"use client";

import { makeAssistantToolUI } from "@assistant-ui/react";
import { CornerDownLeftIcon, TriangleAlertIcon } from "lucide-react";
import { useCallback, useEffect, useState } from "react";
import { Button } from "@/components/ui/button";
import { Spinner } from "@/components/ui/spinner";

interface InterruptResult {
	__interrupt__: true;
	__decided__?: "approve" | "reject";
	action_requests: Array<{
		name: string;
		args: Record<string, unknown>;
		description?: string;
	}>;
	review_configs: Array<{
		action_name: string;
		allowed_decisions: Array<"approve" | "reject">;
	}>;
	interrupt_type?: string;
	message?: string;
	context?: {
		account?: {
			id: number;
			name: string;
			workspace_id: string | null;
			workspace_name: string;
			workspace_icon: string;
		};
		page_id?: string;
		current_title?: string;
		document_id?: number;
		indexed_at?: string;
		error?: string;
	};
}

interface SuccessResult {
	status: "success";
	page_id: string;
	title?: string;
	message?: string;
	deleted_from_kb?: boolean;
}

interface ErrorResult {
	status: "error";
	message: string;
}

interface InfoResult {
	status: "not_found";
	message: string;
}

interface WarningResult {
	status: "success";
	warning: string;
	page_id?: string;
	title?: string;
	message?: string;
}

interface AuthErrorResult {
	status: "auth_error";
	message: string;
	connector_id?: number;
	connector_type: string;
}

type DeleteNotionPageResult =
	| InterruptResult
	| SuccessResult
	| ErrorResult
	| InfoResult
	| WarningResult
	| AuthErrorResult;

function isInterruptResult(result: unknown): result is InterruptResult {
	return (
		typeof result === "object" &&
		result !== null &&
		"__interrupt__" in result &&
		(result as InterruptResult).__interrupt__ === true
	);
}

function isErrorResult(result: unknown): result is ErrorResult {
	return (
		typeof result === "object" &&
		result !== null &&
		"status" in result &&
		(result as ErrorResult).status === "error"
	);
}

function isInfoResult(result: unknown): result is InfoResult {
	return (
		typeof result === "object" &&
		result !== null &&
		"status" in result &&
		(result as InfoResult).status === "not_found"
	);
}

function isAuthErrorResult(result: unknown): result is AuthErrorResult {
	return (
		typeof result === "object" &&
		result !== null &&
		"status" in result &&
		(result as AuthErrorResult).status === "auth_error"
	);
}

function isWarningResult(result: unknown): result is WarningResult {
	return (
		typeof result === "object" &&
		result !== null &&
		"status" in result &&
		(result as WarningResult).status === "success" &&
		"warning" in result &&
		typeof (result as WarningResult).warning === "string"
	);
}

function ApprovalCard({
	interruptData,
	onDecision,
}: {
	interruptData: InterruptResult;
	onDecision: (decision: {
		type: "approve" | "reject";
		message?: string;
		edited_action?: { name: string; args: Record<string, unknown> };
	}) => void;
}) {
	const [decided, setDecided] = useState<"approve" | "reject" | null>(
		interruptData.__decided__ ?? null
	);
	const [deleteFromKb, setDeleteFromKb] = useState(false);

	const account = interruptData.context?.account;
	const currentTitle = interruptData.context?.current_title;

	const handleApprove = useCallback(() => {
		if (decided) return;
		setDecided("approve");
		onDecision({
			type: "approve",
			edited_action: {
				name: interruptData.action_requests[0].name,
				args: {
					page_id: interruptData.context?.page_id,
					connector_id: account?.id,
					delete_from_kb: deleteFromKb,
				},
			},
		});
	}, [decided, onDecision, interruptData, account?.id, deleteFromKb]);

	useEffect(() => {
		const handler = (e: KeyboardEvent) => {
			if (e.key === "Enter" && !e.shiftKey && !e.ctrlKey && !e.metaKey) {
				handleApprove();
			}
		};
		window.addEventListener("keydown", handler);
		return () => window.removeEventListener("keydown", handler);
	}, [handleApprove]);

