<template>
<transition :name="$store.state.animation ? (type === 'drawer') ? 'modal-drawer' : (type === 'popup') ? 'modal-popup' : 'modal' : ''" :duration="$store.state.animation ? 200 : 0" appear @after-leave="emit('closed')" @enter="emit('opening')" @after-enter="onOpened">
	<div v-show="manualShowing != null ? manualShowing : showing" v-hotkey.global="keymap" class="qzhlnise" :class="{ drawer: type === 'drawer', dialog: type === 'dialog' || type === 'dialog:top', popup: type === 'popup' }" :style="{ zIndex, pointerEvents: (manualShowing != null ? manualShowing : showing) ? 'auto' : 'none', '--transformOrigin': transformOrigin }">
		<div class="bg _modalBg" :class="{ transparent: transparentBg && (type === 'popup') }" :style="{ zIndex }" @click="onBgClick" @contextmenu.prevent.stop="() => {}"></div>
		<div ref="content" class="content" :class="{ fixed, top: type === 'dialog:top' }" :style="{ zIndex }" @click.self="onBgClick">
			<slot :max-height="maxHeight" :type="type"></slot>
		</div>
	</div>
</transition>
</template>

<script lang="ts" setup>
import { nextTick, onMounted, computed, ref, watch, provide } from 'vue';
import * as os from '@/os';
import { isTouchUsing } from '@/scripts/touch';
import { defaultStore } from '@/store';
import { deviceKind } from '@/scripts/device-kind';

function getFixedContainer(el: Element | null): Element | null {
	if (el == null || el.tagName === 'BODY') return null;
	const position = window.getComputedStyle(el).getPropertyValue('position');
	if (position === 'fixed') {
		return el;
	} else {
		return getFixedContainer(el.parentElement);
	}
}

type ModalTypes = 'popup' | 'dialog' | 'dialog:top' | 'drawer';

const props = withDefaults(defineProps<{
	manualShowing?: boolean | null;
	anchor?: { x: string; y: string; };
	src?: HTMLElement;
	preferType?: ModalTypes | 'auto';
	zPriority?: 'low' | 'middle' | 'high';
	noOverlap?: boolean;
	transparentBg?: boolean;
}>(), {
	manualShowing: null,
	src: null,
	anchor: () => ({ x: 'center', y: 'bottom' }),
	preferType: 'auto',
	zPriority: 'low',
	noOverlap: true,
	transparentBg: false,
});

const emit = defineEmits<{
	(ev: 'opening'): void;
	(ev: 'opened'): void;
	(ev: 'click'): void;
	(ev: 'esc'): void;
	(ev: 'close'): void;
	(ev: 'closed'): void;
}>();

provide('modal', true);

const maxHeight = ref<number>();
const fixed = ref(false);
const transformOrigin = ref('center');
const showing = ref(true);
const content = ref<HTMLElement>();
const zIndex = os.claimZIndex(props.zPriority);
const type = computed(() => {
	if (props.preferType === 'auto') {
		if (!defaultStore.state.disableDrawer && isTouchUsing && deviceKind === 'smartphone') {
			return 'drawer';
		} else {
			return props.src != null ? 'popup' : 'dialog';
		}
	} else {
		return props.preferType!;
	}
});

let contentClicking = false;

const close = () => {
	// eslint-disable-next-line vue/no-mutating-props
	if (props.src) props.src.style.pointerEvents = 'auto';
	showing.value = false;
	emit('close');
};

const onBgClick = () => {
	if (contentClicking) return;
	emit('click');
};

if (type.value === 'drawer') {
	maxHeight.value = window.innerHeight / 1.5;
}

const keymap = {
	'esc': () => emit('esc'),
};

const MARGIN = 16;

const align = () => {
	if (props.src == null) return;
	if (type.value === 'drawer') return;
	if (type.value === 'dialog') return;

	const popover = content.value!;
	if (popover == null) return;

	const srcRect = props.src.getBoundingClientRect();
	
	const width = popover.offsetWidth;
	const height = popover.offsetHeight;

	let left;
	let top;

