param(
    [string]$ApiBaseUrl = "http://192.168.200.61:18121/api/v1",
    [string]$ClusterID = "cfc0743d-d960-49fb-9de8-96e063d5e4aa",
    [string]$ActorUserID = "f67d943f-5397-4b3a-a229-695fe67ad700",
    [string]$EntryNodeName = "test-1",
    [string]$RelayNodeName = "test-3",
    [string]$ExitNodeName = "test-2",
    [string]$EntryBaseUrl = "http://192.168.200.61:19131",
    [string]$DockerSSH = "test-docker",
    [string]$ExpectedBackendImage = "rap-backend:fabric-service-channel-0.2.239",
    [string]$ExpectedNodeAgentImage = "rap-node-agent:0.2.237",
    [string]$ResultPath = "artifacts\c18z57-service-channel-remediation-command-smoke-result.json"
)

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

$scriptDir = Split-Path -Parent $MyInvocation.MyCommand.Path
$repoRoot = (Resolve-Path (Join-Path $scriptDir "..\..")).ProviderPath
$runId = "c18z57-" + (Get-Date -Format "yyyyMMdd-HHmmss")

function Invoke-Api {
    param(
        [string]$Method,
        [string]$Path,
        [object]$Body = $null
    )
    if ($null -eq $Body) {
        return Invoke-RestMethod -Method $Method -Uri "$ApiBaseUrl$Path" -TimeoutSec 30
    }
    return Invoke-RestMethod -Method $Method -Uri "$ApiBaseUrl$Path" -ContentType "application/json" -Body ($Body | ConvertTo-Json -Depth 80) -TimeoutSec 30
}

function Get-PropertyValue {
    param(
        [object]$Item,
        [string]$Name,
        [object]$Default = $null
    )
    if ($null -eq $Item) { return $Default }
    $property = $Item.PSObject.Properties[$Name]
    if ($null -eq $property) { return $Default }
    return $property.Value
}

function Get-NodeByName {
    param([string]$Name)
    $nodes = (Invoke-Api -Method GET -Path "/clusters/$ClusterID/nodes?actor_user_id=$ActorUserID").nodes
    $node = @($nodes | Where-Object { $_.name -eq $Name }) | Select-Object -First 1
    if ($null -eq $node) {
        throw "Node '$Name' was not found in cluster $ClusterID"
    }
    return $node
}

function New-RouteIntent {
    param(
        [string]$SourceNodeID,
        [string]$DestinationNodeID,
        [string[]]$Hops,
        [int]$Priority,
        [string]$Label
    )
    $expiresAt = (Get-Date).ToUniversalTime().AddMinutes(5).ToString("o")
    return Invoke-Api -Method POST -Path "/clusters/$ClusterID/mesh/route-intents" -Body @{
        actor_user_id = $ActorUserID
        source_selector = @{ node_id = $SourceNodeID }
        destination_selector = @{ node_id = $DestinationNodeID }
        service_class = "vpn_packets"
        priority = $Priority
        policy = @{
            synthetic_enabled = $true
            route_version = "$runId-$Label"
            policy_version = "$runId-$Label"
            peer_directory_version = "$runId-$Label"
            hops = @($Hops)
            allowed_channels = @("vpn_packet", "fabric_control")
            max_ttl = 8
            max_hops = 8
            expires_at = $expiresAt
            metadata = @{
                smoke = "c18z57_service_channel_remediation_command"
                run_id = $runId
                label = $Label
            }
        }
    }
}

