import { useState } from "react";
import { useDeleteCategory, useUpdateCategory } from "../hooks/useCategories";
import { useCurrency } from "../hooks/useCurrency";
import { useWeightUnit } from "../hooks/useWeightUnit";
import { formatPrice, formatWeight } from "../lib/formatters";
import { LucideIcon } from "../lib/iconData";
import { IconPicker } from "./IconPicker";

interface CategoryHeaderProps {
	categoryId: number;
	name: string;
	icon: string;
	totalWeight: number;
	totalCost: number;
	itemCount: number;
}

export function CategoryHeader({
	categoryId,
	name,
	icon,
	totalWeight,
	totalCost,
	itemCount,
}: CategoryHeaderProps) {
	const unit = useWeightUnit();
	const currency = useCurrency();
	const [isEditing, setIsEditing] = useState(false);
	const [editName, setEditName] = useState(name);
	const [editIcon, setEditIcon] = useState(icon);
	const updateCategory = useUpdateCategory();
	const deleteCategory = useDeleteCategory();

	const isUncategorized = categoryId === 1;

	function handleSave() {
		if (!editName.trim()) return;
		updateCategory.mutate(
			{ id: categoryId, name: editName.trim(), icon: editIcon },
			{ onSuccess: () => setIsEditing(false) },
		);
	}

	function handleDelete() {
		if (
			confirm(
				`Delete category "${name}"? Items will be moved to Uncategorized.`,
			)
		) {
			deleteCategory.mutate(categoryId);
		}
	}

	if (isEditing) {
		return (
			<div className="flex items-center gap-3 py-4">
				<IconPicker value={editIcon} onChange={setEditIcon} size="sm" />
				<input
					type="text"
					value={editName}
					onChange={(e) => setEditName(e.target.value)}
					className="text-lg font-semibold border border-gray-200 rounded-md px-2 py-1"
					onKeyDown={(e) => {
						if (e.key === "Enter") handleSave();
						if (e.key === "Escape") setIsEditing(false);
					}}
				/>
				<button
					type="button"
					onClick={handleSave}
					className="text-sm text-gray-600 hover:text-gray-800 font-medium"
				>
					Save
				</button>
				<button
					type="button"
					onClick={() => setIsEditing(false)}
					className="text-sm text-gray-400 hover:text-gray-600"
				>
					Cancel
				</button>
			</div>
		);
	}

	return (
		<div className="group flex items-center gap-3 py-4">
			<LucideIcon name={icon} size={22} className="text-gray-500" />
			<h2 className="text-lg font-semibold text-gray-900">{name}</h2>
			<span className="text-sm text-gray-400">
				{itemCount} {itemCount === 1 ? "item" : "items"} ·{" "}
				{formatWeight(totalWeight, unit)} · {formatPrice(totalCost, currency)}
			</span>
			{!isUncategorized && (
				<div className="ml-auto flex items-center gap-1 opacity-0 group-hover:opacity-100 transition-opacity">
					<button
						type="button"
						onClick={() => {
							setEditName(name);
							setEditIcon(icon);
							setIsEditing(true);
						}}
						className="p-1 text-gray-400 hover:text-gray-600 rounded"
						title="Edit category"
					>
						<svg
							className="w-4 h-4"
							fill="none"
							stroke="currentColor"
							viewBox="0 0 24 24"
						>
							<path
								strokeLinecap="round"
								strokeLinejoin="round"
								strokeWidth={2}
								d="M15.232 5.232l3.536 3.536m-2.036-5.036a2.5 2.5 0 113.536 3.536L6.5 21.036H3v-3.572L16.732 3.732z"
							/>
						</svg>
					</button>
					<button
						type="button"
						onClick={handleDelete}
						className="p-1 text-gray-400 hover:text-red-500 rounded"
						title="Delete category"
					>
						<svg
							className="w-4 h-4"
							fill="none"
							stroke="currentColor"
							viewBox="0 0 24 24"
						>
							<path
								strokeLinecap="round"
								strokeLinejoin="round"
								strokeWidth={2}
								d="M19 7l-.867 12.142A2 2 0 0116.138 21H7.862a2 2 0 01-1.995-1.858L5 7m5 4v6m4-6v6m1-10V4a1 1 0 00-1-1h-4a1 1 0 00-1 1v3M4 7h16"
							/>
						</svg>
					</button>
				</div>
			)}
		</div>
	);
}
