"use client";

import { useEffect, useState } from "react";
import { useRouter } from "next/navigation";

interface Profile {
  id: string;
  slug: string;
  display_name: string;
  bio: string | null;
  avatar_url: string | null;
  is_public: boolean;
}

interface Product {
  id: string;
  title: string;
  description: string | null;
  url: string;
  image_url: string | null;
  category: string;
  display_order: number;
  click_count: number;
}

const CATEGORIES = ["general", "feeding", "sleep", "play", "clothing"] as const;
const CATEGORY_EMOJI: Record<string, string> = { feeding: "🍼", sleep: "💤", play: "🎮", clothing: "👗", general: "🛍️" };

export default function ProfileSettingsPage() {
  const router = useRouter();
  const [profile, setProfile] = useState<Profile | null>(null);
  const [products, setProducts] = useState<Product[]>([]);
  const [loading, setLoading] = useState(true);
  const [saving, setSaving] = useState(false);
  const [saveMsg, setSaveMsg] = useState("");

  const [slug, setSlug] = useState("");
  const [displayName, setDisplayName] = useState("");
  const [bio, setBio] = useState("");
  const [isPublic, setIsPublic] = useState(false);

  const [showAddProduct, setShowAddProduct] = useState(false);
  const [editingProduct, setEditingProduct] = useState<Product | null>(null);
  const [pTitle, setPTitle] = useState("");
  const [pUrl, setPUrl] = useState("");
  const [pDesc, setPDesc] = useState("");
  const [pImageUrl, setPImageUrl] = useState("");
  const [pCategory, setPCategory] = useState("general");

  useEffect(() => {
    Promise.all([
      fetch("/api/profile").then(r => r.json()),
      fetch("/api/profile/products").then(r => r.json()),
    ]).then(([pd, prods]) => {
      if (pd.profile) {
        setProfile(pd.profile);
        setSlug(pd.profile.slug);
        setDisplayName(pd.profile.display_name);
        setBio(pd.profile.bio ?? "");
        setIsPublic(pd.profile.is_public);
      }
      setProducts(prods.items || []);
      setLoading(false);
    }).catch(() => setLoading(false));
  }, []);

  async function saveProfile() {
    setSaving(true);
    setSaveMsg("");
    const r = await fetch("/api/profile", {
      method: "PUT",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ slug, display_name: displayName, bio: bio || null, is_public: isPublic }),
    });
    const d = await r.json();
    if (r.ok) {
      setProfile(d.profile);
      setSaveMsg(`Saved! View at /m/${d.profile.slug}`);
    } else {
      setSaveMsg(d.error || "Save failed");
    }
    setSaving(false);
  }

  function resetProductForm() {
    setPTitle(""); setPUrl(""); setPDesc(""); setPImageUrl(""); setPCategory("general");
    setShowAddProduct(false); setEditingProduct(null);
  }

  async function saveProduct() {
    const body = { title: pTitle, url: pUrl, description: pDesc || null, image_url: pImageUrl || null, category: pCategory };
    if (editingProduct) {
      await fetch(`/api/profile/products/${editingProduct.id}`, {
        method: "PATCH",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify(body),
      });
    } else {
      await fetch("/api/profile/products", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({ ...body, display_order: products.length }),
      });
    }
    const r = await fetch("/api/profile/products");
    const d = await r.json();
    setProducts(d.items || []);
    resetProductForm();
  }

  async function deleteProduct(id: string) {
    if (!confirm("Remove this product?")) return;
    await fetch(`/api/profile/products/${id}`, { method: "DELETE" });
    setProducts(p => p.filter(x => x.id !== id));
  }

  async function moveProduct(id: string, dir: "up" | "down") {
    const idx = products.findIndex(p => p.id === id);
    if ((dir === "up" && idx === 0) || (dir === "down" && idx === products.length - 1)) return;
    const swapIdx = dir === "up" ? idx - 1 : idx + 1;
    await fetch(`/api/profile/products/${id}`, {
      method: "PATCH", headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ display_order: products[swapIdx].display_order }),
    });
    await fetch(`/api/profile/products/${products[swapIdx].id}`, {
      method: "PATCH", headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ display_order: products[idx].display_order }),
    });
    const r = await fetch("/api/profile/products");
    const d = await r.json();
    setProducts(d.items || []);
  }

