{% load static %}
{# ─────────────────────────────────────────────────────────────────────── #}
{# _buddy_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_buddy_btn.py — write it red-first. #}
{# Run:                                                                    #}
{#     python src/manage.py test functional_tests.test_buddy_btn           #}
{# ─────────────────────────────────────────────────────────────────────── #}

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

<div id="id_buddy_panel" data-share-url="{% url 'billboard:share_post' post.id %}">
    <input id="id_recipient"
           name="recipient"
           type="email"
           placeholder="friend@example.com"
           autocomplete="off">
    <button id="id_buddy_ok" type="button" class="btn btn-confirm">OK</button>
</div>

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

    var btn   = document.getElementById('id_buddy_btn');
    var panel = document.getElementById('id_buddy_panel');
    var input = document.getElementById('id_recipient');
    var ok    = document.getElementById('id_buddy_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('buddy-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('buddy-open');
        btn.classList.remove('active');
        if (opts.clear !== false) input.value = '';
    }

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

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

    // Click-outside dismiss — same pattern as game-kit.js
    document.addEventListener('click', function (e) {
        if (!html.classList.contains('buddy-open')) return;
        if (panel.contains(e.target)) return;
        if (e.target === btn || btn.contains(e.target)) return;
        _close();
    });

    // OK → POST share-post async; reuses the C3.b response handling so the
    // recipient chip + brief banner + post-table line append all light up.
    function _appendLine(text) {
        var table = document.getElementById('id_post_table');
        if (!table) return;
        var n = table.querySelectorAll('tr').length + 1;
        var tr = document.createElement('tr');
        var td = document.createElement('td');
        td.textContent = n + '. ' + text;
        tr.appendChild(td);
        table.appendChild(tr);
    }

    function _appendRecipientChip(displayName) {
        var box = document.getElementById('id_post_recipients');
        if (!box || !displayName) return;
        var span = document.createElement('span');
        span.className = 'post-recipient';
        span.textContent = displayName;
        box.appendChild(document.createTextNode(' '));
        box.appendChild(span);
    }

    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>