import { useEffect, useState } from "react";
import { useCategories } from "../hooks/useCategories";
import { useCreateThread } from "../hooks/useThreads";
import { useUIStore } from "../stores/uiStore";

export function CreateThreadModal() {
	const isOpen = useUIStore((s) => s.createThreadModalOpen);
	const closeModal = useUIStore((s) => s.closeCreateThreadModal);

	const { data: categories } = useCategories();
	const createThread = useCreateThread();

	const [name, setName] = useState("");
	const [categoryId, setCategoryId] = useState<number | null>(null);
	const [error, setError] = useState<string | null>(null);

	// Pre-select first category when categories load
	useEffect(() => {
		if (categories && categories.length > 0 && categoryId === null) {
			setCategoryId(categories[0].id);
		}
	}, [categories, categoryId]);

	if (!isOpen) return null;

	function resetForm() {
		setName("");
		setCategoryId(categories?.[0]?.id ?? null);
		setError(null);
	}

	function handleClose() {
		resetForm();
		closeModal();
	}

	function handleSubmit(e: React.FormEvent) {
		e.preventDefault();
		const trimmed = name.trim();
		if (!trimmed) {
			setError("Thread name is required");
			return;
		}
		if (categoryId === null) {
			setError("Please select a category");
			return;
		}
		setError(null);
		createThread.mutate(
			{ name: trimmed, categoryId },
			{
				onSuccess: () => {
					resetForm();
					closeModal();
				},
				onError: (err) => {
					setError(
						err instanceof Error ? err.message : "Failed to create thread",
					);
				},
			},
		);
	}

	return (
		<div
			role="dialog"
			className="fixed inset-0 z-50 flex items-center justify-center bg-black/50"
			onClick={handleClose}
			onKeyDown={(e) => {
				if (e.key === "Escape") handleClose();
			}}
		>
			<div
				role="document"
				className="w-full max-w-md bg-white rounded-xl shadow-xl p-6"
				onClick={(e) => e.stopPropagation()}
				onKeyDown={() => {}}
			>
				<h2 className="text-lg font-semibold text-gray-900 mb-4">New Thread</h2>

				<form onSubmit={handleSubmit} className="space-y-4">
					<div>
						<label
							htmlFor="thread-name"
							className="block text-sm font-medium text-gray-700 mb-1"
						>
							Thread name
						</label>
						<input
							id="thread-name"
							type="text"
							value={name}
							onChange={(e) => setName(e.target.value)}
							placeholder="e.g. Lightweight sleeping bag"
							className="w-full px-3 py-2 border border-gray-200 rounded-lg text-sm focus:outline-none focus:ring-2 focus:ring-gray-400 focus:border-transparent"
						/>
					</div>

					<div>
						<label
							htmlFor="thread-category"
							className="block text-sm font-medium text-gray-700 mb-1"
						>
							Category
						</label>
						<select
							id="thread-category"
							value={categoryId ?? ""}
							onChange={(e) => setCategoryId(Number(e.target.value))}
							className="w-full px-3 py-2 border border-gray-200 rounded-lg text-sm focus:outline-none focus:ring-2 focus:ring-gray-400 focus:border-transparent bg-white"
						>
							{categories?.map((cat) => (
								<option key={cat.id} value={cat.id}>
									{cat.name}
								</option>
							))}
						</select>
					</div>

					{error && <p className="text-sm text-red-600">{error}</p>}

					<div className="flex justify-end gap-2 pt-2">
						<button
							type="button"
							onClick={handleClose}
							className="px-4 py-2 text-sm font-medium text-gray-700 bg-gray-100 hover:bg-gray-200 rounded-lg transition-colors"
						>
							Cancel
						</button>
						<button
							type="submit"
							disabled={createThread.isPending}
							className="px-4 py-2 text-sm font-medium text-white bg-gray-700 hover:bg-gray-800 disabled:opacity-50 rounded-lg transition-colors"
						>
							{createThread.isPending ? "Creating..." : "Create Thread"}
						</button>
					</div>
				</form>
			</div>
		</div>
	);
}