require 'pluginscan/reports/issues_report/issues_scanner/file_issues_scanner'
require 'pluginscan/reports/issues_report/issues_scanner/line_issues_scanner'
require 'pluginscan/reports/issues_report/issues_scanner/utf8_checker'
require 'pluginscan/reports/issues_report/issues_models/check_findings'
require 'pluginscan/reports/issues_report/issues_models/issues'

module Pluginscan
  class IssuesScanner
    def initialize(checks)
      file_issues_scanner = FileIssuesScanner.new(checks)
      @file_scanner = FileScanner.new(file_issues_scanner)
    end

    def scan(files)
      issues = scan_files(files)

      Issues.new(issues)
    end

  private

    def scan_files(file_paths)
      file_paths.inject({}) do |issues, file_path|
        issues.merge file_path => scan_file(file_path)
      end
    end

    def scan_file(file_path)
      file_contents = File.read(file_path)
      @file_scanner.scan(file_contents)
    end
  end

  # Responsible for checking that a file's contents is valid
  # and if so, running an issues scan on it
  class FileScanner
    def initialize(issues_scanner)
      @issues_scanner = issues_scanner
    end

    def scan(file_contents)
      # Check file contents are valid UTF-8 to avoid exceptions later
      invalid_utf8 = UTF8Checker.new.check(file_contents)
      return Array(invalid_utf8) if invalid_utf8

      @issues_scanner.scan(file_contents)
    end
  end
end