# # Locals block for hardcoded names. 
locals {
    backend_address_pool_name      = "${azurerm_virtual_network.test.name}-beap"
    frontend_port_name             = "${azurerm_virtual_network.test.name}-feport"
    frontend_ip_configuration_name = "${azurerm_virtual_network.test.name}-feip"
    http_setting_name              = "${azurerm_virtual_network.test.name}-be-htst"
    listener_name                  = "${azurerm_virtual_network.test.name}-httplstn"
    request_routing_rule_name      = "${azurerm_virtual_network.test.name}-rqrt"
    app_gateway_subnet_name = "appgwsubnet"
}

data "azurerm_resource_group" "rg" {
    name = var.resource_group_name
}

# User Assigned Identities 
resource "azurerm_user_assigned_identity" "testIdentity" {
    resource_group_name = data.azurerm_resource_group.rg.name
    location            = data.azurerm_resource_group.rg.location

    name = "identity1"

    tags = var.tags
}

resource "azurerm_virtual_network" "test" {
    name                = var.virtual_network_name
    location            = data.azurerm_resource_group.rg.location
    resource_group_name = data.azurerm_resource_group.rg.name
    address_space       = [var.virtual_network_address_prefix]

    subnet {
    name           = var.aks_subnet_name
    address_prefix = var.aks_subnet_address_prefix
    }

    subnet {
    name           = "appgwsubnet"
    address_prefix = var.app_gateway_subnet_address_prefix
    }

    tags = var.tags
}

data "azurerm_subnet" "kubesubnet" {
    name                 = var.aks_subnet_name
    virtual_network_name = azurerm_virtual_network.test.name
    resource_group_name  = data.azurerm_resource_group.rg.name
    depends_on = [azurerm_virtual_network.test]
}

data "azurerm_subnet" "appgwsubnet" {
    name                 = "appgwsubnet"
    virtual_network_name = azurerm_virtual_network.test.name
    resource_group_name  = data.azurerm_resource_group.rg.name
    depends_on = [azurerm_virtual_network.test]
}

# Public Ip 
resource "azurerm_public_ip" "test" {
    name                         = "publicIp1"
    location                     = data.azurerm_resource_group.rg.location
    resource_group_name          = data.azurerm_resource_group.rg.name
    allocation_method            = "Static"
    sku                          = "Standard"

    tags = var.tags
}

resource "azurerm_application_gateway" "network" {
    name                = var.app_gateway_name
    resource_group_name = data.azurerm_resource_group.rg.name
    location            = data.azurerm_resource_group.rg.location

    sku {
    name     = var.app_gateway_sku
    tier     = "Standard_v2"
    capacity = 2
    }

    gateway_ip_configuration {
    name      = "appGatewayIpConfig"
    subnet_id = data.azurerm_subnet.appgwsubnet.id
    }

    frontend_port {
    name = local.frontend_port_name
    port = 80
    }

    frontend_port {
    name = "httpsPort"
    port = 443
    }

    frontend_ip_configuration {
    name                 = local.frontend_ip_configuration_name
    public_ip_address_id = azurerm_public_ip.test.id
    }

    backend_address_pool {
    name = local.backend_address_pool_name
    }

    backend_http_settings {
    name                  = local.http_setting_name
    cookie_based_affinity = "Disabled"
    port                  = 80
    protocol              = "Http"
    request_timeout       = 1
    }

    http_listener {
    name                           = local.listener_name
    frontend_ip_configuration_name = local.frontend_ip_configuration_name
    frontend_port_name             = local.frontend_port_name
    protocol                       = "Http"
    }

    request_routing_rule {
    name                       = local.request_routing_rule_name
    rule_type                  = "Basic"
    http_listener_name         = local.listener_name
    backend_address_pool_name  = local.backend_address_pool_name
    backend_http_settings_name = local.http_setting_name
    }

    tags = var.tags

    depends_on = [azurerm_virtual_network.test, azurerm_public_ip.test]
}

resource "azurerm_role_assignment" "ra1" {
    scope                = data.azurerm_subnet.kubesubnet.id
    role_definition_name = "Network Contributor"
    principal_id         = var.aks_service_principal_object_id 

    depends_on = [azurerm_virtual_network.test]
}

resource "azurerm_role_assignment" "ra2" {
    scope                = azurerm_user_assigned_identity.testIdentity.id
    role_definition_name = "Managed Identity Operator"
    principal_id         = var.aks_service_principal_object_id
    depends_on           = [azurerm_user_assigned_identity.testIdentity]
}

resource "azurerm_role_assignment" "ra3" {
    scope                = azurerm_application_gateway.network.id
    role_definition_name = "Contributor"
    principal_id         = azurerm_user_assigned_identity.testIdentity.principal_id
    depends_on           = [azurerm_user_assigned_identity.testIdentity, azurerm_application_gateway.network]
}

resource "azurerm_role_assignment" "ra4" {
    scope                = data.azurerm_resource_group.rg.id
    role_definition_name = "Reader"
    principal_id         = azurerm_user_assigned_identity.testIdentity.principal_id
    depends_on           = [azurerm_user_assigned_identity.testIdentity, azurerm_application_gateway.network]
}

resource "azurerm_kubernetes_cluster" "k8s" {
    name       = var.aks_name
    location   = data.azurerm_resource_group.rg.location
    dns_prefix = var.aks_dns_prefix

    resource_group_name = data.azurerm_resource_group.rg.name

    linux_profile {
    admin_username = var.vm_user_name

    ssh_key {
        key_data = file(var.public_ssh_key_path)
    }
    }

    addon_profile {
    http_application_routing {
        enabled = false
    }
    }

    default_node_pool {
    name            = "agentpool"
    node_count      = var.aks_agent_count
    vm_size         = var.aks_agent_vm_size
    os_disk_size_gb = var.aks_agent_os_disk_size
    vnet_subnet_id  = data.azurerm_subnet.kubesubnet.id
    }

    service_principal {
    client_id     = var.aks_service_principal_app_id
    client_secret = var.aks_service_principal_client_secret
    }

    network_profile {
    network_plugin     = "azure"
    dns_service_ip     = var.aks_dns_service_ip
    docker_bridge_cidr = var.aks_docker_bridge_cidr
    service_cidr       = var.aks_service_cidr
    }

    role_based_access_control {
    enabled = var.aks_enable_rbac
    }

    depends_on = [azurerm_virtual_network.test, azurerm_application_gateway.network]
    tags       = var.tags
}