[CmdletBinding()]
param(
    [string]$PgRoot = 'D:\pgsql17'
)

$ErrorActionPreference = 'Stop'
Set-StrictMode -Version Latest

$repoRoot = (Resolve-Path -LiteralPath (Join-Path $PSScriptRoot '..')).Path
$pgRootResolved = (Resolve-Path -LiteralPath $PgRoot).Path
$bin = Join-Path $pgRootResolved 'bin'
$initdb = Join-Path $bin 'initdb.exe'
$pgCtl = Join-Path $bin 'pg_ctl.exe'
$psql = Join-Path $bin 'psql.exe'
$createdb = Join-Path $bin 'createdb.exe'
foreach ($required in @($initdb, $pgCtl, $psql, $createdb)) {
    if (-not (Test-Path -LiteralPath $required -PathType Leaf)) {
        throw "PostgreSQL executable is missing under the selected PgRoot."
    }
}

$postgresExe = Join-Path $bin 'postgres.exe'
$version = (& $postgresExe --version 2>&1 | Out-String).Trim()
if ($LASTEXITCODE -ne 0 -or $version -notmatch 'PostgreSQL\) 17\.10$') {
    throw 'T-009 integration requires the frozen PostgreSQL 17.10 binaries.'
}

$existing5432 = @(
    Get-NetTCPConnection -State Listen -LocalPort 5432 -ErrorAction SilentlyContinue |
        Select-Object -ExpandProperty OwningProcess -Unique |
        Sort-Object
)

$listener = [System.Net.Sockets.TcpListener]::new(
    [System.Net.IPAddress]::Loopback,
    0
)
$listener.Start()
$port = ([System.Net.IPEndPoint]$listener.LocalEndpoint).Port
$listener.Stop()

$systemTemp = [IO.Path]::GetFullPath([IO.Path]::GetTempPath())
$clusterName = 'yovision-t009-pg-' + [guid]::NewGuid().ToString('N')
$dataDir = Join-Path $systemTemp $clusterName
$logPath = Join-Path $systemTemp ($clusterName + '.log')
$started = $false
$stopped = $false
$hadSenseDSN = Test-Path Env:YOVISION_TEST_POSTGRES_DSN
$previousSenseDSN = if ($hadSenseDSN) { (Get-Item Env:YOVISION_TEST_POSTGRES_DSN).Value } else { $null }
$hadAdminDSN = Test-Path Env:YOVISION_TEST_POSTGRES_ADMIN_DSN
$previousAdminDSN = if ($hadAdminDSN) { (Get-Item Env:YOVISION_TEST_POSTGRES_ADMIN_DSN).Value } else { $null }

function Invoke-Checked {
    param(
        [Parameter(Mandatory)] [string]$FilePath,
        [Parameter(ValueFromRemainingArguments)] [string[]]$Arguments
    )
    & $FilePath @Arguments
    if ($LASTEXITCODE -ne 0) {
        throw "Command failed with exit code $LASTEXITCODE."
    }
}

try {
    New-Item -ItemType Directory -Path $dataDir | Out-Null
    Invoke-Checked $initdb '-D' $dataDir '-U' 'postgres' '-A' 'trust' '--encoding=UTF8' '--no-locale' '--no-sync'
    $serverOptions = "-h 127.0.0.1 -p $port -c listen_addresses=127.0.0.1"
    Invoke-Checked $pgCtl '-D' $dataDir '-l' $logPath '-o' $serverOptions '-w' 'start'
    $started = $true

    $adminRootDSN = "postgres://postgres@127.0.0.1:$port/postgres?sslmode=disable"
    $databaseName = 'yovision_t009'
    $adminDatabaseDSN = "postgres://postgres@127.0.0.1:$port/${databaseName}?sslmode=disable"
    $senseDSN = "postgres://yovision_t009_sense@127.0.0.1:$port/${databaseName}?sslmode=disable"

    Invoke-Checked $psql '-X' '-v' 'ON_ERROR_STOP=1' '-d' $adminRootDSN '-f' (Join-Path $repoRoot 'deploy\postgres\001_roles.sql')
    Invoke-Checked $createdb '-h' '127.0.0.1' '-p' ([string]$port) '-U' 'postgres' $databaseName

    foreach ($pass in 1..2) {
        foreach ($name in @('002_bell.sql', '003_sense.sql', '004_privileges.sql')) {
            Invoke-Checked $psql '-X' '-v' 'ON_ERROR_STOP=1' '-d' $adminDatabaseDSN '-f' (Join-Path $repoRoot "deploy\postgres\$name")
        }
    }
    Invoke-Checked $psql '-X' '-v' 'ON_ERROR_STOP=1' '-d' $adminRootDSN '-c' 'CREATE ROLE yovision_t009_sense LOGIN IN ROLE sense_app'
    Invoke-Checked $psql '-X' '-v' 'ON_ERROR_STOP=1' '-d' $adminDatabaseDSN '-f' (Join-Path $repoRoot 'deploy\postgres\tests\assertions.sql')

    $env:YOVISION_TEST_POSTGRES_DSN = $senseDSN
    $env:YOVISION_TEST_POSTGRES_ADMIN_DSN = $adminDatabaseDSN
    Invoke-Checked 'go' '-C' (Join-Path $repoRoot 'Sense') 'test' './internal/store' '-run' '^TestPostgres' '-count=1'
}
finally {
    if ($started) {
        & $pgCtl '-D' $dataDir '-m' 'fast' '-w' 'stop'
        $stopped = $LASTEXITCODE -eq 0
    }
    if (-not $started -or $stopped) {
        $resolvedData = [IO.Path]::GetFullPath($dataDir)
        if (-not $resolvedData.StartsWith($systemTemp, [StringComparison]::OrdinalIgnoreCase) -or
            [IO.Path]::GetFileName($resolvedData) -notlike 'yovision-t009-pg-*') {
            throw "Refusing to clean unexpected temporary path."
        }
        if (Test-Path -LiteralPath $resolvedData) {
            Remove-Item -LiteralPath $resolvedData -Recurse -Force
        }
        if (Test-Path -LiteralPath $logPath) {
            Remove-Item -LiteralPath $logPath -Force
        }
    }
    else {
        Write-Warning 'Temporary PostgreSQL did not stop; its data directory was retained for manual recovery.'
    }
    if ($hadSenseDSN) {
        $env:YOVISION_TEST_POSTGRES_DSN = $previousSenseDSN
    }
    else {
        Remove-Item Env:YOVISION_TEST_POSTGRES_DSN -ErrorAction SilentlyContinue
    }
    if ($hadAdminDSN) {
        $env:YOVISION_TEST_POSTGRES_ADMIN_DSN = $previousAdminDSN
    }
    else {
        Remove-Item Env:YOVISION_TEST_POSTGRES_ADMIN_DSN -ErrorAction SilentlyContinue
    }
    $after5432 = @(
        Get-NetTCPConnection -State Listen -LocalPort 5432 -ErrorAction SilentlyContinue |
            Select-Object -ExpandProperty OwningProcess -Unique |
            Sort-Object
    )
    if (($existing5432 -join ',') -ne ($after5432 -join ',')) {
        throw 'The existing PostgreSQL listener on port 5432 changed during the isolated test.'
    }
}
Write-Output "PostgreSQL $version isolated integration passed; temporary port $port was cleaned."