not $serverProcess) {
    $python = Get-Command python -ErrorAction Stop
    $oldPythonPath = $env:PYTHONPATH
    $oldHardware = $env:COGNITIVE_AGENT_HARDWARE_EXECUTION_ENABLED
    $oldSimulation = $env:COGNITIVE_AGENT_SIMULATED_HARDWARE_ENABLED
    try {
        $env:PYTHONPATH = "$repositoryRoot\src;$repositoryRoot\domains\seat\src"
        $env:COGNITIVE_AGENT_HARDWARE_EXECUTION_ENABLED = "false"
        $env:COGNITIVE_AGENT_SIMULATED_HARDWARE_ENABLED = "true"
        $serverProcess = Start-Process -FilePath $python.Source `
            -ArgumentList @(
                "-m", "cognitive_agent.server",
                "--host", "127.0.0.1",
                "--port", "$Port"
            ) `
            -WorkingDirectory $repositoryRoot `
            -RedirectStandardOutput (Join-Path $runtimeRoot "stdout.log") `
            -RedirectStandardError (Join-Path $runtimeRoot "stderr.log") `
            -WindowStyle Hidden `
            -PassThru
    } finally {
        $env:PYTHONPATH = $oldPythonPath
        $env:COGNITIVE_AGENT_HARDWARE_EXECUTION_ENABLED = $oldHardware
        $env:COGNITIVE_AGENT_SIMULATED_HARDWARE_ENABLED = $oldSimulation
    }
    @{
        pid = $serverProcess.Id
        port = $Port
        started_at = (Get-Date).ToString("o")
    } | ConvertTo-Json | Set-Content -LiteralPath $pidPath -Encoding UTF8
    Write-Host "Started Cognitive Agent server (PID $($serverProcess.Id))."
}

$healthUrl = "http://127.0.0.1:$Port/api/health"
$deadline = (Get-Date).AddSeconds(45)
do {
    try {
        $health = Invoke-RestMethod -Uri $healthUrl -TimeoutSec 3
        if ($health.status -eq "ok") { break }
    } catch {
        if ($serverProcess.HasExited) {
            throw "Server exited during startup. See $runtimeRoot\stderr.log"
        }
    }
    if ((Get-Date) -gt $deadline) { throw "Server health check timed out: $healthUrl" }
    Start-Sleep -Milliseconds 750
} while ($true)

$padUrl = "http://127.0.0.1:$Port"
if (-not $NoEmulator -and -not $NoBrowser) {
    & $adb shell am start -a android.intent.action.VIEW -d $padUrl | Out-Null
}

Write-Host "Windows: $padUrl"
Write-Host "Android: $padUrl (adb reverse tcp:$Port tcp:$Port)"
Write-Host "Simulation: enabled; physical hardware execution: disabled"
Write-Host "Stop: .\tools\android_pad_dev.ps1 -Port $Port -Stop"