"use client";

import { useCallback, useEffect, useRef, useState } from "react";
import type { MediaCategory, MediaItem } from "@/lib/media";

type FormState = {
  id: number | null;
  title: string;
  date: string;
  category: MediaCategory;
  location: string;
  excerpt: string;
  cover: string;
  featured: boolean;
  content: string;
};

const EMPTY_FORM: FormState = {
  id: null,
  title: "",
  date: new Date().toISOString().slice(0, 10),
  category: "Events",
  location: "",
  excerpt: "",
  cover: "",
  featured: false,
  content: "",
};

const inputClass =
  "w-full rounded-lg border border-navy-200 bg-white px-4 py-2.5 text-navy placeholder:text-navy-300 focus:border-gold focus:outline-none focus:ring-1 focus:ring-gold";

export default function MediaAdminPage() {
  const [authed, setAuthed] = useState<boolean | null>(null);
  const [password, setPassword] = useState("");
  const [loginError, setLoginError] = useState("");
  const [items, setItems] = useState<MediaItem[]>([]);
  const [form, setForm] = useState<FormState>(EMPTY_FORM);
  const [showForm, setShowForm] = useState(false);
  const [saving, setSaving] = useState(false);
  const [message, setMessage] = useState("");
  const [uploading, setUploading] = useState(false);
  const fileRef = useRef<HTMLInputElement>(null);

  const load = useCallback(async () => {
    const res = await fetch("/api/media", { cache: "no-store" });
    if (res.status === 401) {
      setAuthed(false);
      return;
    }
    const data = await res.json();
    setItems(data.items ?? []);
    setAuthed(true);
  }, []);

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

  const login = async (e: React.FormEvent) => {
    e.preventDefault();
    setLoginError("");
    const res = await fetch("/api/media/login", {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ password }),
    });
    if (!res.ok) {
      const data = await res.json().catch(() => ({}));
      setLoginError(data.error ?? "Login failed.");
      return;
    }
    setPassword("");
    load();
  };

  const logout = async () => {
    await fetch("/api/media/logout", { method: "POST" });
    setAuthed(false);
    setItems([]);
  };

  const save = async (e: React.FormEvent) => {
    e.preventDefault();
    setSaving(true);
    setMessage("");
    const res = await fetch(
      form.id ? `/api/media/${form.id}` : "/api/media",
      {
        method: form.id ? "PUT" : "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify(form),
      }
    );
    setSaving(false);
    if (!res.ok) {
      const data = await res.json().catch(() => ({}));
      setMessage(data.error ?? "Save failed.");
      return;
    }
    setMessage(form.id ? "Story updated." : "Story published.");
    setForm(EMPTY_FORM);
    setShowForm(false);
    load();
  };

  const remove = async (item: MediaItem) => {
    if (!window.confirm(`Delete "${item.title}"?`)) return;
    const res = await fetch(`/api/media/${item.id}`, { method: "DELETE" });
    if (res.ok) load();
  };

  const edit = (item: MediaItem) => {
    setForm({
      id: item.id,
      title: item.title,
      date: item.date,
      category: item.category,
      location: item.location,
      excerpt: item.excerpt,
      cover: item.cover ?? "",
      featured: item.featured,
      content: item.content,
    });
    setShowForm(true);
    window.scrollTo({ top: 0, behavior: "smooth" });
  };

  const uploadCover = async (file: File) => {
    setUploading(true);
    setMessage("");
    const body = new FormData();
    body.append("file", file);
    const res = await fetch("/api/media/upload", { method: "POST", body });
    setUploading(false);
    if (!res.ok) {
      const data = await res.json().catch(() => ({}));
      setMessage(data.error ?? "Upload failed.");
      return;
    }
    const data = await res.json();
    setForm((f) => ({ ...f, cover: data.url }));
  };

  if (authed === null) {
    return (
      <main className="flex min-h-[60vh] items-center justify-center">
        <p className="text-navy-400">Loading…</p>
      </main>
    );
  }

