/**
 * otel-todo.js - file todos / issues straight from the page.
 *
 * Shows a small floating symbol and listens for a keyboard shortcut. Opens a
 * native <dialog> in the bottom-right corner with a text box, an optional
 * component picker, and an "Reference an element" toggle that lets you click
 * any node on the page (with a hover outline) to attach its CSS selector and
 * a short label to the note. POSTs the note (with the current path, hash and
 * any picked element) to the collector's /v1/todos endpoint.
 *
 *   <script src="https://otel.example.com/static/otel-todo.js"
 *           data-service-name="checkout-web"
 *           data-ingest-key="..."
 *           data-components="Header,Cart,Payment"></script>
 *
 * Attributes (or OtelTodo.init({...}) keys): data-base-url, data-service-name
 * (the project), data-ingest-key, data-components (comma list, also
 * discovered from [data-component] elements on the page), data-shortcut
 * (default "alt+shift+t"), data-todo-endpoint, data-hide-button="true".
 */
(function (global) {
	'use strict';
	var DEFAULT_BASE_URL = 'https://otel.k6n.net';
	var scriptEl = document.currentScript;

	function attr(name) {
		return (scriptEl && scriptEl.getAttribute(name)) || '';
	}

	function parseShortcut(s) {
		var parts = String(s).toLowerCase().split('+');
		var sc = { key: parts.pop(), alt: false, shift: false, ctrl: false, meta: false };
		parts.forEach(function (p) {
			if (p === 'alt' || p === 'option') sc.alt = true;
			else if (p === 'shift') sc.shift = true;
			else if (p === 'ctrl' || p === 'control') sc.ctrl = true;
			else if (p === 'meta' || p === 'cmd') sc.meta = true;
		});
		return sc;
	}

	function init(config) {
		config = config || {};
		if (global.OtelTodo && global.OtelTodo.instance) return global.OtelTodo.instance;

		var baseUrl = (config.baseUrl || attr('data-base-url') || DEFAULT_BASE_URL).replace(/\/+$/, '');
		var endpoint = config.endpoint || attr('data-todo-endpoint') || baseUrl + '/v1/todos';
		var project = config.serviceName || attr('data-service-name') || attr('data-service') || 'frontend';
		var ingestKey = config.ingestKey || attr('data-ingest-key');
		var shortcut = parseShortcut(config.shortcut || attr('data-shortcut') || 'alt+shift+t');
		var hideButton = config.hideButton || attr('data-hide-button') === 'true';
		var staticComponents = config.components || attr('data-components').split(',');
		staticComponents = staticComponents.map(function (c) { return c.trim(); }).filter(Boolean);

		var sessionId = '';
		try { sessionId = global.sessionStorage.getItem('otel-rum-session') || ''; } catch (e) {}

		var css = document.createElement('style');
		css.textContent =
			'.otel-todo-btn{position:fixed;right:16px;bottom:16px;z-index:2147483646;width:32px;height:32px;border-radius:50%;' +
			'border:1px solid #8886;background:#fffd;color:#333;font:16px/1 system-ui,sans-serif;cursor:pointer;opacity:.55;padding:0}' +
			'.otel-todo-btn:hover,.otel-todo-btn:focus-visible{opacity:1}' +
			'dialog.otel-todo{position:fixed;inset:auto 16px 60px auto;margin:0;width:min(340px,calc(100vw - 32px));padding:12px;' +
			'border:1px solid #8886;border-radius:8px;background:Canvas;color:CanvasText;font:13px system-ui,sans-serif}' +
			'dialog.otel-todo *{box-sizing:border-box;font:inherit}' +
			'dialog.otel-todo textarea,dialog.otel-todo select{display:block;width:100%;margin:6px 0;padding:6px}' +
			'dialog.otel-todo textarea{min-height:90px;resize:vertical}' +
			'dialog.otel-todo .row{display:flex;gap:8px;justify-content:flex-end;align-items:center}' +
			'dialog.otel-todo .meta{opacity:.65;font-size:11px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}' +
			'dialog.otel-todo .status{margin-right:auto;font-size:12px}' +
			'.otel-todo-pick{display:inline-flex;align-items:center;gap:5px;border:1px solid #8886;border-radius:6px;' +
			'background:transparent;color:inherit;padding:5px 8px;margin:0 0 6px;cursor:pointer;font-size:12px}' +
			'.otel-todo-pick:hover,.otel-todo-pick:focus-visible{background:#8882}' +
			'.otel-todo-pick[aria-pressed="true"]{background:#3b82f633;border-color:#3b82f6aa;color:#3b82f6}' +
			'.otel-todo-ref{display:none;align-items:center;gap:6px;margin:0 0 6px;padding:5px 7px;border:1px solid #8886;' +
			'border-radius:6px;background:#8881;font:11px/1.3 ui-monospace,monospace}' +
			'.otel-todo-ref.show{display:flex}' +
			'.otel-todo-ref span{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}' +
			'.otel-todo-ref button{border:0;background:none;cursor:pointer;color:inherit;opacity:.6;font:12px/1 inherit;padding:0 2px}' +
			'.otel-todo-ref button:hover{opacity:1}' +
			'.otel-todo-hover-outline{position:fixed;z-index:2147483645;pointer-events:none;border:2px solid #3b82f6;' +
			'background:#3b82f626;border-radius:3px;transition:all .05s linear}' +
			'.otel-todo-pick-hint{position:fixed;left:50%;top:16px;transform:translateX(-50%);z-index:2147483647;' +
			'background:#3b82f6;color:#fff;font:12px/1 system-ui,sans-serif;padding:7px 12px;border-radius:20px;' +
			'box-shadow:0 4px 14px #0004}';
		document.head.appendChild(css);

