/* BreznFlow — Admin JS (vanilla ES2020, no dependencies) */
/* global breznflowAdmin */

(function () {
	'use strict';

	// ── AJAX helpers ──────────────────────────────────────────────────────────

	function post(action, data, callback) {
		const params = new URLSearchParams();
		params.append('action', action);
		params.append('nonce', breznflowAdmin.nonce);
		for (const [k, v] of Object.entries(data)) {
			params.append(k, v);
		}

		fetch(breznflowAdmin.ajaxUrl, {
			method: 'POST',
			headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
			body: params.toString(),
		})
			.then(function(r) { return r.json(); })
			.then(callback)
			.catch(function(err) {
				callback({ success: false, data: { message: String(err) } });
			});
	}

	// ── Step 1: Validation ────────────────────────────────────────────────────

	const jsonTextarea = document.getElementById('breznflow-json');
	const validateBtn  = document.getElementById('breznflow-validate-btn');
	const submitBtn    = document.getElementById('breznflow-step1-submit');
	const resultDiv    = document.getElementById('breznflow-validation-result');

	function showResult(success, message) {
		if (!resultDiv) return;
		resultDiv.removeAttribute('hidden');
		resultDiv.className = success ? 'success' : 'error';
		resultDiv.textContent = message;
	}

	if (validateBtn && jsonTextarea) {
		validateBtn.addEventListener('click', function () {
			const json = jsonTextarea.value.trim();
			if (!json) {
				showResult(false, breznflowAdmin.i18n.pasteFirst || 'Please paste a workflow JSON first.');
				return;
			}
			validateBtn.disabled = true;
			validateBtn.textContent = breznflowAdmin.i18n.validating || 'Validating...';

			post('breznflow_validate_json', { json: json }, function(resp) {
				validateBtn.disabled = false;
				validateBtn.textContent = breznflowAdmin.i18n.validateJson || 'Validate JSON';

				if (resp.success) {
					const msg = (breznflowAdmin.i18n.valid || 'Valid n8n workflow') +
						': ' + resp.data.name + ' \u2014 ' + resp.data.nodes + ' ' + (breznflowAdmin.i18n.nodes || 'nodes');
					showResult(true, msg);
					if (submitBtn) submitBtn.disabled = false;
				} else {
					showResult(false, (breznflowAdmin.i18n.invalid || 'Invalid') + ': ' + (resp.data && resp.data.message ? resp.data.message : 'Unknown error'));
					if (submitBtn) submitBtn.disabled = true;
				}
			});
		});
	}

	// ── Step 1: File upload → textarea ────────────────────────────────────────

	const fileInput = document.getElementById('breznflow-file');
	if (fileInput && jsonTextarea) {
		fileInput.addEventListener('change', function () {
			const file = this.files && this.files[0];
			if (!file) return;
			const reader = new FileReader();
			reader.onload = function(e) {
				jsonTextarea.value = e.target.result;
				if (resultDiv) {
					resultDiv.setAttribute('hidden', '');
					resultDiv.className = '';
					resultDiv.textContent = '';
				}
				if (submitBtn) submitBtn.disabled = true;
			};
			reader.readAsText(file);
		});
	}

	// ── Step 1: URL fetch ─────────────────────────────────────────────────────

	const urlInput  = document.getElementById('breznflow-url');
	const fetchBtn  = document.getElementById('breznflow-fetch-url');
	if (fetchBtn && urlInput && jsonTextarea) {
		fetchBtn.addEventListener('click', function () {
			const url = urlInput.value.trim();
			if (!url) return;
			fetchBtn.disabled = true;
			fetchBtn.textContent = breznflowAdmin.i18n.fetching || 'Fetching...';

			post('breznflow_fetch_url', { url: url }, function(resp) {
				fetchBtn.disabled = false;
				fetchBtn.textContent = breznflowAdmin.i18n.fetch || 'Fetch';
				if (resp.success && resp.data && resp.data.json) {
					jsonTextarea.value = resp.data.json;
					if (submitBtn) submitBtn.disabled = true;
					if (resultDiv) {
						resultDiv.setAttribute('hidden', '');
						resultDiv.textContent = '';
					}
				} else {
					showResult(false, resp.data && resp.data.message ? resp.data.message : (breznflowAdmin.i18n.fetchFailed || 'Fetch failed'));
				}
			});
		});
	}

	// ── Copy Shortcode buttons ────────────────────────────────────────────────

	function attachCopyButtons() {
		document.querySelectorAll('.breznflow-copy-sc').forEach(function(btn) {
			btn.addEventListener('click', function () {
				const sc = btn.getAttribute('data-sc') || '';
				const label = btn.textContent;
				if (!sc) return;

				if (navigator.clipboard && navigator.clipboard.writeText) {
					navigator.clipboard.writeText(sc).then(function() {
						btn.textContent = breznflowAdmin.i18n.copied || 'Copied!';
						setTimeout(function() { btn.textContent = label; }, 2000);
					}).catch(function() {
						fallbackCopy(sc, btn, label);
					});
				} else {
					fallbackCopy(sc, btn, label);
				}
			});
		});
	}

	function fallbackCopy(text, btn, label) {
		const ta = document.createElement('textarea');
		ta.value = text;
		ta.style.position = 'fixed';
		ta.style.opacity = '0';
		document.body.appendChild(ta);
		ta.focus();
		ta.select();
		try {
			document.execCommand('copy');
			btn.textContent = breznflowAdmin.i18n.copied || 'Copied!';
			setTimeout(function() { btn.textContent = label; }, 2000);
		} catch (e) {
			// silently ignore
		}
		document.body.removeChild(ta);
	}

	attachCopyButtons();

	// ── Step 2: Live shortcode preview ────────────────────────────────────────

	const scLive = document.getElementById('breznflow-shortcode-live');
	if (scLive) {
		const postIdInput = document.querySelector('input[name="breznflow_post_id"]');
		const postId = postIdInput ? postIdInput.value : '';
		const modeRadios = document.querySelectorAll('input[name="default_mode"]');
		const showTitleCb  = document.querySelector('input[name="show_title"]');
		const showInfoCb   = document.querySelector('input[name="show_infobox"]');
		const showDlCb     = document.querySelector('input[name="show_download"]');
		const zoomInput    = document.querySelector('input[name="default_zoom"]');

		function updatePreview() {
			let sc = '[breznflow id="' + postId + '"';
			const modeVal = document.querySelector('input[name="default_mode"]:checked');
			if (modeVal && modeVal.value !== 'visual') sc += ' mode="' + modeVal.value + '"';
			if (zoomInput && zoomInput.value !== '100') sc += ' zoom="' + zoomInput.value + '"';
			if (showTitleCb && !showTitleCb.checked) sc += ' show_title="0"';
			if (showInfoCb && !showInfoCb.checked) sc += ' show_infobox="0"';
			if (showDlCb && showDlCb.checked) sc += ' show_download="1"';
			sc += ']';
			scLive.textContent = sc;

			// Update copy button data attribute
			const copyBtn = scLive.nextElementSibling;
			if (copyBtn && copyBtn.classList.contains('breznflow-copy-sc')) {
				copyBtn.setAttribute('data-sc', sc);
			}
		}

		modeRadios.forEach(function(r) { r.addEventListener('change', updatePreview); });
		if (showTitleCb) showTitleCb.addEventListener('change', updatePreview);
		if (showInfoCb)  showInfoCb.addEventListener('change', updatePreview);
		if (showDlCb)    showDlCb.addEventListener('change', updatePreview);
		if (zoomInput)   zoomInput.addEventListener('input', updatePreview);
	}

}());