require "optparse"

module Picop
  class CLI
    def self.run(argv = ARGV)
      command = argv.shift
      case command
      when 'scan'
        options = {}
        OptionParser.new do |opts|
          opts.banner = "Usage: picop scan [options] DIRECTORY"
          opts.on('-v', '--verbose', 'Run verbosely') { |v| options[:verbose] = v }
        end.parse!(argv)

        dir = argv.first || '.'
        Picop::Scanner.scan(dir, options)

      when 'sign'
        OptionParser.new do |opts|
          opts.banner = "Usage: picop sign FILE"
        end.parse!(argv)

        file = argv.first
        Picop::SourceFile.new(file).sign

      when 'checksum'
        OptionParser.new do |opts|
          opts.banner = "Usage: picop checksum FILE"
        end.parse!(argv)
        file = argv.first
        puts Picop::SourceFile.new(file).checksum

      when 'verify'
        OptionParser.new do |opts|
          opts.banner = "Usage: picop sign FILE"
        end.parse!(argv)

        path = argv.first
        source = SourceFile.new(path)

        if source.metadata['content_checksum'].nil?
          puts "⚠️  No checksum found in #{path}"
          puts "Run 'picop sign #{path}' to add one"
          exit 1
        end

        unless source.verify
          puts "❌ Checksum verification failed for #{path}"
          puts "Expected: #{source.metadata['content_checksum']}"
          puts "Got:      #{source.checksum}"
          exit 1
        end
  
        puts "✅ #{path} verified successfully"

      when 'show'
        OptionParser.new do |opts|
          opts.banner = "Usage: picop show FILE|DIRECTORY"
        end.parse!(argv)

        path = argv.first
        Picop.show(path)

      when 'update'
        options = {}
        OptionParser.new do |opts|
          opts.banner = "Usage: picop update [options] FILE"
          opts.on('-f', '--force', 'Force update') { |f| options[:force] = f }
        end.parse!(argv)

        file = argv.first
        Picop.update(file, options)

      else
        puts "Unknown command: #{command}"
        puts "Available commands: scan, sign, show, update"
        exit 1
      end
    rescue OptionParser::InvalidOption => e
      puts e.message
      exit 1
    rescue => e
      puts "Error: #{e.message}"
      puts e.backtrace if ENV['DEBUG']
      exit 1
    end
  end
end