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]$ResultPath = "artifacts\c18z12-service-channel-route-quality-smoke-result.json"
)

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

$repoRoot = (Resolve-Path (Join-Path $PSScriptRoot "..\..")).ProviderPath
$runId = "c18z12-" + (Get-Date -Format "yyyyMMdd-HHmmss")
$resourceId = "vpn-$runId"

function Invoke-Api {
    param(
        [string]$Method,
        [string]$Path,
        [object]$Body = $null
    )
    $uri = "$ApiBaseUrl$Path"
    try {
        if ($null -eq $Body) {
            return Invoke-RestMethod -Method $Method -Uri $uri -TimeoutSec 30
        }
        return Invoke-RestMethod -Method $Method -Uri $uri -ContentType "application/json" -Body ($Body | ConvertTo-Json -Depth 80) -TimeoutSec 30
    }
    catch {
        $statusCode = $null
        if ($_.Exception.Response) {
            $statusCode = [int]$_.Exception.Response.StatusCode
        }
        $details = $_.ErrorDetails.Message
        if (-not $details) {
            $details = $_.Exception.Message
        }
        throw "$Method $Path failed with HTTP $statusCode`: $details"
    }
}

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 Get-SmokeRouteLabel {
    param([object]$RouteIntent)
    if ($null -eq $RouteIntent -or $null -eq $RouteIntent.PSObject.Properties["policy"]) {
        return ""
    }
    $policy = $RouteIntent.policy
    if ($null -eq $policy -or $null -eq $policy.PSObject.Properties["metadata"]) {
        return ""
    }
    $metadata = $policy.metadata
    if ($null -eq $metadata) {
        return ""
    }
    $smoke = $metadata.PSObject.Properties["smoke"]
    if ($null -eq $smoke) {
        return ""
    }
    return [string]$smoke.Value
}

function Clear-SmokeRouteIntents {
    $items = (Invoke-Api -Method GET -Path "/clusters/$ClusterID/mesh/route-intents?actor_user_id=$ActorUserID").route_intents
    foreach ($item in @($items)) {
        if ([string]$item.lifecycle_status -ne "active") {
            continue
        }
        if ([string]$item.service_class -ne "vpn_packets") {
            continue
        }
        if ((Get-SmokeRouteLabel -RouteIntent $item) -ne "c18z12_service_channel_route_quality") {
            continue
        }
        Invoke-Api -Method POST -Path "/clusters/$ClusterID/mesh/route-intents/$($item.id)/expire" -Body @{ actor_user_id = $ActorUserID } | Out-Null
    }
}

function New-RouteIntent {
    param(
        [string]$SourceNodeID,
        [string]$DestinationNodeID,
        [string[]]$Hops,
        [int]$Priority,
        [string]$Label
    )
    $expiresAt = (Get-Date).ToUniversalTime().AddMinutes(10).ToString("o")
    return Invoke-Api -Method POST -Path "/clusters/$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 = "c18z12_service_channel_route_quality"
                run_id = $runId
                label = $Label
                route_quality_smoke = $true
            }
        }
    }
}

function New-ServiceChannelLease {
    param(
        [string]$EntryNodeID,
        [string]$ExitNodeID
    )
    return (Invoke-Api -Method POST -Path "/clusters/$ClusterID/fabric/service-channels/leases" -Body @{
        actor_user_id = $ActorUserID
        organization_id = "org-c18z12-smoke"
        user_id = $ActorUserID
        resource_id = $resourceId
        service_class = "vpn_packets"
        entry_node_ids = @($EntryNodeID)
        exit_node_ids = @($ExitNodeID)
        preferred_entry_node_id = $EntryNodeID
        preferred_exit_node_id = $ExitNodeID
        allowed_channels = @("vpn_packet", "bulk", "control")
        ttl_seconds = 300
        metadata = @{
            smoke = "c18z12_service_channel_route_quality"
            run_id = $runId
        }
    }).fabric_service_channel_lease
}

function Send-QualityHeartbeat {
    param(
        [string]$EntryNodeID,
        [string]$SlowRouteID,
        [string]$FastRouteID
    )
    $observedAt = (Get-Date).ToUniversalTime().ToString("o")
    return Invoke-Api -Method POST -Path "/clusters/$ClusterID/nodes/$EntryNodeID/heartbeats" -Body @{
        health_status = "healthy"
        reported_version = "0.2.185"
        capabilities = @{
            fabric_service_channel_route_manager = $true
            fabric_service_channel_route_quality_feedback = $true
        }
        service_states = @{ smoke = "c18z12_route_quality_feedback" }
        metadata = @{
            fabric_service_channel_runtime_report = @{
                schema_version = "c18l.fabric_service_channel_runtime_report.v1"
                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 = @{
                            "quality-fast" = @{
                                last_route_id = $FastRouteID
                                last_next_hop = "fast"
                                last_send_duration_ms = 8
                                consecutive_failures = 0
                                stall_count = 0
                                route_rebuild_recommended = $false
                                degraded_fallback_recommended = $false
                            }
                            "quality-slow" = @{
                                last_route_id = $SlowRouteID
                                last_next_hop = "slow"
                                last_send_duration_ms = 900
                                consecutive_failures = 0
                                stall_count = 0
                                route_rebuild_recommended = $false
                                degraded_fallback_recommended = $false
                            }
                        }
                    }
                }
            }
        }
    }
}

