"use client";

import Link from "next/link";
import { 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 } from "@/components/ui/card";
import { Input } from "@/components/ui/input";

type Tree = components["schemas"]["TreeRead"];

export default function TreesPage() {
  const router = useRouter();
  const [trees, setTrees] = useState<Tree[]>([]);
  const [deleted, setDeleted] = useState<Tree[]>([]);
  const [name, setName] = useState("");
  const [ready, setReady] = useState(false);

  const load = useCallback(async () => {
    const { data, response } = await api.GET("/api/v1/trees");
    if (response.status === 401) {
      router.push("/login");
      return;
    }
    setTrees(data ?? []);
    const del = await api.GET("/api/v1/trees", { params: { query: { deleted: true } } });
    setDeleted(del.data ?? []);
    setReady(true);
  }, [router]);

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

  async function createTree(e: React.FormEvent) {
    e.preventDefault();
    if (!name.trim()) return;
    const { error } = await api.POST("/api/v1/trees", { body: { name } });
    if (!error) {
      setName("");
      load();
    }
  }

  async function remove(id: string) {
    await api.DELETE("/api/v1/trees/{tree_id}", { params: { path: { tree_id: id } } });
    load();
  }
  async function restore(id: string) {
    await api.POST("/api/v1/trees/{tree_id}/restore", { params: { path: { tree_id: id } } });
    load();
  }
  // Optimistic visibility change so the dropdown reflects the pick immediately.
  async function setVisibility(id: string, visibility: NonNullable<Tree["visibility"]>) {
    setTrees((cur) => cur.map((t) => (t.id === id ? { ...t, visibility } : t)));
    await api.PATCH("/api/v1/trees/{tree_id}", {
      params: { path: { tree_id: id } },
      body: { visibility },
    });
    load();
  }

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

  return (
    <div className="space-y-8">
      <h1 className="text-2xl font-semibold">Your trees</h1>

      <Card>
        <CardContent className="p-5">
          <form onSubmit={createTree} className="flex gap-2">
            <Input placeholder="Family name" value={name} onChange={(e) => setName(e.target.value)} />
            <Button type="submit">Create tree</Button>
          </form>
        </CardContent>
      </Card>

      {trees.length === 0 ? (
        <p className="text-[var(--muted)]">No trees yet — create your first one above.</p>
      ) : (
        <ul className="grid gap-3 sm:grid-cols-2">
          {trees.map((tree) => (
            <li key={tree.id}>
              <Card className="transition-colors hover:border-bronze/50">
                <CardContent className="flex items-center justify-between gap-3 p-4">
                  <Link href={`/trees/${tree.id}/tree`} className="min-w-0 flex-1">
                    <div className="truncate font-medium">{tree.name}</div>
                  </Link>
                  <select
                    value={tree.visibility ?? "private"}
                    onChange={(e) =>
                      setVisibility(tree.id, e.target.value as NonNullable<Tree["visibility"]>)
                    }
                    aria-label="Tree visibility"
                    title={
                      "Who can see this tree (living people stay protected regardless):\n" +
                      "• Private — only you and people you invite\n" +
                      "• Members — any signed-in user on this site\n" +
                      "• Unlisted — anyone with the link (not listed or indexed)\n" +
                      "• Public — anyone on the web; listed and search-indexable"
                    }
                    className="rounded-md border border-[var(--border)] bg-[var(--surface)] px-2 py-1 text-xs uppercase tracking-wide text-bronze focus-visible:border-bronze focus-visible:outline-none"
                  >
                    <option value="private">Private</option>
                    <option value="site_members">Public – Members</option>
                    <option value="unlisted">Unlisted</option>
                    <option value="public">Public</option>
                  </select>
                  <button
                    onClick={() => remove(tree.id)}
                    className="text-[var(--muted)] hover:text-bronze"
                    aria-label="Delete tree"
                  >
                    ×
                  </button>
                </CardContent>
              </Card>
            </li>
          ))}
        </ul>
      )}

      {deleted.length > 0 && (
        <div className="space-y-3">
          <h2 className="font-serif text-base font-semibold text-[var(--muted)]">
            Recently deleted
          </h2>
          <ul className="space-y-2">
            {deleted.map((tree) => (
              <li key={tree.id}>
                <Card>
                  <CardContent className="flex items-center justify-between p-4">
                    <span className="text-[var(--muted)]">{tree.name}</span>
                    <Button variant="outline" size="sm" onClick={() => restore(tree.id)}>
                      Restore
                    </Button>
                  </CardContent>
                </Card>
              </li>
            ))}
          </ul>
        </div>
      )}
    </div>
  );
}