"use client";

import { useState, useEffect } from "react";
import { useRouter } from "next/navigation";
import { apiCreatePost, apiMe, fetchBoards, type Board } from "@/lib/api";

export default function ComposePage() {
  const router = useRouter();
  const [boards, setBoards] = useState<Board[]>([]);
  const [boardId, setBoardId] = useState<number>(0);
  const [title, setTitle] = useState("");
  const [content, setContent] = useState("");
  const [tags, setTags] = useState("");
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState("");

  useEffect(() => {
    // 通过 /api/me 检查登录态（HttpOnly cookie 自动携带）
    apiMe()
      .then((res) => {
        if (!res.user) {
          router.push("/login?redirect=/compose");
          return;
        }
        fetchBoards().then((data) => {
          setBoards(data.boards);
          if (data.boards.length > 0) setBoardId(data.boards[0].id);
        });
      })
      .catch(() => router.push("/login?redirect=/compose"));
  }, [router]);

  const handleSubmit = async (e: React.FormEvent) => {
    e.preventDefault();
    setLoading(true);
    setError("");
    try {
      const res = await apiCreatePost({
        board_id: boardId,
        title,
        content,
        tags,
        post_type: "normal",
      });
      if (res.post) {
        router.push(`/post/${res.post.id}`);
      } else {
        setError(res.error || "发帖失败");
      }
    } finally {
      setLoading(false);
    }
  };

  return (
    <div className="max-w-3xl mx-auto">
      <h1 className="text-2xl font-bold mb-6">发布新帖</h1>
      <form onSubmit={handleSubmit} className="space-y-4">
        {error && (
          <div className="p-3 rounded-lg bg-red-50 text-red-600 text-sm">{error}</div>
        )}
        <div>
          <label className="block text-sm mb-1" style={{ color: "var(--text-secondary)" }}>板块</label>
          <select
            value={boardId}
            onChange={(e) => setBoardId(Number(e.target.value))}
            className="w-full px-3 py-2 rounded-lg border"
            style={{ borderColor: "var(--border)", background: "var(--bg)", color: "var(--text)" }}
          >
            {boards.map((b) => (
              <option key={b.id} value={b.id}>{b.name}</option>
            ))}
          </select>
        </div>
        <div>
          <label className="block text-sm mb-1" style={{ color: "var(--text-secondary)" }}>标题</label>
          <input
            type="text"
            value={title}
            onChange={(e) => setTitle(e.target.value)}
            required
            maxLength={256}
            placeholder="帖子标题"
            className="w-full px-3 py-2 rounded-lg border"
            style={{ borderColor: "var(--border)", background: "var(--bg)", color: "var(--text)" }}
          />
        </div>
        <div>
          <label className="block text-sm mb-1" style={{ color: "var(--text-secondary)" }}>标签（逗号分隔，可选）</label>
          <input
            type="text"
            value={tags}
            onChange={(e) => setTags(e.target.value)}
            placeholder="例如：技术,Go"
            className="w-full px-3 py-2 rounded-lg border"
            style={{ borderColor: "var(--border)", background: "var(--bg)", color: "var(--text)" }}
          />
        </div>
        <div>
          <label className="block text-sm mb-1" style={{ color: "var(--text-secondary)" }}>内容（支持 Markdown）</label>
          <textarea
            value={content}
            onChange={(e) => setContent(e.target.value)}
            required
            rows={12}
            placeholder="帖子内容，支持 Markdown 格式..."
            className="w-full px-3 py-2 rounded-lg border resize-y font-mono"
            style={{ borderColor: "var(--border)", background: "var(--bg)", color: "var(--text)" }}
          />
        </div>
        <button
          type="submit"
          disabled={loading || !title.trim() || !content.trim()}
          className="px-6 py-2 rounded-lg text-white disabled:opacity-50"
          style={{ background: "var(--primary)" }}
        >
          {loading ? "发布中..." : "发布帖子"}
        </button>
      </form>
    </div>
  );
}