{% extends "base.html" %}
{% load i18n %}
{% load static %}

{% block head %}
<style>
    .thread-container {
        display: flex;
        flex-direction: column;
        gap: 1rem;
    }
    .msg-bubble {
        max-width: 80%;
        display: inline-block;
        word-break: break-word;
    }
    .msg-mine .msg-bubble {
        background: var(--brand-color, #2f3e8b);
        color: #fff;
        border-radius: 16px 16px 4px 16px;
    }
    .msg-other .msg-bubble {
        background: #f1f3f5;
        color: #212529;
        border-radius: 16px 16px 16px 4px;
    }
    .msg-mine { align-items: flex-end; }
    .msg-other { align-items: flex-start; }
    .avatar-xs {
        width: 32px;
        height: 32px;
        font-size: 0.75rem;
        border-radius: 50%;
        display: flex;
        align-items: center;
        justify-content: center;
        flex-shrink: 0;
        background: #6c757d;
        color: #fff;
    }
    #thread-scroll {
        max-height: 60vh;
        overflow-y: auto;
    }
    .attachment-thumb {
        width: 60px;
        height: 60px;
        object-fit: cover;
        border-radius: 6px;
    }
</style>
{% endblock %}

{% block content %}
<div class="container py-4" style="max-width:860px;">

    <!-- Breadcrumb / Header -->
    <div class="d-flex align-items-center gap-2 mb-3">
        <a href="{% url 'notifications:discussion_list' %}" class="btn btn-sm btn-outline-secondary">
            <i class="bi bi-arrow-left"></i>
        </a>
        <div class="flex-grow-1">
            <h1 class="h4 mb-0">{{ discussion.title|default:discussion }}</h1>
            {% if discussion.object_label %}
            <a href="{{ discussion.object_url }}" class="small text-muted">
                <i class="bi bi-link-45deg me-1"></i>{{ discussion.object_label }}
            </a>
            {% endif %}
        </div>
        {% if discussion.is_closed %}
        <span class="badge bg-secondary"><i class="bi bi-lock me-1"></i>{% translate "Clôturée" %}</span>
        {% endif %}
    </div>

    <!-- Participants -->
    <div class="mb-3 d-flex flex-wrap gap-1">
        {% for p in discussion.participants.all %}
        <span class="badge bg-light text-dark border">
            <i class="bi bi-person me-1"></i>{{ p.get_full_name|default:p.username }}
        </span>
        {% endfor %}
    </div>

    <!-- Messages -->
    <div class="card shadow-sm mb-3">
        <div class="card-body p-3" id="thread-scroll">
            {% if not thread_messages %}
            <p class="text-muted text-center py-4 mb-0">
                <i class="bi bi-chat-square d-block fs-2 mb-2"></i>
                {% translate "Aucun message pour l'instant. Soyez le premier à écrire." %}
            </p>
            {% else %}
            <div class="thread-container">
                {% for msg in thread_messages %}
                <div class="d-flex flex-column {% if msg.author == request.user %}msg-mine{% else %}msg-other{% endif %}">
                    {% if msg.author != request.user %}
                    <div class="d-flex align-items-end gap-2">
                        <div class="avatar-xs">
                            {{ msg.author.get_short_name|first|upper|default:msg.author.username|first|upper }}
                        </div>
                    {% endif %}
                        <div>
                            {% if msg.author != request.user %}
                            <div class="small text-muted mb-1">
                                <strong>{{ msg.author.get_full_name|default:msg.author.username }}</strong>
                                · {{ msg.created_at|date:"d/m/Y H:i" }}
                            </div>
                            {% else %}
                            <div class="small text-muted mb-1 text-end">
                                {{ msg.created_at|date:"d/m/Y H:i" }}
                            </div>
                            {% endif %}
                            <div class="msg-bubble p-3">
                                {{ msg.content|linebreaksbr }}
                                {% if msg.attachments.exists %}
                                <div class="mt-2 d-flex flex-wrap gap-2">
                                    {% for att in msg.attachments.all %}
                                    {% if att.is_image %}
                                    <a href="{{ att.file.url }}" target="_blank">
                                        <img src="{{ att.file.url }}" class="attachment-thumb" alt="{{ att.name }}">
                                    </a>
                                    {% else %}
                                    <a href="{{ att.file.url }}" target="_blank"
                                       class="btn btn-sm {% if msg.author == request.user %}btn-outline-light{% else %}btn-outline-secondary{% endif %}">
                                        <i class="bi bi-paperclip me-1"></i>{{ att.name|truncatechars:24 }}
                                    </a>
                                    {% endif %}
                                    {% endfor %}
                                </div>
                                {% endif %}
                            </div>
                        </div>
                    {% if msg.author != request.user %}
                    </div>
                    {% endif %}
                </div>
                {% endfor %}
            </div>
            {% endif %}
        </div>
    </div>

    <!-- Reply form -->
    {% if not discussion.is_closed %}
    <form method="post" enctype="multipart/form-data" action="">
        {% csrf_token %}
        <div class="card shadow-sm">
            <div class="card-body p-3">
                <textarea name="content" class="form-control mb-2" rows="3"
                          placeholder="{% translate 'Répondre...' %}" required id="reply-textarea"></textarea>
                <div class="d-flex justify-content-between align-items-center">
                    <label class="btn btn-outline-secondary btn-sm mb-0" id="attach-label">
                        <i class="bi bi-paperclip me-1"></i>{% translate "Joindre" %}
                        <input type="file" name="attachments" multiple class="d-none" id="attach-input"
                               onchange="document.getElementById('attach-count').textContent = this.files.length ? '(' + this.files.length + ')' : ''">
                    </label>
                    <span id="attach-count" class="small text-muted"></span>
                    <button type="submit" class="btn btn-primary">
                        <i class="bi bi-send me-1"></i>{% translate "Envoyer" %}
                    </button>
                </div>
            </div>
        </div>
    </form>
    {% else %}
    <div class="alert alert-secondary"><i class="bi bi-lock me-2"></i>{% translate "Cette discussion est clôturée." %}</div>
    {% endif %}

</div>
{% endblock content %}

{% block script %}
<script>
// Scroll to bottom of thread on load
const threadScroll = document.getElementById('thread-scroll');
if (threadScroll) {
    threadScroll.scrollTop = threadScroll.scrollHeight;
}
</script>
{% endblock %}