"use client";

import { z } from "zod";
import { useForm } from "react-hook-form";
import { zodResolver } from "@hookform/resolvers/zod";
import { toast } from "@/hooks/useToast";
import { Button } from "@/components/ui/button";
import {
	Dialog,
	DialogContent,
	DialogDescription,
	DialogFooter,
	DialogHeader,
	DialogTitle
} from "@/components/ui/dialog";
import {
	Form,
	FormControl,
	FormField,
	FormItem,
	FormLabel,
	FormMessage
} from "@/components/ui/form";
import { Input } from "@/components/ui/input";
import { ScrollArea } from "@/components/ui/scroll-area";
import { Purchase } from "../data/schema";
import { usePurchase } from "@/hooks/usePurchase";

const formSchema = z.object({
	user_id: z.number({ invalid_type_error: "User ID must be a number." }),
	used_coupon_id: z.number().nullable().optional(),
	total: z
		.number({ invalid_type_error: "Total must be a number." })
		.min(0, { message: "Total must be at least 0." }),
	date_purchased: z.coerce.date({
		errorMap: () => ({ message: "Invalid date." })
	}),
	isEdit: z.boolean()
});

type PurchaseForm = z.infer<typeof formSchema>;

interface Props {
	currentRow?: Purchase;
	open: boolean;
	onOpenChange: (open: boolean) => void;
}

export function PurchasesActionDialog({
	currentRow,
	open,
	onOpenChange
}: Props) {
	const { createPurchase, updatePurchase } = usePurchase(currentRow?.id);
	const isEdit = !!currentRow;

	const form = useForm<PurchaseForm>({
		resolver: zodResolver(formSchema),
		defaultValues: isEdit
			? {
					...currentRow,
					date_purchased: new Date(currentRow.date_purchased),
					isEdit
				}
			: {
					user_id: 0,
					used_coupon_id: null,
					total: 0,
					date_purchased: new Date(),
					isEdit
				}
	});

	const onSubmit = (values: PurchaseForm) => {
		try {
			const payload = {
				...values,
				date_purchased: values.date_purchased.toISOString()
			};

			if (isEdit) {
				updatePurchase.mutate({ ...currentRow, ...payload });
			} else {
				createPurchase.mutate({...payload, used_coupon_id: payload.used_coupon_id ?? null });
			}

			toast({
				title: isEdit ? "Purchase updated" : "Purchase created",
				description: `User #${values.user_id} • ${values.total.toFixed(2)}€`
			});
			form.reset();
			onOpenChange(false);
		} catch (err) {
			toast({
				title: "An error occurred",
				description: (err as Error).message,
				variant: "destructive"
			});
		}
	};

	return (
		<Dialog
			open={open}
			onOpenChange={(state) => {
				form.reset();
				onOpenChange(state);
			}}>
			<DialogContent className="sm:max-w-lg">
				<DialogHeader className="text-left">
					<DialogTitle>
						{isEdit ? "Edit Purchase" : "Add New Purchase"}
					</DialogTitle>
					<DialogDescription>
						{isEdit
							? "Update the purchase details below."
							: "Record a new purchase."}
					</DialogDescription>
				</DialogHeader>

				<ScrollArea className="-mr-4 h-[26.25rem] w-full py-1 pr-4">
					<Form {...form}>
						<form
							id="purchase-form"
							onSubmit={form.handleSubmit(onSubmit)}
							className="space-y-4 p-0.5">
							<FormField
								control={form.control}
								name="user_id"
								render={({ field }) => (
									<FormItem>
										<FormLabel>User ID</FormLabel>
										<FormControl>
											<Input
												type="number"
												placeholder="e.g., 12"
												{...field}
												onChange={(e) => field.onChange(Number(e.target.value))}
											/>
										</FormControl>
										<FormMessage />
									</FormItem>
								)}
							/>

							<FormField
								control={form.control}
								name="used_coupon_id"
								render={({ field }) => (
									<FormItem>
										<FormLabel>Coupon ID (optional)</FormLabel>
										<FormControl>
											<Input
												type="number"
												placeholder="e.g., 5"
												value={field.value ?? ""}
												onChange={(e) => {
													const value = e.target.value;
													field.onChange(value === "" ? null : Number(value));
												}}
											/>
										</FormControl>
										<FormMessage />
									</FormItem>
								)}
							/>

							<FormField
								control={form.control}
								name="total"
								render={({ field }) => (
									<FormItem>
										<FormLabel>Total (€)</FormLabel>
										<FormControl>
											<Input
												type="number"
												step="0.01"
												placeholder="e.g., 12.50"
												{...field}
												onChange={(e) => field.onChange(Number(e.target.value))}
											/>
										</FormControl>
										<FormMessage />
									</FormItem>
								)}
							/>

							<FormField
								control={form.control}
								name="date_purchased"
								render={({ field }) => (
									<FormItem>
										<FormLabel>Purchase Date</FormLabel>
										<FormControl>
											<Input
												type="datetime-local"
												value={field.value.toISOString().slice(0, 16)}
												onChange={(e) =>
													field.onChange(new Date(e.target.value))
												}
											/>
										</FormControl>
										<FormMessage />
									</FormItem>
								)}
							/>
						</form>
					</Form>
				</ScrollArea>

				<DialogFooter>
					<Button type="submit" form="purchase-form">
						Save changes
					</Button>
				</DialogFooter>
			</DialogContent>
		</Dialog>
	);
}