function Send-DegradedHeartbeat {
    param(
        [string]$EntryNodeID,
        [string]$PrimaryRouteID
    )
    $observedAt = (Get-Date).ToUniversalTime().ToString("o")
    return Invoke-Api -Method POST -Path "/clusters/$ClusterID/nodes/$EntryNodeID/heartbeats" -Body @{
        health_status = "healthy"
        reported_version = "0.2.235"
        capabilities = @{
            fabric_service_channel_runtime = $true
            fabric_service_channel_route_manager = $true
            fabric_service_channel_route_quality_feedback = $true
            smoke_feedback_injection = "c18z57"
        }
        service_states = @{ smoke = "c18z57_primary_degraded_alternate_available" }
        metadata = @{
            fabric_service_channel_runtime_report = @{
                schema_version = "c18l.fabric_service_channel_runtime_report.v1"
                config_version = "$runId-primary"
                cluster_id = $ClusterID
                local_node_id = $EntryNodeID
                observed_at = $observedAt
                ingress = @{
                    flow_scheduler = @{
                        schema_version = "rap.fabric_flow_scheduler.v1"
                        service_neutral = $true
                        service_mode = "application_protocol_agnostic"
                        channel_stats = @{
                            "c18z57-primary-degraded" = @{
                                last_route_id = $PrimaryRouteID
                                last_failed_route_id = $PrimaryRouteID
                                route_generation = "$runId-primary"
                                last_error = "c18z57 primary route degraded; alternate available"
                                last_send_duration_ms = 980
                                consecutive_failures = 3
                                stall_count = 2
                                route_rebuild_recommended = $true
                                degraded_fallback_recommended = $false
                                quality_window_sample_count = 8
                                quality_window_success_count = 2
                                quality_window_failure_count = 3
                                quality_window_slow_count = 2
                                quality_window_drop_count = 1
                                quality_window_avg_latency_ms = 980
                                quality_window_last_updated_at = $observedAt
                            }
                        }
                    }
                }
            }
            smoke = @{
                name = "c18z57_service_channel_remediation_command"
                run_id = $runId
            }
        }
    }
}

$entryNode = Get-NodeByName -Name $EntryNodeName
$relayNode = Get-NodeByName -Name $RelayNodeName
$exitNode = Get-NodeByName -Name $ExitNodeName
$primaryRouteID = ""
$alternateRouteID = ""
$result = $null

try {
    $primary = (New-RouteIntent -SourceNodeID $entryNode.id -DestinationNodeID $exitNode.id -Hops @($entryNode.id, $exitNode.id) -Priority 2100000000 -Label "primary").route_intent
    $alternate = (New-RouteIntent -SourceNodeID $entryNode.id -DestinationNodeID $exitNode.id -Hops @($entryNode.id, $relayNode.id, $exitNode.id) -Priority 2099999900 -Label "alternate").route_intent
    $primaryRouteID = [string]$primary.id
    $alternateRouteID = [string]$alternate.id

    $resourceID = "c18z57-vpn-smoke"
    $lease = (Invoke-Api -Method POST -Path "/clusters/$ClusterID/fabric/service-channels/leases" -Body @{
        actor_user_id = $ActorUserID
        organization_id = "smoke-org"
        user_id = "smoke-user"
        resource_id = $resourceID
        service_class = "vpn_packets"
        entry_node_ids = @([string]$entryNode.id)
        exit_node_ids = @([string]$exitNode.id)
        preferred_entry_node_id = [string]$entryNode.id
        preferred_exit_node_id = [string]$exitNode.id
        allowed_channels = @("vpn_packet", "fabric_control")
        ttl_seconds = 180
        metadata = @{
            smoke = "c18z57_service_channel_remediation_command"
            run_id = $runId
        }
    }).fabric_service_channel_lease

    [void](Send-DegradedHeartbeat -EntryNodeID $entryNode.id -PrimaryRouteID $primaryRouteID)

    $packetPath = $lease.entry_http.path_template.
        Replace("{cluster_id}", $ClusterID).
        Replace("{channel_id}", [string]$lease.channel_id).
        Replace("{resource_id}", $resourceID)
    $packetUrl = $EntryBaseUrl.TrimEnd("/") + $packetPath
    $headers = @{
        "X-RAP-Service-Channel-Token" = [string]$lease.token.token
        "X-RAP-Fabric-Channel-ID" = [string]$lease.channel_id
        "X-RAP-Service-Class" = "vpn_packets"
        "X-RAP-Channel-Class" = "vpn_packet"
    }
    $response = Invoke-WebRequest -Method Post -Uri $packetUrl -Headers $headers -Body ([System.Text.Encoding]::UTF8.GetBytes("c18z57-alternate-remediation")) -ContentType "application/octet-stream" -TimeoutSec 30
    $acceptedBy = [string]$response.Headers["X-RAP-Service-Channel-Accepted-By"]

