"use client";

import Link from "next/link";
import { useParams, useRouter } from "next/navigation";
import { useCallback, useEffect, useState } from "react";

import { api } from "@/lib/api/client";
import type { components } from "@/lib/api/schema";
import { Button } from "@/components/ui/button";
import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
import { Input } from "@/components/ui/input";

type Person = components["schemas"]["PersonRead"];

export default function TreeDetailPage() {
  const router = useRouter();
  const params = useParams<{ id: string }>();
  const treeId = params.id;

  const [persons, setPersons] = useState<Person[]>([]);
  const [given, setGiven] = useState("");
  const [surname, setSurname] = useState("");
  const [ready, setReady] = useState(false);

  const load = useCallback(async () => {
    const { data, response } = await api.GET("/api/v1/trees/{tree_id}/persons", {
      params: { path: { tree_id: treeId } },
    });
    if (response.status === 401) {
      router.push("/login");
      return;
    }
    setPersons(data ?? []);
    setReady(true);
  }, [router, treeId]);

  useEffect(() => {
    load();
  }, [load]);

  async function addPerson(e: React.FormEvent) {
    e.preventDefault();
    if (!given.trim() && !surname.trim()) return;
    const { error } = await api.POST("/api/v1/trees/{tree_id}/persons", {
      params: { path: { tree_id: treeId } },
      body: { given: given || null, surname: surname || null },
    });
    if (!error) {
      setGiven("");
      setSurname("");
      load();
    }
  }

  if (!ready) return <p className="text-[var(--muted)]">Loading…</p>;

  return (
    <div className="space-y-6">
      <div className="flex items-center justify-between">
        <Link href="/trees" className="text-sm text-[var(--muted)] hover:underline">
          ← All trees
        </Link>
        <Link href={`/trees/${treeId}/sources`} className="text-sm text-bronze hover:underline">
          Sources →
        </Link>
      </div>

      <Card>
        <CardHeader>
          <CardTitle className="text-base">Add a person</CardTitle>
        </CardHeader>
        <CardContent>
          <form onSubmit={addPerson} className="flex gap-2">
            <Input placeholder="Given name" value={given} onChange={(e) => setGiven(e.target.value)} />
            <Input placeholder="Surname" value={surname} onChange={(e) => setSurname(e.target.value)} />
            <Button type="submit">Add</Button>
          </form>
        </CardContent>
      </Card>

      <div>
        <h2 className="mb-2 text-lg font-semibold">People</h2>
        {persons.length === 0 ? (
          <p className="text-[var(--muted)]">No people yet.</p>
        ) : (
          <ul className="space-y-2">
            {persons.map((person) => (
              <li key={person.id}>
                <Link href={`/trees/${treeId}/persons/${person.id}`}>
                  <Card className="transition-colors hover:border-bronze/50">
                    <CardContent className="p-4">
                      {person.primary_name ?? (
                        <span className="text-[var(--muted)]">Unnamed</span>
                      )}
                    </CardContent>
                  </Card>
                </Link>
              </li>
            ))}
          </ul>
        )}
      </div>
    </div>
  );
}