/**
 * file-upload-queue.js
 *
 * Client-side file upload queues for TFE, Video, Audio, and Annexe files.
 * Replaces the old HTMX+PHP session-backed queue system.
 *
 * Queues:
 *   tfe    — main thesis files (multi-format)
 *   video  — video files (non-PeerTube path)
 *   audio  — audio files (non-PeerTube path)
 *   annexe — annex files
 *
 * Architecture:
 *   1. Intercept 'change' on all .tfe-file-picker inputs.
 *   2. Validate MIME/extension/size client-side.
 *   3. Store File objects in window.__xamxamQueues.
 *   4. Render queue UI with SortableJS drag-to-reorder.
 *   5. On form submit: inject all queued files into FormData and POST normally.
 *
 * The queue containers are rendered server-side by fichiers-fragment.php
 * as empty <ul> elements with standard IDs.  This script populates them.
 */

(function () {
	"use strict";

	// ── Constants ──────────────────────────────────────────────────────────

	var ICON = {
		pdf: "\uD83D\uDCC4",
		video: "\uD83C\uDFAC",
		audio: "\uD83D\uDD0A",
		zip: "\uD83D\uDDDC\uFE0F",
		vtt: "\uD83D\uDCAC",
		image: "\uD83D\uDDBC\uFE0F",
		other: "\uD83D\uDCCE",
	};

	var QUEUE_TYPES = ["tfe", "video", "audio", "annexe"];

	var ALLOWED_BY_TYPE = {
		tfe: {
			exts: ["jpg","jpeg","png","gif","webp","pdf","mp4","webm","ogv","mov","mp3","ogg","oga","wav","flac","aac","m4a","vtt","zip","tar","gz","tgz"],
			maxSize: function (f) { return (/\.pdf$/i.test(f.name) ? 100 : 500) * 1024 * 1024; },
		},
		video: {
			exts: ["mp4","webm","ogv","mov"],
			maxSize: function () { return 500 * 1024 * 1024; },
		},
		audio: {
			exts: ["mp3","ogg","oga","wav","flac","aac","m4a"],
			maxSize: function () { return 500 * 1024 * 1024; },
		},
		annexe: {
			exts: ["pdf","zip","tar","gz","tgz"],
			maxSize: function () { return 500 * 1024 * 1024; },
		},
	};

	// ── State ──────────────────────────────────────────────────────────────

	if (!window.__xamxamQueues) {
		window.__xamxamQueues = {};
	}
	var queues = window.__xamxamQueues;
	QUEUE_TYPES.forEach(function (qt) {
		if (!Array.isArray(queues[qt])) queues[qt] = [];
	});

	// ── Helpers ────────────────────────────────────────────────────────────

	function iconFor(file) {
		var t = (file.type || "").toLowerCase(),
			n = (file.name || "").toLowerCase();
		if (/^image\//.test(t)) return ICON.image;
		if (t === "application/pdf" || /\.pdf$/.test(n)) return ICON.pdf;
		if (/^video\//.test(t) || /\.(mp4|webm|mov|ogv)$/.test(n)) return ICON.video;
		if (/^audio\//.test(t) || /\.(mp3|ogg|oga|wav|flac|aac|m4a)$/.test(n)) return ICON.audio;
		if (/\.(zip|tar|gz|tgz)$/.test(n)) return ICON.zip;
		if (/\.vtt$/.test(n)) return ICON.vtt;
		return ICON.other;
	}

	function humanSize(b) {
		return b >= 1073741824
			? (b / 1073741824).toFixed(2) + " GB"
			: b >= 1048576
				? (b / 1048576).toFixed(2) + " MB"
				: b >= 1024
					? (b / 1024).toFixed(1) + " KB"
					: b + " B";
	}

	function esc(s) {
		return s.replace(/[&<>"]/g, function (c) {
			return { "&": "&amp;", "<": "&lt;", ">": "&gt;", '"': "&quot;" }[c];
		});
	}

	function ext(fn) {
		var m = fn.match(/\.([^./]+)$/);
		return m ? m[1].toLowerCase() : "";
	}

	function genFileId() {
		return "fq_" + Math.random().toString(36).slice(2, 10) + "_" + Date.now().toString(36);
	}

	// ── Validation ─────────────────────────────────────────────────────────

	function validateFile(file, queueType) {
		var rules = ALLOWED_BY_TYPE[queueType];
		if (!rules) return "Type de file d'attente inconnu.";

		var fileExt = ext(file.name);
		if (fileExt && rules.exts.indexOf(fileExt) === -1) {
			return "Type de fichier non accepté : ." + fileExt + " (" + file.name + ")";
		}

		var max = rules.maxSize(file);
		if (file.size > max) {
			var maxMb = Math.round(max / 1024 / 1024);
			return "Fichier trop volumineux (" + (file.size / 1024 / 1024).toFixed(1) + " MB). Maximum : " + maxMb + " MB.";
		}

		return null;
	}

	// ── Rendering ──────────────────────────────────────────────────────────

	function getQueueContainerId(qt) {
		return {
			tfe:    "tfe-file-queue-container",
			video:  "video-file-queue-container",
			audio:  "audio-file-queue-container",
			annexe: "annexe-file-queue-container",
		}[qt];
	}