	const x = srcRect.left + (fixed.value ? 0 : window.pageXOffset);
	const y = srcRect.top + (fixed.value ? 0 : window.pageYOffset);

	if (props.anchor.x === 'center') {
		left = x + (props.src.offsetWidth / 2) - (width / 2);
	} else if (props.anchor.x === 'left') {
		// TODO
	} else if (props.anchor.x === 'right') {
		left = x + props.src.offsetWidth;
	}

	if (props.anchor.y === 'center') {
		top = (y - (height / 2));
	} else if (props.anchor.y === 'top') {
		// TODO
	} else if (props.anchor.y === 'bottom') {
		top = y + props.src.offsetHeight;
	}

	if (fixed.value) {
		// 画面から横にはみ出る場合
		if (left + width > window.innerWidth) {
			left = window.innerWidth - width;
		}

		const underSpace = (window.innerHeight - MARGIN) - top;
		const upperSpace = (srcRect.top - MARGIN);

		// 画面から縦にはみ出る場合
		if (top + height > (window.innerHeight - MARGIN)) {
			if (props.noOverlap && props.anchor.x === 'center') {
				if (underSpace >= (upperSpace / 3)) {
					maxHeight.value = underSpace;
				} else {
					maxHeight.value = upperSpace;
					top = (upperSpace + MARGIN) - height;
				}
			} else {
				top = (window.innerHeight - MARGIN) - height;
			}
		} else {
			maxHeight.value = underSpace;
		}
	} else {
		// 画面から横にはみ出る場合
		if (left + width - window.pageXOffset > window.innerWidth) {
			left = window.innerWidth - width + window.pageXOffset - 1;
		}

		const underSpace = (window.innerHeight - MARGIN) - (top - window.pageYOffset);
		const upperSpace = (srcRect.top - MARGIN);

		// 画面から縦にはみ出る場合
		if (top + height - window.pageYOffset > (window.innerHeight - MARGIN)) {
			if (props.noOverlap && props.anchor.x === 'center') {
				if (underSpace >= (upperSpace / 3)) {
					maxHeight.value = underSpace;
				} else {
					maxHeight.value = upperSpace;
					top = window.pageYOffset + ((upperSpace + MARGIN) - height);
				}
			} else {
				top = (window.innerHeight - MARGIN) - height + window.pageYOffset - 1;
			}
		} else {
			maxHeight.value = underSpace;
		}
	}

	if (top < 0) {
		top = MARGIN;
	}

	if (left < 0) {
		left = 0;
	}

	let transformOriginX = 'center';
	let transformOriginY = 'center';

	if (top >= srcRect.top + props.src.offsetHeight + (fixed.value ? 0 : window.pageYOffset)) {
		transformOriginY = 'top';
	} else if ((top + height) <= srcRect.top + (fixed.value ? 0 : window.pageYOffset)) {
		transformOriginY = 'bottom';
	}

	if (left >= srcRect.left + props.src.offsetWidth + (fixed.value ? 0 : window.pageXOffset)) {
		transformOriginX = 'left';
	} else if ((left + width) <= srcRect.left + (fixed.value ? 0 : window.pageXOffset)) {
		transformOriginX = 'right';
	}

	transformOrigin.value = `${transformOriginX} ${transformOriginY}`;

	popover.style.left = left + 'px';
	popover.style.top = top + 'px';
};

const onOpened = () => {
	emit('opened');

	// モーダルコンテンツにマウスボタンが押され、コンテンツ外でマウスボタンが離されたときにモーダルバックグラウンドクリックと判定させないためにマウスイベントを監視しフラグ管理する
	const el = content.value!.children[0];
	el.addEventListener('mousedown', ev => {
		contentClicking = true;
		window.addEventListener('mouseup', ev => {
			// click イベントより先に mouseup イベントが発生するかもしれないのでちょっと待つ
			window.setTimeout(() => {
				contentClicking = false;
			}, 100);
		}, { passive: true, once: true });
	}, { passive: true });
};

onMounted(() => {
	watch(() => props.src, async () => {
		if (props.src) {
			// eslint-disable-next-line vue/no-mutating-props
			props.src.style.pointerEvents = 'none';
		}
		fixed.value = (type.value === 'drawer') || (getFixedContainer(props.src) != null);

		await nextTick();
		
		align();
	}, { immediate: true });

	nextTick(() => {
		const popover = content.value;
		new ResizeObserver((entries, observer) => {
			align();
		}).observe(popover!);
	});
});

defineExpose({
	close,
});
</script>

<style lang="scss" scoped>
.modal-enter-active, .modal-leave-active {
	> .bg {
		transition: opacity 0.2s !important;
	}

