.function

#!/bin/bash

function setup_config_directory() {
    local directory="$1"
    local env_leave_file="${directory}/.env.leave"
    local file="${directory}/kubeconfig"

    if [[ ! -L "$env_leave_file" ]]; then
        ln -s "${directory}/../.env.leave" "$env_leave_file"
    fi

    # check config is working
    if ! kubectl --kubeconfig="$file" version >/dev/null 2>&1 ; then
        echo "ERROR: This is not valid kubeconfig!: $file " >&2
    else
        local config
        # get cluster and user name
	if [[ "$SHELL" == "/bin/zsh" ]]; then
            IFS=' ' read -rA config <<< "$(kubectl config --kubeconfig="$file" view -o go-template='{{ (index .clusters 0).name }} {{ (index .users 0).name }}')"
	else
            IFS=' ' read -ra config <<< "$(kubectl config --kubeconfig="$file" view -o go-template='{{ (index .clusters 0).name }} {{ (index .users 0).name }}')"
	fi

        # is this default config?
        if [[ "${config[0]}" == "kubernetes" ]] && \
            { [[ "${config[1]}" == "kubernetes-admin" ]] || \
             [[ "${config[1]}" == "cluster-admin" ]]; }; then

            local config_name="${directory##*/}"

            echo "Change to distinguishable config for $config_name"
            echo

            echo "Current config will back up to $file.bak"
            cp "$file" "$file".bak

            local old_cluster_name="${config[0]}"
            local old_user_name="${config[1]}"

            local cluster_name="$old_cluster_name-$config_name"
            local user_name="$old_user_name-$config_name"

            # copy cluster information
            # shellcheck disable=SC2016
            for i in $(kubectl config --kubeconfig="$file" view --raw -o go-template='{{ range $key, $value := ((index .clusters 0).cluster) }}{{ printf "%s\n" $key }}{{ end }}'); do
                local value
                value=$(kubectl config --kubeconfig="$file" view --raw -o go-template="{{ index ((index .clusters 0).cluster) \"$i\" }}")
                kubectl config --kubeconfig="$file" set clusters."$cluster_name"."$i" "$value"
            done

            # copy user information
            # shellcheck disable=SC2016
            for i in $(kubectl config --kubeconfig="$file" view --raw -o go-template='{{ range $key, $value := ((index .users 0).user) }}{{ printf "%s\n" $key }}{{ end }}'); do
                local value
                value=$(kubectl config --kubeconfig="$file" view --raw -o go-template="{{ index ((index .users 0).user) \"$i\" }}")
                kubectl config --kubeconfig="$file" set users."$user_name"."$i" "$value"
            done

            # set context
            kubectl config --kubeconfig="$file" set-context "$user_name@$cluster_name" --cluster "$cluster_name" --user "$user_name"
            kubectl config --kubeconfig="$file" use-context "$user_name@$cluster_name"

            # delete old datas
            kubectl config --kubeconfig="$file" unset clusters."$old_cluster_name"
            kubectl config --kubeconfig="$file" unset users."$old_user_name"
            kubectl config --kubeconfig="$file" unset contexts."$old_user_name@$old_cluster_name"

            echo
        fi
    fi
}

function merge_kubeconfig() {
    if [ -z "$KUBECONFIG" ]; then
        KUBECONFIG="${HOME}/.kube/config"
    fi

    local dir
    dir="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"

    for d in $(echo "$dir"/*/); do
        setup_config_directory "${d%?}" >/dev/null 2>&1

        KUBECONFIG="$KUBECONFIG:${d}kubeconfig"
    done

    export KUBECONFIG=$KUBECONFIG

    kubectl config view --raw
    echo
}

function build_kubeconfig() {
    local KUBECONFIG
    local dir
    dir="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"

    for d in $(echo "$dir"/*/); do
        setup_config_directory "${d%?}" >/dev/null 2>&1

        KUBECONFIG="$KUBECONFIG:${d}kubeconfig"
    done

    export KUBECONFIG=$KUBECONFIG

    kubectl config view --raw
    echo
}