	function getQueueUlId(qt) {
		return {
			tfe:    "tfe-file-queue",
			video:  "video-file-queue",
			audio:  "audio-file-queue",
			annexe: "annexe-file-queue",
		}[qt];
	}

	function getEmptyId(qt) {
		return {
			tfe:    "tfe-file-queue-empty",
			video:  "video-file-queue-empty",
			audio:  "audio-file-queue-empty",
			annexe: "annexe-file-queue-empty",
		}[qt];
	}

	function renderQueue(queueType) {
		var container = document.getElementById(getQueueContainerId(queueType));
		if (!container) return;

		var files = queues[queueType];
		var ulId   = getQueueUlId(queueType);
		var emptyId  = getEmptyId(queueType);

		var html = '<ul id="' + ulId + '" class="tfe-file-queue" aria-label="Fichiers sélectionnés">';
		for (var i = 0; i < files.length; i++) {
			var f  = files[i];
			var ic = iconFor(f);
			var id = f.__xamxamId || "";
			html += '<li class="fq-item" data-fq-id="' + id + '">' +
				'<span class="fq-drag-handle" aria-hidden="true">&#8942;</span>' +
				'<span class="fq-icon">' + ic + '</span>' +
				'<span class="fq-info">' +
				'<span class="fq-name">' + esc(f.name) + '</span>' +
				'<span class="fq-size">' + humanSize(f.size) + '</span>' +
				'</span>' +
				'<button type="button" class="admin-btn-remove fq-remove"' +
				' aria-label="Retirer ' + esc(f.name) + '"' +
				' data-action="xamxam-remove"' +
				' data-queue="' + queueType + '"' +
				' data-file-id="' + id + '">&#x2715;</button>' +
				'</li>';
		}
		html += '</ul>';

		var emptyStyle = files.length > 0 ? ' style="display:none"' : '';
		html += '<p id="' + emptyId + '" class="tfe-queue-empty"' + emptyStyle + '>Aucun fichier sélectionné.</p>';

		container.innerHTML = html;

		// Wire Sortable
		if (window.Sortable && files.length > 1) {
			var list = container.querySelector("ul.tfe-file-queue");
			if (list) {
				Sortable.create(list, {
					handle: ".fq-drag-handle",
					animation: 150,
					onEnd: function () {
						reorderFromDOM(queueType);
					},
				});
			}
		}

		// Mark form as dirty
		markDirty();
	}

	function reorderFromDOM(queueType) {
		var container = document.getElementById(getQueueContainerId(queueType));
		if (!container) return;
		var ids = Array.from(container.querySelectorAll("[data-fq-id]")).map(function (li) { return li.dataset.fqId; });
		var files = queues[queueType];
		var byId = {};
		files.forEach(function (f) { byId[f.__xamxamId] = f; });
		var reordered = ids.map(function (id) { return byId[id]; }).filter(Boolean);
		files.forEach(function (f) {
			if (reordered.indexOf(f) === -1) reordered.push(f);
		});
		queues[queueType] = reordered;
		markDirty();
	}

	// ── Operations ─────────────────────────────────────────────────────────

	function addFiles(queueType, newFiles) {
		var errors = [];
		var addedFiles = [];
		for (var i = 0; i < newFiles.length; i++) {
			var err = validateFile(newFiles[i], queueType);
			if (err) {
				errors.push(err);
			} else {
				newFiles[i].__xamxamId = genFileId();
				addedFiles.push(newFiles[i]);
			}
		}

		if (addedFiles.length > 0) {
			queues[queueType] = queues[queueType].concat(addedFiles);
			renderQueue(queueType);
		}

		return errors;
	}

	function removeFile(queueType, fileId) {
		var idx = -1;
		for (var i = 0; i < queues[queueType].length; i++) {
			if (queues[queueType][i].__xamxamId === fileId) { idx = i; break; }
		}
		if (idx >= 0) {
			queues[queueType].splice(idx, 1);
			renderQueue(queueType);
		}
	}

	// ── FormData injection on submit ───────────────────────────────────────

	function injectQueuesIntoFormData(form, nativeFormData) {
		var fd = nativeFormData || new FormData();
		QUEUE_TYPES.forEach(function (qt) {
			var files = queues[qt];
			for (var i = 0; i < files.length; i++) {
				fd.append("queue_file[" + qt + "][]", files[i], files[i].name);
			}
		});

		// Append queue order hints so the server can validate user ordering
		QUEUE_TYPES.forEach(function (qt) {
			var ids = queues[qt].map(function (f) { return f.__xamxamId; });
			if (ids.length > 0) {
				fd.append("queue_order[" + qt + "]", JSON.stringify(ids));
			}
		});

		return fd;
	}

	// ── Dirty tracking integration ─────────────────────────────────────────

	function markDirty() {
		// Set a global flag that beforeunload-guard.js can check
		window.__xamxamDirty = true;
	}

	function markClean() {
		window.__xamxamDirty = false;
	}

	// ── Validate callback for inline validation fragments ──────────────────

	function showValidationMsg(input, msg) {
		// Find the .file-validation-msg element scoped to this input's form
		var form = input.closest(".file-validation-form");
		var msgEl = form ? form.querySelector(".file-validation-msg") : null;
		if (msgEl) {
			msgEl.innerHTML = '<span class="file-validation-error">' + esc(msg) + '</span>';
		}
	}

	function clearValidationMsg(input) {
		var form = input.closest(".file-validation-form");
		var msgEl = form ? form.querySelector(".file-validation-msg") : null;
		if (msgEl) {
			msgEl.innerHTML = "";
		}
	}

