require 'tempfile'

class Pry
  module DefaultCommands

    Introspection = Pry::CommandSet.new do

      command "show-method", "Show the source for METH. Type `show-method --help` for more info. Aliases: $, show-source" do |*args|
        target = target()

        opts = Slop.parse!(args) do |opt|
          opt.banner unindent <<-USAGE
            Usage: show-method [OPTIONS] [METH 1] [METH 2] [METH N]
            Show the source for method METH. Tries instance methods first and then methods by default.
            e.g: show-method hello_method
          USAGE

          opt.on :l, "line-numbers", "Show line numbers."
          opt.on :b, "base-one", "Show line numbers but start numbering at 1 (useful for `amend-line` and `play` commands)."

          opt.on :M, "instance-methods", "Operate on instance methods."
          opt.on :m, :methods, "Operate on methods."
          opt.on :f, :flood, "Do not use a pager to view text longer than one screen."
          opt.on :c, :context, "Select object context to run under.", true do |context|
            target = Pry.binding_for(target.eval(context))
          end
          opt.on :h, :help, "This message." do
            output.puts opt
          end
        end
        next if opts.help?
        opts[:instance] = opts['instance-methods'] if opts.m?

        args = [nil] if args.empty?
        args.each do |method_name|
          begin
            meth = get_method_or_raise(method_name, target, opts.to_hash(true))
          rescue CommandError => e
            puts "\nError: #{e.message}"
            next
          end
          next unless meth.source

          output.puts make_header(meth)
          if Pry.color
            code = CodeRay.scan(meth.source, meth.source_type).term
          else
            code = meth.source
          end

          start_line = false
          if opts.b?
            start_line = 1
          elsif opts.l?
            start_line = meth.source_line || 1
          end

          render_output(opts.flood?, start_line, code)
          code
        end
      end

      alias_command "show-source", "show-method"
      alias_command "$", "show-method"

      command "show-command", "Show the source for CMD. Type `show-command --help` for more info." do |*args|
        target = target()

        opts = Slop.parse!(args) do |opt|
          opt.banner unindent <<-USAGE
            Usage: show-command [OPTIONS] [CMD]
            Show the source for command CMD.
            e.g: show-command show-method
          USAGE

          opt.on :l, "line-numbers", "Show line numbers."
          opt.on :f, :flood, "Do not use a pager to view text longer than one screen."
          opt.on :h, :help, "This message." do
            output.puts opt
          end
        end

        next if opts.help?

        command_name = args.shift
        if !command_name
          raise CommandError, "You must provide a command name."
        end

        if find_command(command_name)
          block = Pry::Method.new(find_command(command_name).block)

          next unless block.source
          set_file_and_dir_locals(block.source_file)

          output.puts make_header(block)

          if Pry.color
            code = CodeRay.scan(block.source, :ruby).term
          else
            code = block.source
          end

          start_line = false
          if opts.l?
            start_line = block.source_line || 1
          end

          render_output(opts.flood?, opts.l? ? block.source_line : false, code)
          code
        else
          raise CommandError, "No such command: #{command_name}."
        end
      end

      command "edit", "Invoke the default editor on a file. Type `edit --help` for more info" do |*args|
        opts = Slop.parse!(args) do |opt|
          opt.banner unindent <<-USAGE
            Usage: edit [--no-reload|--reload] [--line LINE] [--temp|--ex|FILE[:LINE]|--in N]
            Open a text editor. When no FILE is given, edits the pry input buffer.
            Ensure #{text.bold("Pry.config.editor")} is set to your editor of choice.
            e.g: edit sample.rb
          USAGE

          opt.on :e, :ex, "Open the file that raised the most recent exception (_ex_.file)", :optional => true, :as => Integer
          opt.on :i, :in, "Open a temporary file containing the Nth line of _in_. N may be a range.", :optional => true, :as => Range, :default => -1..-1
          opt.on :t, :temp, "Open an empty temporary file"
          opt.on :l, :line, "Jump to this line in the opened file", true, :as => Integer
          opt.on :n, :"no-reload", "Don't automatically reload the edited code"
          opt.on :r, :reload, "Reload the edited code immediately (default for ruby files)"
          opt.on :h, :help, "This message." do
            output.puts opt
          end
        end
        next if opts.h?

