{# Macro pour afficher un indicateur de tendance sous un KPI.
   Usage : {% include 'admin/stats/_trend.html.twig' with {trend: behavior.avg_duration_trend, invert: false} %}
   - trend : {delta: float|null, direction: 'up'|'down'|'stable'}
   - invert : true si "up" est negatif (ex: taux de rebond)
#}
{% if trend is defined and trend is not null %}
    {% set dir = trend.direction %}
    {% set delta = trend.delta %}

    {# Inverser le sens pour le rebond : up = mauvais, down = bon #}
    {% set good = (dir == 'up' and not invert) or (dir == 'down' and invert) %}
    {% set bad = (dir == 'down' and not invert) or (dir == 'up' and invert) %}

    <div class="bw-kpi__trend {{ good ? 'bw-kpi__trend--up' : (bad ? 'bw-kpi__trend--down' : 'bw-kpi__trend--stable') }}">
        {% if dir == 'up' %}
            <i class="fas fa-arrow-up fa-xs"></i>
        {% elseif dir == 'down' %}
            <i class="fas fa-arrow-down fa-xs"></i>
        {% else %}
            <i class="fas fa-equals fa-xs"></i>
        {% endif %}
        {% if delta is not null %}
            {{ delta > 0 ? '+' : '' }}{{ delta }}%
        {% elseif dir == 'up' %}
            Nouveau
        {% endif %}
    </div>
{% endif %}