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<script lang="ts">
	import { onDestroy } from "svelte";
	import { Copy, Check } from "@gradio/icons";

	let copied = false;
	export let value: string;
	let timer: NodeJS.Timeout;

	function copy_feedback(): void {
		copied = true;
		if (timer) clearTimeout(timer);
		timer = setTimeout(() => {
			copied = false;
		}, 2000);
	}

	async function handle_copy(): Promise<void> {
		if ("clipboard" in navigator) {
			await navigator.clipboard.writeText(value);
			copy_feedback();
		} else {
			const textArea = document.createElement("textarea");
			textArea.value = value;

			textArea.style.position = "absolute";
			textArea.style.left = "-999999px";

			document.body.prepend(textArea);
			textArea.select();

			try {
				document.execCommand("copy");
				copy_feedback();
			} catch (error) {
				console.error(error);
			} finally {
				textArea.remove();
			}
		}
	}

	onDestroy(() => {
		if (timer) clearTimeout(timer);
	});
</script>

<button
	on:click={handle_copy}
	class="action"
	title="copy"
	aria-label={copied ? "Copied message" : "Copy message"}
>
	{#if !copied}
		<Copy />
	{/if}
	{#if copied}
		<Check />
	{/if}
</button>

<style>
	button {
		position: relative;
		top: 0;
		right: 0;
		cursor: pointer;
		color: var(--body-text-color-subdued);
		margin-right: 5px;
	}

	button:hover {
		color: var(--body-text-color);
	}

	.action {
		width: 15px;
		height: 14px;
	}
</style>