  function startEdit(p: Product) {
    setEditingProduct(p); setPTitle(p.title); setPUrl(p.url);
    setPDesc(p.description ?? ""); setPImageUrl(p.image_url ?? ""); setPCategory(p.category);
    setShowAddProduct(true);
  }

  const slugValid = /^[a-z0-9-]{3,40}$/.test(slug);
  const baseUrl = typeof window !== "undefined" ? window.location.origin : "";

  const inputClass = "w-full border border-gray-200 dark:border-gray-600 rounded-xl px-3 py-2.5 text-sm bg-white dark:bg-gray-700 dark:text-white focus:outline-none focus:ring-2 focus:ring-rose-300";

  if (loading) return (
    <div className="min-h-screen flex flex-col items-center justify-center gap-4 bg-gradient-to-br from-rose-50 to-amber-50 dark:from-gray-900 dark:to-gray-800">
      <div className="flex gap-3 text-4xl">
        {["🍼", "😴", "🚼", "👶"].map((e, i) => (
          <span key={i} className="animate-bounce" style={{ animationDelay: `${i * 120}ms` }}>{e}</span>
        ))}
      </div>
      <p className="text-sm text-gray-400">Loading profile…</p>
    </div>
  );

  return (
    <div className="min-h-screen bg-gradient-to-br from-rose-50 to-amber-50 dark:from-gray-900 dark:to-gray-800 pb-24">
      {/* Header */}
      <div className="flex items-center gap-3 p-4">
        <button onClick={() => router.back()} className="p-2 rounded-xl bg-white dark:bg-gray-800 shadow-sm text-xl">←</button>
        <h1 className="text-xl font-bold">My Profile Page</h1>
      </div>

      <div className="px-4 space-y-4">
        {/* Profile section */}
        <div className="bg-white dark:bg-gray-800 rounded-2xl p-4 shadow-sm">
          <h2 className="font-semibold text-gray-800 dark:text-white mb-4">Profile</h2>

          <label className="block text-sm text-gray-500 dark:text-gray-400 mb-1">Display Name</label>
          <input
            value={displayName}
            onChange={e => setDisplayName(e.target.value)}
            className={`${inputClass} mb-3`}
            placeholder="Priya Sharma"
          />

          <label className="block text-sm text-gray-500 dark:text-gray-400 mb-1">Your Page URL</label>
          <div className="flex items-center gap-1 border border-gray-200 dark:border-gray-600 rounded-xl px-3 py-2.5 text-sm mb-1 bg-white dark:bg-gray-700 focus-within:ring-2 focus-within:ring-rose-300">
            <span className="text-gray-400 text-xs whitespace-nowrap">{baseUrl}/m/</span>
            <input
              value={slug}
              onChange={e => setSlug(e.target.value.toLowerCase().replace(/[^a-z0-9-]/g, ""))}
              className="flex-1 bg-transparent outline-none dark:text-white text-sm"
              placeholder="priya-sharma"
            />
          </div>
          {slug && !slugValid && (
            <p className="text-xs text-red-500 mb-2">3–40 chars, lowercase letters, numbers, hyphens only</p>
          )}

          <label className="block text-sm text-gray-500 dark:text-gray-400 mb-1 mt-3">
            Bio <span className="text-gray-400">({bio.length}/200)</span>
          </label>
          <textarea
            value={bio}
            onChange={e => setBio(e.target.value.slice(0, 200))}
            rows={3}
            className={`${inputClass} mb-3 resize-none`}
            placeholder="New mama sharing what works for us 💕"
          />

          <label className="flex items-center gap-3 cursor-pointer mb-4">
            <div
              onClick={() => setIsPublic(v => !v)}
              className={`w-10 h-6 rounded-full transition-colors relative cursor-pointer ${isPublic ? "bg-rose-400" : "bg-gray-300 dark:bg-gray-600"}`}
            >
              <div className={`absolute top-1 w-4 h-4 bg-white rounded-full shadow transition-transform ${isPublic ? "translate-x-5" : "translate-x-1"}`} />
            </div>
            <span className="text-sm text-gray-700 dark:text-gray-300">Make my page public</span>
          </label>

