import { t } from "@lingui/core/macro"
import { Trans } from "@lingui/react/macro"
import {
	type ColumnFiltersState,
	flexRender,
	getCoreRowModel,
	getFilteredRowModel,
	getSortedRowModel,
	type Row,
	type SortingState,
	type Table as TableType,
	useReactTable,
	type VisibilityState,
} from "@tanstack/react-table"
import { useVirtualizer, type VirtualItem } from "@tanstack/react-virtual"
import { listenKeys } from "nanostores"
import { memo, useEffect, useMemo, useRef, useState } from "react"
import { getProbeColumns } from "@/components/network-probes-table/network-probes-columns"
import { Card, CardHeader, CardTitle } from "@/components/ui/card"
import { Input } from "@/components/ui/input"
import { TableBody, TableCell, TableHead, TableHeader, TableRow } from "@/components/ui/table"
import { isReadOnlyUser, pb } from "@/lib/api"
import { $allSystemsById } from "@/lib/stores"
import { cn, getVisualStringWidth, useBrowserStorage } from "@/lib/utils"
import type { NetworkProbeRecord } from "@/types"
import { AddProbeDialog } from "./probe-dialog"

const NETWORK_PROBE_FIELDS = "id,name,system,target,protocol,port,interval,latency,loss,enabled,updated"

export default function NetworkProbesTableNew({ systemId }: { systemId?: string }) {
	const loadTime = Date.now()
	const [data, setData] = useState<NetworkProbeRecord[]>([])
	const [sorting, setSorting] = useBrowserStorage<SortingState>(
		`sort-np-${systemId ? 1 : 0}`,
		[{ id: systemId ? "name" : "system", desc: false }],
		sessionStorage
	)
	const [columnFilters, setColumnFilters] = useState<ColumnFiltersState>([])
	const [columnVisibility, setColumnVisibility] = useState<VisibilityState>({})
	const [globalFilter, setGlobalFilter] = useState("")

	// clear old data when systemId changes
	useEffect(() => {
		return setData([])
	}, [systemId])

	useEffect(() => {
		function fetchData(systemId?: string) {
			pb.collection<NetworkProbeRecord>("network_probes")
				.getList(0, 2000, {
					fields: NETWORK_PROBE_FIELDS,
					filter: systemId ? pb.filter("system={:system}", { system: systemId }) : undefined,
				})
				.then((res) => setData(res.items))
		}

		// initial load
		fetchData(systemId)

		// if no systemId, pull after every system update
		if (!systemId) {
			return $allSystemsById.listen((_value, _oldValue, systemId) => {
				// exclude initial load of systems
				if (Date.now() - loadTime > 500) {
					fetchData(systemId)
				}
			})
		}

		// if systemId, fetch after the system is updated
		return listenKeys($allSystemsById, [systemId], (_newSystems) => {
			fetchData(systemId)
		})
	}, [systemId])

	// Subscribe to updates
	useEffect(() => {
		let unsubscribe: (() => void) | undefined
		const pbOptions = systemId
			? { fields: NETWORK_PROBE_FIELDS, filter: pb.filter("system = {:system}", { system: systemId }) }
			: { fields: NETWORK_PROBE_FIELDS }

		;(async () => {
			try {
				unsubscribe = await pb.collection<NetworkProbeRecord>("network_probes").subscribe(
					"*",
					(event) => {
						const record = event.record
						setData((currentProbes) => {
							const probes = currentProbes ?? []
							const matchesSystemScope = !systemId || record.system === systemId

							if (event.action === "delete") {
								return probes.filter((device) => device.id !== record.id)
							}

							if (!matchesSystemScope) {
								// Record moved out of scope; ensure it disappears locally.
								return probes.filter((device) => device.id !== record.id)
							}

							const existingIndex = probes.findIndex((device) => device.id === record.id)
							if (existingIndex === -1) {
								return [record, ...probes]
							}

							const next = [...probes]
							next[existingIndex] = record
							return next
						})
					},
					pbOptions
				)
			} catch (error) {
				console.error("Failed to subscribe to SMART device updates:", error)
			}
		})()

		return () => {
			unsubscribe?.()
		}
	}, [systemId])

	const { longestName, longestTarget } = useMemo(() => {
		let longestName = 0
		let longestTarget = 0
		for (const p of data) {
			longestName = Math.max(longestName, getVisualStringWidth(p.name || p.target))
			longestTarget = Math.max(longestTarget, getVisualStringWidth(p.target))
		}
		return { longestName, longestTarget }
	}, [data])

