// ── Plugin Settings UI ──
// Toggles collect pending changes client-side and commit together via
// the Apply button. Only reloads once all changes are committed.

import { $, esc, api } from './util.js';

let pluginsCache = null;
let pending = new Map(); // name -> desired enabled state

async function fetchPlugins() {
    const res = await fetch('api/plugins');
    if (!res.ok) throw new Error('failed to load plugins');
    pluginsCache = await res.json();
    return pluginsCache;
}

function render(list) {
    const container = $('plugins-list');
    if (!container) return;
    if (!list.length) {
        container.innerHTML = '<p class="text-xs text-t-dim italic">No plugins installed. Drop a plugin folder into <code>public/plugins/</code> to add one.</p>';
        return;
    }
    container.innerHTML = list.map(p => {
        const effectiveEnabled = pending.has(p.name) ? pending.get(p.name) : p.enabled;
        const isPending = pending.has(p.name);
        return `
        <div class="flex items-start gap-3 px-3 py-2 border ${isPending ? 'border-t-accent' : 'border-t-border'} bg-t-bg rounded-sm" data-plugin="${esc(p.name)}">
            <div class="flex-1 min-w-0">
                <div class="flex items-center gap-2">
                    <span class="font-pixel text-[11px] text-t-bright">${esc(p.name)}</span>
                    <span class="font-pixel text-[9px] text-t-dim">v${esc(p.version || '?')}</span>
                    ${p.hasBackend ? '<span class="font-pixel text-[8px] px-1 py-0.5 border border-t-border text-t-muted uppercase">php</span>' : ''}
                    ${isPending ? `<span class="font-pixel text-[8px] px-1 py-0.5 text-t-accent border border-t-accent uppercase">${effectiveEnabled ? 'will enable' : 'will disable'}</span>` : ''}
                </div>
                ${p.description ? `<div class="text-[10px] text-t-muted leading-snug mt-1">${esc(p.description)}</div>` : ''}
            </div>
            <label class="flex items-center cursor-pointer shrink-0 mt-0.5">
                <input type="checkbox" class="plugin-toggle accent-t-accent w-4 h-4" ${effectiveEnabled ? 'checked' : ''} data-name="${esc(p.name)}" data-original="${p.enabled ? '1' : '0'}">
            </label>
        </div>`;
    }).join('');

    container.querySelectorAll('.plugin-toggle').forEach(input => {
        input.addEventListener('change', onToggle);
    });

    updateApplyBar();
}

function onToggle(e) {
    const input = e.currentTarget;
    const name = input.dataset.name;
    const original = input.dataset.original === '1';
    const desired = input.checked;
    if (desired === original) {
        pending.delete(name);
    } else {
        pending.set(name, desired);
    }
    render(pluginsCache); // re-render to update badge and border
}

function updateApplyBar() {
    const bar = $('plugins-apply-bar');
    if (!bar) return;
    if (pending.size === 0) {
        bar.classList.add('hidden');
        return;
    }
    bar.classList.remove('hidden');
    const count = pending.size;
    const label = $('plugins-apply-count');
    if (label) label.textContent = `${count} pending change${count !== 1 ? 's' : ''}`;
}

async function applyChanges() {
    if (pending.size === 0) return;
    const btn = $('plugins-apply-btn');
    if (btn) { btn.disabled = true; btn.textContent = 'applying...'; }
    try {
        for (const [name, enabled] of pending) {
            const res = await api('api/plugins/toggle', { method: 'POST', body: { name, enabled } });
            if (res.error) throw new Error(`${name}: ${res.error}`);
        }
        pending.clear();
        // Reload so the new plugin set takes effect
        location.reload();
    } catch (err) {
        if (btn) { btn.disabled = false; btn.textContent = 'Apply'; }
        alert('Failed to apply: ' + err.message);
    }
}

function discardChanges() {
    pending.clear();
    render(pluginsCache);
}

export async function openPluginSettings() {
    const container = $('plugins-list');
    if (!container) return;
    container.innerHTML = '<p class="text-xs text-t-dim italic">Loading...</p>';
    try {
        const list = await fetchPlugins();
        render(list);
    } catch (err) {
        container.innerHTML = `<p class="text-xs text-t-danger">Failed to load plugins: ${esc(err.message)}</p>`;
    }
}

$('plugins-apply-btn')?.addEventListener('click', applyChanges);
$('plugins-discard-btn')?.addEventListener('click', discardChanges);