"use client"

import { dmSans125ClassName } from "@/lib/fonts"
import { cn } from "@lib/utils"
import { $fetch } from "@lib/api"
import { fetchSubscriptionStatus } from "@lib/queries"
import { GoogleDrive, Notion, OneDrive } from "@ui/assets/icons"
import { useCustomer } from "autumn-js/react"
import { useMutation, useQuery, useQueryClient } from "@tanstack/react-query"
import { Check, Plus, Trash2, Zap } from "lucide-react"
import { useEffect, useState } from "react"
import { toast } from "sonner"
import type { ConnectionResponseSchema } from "@repo/validation/api"
import type { z } from "zod"
import { analytics } from "@/lib/analytics"
import { ConnectAIModal } from "@/components/connect-ai-modal"
import { AddDocumentModal } from "@/components/new/add-document"
import { DEFAULT_PROJECT_ID } from "@repo/lib/constants"
import type { Project } from "@repo/lib/types"

type Connection = z.infer<typeof ConnectionResponseSchema>

const CONNECTORS = {
	"google-drive": {
		title: "Google Drive",
		description: "Connect your Google Docs, Sheets, and Slides",
		icon: GoogleDrive,
		documentLabel: "documents",
	},
	notion: {
		title: "Notion",
		description: "Import your Notion pages and databases",
		icon: Notion,
		documentLabel: "pages",
	},
	onedrive: {
		title: "OneDrive",
		description: "Access your Microsoft Office documents",
		icon: OneDrive,
		documentLabel: "documents",
	},
} as const

type ConnectorProvider = keyof typeof CONNECTORS

function SectionTitle({
	children,
	badge,
}: {
	children: React.ReactNode
	badge?: React.ReactNode
}) {
	return (
		<div className="flex items-center justify-between px-2">
			<p
				className={cn(
					dmSans125ClassName(),
					"font-semibold text-[20px] tracking-[-0.2px] text-[#FAFAFA]",
				)}
			>
				{children}
			</p>
			{badge}
		</div>
	)
}

function ProBadge() {
	return (
		<span className="bg-[#4BA0FA] text-[#00171A] text-[12px] font-bold tracking-[0.36px] px-1 py-0.5 rounded-[3px]">
			PRO
		</span>
	)
}

function ConnectionsCard({
	children,
	className,
}: {
	children: React.ReactNode
	className?: string
}) {
	return (
		<div
			className={cn(
				"relative bg-[#14161A] rounded-[14px] p-6 w-full overflow-hidden",
				"shadow-[inset_2.42px_2.42px_4.263px_rgba(11,15,21,0.7)]",
				className,
			)}
		>
			{children}
		</div>
	)
}

function PillButton({
	children,
	onClick,
	disabled,
	className,
}: {
	children: React.ReactNode
	onClick?: () => void
	disabled?: boolean
	className?: string
}) {
	return (
		<button
			type="button"
			onClick={onClick}
			disabled={disabled}
			className={cn(
				"relative flex items-center justify-center gap-2",
				"bg-[#0D121A]",
				"rounded-full h-11 px-4 w-full",
				"cursor-pointer transition-opacity hover:opacity-80",
				"shadow-[inset_1.5px_1.5px_4.5px_rgba(0,0,0,0.7)]",
				"disabled:opacity-50 disabled:cursor-not-allowed",
				dmSans125ClassName(),
				className,
			)}
		>
			{children}
		</button>
	)
}

function ConnectionStatusBadge({ connected }: { connected: boolean }) {
	return (
		<div className="flex items-center gap-2">
			<div
				className={cn(
					"size-[7px] rounded-full",
					connected ? "bg-[#00AC3F]" : "bg-[#737373]",
				)}
			/>
			<span
				className={cn(
					dmSans125ClassName(),
					"font-medium text-[16px] tracking-[-0.16px]",
					connected ? "text-[#00AC3F]" : "text-[#737373]",
				)}
			>
				{connected ? "Connected" : "Disconnected"}
			</span>
		</div>
	)
}

function ConnectionRow({
	connection,
	onDelete,
	isDeleting,
	disabled,
	projects,
}: {
	connection: Connection
	onDelete: () => void
	isDeleting: boolean
	disabled?: boolean
	projects: Project[]
}) {
	const config = CONNECTORS[connection.provider as ConnectorProvider]
	if (!config) return null

	const Icon = config.icon
	// Check if connection is active: if expiresAt exists and is in the future, or if no expiresAt
	const isConnected =
		!connection.expiresAt || new Date(connection.expiresAt) > new Date()