        if [opts.ex?, opts.t?, opts.in?, !args.empty?].count(true) > 1
          raise CommandError, "Only one of --ex, --temp, --in and FILE may be specified."
        end

        # edit of local code, eval'd within pry.
        if !opts.ex? && args.empty?

          content = if opts.t?
                      ""
                    elsif opts.i?
                      case opts[:i]
                      when Range
                        (_pry_.input_array[opts[:i]] || []).join
                      when Fixnum
                        _pry_.input_array[opts[:i]] || ""
                      else
                        next output.puts "Not a valid range: #{opts[:i]}"
                      end
                    elsif eval_string.strip != ""
                      eval_string
                    else
                      _pry_.input_array.reverse_each.find{ |x| x && x.strip != "" } || ""
                    end

          line = content.lines.count

          temp_file do |f|
            f.puts(content)
            f.flush
            invoke_editor(f.path, line)
            if !opts.n?
              silence_warnings do
                eval_string.replace(File.read(f.path))
              end
            end
          end

        # edit of remote code, eval'd at top-level
        else
          if opts.ex?
            if _pry_.last_exception.nil?
              raise CommandError, "No exception found."
            end

            ex = _pry_.last_exception
            bt_index = opts[:ex].to_i

            ex_file, ex_line = ex.bt_source_location_for(bt_index)
            if ex_file && RbxPath.is_core_path?(ex_file)
              file_name = RbxPath.convert_path_to_full(ex_file)
            else
              file_name = ex_file
            end

            line = ex_line

            if file_name.nil?
              raise CommandError, "Exception has no associated file."
            end

            if Pry.eval_path == file_name
              raise CommandError, "Cannot edit exceptions raised in REPL."
            end
          else
            # break up into file:line
            file_name = File.expand_path(args.first)

            line = file_name.sub!(/:(\d+)$/, "") ? $1.to_i : 1
          end

          line = opts[:l].to_i if opts.l?

          invoke_editor(file_name, line)
          set_file_and_dir_locals(file_name)

          if opts.r? || ((opts.ex? || file_name.end_with?(".rb")) && !opts.n?)
            silence_warnings do
              TOPLEVEL_BINDING.eval(File.read(file_name), file_name)
            end
          end
        end
      end

      command "edit-method", "Edit a method. Type `edit-method --help` for more info." do |*args|
        target = target()

        opts = Slop.parse!(args) do |opt|
          opt.banner unindent <<-USAGE
            Usage: edit-method [OPTIONS] [METH]
            Edit the method METH in an editor.
            Ensure #{text.bold("Pry.config.editor")} is set to your editor of choice.
            e.g: edit-method hello_method
          USAGE

          opt.on :M, "instance-methods", "Operate on instance methods."
          opt.on :m, :methods, "Operate on methods."
          opt.on :n, "no-reload", "Do not automatically reload the method's file after editing."
          opt.on "no-jump", "Do not fast forward editor to first line of method."
          opt.on :p, :patch, "Instead of editing the method's file, try to edit in a tempfile and apply as a monkey patch."
          opt.on :c, :context, "Select object context to run under.", true do |context|
            target = Pry.binding_for(target.eval(context))
          end
          opt.on :h, :help, "This message." do
            output.puts opt
          end
        end
        next if opts.help?

        if !Pry.config.editor
          raise CommandError, "No editor set!\nEnsure that #{text.bold("Pry.config.editor")} is set to your editor of choice."
        end

        meth = get_method_or_raise(args.shift, target, opts.to_hash(true))

        if opts.p? || meth.dynamically_defined?
          lines = meth.source.lines.to_a

          if lines[0] =~ /^def [^( \n]+/
            lines[0] = "def #{meth.name}#{$'}"
          else
            raise CommandError, "Pry can only patch methods created with the `def` keyword."
          end

          temp_file do |f|
            f.puts lines.join
            f.flush
            invoke_editor(f.path, 0)
            Pry.new(:input => StringIO.new(File.read(f.path))).rep(meth.owner)
          end
          next
        end

        if meth.source_type == :c
          raise CommandError, "Can't edit a C method."
        else
          file, line = meth.source_file, meth.source_line

          invoke_editor(file, opts["no-jump"] ? 0 : line)
          silence_warnings do
            load file if !opts.n? && !Pry.config.disable_auto_reload
          end
        end
      end

    end
  end
end