"use client";

import { FormEvent, useEffect, useMemo, useState } from "react";

type Source = { id: number; name: string };
const draftKey = "mebbling:publish-draft";

export function PublishForm({ sources }: { sources: Source[] }) {
  const [error, setError] = useState(""); const [submitting, setSubmitting] = useState(false); const [content, setContent] = useState(""); const [tags, setTags] = useState(""); const [sourceId, setSourceId] = useState(String(sources[0]?.id || "")); const [preview, setPreview] = useState(false);
  useEffect(() => { try { const saved = JSON.parse(localStorage.getItem(draftKey) || "{}"); setContent(saved.content || ""); setTags(saved.tags || ""); if (saved.sourceId && sources.some((source) => String(source.id) === saved.sourceId)) setSourceId(saved.sourceId); } catch {} }, [sources]);
  useEffect(() => { localStorage.setItem(draftKey, JSON.stringify({ content, tags, sourceId })); }, [content, tags, sourceId]);
  const draftState = useMemo(() => content ? "草稿已自動儲存於此瀏覽器" : "", [content]);
  async function submit(event: FormEvent<HTMLFormElement>) { event.preventDefault(); setSubmitting(true); setError(""); try { const response = await fetch("/api/posts", { method: "POST", body: new FormData(event.currentTarget), headers: { Accept: "application/json" } }); const result = await response.json(); if (!response.ok) throw new Error(result.error || "發佈失敗"); localStorage.removeItem(draftKey); window.location.assign(`/posts/${result.id}`); } catch (reason) { setError(reason instanceof Error ? reason.message : "發佈失敗"); setSubmitting(false); } }
  return <form onSubmit={submit} encType="multipart/form-data"><label>內容（Markdown）<textarea name="content" value={content} onChange={(event) => setContent(event.target.value)} required /></label><div className="row"><button type="button" onClick={() => setPreview(!preview)}>{preview ? "繼續編輯" : "預覽"}</button><span className="meta">{draftState}</span></div>{preview && <section className="card"><pre className="markdown">{content || "（尚無內容）"}</pre></section>}<label>標籤（逗號分隔）<input name="tags" value={tags} onChange={(event) => setTags(event.target.value)} placeholder="旅行, 想法" /></label><label>可見性<select name="visibility" defaultValue="PUBLIC"><option value="PUBLIC">公開</option><option value="PROTECTED">受保護</option><option value="PRIVATE">私人</option></select></label><label>發佈來源<select name="sourceId" required value={sourceId} onChange={(event) => setSourceId(event.target.value)}>{sources.map((source) => <option key={source.id} value={source.id}>{source.name}</option>)}</select></label><label>圖片或附件（每檔最多 10 MB）<input name="attachments" type="file" multiple /></label>{error && <p className="error">{error}</p>}<button disabled={submitting}>{submitting ? "發佈中…" : "發佈並同步"}</button></form>;
}
