<template>
	<li
		role="button"
		data-pyro-file
		:class="[
			containerClasses,
			isDragOver && type === 'directory' ? 'bg-brand-highlight' : '',
			isDragging ? 'opacity-50' : '',
		]"
		tabindex="0"
		draggable="true"
		@click="selectItem"
		@contextmenu="openContextMenu"
		@keydown="(e) => e.key === 'Enter' && selectItem()"
		@dragstart="handleDragStart"
		@dragend="handleDragEnd"
		@dragenter.prevent="handleDragEnter"
		@dragover.prevent="handleDragOver"
		@dragleave.prevent="handleDragLeave"
		@drop.prevent="handleDrop"
	>
		<div
			data-pyro-file-metadata
			class="pointer-events-none flex w-full items-center gap-4 truncate"
		>
			<div
				class="pointer-events-none flex size-8 items-center justify-center rounded-full bg-bg-raised p-[6px] group-hover:bg-brand-highlight group-hover:text-brand group-focus:bg-brand-highlight group-focus:text-brand"
				:class="isEditableFile ? 'group-active:scale-[0.8]' : ''"
			>
				<component :is="iconComponent" class="size-6" />
			</div>
			<div class="pointer-events-none flex w-full flex-col truncate">
				<span
					class="pointer-events-none w-[98%] truncate font-bold group-hover:text-contrast group-focus:text-contrast"
				>
					{{ name }}
				</span>
				<span class="pointer-events-none text-xs text-secondary group-hover:text-primary">
					{{ subText }}
				</span>
			</div>
		</div>
		<div
			data-pyro-file-actions
			class="pointer-events-auto flex w-fit flex-shrink-0 items-center gap-4 md:gap-12"
		>
			<span class="hidden w-[160px] text-nowrap font-mono text-sm text-secondary md:flex">
				{{ formattedCreationDate }}
			</span>
			<span class="w-[160px] text-nowrap font-mono text-sm text-secondary">
				{{ formattedModifiedDate }}
			</span>
			<ButtonStyled circular type="transparent">
				<TeleportOverflowMenu :options="menuOptions" direction="left" position="bottom">
					<MoreHorizontalIcon class="h-5 w-5 bg-transparent" />
					<template #extract><PackageOpenIcon /> Extract</template>
					<template #rename><EditIcon /> Rename</template>
					<template #move><RightArrowIcon /> Move</template>
					<template #download><DownloadIcon /> Download</template>
					<template #delete><TrashIcon /> Delete</template>
				</TeleportOverflowMenu>
			</ButtonStyled>
		</div>
	</li>
</template>

<script setup lang="ts">
import {
	DownloadIcon,
	EditIcon,
	FileArchiveIcon,
	FileIcon,
	FolderOpenIcon,
	MoreHorizontalIcon,
	PackageOpenIcon,
	RightArrowIcon,
	TrashIcon,
} from '@modrinth/assets'
import { ButtonStyled } from '@modrinth/ui'
import { computed, ref, shallowRef } from 'vue'
import { renderToString } from 'vue/server-renderer'
import { useRoute, useRouter } from 'vue-router'

import {
	UiServersIconsCodeFileIcon,
	UiServersIconsCogFolderIcon,
	UiServersIconsEarthIcon,
	UiServersIconsImageFileIcon,
	UiServersIconsTextFileIcon,
} from '#components'
import PaletteIcon from '~/assets/icons/palette.svg?component'

import TeleportOverflowMenu from './TeleportOverflowMenu.vue'

interface FileItemProps {
	name: string
	type: 'directory' | 'file'
	size?: number
	count?: number
	modified: number
	created: number
	path: string
}

const props = defineProps<FileItemProps>()

const emit = defineEmits<{
	(
		e: 'rename' | 'move' | 'download' | 'delete' | 'edit' | 'extract',
		item: { name: string; type: string; path: string },
	): void
	(e: 'moveDirectTo', item: { name: string; type: string; path: string; destination: string }): void
	(e: 'contextmenu', x: number, y: number): void
}>()

const isDragOver = ref(false)
const isDragging = ref(false)