	// Filter columns based on whether systemId is provided
	const columns = useMemo(() => {
		let columns = getProbeColumns(longestName, longestTarget)
		columns = systemId ? columns.filter((col) => col.id !== "system") : columns
		columns = isReadOnlyUser() ? columns.filter((col) => col.id !== "actions") : columns
		return columns
	}, [systemId, longestName, longestTarget])

	const table = useReactTable({
		data,
		columns,
		getCoreRowModel: getCoreRowModel(),
		getSortedRowModel: getSortedRowModel(),
		getFilteredRowModel: getFilteredRowModel(),
		onSortingChange: setSorting,
		onColumnFiltersChange: setColumnFilters,
		onColumnVisibilityChange: setColumnVisibility,
		defaultColumn: {
			sortUndefined: "last",
			size: 900,
			minSize: 0,
		},
		state: {
			sorting,
			columnFilters,
			columnVisibility,
			globalFilter,
		},
		onGlobalFilterChange: setGlobalFilter,
		globalFilterFn: (row, _columnId, filterValue) => {
			const probe = row.original
			const systemName = $allSystemsById.get()[probe.system]?.name ?? ""
			const searchString = `${probe.name}${probe.target}${probe.protocol}${systemName}`.toLocaleLowerCase()
			return (filterValue as string)
				.toLowerCase()
				.split(" ")
				.every((term) => searchString.includes(term))
		},
	})

	const rows = table.getRowModel().rows
	const visibleColumns = table.getVisibleLeafColumns()

	return (
		<Card className="@container w-full px-3 py-5 sm:py-6 sm:px-6">
			<CardHeader className="p-0 mb-3 sm:mb-4">
				<div className="grid md:flex gap-x-5 gap-y-3 w-full items-end">
					<div className="px-2 sm:px-1">
						<CardTitle className="mb-2">
							<Trans>Network Probes</Trans>
						</CardTitle>
						<div className="text-sm text-muted-foreground flex items-center flex-wrap">
							<Trans>ICMP/TCP/HTTP latency monitoring from this agent</Trans>
						</div>
					</div>
					<div className="md:ms-auto flex items-center gap-2">
						{data.length > 0 && (
							<Input
								placeholder={t`Filter...`}
								value={globalFilter}
								onChange={(e) => setGlobalFilter(e.target.value)}
								className="ms-auto px-4 w-full max-w-full md:w-64"
							/>
						)}
						{!isReadOnlyUser() ? <AddProbeDialog systemId={systemId} /> : null}
					</div>
				</div>
			</CardHeader>
			<div className="rounded-md">
				<NetworkProbesTable table={table} rows={rows} colLength={visibleColumns.length} />
			</div>
		</Card>
	)
}

const NetworkProbesTable = memo(function NetworkProbeTable({
	table,
	rows,
	colLength,
}: {
	table: TableType<NetworkProbeRecord>
	rows: Row<NetworkProbeRecord>[]
	colLength: number
}) {
	// The virtualizer will need a reference to the scrollable container element
	const scrollRef = useRef<HTMLDivElement>(null)

	const virtualizer = useVirtualizer<HTMLDivElement, HTMLTableRowElement>({
		count: rows.length,
		estimateSize: () => 54,
		getScrollElement: () => scrollRef.current,
		overscan: 5,
	})
	const virtualRows = virtualizer.getVirtualItems()

	const paddingTop = Math.max(0, virtualRows[0]?.start ?? 0 - virtualizer.options.scrollMargin)
	const paddingBottom = Math.max(0, virtualizer.getTotalSize() - (virtualRows[virtualRows.length - 1]?.end ?? 0))

	return (
		<div
			className={cn(
				"h-min max-h-[calc(100dvh-17rem)] max-w-full relative overflow-auto border rounded-md",
				// don't set min height if there are less than 2 rows, do set if we need to display the empty state
				(!rows.length || rows.length > 2) && "min-h-50"
			)}
			ref={scrollRef}
		>
			{/* add header height to table size */}
			<div style={{ height: `${virtualizer.getTotalSize() + 48}px`, paddingTop, paddingBottom }}>
				<table className="text-sm w-full h-full text-nowrap">
					<NetworkProbeTableHead table={table} />
					<TableBody>
						{rows.length ? (
							virtualRows.map((virtualRow) => {
								const row = rows[virtualRow.index]
								return <NetworkProbeTableRow key={row.id} row={row} virtualRow={virtualRow} />
							})
						) : (
							<TableRow>
								<TableCell colSpan={colLength} className="h-37 text-center pointer-events-none">
									<Trans>No results.</Trans>
								</TableCell>
							</TableRow>
						)}
					</TableBody>
				</table>
			</div>
		</div>
	)
})

function NetworkProbeTableHead({ table }: { table: TableType<NetworkProbeRecord> }) {
	return (
		<TableHeader className="sticky top-0 z-50 w-full border-b-2">
			{table.getHeaderGroups().map((headerGroup) => (
				<tr key={headerGroup.id}>
					{headerGroup.headers.map((header) => {
						return (
							<TableHead className="px-2" key={header.id}>
								{header.isPlaceholder ? null : flexRender(header.column.columnDef.header, header.getContext())}
							</TableHead>
						)
					})}
				</tr>
			))}
		</TableHeader>
	)
}

const NetworkProbeTableRow = memo(function NetworkProbeTableRow({
	row,
	virtualRow,
}: {
	row: Row<NetworkProbeRecord>
	virtualRow: VirtualItem
}) {
	return (
		<TableRow data-state={row.getIsSelected() && "selected"} className="transition-opacity">
			{row.getVisibleCells().map((cell) => (
				<TableCell
					key={cell.id}
					className="py-0"
					style={{
						width: `${cell.column.getSize()}px`,
						height: virtualRow.size,
					}}
				>
					{flexRender(cell.column.columnDef.cell, cell.getContext())}
				</TableCell>
			))}
		</TableRow>
	)
})