import { useId, useState, type FormEvent } from "react";
import { useQuery } from "@tanstack/react-query";
import * as stylex from "@stylexjs/stylex";
import {
	forwardZoneCreateMutation,
	forwardZoneDeleteMutation,
	forwardZoneUpdateMutation,
	forwardZonesQuery,
} from "@/lib/queries";
import type { ForwardZone, ForwardZoneInput } from "@/lib/types";
import InlineError from "@/lib/InlineError";
import ConfirmDialog from "@/ui/ConfirmDialog";
import { useCrudForm } from "@/ui/useCrudForm";
import QueryPanel from "./QueryPanel";
import { styles as shared } from "@/ui/styles";
import { colors } from "@/ui/tokens.stylex";

const styles = stylex.create({
	formHeading: {
		fontWeight: 500,
	},
	fieldLabel: {
		display: "block",
		fontSize: "0.875rem",
		lineHeight: "1.25rem",
		fontWeight: 500,
	},
	buttonRow: {
		display: "flex",
		gap: "0.5rem",
	},
	toolbar: {
		display: "flex",
		alignItems: "center",
		justifyContent: "space-between",
		marginTop: "1rem",
	},
	intro: {
		fontSize: "0.875rem",
		lineHeight: "1.25rem",
		color: colors.textMuted,
	},
	table: {
		width: "100%",
		textAlign: "left",
		fontSize: "0.875rem",
		lineHeight: "1.25rem",
	},
	headRow: {
		borderBottomWidth: 1,
		borderBottomStyle: "solid",
		borderBottomColor: colors.border,
		color: colors.textMuted,
	},
	headCell: {
		paddingBlock: "0.5rem",
		paddingRight: "1rem",
		fontWeight: 500,
	},
	headCellLast: {
		paddingBlock: "0.5rem",
	},
	bodyRow: {
		borderBottomWidth: 1,
		borderBottomStyle: "solid",
		borderBottomColor: colors.border,
	},
	cell: {
		paddingBlock: "0.5rem",
		paddingRight: "1rem",
	},
	emptyCell: {
		paddingBlock: "1rem",
		color: colors.textMuted,
	},
	actionCell: {
		paddingBlock: "0.5rem",
		textAlign: "right",
		whiteSpace: "nowrap",
	},
	dangerText: {
		color: colors.danger,
	},
	dimWhenDisabled: {
		opacity: { default: 1, ":disabled": 0.5 },
	},
});

function ZoneForm({
	initial,
	busy,
	error,
	onSubmit,
	onCancel,
}: {
	initial?: ForwardZone;
	busy: boolean;
	error: unknown;
	onSubmit: (input: ForwardZoneInput) => void;
	onCancel: () => void;
}) {
	const id = useId();
	const [zone, setZone] = useState(initial?.zone ?? "");
	const [resolver, setResolver] = useState(initial?.resolver ?? "");

	function submit(event: FormEvent<HTMLFormElement>) {
		event.preventDefault();
		onSubmit({ zone: zone.trim(), resolver: resolver.trim() });
	}

	return (
		<form onSubmit={submit} {...stylex.props(shared.formCard)}>
			<h3 {...stylex.props(styles.formHeading)}>
				{initial === undefined ? "New forward zone" : `Edit ${initial.zone}`}
			</h3>
			<div>
				<label htmlFor={`${id}-zone`} {...stylex.props(styles.fieldLabel)}>
					Zone
				</label>
				<input
					id={`${id}-zone`}
					required
					value={zone}
					onChange={(event) => setZone(event.target.value)}
					placeholder="lan.home"
					{...stylex.props(shared.input, shared.focusRing)}
				/>
			</div>
			<div>
				<label htmlFor={`${id}-resolver`} {...stylex.props(styles.fieldLabel)}>
					Resolver
				</label>
				<input
					id={`${id}-resolver`}
					required
					value={resolver}
					onChange={(event) => setResolver(event.target.value)}
					placeholder="udp://192.168.1.1:53"
					{...stylex.props(shared.input, shared.focusRing)}
				/>
			</div>
			<div {...stylex.props(styles.buttonRow)}>
				<button type="submit" disabled={busy} {...stylex.props(shared.largePrimaryButton, shared.focusRing)}>
					{busy ? "Saving…" : "Save"}
				</button>
				<button type="button" onClick={onCancel} {...stylex.props(shared.largeButton, shared.focusRing)}>
					Cancel
				</button>
			</div>
			<InlineError error={error} />
		</form>
	);
}

