"use client";

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

interface CommentFormProps {
  slug: string;
  parentId?: string | null;
  replyToName?: string | null;
  initialContent?: string;
  onSubmitted?: () => void;
}

export default function CommentForm({
  slug,
  parentId = null,
  replyToName = null,
  initialContent = "",
  onSubmitted,
}: CommentFormProps) {
  const router = useRouter();
  const [isPending, setIsPending] = useState(false);
  const [authorName, setAuthorName] = useState("");
  const [content, setContent] = useState(initialContent);
  const [error, setError] = useState<string | null>(null);
  const [success, setSuccess] = useState<string | null>(null);

  const apiUrl = process.env.NEXT_PUBLIC_API_URL || "http://localhost:3001";

  const onSubmit = async (e: React.FormEvent) => {
    e.preventDefault();
    setError(null);
    setSuccess(null);

    if (!authorName.trim() || !content.trim()) {
      setError("Please enter your name and comment.");
      return;
    }

    try {
      setIsPending(true);
      const res = await fetch(`${apiUrl}/api/blog/${slug}/comments`, {
        method: "POST",
        headers: {
          "Content-Type": "application/json",
          Accept: "application/json",
        },
        body: JSON.stringify({
          authorName: authorName.trim(),
          content: content.trim(),
          ...(parentId ? { parentId } : {}),
        }),
      });

      const data = await res.json();
      if (!res.ok || !data?.success) {
        throw new Error(data?.message || "Failed to submit comment");
      }

      setAuthorName("");
      setContent("");
      setSuccess("Comment submitted.");

      // Re-fetch server data (blog detail is no-store) to show new comment immediately
      router.refresh();

      onSubmitted?.();
    } catch (err) {
      setError(err instanceof Error ? err.message : "Failed to submit comment");
    } finally {
      setIsPending(false);
    }
  };

  return (
    <div>
      <h3 className="mb-3">
        {parentId ? (replyToName ? `Reply to @${replyToName}` : "Reply") : "Leave A Comment"}
      </h3>

      {error && <p className="text-danger mb-3">{error}</p>}
      {success && <p className="text-success mb-3">{success}</p>}

      <form onSubmit={onSubmit} className="contact-form-items">
        <div className="row g-4">
          <div className="col-lg-6">
            <div className="form-clt">
              <span>Your Name</span>
              <input
                type="text"
                name="authorName"
                placeholder="Your name"
                value={authorName}
                onChange={(e) => setAuthorName(e.target.value)}
                disabled={isPending}
              />
            </div>
          </div>

          <div className="col-lg-12">
            <div className="form-clt">
              <textarea
                name="content"
                placeholder="Type your comment"
                value={content}
                onChange={(e) => setContent(e.target.value)}
                disabled={isPending}
              ></textarea>
            </div>
          </div>

          <div className="col-lg-12 wow fadeInUp" data-wow-delay=".3s">
            <button type="submit" className="theme-btn" disabled={isPending}>
              {isPending ? "Sending..." : "Send Comment"}
              <i className="fa-solid fa-arrow-right"></i>
            </button>
          </div>
        </div>
      </form>
    </div>
  );
}