#!/usr/bin/env ruby

# frozen_string_literal: true

# call for instance as:
# ./bin/changelog <to> [<from>] [<output_file>]
# for instance, for the release notes of v1.2.3:
# ./bin/changelog v1.2.3
# or
# ./bin/changelog v1.2.3 v1.2.2
#
# You may set the ENV NO_CACHE to force fetching from Github
# You should also ensure you set the ENV: GITHUB_TOKEN

require_relative '../lib/changelog'
require 'logger'

logger = Logger.new($stdout)
logger.level = Logger::DEBUG
logger.debug('Starting')

changelogerator_version = `changelogerator --version`
logger.debug(changelogerator_version)

owner = 'paritytech'
repo = 'polkadot'

gh_polkadot = SubRef.new(format('%<owner>s/%<repo>s', { owner: owner, repo: repo }))
last_release_ref = gh_polkadot.get_last_ref()

polkadot_ref2 = ARGV[0] || 'HEAD'
polkadot_ref1 = ARGV[1] || last_release_ref

output = ARGV[2] || 'release-notes.md'

ENV['REF1'] = polkadot_ref1
ENV['REF2'] = polkadot_ref2

substrate_ref1 = gh_polkadot.get_dependency_reference(polkadot_ref1, 'sp-io')
substrate_ref2 = gh_polkadot.get_dependency_reference(polkadot_ref2, 'sp-io')

logger.debug("Polkadot from:   #{polkadot_ref1}")
logger.debug("Polkadot to:     #{polkadot_ref2}")

logger.debug("Substrate from:  #{substrate_ref1}")
logger.debug("Substrate to:    #{substrate_ref2}")

substrate_data = 'substrate.json'
polkadot_data = 'polkadot.json'

logger.debug("Using SUBSTRATE: #{substrate_data}")
logger.debug("Using POLKADOT:  #{polkadot_data}")

logger.warn('NO_CACHE set') if ENV['NO_CACHE']

if ENV['NO_CACHE'] || !File.file?(polkadot_data)
  logger.debug(format('Fetching data for Polkadot into %s', polkadot_data))
  cmd = format('changelogerator %<owner>s/%<repo>s -f %<from>s -t %<to>s > %<output>s',
               { owner: owner, repo: 'polkadot', from: polkadot_ref1, to: polkadot_ref2, output: polkadot_data })
  system(cmd)
else
  logger.debug("Re-using:#{polkadot_data}")
end

if ENV['NO_CACHE'] || !File.file?(substrate_data)
  logger.debug(format('Fetching data for Substrate into %s', substrate_data))
  cmd = format('changelogerator %<owner>s/%<repo>s -f %<from>s -t %<to>s > %<output>s',
               { owner: owner, repo: 'substrate', from: substrate_ref1, to: substrate_ref2, output: substrate_data })
  system(cmd)
else
  logger.debug("Re-using:#{substrate_data}")
end

KUSAMA_DIGEST = ENV['KUSAMA_DIGEST'] || 'digests/kusama_srtool_output.json'
WESTEND_DIGEST = ENV['WESTEND_DIGEST'] || 'digests/westend_srtool_output.json'
ROCOCO_DIGEST = ENV['ROCOCO_DIGEST'] || 'digests/rococo_srtool_output.json'
POLKADOT_DIGEST = ENV['POLKADOT_DIGEST'] || 'digests/polkadot_srtool_output.json'

# Here we compose all the pieces together into one
# single big json file.
cmd = format('jq \
    --slurpfile substrate %s \
    --slurpfile polkadot %s \
    --slurpfile srtool_kusama %s \
    --slurpfile srtool_westend %s \
    --slurpfile srtool_rococo %s \
    --slurpfile srtool_polkadot %s \
    -n \'{
            substrate: $substrate[0],
            polkadot: $polkadot[0],
        srtool: [
        { name: "kusama", data: $srtool_kusama[0] },
        { name: "westend", data: $srtool_westend[0] },
        { name: "rococo", data: $srtool_rococo[0] },
        { name: "polkadot", data: $srtool_polkadot[0] }
    ] }\' > context.json', substrate_data, polkadot_data,
             KUSAMA_DIGEST,
             WESTEND_DIGEST,
             ROCOCO_DIGEST,
             POLKADOT_DIGEST)
system(cmd)

cmd = format('tera --env --env-key env --include-path templates \
        --template templates/template.md.tera context.json > %s', output)
system(cmd)