# frozen_string_literal: true

module Notare
  module Builder
    def p(text = nil, style: nil, &block)
      para = Nodes::Paragraph.new(style: resolve_style(style))
      if block
        with_target(para, &block)
      elsif text
        para.add_run(Nodes::Run.new(text, **current_formatting))
      end
      @nodes << para
    end

    def text(value, style: nil)
      formatting = current_formatting.merge(style: resolve_style(style))
      @current_target.add_run(Nodes::Run.new(value, **formatting))
    end

    # Heading shortcuts
    def h1(text = nil, &block)
      p(text, style: :heading1, &block)
    end

    def h2(text = nil, &block)
      p(text, style: :heading2, &block)
    end

    def h3(text = nil, &block)
      p(text, style: :heading3, &block)
    end

    def h4(text = nil, &block)
      p(text, style: :heading4, &block)
    end

    def h5(text = nil, &block)
      p(text, style: :heading5, &block)
    end

    def h6(text = nil, &block)
      p(text, style: :heading6, &block)
    end

    def image(path, width: nil, height: nil)
      validate_image_path!(path)
      img = register_image(path, width: width, height: height)
      @current_target.add_run(img)
    end

    def b(&block)
      with_format(:bold, &block)
    end

    def i(&block)
      with_format(:italic, &block)
    end

    def u(&block)
      with_format(:underline, &block)
    end

    def s(&block)
      with_format(:strike, &block)
    end

    def br
      @current_target.add_run(Nodes::Break.new(type: :line))
    end

    def page_break
      @nodes << Nodes::Break.new(type: :page)
    end

    def link(url, text = nil, &block)
      hyperlink = register_hyperlink(url)
      if block
        with_target(hyperlink, &block)
      elsif text
        hyperlink.add_run(Nodes::Run.new(text, underline: true, color: "0000FF"))
      else
        hyperlink.add_run(Nodes::Run.new(url, underline: true, color: "0000FF"))
      end
      @current_target.add_run(hyperlink)
    end

    def ul(&block)
      list(:bullet, &block)
    end

    def ol(&block)
      list(:number, &block)
    end

    def li(text = nil, &block)
      current_type = @list_type_stack.last
      item = Nodes::ListItem.new([], list_type: current_type, num_id: @current_list.num_id, level: @list_level)
      item.add_run(Nodes::Run.new(text, **current_formatting)) if text
      with_target(item, &block) if block
      @current_list.add_item(item)
    end

    def table(style: nil, &block)
      tbl = Nodes::Table.new(style: resolve_table_style(style))
      previous_table = @current_table
      @current_table = tbl
      block.call
      @current_table = previous_table
      @nodes << tbl
    end

    def tr(&block)
      row = Nodes::TableRow.new
      previous_row = @current_row
      @current_row = row
      block.call
      @current_row = previous_row
      @current_table.add_row(row)
    end

    def td(text = nil, &block)
      cell = Nodes::TableCell.new
      if block
        with_target(cell, &block)
      elsif text
        cell.add_run(Nodes::Run.new(text, **current_formatting))
      end
      @current_row.add_cell(cell)
    end

    private

    def list(type, &block)
      @num_id_counter ||= 0
      @list_level ||= 0
      @list_type_stack ||= []

      previous_list = @current_list
      nested = !previous_list.nil?

      if nested
        # Nested list: reuse parent list, push new type, increment level
        @list_level += 1
        @list_type_stack.push(type)
        block.call
        @list_type_stack.pop
        @list_level -= 1
      else
        # Top-level list: new List node
        @num_id_counter += 1
        mark_has_lists!
        list_node = Nodes::List.new(type: type, num_id: @num_id_counter)
        @list_type_stack.push(type)
        @current_list = list_node
        block.call
        @current_list = previous_list
        @list_type_stack.pop
        @nodes << list_node
      end
    end

    def with_format(format, &block)
      @format_stack ||= []
      @format_stack.push(format)
      block.call
      @format_stack.pop
    end

    def with_target(target, &block)
      previous_target = @current_target
      @current_target = target
      block.call
      @current_target = previous_target
    end

    def current_formatting
      @format_stack ||= []
      {
        bold: @format_stack.include?(:bold),
        italic: @format_stack.include?(:italic),
        underline: @format_stack.include?(:underline),
        strike: @format_stack.include?(:strike)
      }
    end

    def validate_image_path!(path)
      raise ArgumentError, "Image file not found: #{path}" unless File.exist?(path)

      ext = File.extname(path).downcase
      return if %w[.png .jpg .jpeg].include?(ext)

      raise ArgumentError, "Unsupported image format: #{ext}. Use PNG or JPEG."
    end

    def resolve_style(style_or_name)
      return nil if style_or_name.nil?
      return style_or_name if style_or_name.is_a?(Style)

      style(style_or_name) || raise(ArgumentError, "Unknown style: #{style_or_name}")
    end

    def resolve_table_style(style_or_name)
      return nil if style_or_name.nil?
      return style_or_name if style_or_name.is_a?(TableStyle)

      table_style(style_or_name) || raise(ArgumentError, "Unknown table style: #{style_or_name}")
    end
  end
end