	// Format relative time
	const formatRelativeTime = (date: string | null | undefined) => {
		if (!date) return "Never"
		const d = new Date(date)
		const now = new Date()
		const diffMs = now.getTime() - d.getTime()
		const diffHours = Math.floor(diffMs / (1000 * 60 * 60))
		const diffDays = Math.floor(diffHours / 24)

		if (diffHours < 1) return "Just now"
		if (diffHours < 24) return `${diffHours}h ago`
		if (diffDays === 1) return "Yesterday"
		if (diffDays < 7) return `${diffDays} days ago`
		return d.toLocaleDateString()
	}

	const getProjectDisplayName = (containerTag: string): string => {
		if (containerTag === DEFAULT_PROJECT_ID) return "Default Project"
		const found = projects.find((p) => p.containerTag === containerTag)
		if (found) return found.name
		return containerTag.replace(/^sm_project_/, "") // if cached project is not found, remove the prefix
	}

	const documentCount = (connection.metadata?.documentCount as number) ?? 0
	const containerTags = (
		connection as Connection & { containerTags?: string[] }
	).containerTags
	const projectName =
		containerTags && containerTags.length > 0 && containerTags[0]
			? getProjectDisplayName(containerTags[0])
			: null

	return (
		<div
			className={cn(
				"bg-[#14161A] border border-[rgba(82,89,102,0.2)] rounded-[12px] px-4 py-3",
				"shadow-[0px_1px_2px_0px_rgba(0,43,87,0.1)]",
			)}
		>
			<div className="flex flex-col gap-4">
				{/* Main row */}
				<div className="flex items-center gap-4">
					<Icon className="size-6 shrink-0" />
					<div className="flex-1 flex flex-col gap-1.5">
						<div className="flex items-center gap-4">
							<span
								className={cn(
									dmSans125ClassName(),
									"font-medium text-[16px] tracking-[-0.16px] text-[#FAFAFA]",
								)}
							>
								{config.title}
							</span>
							<ConnectionStatusBadge connected={isConnected} />
						</div>
						<span
							className={cn(
								dmSans125ClassName(),
								"font-medium text-[16px] tracking-[-0.16px] text-[#737373]",
							)}
						>
							{connection.email || "Unknown"}
						</span>
					</div>
					<button
						type="button"
						onClick={onDelete}
						disabled={isDeleting || disabled}
						className="text-[#737373] hover:text-red-400 transition-colors disabled:opacity-50 disabled:cursor-not-allowed"
						aria-label="Delete connection"
					>
						<Trash2 className="size-[22px]" />
					</button>
				</div>

				{/* Meta row */}
				<div className="flex items-center gap-2 flex-wrap">
					{projectName && (
						<>
							<span
								className={cn(
									dmSans125ClassName(),
									"font-medium text-[14px] tracking-[-0.14px] text-[#737373]",
								)}
							>
								Project: {projectName}
							</span>
							<div className="size-[3px] rounded-full bg-[#737373]" />
						</>
					)}
					<span
						className={cn(
							dmSans125ClassName(),
							"font-medium text-[14px] tracking-[-0.14px] text-[#737373]",
						)}
					>
						Added: {formatRelativeTime(connection.createdAt)}
					</span>
					<div className="size-[3px] rounded-full bg-[#737373]" />
					<span
						className={cn(
							dmSans125ClassName(),
							"font-medium text-[14px] tracking-[-0.14px] text-[#737373]",
						)}
					>
						{documentCount} {config.documentLabel} connected
					</span>
				</div>
			</div>
		</div>
	)
}

