"use client";

import { useMemo, useState } from "react";
import Link from "next/link";
import type { AssignmentStatus } from "@prisma/client";
import { Badge } from "@/components/ui/badge";

type CrewRow = {
  id: string;
  name: string;
  employeeId: string;
  rank: string;
  location: string;
  status: AssignmentStatus | null;
};

const INPUT =
  "rounded-lg border border-neutral-300 px-3 py-2 text-sm focus:border-primary-500 focus:outline-none focus:ring-2 focus:ring-primary-500/20";

function StatusBadge({ status }: { status: AssignmentStatus | null }) {
  if (status === "ACTIVE") return <Badge variant="success">Active</Badge>;
  if (status === "ON_LEAVE") return <Badge variant="warning">On leave</Badge>;
  return <Badge variant="secondary">—</Badge>;
}

export function CrewDirectory({ crew }: { crew: CrewRow[] }) {
  const [search, setSearch] = useState("");
  const [location, setLocation] = useState("ALL");

  const locations = useMemo(
    () => Array.from(new Set(crew.map((c) => c.location).filter((l) => l !== "—"))).sort(),
    [crew]
  );

  const filtered = useMemo(() => {
    const q = search.trim().toLowerCase();
    return crew.filter((c) => {
      if (location !== "ALL" && c.location !== location) return false;
      if (q && !`${c.name} ${c.employeeId} ${c.rank}`.toLowerCase().includes(q)) return false;
      return true;
    });
  }, [crew, search, location]);

  return (
    <div>
      <div className="mb-6">
        <h1 className="text-2xl font-semibold text-neutral-900">Crew</h1>
        <p className="text-sm text-neutral-500 mt-0.5">{crew.length} active crew member{crew.length === 1 ? "" : "s"}</p>
      </div>

      <div className="mb-4 flex flex-wrap items-center gap-3">
        <input className={`${INPUT} flex-1 min-w-[200px]`} placeholder="Search name, employee no or rank…" value={search} onChange={(e) => setSearch(e.target.value)} />
        <select className={INPUT} value={location} onChange={(e) => setLocation(e.target.value)}>
          <option value="ALL">All vessels / sites</option>
          {locations.map((l) => <option key={l} value={l}>{l}</option>)}
        </select>
      </div>

      <div className="rounded-lg border border-neutral-200 bg-white overflow-hidden">
        <table className="w-full text-sm">
          <thead>
            <tr className="border-b border-neutral-200 bg-neutral-50 text-left text-xs font-semibold text-neutral-500 uppercase tracking-wide">
              <th className="px-4 py-3">Name</th>
              <th className="px-4 py-3">Employee</th>
              <th className="px-4 py-3">Rank</th>
              <th className="px-4 py-3">Vessel / site</th>
              <th className="px-4 py-3">Status</th>
            </tr>
          </thead>
          <tbody>
            {filtered.length === 0 ? (
              <tr><td colSpan={5} className="px-4 py-12 text-center text-neutral-400">
                {crew.length === 0 ? "No crew onboarded yet." : "No crew match these filters."}
              </td></tr>
            ) : (
              filtered.map((c) => (
                <tr key={c.id} className="border-b border-neutral-100 last:border-0 hover:bg-neutral-50">
                  <td className="px-4 py-3">
                    <Link href={`/crewing/crew/${c.id}`} className="font-medium text-neutral-900 hover:text-primary-700">{c.name}</Link>
                  </td>
                  <td className="px-4 py-3 font-mono text-xs text-neutral-600">{c.employeeId}</td>
                  <td className="px-4 py-3 text-neutral-700">{c.rank}</td>
                  <td className="px-4 py-3 text-neutral-700">{c.location}</td>
                  <td className="px-4 py-3"><StatusBadge status={c.status} /></td>
                </tr>
              ))
            )}
          </tbody>
        </table>
      </div>
    </div>
  );
}