const codeExtensions = Object.freeze([
	'json',
	'json5',
	'jsonc',
	'java',
	'kt',
	'kts',
	'sh',
	'bat',
	'ps1',
	'yml',
	'yaml',
	'toml',
	'js',
	'ts',
	'py',
	'rb',
	'php',
	'html',
	'css',
	'cpp',
	'c',
	'h',
	'rs',
	'go',
])

const textExtensions = Object.freeze(['txt', 'md', 'log', 'cfg', 'conf', 'properties', 'ini', 'sk'])
const imageExtensions = Object.freeze(['png', 'jpg', 'jpeg', 'gif', 'svg', 'webp'])
const supportedArchiveExtensions = Object.freeze(['zip'])
const units = Object.freeze(['B', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB'])

const route = shallowRef(useRoute())
const router = useRouter()

const containerClasses = computed(() => [
	'group m-0 p-0 focus:!outline-none flex w-full select-none items-center justify-between overflow-hidden border-0 border-b border-solid border-bg-raised p-3 last:border-none hover:bg-bg-raised focus:bg-bg-raised',
	isEditableFile.value ? 'cursor-pointer' : props.type === 'directory' ? 'cursor-pointer' : '',
	isDragOver.value ? 'bg-brand-highlight' : '',
])

const fileExtension = computed(() => props.name.split('.').pop()?.toLowerCase() || '')

const isZip = computed(() => fileExtension.value === 'zip')

const menuOptions = computed(() => [
	{
		id: 'extract',
		shown: isZip.value,
		action: () => emit('extract', { name: props.name, type: props.type, path: props.path }),
	},
	{
		divider: true,
		shown: isZip.value,
	},
	{
		id: 'rename',
		action: () => emit('rename', { name: props.name, type: props.type, path: props.path }),
	},
	{
		id: 'move',
		action: () => emit('move', { name: props.name, type: props.type, path: props.path }),
	},
	{
		id: 'download',
		action: () => emit('download', { name: props.name, type: props.type, path: props.path }),
		shown: props.type !== 'directory',
	},
	{
		id: 'delete',
		action: () => emit('delete', { name: props.name, type: props.type, path: props.path }),
		color: 'red' as const,
	},
])

const iconComponent = computed(() => {
	if (props.type === 'directory') {
		if (props.name === 'config') return UiServersIconsCogFolderIcon
		if (props.name === 'world') return UiServersIconsEarthIcon
		if (props.name === 'resourcepacks') return PaletteIcon
		return FolderOpenIcon
	}

	const ext = fileExtension.value
	if (codeExtensions.includes(ext)) return UiServersIconsCodeFileIcon
	if (textExtensions.includes(ext)) return UiServersIconsTextFileIcon
	if (imageExtensions.includes(ext)) return UiServersIconsImageFileIcon
	if (supportedArchiveExtensions.includes(ext)) return FileArchiveIcon
	return FileIcon
})

const subText = computed(() => {
	if (props.type === 'directory') {
		return `${props.count} ${props.count === 1 ? 'item' : 'items'}`
	}
	return formattedSize.value
})

const formattedModifiedDate = computed(() => {
	const date = new Date(props.modified * 1000)
	return `${date.toLocaleDateString('en-US', {
		month: '2-digit',
		day: '2-digit',
		year: '2-digit',
	})}, ${date.toLocaleTimeString('en-US', {
		hour: 'numeric',
		minute: 'numeric',
		hour12: true,
	})}`
})

const formattedCreationDate = computed(() => {
	const date = new Date(props.created * 1000)
	return `${date.toLocaleDateString('en-US', {
		month: '2-digit',
		day: '2-digit',
		year: '2-digit',
	})}, ${date.toLocaleTimeString('en-US', {
		hour: 'numeric',
		minute: 'numeric',
		hour12: true,
	})}`
})

const isEditableFile = computed(() => {
	if (props.type === 'file') {
		const ext = fileExtension.value
		return (
			!props.name.includes('.') ||
			textExtensions.includes(ext) ||
			codeExtensions.includes(ext) ||
			imageExtensions.includes(ext)
		)
	}
	return false
})

const formattedSize = computed(() => {
	if (props.size === undefined) return ''
	const bytes = props.size
	if (bytes === 0) return '0 B'

	const exponent = Math.min(Math.floor(Math.log(bytes) / Math.log(1024)), units.length - 1)
	const size = (bytes / Math.pow(1024, exponent)).toFixed(2)
	return `${size} ${units[exponent]}`
})

