#!/usr/bin/env ruby
# frozen_string_literal: true

require "json"

def minor_versions(name, requirement)
  tuples, _errors = Gem::SpecFetcher.fetcher.search_for_dependency(Gem::Dependency.new(name, requirement))
  tuples.map { |tuple, _source| tuple.version.segments.first(2).join(".") }.uniq
end

ruby_activerecord_requirements = {
  "2.7" => ">= 6.0",
  "3.0" => ">= 6.0",
  "3.1" => ">= 6.0"
}

activerecord_pg_requirements = {
  "6.0" => [">= 0.18", "< 2.0"],
  "6.1" => "~> 1.1",
  "7.0" => "~> 1.1"
}

versions = ruby_activerecord_requirements.flat_map do |ruby_version, activerecord_requirement|
  minor_versions("activerecord", activerecord_requirement).flat_map do |activerecord_version|
    minor_versions("pg", activerecord_pg_requirements.fetch(activerecord_version)).map do |pg_version|
      {
        ruby: ruby_version,
        activerecord: activerecord_version,
        pg: pg_version
      }
    end
  end
end

matrix = { include: versions }

puts "::set-output name=matrix::#{matrix.to_json}"