require 'caracal/core/models/base_model'
require 'caracal/core/models/link_model'
require 'caracal/core/models/text_model'
require 'caracal/errors'


module Caracal
  module Core
    module Models

      # This class encapsulates the logic needed to store and manipulate
      # paragraph data.
      #
      class ParagraphModel < BaseModel

        #-------------------------------------------------------------
        # Configuration
        #-------------------------------------------------------------

        # readers
        attr_reader :paragraph_style
        attr_reader :paragraph_align
        attr_reader :paragraph_color
        attr_reader :paragraph_size
        attr_reader :paragraph_bold
        attr_reader :paragraph_italic
        attr_reader :paragraph_underline
        attr_reader :paragraph_bgcolor

        # initialization
        def initialize(options={}, &block)
          content = options.delete(:content) { "" }
          text content, options.dup
          super options, &block
        end


        #-------------------------------------------------------------
        # Public Instance Methods
        #-------------------------------------------------------------

        #=============== GETTERS ==============================

        # .runs
        def runs
          @runs ||= []
        end

        # .run_attributes
        def run_attributes
          {
            color:      paragraph_color,
            size:       paragraph_size,
            bold:       paragraph_bold,
            italic:     paragraph_italic,
            underline:  paragraph_underline,
            bgcolor:    paragraph_bgcolor
          }
        end


        #=============== SETTERS ==============================

        # booleans
        [:bold, :italic, :underline].each do |m|
          define_method "#{ m }" do |value|
            instance_variable_set("@paragraph_#{ m }", !!value)
          end
        end

        # integers
        [:size].each do |m|
          define_method "#{ m }" do |value|
            instance_variable_set("@paragraph_#{ m }", value.to_i)
          end
        end

        # strings
        [:bgcolor, :color, :style].each do |m|
          define_method "#{ m }" do |value|
            instance_variable_set("@paragraph_#{ m }", value.to_s)
          end
        end

        # symbols
        [:align].each do |m|
          define_method "#{ m }" do |value|
            instance_variable_set("@paragraph_#{ m }", value.to_s.to_sym)
          end
        end


        #=============== SUB-METHODS ===========================

        # .br
        def br
          model = Caracal::Core::Models::LineBreakModel.new()
          runs << model
          model
        end

        # .link
        def link(*args, &block)
          options = Caracal::Utilities.extract_options!(args)
          options.merge!({ content: args[0] }) if args[0]
          options.merge!({ href:    args[1] }) if args[1]

          model = Caracal::Core::Models::LinkModel.new(options, &block)
          if model.valid?
            runs << model
          else
            raise Caracal::Errors::InvalidModelError, ':link method must receive strings for the display text and the external href.'
          end
          model
        end

        # .page
        def page
          model = Caracal::Core::Models::PageBreakModel.new({ wrap: false })
          runs << model
          model
        end

        # .text
        def text(*args, &block)
          options = Caracal::Utilities.extract_options!(args)
          options.merge!({ content: args.first }) if args.first

          model = Caracal::Core::Models::TextModel.new(options, &block)
          if model.valid?
            runs << model
          else
            raise Caracal::Errors::InvalidModelError, ':text method must receive a string for the display text.'
          end
          model
        end


        #=============== VALIDATION ===========================

        def valid?
          runs.size > 0
        end


        #-------------------------------------------------------------
        # Private Instance Methods
        #-------------------------------------------------------------
        private

        def option_keys
          [:content, :style, :align, :color, :size, :bold, :italic, :underline, :bgcolor]
        end

      end

    end
  end
end