import { useState, useMemo, useCallback } from "react";
import { createFileRoute, Link } from "@tanstack/react-router";
import { Search, Plus, Pencil, Trash2, Truck } from "lucide-react";
import { GridTable } from "#/components/GridTable";
import type { GridTableColumn } from "#/components/GridTable";
import {
	useListDistributors,
	useRemoveDistributor,
	trpc,
} from "shared-react";

interface DistributorRow {
	id: number;
	agency: string;
	contact: string;
	mobile: string;
	address: string | null;
}

function makeColumns(
	onDelete: (row: DistributorRow) => void,
): GridTableColumn<DistributorRow>[] {
	return [
		{
			id: "agency",
			header: "Agency Name",
			cell: ({ row }) => (
				<Link
					to="/distributors/$id"
					params={{ id: row.id.toString() }}
					className="font-medium text-blue-600 hover:underline"
				>
					{row.agency}
				</Link>
			),
		},
		{
			id: "contact",
			header: "Contact Person",
			cell: ({ row }) => (
				<span className="text-sm">{row.contact}</span>
			),
		},
		{
			id: "mobile",
			header: "Contact Mobile",
			cell: ({ row }) => (
				<span className="text-sm text-slate-600 font-mono">
					{row.mobile}
				</span>
			),
		},
		{
			id: "address",
			header: "Address",
			cell: ({ row }) => (
				<span
					className="text-sm text-slate-600 max-w-[200px] truncate block"
					title={row.address ?? undefined}
				>
					{row.address || "—"}
				</span>
			),
		},
		{
			id: "actions",
			header: "Actions",
			size: 90,
			cell: ({ row }) => (
				<div className="flex items-center justify-center gap-1">
					<button
						type="button"
						className="w-8 h-8 flex items-center justify-center rounded-md text-slate-500 hover:text-blue-600 hover:bg-blue-50 transition-colors"
						aria-label={`Edit ${row.agency}`}
					>
						<Pencil className="w-[15px] h-[15px]" />
					</button>
					<button
						type="button"
						className="w-8 h-8 flex items-center justify-center rounded-md text-slate-500 hover:text-red-600 hover:bg-red-50 transition-colors"
						aria-label={`Delete ${row.agency}`}
						onClick={() => onDelete(row)}
					>
						<Trash2 className="w-[15px] h-[15px]" />
					</button>
				</div>
			),
		},
	];
}

export const Route = createFileRoute("/distributors/")({
	component: DistributorsIndexPage,
	staticData: {
		title: "Distributors",
		subtitle: "Manage product distributors & agencies",
	},
});

function DistributorsIndexPage() {
	const [searchQuery, setSearchQuery] = useState("");
	const { data: distributors, isLoading, error } = useListDistributors();
	const removeMutation = useRemoveDistributor();
	const utils = trpc.useUtils();

	const handleDelete = useCallback(
		(row: DistributorRow) => {
			if (!confirm(`Delete ${row.agency}?`)) return;
			removeMutation.mutate(
				{ id: row.id },
				{
					onSuccess: () => utils.distributor.list.invalidate(),
				},
			);
		},
		[removeMutation, utils],
	);

	const columns = useMemo(() => makeColumns(handleDelete), [handleDelete]);

	const filtered = useMemo(() => {
		const q = searchQuery.toLowerCase().trim();
		if (!q) return distributors ?? [];
		return (distributors ?? []).filter((d) => {
			return (
				d.agency.toLowerCase().includes(q) ||
				d.contact.toLowerCase().includes(q) ||
				d.mobile.includes(q)
			);
		});
	}, [searchQuery, distributors]);

	if (isLoading) {
		return (
			<div className="text-sm text-slate-600 py-8">
				Loading distributors...
			</div>
		);
	}

	if (error) {
		return (
			<div className="text-sm text-red-600 py-8">
				Failed to load distributors.
			</div>
		);
	}

	return (
		<div>
			<div className="flex items-center gap-3 mb-5 flex-wrap">
				<div className="flex items-center gap-2 flex-1 min-w-[200px] max-w-[400px] px-3.5 py-2 bg-white rounded-md border border-slate-200 transition-all duration-200 focus-within:border-blue-600 focus-within:shadow-[0_0_0_3px_rgba(37,99,235,0.1)]">
					<Search className="w-4 h-4 text-slate-600 shrink-0" />
					<input
						type="text"
						value={searchQuery}
						onChange={(e) => setSearchQuery(e.target.value)}
						placeholder="Search distributors..."
						className="bg-transparent border-none outline-none text-sm text-slate-900 w-full placeholder:text-slate-400"
					/>
				</div>
				<Link
					to="/distributors/add"
					className="inline-flex items-center gap-1.5 px-4 py-2 bg-blue-600 text-white rounded-md text-sm font-medium hover:bg-blue-700 transition-colors"
				>
					<Plus className="w-[15px] h-[15px]" />
					Add Distributor
				</Link>
			</div>

			<GridTable
				columns={columns}
				data={filtered}
				emptyState={
					<div className="flex flex-col items-center py-16 px-6 text-slate-600">
						<Truck className="w-12 h-12 mb-4 opacity-40" />
						<h3 className="text-base font-semibold text-slate-900 mb-1.5">
							No distributors found
						</h3>
						<p className="text-sm">
							{searchQuery
								? "No distributors match your search. Try a different term."
								: "Add your first distributor to get started."}
						</p>
					</div>
				}
			/>
		</div>
	);
}