import { useEffect, useState } from "react";
import { useCategories } from "../hooks/useCategories";
import { useCreateItem } from "../hooks/useItems";
import { CategoryPicker } from "./CategoryPicker";
import { ImageUpload } from "./ImageUpload";

interface ManualEntryFormProps {
	initialName?: string;
	onSuccess: (itemName: string) => void;
}

export function ManualEntryForm({
	initialName,
	onSuccess,
}: ManualEntryFormProps) {
	const { data: categories } = useCategories();
	const createItem = useCreateItem();

	const [name, setName] = useState(initialName ?? "");
	const [categoryId, setCategoryId] = useState<number | null>(null);
	const [weightGrams, setWeightGrams] = useState("");
	const [priceDollars, setPriceDollars] = useState("");
	const [purchasePrice, setPurchasePrice] = useState("");
	const [notes, setNotes] = useState("");
	const [productUrl, setProductUrl] = useState("");
	const [imageFilename, setImageFilename] = useState<string | 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]);

	function handleSubmit(e: React.FormEvent) {
		e.preventDefault();

		if (!name.trim()) {
			setError("Name is required");
			return;
		}
		if (categoryId === null) {
			setError("Please select a category");
			return;
		}

		setError(null);

		createItem.mutate(
			{
				name: name.trim(),
				categoryId,
				weightGrams: weightGrams ? Number(weightGrams) : undefined,
				priceCents: priceDollars
					? Math.round(Number(priceDollars) * 100)
					: undefined,
				purchasePriceCents: purchasePrice
					? Math.round(Number(purchasePrice) * 100)
					: undefined,
				notes: notes || undefined,
				productUrl: productUrl || undefined,
				imageFilename: imageFilename ?? undefined,
			},
			{
				onSuccess: (item) => {
					onSuccess(item.name);
				},
				onError: (err) => {
					setError(err instanceof Error ? err.message : "Failed to save");
				},
			},
		);
	}

	return (
		<div className="max-w-2xl mx-auto px-4 sm:px-6 lg:px-8 py-4">
			<form onSubmit={handleSubmit} className="space-y-4">
				{/* Image upload — hero position */}
				<div>
					<ImageUpload
						value={imageFilename}
						onChange={(filename) => setImageFilename(filename)}
					/>
				</div>

				{/* Name */}
				<div>
					<label
						htmlFor="manual-name"
						className="block text-sm font-medium text-gray-700 mb-1"
					>
						Name <span className="text-red-500">*</span>
					</label>
					<input
						id="manual-name"
						type="text"
						value={name}
						onChange={(e) => setName(e.target.value)}
						placeholder="Item name"
						required
						className="w-full px-3 py-2 border border-gray-200 rounded-lg text-sm text-gray-900 placeholder-gray-400 focus:outline-none focus:ring-2 focus:ring-gray-400 focus:border-transparent"
					/>
				</div>

				{/* Category */}
				<div>
					<label className="block text-sm font-medium text-gray-700 mb-1">
						Category
					</label>
					<CategoryPicker
						value={categoryId ?? 0}
						onChange={(id) => setCategoryId(id)}
					/>
				</div>

				{/* Weight and Price row */}
				<div className="grid grid-cols-2 gap-3">
					<div>
						<label
							htmlFor="manual-weight"
							className="block text-sm font-medium text-gray-700 mb-1"
						>
							Weight (g)
						</label>
						<input
							id="manual-weight"
							type="number"
							value={weightGrams}
							onChange={(e) => setWeightGrams(e.target.value)}
							placeholder="0"
							min="0"
							step="1"
							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="manual-price"
							className="block text-sm font-medium text-gray-700 mb-1"
						>
							MSRP ($)
						</label>
						<input
							id="manual-price"
							type="number"
							value={priceDollars}
							onChange={(e) => setPriceDollars(e.target.value)}
							placeholder="0.00"
							min="0"
							step="0.01"
							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>

				{/* Purchase Price */}
				<div>
					<label
						htmlFor="manual-purchase-price"
						className="block text-sm font-medium text-gray-700 mb-1"
					>
						Purchase Price ($)
					</label>
					<input
						id="manual-purchase-price"
						type="number"
						value={purchasePrice}
						onChange={(e) => setPurchasePrice(e.target.value)}
						placeholder="0.00"
						min="0"
						step="0.01"
						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>

				{/* Product URL */}
				<div>
					<label
						htmlFor="manual-product-url"
						className="block text-sm font-medium text-gray-700 mb-1"
					>
						Product Link
					</label>
					<input
						id="manual-product-url"
						type="url"
						value={productUrl}
						onChange={(e) => setProductUrl(e.target.value)}
						placeholder="https://..."
						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>

				{/* Notes */}
				<div>
					<label
						htmlFor="manual-notes"
						className="block text-sm font-medium text-gray-700 mb-1"
					>
						Notes
					</label>
					<textarea
						id="manual-notes"
						value={notes}
						onChange={(e) => setNotes(e.target.value)}
						placeholder="Optional notes..."
						rows={3}
						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 resize-none"
					/>
				</div>

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

				{/* Submit */}
				<button
					type="submit"
					disabled={createItem.isPending || !name.trim() || categoryId === null}
					className="w-full px-4 py-2.5 text-sm font-medium text-white bg-gray-900 rounded-lg hover:bg-gray-800 disabled:opacity-50 transition-colors"
				>
					{createItem.isPending ? "Saving..." : "Add to Collection"}
				</button>
			</form>
		</div>
	);
}