	return (
		<div className="my-4 max-w-lg overflow-hidden rounded-2xl border bg-muted/30 transition-all duration-300">
			{/* Header */}
			<div className="flex items-start justify-between px-5 pt-5 pb-4 select-none">
				<div>
					<p className="text-sm font-semibold text-foreground">
						{decided === "reject"
							? "Notion Page Deletion Rejected"
							: decided === "approve"
								? "Notion Page Deletion Approved"
								: "Delete Notion Page"}
					</p>
					<p className="text-xs text-muted-foreground mt-0.5">
						{decided === "reject"
							? "Page deletion was cancelled"
							: decided === "approve"
								? "Page deletion is in progress"
								: "Requires your approval to proceed"}
					</p>
				</div>
			</div>

			{/* Context section — read-only account and page info */}
			{!decided && interruptData.context && (
				<>
					<div className="mx-5 h-px bg-border/50" />
					<div className="px-5 py-4 space-y-4 select-none">
						{interruptData.context.error ? (
							<p className="text-sm text-destructive">{interruptData.context.error}</p>
						) : (
							<>
								{account && (
									<div className="space-y-2">
										<p className="text-xs font-medium text-muted-foreground">Notion Account</p>
										<div className="w-full rounded-md border border-input bg-muted/50 px-3 py-2 text-sm">
											{account.workspace_icon} {account.workspace_name}
										</div>
									</div>
								)}

								{currentTitle && (
									<div className="space-y-2">
										<p className="text-xs font-medium text-muted-foreground">Page to Delete</p>
										<div className="w-full rounded-md border border-input bg-muted/50 px-3 py-2 text-sm">
											📄 {currentTitle}
										</div>
									</div>
								)}
							</>
						)}
					</div>
				</>
			)}

			{/* delete_from_kb toggle */}
			{!decided && (
				<>
					<div className="mx-5 h-px bg-border/50" />
					<div className="px-5 py-4 select-none">
						<label className="flex items-start gap-2 cursor-pointer">
							<input
								type="checkbox"
								checked={deleteFromKb}
								onChange={(e) => setDeleteFromKb(e.target.checked)}
								className="mt-0.5"
							/>
							<div className="flex-1">
								<span className="text-sm text-foreground">Also remove from knowledge base</span>
								<p className="text-xs text-muted-foreground mt-1">
									This will permanently delete the page from your knowledge base (cannot be undone)
								</p>
							</div>
						</label>
					</div>
				</>
			)}

			{/* Action buttons - only shown when pending */}
			{!decided && (
				<>
					<div className="mx-5 h-px bg-border/50" />
				<div className="px-5 py-4 flex items-center gap-2 select-none">
					<Button
						size="sm"
						className="rounded-lg gap-1.5"
						onClick={handleApprove}
					>
						Approve
						<CornerDownLeftIcon className="size-3 opacity-60" />
					</Button>
					<Button
						size="sm"
						variant="ghost"
						className="rounded-lg text-muted-foreground"
						onClick={() => {
							setDecided("reject");
							onDecision({ type: "reject", message: "User rejected the action." });
						}}
					>
						Reject
					</Button>
				</div>
				</>
			)}
		</div>
	);
}

function AuthErrorCard({ result }: { result: AuthErrorResult }) {
	return (
		<div className="my-4 max-w-lg overflow-hidden rounded-2xl border bg-muted/30">
			<div className="px-5 pt-5 pb-4">
				<p className="text-sm font-semibold text-destructive">
					Notion authentication expired
				</p>
			</div>
			<div className="mx-5 h-px bg-border/50" />
			<div className="px-5 py-4">
				<p className="text-sm text-muted-foreground">{result.message}</p>
			</div>
		</div>
	);
}

