package ui

templ Home() {
	@Layout("Markdown → standalone HTML") {
		<div class="mx-auto max-w-3xl px-6 py-10">
			<header class="mb-8">
				<h1 class="text-2xl font-semibold tracking-tight text-foreground sm:text-[2rem]">Markdown → standalone HTML</h1>
				<p class="mt-1.5 max-w-prose text-sm leading-6 text-muted-foreground">
					Загрузите .md файл или вставьте Markdown-текст. Результат — готовый самодостаточный HTML со встроенными стилями.
				</p>
			</header>

			<form
				id="convert-form"
				class="space-y-6"
				hx-post="/ui/convert"
				hx-target="#result"
				hx-swap="outerHTML"
				hx-encoding="multipart/form-data"
				onreset="window.setTimeout(window.mdToHTMLResetForm, 0)"
			>
				<input id="source-field" type="hidden" name="source" value="file"/>

				<section class="overflow-hidden rounded-xl border border-border bg-background shadow-xs">
					<div class="border-b border-border px-4 py-4">
						<div class="inline-flex items-center gap-1 rounded-lg bg-muted p-1" role="tablist" aria-label="Источник markdown">
							<button
								id="tab-file"
								type="button"
								value="file"
								class="tabs-trigger"
								data-state="active"
								onclick="window.mdToHTMLSetSource('file')"
							>
								@FileIcon("size-3.5")
								<span>Загрузить файл</span>
							</button>
							<button
								id="tab-text"
								type="button"
								value="text"
								class="tabs-trigger"
								onclick="window.mdToHTMLSetSource('text')"
							>
								@AlignLeftIcon("size-3.5")
								<span>Вставить текст</span>
							</button>
						</div>
					</div>

					<div class="p-6">
						<div id="panel-file" class="flex flex-col gap-4">
							<label
								id="markdown-dropzone"
								for="markdown-file"
								class="dropzone group block cursor-pointer rounded-lg border-2 border-dashed border-border p-10 text-center transition hover:border-foreground/25"
							>
								<input
									id="markdown-file"
									type="file"
									name="markdown_file"
									accept=".md,.markdown,.mdown,text/markdown"
									class="sr-only"
									onchange="window.mdToHTMLHandleFileChange(this)"
								/>
								<div class="mx-auto mb-3 grid size-10 place-items-center rounded-full bg-muted text-muted-foreground transition group-hover:bg-primary/5 group-hover:text-foreground">
									@UploadIcon("size-5")
								</div>
								<div class="text-sm font-medium text-foreground">Перетащите .md файл сюда</div>
								<div class="mt-1 text-xs text-muted-foreground">
									или <span class="text-foreground underline underline-offset-2">выберите на диске</span>
								</div>
								<div class="mt-3 text-[11px] text-muted-foreground">Лимит: 200 MB · Тип: text/markdown</div>
							</label>

							<div id="selected-file" class="hidden items-center gap-3 rounded-lg border border-border bg-muted/40 p-3">
								<div class="grid size-9 shrink-0 place-items-center rounded-md border border-border bg-background text-muted-foreground">
									@FileIcon("size-4")
								</div>
								<div class="min-w-0 flex-1">
									<div id="selected-file-name" class="truncate text-sm font-medium text-foreground">README.md</div>
									<div id="selected-file-meta" class="text-xs text-muted-foreground font-mono">3.4 KB · изменён только что</div>
								</div>
								<button
									type="button"
									class="inline-flex size-7 items-center justify-center rounded-md text-muted-foreground transition hover:bg-muted hover:text-foreground"
									aria-label="Удалить файл"
									onclick="window.mdToHTMLClearFile()"
								>
									@CloseIcon("size-4")
								</button>
							</div>
						</div>

						<div id="panel-text" class="hidden flex-col gap-3">
							<label for="markdown-text" class="text-[13px] font-medium text-foreground">Markdown-текст</label>
							<div class="relative">
								<textarea
									id="markdown-text"
									name="markdown_text"
									rows="10"
									class="focus-ring min-h-[16rem] w-full resize-y rounded-md border border-border bg-background px-3 py-2.5 font-mono text-sm leading-6 text-foreground placeholder:text-muted-foreground"
									placeholder="# Мой заголовок&#10;&#10;Здесь будет текст..."
									oninput="window.mdToHTMLUpdateCharCount(this)"
								></textarea>
								<span id="markdown-char-count" class="pointer-events-none absolute bottom-2.5 right-3 text-[10px] text-muted-foreground font-mono">
									0 символов
								</span>
							</div>
							<p class="flex items-center gap-2 text-[11px] text-muted-foreground">
								@InfoIcon("size-3.5")
								<span>Поддерживается CommonMark + GFM</span>
							</p>
						</div>
					</div>