		var dlg = document.createElement('dialog');
		dlg.className = 'otel-todo';
		dlg.setAttribute('aria-label', 'Add todo');
		dlg.innerHTML =
			'<form method="dialog">' +
			'<div class="meta"></div>' +
			'<button type="button" class="otel-todo-pick" aria-pressed="false">⌖ Reference an element</button>' +
			'<div class="otel-todo-ref"><span></span><button type="button" data-clear-ref aria-label="Remove reference">✕</button></div>' +
			'<textarea name="text" placeholder="What needs doing?" required maxlength="4000"></textarea>' +
			'<select name="component" aria-label="Component (optional)"></select>' +
			'<div class="row"><span class="status" role="status"></span>' +
			'<button type="button" data-cancel>Cancel</button><button type="submit">Add</button></div>' +
			'</form>';
		var form = dlg.firstChild;
		var textEl = form.elements.text;
		var selectEl = form.elements.component;
		var statusEl = form.querySelector('.status');
		var metaEl = form.querySelector('.meta');
		var pickBtn = form.querySelector('.otel-todo-pick');
		var refEl = form.querySelector('.otel-todo-ref');
		var refLabelEl = refEl.querySelector('span');
		document.body.appendChild(dlg);

		// --- element picker: click a node on the page to attach its selector ---
		var picked = null; // { selector, label }
		var hoverBox = null;
		var picking = false;
		var hint = null;

		function cssPath(el) {
			if (!(el instanceof Element)) return '';
			var parts = [];
			var node = el;
			while (node && node.nodeType === 1 && parts.length < 6) {
				if (node.id) { parts.unshift('#' + CSS.escape(node.id)); break; }
				var part = node.tagName.toLowerCase();
				var cls = (node.getAttribute('class') || '').trim().split(/\s+/).filter(Boolean).slice(0, 2);
				if (cls.length) part += '.' + cls.map(function (c) { return CSS.escape(c); }).join('.');
				var parent = node.parentElement;
				if (parent) {
					var siblings = [].filter.call(parent.children, function (c) { return c.tagName === node.tagName; });
					if (siblings.length > 1) part += ':nth-of-type(' + (siblings.indexOf(node) + 1) + ')';
				}
				parts.unshift(part);
				node = parent;
			}
			return parts.join(' > ');
		}

		function describeElement(el) {
			var tag = el.tagName.toLowerCase();
			var text = (el.getAttribute('aria-label') || el.textContent || '').replace(/\s+/g, ' ').trim();
			if (text.length > 60) text = text.slice(0, 60) + '…';
			return { selector: cssPath(el), label: text ? tag + ' – "' + text + '"' : tag };
		}

		function setRef(ref) {
			picked = ref;
			if (ref) {
				refLabelEl.textContent = ref.label;
				refLabelEl.title = ref.selector;
				refEl.classList.add('show');
			} else {
				refEl.classList.remove('show');
			}
		}

		function ensureHoverBox() {
			if (!hoverBox) {
				hoverBox = document.createElement('div');
				hoverBox.className = 'otel-todo-hover-outline';
				document.body.appendChild(hoverBox);
			}
			return hoverBox;
		}

		function onPickMove(e) {
			var el = document.elementFromPoint(e.clientX, e.clientY);
			if (!el || dlg.contains(el)) { ensureHoverBox().style.display = 'none'; return; }
			var r = el.getBoundingClientRect();
			var box = ensureHoverBox();
			box.style.display = 'block';
			box.style.left = r.left + 'px';
			box.style.top = r.top + 'px';
			box.style.width = r.width + 'px';
			box.style.height = r.height + 'px';
		}

		function onPickClick(e) {
			var el = document.elementFromPoint(e.clientX, e.clientY);
			if (!el || dlg.contains(el)) return; // let dialog controls work normally
			e.preventDefault();
			e.stopPropagation();
			setRef(describeElement(el));
			stopPicking();
		}

		function onPickKey(e) {
			if (e.key === 'Escape') { e.preventDefault(); e.stopPropagation(); stopPicking(); }
		}

