/* Minimal blog-posts.js
	 - Stores posts in localStorage under `blogPosts`
	 - Posts: {id, title, content, image, journeyId, created_at}
	 - Supports create, edit, delete, view
*/

const STORAGE_KEY = 'blogPosts';

function loadPosts() {
	try {
		return JSON.parse(localStorage.getItem(STORAGE_KEY) || '[]');
	} catch (e) {
		console.error('Failed to parse posts', e);
		return [];
	}
}

function savePosts(posts) {
	localStorage.setItem(STORAGE_KEY, JSON.stringify(posts));
}

function getNextId(posts) {
	if (!posts || posts.length === 0) return 1;
	return Math.max(...posts.map(p => p.id)) + 1;
}

function renderPostList() {
	const posts = loadPosts().sort((a,b)=> new Date(b.created_at) - new Date(a.created_at));
	const container = document.getElementById('posts-list');
	container.innerHTML = '';

	if (posts.length === 0) {
		container.innerHTML = '<p class="empty-message">No posts yet.</p>';
		return;
	}

	posts.forEach(post => {
		const el = document.createElement('div');
		el.className = 'marker-item';
		el.innerHTML = `
			<div style="display:flex;justify-content:space-between;align-items:center;gap:8px;">
				<div style="flex:1">
					<strong>${escapeHtml(post.title)}</strong>
					<div style="font-size:.85rem;color:#7f8c8d">${new Date(post.created_at).toLocaleString()}${post.journeyId ? ' • Journey '+post.journeyId : ''}</div>
				</div>
				<div style="display:flex;gap:6px">
					<button class="btn btn-small" data-action="view" data-id="${post.id}">View</button>
					<button class="btn btn-small" data-action="edit" data-id="${post.id}">Edit</button>
					<button class="btn btn-small btn-danger" data-action="delete" data-id="${post.id}">Delete</button>
				</div>
			</div>
		`;
		container.appendChild(el);
	});
}

function escapeHtml(s){
	return String(s || '').replace(/[&<>"']/g, (m)=>({
		'&':'&amp;','<':'&lt;','>':'&gt;','"':'&quot;',"'":'&#39;'
	}[m]));
}

function showPost(id) {
	const posts = loadPosts();
	const post = posts.find(p=>p.id===id);
	if (!post) return;

	const titleEl = document.querySelector('.post-title');
	const metaEl = document.querySelector('.post-meta');
	const imgEl = document.querySelector('.post-hero img');
	const contentEl = document.querySelector('.post-content');

	titleEl.textContent = post.title;
	metaEl.innerHTML = `By <span class="author">Author</span> — <time datetime="${post.created_at}">${new Date(post.created_at).toLocaleString()}</time>`;
	if (post.image) imgEl.src = post.image; else imgEl.src = 'https://via.placeholder.com/800x350?text=Hero+Image';
	contentEl.innerHTML = post.content;
}

function openForm(mode='create', post=null) {
	const formWrap = document.getElementById('post-form');
	formWrap.style.display = 'block';
	document.getElementById('form-title').textContent = mode === 'create' ? 'New Post' : 'Edit Post';
	const form = document.getElementById('blog-form');
	form.dataset.mode = mode;
	form.dataset.id = post ? post.id : '';
	document.getElementById('post-title-input').value = post ? post.title : '';
	document.getElementById('post-journey-input').value = post ? (post.journeyId || '') : '';
	document.getElementById('post-image-input').value = post ? (post.image || '') : '';
	document.getElementById('post-content-input').value = post ? post.content : '';
}

function closeForm() {
	const formWrap = document.getElementById('post-form');
	formWrap.style.display = 'none';
	const form = document.getElementById('blog-form');
	form.removeAttribute('data-id');
}

function deletePost(id) {
	if (!confirm('Delete this post?')) return;
	let posts = loadPosts();
	posts = posts.filter(p=>p.id!==id);
	savePosts(posts);
	renderPostList();
	// if the shown post was deleted, clear article
	const currentTitle = document.querySelector('.post-title').textContent;
	if (!posts.find(p=>p.title===currentTitle)) {
		document.querySelector('.post-title').textContent = 'Post Title';
		document.querySelector('.post-content').innerHTML = '<p>No post selected.</p>';
	}
}

document.addEventListener('DOMContentLoaded', ()=>{
	renderPostList();

	document.getElementById('create-post-btn').addEventListener('click', ()=> openForm('create'));

	document.getElementById('cancel-post-btn').addEventListener('click', (e)=>{ e.preventDefault(); closeForm(); });

	document.getElementById('posts-list').addEventListener('click', (e)=>{
		const btn = e.target.closest('button[data-action]');
		if (!btn) return;
		const id = parseInt(btn.dataset.id,10);
		const action = btn.dataset.action;
		if (action === 'view') showPost(id);
		if (action === 'edit') {
			const posts = loadPosts();
			const post = posts.find(p=>p.id===id);
			openForm('edit', post);
		}
		if (action === 'delete') deletePost(id);
	});

	document.getElementById('blog-form').addEventListener('submit', (e)=>{
		e.preventDefault();
		const form = e.target;
		const mode = form.dataset.mode || 'create';
		const id = parseInt(form.dataset.id,10) || null;
		const title = document.getElementById('post-title-input').value.trim();
		const journeyId = document.getElementById('post-journey-input').value.trim() || null;
		const image = document.getElementById('post-image-input').value.trim() || '';
		const content = document.getElementById('post-content-input').value.trim();

		let posts = loadPosts();
		if (mode === 'create') {
			const newPost = {
				id: getNextId(posts),
				title,
				content,
				image,
				journeyId: journeyId || null,
				created_at: new Date().toISOString()
			};
			posts.push(newPost);
			savePosts(posts);
			renderPostList();
			showPost(newPost.id);
		} else if (mode === 'edit' && id) {
			const idx = posts.findIndex(p=>p.id===id);
			if (idx !== -1) {
				posts[idx].title = title;
				posts[idx].content = content;
				posts[idx].image = image;
				posts[idx].journeyId = journeyId || null;
				savePosts(posts);
				renderPostList();
				showPost(id);
			}
		}

		closeForm();
	});
});