# frozen_string_literal: true

class Wizard
  class Builder

    def initialize(user)
      @wizard = Wizard.new(user)
    end

    def build
      return @wizard unless SiteSetting.wizard_enabled? && @wizard.user.try(:staff?)

      @wizard.append_step('introduction') do |step|
        step.banner = "welcome-illustration.svg"

        step.add_field(id: 'title', type: 'text', required: true, value: SiteSetting.title)
        step.add_field(id: 'site_description', type: 'text', required: false, value: SiteSetting.site_description)
        step.add_field(id: 'contact_email', type: 'text', required: true, value: SiteSetting.contact_email)

        languages = step.add_field(id: 'default_locale',
                                   type: 'dropdown',
                                   required: true,
                                   value: SiteSetting.default_locale)

        LocaleSiteSetting.values.each do |locale|
          languages.add_choice(locale[:value], label: locale[:name])
        end

        step.on_update do |updater|
          updater.ensure_changed(:title)

          if updater.errors.blank?
            updater.apply_settings(:title, :site_description, :contact_email)
          end

          old_locale = SiteSetting.default_locale
          updater.apply_setting(:default_locale)

          if old_locale != updater.fields[:default_locale]
            Scheduler::Defer.later "Reseed" do
              SeedData::Categories.with_default_locale.update(skip_changed: true)
              SeedData::Topics.with_default_locale.update(skip_changed: true)
            end

            updater.refresh_required = true
          end
        end
      end

      @wizard.append_step('privacy') do |step|
        step.banner = "members-illustration.svg"
        step.add_field(
          id: 'login_required',
          type: 'checkbox',
          icon: 'unlock',
          value: SiteSetting.login_required
        )

        step.add_field(
          id: 'invite_only',
          type: 'checkbox',
          icon: 'user-plus',
          value: SiteSetting.invite_only
        )

        step.add_field(
          id: 'must_approve_users',
          type: 'checkbox',
          icon: 'user-shield',
          value: SiteSetting.must_approve_users
        )

        step.on_update do |updater|
          updater.update_setting(:login_required, updater.fields[:login_required])
          updater.update_setting(:invite_only, updater.fields[:invite_only])
          updater.update_setting(:must_approve_users, updater.fields[:must_approve_users])
        end
      end

      @wizard.append_step('ready') do |step|
        # no form on this page, just info.
        step.banner = "finished-illustration.svg"
      end

      @wizard.append_step('styling') do |step|
        default_theme = Theme.find_by(id: SiteSetting.default_theme_id)
        default_theme_override = SiteSetting.exists?(name: "default_theme_id")

        base_scheme = default_theme&.color_scheme&.base_scheme_id
        color_scheme_name = default_theme&.color_scheme&.name

        scheme_id = default_theme_override ? (base_scheme || color_scheme_name) : ColorScheme::LIGHT_THEME_ID

        themes = step.add_field(
          id: 'color_scheme',
          type: 'dropdown',
          required: !default_theme_override,
          value: scheme_id || ColorScheme::LIGHT_THEME_ID,
          show_in_sidebar: true
        )

        # fix for the case when base_scheme is nil
        if scheme_id && default_theme_override && base_scheme.nil?
          scheme = default_theme.color_scheme
          themes.add_choice(scheme_id, data: { colors: scheme.colors_hashes })
        end

        ColorScheme.base_color_scheme_colors.each do |t|
          themes.add_choice(t[:id], data: { colors: t[:colors] })
        end

        body_font = step.add_field(
          id: 'body_font',
          type: 'dropdown',
          value: SiteSetting.base_font,
          show_in_sidebar: true
        )

        heading_font = step.add_field(
          id: 'heading_font',
          type: 'dropdown',
          value: SiteSetting.heading_font,
          show_in_sidebar: true
        )

