// Container App module for DB Planet MCP Server

@description('The environment name (DEV, IAT, Prod)')
param environment string

@description('The location for the Container App')
param location string

@description('Tags to apply to resources')
param tags object

@description('Unique token for resource naming')
param resourceToken string

@description('Existing central Key Vault name (shared secrets)')
param centralKeyVaultName string

@description('Existing central Key Vault resource group')
param centralKeyVaultResourceGroup string

@description('App-specific Key Vault URI (created by keyvault.bicep)')
param appKeyVaultUri string

@description('Existing Container App Environment name')
param containerAppEnvironmentName string

@description('Existing Container App Environment resource group')
param containerAppEnvironmentResourceGroup string

@description('Artifactory server URL for container registry')
param artifactoryServer string

@description('Registry username for container registry authentication')
param registryUsername string

@description('Managed Identity ID for Key Vault access')
param managedIdentityId string

@description('Container image tag/version')
param imageTag string = 'latest'

@description('DB Planet base URL (staging vs production)')
param dbplanetBaseUrl string

@description('Custom domain name for the Container App')
param customDomainName string = ''

@description('Container App Certificate ID (if custom domain is configured)')
param containerAppCertificateId string = ''

var containerAppName = 'ca-dbp-${toLower(environment)}-${take(resourceToken, 8)}'

// Custom domain configuration
var customDomain = !empty(customDomainName) && !empty(containerAppCertificateId) ? [
  {
    name: customDomainName
    certificateId: containerAppCertificateId
    bindingType: 'SniEnabled'
  }
] : []

// Reference existing central Key Vault
resource centralKeyVault 'Microsoft.KeyVault/vaults@2024-11-01' existing = {
  name: centralKeyVaultName
  scope: resourceGroup(centralKeyVaultResourceGroup)
}


// Reference existing Container App Environment
resource containerAppEnvironment 'Microsoft.App/managedEnvironments@2025-01-01' existing = {
  name: containerAppEnvironmentName
  scope: resourceGroup(containerAppEnvironmentResourceGroup)
}

// Container App
resource containerApp 'Microsoft.App/containerApps@2025-01-01' = {
  name: containerAppName
  location: location
  tags: tags
  identity: {
    type: 'SystemAssigned, UserAssigned'
    userAssignedIdentities: {
      '${managedIdentityId}': {}
    }
  }
  properties: {
    managedEnvironmentId: containerAppEnvironment.id
    workloadProfileName: 'Consumption'
    configuration: {
      ingress: {
        external: true
        targetPort: 4000
        allowInsecure: false
        customDomains: customDomain
        traffic: [
          {
            weight: 100
            latestRevision: true
          }
        ]
      }
      secrets: [
        {
          name: 'artifactory-token'
          keyVaultUrl: '${centralKeyVault.properties.vaultUri}secrets/artifactory-registry-token'
          identity: managedIdentityId
        }
        {
          name: 'appinsights-connection-string'
          keyVaultUrl: '${appKeyVaultUri}secrets/applicationinsights-connection-string'
          identity: 'system'
        }
        {
          name: 'dbplanet-username'
          keyVaultUrl: '${appKeyVaultUri}secrets/DBPLANET-USERNAME'
          identity: 'system'
        }
        {
          name: 'dbplanet-password'
          keyVaultUrl: '${appKeyVaultUri}secrets/DBPLANET-PASSWORD'
          identity: 'system'
        }
        {
          name: 'dbplanet-client-id'
          keyVaultUrl: '${appKeyVaultUri}secrets/DBPLANET-CLIENT-ID'
          identity: 'system'
        }
        {
          name: 'dbplanet-client-secret'
          keyVaultUrl: '${appKeyVaultUri}secrets/DBPLANET-CLIENT-SECRET'
          identity: 'system'
        }
      ]
      registries: [
        {
          server: artifactoryServer
          username: registryUsername
          passwordSecretRef: 'artifactory-token'
        }
      ]
    }
    template: {
      containers: [
        {
          name: 'dbplanet-mcp'
          image: '${artifactoryServer}/db-planet-mcp-server:${imageTag}'
          resources: {
            cpu: json(environment == 'Prod' ? '1.0' : '0.5')
            memory: environment == 'Prod' ? '2Gi' : '1Gi'
          }
          env: [
            { name: 'DBPLANET_BASE_URL', value: dbplanetBaseUrl }
            { name: 'DBPLANET_USERNAME', secretRef: 'dbplanet-username' }
            { name: 'DBPLANET_PASSWORD', secretRef: 'dbplanet-password' }
            { name: 'DBPLANET_CLIENT_ID', secretRef: 'dbplanet-client-id' }
            { name: 'DBPLANET_CLIENT_SECRET', secretRef: 'dbplanet-client-secret' }
            { name: 'NODE_ENV', value: environment == 'Prod' ? 'production' : 'development' }
            { name: 'HTTP_PROXY', value: 'http://webproxy.comp.db.de:8080' }
            { name: 'HTTPS_PROXY', value: 'http://webproxy.comp.db.de:8080' }
            { name: 'http_proxy', value: 'http://webproxy.comp.db.de:8080' }
            { name: 'https_proxy', value: 'http://webproxy.comp.db.de:8080' }
            { name: 'NO_PROXY', value: '169.254.169.254,169.254.170.2,cognitiveservices.azure.com,internal.deutschebahn.com,db.de' }
            { name: 'no_proxy', value: '169.254.169.254,169.254.170.2,cognitiveservices.azure.com,internal.deutschebahn.com,db.de' }
            { name: 'STREAMABLE_HTTP', value: 'true' }
            { name: 'REMOTE_AUTHORIZATION', value: 'true' }
            { name: 'HOST', value: '0.0.0.0' }
            {
              name: 'APPLICATIONINSIGHTS_CONNECTION_STRING'
              secretRef: 'appinsights-connection-string'
            }
          ]
          probes: [
            {
              type: 'Readiness'
              httpGet: {
                path: '/health'
                port: 4000
              }
              initialDelaySeconds: 5
              periodSeconds: 30
            }
            {
              type: 'Liveness'
              httpGet: {
                path: '/health'
                port: 4000
              }
              initialDelaySeconds: 10
              periodSeconds: 60
            }
          ]
        }
      ]
      scale: {
        minReplicas: 1
        maxReplicas: 1
      }
    }
  }
}

output containerAppName string = containerApp.name
output containerAppId string = containerApp.id
output containerAppFqdn string = containerApp.properties.configuration.ingress.fqdn
output systemIdentityPrincipalId string = containerApp.identity.principalId
output containerAppEnvironmentStaticIp string = containerAppEnvironment.properties.staticIp