#!/bin/bash

# Converts the README to the README in the signalfx-agent directory of the
# integrations repo, using the special structure that signalview parses to
# display in the integration tile.

set -euo pipefail

SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
AGENT_REPO_BASE="$SCRIPT_DIR/../.."
INTEGRATIONS_REPO_PATH=${INTEGRATIONS_REPO_PATH:-$SCRIPT_DIR/../../../integrations}

. $SCRIPT_DIR/common.sh

to_upper_case() {
  tr '[:lower:]' '[:upper:]'
}

[ -d $INTEGRATIONS_REPO_PATH ] || \
  (echo "integrations repo dir cannot be found at $INTEGRATIONS_REPO_PATH; please set \$INTEGRATIONS_REPO_PATH" && exit 1)

# Convert all relative links to be absolute to the Github repo url.
convert_relative_links() {
  sed -E -e 's@\]\(\./([a-zA-Z].*)\)@](https://github.com/signalfx/signalfx-agent/tree/master/\1)@'
}

uppercase_l2_headers() {
  perl -p -e 's/^## (.*)$/## \U$1/'
}

increase_all_header_level() {
  perl -p -e 's/^(#+) /$1# /'
}

strip_toc() {
  sed -Ee '/^ - \[.*\](.*)$/d'
}

convert_link_target() {
  perl -00p -e 's/\[(.+?)\]\((http.+?)\)/<a target="_blank" href="\2">\1<\/a>/gsm'
}

write_doc() {
  printf "# ![](https://github.com/signalfx/integrations/blob/master/signalfx-agent/img/integration_smartagent.png) SignalFx Smart Agent\n\n"
  printf "<!-- Generated by scripts/docs/to-integrations-repo in signalfx-agent repo. DO NOT EDIT in the integrations repo!! -->\n\n"

cat <<EOH
### DESCRIPTION

See <a target="_blank" href="https://github.com/signalfx/signalfx-agent">the Github repo</a> for the
source code along with more extensive documentation.
EOH

  cat $AGENT_REPO_BASE/README.md | \
      strip_toc | \
      use_marketing_name | \
      sed -e '/# SignalFx SmartAgent/d' | \
      sed -e '/GoDoc/d' | \
      sed -e '/CircleCI/d' | \
      sed -e '/## Concepts/d' | \
      uppercase_l2_headers | \
      increase_all_header_level | \
      convert_relative_links | \
      convert_link_target
}

write_doc | tee $INTEGRATIONS_REPO_PATH/signalfx-agent/README.md