          <button
            onClick={saveProfile}
            disabled={saving || !displayName || !slugValid}
            className="w-full bg-rose-400 text-white rounded-xl py-2.5 font-medium text-sm disabled:opacity-50 active:scale-95 transition-transform"
          >
            {saving ? "Saving…" : "Save Profile"}
          </button>

          {saveMsg && (
            <p className={`text-xs mt-2 text-center ${saveMsg.startsWith("Saved") ? "text-green-600 dark:text-green-400" : "text-red-500"}`}>
              {saveMsg}
            </p>
          )}
        </div>

        {/* Products section */}
        <div className="bg-white dark:bg-gray-800 rounded-2xl p-4 shadow-sm">
          <div className="flex items-center justify-between mb-4">
            <h2 className="font-semibold text-gray-800 dark:text-white">Product Recommendations</h2>
            <button
              onClick={() => { resetProductForm(); setShowAddProduct(true); }}
              className="text-sm text-rose-500 font-medium"
            >
              + Add
            </button>
          </div>

          {/* Add/Edit form */}
          {showAddProduct && (
            <div className="bg-gray-50 dark:bg-gray-700/50 rounded-xl p-4 mb-4 space-y-2">
              <input value={pTitle} onChange={e => setPTitle(e.target.value)}
                placeholder="Product title *" className={inputClass} />
              <input value={pUrl} onChange={e => setPUrl(e.target.value)}
                placeholder="Product URL *" className={inputClass} />
              <textarea value={pDesc} onChange={e => setPDesc(e.target.value)} rows={2}
                placeholder="Description (optional)" className={`${inputClass} resize-none`} />
              <input value={pImageUrl} onChange={e => setPImageUrl(e.target.value)}
                placeholder="Image URL (optional)" className={inputClass} />
              <select value={pCategory} onChange={e => setPCategory(e.target.value)}
                className={inputClass}>
                {CATEGORIES.map(c => <option key={c} value={c}>{CATEGORY_EMOJI[c]} {c.charAt(0).toUpperCase() + c.slice(1)}</option>)}
              </select>
              <div className="flex gap-2 pt-1">
                <button onClick={saveProduct} disabled={!pTitle || !pUrl}
                  className="flex-1 bg-rose-400 text-white rounded-xl py-2.5 text-sm font-medium disabled:opacity-50">
                  {editingProduct ? "Update" : "Add Product"}
                </button>
                <button onClick={resetProductForm}
                  className="flex-1 border border-gray-200 dark:border-gray-600 rounded-xl py-2.5 text-sm text-gray-600 dark:text-gray-300">
                  Cancel
                </button>
              </div>
            </div>
          )}

          {products.length === 0 && !showAddProduct && (
            <div className="text-center py-8">
              <span className="text-4xl">🛍️</span>
              <p className="text-sm text-gray-400 mt-2">No products yet.</p>
              <p className="text-xs text-gray-400">Add your first recommendation!</p>
            </div>
          )}

          <div className="space-y-2">
            {products.map((p, i) => (
              <div key={p.id} className="flex items-center gap-3 p-3 rounded-xl bg-gray-50 dark:bg-gray-700/50">
                <div className="text-2xl">{CATEGORY_EMOJI[p.category] || "🛍️"}</div>
                <div className="flex-1 min-w-0">
                  <p className="text-sm font-medium text-gray-800 dark:text-white truncate">{p.title}</p>
                  <p className="text-xs text-gray-400">{p.category} · {p.click_count} clicks</p>
                </div>
                <div className="flex items-center gap-1">
                  <button onClick={() => moveProduct(p.id, "up")} disabled={i === 0}
                    className="text-gray-400 disabled:opacity-30 text-xs px-1.5 py-1">↑</button>
                  <button onClick={() => moveProduct(p.id, "down")} disabled={i === products.length - 1}
                    className="text-gray-400 disabled:opacity-30 text-xs px-1.5 py-1">↓</button>
                  <button onClick={() => startEdit(p)} className="text-rose-400 text-xs px-1.5 py-1">Edit</button>
                  <button onClick={() => deleteProduct(p.id)} className="text-gray-400 text-xs px-1.5 py-1">✕</button>
                </div>
              </div>
            ))}
          </div>
        </div>
      </div>
    </div>
  );
}