#!/usr/bin/env bash

set -o errexit
set -o nounset
set -o pipefail

readonly CLUSTER_NAME=chart-testing

lint_charts() {
    echo
    echo "Starting charts linting..."
    mkdir -p tmp
    docker run --rm -v "$(pwd):/workdir" --workdir /workdir "$CHART_TESTING_IMAGE:$CHART_TESTING_TAG" ct lint --config /workdir/test/ct.yaml | tee tmp/lint.log || true
    echo "Done Charts Linting!"

    if grep -q "No chart changes detected" tmp/lint.log  > /dev/null; then
        echo "No chart changes detected, stopping pipeline!"
        exit 0
    elif grep -q "Error linting charts" tmp/lint.log  > /dev/null; then
        echo "Error linting charts stopping pipeline!"
        exit 1
    else
        install_charts
    fi
}

run_ct_container() {
    echo 'Running ct container...'
    docker run --rm --interactive --detach --network host --name ct \
        --volume "$(pwd):/workdir" \
        --workdir /workdir \
        "$CHART_TESTING_IMAGE:$CHART_TESTING_TAG" \
        cat
    echo
}

cleanup() {
    echo 'Removing ct container...'
    docker kill ct > /dev/null 2>&1

    echo 'Done!'
}

docker_exec() {
    docker exec --interactive -e HELM_HOST=127.0.0.1:44134 -e HELM_TILLER_SILENT=true ct "$@"
}

create_kind_cluster() {
    echo 'Installing kind...'

    curl -sSLo kind "https://github.com/kubernetes-sigs/kind/releases/download/$KIND_VERSION/kind-linux-amd64"
    chmod +x kind
    sudo mv kind /usr/local/bin/kind

    kind create cluster --name "$CLUSTER_NAME" --image "kindest/node:$K8S_VERSION"

    docker_exec mkdir -p /root/.kube

    echo 'Copying kubeconfig to container...'
    local kubeconfig
    kubeconfig="$(kind get kubeconfig-path --name "$CLUSTER_NAME")"
    docker cp "$kubeconfig" ct:/root/.kube/config

    docker_exec kubectl cluster-info
    echo

    echo -n 'Waiting for cluster to be ready...'
    until ! grep --quiet 'NotReady' <(docker_exec kubectl get nodes --no-headers); do
        printf '.'
        sleep 1
    done

    echo '✔︎'
    echo

    docker_exec kubectl get nodes
    echo

    echo 'Cluster ready!'
    echo
}

install_local-path-provisioner() {
    # Remove default storage class. It will be recreated by local-path-provisioner
    docker_exec kubectl delete storageclass standard

    echo 'Installing local-path-provisioner...'
    docker_exec kubectl apply -f test/local-path-provisioner.yaml
    echo
}

install_tiller() {
     docker_exec apk add bash
     echo "Install Tillerless Helm plugin..."
     docker_exec helm init --client-only
     docker_exec helm plugin install https://github.com/rimusz/helm-tiller
     docker_exec bash -c 'echo "Starting Tiller..."; helm tiller start-ci >/dev/null 2>&1 &'
     docker_exec bash -c 'echo "Waiting Tiller to launch on 44134..."; while ! nc -z localhost 44134; do sleep 1; done; echo "Tiller launched..."'
     echo
}

install_charts() {
    echo "Starting charts install testing..."
    run_ct_container
    trap cleanup EXIT

    create_kind_cluster
    install_local-path-provisioner
    install_tiller
    docker_exec ct install --config /workdir/test/ct.yaml
    echo
}

main() {
    lint_charts
}

main