		function startPicking() {
			if (picking) return;
			picking = true;
			pickBtn.setAttribute('aria-pressed', 'true');
			pickBtn.textContent = '⌖ Click an element… (Esc to cancel)';
			hint = document.createElement('div');
			hint.className = 'otel-todo-pick-hint';
			hint.textContent = 'Click the element you mean — Esc to cancel';
			document.body.appendChild(hint);
			document.addEventListener('mousemove', onPickMove, true);
			document.addEventListener('click', onPickClick, true);
			document.addEventListener('keydown', onPickKey, true);
		}

		function stopPicking() {
			if (!picking) return;
			picking = false;
			pickBtn.setAttribute('aria-pressed', 'false');
			pickBtn.textContent = '⌖ Reference an element';
			document.removeEventListener('mousemove', onPickMove, true);
			document.removeEventListener('click', onPickClick, true);
			document.removeEventListener('keydown', onPickKey, true);
			if (hoverBox) { hoverBox.style.display = 'none'; }
			if (hint) { hint.remove(); hint = null; }
		}

		pickBtn.addEventListener('click', function () { picking ? stopPicking() : startPicking(); });
		refEl.querySelector('[data-clear-ref]').addEventListener('click', function () { setRef(null); });

		function components() {
			var seen = {};
			var list = [];
			staticComponents.concat([].map.call(document.querySelectorAll('[data-component]'), function (el) {
				return el.getAttribute('data-component');
			})).forEach(function (c) {
				if (c && !seen[c]) { seen[c] = true; list.push(c); }
			});
			return list;
		}

		function open() {
			if (dlg.open) { textEl.focus(); return; }
			selectEl.innerHTML = '';
			var none = document.createElement('option');
			none.value = '';
			none.textContent = 'No component';
			selectEl.appendChild(none);
			var list = components();
			list.forEach(function (c) {
				var o = document.createElement('option');
				o.value = o.textContent = c;
				selectEl.appendChild(o);
			});
			selectEl.hidden = list.length === 0;
			metaEl.textContent = project + ' · ' + location.pathname + location.hash;
			statusEl.textContent = '';
			setRef(null);
			// Non-modal so the page stays usable while the note is being written.
			dlg.show();
			textEl.focus();
		}

		function close() {
			stopPicking();
			if (dlg.open) dlg.close();
		}

		form.querySelector('[data-cancel]').addEventListener('click', close);
		dlg.addEventListener('keydown', function (e) {
			if (e.key === 'Escape') { e.preventDefault(); close(); }
			else if (e.key === 'Enter' && (e.ctrlKey || e.metaKey)) { e.preventDefault(); form.requestSubmit(); }
		});
		form.addEventListener('submit', function (e) {
			e.preventDefault();
			var text = textEl.value.trim();
			if (!text) return;
			var headers = { 'Content-Type': 'application/json' };
			var url = endpoint;
			if (ingestKey) headers['X-Otel-Ingest-Key'] = ingestKey;
			statusEl.textContent = 'Sending…';
			global.fetch(url, {
				method: 'POST',
				mode: 'cors',
				headers: headers,
				body: JSON.stringify({
					project: project,
					text: text,
					component: selectEl.value,
					path: location.pathname,
					hash: location.hash,
					url: location.href,
					ua: navigator.userAgent,
					session: sessionId,
					elementSelector: picked ? picked.selector : '',
					elementLabel: picked ? picked.label : ''
				})
			}).then(function (res) {
				if (!res.ok) throw new Error('HTTP ' + res.status);
				textEl.value = '';
				setRef(null);
				close();
			}).catch(function (err) {
				statusEl.textContent = 'Failed: ' + err.message;
			});
		});

		global.addEventListener('keydown', function (e) {
			var k = e.key.toLowerCase();
			var code = (e.code || '').replace(/^(Key|Digit)/, '').toLowerCase();
			if ((k === shortcut.key || code === shortcut.key) && e.altKey === shortcut.alt && e.shiftKey === shortcut.shift &&
				e.ctrlKey === shortcut.ctrl && e.metaKey === shortcut.meta) {
				e.preventDefault();
				dlg.open ? close() : open();
			}
		});

		if (!hideButton) {
			var btn = document.createElement('button');
			btn.type = 'button';
			btn.className = 'otel-todo-btn';
			btn.textContent = '✎';
			btn.title = 'Add todo (' + (config.shortcut || attr('data-shortcut') || 'alt+shift+t') + ')';
			btn.setAttribute('aria-label', 'Add todo');
			btn.addEventListener('click', function () { dlg.open ? close() : open(); });
			document.body.appendChild(btn);
		}

		var instance = { open: open, close: close };
		global.OtelTodo.instance = instance;
		return instance;
	}

	global.OtelTodo = { init: init, instance: undefined };

	if (scriptEl && (attr('data-auto-init') === 'true' || attr('data-service-name') || attr('data-service'))) {
		if (document.readyState === 'loading') document.addEventListener('DOMContentLoaded', function () { init(); });
		else init();
	}
})(window);