	> .content {
		transform-origin: var(--transformOrigin);
		transition: opacity 0.2s, transform 0.2s !important;
	}
}
.modal-enter-from, .modal-leave-to {
	> .bg {
		opacity: 0;
	}

	> .content {
		pointer-events: none;
		opacity: 0;
		transform-origin: var(--transformOrigin);
		transform: scale(0.9);
	}
}

.modal-popup-enter-active, .modal-popup-leave-active {
	> .bg {
		transition: opacity 0.2s !important;
	}

	> .content {
		transform-origin: var(--transformOrigin);
		transition: opacity 0.2s cubic-bezier(0, 0, 0.2, 1), transform 0.2s cubic-bezier(0, 0, 0.2, 1) !important;
	}
}
.modal-popup-enter-from, .modal-popup-leave-to {
	> .bg {
		opacity: 0;
	}

	> .content {
		pointer-events: none;
		opacity: 0;
		transform-origin: var(--transformOrigin);
		transform: scale(0.9);
	}
}

.modal-drawer-enter-active {
	> .bg {
		transition: opacity 0.2s !important;
	}

	> .content {
		transition: transform 0.2s cubic-bezier(0,.5,0,1) !important;
	}
}
.modal-drawer-leave-active {
	> .bg {
		transition: opacity 0.2s !important;
	}

	> .content {
		transition: transform 0.2s cubic-bezier(0,.5,0,1) !important;
	}
}
.modal-drawer-enter-from, .modal-drawer-leave-to {
	> .bg {
		opacity: 0;
	}

	> .content {
		pointer-events: none;
		transform: translateY(100%);
	}
}

.qzhlnise {
	> .bg {
		&.transparent {
			background: transparent;
			-webkit-backdrop-filter: none;
			backdrop-filter: none;
		}
	}

	&.dialog {
		> .content {
			position: fixed;
			top: 0;
			bottom: 0;
			left: 0;
			right: 0;
			margin: auto;
			padding: 32px;
			// TODO: mask-imageはiOSだとやたら重い。なんとかしたい
			-webkit-mask-image: linear-gradient(0deg, rgba(0,0,0,0) 0%, rgba(0,0,0,1) 32px, rgba(0,0,0,1) calc(100% - 32px), rgba(0,0,0,0) 100%);
			mask-image: linear-gradient(0deg, rgba(0,0,0,0) 0%, rgba(0,0,0,1) 32px, rgba(0,0,0,1) calc(100% - 32px), rgba(0,0,0,0) 100%);
			overflow: auto;
			display: flex;

			@media (max-width: 500px) {
				padding: 16px;
				-webkit-mask-image: linear-gradient(0deg, rgba(0,0,0,0) 0%, rgba(0,0,0,1) 16px, rgba(0,0,0,1) calc(100% - 16px), rgba(0,0,0,0) 100%);
				mask-image: linear-gradient(0deg, rgba(0,0,0,0) 0%, rgba(0,0,0,1) 16px, rgba(0,0,0,1) calc(100% - 16px), rgba(0,0,0,0) 100%);
			}

			> ::v-deep(*) {
				margin: auto;
			}

			&.top {
				> ::v-deep(*) {
					margin-top: 0;
				}
			}
		}
	}

	&.popup {
		> .content {
			position: absolute;

			&.fixed {
				position: fixed;
			}
		}
	}

	&.drawer {
		position: fixed;
		top: 0;
		left: 0;
		width: 100%;
		height: 100%;
		overflow: clip;

		> .content {
			position: fixed;
			bottom: 0;
			left: 0;
			right: 0;
			margin: auto;

			> ::v-deep(*) {
				margin: auto;
			}
		}
	}

}
</style>
