# frozen_string_literal: true

require "blather"

class FormTemplate
	def initialize(template, filename="template", **kwargs)
		@args = kwargs
		@template = template
		@filename = filename
		freeze
	end

	def self.render(path, **kwargs)
		full_path = File.dirname(__dir__) + "/forms/#{path}.rb"
		new(File.read(full_path), full_path, **kwargs).render
	end

	def render(**kwargs)
		one = OneRender.new(**@args.merge(kwargs))
		one.instance_eval(@template, @filename)
		one.form
	end

	class OneRender
		def initialize(**kwargs)
			kwargs.each do |k, v|
				instance_variable_set("@#{k}", v)
			end
			@__form = Blather::Stanza::X.new
			@__builder = Nokogiri::XML::Builder.with(@__form)
		end

		def form!
			@__type_set = true
			@__form.type = :form
		end

		def result!
			@__type_set = true
			@__form.type = :result
		end

		def title(s)
			@__form.title = s
		end

		def instructions(s)
			@__form.instructions = s
		end

		def validate(field, datatype: nil, **kwargs)
			Nokogiri::XML::Builder.with(field) do |xml|
				xml.validate(
					xmlns: "http://jabber.org/protocol/xdata-validate",
					datatype: datatype || "xs:string"
				) do
					xml.basic unless validation_type(xml, **kwargs)
				end
			end
		end

		def validation_type(xml, open: false, regex: nil, range: nil)
			xml.open if open
			xml.range(min: range.first, max: range.last) if range
			xml.regex(regex.source) if regex
			open || regex || range
		end

		def field(datatype: nil, open: false, regex: nil, range: nil, **kwargs)
			f = Blather::Stanza::X::Field.new(kwargs)
			if datatype || open || regex || range
				validate(f, datatype: datatype, open: open, regex: regex, range: range)
			end
			@__form.fields += [f]
		end

		def xml
			@__builder
		end

		def form
			raise "Type never set" unless @__type_set

			@__form
		end
	end
end