{% load static %}
{% load lyric_extras %}
{# ─────────────────────────────────────────────────────────────────────── #}
{# _bud_panel.html — bottom-left handshake btn + slide-out recipient    #}
{# field for the share-post async flow. Skeleton (open/close/POST + auto- #}
{# complete) owned by bud-btn.js; this partial wires the share-post       #}
{# success callback: appends a Line to #id_post_table, fires Brief.show-   #}
{# Banner, and updates the .post-header shared-with prose.                  #}
{# Included by post.html only.                                              #}
{#                                                                         #}
{# Spec lives in functional_tests/test_bud_btn.py.                        #}
{# ─────────────────────────────────────────────────────────────────────── #}

<button id="id_bud_btn" type="button" aria-label="Share with a bud">
    <i class="fa-solid fa-handshake"></i>
</button>

<div id="id_bud_panel"
     data-sharer-name="{% if request.user.is_authenticated %}{{ request.user|at_handle }}{% endif %}">
    <input id="id_recipient"
           name="recipient"
           type="text"
           placeholder="friend@example.com or username"
           autocomplete="off">
    <button id="id_bud_ok" type="button" class="btn btn-confirm">OK</button>
</div>

{# Autocomplete suggestions — sibling of #id_bud_panel because the panel #}
{# has overflow:hidden for its scaleX slide animation.                   #}
<div id="id_bud_suggestions" class="bud-suggestions" hidden></div>

<script src="{% static 'apps/billboard/bud-autocomplete.js' %}"></script>
<script src="{% static 'apps/billboard/bud-btn.js' %}"></script>
<script>
(function () {
    'use strict';

    var panel = document.getElementById('id_bud_panel');

    // Author = the sharer (rendered server-side as data-sharer-name) so the
    // appended Line matches the post-refresh state, where the persisted
    // Line.author is request.user.
    function _appendLine(text) {
        var list = document.getElementById('id_post_table');
        if (!list) return;
        var li = document.createElement('li');
        li.className = 'post-line';
        var author = document.createElement('span');
        author.className = 'post-line-author';
        author.textContent = panel.dataset.sharerName || '';
        var body = document.createElement('span');
        body.className = 'post-line-text';
        body.textContent = text;
        var time = document.createElement('time');
        time.className = 'post-line-time';
        var now = new Date();
        time.dateTime = now.toISOString();
        time.textContent = now.toLocaleTimeString([], {hour: 'numeric', minute: '2-digit'});
        li.appendChild(author);
        li.appendChild(body);
        li.appendChild(time);
        var buffer = list.querySelector('.post-line-buffer');
        if (buffer) list.insertBefore(li, buffer);
        else list.appendChild(li);
    }

    // The shared-with header lives outside #id_bud_panel — two <p> siblings
    // under .post-header. State transitions:
    //   0 → 1+ recipients : "just me, X" → "shared between {chip}" + "& me, X"
    //   ≥1 → +1 recipients: append chip + ", " separator before existing.
    // `userId` is stamped onto the chip as data-user-id so a later duplicate-
    // share attempt can highlight this same element via .bud-duplicate-flash.
    function _appendRecipientChip(displayName, userId) {
        if (!displayName) return;
        var header = document.querySelector('.post-page .post-header');
        if (!header) return;
        var existingRecipients = header.querySelector('.post-shared-recipients');
        var selfLine = header.querySelector('.post-shared-self');

        var chip = document.createElement('span');
        chip.className = 'post-recipient';
        chip.textContent = displayName;
        if (userId) chip.dataset.userId = userId;

        if (existingRecipients) {
            existingRecipients.appendChild(document.createTextNode(', '));
            existingRecipients.appendChild(chip);
            return;
        }

        var recipientsLine = document.createElement('p');
        recipientsLine.className = 'post-shared-recipients';
        recipientsLine.appendChild(document.createTextNode('shared between '));
        recipientsLine.appendChild(chip);
        if (selfLine) {
            header.insertBefore(recipientsLine, selfLine);
            selfLine.textContent = selfLine.textContent.replace(/^just me,/, '& me,');
        } else {
            header.appendChild(recipientsLine);
        }
    }

    bindBudBtn({
        submitUrl: '{% url "billboard:share_post" post.id %}',
        autocompleteUrl: '{% url "billboard:search_buds" %}',
        onSuccess: function (data) {
            if (data.line_text) _appendLine(data.line_text);
            if (window.Brief && data.brief) Brief.showBanner(data.brief);
            if (data.recipient_display) {
                _appendRecipientChip(data.recipient_display, data.recipient_user_id);
            }
        },
        duplicateTargetSelector: function (data) {
            return '.post-recipient[data-user-id="' + data.recipient_user_id + '"]';
        },
    });
}());
</script>