#!/bin/bash

# Copyright 2014 The Kubernetes Authors All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# This script contains skeletons of helper functions that each provider hosting
# Kubernetes must implement to use cluster/kube-*.sh scripts.
# It sets KUBERNETES_PROVIDER to its default value (gce) if it is unset, and
# then sources cluster/${KUBERNETES_PROVIDER}/util.sh.

KUBERNETES_PROVIDER="${KUBERNETES_PROVIDER:-gce}"

# Must ensure that the following ENV vars are set
function detect-master {
	echo "KUBE_MASTER_IP: $KUBE_MASTER_IP" 1>&2
	echo "KUBE_MASTER: $KUBE_MASTER" 1>&2
}

# Get node names if they are not static.
function detect-node-names {
	echo "NODE_NAMES: [${NODE_NAMES[*]}]" 1>&2
}

# Get node IP addresses and store in KUBE_NODE_IP_ADDRESSES[]
function detect-nodes {
	echo "KUBE_NODE_IP_ADDRESSES: [${KUBE_NODE_IP_ADDRESSES[*]}]" 1>&2
}

# Verify prereqs on host machine
function verify-prereqs {
	echo "TODO: verify-prereqs" 1>&2
}

# Validate a kubernetes cluster
function validate-cluster {
	# by default call the generic validate-cluster.sh script, customizable by
	# any cluster provider if this does not fit.
	"${KUBE_ROOT}/cluster/validate-cluster.sh"
}

# Instantiate a kubernetes cluster
function kube-up {
	echo "TODO: kube-up" 1>&2
}

# Delete a kubernetes cluster
function kube-down {
	echo "TODO: kube-down" 1>&2
}

# Update a kubernetes cluster
function kube-push {
	echo "TODO: kube-push" 1>&2
}

# Prepare update a kubernetes component
function prepare-push {
	echo "TODO: prepare-push" 1>&2
}

# Update a kubernetes master
function push-master {
	echo "TODO: push-master" 1>&2
}

# Update a kubernetes node
function push-node {
	echo "TODO: push-node" 1>&2
}

# Execute prior to running tests to build a release if required for env
function test-build-release {
	echo "TODO: test-build-release" 1>&2
}

# Execute prior to running tests to initialize required structure
function test-setup {
	echo "TODO: test-setup" 1>&2
}

# Execute after running tests to perform any required clean-up
function test-teardown {
	echo "TODO: test-teardown" 1>&2
}

KUBE_ROOT=$(dirname "${BASH_SOURCE}")/..
PROVIDER_UTILS="${KUBE_ROOT}/cluster/${KUBERNETES_PROVIDER}/util.sh"
if [ -f ${PROVIDER_UTILS} ]; then
    source "${PROVIDER_UTILS}"
fi

# Federation utils

# Should NOT be called within the global scope, unless setting the desired global zone vars
# This function is currently NOT USED in the global scope
function set-federated-zone-vars {
    zone="$1"
    export OVERRIDE_CONTEXT="federation-e2e-${KUBERNETES_PROVIDER}-$zone"
    echo "Setting zone vars to: $OVERRIDE_CONTEXT"
    if [[ "$KUBERNETES_PROVIDER" == "gce"  ]];then

	export KUBE_GCE_ZONE="$zone"
	# gcloud has a 61 character limit, and for firewall rules this
	# prefix gets appended to itslef, with some extra information
	# need tot keep it short
	export KUBE_GCE_INSTANCE_PREFIX="${USER}-${zone}"

    elif [[ "$KUBERNETES_PROVIDER" == "gke"  ]];then

	export CLUSTER_NAME="${USER}-${zone}"

    elif [[ "$KUBERNETES_PROVIDER" == "aws"  ]];then

	export KUBE_AWS_ZONE="$zone"
	export KUBE_AWS_INSTANCE_PREFIX="${USER}-${zone}"
    else
	echo "Provider \"${KUBERNETES_PROVIDER}\" is not supported"
	exit 1
    fi
}