param(
    [int]$Port = 8010,
    [int]$ReadyTimeoutSeconds = 60
)

$ErrorActionPreference = "Stop"
$projectRoot = (Resolve-Path (Join-Path $PSScriptRoot "..")).Path
$runtimeRoot = Join-Path $projectRoot ".runtime"
$logRoot = Join-Path $projectRoot "logs\runtime"
New-Item -ItemType Directory -Force -Path $runtimeRoot, $logRoot | Out-Null

function Get-OwnedRuntimeProcess {
    param([string]$PidFile)

    if (-not (Test-Path -LiteralPath $PidFile)) {
        return $null
    }
    $parts = (Get-Content -LiteralPath $PidFile -Raw).Trim().Split("|")
    if ($parts.Count -ne 2) {
        return $null
    }
    $processId = 0
    $startTicks = 0L
    if (
        -not [int]::TryParse($parts[0], [ref]$processId) -or
        -not [long]::TryParse($parts[1], [ref]$startTicks)
    ) {
        return $null
    }
    $process = Get-Process -Id $processId -ErrorAction SilentlyContinue
    if (
        $null -eq $process -or
        $process.StartTime.ToUniversalTime().Ticks -ne $startTicks
    ) {
        return $null
    }
    return $process
}

$pidFiles = @{
    Api = Join-Path $runtimeRoot "api.pid"
    FeishuEvents = Join-Path $runtimeRoot "feishu-events.pid"
}
foreach ($entry in $pidFiles.GetEnumerator()) {
    if ($null -ne (Get-OwnedRuntimeProcess -PidFile $entry.Value)) {
        throw "$($entry.Key) is already running. Stop it before starting another instance."
    }
    if (Test-Path -LiteralPath $entry.Value) {
        Remove-Item -LiteralPath $entry.Value -Force
    }
}

$pythonOutput = & conda run -n company-ai-platform python -c "import sys; print(sys.executable)"
if ($LASTEXITCODE -ne 0) {
    throw "Unable to locate Python in the company-ai-platform Conda environment."
}
$pythonExe = (
    $pythonOutput |
        Where-Object { -not [string]::IsNullOrWhiteSpace($_) } |
        Select-Object -Last 1
)
if (-not [string]::IsNullOrWhiteSpace($pythonExe)) {
    $pythonExe = $pythonExe.Trim()
}
if (
    [string]::IsNullOrWhiteSpace($pythonExe) -or
    -not (Test-Path -LiteralPath $pythonExe)
) {
    $condaEnvironmentOutput = & conda env list --json
    if ($LASTEXITCODE -ne 0) {
        throw "Unable to list Conda environments."
    }
    $condaEnvironmentList = (
        ($condaEnvironmentOutput -join [Environment]::NewLine) |
            ConvertFrom-Json
    )
    $matchingEnvironmentRoots = @(
        $condaEnvironmentList.envs |
            Where-Object {
                (Split-Path -Leaf $_) -eq "company-ai-platform"
            }
    )
    if ($matchingEnvironmentRoots.Count -ne 1) {
        throw "Unable to resolve a unique company-ai-platform Conda environment."
    }
    $pythonExe = Join-Path $matchingEnvironmentRoots[0] "python.exe"
}
if (-not (Test-Path -LiteralPath $pythonExe -PathType Leaf)) {
    throw "The company-ai-platform Python executable was not found."
}

# Process environment variables take precedence over .env.
$env:SCHEDULER_ENABLED = "true"
$env:TASK_QUEUE_ENABLED = "false"
$env:FEISHU_EVENT_TRANSPORT = "long_connection"

$preflightOutput = & $pythonExe -m app.tools.runtime_preflight
if ($LASTEXITCODE -ne 0) {
    throw "Runtime preflight failed. Review the configuration and migrate the platform database."
}
Write-Host ($preflightOutput | Select-Object -Last 1)

$timestamp = Get-Date -Format "yyyyMMdd-HHmmss"
function Start-HiddenRuntimeProcess {
    param(
        [string]$Name,
        [string[]]$Arguments,
        [string]$PidFile
    )

    $stdoutPath = Join-Path $logRoot "$Name-$timestamp.stdout.log"
    $stderrPath = Join-Path $logRoot "$Name-$timestamp.stderr.log"
    $process = Start-Process `
        -FilePath $pythonExe `
        -ArgumentList $Arguments `
        -WorkingDirectory $projectRoot `
        -WindowStyle Hidden `
        -RedirectStandardOutput $stdoutPath `
        -RedirectStandardError $stderrPath `
        -PassThru
    $identity = "$($process.Id)|$($process.StartTime.ToUniversalTime().Ticks)"
    Set-Content -LiteralPath $PidFile -Value $identity -NoNewline
    return @{
        Process = $process
        Stdout = $stdoutPath
        Stderr = $stderrPath
    }
}

$started = @()
try {
    $api = Start-HiddenRuntimeProcess `
        -Name "api" `
        -Arguments @(
            "-m", "uvicorn", "app.main:app",
            "--host", "127.0.0.1",
            "--port", "$Port"
        ) `
        -PidFile $pidFiles.Api
    $started += $api

    $feishuEvents = Start-HiddenRuntimeProcess `
        -Name "feishu-events" `
        -Arguments @("-m", "app.modules.feishu.long_connection") `
        -PidFile $pidFiles.FeishuEvents
    $started += $feishuEvents

    $deadline = (Get-Date).AddSeconds($ReadyTimeoutSeconds)
    $readyUrl = "http://127.0.0.1:$Port/api/v1/health/ready"
    while ((Get-Date) -lt $deadline) {
        foreach ($item in $started) {
            if ($item.Process.HasExited) {
                throw "A runtime process exited before readiness succeeded."
            }
        }
        try {
            $response = Invoke-WebRequest -Uri $readyUrl -TimeoutSec 3 -UseBasicParsing
            if ($response.StatusCode -eq 200) {
                Write-Host "Runtime is ready at http://127.0.0.1:$Port"
                Write-Host "Logs: $logRoot"
                return
            }
        } catch {
            # Readiness can be unavailable briefly while both processes initialize.
        }
        Start-Sleep -Seconds 1
    }
    throw "Runtime did not become ready within $ReadyTimeoutSeconds seconds."
} catch {
    foreach ($item in $started) {
        if (-not $item.Process.HasExited) {
            Stop-Process -Id $item.Process.Id -Force -ErrorAction SilentlyContinue
        }
    }
    Remove-Item -LiteralPath $pidFiles.Api, $pidFiles.FeishuEvents `
        -Force -ErrorAction SilentlyContinue
    throw
}