function UpgradeOverlay({ onUpgrade }: { onUpgrade: () => void }) {
	return (
		<div className="absolute inset-0 flex items-center justify-center z-10">
			<div className="flex flex-col items-center gap-4">
				<div className="flex flex-col items-center gap-2">
					<Zap className="size-6 text-[#737373]" />
					<p
						className={cn(
							dmSans125ClassName(),
							"font-medium text-[14px] tracking-[-0.14px] text-[#737373] text-center max-w-[184px]",
						)}
					>
						<button
							type="button"
							onClick={onUpgrade}
							className="underline hover:text-white transition-colors cursor-pointer"
						>
							Upgrade to Pro
						</button>{" "}
						to get Supermemory Connections
					</p>
				</div>
				<div className="flex flex-col gap-2">
					<FeatureItem text="Unlimited memories" />
					<FeatureItem text="10 connections" />
					<FeatureItem text="Advanced search" />
					<FeatureItem text="Priority support" />
				</div>
			</div>
		</div>
	)
}

function FeatureItem({ text }: { text: string }) {
	return (
		<div className="flex items-center gap-2">
			<Check className="size-4 shrink-0 text-[#4BA0FA]" />
			<span
				className={cn(
					dmSans125ClassName(),
					"text-[14px] tracking-[-0.14px] text-white",
				)}
			>
				{text}
			</span>
		</div>
	)
}

export default function ConnectionsMCP() {
	const queryClient = useQueryClient()
	const autumn = useCustomer()
	const [isAddDocumentOpen, setIsAddDocumentOpen] = useState(false)
	const [mcpModalOpen, setMcpModalOpen] = useState(false)

	const projects = (queryClient.getQueryData<Project[]>(["projects"]) ||
		[]) as Project[]

	// Billing data
	const {
		data: status = {
			consumer_pro: { allowed: false, status: null },
		},
		isLoading: isCheckingStatus,
	} = fetchSubscriptionStatus(autumn, !autumn.isLoading)

	const hasProProduct = status.consumer_pro?.status !== null

	// Get connections data directly from autumn customer
	const connectionsFeature = autumn.customer?.features?.connections
	const connectionsUsed = connectionsFeature?.usage ?? 0
	const connectionsLimit = connectionsFeature?.included_usage ?? 10

	const canAddConnection = connectionsUsed < connectionsLimit

	// Fetch connections
	const {
		data: connections = [],
		isLoading: isLoadingConnections,
		error: connectionsError,
	} = useQuery({
		queryKey: ["connections"],
		queryFn: async () => {
			const response = await $fetch("@post/connections/list", {
				body: {
					containerTags: [],
				},
			})

			if (response.error) {
				throw new Error(response.error?.message || "Failed to load connections")
			}

			return response.data as Connection[]
		},
		staleTime: 30 * 1000,
		refetchInterval: 60 * 1000,
		enabled: hasProProduct,
	})

	useEffect(() => {
		if (connectionsError) {
			toast.error("Failed to load connections", {
				description:
					connectionsError instanceof Error
						? connectionsError.message
						: "Unknown error",
			})
		}
	}, [connectionsError])

	// Delete connection mutation
	const deleteConnectionMutation = useMutation({
		mutationFn: async (connectionId: string) => {
			await $fetch(`@delete/connections/${connectionId}`)
		},
		onSuccess: () => {
			analytics.connectionDeleted()
			toast.success(
				"Connection removal has started. Supermemory will permanently delete the documents in the next few minutes.",
			)
			queryClient.invalidateQueries({ queryKey: ["connections"] })
		},
		onError: (error) => {
			toast.error("Failed to remove connection", {
				description: error instanceof Error ? error.message : "Unknown error",
			})
		},
	})

	// Upgrade handler
	const handleUpgrade = async () => {
		try {
			await autumn.attach({
				productId: "consumer_pro",
				successUrl: "https://app.supermemory.ai/new/settings#connections",
			})
			window.location.reload()
		} catch (error) {
			console.error(error)
		}
	}

	const isLoading = autumn.isLoading || isCheckingStatus

	return (
		<div className="flex flex-col gap-8 pt-4 w-full">
			{/* Supermemory Connections Section */}
			<div className="flex flex-col gap-4">
				<SectionTitle badge={<ProBadge />}>
					Supermemory Connections
				</SectionTitle>

