param(
    [Parameter(Mandatory = $true)]
    [ValidateSet("rr_aligned_control", "rewrite", "soft_zones", "confirmed_rounds", "gate_v2")]
    [string]$LockedArm,
    [string]$Snapshot = "backtest_snapshots\prod.sqlite",
    [string]$Python = ".venv\Scripts\python.exe",
    [int]$Workers = 7
)

$ErrorActionPreference = "Stop"
$arms = @("production_control", $LockedArm)
foreach ($arm in $arms) {
    $output = "reports\backtest-sr-v2-validation-$arm.json"
    Write-Host "Running locked S/R validation arm: $arm"
    & $Python scripts\run_backtest_snapshot.py $Snapshot `
        --workers $Workers `
        --allow-spawn `
        --sr-variant $arm `
        --entry-start 2024-07-01 `
        --sr-audit `
        --out $output
    if ($LASTEXITCODE -ne 0) {
        throw "S/R validation arm failed: $arm"
    }
}

& $Python scripts\compare_sr_variants.py `
    reports\backtest-sr-v2-validation-production_control.json `
    "reports\backtest-sr-v2-validation-$LockedArm.json" `
    --out-csv reports\sr-v2-validation-cohorts.csv `
    --out-json reports\sr-v2-validation-comparison.json
if ($LASTEXITCODE -ne 0) {
    throw "S/R validation comparison failed"
}