					<div class="flex flex-wrap items-center justify-between gap-3 border-t border-border px-4 py-4">
						<p class="text-xs text-muted-foreground">
							Конвертация использует публичный <code class="font-mono text-foreground">GitHub API</code>
						</p>
						<div class="flex items-center gap-2">
							<button
								type="reset"
								class="focus-ring inline-flex h-9 items-center justify-center rounded-md border border-border bg-background px-3.5 text-sm font-medium text-foreground transition hover:bg-muted"
							>
								Сбросить
							</button>
							<button
								type="submit"
								class="focus-ring inline-flex h-9 items-center justify-center gap-2 rounded-md bg-primary px-4 text-sm font-medium text-primary-foreground transition hover:bg-primary/90"
							>
								<span>Конвертировать</span>
								@ArrowRightIcon("size-4")
							</button>
						</div>
					</div>
				</section>
			</form>

			<div id="result" class="mt-6"></div>

			<section class="mt-6 overflow-hidden rounded-xl border border-border bg-background shadow-xs">
				<div class="flex items-center justify-between border-b border-border px-5 py-3.5">
					<div class="flex items-center gap-2">
						<span class="text-sm font-medium text-foreground">API</span>
						<span class="inline-flex items-center rounded-md border border-border bg-muted px-1.5 py-px text-[10px] font-medium text-foreground font-mono">
							POST /convert
						</span>
					</div>
					<button
						type="button"
						class="focus-ring inline-flex size-7 items-center justify-center rounded-md text-muted-foreground transition hover:bg-muted hover:text-foreground"
						aria-label="Скопировать curl"
						data-copy-target="api-curl"
						data-copy-label="curl"
						onclick="window.mdToHTMLCopyButton(this)"
					>
						@CopyIcon("size-3.5")
					</button>
				</div>
				<textarea id="api-curl" class="sr-only" readonly>curl -X POST http://localhost:8000/convert \
  -H 'Content-Type: application/json' \
  -d '&#123;"markdown":"# Hello"&#125;'</textarea>
				<pre class="overflow-x-auto px-5 py-4 font-mono text-[12px] leading-relaxed text-foreground"><span class="text-muted-foreground">$</span> curl -X POST http://localhost:8000/convert \
  -H 'Content-Type: application/json' \
  -d '&#123;"markdown":"# Hello"&#125;'</pre>
			</section>
		</div>

		<script>
			(() => {
				function byId(id) {
					return document.getElementById(id);
				}

				function formatBytes(bytes) {
					if (bytes < 1024) {
						return bytes + " B";
					}
					return (bytes / 1024).toFixed(1) + " KB";
				}

				function formatRelativeTime(lastModified) {
					const delta = Date.now() - lastModified;
					const minute = 60 * 1000;
					const hour = 60 * minute;
					const day = 24 * hour;

					if (delta < minute) {
						return "изменён только что";
					}
					if (delta < hour) {
						const value = Math.max(1, Math.round(delta / minute));
						return "изменён " + value + " мин назад";
					}
					if (delta < day) {
						const value = Math.max(1, Math.round(delta / hour));
						return "изменён " + value + " ч назад";
					}
					const value = Math.max(1, Math.round(delta / day));
					return "изменён " + value + " дн назад";
				}

				function flashCopyState(button) {
					if (!button) {
						return;
					}
					const original = button.dataset.copyFlashOriginal || button.innerHTML;
					button.dataset.copyFlashOriginal = original;
					button.innerHTML = "Скопировано";
					window.setTimeout(() => {
						button.innerHTML = original;
					}, 1400);
				}

				async function copyText(value) {
					if (navigator.clipboard && window.isSecureContext) {
						await navigator.clipboard.writeText(value);
						return;
					}