export default function ZonesTab() {
	const query = useQuery(forwardZonesQuery());
	const {
		create,
		update,
		remove,
		form,
		openForm,
		closeForm,
		onSubmit,
		onDelete,
		pendingDelete,
		confirmPendingDelete,
		cancelPendingDelete,
	} = useCrudForm<ForwardZone, ForwardZoneInput>({
		create: forwardZoneCreateMutation,
		update: forwardZoneUpdateMutation,
		remove: forwardZoneDeleteMutation,
		confirmDelete: (zone) => `Delete forward zone "${zone.zone}"?`,
	});

	return (
		<div>
			<div {...stylex.props(styles.toolbar)}>
				<p {...stylex.props(styles.intro)}>
					Names under these zones go to their own resolver. Changes apply live.
				</p>
				<button
					type="button"
					onClick={() => openForm({ mode: "create" })}
					{...stylex.props(shared.largePrimaryButton, shared.focusRing)}
				>
					Add zone
				</button>
			</div>
			<InlineError error={remove.error} />
			{form?.mode === "create" && (
				<ZoneForm busy={create.isPending} error={create.error} onSubmit={onSubmit} onCancel={closeForm} />
			)}
			<QueryPanel query={query}>
				{(zones) => (
					<div {...stylex.props(shared.tableWrap)}>
						<table {...stylex.props(styles.table)}>
							<thead>
								<tr {...stylex.props(styles.headRow)}>
									<th scope="col" {...stylex.props(styles.headCell)}>
										Zone
									</th>
									<th scope="col" {...stylex.props(styles.headCell)}>
										Resolver
									</th>
									<th scope="col" {...stylex.props(styles.headCellLast)}>
										<span {...stylex.props(shared.srOnly)}>Actions</span>
									</th>
								</tr>
							</thead>
							<tbody>
								{zones.length === 0 && (
									<tr>
										<td colSpan={3} {...stylex.props(styles.emptyCell)}>
											No forward zones yet.
										</td>
									</tr>
								)}
								{zones.map((zone) => (
									<tr key={zone.id} {...stylex.props(styles.bodyRow)}>
										{form?.mode === "edit" && form.entity.id === zone.id ? (
											<td colSpan={3}>
												<ZoneForm
													initial={zone}
													busy={update.isPending}
													error={update.error}
													onSubmit={onSubmit}
													onCancel={closeForm}
												/>
											</td>
										) : (
											<>
												<td {...stylex.props(styles.cell, shared.mono)}>{zone.zone}</td>
												<td {...stylex.props(styles.cell, shared.mono)}>{zone.resolver}</td>
												<td {...stylex.props(styles.actionCell)}>
													<button
														type="button"
														onClick={() => openForm({ mode: "edit", entity: zone })}
														{...stylex.props(
															shared.rowButton,
															styles.dimWhenDisabled,
															shared.focusRing,
														)}
													>
														Edit
													</button>
													<button
														type="button"
														onClick={() => onDelete(zone)}
														disabled={remove.isPending}
														{...stylex.props(
															shared.rowButton,
															styles.dangerText,
															styles.dimWhenDisabled,
															shared.focusRing,
														)}
													>
														Delete
													</button>
												</td>
											</>
										)}
									</tr>
								))}
							</tbody>
						</table>
					</div>
				)}
			</QueryPanel>
			<ConfirmDialog
				isOpen={pendingDelete !== null}
				title="Delete forward zone"
				message={pendingDelete?.message ?? ""}
				confirmLabel="Delete"
				onConfirm={confirmPendingDelete}
				onCancel={cancelPendingDelete}
			/>
		</div>
	);
}