# Service Gateway Registration Script
param(
    [string]$Prefix = "activity",
    [string]$Version = "v1",
    [string]$GatewayUrl = "http://localhost:5000",
    [string]$Address = "http://localhost:5001",
    [string]$DestinationId = $null,
    [int]$Weight = 1,
    [switch]$Global = $true,
    [string]$TenantCode = ""
)

$ErrorActionPreference = "Stop"

# Derived values
$ClusterId = "$Prefix-service"
if ([string]::IsNullOrEmpty($DestinationId)) {
    $DestinationId = "$Prefix-1"
}
$PathPattern = "/$Prefix/$Version/{**path}"

Write-Host "╔════════════════════════════════════════════════════════════╗" -ForegroundColor Cyan
Write-Host "║         Service Gateway Registration                        ║" -ForegroundColor Cyan
Write-Host "╚════════════════════════════════════════════════════════════╝" -ForegroundColor Cyan
Write-Host ""

# Step 1: Add Service Instance
Write-Host "[1/3] Adding service instance..." -ForegroundColor Yellow

$instanceBody = @{
    destinationId = $DestinationId
    address       = $Address
    weight        = $Weight
} | ConvertTo-Json

try {
    $null = Invoke-RestMethod -Uri "$GatewayUrl/api/gateway/clusters/$ClusterId/instances" `
        -Method Post `
        -ContentType "application/json" `
        -Body $instanceBody
    Write-Host "  ✓ Instance: $DestinationId -> $Address" -ForegroundColor Green
}
catch {
    if ($_.Exception.Response.StatusCode -eq "BadRequest") {
        Write-Host "  ℹ Instance may already exist" -ForegroundColor Gray
    }
    else {
        throw $_
    }
}

# Step 2: Add Route
Write-Host ""
Write-Host "[2/3] Configuring gateway route..." -ForegroundColor Yellow

if ($Global) {
    $routeBody = @{
        serviceName = $Prefix
        clusterId   = $ClusterId
        pathPattern = $PathPattern
    } | ConvertTo-Json
    $routeType = "Global"
}
else {
    $routeBody = @{
        serviceName = $Prefix
        pathPattern = $PathPattern
    } | ConvertTo-Json
    $routeType = "Tenant [$TenantCode]"
}

try {
    $routeUrl = if ($Global) {
        "$GatewayUrl/api/gateway/routes/global"
    }
    else {
        "$GatewayUrl/api/gateway/tenants/$TenantCode/routes"
    }
    $null = Invoke-RestMethod -Uri $routeUrl `
        -Method Post `
        -ContentType "application/json" `
        -Body $routeBody
    Write-Host "  ✓ Route: $PathPattern -> $ClusterId" -ForegroundColor Green
}
catch {
    if ($_.Exception.Response.StatusCode -eq "BadRequest") {
        Write-Host "  ℹ Route may already exist" -ForegroundColor Gray
    }
    else {
        throw $_
    }
}

# Step 3: Reload Config
Write-Host ""
Write-Host "[3/3] Reloading gateway configuration..." -ForegroundColor Yellow
$null = Invoke-RestMethod -Uri "$GatewayUrl/api/gateway/reload" -Method Post
Write-Host "  ✓ Configuration reloaded" -ForegroundColor Green

# Summary
Write-Host ""
Write-Host "════════════════════════════════════════════════════════════" -ForegroundColor Cyan
Write-Host "  Service Registered Successfully!" -ForegroundColor Cyan
Write-Host "════════════════════════════════════════════════════════════" -ForegroundColor Cyan
Write-Host ""
Write-Host "  Service:   $Prefix" -ForegroundColor White
Write-Host "  Version:   $Version" -ForegroundColor White
Write-Host "  Cluster:  $ClusterId" -ForegroundColor White
Write-Host "  Type:      $routeType" -ForegroundColor White
Write-Host "  Pattern:  $PathPattern" -ForegroundColor White
Write-Host "  Address:  $Address" -ForegroundColor White
Write-Host ""
Write-Host "  Available Endpoints:" -ForegroundColor Yellow
Write-Host "  GET    $GatewayUrl/$Prefix/$Version/campaigns" -ForegroundColor Cyan
Write-Host "  POST   $GatewayUrl/$Prefix/$Version/campaigns" -ForegroundColor Cyan
Write-Host "  GET    $GatewayUrl/$Prefix/$Version/campaigns/{id}" -ForegroundColor Cyan
Write-Host "  POST   $GatewayUrl/$Prefix/$Version/campaigns/{id}/publish" -ForegroundColor Cyan
Write-Host ""