import { defineComponent, h, type PropType, ref, type SlotsType, warn, watch } from 'vue';

export enum ButtonType {
	DEFAULT     = 'default',
	TEXT        = 'text',
	MDI         = 'mdi',
	SIMPLE_ICON = 'simple-icons',
}

export const ButtonTypeValues = Object.values(ButtonType);

interface Default {
	size: number;
	viewbox: string;
}

const types: { [key in ButtonType]?: Default } = {
	[ ButtonType.TEXT ]       : undefined,
	[ ButtonType.MDI ]        : {
		size   : 21,
		viewbox: '0 0 24 24'
	},
	[ ButtonType.SIMPLE_ICON ]: {
		size   : 21,
		viewbox: '0 0 24 24'
	},
	[ ButtonType.DEFAULT ]    : {
		size   : 0,
		viewbox: '0 0 0 0'
	}
};


export default /*#__PURE__*/ defineComponent({
	name : 'MglButton',
	props: {
		type   : {
			type     : String as PropType<ButtonType | 'default' | 'text' | 'mdi' | 'simple-icons'>,
			default  : ButtonType.DEFAULT,
			validator: (v: ButtonType) => {
				return ButtonTypeValues.indexOf(v) !== -1;
			}
		},
		path   : {
			type: String as PropType<string>
		},
		size   : Number as PropType<number>,
		viewbox: String as PropType<string>
	},
	slots: Object as SlotsType<{ default: {} }>,
	setup(props, { slots }) {

		if (!props.path && props.type !== ButtonType.TEXT) {
			warn('property `path` must be set on MaplibreButton');
		}

		const defaults = ref(types[ props.type ] || types.default);
		watch(() => props.type, v => defaults.value = types[ v ] || types.default);

		return () => {
			if (props.type === ButtonType.TEXT) {
				return h('button', { type: 'button' }, slots.default?.({}));
			}
			return h('button', { type: 'button', 'class': 'maplibregl-ctrl-icon' },
				[
					h(
						'svg',
						{
							width  : props.size || defaults.value!.size,
							height : props.size || defaults.value!.size,
							viewBox: props.viewbox || defaults.value!.viewbox
						},
						h('path', { fill: 'currentColor', d: props.path })
					),
					slots.default?.({})
				]
			);
		};

	}
});