require_relative '../base'

module Analytics
  module Serializer
    class ObjC < Base
      class UserProperty
        def initialize(src)
          @src = src
        end

				def save(path)
					@class_name = 'AnalyticsUserProperty'

          @file_name = @class_name + '.h'
          output_path = File.join(path, @file_name)
					File.write(output_path, render_h)
					
					@file_name = @class_name + '.m'
          output_path = File.join(path, @file_name)
          File.write(output_path, render_m)
        end

        private

        def render_h
          ERB.new(template_h, nil, '-').result(binding)
        end

        def template_h
					<<~TEMPLATE
            <%= ERB.new(Analytics::Templates.tmpl_at('header.erb')).result(binding) %>

            #import <Foundation/Foundation.h>
            #import "AnalyticsEnums.h"
            
            NS_ASSUME_NONNULL_BEGIN

            __swift_unavailable("This class is only available in ObjC.")
            @interface <%= @class_name %> : NSObject

            @property (nonatomic, strong, readonly) NSString *name;
            @property (nonatomic, strong, readonly, nullable) NSString *value;

            - (instancetype)init NS_UNAVAILABLE;
            + (instancetype)new NS_UNAVAILABLE;

            #pragma mark - User properties
            <% @src["userProperties"].each do |user_property| %>
            /// <%= user_property['description'] %>
            <% if user_property['values'].nil? -%>
            /// @param value The value of the user property, or `nil` if You want to remove the user property.
            <% else -%>
            /// @param value The value of the user property, or use `<%= 'AUP' + user_property['name'].pascal_case + 'Nil' %>` if You want to remove the user property.
            <% end -%>
            + (instancetype)<%= user_property['name'].camel_case %>WithValue:(<%= format_method_parameter(user_property) %>)value;
            <% end %>
            @end

            NS_ASSUME_NONNULL_END
          TEMPLATE
				end
				
				def render_m
          ERB.new(template_m, nil, '-').result(binding)
        end

        def template_m
					<<~TEMPLATE
            <%= ERB.new(Analytics::Templates.tmpl_at('header.erb')).result(binding) %>

            #import "<%= @class_name + '.h' %>"

            @implementation <%= @class_name %>
            
            - (instancetype)initWithName:(NSString *)name value:(NSString * _Nullable)value
            {
                if (self = [super init]) {
                    _name = name;
                    _value = value;
                }
                return self;
            }

            #pragma mark - User properties
            <% @src["userProperties"].each do |user_property| %>
            + (instancetype)<%= user_property['name'].camel_case %>WithValue:(<%= format_method_parameter(user_property) %>)value
            {
            <% unless user_property['values'].nil? -%>
                NSString *rawValue;
                switch (value) {
            <% user_property['values'].each do |value| -%>
                    case <%= 'AUP' + user_property['name'].pascal_case + value.pascal_case %>:
                        rawValue = @"<%= value %>";
                        break;
            <% end -%>
                    case <%= 'AUP' + user_property['name'].pascal_case + 'Nil' %>:
                        rawValue = nil;
                        break;
                }
                return [[self alloc] initWithName:@"<%= user_property['name'] %>" value:rawValue];
            <% else -%>
                return [[self alloc] initWithName:@"<%= user_property['name'] %>" value:value];
            <% end -%>
            }
						<% end %>
            @end
          TEMPLATE
        end

        def format_method_parameter(user_property)
          if user_property['values'].nil?
            "NSString * _Nullable"
          else
            'AUP' + user_property['name'].pascal_case
          end
        end
      end
    end
  end
end