$ErrorActionPreference = "Stop"
$LogFile = Join-Path $env:TEMP "xlight-upgrade.log"
$ActivationSubmitted = $false
trap {
    ($_ | Out-String) | Out-File $LogFile -Append -Encoding UTF8
    Write-Host ""
    Write-Host "XLight firmware upgrade was not completed." -ForegroundColor Red
    Write-Host "Reason: $($_.Exception.Message)" -ForegroundColor Yellow
    if ($ActivationSubmitted) {
        Write-Host "Activation status: the code was submitted. Contact support before retrying."
    } else {
        Write-Host "Activation status: the code was NOT submitted and can be used again."
    }
    Write-Host "Technical log: $LogFile"
    exit 1
}
$Server = "https://light.chuncui.icu/activation"
$WorkDir = Join-Path $env:TEMP ("xlight-upgrade-" + [guid]::NewGuid().ToString())
$Firmware = Join-Path $WorkDir "xlight-merged.bin"
$Venv = Join-Path $WorkDir "venv"

function Find-XLightPort([string]$RequestedPort) {
    if ($RequestedPort) { return $RequestedPort }
    $ports = Get-CimInstance Win32_SerialPort | Where-Object {
        $_.Name -match "ESP32|USB JTAG|USB Serial|Espressif" -or
        $_.PNPDeviceID -match "VID_303A"
    }
    if (@($ports).Count -ne 1) {
        throw "XLight COM port was not detected uniquely. Run this script with a port, for example: .\xlight-upgrade-windows.ps1 COM5"
    }
    return @($ports)[0].DeviceID
}

function Send-BridgeControl([string]$Control) {
    $Client = New-Object System.Net.Sockets.TcpClient
    try {
        $Client.Connect("127.0.0.1", 18266)
        $Stream = $Client.GetStream()
        $Payload = [Text.Encoding]::UTF8.GetBytes(
            (@{ control = $Control } | ConvertTo-Json -Compress)
        )
        $Stream.Write($Payload, 0, $Payload.Length)
        $Buffer = New-Object byte[] 64
        $Read = $Stream.Read($Buffer, 0, $Buffer.Length)
        return [Text.Encoding]::UTF8.GetString($Buffer, 0, $Read).Trim()
    } catch {
        return ""
    } finally {
        $Client.Close()
    }
}

function Stop-LegacyXLight {
    $Dest = Join-Path $HOME ".xlight"
    Get-CimInstance Win32_Process -ErrorAction SilentlyContinue |
        Where-Object { $_.CommandLine -and $_.CommandLine -like "*$Dest*" } |
        ForEach-Object {
            if ($_.ProcessId -ne $PID) {
                & cmd.exe /d /c "taskkill /PID $($_.ProcessId) /T /F >nul 2>&1"
            }
        }
    Start-Sleep -Seconds 2
}

function Start-XLightBridge {
    $Vbs = Join-Path $HOME ".xlight\bin\xlight-daemon.vbs"
    if (Test-Path $Vbs) {
        Start-Process "wscript.exe" -ArgumentList "`"$Vbs`"" -WindowStyle Hidden `
            -ErrorAction SilentlyContinue
    }
}

function Find-Python {
    $Candidates = @()
    foreach ($Name in @("python", "python3")) {
        $Command = Get-Command $Name -ErrorAction SilentlyContinue
        if ($Command) { $Candidates += ,@{ Command = $Command.Source; Args = @() } }
    }
    $Launcher = Get-Command py -ErrorAction SilentlyContinue
    if ($Launcher) {
        $Candidates = @(,@{ Command = $Launcher.Source; Args = @("-3") }) + $Candidates
    }
    foreach ($Pattern in @(
        "$env:LOCALAPPDATA\Programs\Python\Python*\python.exe",
        "$env:ProgramFiles\Python*\python.exe",
        "${env:ProgramFiles(x86)}\Python*\python.exe"
    )) {
        Get-Item $Pattern -ErrorAction SilentlyContinue | ForEach-Object {
            $Candidates += ,@{ Command = $_.FullName; Args = @() }
        }
    }
    foreach ($Candidate in $Candidates) {
        try {
            $Output = & $Candidate.Command @($Candidate.Args) -c `
                "import sys; print(sys.executable); raise SystemExit(0 if sys.version_info >= (3,9) else 1)" 2>$null
            if ($LASTEXITCODE -eq 0 -and $Output) { return $Candidate }
        } catch {}
    }
    return $null
}