    $accessTelemetry = $null
    $matchingChannel = $null
    for ($i = 0; $i -lt 10; $i++) {
        Start-Sleep -Seconds 3
        $accessTelemetry = (Invoke-Api -Method GET -Path "/clusters/$ClusterID/fabric/service-channels/access-telemetry?actor_user_id=$ActorUserID&limit=20").fabric_service_channel_access_telemetry
        $channels = @()
        if ($accessTelemetry.PSObject.Properties.Name -contains "active_channels") {
            $channels = @($accessTelemetry.active_channels)
        }
        $matchingChannel = $channels | Where-Object { $_.channel_id -eq $lease.channel_id } | Select-Object -First 1
        if ($null -ne $matchingChannel -and [string](Get-PropertyValue -Item $matchingChannel -Name "remediation_action" -Default "") -eq "prefer_alternate_route") {
            break
        }
    }

    $backendLine = (& ssh $DockerSSH "docker ps --format '{{.Names}} {{.Image}} {{.Status}}' | grep '^rap_test_backend '") | Out-String
    $nodeLines = (& ssh $DockerSSH "docker ps --format '{{.Names}} {{.Image}} {{.Status}}' | grep '^rap_test_node_test_'") | Out-String
    $leasePrimaryRouteID = [string](Get-PropertyValue -Item (Get-PropertyValue -Item $lease -Name "primary_route" -Default $null) -Name "route_id" -Default "")
    $leaseAlternates = @()
    if ($lease.PSObject.Properties.Name -contains "alternate_routes") {
        $leaseAlternates = @($lease.alternate_routes)
    }
    $leaseHasAlternate = (@($leaseAlternates | Where-Object { [string]$_.route_id -eq $alternateRouteID }).Count -ge 1)
    $remediationCommand = Get-PropertyValue -Item $matchingChannel -Name "remediation_command" -Default $null
    $commandAction = [string](Get-PropertyValue -Item $remediationCommand -Name "action" -Default "")
    $commandPrimaryRouteID = [string](Get-PropertyValue -Item $remediationCommand -Name "primary_route_id" -Default "")
    $commandReplacementRouteID = [string](Get-PropertyValue -Item $remediationCommand -Name "replacement_route_id" -Default "")
    $commandExpiresAt = [string](Get-PropertyValue -Item $remediationCommand -Name "expires_at" -Default "")

