#!/usr/bin/env bash
#  vim:ts=4:sts=4:sw=4:et
#
#  Author: Hari Sekhon
#  Date: 2021-02-25 10:10:53 +0000 (Thu, 25 Feb 2021)
#
#  https://github.com/HariSekhon/DevOps-Bash-tools
#
#  License: see accompanying Hari Sekhon LICENSE file
#
#  If you're using my code you're welcome to connect with me on LinkedIn and optionally send me feedback to help steer this or other code I publish
#
#  https://www.linkedin.com/in/HariSekhon
#

# ============================================================================ #
#                       K u b e r n e t e s   D i r e n v
# ============================================================================ #

# https://direnv.net/man/direnv-stdlib.1.html

# See Also:
#
#   .envrc
#   .envrc-aws
#   .envrc-gcp

# direnv stdlib - loads .envrc from parent dir up to /
#
# useful to accumulate parent and child directory .envrc settings eg. adding Kubernetes namespace, ArgoCD app etc.
#
# bypasses security authorization though - use with care
#source_up
#
# source_up must be loaded before set -u otherwise gets this error:
#
#   direnv: loading .envrc
#   /bin/bash: line 226: $1: unbound variable

set -euo pipefail
[ -n "${DEBUG:-}" ] && set -x

if [ "$1" = "${BASH_SOURCE[0]##*/}" ]; then
    shift
fi

# XXX: Edit this - hardcode for localized convenience
CONTEXT="${1:-docker-desktop}"
# if set will also set the namespace for extra convenience
NAMESPACE="${2:-}"
#NAMESPACE="jenkins"

if command -v kubectl &>/dev/null; then
    tmpdir="/tmp/.kube"

    mkdir -pv "$tmpdir"

    default_kubeconfig="${HOME:-$(cd ~ && pwd)}/.kube/config"
    original_kubeconfig="${KUBECONFIG:-$default_kubeconfig}"

    # reload safety - do not source from new tmpdir - not necessary for direnv but useful for local sourcing tests
    #if [[ "$original_kubeconfig" =~ $tmpdir ]]; then
    #    echo "ignoring \$KUBECONFIG=$original_kubeconfig, using default home location $default_kubeconfig"
    #    original_kubeconfig="$default_kubeconfig"
    #fi

    # isolate the kubernetes context to avoid a race condition affecting any other shells or scripts
    # epoch is added because $$ and $PPID are direnv sub-processes and may be reused later, so using epoch to add uniqueness
    epoch="$(date +%s)"
    export KUBECONFIG="$tmpdir/config.${EUID:-${UID:-$(id -u)}}.$$.$epoch"

    # load your real kube config to isolated staging area to source the context info
    if [ -f "$original_kubeconfig" ]; then
        cp "$original_kubeconfig" "$KUBECONFIG"
    elif [ -f "$default_kubeconfig" ]; then
        cp "$default_kubeconfig" "$KUBECONFIG"
    elif [ -f "$PWD/.kube/config" ]; then
        cp "$PWD/.kube/config" "$KUBECONFIG"
    else
        echo "WARNING: failed to find one of:

        $original_kubeconfig
        $default_kubeconfig
        $PWD/.kube/config
    " >&2
    fi

    if kubectl config get-contexts -o name 2>/dev/null | grep -Fxq "$CONTEXT"; then
        kubectl config use-context "$CONTEXT"

        if [ -n "${NAMESPACE:-}" ]; then
            kubectl config set-context "$CONTEXT" --namespace "$NAMESPACE"
        fi
    fi
fi

#export ARGOCD_SERVER="argocd.mycompany.com"
#export ARGOCD_OPTS="${ARGOCD_OPTS:-} --grpc-web"
#if [ -n "${ARGOCD_AUTH_TOKEN_MYCOMPANY_OR_ENV:-}" ]; then
#    export ARGOCD_AUTH_TOKEN="$ARGOCD_AUTH_TOKEN_MYCOMPANY_OR_ENV"
#fi
#export ARGOCD_APP="myapp"