const openContextMenu = (event: MouseEvent) => {
	event.preventDefault()
	emit('contextmenu', event.clientX, event.clientY)
}

const navigateToFolder = () => {
	const currentPath = route.value.query.path?.toString() || ''
	const newPath = currentPath.endsWith('/')
		? `${currentPath}${props.name}`
		: `${currentPath}/${props.name}`
	router.push({ query: { path: newPath, page: 1 } })
}

const isNavigating = ref(false)

const selectItem = () => {
	if (isNavigating.value) return
	isNavigating.value = true

	if (props.type === 'directory') {
		navigateToFolder()
	} else if (props.type === 'file' && isEditableFile.value) {
		emit('edit', { name: props.name, type: props.type, path: props.path })
	}

	setTimeout(() => {
		isNavigating.value = false
	}, 500)
}

const getDragIcon = async () => {
	let iconToUse

	if (props.type === 'directory') {
		if (props.name === 'config') {
			iconToUse = UiServersIconsCogFolderIcon
		} else if (props.name === 'world') {
			iconToUse = UiServersIconsEarthIcon
		} else if (props.name === 'resourcepacks') {
			iconToUse = PaletteIcon
		} else {
			iconToUse = FolderOpenIcon
		}
	} else {
		const ext = fileExtension.value
		if (codeExtensions.includes(ext)) {
			iconToUse = UiServersIconsCodeFileIcon
		} else if (textExtensions.includes(ext)) {
			iconToUse = UiServersIconsTextFileIcon
		} else if (imageExtensions.includes(ext)) {
			iconToUse = UiServersIconsImageFileIcon
		} else {
			iconToUse = FileIcon
		}
	}

	return await renderToString(h(iconToUse))
}

const handleDragStart = async (event: DragEvent) => {
	if (!event.dataTransfer) return
	isDragging.value = true

	const dragGhost = document.createElement('div')
	dragGhost.className =
		'fixed left-0 top-0 flex items-center max-w-[500px] flex-row gap-3 rounded-lg bg-bg-raised p-3 shadow-lg pointer-events-none'

	const iconContainer = document.createElement('div')
	iconContainer.className = 'flex size-6 items-center justify-center'

	const icon = document.createElement('div')
	icon.className = 'size-4'
	icon.innerHTML = await getDragIcon()
	iconContainer.appendChild(icon)

	const nameSpan = document.createElement('span')
	nameSpan.className = 'font-bold truncate text-contrast'
	nameSpan.textContent = props.name

	dragGhost.appendChild(iconContainer)
	dragGhost.appendChild(nameSpan)
	document.body.appendChild(dragGhost)

	event.dataTransfer.setDragImage(dragGhost, 0, 0)

	requestAnimationFrame(() => {
		document.body.removeChild(dragGhost)
	})

	event.dataTransfer.setData(
		'application/pyro-file-move',
		JSON.stringify({
			name: props.name,
			type: props.type,
			path: props.path,
		}),
	)
	event.dataTransfer.effectAllowed = 'move'
}

const isChildPath = (parentPath: string, childPath: string) => {
	return childPath.startsWith(parentPath + '/')
}

const handleDragEnd = () => {
	isDragging.value = false
}

const handleDragEnter = () => {
	if (props.type !== 'directory') return
	isDragOver.value = true
}

const handleDragOver = (event: DragEvent) => {
	if (props.type !== 'directory' || !event.dataTransfer) return
	event.dataTransfer.dropEffect = 'move'
}

const handleDragLeave = () => {
	isDragOver.value = false
}

const handleDrop = (event: DragEvent) => {
	isDragOver.value = false
	if (props.type !== 'directory' || !event.dataTransfer) return

	try {
		const dragData = JSON.parse(event.dataTransfer.getData('application/pyro-file-move'))

		if (dragData.path === props.path) return

		if (dragData.type === 'directory' && isChildPath(dragData.path, props.path)) {
			console.error('Cannot move a folder into its own subfolder')
			return
		}

		emit('moveDirectTo', {
			name: dragData.name,
			type: dragData.type,
			path: dragData.path,
			destination: props.path,
		})
	} catch (error) {
		console.error('Error handling file drop:', error)
	}
}
</script>