  if (!authed) {
    return (
      <main className="flex min-h-[70vh] items-center justify-center px-6 py-28">
        <form
          onSubmit={login}
          className="w-full max-w-sm rounded-2xl border border-navy-100 bg-white p-8 shadow-card"
        >
          <p className="eyebrow">Media Admin</p>
          <h1 className="mt-3 text-2xl font-extrabold text-navy">Sign in</h1>
          <input
            type="password"
            value={password}
            onChange={(e) => setPassword(e.target.value)}
            placeholder="Admin password"
            className={`mt-6 ${inputClass}`}
            autoComplete="current-password"
            required
          />
          {loginError && (
            <p className="mt-3 text-sm font-semibold text-red-600">{loginError}</p>
          )}
          <button type="submit" className="btn-navy mt-6 w-full">
            Sign in
          </button>
        </form>
      </main>
    );
  }

  return (
    <main className="py-28">
      <div className="container-x max-w-4xl">
        <div className="flex flex-wrap items-center justify-between gap-4">
          <div>
            <p className="eyebrow">Media Admin</p>
            <h1 className="mt-3 text-3xl font-extrabold text-navy">
              Manage stories
            </h1>
          </div>
          <div className="flex gap-3">
            <button
              type="button"
              onClick={() => {
                setForm(EMPTY_FORM);
                setShowForm((v) => !v);
              }}
              className="btn-navy"
            >
              {showForm ? "Close editor" : "+ New story"}
            </button>
            <button
              type="button"
              onClick={logout}
              className="rounded-md border border-navy-200 px-5 py-3 text-sm font-semibold text-navy-600 transition-colors hover:border-gold hover:text-gold-600"
            >
              Log out
            </button>
          </div>
        </div>

        {message && (
          <p className="mt-6 rounded-lg bg-navy-50 px-4 py-3 text-sm font-semibold text-navy-600">
            {message}
          </p>
        )}

