"use client";

import { useState, useRef, useEffect } from "react";
import { createPortal } from "react-dom";
import Badge from "@/components/ui/Badge";
import { useTranslation } from "@/lib/i18n";

export default function TaskStatusDropdown({
	task,
	size = "sm",
	showDropdown = true,
	onStatusChange,
}) {	
	const { t } = useTranslation();
	const [status, setStatus] = useState(task.status);
	const [loading, setLoading] = useState(false);
	const [isOpen, setIsOpen] = useState(false);
	const [dropdownPosition, setDropdownPosition] = useState({ x: 0, y: 0, position: 'bottom' });
	const [mounted, setMounted] = useState(false);
	const buttonRef = useRef(null);
	const dropdownRef = useRef(null);

	useEffect(() => {
		setMounted(true);
	}, []);

	const statusConfig = {
		not_started: {
			label: t("taskStatus.not_started"),
			variant: "secondary",
		},
		pending: {
			label: t("taskStatus.pending"),
			variant: "warning",
		},
		in_progress: {
			label: t("taskStatus.in_progress"),
			variant: "primary",
		},
		completed: {
			label: t("taskStatus.completed"),
			variant: "success",
		},
		cancelled: {
			label: t("taskStatus.cancelled"),
			variant: "danger",
		},
	};

	const handleChange = async (newStatus) => {
		if (newStatus === status) {
			setIsOpen(false);
			return;
		}

		setStatus(newStatus);
		setLoading(true);
		setIsOpen(false);

		try {
			const res = await fetch(`/api/project-tasks/${task.id}`, {
				method: "PATCH",
				headers: { "Content-Type": "application/json" },
				body: JSON.stringify({ status: newStatus }),
			});

			if (res.ok) {
				// Call the callback if provided (for parent component to refresh)
				if (onStatusChange) {
					onStatusChange(task.id, newStatus);
				}
			} else {
				// Revert on error
				setStatus(task.status);
				alert("Failed to update task status");
			}
		} catch (error) {
			console.error("Failed to update status:", error);
			setStatus(task.status); // Revert on error
			alert("Error updating task status");
		} finally {
			setLoading(false);
		}	};
	// Calculate dropdown position to avoid clipping
	const calculateDropdownPosition = () => {
		if (!buttonRef.current) return;
		
		const buttonRect = buttonRef.current.getBoundingClientRect();
		const viewportHeight = window.innerHeight;
		const viewportWidth = window.innerWidth;
		const dropdownHeight = 180; // Estimated dropdown height
		const dropdownWidth = 140; // Estimated dropdown width
		
		// Check if there's enough space below
		const spaceBelow = viewportHeight - buttonRect.bottom;
		const spaceAbove = buttonRect.top;
		
		// Determine vertical position
		let y, position;
		if (spaceBelow < dropdownHeight && spaceAbove > dropdownHeight) {
			// Show above
			y = buttonRect.top - dropdownHeight - 4;
			position = 'top';
		} else {
			// Show below
			y = buttonRect.bottom + 4;
			position = 'bottom';
		}
		
		// Determine horizontal position (align right edge of dropdown with right edge of button)
		let x = buttonRect.right - dropdownWidth;
		
		// Ensure dropdown doesn't go off screen
		if (x < 8) {
			x = 8; // Minimum margin from left edge
		} else if (x + dropdownWidth > viewportWidth - 8) {
			x = viewportWidth - dropdownWidth - 8; // Ensure it fits within viewport
		}
		
		setDropdownPosition({ x, y, position });
	};	const handleToggle = () => {
		if (!isOpen) {
			calculateDropdownPosition();
		}
		setIsOpen(!isOpen);
	};

	// Close dropdown when clicking outside
	useEffect(() => {
		if (!isOpen) return;

		const handleClickOutside = (event) => {
			if (
				buttonRef.current &&
				!buttonRef.current.contains(event.target) &&
				dropdownRef.current &&
				!dropdownRef.current.contains(event.target)
			) {
				setIsOpen(false);
			}
		};

		const handleScroll = () => {
			if (isOpen) {
				calculateDropdownPosition();
			}
		};

		document.addEventListener('mousedown', handleClickOutside);
		window.addEventListener('scroll', handleScroll);
		window.addEventListener('resize', handleScroll);

		return () => {
			document.removeEventListener('mousedown', handleClickOutside);
			window.removeEventListener('scroll', handleScroll);
			window.removeEventListener('resize', handleScroll);
		};
	}, [isOpen]);

	const currentConfig = statusConfig[status] || {
		label: "Unknown",
		variant: "default",
	};
	if (!showDropdown) {
		return (
			<Badge variant={currentConfig.variant} size={size}>
				{currentConfig.label}
			</Badge>
		);
	}

	// Portal dropdown component
	const DropdownPortal = () => {
		if (!mounted || !isOpen) return null;
		return createPortal(
			<div 
				ref={dropdownRef}
				className="fixed bg-white dark:bg-gray-800 border border-gray-200 dark:border-gray-600 rounded-md shadow-lg z-[9999] min-w-[140px]"
				style={{
					left: `${dropdownPosition.x}px`,
					top: `${dropdownPosition.y}px`,
				}}
			>				{Object.entries(statusConfig).map(([statusKey, config]) => (
					<button
						key={statusKey}
						onClick={() => {
							handleChange(statusKey);
						}}
						className="w-full text-left px-3 py-2 hover:bg-gray-50 dark:hover:bg-gray-700 transition-colors first:rounded-t-md last:rounded-b-md"
					>
						<Badge variant={config.variant} size="sm">
							{config.label}
						</Badge>
					</button>
				))}
			</div>,
			document.body
		);
	};	return (
		<>
			<button
				ref={buttonRef}
				onClick={handleToggle}
				disabled={loading}
				className="focus:outline-none focus:ring-2 focus:ring-blue-500 focus:ring-offset-1 rounded-md"
			>
				<Badge
					variant={currentConfig.variant}
					size={size}
					className={`cursor-pointer hover:opacity-80 transition-opacity ${
						loading ? "opacity-50" : ""
					}`}
				>
					{loading ? "Updating..." : currentConfig.label}
					<svg
						className={`w-3 h-3 ml-1 transition-transform ${
							isOpen ? "rotate-180" : ""
						}`}
						fill="none"
						stroke="currentColor"
						viewBox="0 0 24 24"
					>
						<path
							strokeLinecap="round"
							strokeLinejoin="round"
							strokeWidth={2}
							d="M19 9l-7 7-7-7"
						/>
					</svg>
				</Badge>
			</button>

			{/* Portal-based dropdown */}
			<DropdownPortal />
		</>
	);
}