$Python = Find-Python
if (-not $Python) {
    throw "Python 3.9 or newer was not found. Install it from https://www.python.org/downloads/windows/ and enable Add Python to PATH."
}

$Port = Find-XLightPort $args[0]
$BridgePaused = $false
$LegacyStopped = $false

do {
    $Code = (Read-Host "Enter activation code only (format: XL-XXXXX-XXXXX-XXXXX)").Trim().ToUpperInvariant()
    if ($Code -notmatch "^XL-[A-HJ-NP-Z2-9]{5}-[A-HJ-NP-Z2-9]{5}-[A-HJ-NP-Z2-9]{5}$") {
        Write-Warning "Invalid activation code format. Contact WeChat orz_8888888 for a code."
        $Code = ""
    }
} while (-not $Code)

try {
    New-Item -ItemType Directory -Force $WorkDir | Out-Null
    Write-Host "Python selected: $($Python.Command) $($Python.Args -join ' ')"
    Write-Host "[1/5] Creating a temporary Python environment..."
    & $Python.Command @($Python.Args) -m venv $Venv
    if ($LASTEXITCODE -ne 0) {
        throw "Could not create the Python virtual environment. Exit code: $LASTEXITCODE"
    }
    $ToolPython = Join-Path $Venv "Scripts\python.exe"
    if (-not (Test-Path $ToolPython)) {
        throw "The virtual environment was created without python.exe."
    }
    Write-Host "[2/5] Installing esptool..."
    & $ToolPython -m pip install --disable-pip-version-check --timeout 120 `
        --retries 5 --index-url "https://pypi.tuna.tsinghua.edu.cn/simple" `
        "esptool==5.3.0"
    if ($LASTEXITCODE -ne 0) {
        Write-Warning "The Tsinghua mirror failed. Retrying with the official Python package server..."
        & $ToolPython -m pip install --disable-pip-version-check --timeout 120 `
            --retries 5 "esptool==5.3.0"
    }
    if ($LASTEXITCODE -ne 0) {
        throw "esptool installation failed on both package servers. Switch to a stable internet connection and run the script again. Exit code: $LASTEXITCODE"
    }

    Write-Host "[3/5] Asking XLight to release serial port $Port..."
    $Reply = Send-BridgeControl "pause"
    if ($Reply -eq "PAUSED") {
        $BridgePaused = $true
    } else {
        Write-Warning "The installed XLight bridge is old. Stopping it for this upgrade..."
        Stop-LegacyXLight
        $LegacyStopped = $true
    }
    Start-Sleep -Seconds 1
    & $ToolPython -m esptool --chip esp32c3 --port $Port chip-id
    if ($LASTEXITCODE -ne 0) {
        throw "Serial port $Port is busy or unavailable. Close Arduino, serial monitors and other XLight windows, then run this script again. The activation code was NOT submitted."
    }

    $Body = @{ code = $Code; device_mac = $Port } | ConvertTo-Json
    Write-Host "[4/5] Validating the activation code and downloading firmware..."
    $Activation = Invoke-RestMethod -Method Post -Uri "$Server/activate" `
        -ContentType "application/json; charset=utf-8" -Body $Body
    $ActivationSubmitted = $true
    Invoke-WebRequest -Uri ($Server + $Activation.download_url) `
        -OutFile $Firmware -UseBasicParsing
    Write-Host "[5/5] Flashing XLight firmware to $Port..."
    & $ToolPython -m esptool --chip esp32c3 --port $Port --baud 921600 `
        write-flash 0x0 $Firmware
    if ($LASTEXITCODE -ne 0) {
        throw "Firmware flashing failed. Exit code: $LASTEXITCODE"
    }
    Write-Host ""
    Write-Host "Firmware upgrade completed successfully." -ForegroundColor Green
    Write-Host "Wait for XLight to restart. Do not unplug it during restart."
} finally {
    if ($BridgePaused) { [void](Send-BridgeControl "resume") }
    if ($LegacyStopped) { Start-XLightBridge }
    Remove-Item $WorkDir -Recurse -Force -ErrorAction SilentlyContinue
}