        {showForm && (
          <form
            onSubmit={save}
            className="mt-8 space-y-5 rounded-2xl border border-navy-100 bg-white p-8 shadow-card"
          >
            <div className="grid gap-5 sm:grid-cols-2">
              <div className="sm:col-span-2">
                <label className="mb-1.5 block text-sm font-semibold text-navy">
                  Title
                </label>
                <input
                  value={form.title}
                  onChange={(e) => setForm({ ...form, title: e.target.value })}
                  className={inputClass}
                  required
                />
              </div>
              <div>
                <label className="mb-1.5 block text-sm font-semibold text-navy">
                  Date
                </label>
                <input
                  type="date"
                  value={form.date}
                  onChange={(e) => setForm({ ...form, date: e.target.value })}
                  className={inputClass}
                  required
                />
              </div>
              <div>
                <label className="mb-1.5 block text-sm font-semibold text-navy">
                  Category
                </label>
                <select
                  value={form.category}
                  onChange={(e) =>
                    setForm({ ...form, category: e.target.value as MediaCategory })
                  }
                  className={inputClass}
                >
                  <option value="Events">Events</option>
                  <option value="Meetings">Meetings</option>
                  <option value="Press">Press</option>
                </select>
              </div>
              <div className="sm:col-span-2">
                <label className="mb-1.5 block text-sm font-semibold text-navy">
                  Location
                </label>
                <input
                  value={form.location}
                  onChange={(e) => setForm({ ...form, location: e.target.value })}
                  placeholder="e.g. Shah Alam, Selangor"
                  className={inputClass}
                />
              </div>
              <div className="sm:col-span-2">
                <label className="mb-1.5 block text-sm font-semibold text-navy">
                  Excerpt (card summary)
                </label>
                <textarea
                  value={form.excerpt}
                  onChange={(e) => setForm({ ...form, excerpt: e.target.value })}
                  rows={2}
                  className={inputClass}
                />
              </div>
              <div className="sm:col-span-2">
                <label className="mb-1.5 block text-sm font-semibold text-navy">
                  Cover image
                </label>
                <div className="flex flex-wrap items-center gap-3">
                  <input
                    value={form.cover}
                    onChange={(e) => setForm({ ...form, cover: e.target.value })}
                    placeholder="Paste a URL or upload a file"
                    className={`${inputClass} flex-1`}
                  />
                  <input
                    ref={fileRef}
                    type="file"
                    accept=".jpg,.jpeg,.png,.webp,.gif,.svg"
                    className="hidden"
                    onChange={(e) => {
                      const file = e.target.files?.[0];
                      if (file) uploadCover(file);
                      e.target.value = "";
                    }}
                  />
                  <button
                    type="button"
                    onClick={() => fileRef.current?.click()}
                    disabled={uploading}
                    className="rounded-md border border-navy-200 px-4 py-2.5 text-sm font-semibold text-navy-600 transition-colors hover:border-gold hover:text-gold-600 disabled:opacity-50"
                  >
                    {uploading ? "Uploading…" : "Upload"}
                  </button>
                </div>
                {form.cover && (
                  // eslint-disable-next-line @next/next/no-img-element
                  <img
                    src={form.cover}
                    alt="Cover preview"
                    className="mt-3 h-32 w-auto rounded-lg border border-navy-100 object-cover"
                  />
                )}
              </div>
              <div className="sm:col-span-2">
                <label className="mb-1.5 block text-sm font-semibold text-navy">
                  Article body (Markdown)
                </label>
                <textarea
                  value={form.content}
                  onChange={(e) => setForm({ ...form, content: e.target.value })}
                  rows={12}
                  placeholder={"Write the story in Markdown…\n\n![Caption](/api/media/image/photo.jpg)"}
                  className={`${inputClass} font-mono text-sm`}
                />
              </div>
              <label className="flex items-center gap-3 text-sm font-semibold text-navy sm:col-span-2">
                <input
                  type="checkbox"
                  checked={form.featured}
                  onChange={(e) => setForm({ ...form, featured: e.target.checked })}
                  className="h-4 w-4 accent-[#c9a24b]"
                />
                Feature this story (shown as the large highlight)
              </label>
            </div>
            <button type="submit" disabled={saving} className="btn-gold disabled:opacity-70">
              {saving ? "Saving…" : form.id ? "Update story" : "Publish story"}
            </button>
          </form>
        )}

        {/* Story list */}
        <div className="mt-10 space-y-4">
          {items.length === 0 && (
            <p className="text-center text-navy-500">
              No stories yet — publish your first one.
            </p>
          )}
          {items.map((item) => (
            <div
              key={item.id}
              className="flex flex-wrap items-center justify-between gap-4 rounded-xl border border-navy-100 bg-white p-5 shadow-card"
            >
              <div className="min-w-0">
                <p className="text-xs font-semibold uppercase tracking-wider text-navy-400">
                  {item.date} · {item.category}
                  {item.featured && <span className="text-gold-600"> · Featured</span>}
                </p>
                <h2 className="mt-1 truncate text-base font-bold text-navy">
                  {item.title}
                </h2>
              </div>
              <div className="flex gap-3">
                <a
                  href={`/media/${item.slug}/`}
                  target="_blank"
                  rel="noreferrer"
                  className="text-sm font-semibold text-navy-500 hover:text-gold-600"
                >
                  View
                </a>
                <button
                  type="button"
                  onClick={() => edit(item)}
                  className="text-sm font-semibold text-gold-600 hover:text-gold-700"
                >
                  Edit
                </button>
                <button
                  type="button"
                  onClick={() => remove(item)}
                  className="text-sm font-semibold text-red-500 hover:text-red-600"
                >
                  Delete
                </button>
              </div>
            </div>
          ))}
        </div>
      </div>
    </main>
  );
}