"use client";

import { useAtomValue, useSetAtom } from "jotai";
import { AlertTriangle, Settings } from "lucide-react";
import {
	createContext,
	type FC,
	type ReactNode,
	useCallback,
	useContext,
	useRef,
	useState,
} from "react";
import {
	globalNewLLMConfigsAtom,
	llmPreferencesAtom,
} from "@/atoms/new-llm-config/new-llm-config-query.atoms";
import { activeSearchSpaceIdAtom } from "@/atoms/search-spaces/search-space-query.atoms";
import { searchSpaceSettingsDialogAtom } from "@/atoms/settings/settings-dialog.atoms";
import { DocumentUploadTab } from "@/components/sources/DocumentUploadTab";
import { Alert, AlertDescription, AlertTitle } from "@/components/ui/alert";
import { Button } from "@/components/ui/button";
import { Dialog, DialogContent, DialogTitle } from "@/components/ui/dialog";

// Context for opening the dialog from anywhere
interface DocumentUploadDialogContextType {
	openDialog: () => void;
	closeDialog: () => void;
}

const DocumentUploadDialogContext = createContext<DocumentUploadDialogContextType | null>(null);

export const useDocumentUploadDialog = () => {
	const context = useContext(DocumentUploadDialogContext);
	if (!context) {
		throw new Error("useDocumentUploadDialog must be used within DocumentUploadDialogProvider");
	}
	return context;
};

// Provider component
export const DocumentUploadDialogProvider: FC<{ children: ReactNode }> = ({ children }) => {
	const [isOpen, setIsOpen] = useState(false);
	const isClosingRef = useRef(false);

	const openDialog = useCallback(() => {
		// Prevent opening if we just closed (debounce)
		if (isClosingRef.current) {
			return;
		}
		setIsOpen(true);
	}, []);

	const closeDialog = useCallback(() => {
		isClosingRef.current = true;
		setIsOpen(false);
		// Reset the flag after a short delay to allow for file picker to close
		setTimeout(() => {
			isClosingRef.current = false;
		}, 300);
	}, []);

	const handleOpenChange = useCallback(
		(open: boolean) => {
			if (!open) {
				// Only close if not already in closing state
				if (!isClosingRef.current) {
					closeDialog();
				}
			} else {
				// Only open if not in the middle of closing
				if (!isClosingRef.current) {
					setIsOpen(true);
				}
			}
		},
		[closeDialog]
	);

	return (
		<DocumentUploadDialogContext.Provider value={{ openDialog, closeDialog }}>
			{children}
			<DocumentUploadPopupContent isOpen={isOpen} onOpenChange={handleOpenChange} />
		</DocumentUploadDialogContext.Provider>
	);
};

// Internal component that renders the dialog
const DocumentUploadPopupContent: FC<{
	isOpen: boolean;
	onOpenChange: (open: boolean) => void;
}> = ({ isOpen, onOpenChange }) => {
	const searchSpaceId = useAtomValue(activeSearchSpaceIdAtom);
	const setSearchSpaceSettingsDialog = useSetAtom(searchSpaceSettingsDialogAtom);
	const { data: preferences = {}, isFetching: preferencesLoading } =
		useAtomValue(llmPreferencesAtom);
	const { data: globalConfigs = [], isFetching: globalConfigsLoading } =
		useAtomValue(globalNewLLMConfigsAtom);

	if (!searchSpaceId) return null;

	const handleSuccess = () => {
		onOpenChange(false);
	};

	// Check if document summary LLM is properly configured
	// - If ID is 0 (Auto mode), we need global configs to be available
	// - If ID is positive (user config) or negative (specific global config), it's configured
	// - If ID is null/undefined, it's not configured
	const docSummaryLlmId = preferences.document_summary_llm_id;
	const isAutoMode = docSummaryLlmId === 0;
	const hasGlobalConfigs = globalConfigs.length > 0;

	const hasDocumentSummaryLLM =
		docSummaryLlmId !== null &&
		docSummaryLlmId !== undefined &&
		// If it's Auto mode, we need global configs to actually be available
		(!isAutoMode || hasGlobalConfigs);

	const isLoading = preferencesLoading || globalConfigsLoading;

	return (
		<Dialog open={isOpen} onOpenChange={onOpenChange}>
			<DialogContent
				onPointerDownOutside={(e) => e.preventDefault()}
				onInteractOutside={(e) => e.preventDefault()}
				onEscapeKeyDown={(e) => e.preventDefault()}
				className="select-none max-w-2xl w-[95vw] sm:w-[640px] h-[min(440px,75dvh)] sm:h-[min(520px,80vh)] flex flex-col p-0 gap-0 overflow-hidden border border-border ring-0 bg-muted dark:bg-muted text-foreground [&>button]:right-3 sm:[&>button]:right-6 [&>button]:top-5 sm:[&>button]:top-8 [&>button]:opacity-80 [&>button]:hover:opacity-100 [&>button]:hover:bg-foreground/10 [&>button]:z-[100] [&>button>svg]:size-4 sm:[&>button>svg]:size-5"
			>
				<DialogTitle className="sr-only">Upload Document</DialogTitle>

				<div className="flex-1 min-h-0 overflow-y-auto overscroll-contain">
					<div className="sticky top-0 z-20 bg-muted px-4 sm:px-6 pt-6 sm:pt-8 pb-10">
						<div className="flex items-center gap-2 mb-1 pr-8 sm:pr-0">
							<h2 className="text-xl sm:text-3xl font-semibold tracking-tight">Upload Documents</h2>
						</div>
						<p className="text-xs sm:text-base text-muted-foreground/80 line-clamp-1">
							Upload and sync your documents to your search space
						</p>
					</div>

					<div className="px-4 sm:px-6 pb-4 sm:pb-6">
						{!isLoading && !hasDocumentSummaryLLM ? (
							<Alert
								variant="destructive"
								className="mb-4 bg-muted/50 rounded-xl border-destructive/30"
							>
								<AlertTriangle className="h-4 w-4" />
								<AlertTitle>LLM Configuration Required</AlertTitle>
								<AlertDescription className="mt-2">
									<p className="mb-3">
										{isAutoMode && !hasGlobalConfigs
											? "Auto mode requires a global LLM configuration. Please add one in Settings"
											: "A Document Summary LLM is required to process uploads, configure one in Settings"}
									</p>
									<Button
										size="sm"
										variant="outline"
										onClick={() => {
											onOpenChange(false);
											setSearchSpaceSettingsDialog({
												open: true,
												initialTab: "models",
											});
										}}
									>
										<Settings className="mr-2 h-4 w-4" />
										Go to Settings
									</Button>
								</AlertDescription>
							</Alert>
						) : (
							<DocumentUploadTab searchSpaceId={searchSpaceId} onSuccess={handleSuccess} />
						)}
					</div>
				</div>
			</DialogContent>
		</Dialog>
	);
};