function ErrorCard({ result }: { result: ErrorResult }) {
	return (
		<div className="my-4 max-w-lg overflow-hidden rounded-2xl border bg-muted/30">
			<div className="px-5 pt-5 pb-4">
				<p className="text-sm font-semibold text-destructive">Failed to delete Notion page</p>
			</div>
			<div className="mx-5 h-px bg-border/50" />
			<div className="px-5 py-4">
				<p className="text-sm text-muted-foreground">{result.message}</p>
			</div>
		</div>
	);
}

function InfoCard({ result }: { result: InfoResult }) {
	return (
		<div className="my-4 max-w-lg overflow-hidden rounded-2xl border bg-muted/30">
			<div className="px-5 pt-5 pb-4">
				<p className="text-sm font-semibold text-amber-600 dark:text-amber-400">
					Page not found
				</p>
			</div>
			<div className="mx-5 h-px bg-border/50" />
			<div className="px-5 py-4">
				<p className="text-sm text-muted-foreground">{result.message}</p>
			</div>
		</div>
	);
}

function WarningCard({ result }: { result: WarningResult }) {
	return (
		<div className="my-4 max-w-lg overflow-hidden rounded-2xl border bg-muted/30">
			<div className="flex items-start gap-3 border-b px-5 py-4">
				<TriangleAlertIcon className="size-4 mt-0.5 shrink-0 text-amber-500" />
				<p className="text-sm font-medium text-amber-600 dark:text-amber-500">Partial success</p>
			</div>
			<div className="px-5 py-4 space-y-2 text-xs">
				<p className="text-sm text-muted-foreground">{result.warning}</p>
				{result.title && (
					<div className="pt-2">
						<span className="font-medium text-muted-foreground">Deleted page: </span>
						<span>{result.title}</span>
					</div>
				)}
			</div>
		</div>
	);
}

function SuccessCard({ result }: { result: SuccessResult }) {
	return (
		<div className="my-4 max-w-lg overflow-hidden rounded-2xl border bg-muted/30">
			<div className="px-5 pt-5 pb-4">
				<p className="text-sm font-semibold text-foreground">
					{result.message || "Notion page deleted successfully"}
				</p>
			</div>
			{(result.deleted_from_kb || result.title) && (
				<>
					<div className="mx-5 h-px bg-border/50" />
					<div className="px-5 py-4 space-y-2 text-xs">
						{result.title && (
							<div>
								<span className="font-medium text-muted-foreground">Deleted page: </span>
								<span>{result.title}</span>
							</div>
						)}
						{result.deleted_from_kb && (
							<div className="pt-1">
								<span className="text-green-600 dark:text-green-500">
									Also removed from knowledge base
								</span>
							</div>
						)}
					</div>
				</>
			)}
		</div>
	);
}

export const DeleteNotionPageToolUI = makeAssistantToolUI<
	{ page_title: string; delete_from_kb?: boolean },
	DeleteNotionPageResult
>({
	toolName: "delete_notion_page",
	render: function DeleteNotionPageUI({ result, status }) {
		if (status.type === "running") {
			return (
				<div className="my-4 flex max-w-lg items-center gap-3 rounded-2xl border bg-muted/30 px-5 py-4">
					<Spinner size="sm" className="text-muted-foreground" />
					<p className="text-sm text-muted-foreground">Deleting Notion page...</p>
				</div>
			);
		}

		if (!result) {
			return null;
		}

		if (isInterruptResult(result)) {
			return (
				<ApprovalCard
					interruptData={result}
					onDecision={(decision) => {
						const event = new CustomEvent("hitl-decision", {
							detail: { decisions: [decision] },
						});
						window.dispatchEvent(event);
					}}
				/>
			);
		}

		if (
			typeof result === "object" &&
			result !== null &&
			"status" in result &&
			(result as { status: string }).status === "rejected"
		) {
			return null;
		}

		if (isInfoResult(result)) {
			return <InfoCard result={result} />;
		}

		if (isWarningResult(result)) {
			return <WarningCard result={result} />;
		}

		if (isAuthErrorResult(result)) {
			return <AuthErrorCard result={result} />;
		}

		if (isErrorResult(result)) {
			return <ErrorCard result={result} />;
		}

		return <SuccessCard result={result as SuccessResult} />;
	},
});