$entryNode = Get-NodeByName -Name $EntryNodeName
$relayNode = Get-NodeByName -Name $RelayNodeName
$exitNode = Get-NodeByName -Name $ExitNodeName
$slowRouteID = ""
$fastRouteID = ""
$result = $null

try {
    Clear-SmokeRouteIntents
    $slowIntent = New-RouteIntent `
        -SourceNodeID $entryNode.id `
        -DestinationNodeID $exitNode.id `
        -Hops @($entryNode.id, $relayNode.id, $exitNode.id) `
        -Priority 2000000000 `
        -Label "slow-high-priority"
    $fastIntent = New-RouteIntent `
        -SourceNodeID $entryNode.id `
        -DestinationNodeID $exitNode.id `
        -Hops @($entryNode.id, $exitNode.id) `
        -Priority 1999999950 `
        -Label "fast-lower-priority"
    $slowRouteID = $slowIntent.route_intent.id
    $fastRouteID = $fastIntent.route_intent.id

    $initialLease = New-ServiceChannelLease -EntryNodeID $entryNode.id -ExitNodeID $exitNode.id
    if ($initialLease.status -ne "ready" -or [string]$initialLease.primary_route.route_id -ne $slowRouteID) {
        throw "Initial lease should select higher-priority slow route '$slowRouteID': status=$($initialLease.status) route=$($initialLease.primary_route.route_id)"
    }

    $qualityHeartbeat = Send-QualityHeartbeat -EntryNodeID $entryNode.id -SlowRouteID $slowRouteID -FastRouteID $fastRouteID
    Start-Sleep -Seconds 2
    $qualityLease = New-ServiceChannelLease -EntryNodeID $entryNode.id -ExitNodeID $exitNode.id
    if ($qualityLease.status -ne "ready" -or [string]$qualityLease.primary_route.route_id -ne $fastRouteID) {
        throw "Quality lease should select fast route '$fastRouteID': status=$($qualityLease.status) route=$($qualityLease.primary_route.route_id) score=$($qualityLease.primary_route.path_score)"
    }

    $expiredSlow = Invoke-Api -Method POST -Path "/clusters/$ClusterID/mesh/route-intents/$slowRouteID/expire" -Body @{ actor_user_id = $ActorUserID }
    $expiredFast = Invoke-Api -Method POST -Path "/clusters/$ClusterID/mesh/route-intents/$fastRouteID/expire" -Body @{ actor_user_id = $ActorUserID }

    $result = [ordered]@{
        schema_version = "c18z12.service_channel_route_quality_smoke.v1"
        run_id = $runId
        base_url = $ApiBaseUrl
        cluster_id = $ClusterID
        entry_node = @{ name = $entryNode.name; id = $entryNode.id }
        relay_node = @{ name = $relayNode.name; id = $relayNode.id }
        exit_node = @{ name = $exitNode.name; id = $exitNode.id }
        resource_id = $resourceId
        route_intents = @{
            slow_route_id = $slowRouteID
            fast_route_id = $fastRouteID
            slow_hops = @($entryNode.id, $relayNode.id, $exitNode.id)
            fast_hops = @($entryNode.id, $exitNode.id)
            expired_slow_status = $expiredSlow.route_intent.lifecycle_status
            expired_fast_status = $expiredFast.route_intent.lifecycle_status
        }
        initial_lease = @{
            status = $initialLease.status
            primary_route_id = $initialLease.primary_route.route_id
            primary_path_score = $initialLease.primary_route.path_score
            score_reasons = $initialLease.primary_route.score_reasons
        }
        quality_lease = @{
            status = $qualityLease.status
            primary_route_id = $qualityLease.primary_route.route_id
            primary_path_score = $qualityLease.primary_route.path_score
            score_reasons = $qualityLease.primary_route.score_reasons
        }
        feedback = @{
            heartbeat_status = $qualityHeartbeat.heartbeat.health_status
            fast_last_send_duration_ms = 8
            slow_last_send_duration_ms = 900
        }
        passed = $true
        checks = [ordered]@{
            initial_prefers_high_priority_slow_route = ([string]$initialLease.primary_route.route_id -eq $slowRouteID)
            quality_prefers_fast_route = ([string]$qualityLease.primary_route.route_id -eq $fastRouteID)
            fast_route_has_quality_reason = (@($qualityLease.primary_route.score_reasons | Where-Object { $_ -eq "service_channel_quality_latency_le_10ms" }).Count -ge 1)
            route_intents_expired = ($expiredSlow.route_intent.lifecycle_status -eq "expired" -and $expiredFast.route_intent.lifecycle_status -eq "expired")
        }
    }
    $failedChecks = @($result.checks.GetEnumerator() | Where-Object { $_.Value -ne $true })
    if ($failedChecks.Count -gt 0) {
        throw "C18Z12 failed checks: $($failedChecks.Name -join ', ')"
    }
}
finally {
    if ($slowRouteID) {
        try { Invoke-Api -Method POST -Path "/clusters/$ClusterID/mesh/route-intents/$slowRouteID/expire" -Body @{ actor_user_id = $ActorUserID } | Out-Null } catch {}
    }
    if ($fastRouteID) {
        try { Invoke-Api -Method POST -Path "/clusters/$ClusterID/mesh/route-intents/$fastRouteID/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 "C18Z12 service-channel route quality smoke passed. Result: $resultFullPath"
$result