# Updated 10/17 Alec Cunningham
# Required resources for kubernetes
# kubectl create secret generic cloudsql-oauth-credentials --from-file=creds/db-access.json
# kubectl create secret generic --from-literal=username=root --from-literal=password=root
# kubectl create configmap settings --from-file=config/configmap.yaml

# Used for PROJECT_ID
GCLOUD_PROJECT = container-builder-186003
# GRC URL
REPO := gcr.io/$(GCLOUD_PROJECT)/
# Docker image name
IMAGE = gke-tut
# Latest commit SHA for tagging
COMMIT := $(shell git log -1 --format=%h)
# The final release artifact docker image
COMMIT_IMAGE := $(REPO)$(IMAGE):$(COMMIT)
# GKE cluster name
CLUSTER := $(IMAGE)
# Variable of all manifests in all $DIRS
DIRS = $(wildcard manifests/*)
DPLY = manifests/deployment.yaml
OBJS = $(notdir $(DIRS))
# Holds envsubst'd templates
TMPL = .generated
CLEAN = rm -rf $(TMP)
# Output colors
GREEN  := $(shell tput -Txterm setaf 2)
WHITE  := $(shell tput -Txterm setaf 7)
YELLOW := $(shell tput -Txterm setaf 3)
RESET  := $(shell tput -Txterm sgr0)

# Help script
HELP_FUN = \
	%help; \
	while(<>) { push @{$$help{$$2 // 'options'}}, [$$1, $$3] if /^([a-zA-Z\-]+)\s*:.*\#\#(?:@([a-zA-Z\-]+))?\s(.*)$$/ }; \
	print "usage: make [target]\n\n"; \
	print "see makefile for additional commands\n\n"; \
	for (sort keys %help) { \
	print "${WHITE}$$_:${RESET}\n"; \
	for (@{$$help{$$_}}) { $$sep = " " x (32 - length $$_->[0]); \
	print "  ${YELLOW}$$_->[0]${RESET}$$sep${GREEN}$$_->[1]${RESET}\n"; \
	}; print "\n"; }

help: ## Show help (same if no target is specified).
	@perl -e '$(HELP_FUN)' $(MAKEFILE_LIST)

# Prints value of variable
print-%  : ; @echo $* = $($*)

.PHONY: all
all:
	make help

.PHONY: authenticate
authenticate: ## Authenticate with GCP and set kubectl context
	@echo You must be signed in for this to work!
	gcloud config set project $(GCLOUD_PROJECT)
	# Get kubectl context
	gcloud container clusters get-credentials $(CLUSTER)

.PHONY: source
source: ## Grab env variables
	. .env

.PHONY: list.manifests
list.manifests: ##@ List all manifests in $OBJS
	@echo $(OBJS);

.PHONY: build
build:  ##@docker Build base $IMAGE
	docker build -t $(IMAGE) .

.PHONY: tag
tag: ##@docker Tag $IMAGE with 'latest' and $COMMIT
	docker tag $(IMAGE) $(COMMIT_IMAGE)
	docker tag $(IMAGE) $(REPO)$(IMAGE):latest

push: build tag ##@docker Push release image to GCP registry
	gcloud docker -- push $(COMMIT_IMAGE)
	gcloud docker -- push $(REPO)$(IMAGE):latest

template: template.reset ##@manifests Replace environment variables
	$(foreach var,$(OBJS),envsubst < manifests/$(var) > $(TMPL)/$(var);)
	echo manifests in $(TMPL)

.PHONY: template.reset
template.reset: ##@manifests Reset .generated
	if [ -d $(TMPL) ]; then rm -Rf $(TMPL); fi
	mkdir $(TMPL) && cd $(TMPL) && touch $(OBJS)

update.deployment: template ##@manifests Only update manifests
	kubectl apply -f $(TMPL)
	$(CLEAN)

update.image: push ##@kubectl Set deployments image to $COMMIT
	$(foreach var,$(DPLY),kubectl set image deployment/$(var) \
		$(IMAGE)=$(COMMIT_IMAGE);)
	$(CLEAN)

.PHONY: update.config
update.config: ##@kubectl Replace ini ConfigMap
	kubectl replace configmap gke-settings --from-file=$(CONFIG)

.PHONY: delete.deployment
delete.deployment: ##@kubectl Delete all deployments
	$(foreach var,$(OBJS),kubectl delete deployment $(var);)

.PHONY: delete.service
delete.service: ##@kubectl Delete all services
	$(foreach var,$(OBJS),kubectl delete service $(var);)

delete: delete.deployment delete.service ##@kubectl Delete all resources
	kubectl delete pods --all