import { defineComponent, h } from 'vue'
import JsBarcode from 'jsbarcode'

export default defineComponent({
	name: 'VueBarcode',

	props: {
		/**
		 * The value of the bar code.
		 */
		value: {
			type: String,
			default: undefined
		},

		/**
		 * The options for the bar code generator.
		 * {@link https://github.com/lindell/JsBarcode#options}
		 */
		options: {
			type: Object,
			default: undefined
		},

		/**
		 * The tag name of the component's root element.
		 */
		tag: {
			type: String,
			default: 'canvas'
		}
	},

	watch: {
		$props: {
			deep: true,
			immediate: true,

			/**
			 * Update the bar code when props changed.
			 */
			handler() {
				if (this.$el) {
					this.generate()
				}
			}
		}
	},

	mounted() {
		this.generate()
	},

	methods: {
		/**
		 * Generate bar code.
		 */
		generate() {
			JsBarcode(this.$el, String(this.value), this.options)
		}
	},

	render() {
		return h(this.tag, this.$slots.default)
	}
})