				<ConnectionsCard className="relative">
					{/* Blur overlay for free users */}
					{!hasProProduct && !isLoading && (
						<>
							<div className="absolute inset-0 bg-[#14161A]/80 backdrop-blur-sm z-5" />
							<UpgradeOverlay onUpgrade={handleUpgrade} />
						</>
					)}

					<div
						className={cn(
							"flex flex-col gap-4",
							!hasProProduct && !isLoading && "opacity-30 pointer-events-none",
						)}
					>
						<div className="flex items-center justify-between">
							<span
								className={cn(
									dmSans125ClassName(),
									"font-semibold text-[16px] tracking-[-0.16px] text-[#FAFAFA]",
								)}
							>
								Connected to Supermemory
							</span>
							<span
								className={cn(
									dmSans125ClassName(),
									"font-semibold text-[16px] tracking-[-0.16px] text-[#737373]",
								)}
							>
								{connections.length}/{connectionsLimit} connections used
							</span>
						</div>

						<div className="flex flex-col gap-4">
							{isLoadingConnections ? (
								<div className="flex items-center justify-center py-8">
									<div className="size-6 border-2 border-[#737373] border-t-transparent rounded-full animate-spin" />
								</div>
							) : connections.length > 0 ? (
								connections.map((connection) => (
									<ConnectionRow
										key={connection.id}
										connection={connection}
										onDelete={() =>
											deleteConnectionMutation.mutate(connection.id)
										}
										isDeleting={deleteConnectionMutation.isPending}
										disabled={!hasProProduct}
										projects={projects}
									/>
								))
							) : (
								<div className="flex flex-col items-center justify-center py-8 text-center">
									<Zap className="size-6 text-[#737373] mb-2" />
									<p
										className={cn(
											dmSans125ClassName(),
											"font-medium text-[14px] text-[#737373]",
										)}
									>
										No connections yet
									</p>
									<p
										className={cn(
											dmSans125ClassName(),
											"font-medium text-[12px] text-[#737373]",
										)}
									>
										Connect a service below to import your knowledge
									</p>
								</div>
							)}
						</div>

						<PillButton
							onClick={() => setIsAddDocumentOpen(true)}
							disabled={!hasProProduct || !canAddConnection}
						>
							<Plus className="size-[10px] text-[#FAFAFA]" />
							<span className="text-[14px] tracking-[-0.14px] text-[#FAFAFA] font-medium">
								Connect knowledge bases
							</span>
						</PillButton>
					</div>
				</ConnectionsCard>
			</div>

			{/* Supermemory MCP Section */}
			<div className="flex flex-col gap-4">
				<SectionTitle>Supermemory MCP</SectionTitle>

				<ConnectionsCard>
					<div className="flex flex-col gap-4">
						<p
							className={cn(
								dmSans125ClassName(),
								"font-medium text-[16px] tracking-[-0.16px] text-[#FAFAFA]",
							)}
						>
							Connect your AI to create and use your memories via MCP.{" "}
							<a
								href="https://docs.supermemory.ai/supermemory-mcp/introduction"
								target="_blank"
								rel="noopener noreferrer"
								className="underline hover:text-[#4BA0FA] transition-colors"
							>
								Learn more
							</a>
						</p>

						<ConnectAIModal open={mcpModalOpen} onOpenChange={setMcpModalOpen}>
							<PillButton onClick={() => setMcpModalOpen(true)}>
								<Plus className="size-[10px] text-[#FAFAFA]" />
								<span className="text-[14px] tracking-[-0.14px] text-[#FAFAFA] font-medium">
									Connect your AI to Supermemory
								</span>
							</PillButton>
						</ConnectAIModal>
					</div>
				</ConnectionsCard>
			</div>

			{/* Add Document Modal */}
			<AddDocumentModal
				isOpen={isAddDocumentOpen}
				onClose={() => setIsAddDocumentOpen(false)}
				defaultTab="connect"
			/>
		</div>
	)
}