{% load static %}
{% load lyric_extras %}
{# ─────────────────────────────────────────────────────────────────────── #}
{# _bud_panel.html — bottom-left handshake btn + slide-out recipient    #}
{# field for the share-post async flow. Mirror of #id_kit_btn (bottom-     #}
{# right). Included by post.html only.                                     #}
{#                                                                         #}
{# Spec lives in functional_tests/test_bud_btn.py — write it red-first. #}
{# Run:                                                                    #}
{#     python src/manage.py test functional_tests.test_bud_btn           #}
{# ─────────────────────────────────────────────────────────────────────── #}

<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-share-url="{% url 'billboard:share_post' post.id %}"
     data-sharer-name="{% if request.user.is_authenticated %}{{ request.user|display_name }}{% 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>
    bindBudAutocomplete(
        document.getElementById('id_recipient'),
        document.getElementById('id_bud_suggestions'),
        { searchUrl: '{% url "billboard:search_buds" %}' }
    );
</script>

<script>
(function () {
    'use strict';

    var btn   = document.getElementById('id_bud_btn');
    var panel = document.getElementById('id_bud_panel');
    var input = document.getElementById('id_recipient');
    var ok    = document.getElementById('id_bud_ok');
    var html  = document.documentElement;
    if (!btn || !panel || !input || !ok) return;

    function _csrf() {
        var m = document.cookie.match(/csrftoken=([^;]+)/);
        return m ? m[1] : '';
    }

    function _open() {
        html.classList.add('bud-open');
        btn.classList.add('active');
        // small delay before focus so the slide-out animation can play
        setTimeout(function () { input.focus(); }, 60);
    }

    function _close(opts) {
        opts = opts || {};
        html.classList.remove('bud-open');
        btn.classList.remove('active');
        if (opts.clear !== false) input.value = '';
    }

    btn.addEventListener('click', function () {
        if (html.classList.contains('bud-open')) {
            _close();
        } else {
            _open();
        }
    });

    // Escape closes the panel, clears the field
    document.addEventListener('keydown', function (e) {
        if (e.key === 'Escape' && html.classList.contains('bud-open')) _close();
    });

    // Click-outside dismiss — same pattern as game-kit.js
    document.addEventListener('click', function (e) {
        if (!html.classList.contains('bud-open')) return;
        if (panel.contains(e.target)) return;
        if (e.target === btn || btn.contains(e.target)) return;
        // Autocomplete suggestions sit outside the panel (panel overflow
        // is hidden for the scaleX slide). A click inside them must NOT
        // close+clear the panel.
        var sg = document.getElementById('id_bud_suggestions');
        if (sg && sg.contains(e.target)) return;
        _close();
    });

    // OK → POST share-post async; reuses the C3.b response handling so the
    // recipient chip + brief banner + post-line append all light up.
    // Post-May08b layout: #id_post_table is a <ul> of <li class="post-line">
    // rows. Author = the sharer (rendered server-side as data-sharer-name on
    // the panel) 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);
        // Insert before the trailing buffer if present
        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 — it's two <p>
    // siblings under .post-header. State transitions:
    //   0 → 1+ recipients : "just me, X" turns into
    //                        "shared between {chip}" + "& me, X"
    //   ≥1 → +1 recipients: append chip + ", " separator before existing
    //                        recipient(s).
    function _appendRecipientChip(displayName) {
        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 (existingRecipients) {
            existingRecipients.appendChild(document.createTextNode(', '));
            existingRecipients.appendChild(chip);
            return;
        }

        // 0 → 1+ transition: build the recipients line, rewrite the self
        // line from "just me, …" to "& me, …".
        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);
            // Replace "just me," prefix with "& me,"
            selfLine.textContent = selfLine.textContent.replace(/^just me,/, '& me,');
        } else {
            header.appendChild(recipientsLine);
        }
    }

    ok.addEventListener('click', function () {
        var email = input.value.trim();
        if (!email) return;

        var fd = new FormData();
        fd.set('recipient', email);

        fetch(panel.dataset.shareUrl, {
            method: 'POST',
            credentials: 'same-origin',
            headers: {
                'Accept':       'application/json',
                'X-CSRFToken':  _csrf(),
            },
            body: fd,
        })
            .then(function (r) { return r.ok ? r.json() : Promise.reject(r.status); })
            .then(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);
                _close({ clear: true });
            })
            .catch(function () {
                // swallow — privacy-safe response shape means even an
                // unregistered recipient is a 200; only network/5xx land here.
            });
    });

    // Submit-on-Enter inside the input mirrors clicking OK
    input.addEventListener('keydown', function (e) {
        if (e.key === 'Enter') {
            e.preventDefault();
            ok.click();
        }
    });
}());
</script>