{% comment %}
  Shared plan-pricing resolution — the SSOT for the pricing math every theme's
  pricing layout uses. Jekyll includes share the caller's variable scope, so
  the assigns below land in the calling template.

  In:  include.plan — a page.resolved.pricing.plans item

  Out: _config_product        — matching site.web_manager.payment.products entry (or nil)
       _plan_monthly          — monthly price (frontmatter pricing → config prices → 0)
       _plan_annually         — annual price (frontmatter pricing → config prices → 0)
       _ppu_value             — per-unit feature value (nil unless price_per_unit enabled and plan is paid)
       monthly_price_per_unit — $/unit at monthly billing (nil unless _ppu_value > 0)
       annual_price_per_unit  — $/unit at annual billing, monthly-equivalent (nil unless _ppu_value > 0)

  Every output is (re)assigned on every call so loop iterations never see a
  previous plan's values.
{% endcomment %}

{% assign _config_product = nil %}
{% for p in site.web_manager.payment.products %}
  {% if p.id == include.plan.id %}{% assign _config_product = p %}{% break %}{% endif %}
{% endfor %}

{% comment %} Prices: frontmatter pricing takes precedence, then config, then 0 {% endcomment %}
{% if include.plan.pricing.monthly or include.plan.pricing.monthly == 0 %}
  {% assign _plan_monthly = include.plan.pricing.monthly %}
{% elsif _config_product.prices.monthly or _config_product.prices.monthly == 0 %}
  {% assign _plan_monthly = _config_product.prices.monthly %}
{% else %}
  {% assign _plan_monthly = 0 %}
{% endif %}

{% if include.plan.pricing.annually or include.plan.pricing.annually == 0 %}
  {% assign _plan_annually = include.plan.pricing.annually %}
{% elsif _config_product.prices.annually or _config_product.prices.annually == 0 %}
  {% assign _plan_annually = _config_product.prices.annually %}
{% else %}
  {% assign _plan_annually = 0 %}
{% endif %}

{% comment %} Per-unit value: frontmatter feature value, falling back to config product limits. Per-unit prices only compute when the value is a usable positive number (guards the divided_by) {% endcomment %}
{% assign _ppu_value = nil %}
{% assign monthly_price_per_unit = nil %}
{% assign annual_price_per_unit = nil %}
{% if page.resolved.pricing.price_per_unit.enabled and _plan_monthly > 0 %}
  {% for feature in include.plan.features %}
    {% if feature.id == page.resolved.pricing.price_per_unit.feature_id %}
      {% assign _ppu_value = feature.value %}
      {% if _config_product and _ppu_value == nil %}
        {% for _lim in _config_product.limits %}{% if _lim[0] == feature.id %}{% assign _ppu_value = _lim[1] %}{% break %}{% endif %}{% endfor %}
      {% endif %}
    {% endif %}
  {% endfor %}
  {% if _ppu_value and _ppu_value > 0 %}
    {% assign monthly_price_per_unit = _plan_monthly | times: 1.0 | divided_by: _ppu_value | round: 2 %}
    {% assign annual_monthly_price = _plan_annually | divided_by: 12.0 %}
    {% assign annual_price_per_unit = annual_monthly_price | divided_by: _ppu_value | round: 2 %}
  {% endif %}
{% endif %}