					const helper = document.createElement("textarea");
					helper.value = value;
					helper.setAttribute("readonly", "readonly");
					helper.style.position = "absolute";
					helper.style.left = "-9999px";
					document.body.appendChild(helper);
					helper.select();
					document.execCommand("copy");
					document.body.removeChild(helper);
				}

				function bindDropzone() {
					const dropzone = byId("markdown-dropzone");
					const input = byId("markdown-file");
					if (!dropzone || !input || dropzone.dataset.bound === "true") {
						return;
					}

					const activeClasses = ["border-foreground/35", "bg-muted/60"];
					dropzone.dataset.bound = "true";

					dropzone.addEventListener("dragover", (event) => {
						event.preventDefault();
						activeClasses.forEach((className) => dropzone.classList.add(className));
					});
					dropzone.addEventListener("dragleave", () => {
						activeClasses.forEach((className) => dropzone.classList.remove(className));
					});
					dropzone.addEventListener("drop", (event) => {
						event.preventDefault();
						activeClasses.forEach((className) => dropzone.classList.remove(className));
						if (!event.dataTransfer || !event.dataTransfer.files.length) {
							return;
						}
						input.files = event.dataTransfer.files;
						window.mdToHTMLHandleFileChange(input);
					});
				}

				window.mdToHTMLSetSource = function(source) {
					const sourceField = byId("source-field");
					const filePanel = byId("panel-file");
					const textPanel = byId("panel-text");
					const fileTab = byId("tab-file");
					const textTab = byId("tab-text");
					if (!sourceField || !filePanel || !textPanel || !fileTab || !textTab) {
						return;
					}

					const showFile = source === "file";
					sourceField.value = source;
					filePanel.classList.toggle("hidden", !showFile);
					filePanel.classList.toggle("flex", showFile);
					textPanel.classList.toggle("hidden", showFile);
					textPanel.classList.toggle("flex", !showFile);
					fileTab.setAttribute("data-state", showFile ? "active" : "inactive");
					textTab.setAttribute("data-state", showFile ? "inactive" : "active");
				};

				window.mdToHTMLHandleFileChange = function(input) {
					const file = input && input.files && input.files[0];
					const summary = byId("selected-file");
					const fileName = byId("selected-file-name");
					const fileMeta = byId("selected-file-meta");
					if (!summary || !fileName || !fileMeta) {
						return;
					}

					if (!file) {
						summary.classList.add("hidden");
						summary.classList.remove("flex");
						return;
					}

					fileName.textContent = file.name;
					fileMeta.textContent = formatBytes(file.size) + " · " + formatRelativeTime(file.lastModified);
					summary.classList.remove("hidden");
					summary.classList.add("flex");
				};

				window.mdToHTMLClearFile = function() {
					const input = byId("markdown-file");
					const summary = byId("selected-file");
					if (input) {
						input.value = "";
					}
					if (summary) {
						summary.classList.add("hidden");
						summary.classList.remove("flex");
					}
				};

				window.mdToHTMLUpdateCharCount = function(textarea) {
					const counter = byId("markdown-char-count");
					if (!counter || !textarea) {
						return;
					}
					const count = textarea.value.length;
					counter.textContent = count + " символов";
				};

				window.mdToHTMLResetForm = function() {
					window.mdToHTMLSetSource("file");
					window.mdToHTMLClearFile();
					const textarea = byId("markdown-text");
					if (textarea) {
						window.mdToHTMLUpdateCharCount(textarea);
					}
					const result = byId("result");
					if (result) {
						result.innerHTML = "";
					}
				};

				window.mdToHTMLCopyButton = async function(button) {
					if (!button) {
						return;
					}
					const targetID = button.dataset.copyTarget;
					const target = targetID ? byId(targetID) : null;
					const value = target ? target.value || target.textContent || "" : "";
					if (!value) {
						return;
					}
					try {
						await copyText(value);
						flashCopyState(button);
					} catch (_) {
						// noop
					}
				};

				function init() {
					bindDropzone();
					window.mdToHTMLSetSource("file");
					const textarea = byId("markdown-text");
					if (textarea) {
						window.mdToHTMLUpdateCharCount(textarea);
					}
				}

				if (document.readyState === "loading") {
					document.addEventListener("DOMContentLoaded", init, { once: true });
				} else {
					init();
				}
			})();
		</script>
	}
}