    $result = [ordered]@{
        schema_version = "c18z57.service_channel_remediation_command_smoke.v1"
        run_id = $runId
        cluster_id = $ClusterID
        primary_route_id = $primaryRouteID
        alternate_route_id = $alternateRouteID
        channel_id = [string]$lease.channel_id
        passed = [bool](
            $backendLine.Contains($ExpectedBackendImage) -and
            $nodeLines.Contains($ExpectedNodeAgentImage) -and
            [string]$lease.status -eq "ready" -and
            $leasePrimaryRouteID -eq $primaryRouteID -and
            $leaseHasAlternate -and
            [int]$response.StatusCode -eq 202 -and
            $acceptedBy -eq "introspection" -and
            $null -ne $matchingChannel -and
            [string](Get-PropertyValue -Item $matchingChannel -Name "primary_route_id" -Default "") -eq $primaryRouteID -and
            -not [bool](Get-PropertyValue -Item $matchingChannel -Name "force_degraded_route" -Default $false) -and
            [string](Get-PropertyValue -Item $matchingChannel -Name "route_feedback_status" -Default "") -eq "fenced" -and
            [string](Get-PropertyValue -Item $matchingChannel -Name "remediation_action" -Default "") -eq "prefer_alternate_route" -and
            [string](Get-PropertyValue -Item $matchingChannel -Name "remediation_route_id" -Default "") -eq $alternateRouteID -and
            $null -ne $remediationCommand -and
            $commandAction -eq "prefer_alternate_route" -and
            $commandPrimaryRouteID -eq $primaryRouteID -and
            $commandReplacementRouteID -eq $alternateRouteID -and
            $commandExpiresAt.Length -gt 0 -and
            [int]$accessTelemetry.degraded_fallback_channel_count -eq 0
        )
        checks = [ordered]@{
            backend_expected_image_deployed = $backendLine.Contains($ExpectedBackendImage)
            node_agent_expected_image_deployed = $nodeLines.Contains($ExpectedNodeAgentImage)
            lease_ready = ([string]$lease.status -eq "ready")
            lease_selected_primary_route = ($leasePrimaryRouteID -eq $primaryRouteID)
            lease_contains_alternate_route = $leaseHasAlternate
            packet_accepted = ([int]$response.StatusCode -eq 202)
            accepted_by_header_is_introspection = ($acceptedBy -eq "introspection")
            active_channel_visible = ($null -ne $matchingChannel)
            active_channel_not_degraded_route = ($null -ne $matchingChannel -and -not [bool](Get-PropertyValue -Item $matchingChannel -Name "force_degraded_route" -Default $false))
            route_quality_fenced = ($null -ne $matchingChannel -and [string](Get-PropertyValue -Item $matchingChannel -Name "route_feedback_status" -Default "") -eq "fenced")
            remediation_prefers_alternate = ($null -ne $matchingChannel -and [string](Get-PropertyValue -Item $matchingChannel -Name "remediation_action" -Default "") -eq "prefer_alternate_route")
            remediation_route_is_alternate = ($null -ne $matchingChannel -and [string](Get-PropertyValue -Item $matchingChannel -Name "remediation_route_id" -Default "") -eq $alternateRouteID)
            remediation_command_visible = ($null -ne $remediationCommand)
            remediation_command_prefers_alternate = ($commandAction -eq "prefer_alternate_route")
            remediation_command_primary_route_matches = ($commandPrimaryRouteID -eq $primaryRouteID)
            remediation_command_replacement_route_matches = ($commandReplacementRouteID -eq $alternateRouteID)
            remediation_command_has_ttl = ($commandExpiresAt.Length -gt 0)
            degraded_route_not_recommended = ([int]$accessTelemetry.degraded_fallback_channel_count -eq 0)
        }
        summary = [ordered]@{
            backend_container = $backendLine.Trim()
            node_containers = $nodeLines.Trim()
            accepted_by = $acceptedBy
            lease_status = [string]$lease.status
            lease_primary_route_id = $leasePrimaryRouteID
            lease_alternate_route_count = $leaseAlternates.Count
            access_status = [string]$accessTelemetry.status
            active_channel_count = [int]$accessTelemetry.active_channel_count
            correlated_route_count = [int]$accessTelemetry.correlated_route_count
            degraded_route_count = [int]$accessTelemetry.degraded_route_count
            degraded_fallback_channel_count = [int]$accessTelemetry.degraded_fallback_channel_count
            matching_channel = $matchingChannel
        }
    }
    $failedChecks = @($result.checks.GetEnumerator() | Where-Object { $_.Value -ne $true })
    if ($failedChecks.Count -gt 0) {
        throw "C18Z57 failed checks: $($failedChecks.Name -join ', ')"
    }
}
finally {
    if ($primaryRouteID) {
        try { Invoke-Api -Method POST -Path "/clusters/$ClusterID/mesh/route-intents/$primaryRouteID/expire" -Body @{ actor_user_id = $ActorUserID } | Out-Null } catch {}
    }
    if ($alternateRouteID) {
        try { Invoke-Api -Method POST -Path "/clusters/$ClusterID/mesh/route-intents/$alternateRouteID/expire" -Body @{ actor_user_id = $ActorUserID } | Out-Null } catch {}
    }
}

$resultFullPath = Join-Path $repoRoot $ResultPath
$resultDir = Split-Path -Parent $resultFullPath
if (-not (Test-Path $resultDir)) {
    New-Item -ItemType Directory -Path $resultDir | Out-Null
}
$result | ConvertTo-Json -Depth 100 | Set-Content -Path $resultFullPath -Encoding UTF8

Write-Host "C18Z57 service-channel remediation command smoke passed. Result: $resultFullPath"
$result