#!/bin/bash
#
# ci/repipe
#
# Script for merging together pipeline configuration files
# (via Spruce!) and configuring Concourse.
#
# author:  James Hunt <james@niftylogic.com>
#          Dennis Bell <dennis.j.bell@gmail.com>
# created: 2016-03-04

need_command() {
	local cmd=${1:?need_command() - no command name given}

	if [[ ! -x "$(command -v $cmd)" ]]; then
		echo >&2 "${cmd} is not installed."
		if [[ "${cmd}" == "spruce" ]]; then
			echo >&2 "Please download it from https://github.com/geofffranks/spruce/releases"
		fi
		exit 2
	fi
}

NO_FLY=
SAVE_MANIFEST=
VALIDATE_PIPELINE=
NON_INTERACTIVE=

cleanup() {
    rm -f save-manifest.yml
    if [[ -n ${SAVE_MANIFEST} && -e .deploy.yml ]]; then
        mv .deploy.yml save-manifest.yml
    fi
    rm -f .deploy.yml
}

usage() {
    echo Command line arguments:
    echo "no-fly            Do not execute any fly commands"
    echo "save-manifest     Save manifest to file save-manifest"
    echo "validate          Validate pipeline instead of set pipeline"
    echo "validate-strict   Validate pipeline with strict mode"
    echo "non-interactive   Run set-pipeline in non-interactive mode"
    echo "open              Open pipeline dashboard to browser (if possible)"
}

open_pipeline() {
	url=$(show_pipeline_url)
    cleanup
	if [[ -x /usr/bin/open ]]; then
		exec /usr/bin/open "$url"
	else
		echo "Sorry, but I was not able to automagically open"
		echo "your Concourse Pipeline in the browser."
		echo
		echo "Here's a link you can click on, though:"
		echo
		echo "  $url"
		echo
		exit 0;
	fi
}

show_pipeline_url() {
	spruce merge --skip-eval pipeline.yml ${settings_file} > .deploy.yml
	concourse_url=$(spruce json .deploy.yml | jq -r ".meta.url")
	team=$(spruce json .deploy.yml | jq -r ".meta.team // \"main\"")
	pipeline=$(spruce merge --skip-eval \
		--cherry-pick meta.pipeline \
		--cherry-pick meta.name \
		.deploy.yml | spruce merge - | spruce json | jq -r ".meta.pipeline")

	echo "$concourse_url/teams/$team/pipelines/$pipeline"
	exit 0
}

for arg do
    case "${arg}" in
        no-fly|no_fly)  NO_FLY="yes" ;;
        save-manifest|save_manifest) SAVE_MANIFEST="yes" ;;
        validate) VALIDATE_PIPELINE="normal" ;;
        validate-strict|validate_strict) VALIDATE_PIPELINE="strict" ;;
        non-interactive|non_interactive) NON_INTERACTIVE="--non-interactive" ;;
        url) SHOW_PIPELINE_URL="yes" ;;
        open) OPEN_PIPELINE="yes" ;;
        help|-h|--help) usage; exit 0 ;;
        *) echo Invalid argument
            usage
            exit 1
    esac
done

cd $(dirname $BASH_SOURCE[0])
echo >&2 "Working in $(pwd)"
need_command spruce

# Allow for target-specific settings
settings_file="$(ls -1 settings.yml ${CONCOURSE_TARGET:+"settings-${CONCOURSE_TARGET}.yml"} 2>/dev/null | tail -n1)"
if [[ -z "$settings_file" ]]
then
  echo >&2 "Missing local settings in ci/settings.yml${CONCOURSE_TARGET:+" or ci/settings-${CONCOURSE_TARGET}.yml"}!"
  exit 1
fi

echo >&2 "Using settings found in ${settings_file}"

set -e
trap "cleanup" QUIT TERM EXIT INT

[[ -n ${SHOW_PIPELINE_URL} ]] && { show_pipeline_url; exit 0; }
[[ -n ${OPEN_PIPELINE} ]]     && { open_pipeline;     exit 0; }

spruce merge pipeline.yml ${settings_file} > .deploy.yml
PIPELINE=$(spruce json .deploy.yml | jq -r '.meta.pipeline // ""')
if [[ -z ${PIPELINE} ]]; then
	echo >&2 "Missing pipeline name in ci/settings.yml!"
	exit 1
fi

TARGET_FROM_SETTINGS=$(spruce json .deploy.yml | jq -r '.meta.target // ""')
if [[ -z ${CONCOURSE_TARGET} ]]; then
  TARGET=${TARGET_FROM_SETTINGS}
elif [[ "$CONCOURSE_TARGET" != "$TARGET_FROM_SETTINGS" ]]
then
  echo >&2 "Target in {$settings_file} differs from target in \$CONCOURSE_TARGET"
  echo >&2 "  \$CONCOURSE_TARGET: $CONCOURSE_TARGET"
  echo >&2 "  Target in file:    $TARGET_FROM_SETTINGS"
  exit 1
else
  TARGET=${CONCOURSE_TARGET}
fi

if [[ -z ${TARGET} ]]; then
	echo >&2 "Missing Concourse Target in ci/settings.yml!"
	exit 1
fi

fly_cmd="${FLY_CMD:-fly}"

[[ -n ${NO_FLY} ]] && { echo no fly execution requested ; exit 0; }

case "${VALIDATE_PIPELINE}" in
    normal) fly_opts="validate-pipeline" ;;
    strict) fly_opts="validate-pipeline --strict" ;;
    *) fly_opts="set-pipeline ${NON_INTERACTIVE} --pipeline ${PIPELINE}" ;;
esac

set +x
$fly_cmd --target ${TARGET} ${fly_opts} --config .deploy.yml
[[ -n ${VALIDATE_PIPELINE} ]] && exit 0
$fly_cmd --target ${TARGET} unpause-pipeline --pipeline ${PIPELINE}