/**
 * pill-search.js — generalized pill-based search component for tags and languages.
 *
 * Initialisez avec un conteneur ayant l'attribut data-pill-search :
 *   <div data-pill-search data-pill-name="tag" data-pill-max="10" data-pill-min="3" data-pill-required="1">
 *
 * DOM attendu à l'intérieur du conteneur :
 *   - .tag-search-pills     → conteneur des pills
 *   - .tag-search-input     → champ de recherche (avec hx-post, hx-trigger, etc.)
 *   - .tag-search-suggestions → dropdown
 *   - .tag-search-count      → compteur
 *   - .tag-search-counter    → wrapper du compteur
 *   - .tag-search-input-wrap → wrapper du champ de recherche
 *   - .tag-search-max-msg    → message "maximum atteint"
 *
 * Options (par attribut data) :
 *   data-pill-name     → nom pour les inputs cachés (ex: "tag", "language_autre")
 *   data-pill-max      → max pills (default 10)
 *   data-pill-min      → min pills requis (default 0)
 *   data-pill-required → si "1", active l'affichage du minimum
 *   data-pill-role     → "tag" (lowercase) ou "lang" (ucfirst)
 */
(() => {
	function initAll() {
		document
			.querySelectorAll(
				"[data-pill-search]:not([data-pill-search-initialized])",
			)
			.forEach((container) => {
				container.setAttribute("data-pill-search-initialized", "1");
				initPillSearch(container);
			});
	}

	document.addEventListener("DOMContentLoaded", initAll);
	document.body.addEventListener("htmx:afterSwap", initAll);

	function initPillSearch(container) {
		var pills = container.querySelector(".tag-search-pills");
		var search = container.querySelector(".tag-search-input");
		var dropdown = container.querySelector(".tag-search-suggestions");
		var countEl = container.querySelector(".tag-search-count");
		var counter = container.querySelector(".tag-search-counter");
		var maxTags = parseInt(container.getAttribute("data-pill-max"), 10) || 10;
		var minTags = parseInt(container.getAttribute("data-pill-min"), 10) || 0;
		var required = container.getAttribute("data-pill-required") === "1";
		var inputName = container.getAttribute("data-pill-name") || "tag";
		var _role = container.getAttribute("data-pill-role") || "tag";
		var selectedIdx = -1;

		if (!pills || !search || !dropdown) return;

		function normalize(name) {
			return name.trim().replace(/\s+/g, " ").toLowerCase();
		}

		function pillAlreadyExists(name) {
			var norm = normalize(name);
			var existing = pills.querySelectorAll(".tag-pill-name");
			for (let i = 0; i < existing.length; i++) {
				if (normalize(existing[i].textContent) === norm) return true;
			}
			return false;
		}

		function updateCount() {
			var n = pills.querySelectorAll(".tag-pill").length;
			var suffix = required ? ` (min ${minTags})` : "";
			if (countEl) countEl.textContent = `${n}/${maxTags}${suffix}`;
			if (counter) counter.style.display = n > 0 || required ? "" : "none";
			if (countEl && required) {
				countEl.style.color =
					n < minTags ? "var(--text-danger)" : "var(--accent)";
			}

			var wrap = container.querySelector(".tag-search-input-wrap");
			var maxMsg = container.querySelector(".tag-search-max-msg");
			if (n >= maxTags) {
				if (wrap) wrap.style.display = "none";
				if (maxMsg) maxMsg.style.display = "";
			} else {
				if (wrap) {
					wrap.style.display = "";
					if (search) search.style.display = "";
				}
				if (maxMsg) maxMsg.style.display = "none";
			}
		}

		pills.addEventListener("click", (e) => {
			var btn = e.target.closest(".tag-pill-remove");
			if (!btn) return;
			var pill = btn.closest(".tag-pill");
			pill.remove();
			updateCount();
			var wrap = container.querySelector(".tag-search-input-wrap");
			var inp = container.querySelector(".tag-search-input");
			if (wrap && inp) {
				wrap.style.display = "";
				inp.style.display = "";
			}
		});

		function highlight(idx) {
			var items = dropdown.querySelectorAll(".tag-search-item");
			for (let i = 0; i < items.length; i++) {
				items[i].classList.toggle("tag-search-item--highlight", i === idx);
			}
		}

		function selectPill(btn) {
			var name = normalize(btn.getAttribute("data-tag-name") || "");
			if (!name) return;
			if (pillAlreadyExists(name)) return;
			if (pills.querySelectorAll(".tag-pill").length >= maxTags) return;

			var escaped = htmlEscape(name);
			var pill = document.createElement("span");
			pill.className = "tag-pill";
			pill.innerHTML =
				'<input type="hidden" name="' +
				inputName +
				'[]" value="' +
				escaped +
				'">' +
				'<span class="tag-pill-name">' +
				escaped +
				"</span>" +
				'<button type="button" class="tag-pill-remove" title="Retirer \u00AB\u00A0' +
				escaped +
				'\u00A0\u00BB" aria-label="Retirer ' +
				escaped +
				'">' +
				'<svg width="16" height="16" fill="currentColor" viewBox="0 0 256 256"><path d="M216,48H176V40a24,24,0,0,0-24-24H104A24,24,0,0,0,80,40v8H40a8,8,0,0,0,0,16h8V208a16,16,0,0,0,16,16H192a16,16,0,0,0,16-16V64h8a8,8,0,0,0,0-16ZM112,168V104a8,8,0,0,1,16,0v64a8,8,0,0,1-16,0Zm48,0V104a8,8,0,0,1,16,0v64a8,8,0,0,1-16,0Z"></path></svg>' +
				"</button>";
			pills.appendChild(pill);
			updateCount();
			search.value = "";
			dropdown.innerHTML = "";
			selectedIdx = -1;
			search.focus();
		}

		dropdown.addEventListener("click", (e) => {
			var btn = e.target.closest(".tag-search-item");
			if (!btn) return;
			selectPill(btn);
		});

		search.addEventListener("keydown", (e) => {
			var items = dropdown.querySelectorAll(".tag-search-item");
			if (e.key === "ArrowDown" || e.key === "ArrowUp") {
				e.preventDefault();
				if (items.length === 0) return;
				if (e.key === "ArrowDown") {
					selectedIdx = (selectedIdx + 1) % items.length;
				} else {
					selectedIdx = selectedIdx <= 0 ? items.length - 1 : selectedIdx - 1;
				}
				highlight(selectedIdx);
			} else if (e.key === "Enter") {
				// Always prevent Enter from submitting the form.
				// If there are no suggestions (e.g., "anglais" in language
				// search — excluded main language), the Enter key would
				// otherwise propagate to the form and trigger its hx-post to
				// draft.php, causing the JSON response to replace the form
				// content.
				e.preventDefault();
				if (items.length > 0) {
					if (selectedIdx >= 0 && selectedIdx < items.length) {
						selectPill(items[selectedIdx]);
					} else {
						selectPill(items[0]);
					}
				}
			} else if (e.key === "Escape") {
				dropdown.innerHTML = "";
				selectedIdx = -1;
			}
		});

		search.addEventListener("blur", () => {
			setTimeout(() => {
				if (!dropdown.contains(document.activeElement)) {
					dropdown.innerHTML = "";
					selectedIdx = -1;
				}
			}, 150);
		});

		function htmlEscape(str) {
			var el = document.createElement("span");
			el.textContent = str;
			return el.innerHTML;
		}
	}
})();