require 'pdk'

module PDK
  module Validate
    module YAML
      class YAMLSyntaxValidator < InternalRubyValidator
        YAML_ALLOWLISTED_CLASSES = [Symbol].freeze

        def ignore_dotfiles
          false
        end

        def name
          'yaml-syntax'
        end

        def pattern
          [
            '**/*.yaml',
            '**/*.yml'
          ].tap do |pat|
            if context.is_a?(PDK::Context::ControlRepo)
              pat.push(
                '**/*.eyaml',
                '**/*.eyml'
              )
            else
              pat
            end
          end
        end

        def spinner_text
          format('Checking YAML syntax (%{patterns}).', patterns: pattern.join(' '))
        end

        def validate_target(report, target)
          return 0 unless PDK::Util::Filesystem.file?(target)

          unless PDK::Util::Filesystem.readable?(target)
            report.add_event(
              file: target,
              source: name,
              state: :failure,
              severity: 'error',
              message: 'Could not be read.'
            )
            return 1
          end

          begin
            ::YAML.safe_load(PDK::Util::Filesystem.read_file(target), permitted_classes: YAML_ALLOWLISTED_CLASSES, permitted_symbols: [], aliases: true)

            report.add_event(
              file: target,
              source: name,
              state: :passed,
              severity: 'ok'
            )
            0
          rescue Psych::SyntaxError => e
            report.add_event(
              file: target,
              source: name,
              state: :failure,
              severity: 'error',
              line: e.line,
              column: e.column,
              message: format('%{problem} %{context}', problem: e.problem, context: e.context)
            )
            1
          rescue Psych::DisallowedClass => e
            report.add_event(
              file: target,
              source: name,
              state: :failure,
              severity: 'error',
              message: format('Unsupported class: %{message}', message: e.message)
            )
            1
          end
        end
      end
    end
  end
end