	// ── Binding ────────────────────────────────────────────────────────────

	function bindQueueInputs() {
		document.querySelectorAll(".tfe-file-picker").forEach(function (input) {
			if (input.dataset.xamxamBound) return;
			input.dataset.xamxamBound = "1";

			var queueType = null;
			// Determine queue type from input attributes
			if (input.id === "tfe-files-input") queueType = "tfe";
			else if (input.id === "video-files-input") queueType = "video";
			else if (input.id === "audio-files-input") queueType = "audio";
			else if (input.id === "annexe-files-input") queueType = "annexe";
			else if (input.getAttribute("hx-vals")) {
				// Legacy: try to parse from hx-vals
				try {
					var vals = JSON.parse(input.getAttribute("hx-vals"));
					if (vals && vals.queue_type && QUEUE_TYPES.indexOf(vals.queue_type) >= 0) {
						queueType = vals.queue_type;
					}
				} catch (_) { /* ignore */ }
			}

			if (!queueType) return;

			input.addEventListener("change", function () {
				clearValidationMsg(input);
				var files = Array.from(input.files || []);
				var errors = addFiles(queueType, files);
				if (errors.length > 0) {
					showValidationMsg(input, errors.join("; "));
				}
				// Reset file input so the same file can be re-selected
				input.value = "";
			});
		});
	}

	/**
	 * Delegate click events for remove buttons (these are regenerated on
	 * every renderQueue call, so live delegation is needed).
	 */
	function bindRemoveButtons() {
		document.addEventListener("click", function (e) {
			var btn = e.target.closest("button[data-action='xamxam-remove']");
			if (!btn) return;
			e.preventDefault();
			var qt = btn.getAttribute("data-queue");
			var fid = btn.getAttribute("data-file-id");
			if (qt && fid) removeFile(qt, fid);
		});
	}

	// ── Form submit interception ───────────────────────────────────────────

	function bindFormSubmit() {
		document.querySelectorAll("form[data-beforeunload-guard]").forEach(function (form) {
			if (form.dataset.xamxamFormBound) return;
			form.dataset.xamxamFormBound = "1";

			form.addEventListener("submit", function (e) {
				var hasFiles = QUEUE_TYPES.some(function (qt) { return queues[qt].length > 0; });
				if (!hasFiles) return; // Normal submit

				// Check if the form can accept multipart
				if (form.enctype !== "multipart/form-data") return;

				e.preventDefault();

				// Build FormData from form fields + inject queued files
				var fd = new FormData(form);

				// Remove stale file input artifacts (consumed by change handler)
				QUEUE_TYPES.forEach(function (qt) {
					fd.delete("tfe");
					fd.delete("video");
					fd.delete("audio");
					fd.delete("annexe");
				});

				fd = injectQueuesIntoFormData(form, fd);

				markClean();

				// Use fetch so we can inspect the response before navigation.
				// The server either redirects (302 → we navigate to that URL)
				// or returns the form page with errors (200 → replace the page).
				fetch(form.getAttribute("action") || "", {
					method: "POST",
					body: fd,
					redirect: "manual",
				}).then(function (resp) {
					if (resp.type === "opaqueredirect" || resp.status === 302 || resp.status === 301) {
						// Browser redirect — navigate the whole page
						window.location.href = resp.headers.get("Location") || form.getAttribute("action");
						return;
					}
					// Success or error — render the HTML response
					return resp.text();
				}).then(function (html) {
					if (!html) return;
					document.open();
					document.write(html);
					document.close();
					// Re-bind after DOM replacement (for error re-renders)
					setTimeout(window.XamxamInitFileUploads, 0);
				}).catch(function () {
					// Network error — fall back to native submit
					form.submit();
				});
			});
		});
	}

	// ── Public API (called by HTMX afterSwap scripts) ──────────────────────

	window.XamxamInitFileUploads = function () {
		bindQueueInputs();
	};

	window.XamxamInitQueues = function () {
		// Re-render all queues from in-memory state (used when format switching
		// replaces the queues container via HTMX).
		QUEUE_TYPES.forEach(function (qt) {
			var container = document.getElementById(getQueueContainerId(qt));
			if (container && queues[qt].length > 0) {
				renderQueue(qt);
			}
		});
	};

	// ── Bootstrap ──────────────────────────────────────────────────────────

	bindRemoveButtons();
	bindFormSubmit();

	if (document.readyState === "loading") {
		document.addEventListener("DOMContentLoaded", window.XamxamInitFileUploads);
	} else {
		window.XamxamInitFileUploads();
	}
})();