import { MglButton } from '@/components';
import { ButtonType } from '@/components/button.component';
import { CustomControl } from '@/components/controls/custom.control';
import { Position, type PositionProp, PositionValues } from '@/components/controls/position.enum';
import { usePositionWatcher } from '@/composable/usePositionWatcher';
import { emitterSymbol, isInitializedSymbol, isLoadedSymbol, mapSymbol, type StyleSwitchItem } from '@/types';
import {
	createCommentVNode,
	createTextVNode,
	defineComponent,
	h,
	inject,
	onBeforeUnmount,
	type PropType,
	type Ref,
	ref,
	shallowRef,
	type SlotsType,
	Teleport,
	watch
} from 'vue';

function isEvent(e: any): e is Event {
	return e && !!(e as Event).stopPropagation;
}

interface SlotProps {
	isOpen: Ref<boolean>,
	toggleOpen: (forceIsOpen?: boolean | Event, e?: Event) => void,
	setStyle: (s: StyleSwitchItem) => void,
	mapStyles: StyleSwitchItem[],
	currentStyle: Ref<StyleSwitchItem | null>,
}

export default /*#__PURE__*/ defineComponent({
	name : 'MglStyleSwitchControl',
	props: {
		position  : {
			type     : String as PropType<PositionProp>,
			validator: (v: Position) => {
				return PositionValues.indexOf(v) !== -1;
			}
		},
		mapStyles : {
			type    : Array as PropType<StyleSwitchItem[]>,
			required: true,
			default : []
		},
		modelValue: {
			type: Object as PropType<StyleSwitchItem>
		},
		isOpen    : {
			type   : Boolean as PropType<boolean>,
			default: undefined
		}
	},
	slots: Object as SlotsType<{ default: SlotProps, button: SlotProps, styleList: SlotProps }>,
	emits: [ 'update:modelValue', 'update:isOpen' ],
	setup(props, { emit, slots }) {

		const map           = inject(mapSymbol)!,
			  isInitialized = inject(isInitializedSymbol)!,
			  isMapLoaded   = inject(isLoadedSymbol)!,
			  emitter       = inject(emitterSymbol)!,
			  isAdded       = ref(false),
			  isOpen        = ref(props.isOpen === undefined ? false : props.isOpen),
			  modelValue    = shallowRef(props.modelValue === undefined ? (props.mapStyles.length ? props.mapStyles[ 0 ] : null) : props.modelValue),
			  control       = new CustomControl(isAdded, false),
			  closer        = toggleOpen.bind(null, false);

		function setStyleByMap() {
			const name = map.value!.getStyle().name;
			for (let i = 0, len = props.mapStyles.length; i < len; i++) {
				if (props.mapStyles[ i ].name === name) {
					setStyle(props.mapStyles[ i ]);
					break;
				}
			}
		}

		watch(isMapLoaded, (v) => {
			if (v) setStyleByMap();
		}, { immediate: true });
		map.value!.on('style.load', setStyleByMap);
		document.addEventListener('click', closer);


		usePositionWatcher(() => props.position, map, control);

		if (props.modelValue !== undefined) {
			watch(() => props.modelValue, v => {
				if (v !== undefined) modelValue.value = v;
			});
		}
		if (props.isOpen !== undefined) {
			watch(() => props.isOpen, v => {
				if (v !== undefined) isOpen.value = v;
			});
		}

		onBeforeUnmount(() => {
			if (isInitialized.value) {
				map.value!.removeControl(control);
				map.value!.off('style.load', setStyleByMap);
			}
			document.removeEventListener('click', closer);
		});

		function setStyle(s: StyleSwitchItem) {
			if (modelValue.value?.name === s.name) {
				return;
			}
			emitter.emit('styleSwitched', s);

			/*
			 * Skip diff as long as Maplibre-GL doesn't fie `style.load` correctly
			 * @see https://github.com/maplibre/maplibre-gl-js/issues/2587
			*/
			map.value!.setStyle(s.style, {diff: false});
			if (props.modelValue === undefined) {
				modelValue.value = s;
			}
			emit('update:modelValue', s);

			toggleOpen(false);
		}

		function toggleOpen(forceIsOpen?: boolean | Event, e?: Event) {
			if (isEvent(e)) {
				e.stopPropagation();
			} else if (isEvent(forceIsOpen)) {
				forceIsOpen.stopPropagation();
			}
			if (props.isOpen !== undefined && props.isOpen === forceIsOpen || isOpen.value === forceIsOpen) {
				return;
			}
			if (props.isOpen === undefined) {
				isOpen.value = typeof forceIsOpen === 'boolean' ? forceIsOpen : !isOpen.value;
				emit('update:isOpen', isOpen.value);
			} else {
				emit('update:isOpen', typeof forceIsOpen === 'boolean' ? forceIsOpen : !props.isOpen);
			}
		}

		return () => {
			if (!isAdded.value) {
				return createCommentVNode('style-switch-control');
			}

			const slotProps: SlotProps = {
				isOpen, toggleOpen, setStyle,
				mapStyles   : props.mapStyles,
				currentStyle: modelValue,
			};

			return h(
				Teleport as any,
				{ to: control.container },
				slots.default
					? slots.default(slotProps)
					: [
						slots.button
							? slots.button(slotProps)
							: h(MglButton, {
								type   : ButtonType.MDI,
								path   : 'M12,18.54L19.37,12.8L21,14.07L12,21.07L3,14.07L4.62,12.81L12,18.54M12,16L3,9L12,2L21,9L12,16M12,4.53L6.26,9L12,13.47L17.74,9L12,4.53Z',
								'class': [ 'maplibregl-ctrl-icon maplibregl-style-switch', isOpen.value ? 'is-open' : '' ],
								onClick: toggleOpen.bind(null, true)
							}),
						slots.styleList
							? slots.styleList(slotProps)
							: h(
								'div',
								{ 'class': [ 'maplibregl-style-list', isOpen.value ? 'is-open' : '' ] },
								props.mapStyles.map((s) => {
									return s.icon
										? h(MglButton, {
											type   : ButtonType.MDI,
											path   : s.icon.path,
											'class': modelValue.value?.name === s.name ? 'is-active' : '',
											onClick: () => setStyle(s)
										}, createTextVNode(s.label))
										: h('button', {
											type   : 'button',
											'class': modelValue.value?.name === s.name ? 'is-active' : '',
											onClick: () => setStyle(s)
										}, createTextVNode(s.label));

								})
							)
					]
			);
		};

	},
	// just only for code assist
	template: `
		<slot>
		<slot name="button"></slot>
		<slot name="styleList"></slot>
		</slot>
	`
});