#!/bin/bash

function check_linkerd_binary(){
    printf "Checking the linkerd binary..."
    if [[ "$linkerd_path" != /* ]]; then
        printf "\\n[%s] is not an absolute path\\n" "$linkerd_path"
        exit 1
    fi
    if [ ! -x "$linkerd_path" ]; then
        printf "\\n[%s] does not exist or is not executable\\n" "$linkerd_path"
        exit 1
    fi
    exit_code=0
    "$linkerd_path" version --client > /dev/null 2>&1
    exit_on_err "error running linkerd version command"
    printf "[ok]\\n"
}

function check_if_k8s_reachable(){
    printf "Checking if there is a Kubernetes cluster available..."
    exit_code=0
    kubectl --context=$k8s_context --request-timeout=5s get ns > /dev/null 2>&1
    exit_on_err "error connecting to Kubernetes cluster"
    printf "[ok]\\n"
}

function remove_l5d_if_exists() {
  resources=$(kubectl --context=$k8s_context get all,clusterrole,clusterrolebinding,mutatingwebhookconfigurations,validatingwebhookconfigurations,psp,crd -l linkerd.io/control-plane-ns --all-namespaces -oname)
  if [ ! -z "$resources" ]; then
    printf "Removing existing l5d installation..."
    cleanup
    printf "[ok]\\n"
  fi

  # Cleanup Helm, in case it's there (if not, we ignore the error)
  helm_cleanup &> /dev/null || true
}

function cleanup() {
    $bindir/test-cleanup $k8s_context > /dev/null 2>&1
    exit_on_err "error removing existing Linkerd resources"
}

function run_test(){
    filename="$1"
    shift

    printf "Test script: [%s] Params: [%s]\n" "$(basename $filename)" "$*"
    GO111MODULE=on go test --mod=readonly "$filename" --linkerd="$linkerd_path" --k8s-context="$k8s_context" --integration-tests "$@"
}

# Install the latest stable release.
# $1 - namespace to use for the stable release
function install_stable() {
    tmp=$(mktemp -d -t l5dbin.XXX)
    trap "rm -rf $tmp" RETURN

    curl -s https://run.linkerd.io/install | HOME=$tmp sh > /dev/null 2>&1

    local linkerd_path=$tmp/.linkerd2/bin/linkerd
    local stable_namespace="$1"
    $linkerd_path install --linkerd-namespace="$stable_namespace" | kubectl --context=$k8s_context apply -f - > /dev/null 2>&1
    $linkerd_path check --linkerd-namespace="$stable_namespace" > /dev/null 2>&1
}

# Run the upgrade test by upgrading the most-recent stable release to the HEAD of
# this branch.
# $1 - namespace to use for the stable release
function run_upgrade_test() {
    local stable_namespace="$1"
    local stable_version=$(curl -s https://versioncheck.linkerd.io/version.json | grep -o "stable-[0-9]*.[0-9]*.[0-9]*")

    install_stable $stable_namespace
    run_test "$test_directory/install_test.go" -failfast --upgrade-from-version=$stable_version --linkerd-namespace=$stable_namespace
}

function run_helm_test() {
    (
        set -e
        kubectl --context=$k8s_context create ns $tiller_namespace
        kubectl --context=$k8s_context label ns $tiller_namespace linkerd.io/is-test-helm=true
        kubectl --context=$k8s_context create clusterrolebinding ${tiller_namespace}:tiller-cluster-admin --clusterrole=cluster-admin --serviceaccount=${tiller_namespace}:default
        kubectl --context=$k8s_context label clusterrolebinding ${tiller_namespace}:tiller-cluster-admin linkerd.io/is-test-helm=true
        $helm_path --kube-context=$k8s_context --tiller-namespace=$tiller_namespace init --wait
        $helm_path --kube-context=$k8s_context --tiller-namespace=$tiller_namespace dependency update $helm_chart
    )
    exit_on_err "error setting up Helm"
    run_test "$test_directory/install_test.go" -failfast --linkerd-namespace=$linkerd_namespace-helm \
        --helm-path=$helm_path --helm-chart=$helm_chart --helm-release=$helm_release_name --tiller-ns=$tiller_namespace
}

function helm_cleanup() {
    (
        set -e
        # `helm delete` deletes $linkerd_namespace-helm
        $helm_path --kube-context=$k8s_context --tiller-namespace=$tiller_namespace delete --purge $helm_release_name
        # `helm delete` doesn't wait for resources to be deleted, so we wait explicitly.
        # We wait for the namespace to be gone so the following call to `cleanup` doesn't fail when it attempts to delete
        # the same namespace that is already being deleted here (error thrown by the NamespaceLifecycle controller).
        # We don't have that problem with global resources, so no need to wait for them to be gone.
        kubectl wait --for=delete ns/$linkerd_namespace-helm --timeout=40s
        # `helm reset` deletes the tiller pod in $tiller_namespace
        $helm_path --kube-context=$k8s_context --tiller-namespace=$tiller_namespace reset
        kubectl --context=$k8s_context delete clusterrolebinding ${tiller_namespace}:tiller-cluster-admin
        echo $tiller_namespace
        kubectl --context=$k8s_context delete ns $tiller_namespace
    )
}

function exit_on_err() {
    exit_code=$?
    if [ $exit_code -ne 0 ]; then
        printf "\\n=== FAIL: %s\\n" "$@"
        exit $exit_code
    fi
}

linkerd_path=$1
if [ -z "$linkerd_path" ]; then
    echo "usage: $(basename "$0") /path/to/linkerd [namespace] [k8s-context]" >&2
    exit 64
fi

bindir="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
rootdir="$( cd $bindir/.. && pwd )"
test_directory="$bindir/../test"
linkerd_version=$($linkerd_path version --client --short)
linkerd_namespace=${2:-l5d-integration}
k8s_context=${3:-""}
helm_path=$bindir/helm
helm_chart=$rootdir/charts/linkerd2
helm_release_name=$linkerd_namespace-test
tiller_namespace=$linkerd_namespace-tiller

check_linkerd_binary
check_if_k8s_reachable
remove_l5d_if_exists

printf "==================RUNNING ALL TESTS==================\\n"
printf "Testing Linkerd version [%s] namespace [%s] k8s-context [%s]\\n" "$linkerd_version" "$linkerd_namespace" "$k8s_context"

# run upgrade test:
# 1. install latest stable
# 2. upgrade to HEAD
# 3. if failed, exit script to avoid leaving behind stale resources which will
# fail subsequent tests. `cleanup` is not called if this test failed so that
# there is a chance to debug the problem
run_upgrade_test "$linkerd_namespace"-upgrade
exit_on_err "can't upgrade to version $linkerd_version"
cleanup

run_helm_test
exit_on_err "error testing Helm"
helm_cleanup
exit_on_err "error cleaning up Helm"
# clean the data plane test resources
cleanup

run_test "$test_directory/install_test.go" -failfast --linkerd-namespace=$linkerd_namespace
exit_on_err "error during install"

for test in $(find "$test_directory" -mindepth 2 -name '*_test.go'); do
    run_test "$test" --linkerd-namespace=$linkerd_namespace || exit_code=$?
done

if [ $exit_code -eq 0 ]; then
    printf "\\n=== PASS: all tests passed\\n"
    cleanup
else
    # `cleanup` is not called so that there is a chance to debug the problem
    printf "\\n=== FAIL: at least one test failed\\n"
fi

exit $exit_code