#!/usr/bin/env ruby
# Create a templated, numbered, indexed ADR in one invocation.
#
# Usage: echo '{"title": "...", ...}' | adr-new [--root DIR]
#
# JSON input fields:
#   title       (required)  decision title
#   status      (optional)  default "Accepted"
#   date        (optional)  ISO date, default today
#   supersedes  (optional)  4-digit ID of the ADR this one supersedes
#   affected_paths, affected_components  (optional)  arrays
#   context, decision, consequences, alternatives  (optional)  section bodies
#
# Prints the created file path. Also mechanically sets superseded-by + status
# on the superseded ADR and regenerates the index.

require "json"
require "date"
require_relative "../lib/adr"

root = Dir.pwd
ARGV.each_with_index { |arg, i| root = ARGV[i + 1] if arg == "--root" }

input = JSON.parse($stdin.read)
title = input["title"].to_s.strip
abort "adr-new: 'title' is required" if title.empty?

repo = Adr::Repository.new(root: root)
abort "adr-new: #{repo.dir} is not initialized (run adr-init first)" unless Dir.exist?(repo.dir)

id = repo.next_id
template = Adr::Template.new(path: File.expand_path("../templates/adr.md", __dir__))
content = template.render(
  id: id,
  title: title,
  date: input["date"] || Date.today.iso8601,
  status: input["status"] || "Accepted",
  supersedes: input["supersedes"] ? %("#{input['supersedes']}") : nil,
  affected_paths: input["affected_paths"] || [],
  affected_components: input["affected_components"] || [],
  context: input["context"],
  decision: input["decision"],
  consequences: input["consequences"],
  alternatives: input["alternatives"]
)

path = File.join(repo.dir, "#{id}-#{Adr.slugify(title)}.md")
File.write(path, content)

if (old_id = input["supersedes"])
  entry = repo.find(old_id.to_s)
  abort "adr-new: superseded ADR #{old_id} not found" unless entry
  entry.record.supersede_with(id)
  repo.write_entry(entry)
end

Adr::Index.new(repository: repo).regenerate!
puts path