        DiscourseFonts.fonts.each do |font|
          body_font.add_choice(font[:key], label: font[:name])
          heading_font.add_choice(font[:key], label: font[:name])
        end

        current = SiteSetting.top_menu.starts_with?("categories") ? SiteSetting.desktop_category_page_style : "latest"
        style = step.add_field(id: 'homepage_style', type: 'dropdown', required: true, value: current, show_in_sidebar: true)
        style.add_choice('latest')
        CategoryPageStyle.values.each do |page|
          style.add_choice(page[:value])
        end

        step.add_field(
          id: 'styling_preview',
          type: 'component'
        )

        step.on_update do |updater|
          updater.update_setting(:base_font, updater.fields[:body_font])
          updater.update_setting(:heading_font, updater.fields[:heading_font])

          if updater.fields[:homepage_style] == 'latest'
            top_menu = "latest|new|unread|top|categories"
          else
            top_menu = "categories|latest|new|unread|top"
            updater.update_setting(:desktop_category_page_style, updater.fields[:homepage_style])
          end
          updater.update_setting(:top_menu, top_menu)

          scheme_name = (
            (updater.fields[:color_scheme] || "") ||
            ColorScheme::LIGHT_THEME_ID
          )

          next unless scheme_name.present? && ColorScheme.is_base?(scheme_name)

          name = I18n.t("color_schemes.#{scheme_name.downcase.gsub(' ', '_')}_theme_name")

          scheme = ColorScheme.find_by(base_scheme_id: scheme_name, via_wizard: true)
          scheme ||= ColorScheme.create_from_base(name: name, via_wizard: true, base_scheme_id: scheme_name)

          if default_theme
            default_theme.color_scheme_id = scheme.id
            default_theme.save!
          else
            theme = Theme.create!(
              name: I18n.t("color_schemes.default_theme_name"),
              user_id: @wizard.user.id,
              color_scheme_id: scheme.id
            )

            theme.set_default!
          end

          if scheme.is_dark?
            updater.update_setting(:default_dark_mode_color_scheme_id, -1)
          end
        end
      end

      @wizard.append_step('branding') do |step|
        step.add_field(id: 'logo', type: 'image', value: SiteSetting.site_logo_url)
        step.add_field(id: 'logo_small', type: 'image', value: SiteSetting.site_logo_small_url)

        step.on_update do |updater|
          if SiteSetting.site_logo_url != updater.fields[:logo] ||
            SiteSetting.site_logo_small_url != updater.fields[:logo_small]
            updater.apply_settings(:logo, :logo_small)
            updater.refresh_required = true
          end
        end
      end

      @wizard.append_step('corporate') do |step|
        step.description_vars = { base_path: Discourse.base_path }
        step.add_field(id: 'company_name', type: 'text', value: SiteSetting.company_name)
        step.add_field(id: 'governing_law', type: 'text', value: SiteSetting.governing_law)
        step.add_field(id: 'contact_url', type: 'text', value: SiteSetting.contact_url)
        step.add_field(id: 'city_for_disputes', type: 'text', value: SiteSetting.city_for_disputes)

        username = SiteSetting.site_contact_username
        username = Discourse.system_user.username if username.blank?
        contact = step.add_field(id: 'site_contact', type: 'dropdown', value: username)

        User.human_users.where(admin: true).pluck(:username).each do |c|
          contact.add_choice(c) unless reserved_usernames.include?(c.downcase)
        end
        contact.add_choice(Discourse.system_user.username)

        step.on_update do |updater|
          update_tos do |raw|
            replace_setting_value(updater, raw, 'company_name')
            replace_setting_value(updater, raw, 'governing_law')
            replace_setting_value(updater, raw, 'city_for_disputes')
          end

          updater.apply_settings(:company_name, :governing_law, :city_for_disputes, :contact_url)
          updater.update_setting(:site_contact_username, updater.fields[:site_contact])
        end
      end

      DiscourseEvent.trigger(:build_wizard, @wizard)
      @wizard
    end

    protected

    def replace_setting_value(updater, raw, field_name)
      old_value = SiteSetting.get(field_name)
      old_value = field_name if old_value.blank?

      new_value = updater.fields[field_name.to_sym]
      new_value = field_name if new_value.blank?

      raw.gsub!("<ins>#{old_value}</ins>", new_value) || raw.gsub!(old_value, new_value)
    end

    def reserved_usernames
      @reserved_usernames ||= SiteSetting.defaults[:reserved_usernames].split('|')
    end

    def update_tos
      tos_post = Post.find_by(topic_id: SiteSetting.tos_topic_id, post_number: 1)

      if tos_post.present?
        raw = tos_post.raw.dup

        yield(raw)

        revisor = PostRevisor.new(tos_post)
        revisor.revise!(@wizard.user, raw: raw)
      end
    end
  end
end