// PUT /cms/admin/posts/:id — update a post (author+ ; own-only unless admin).
import "auth" as auth;
import "util" as util;
let g = auth::guard(ctx, ["admin", "author"]);
if !g.ok { return g.response; }
let user = g.user;

let id = ctx.request.params.id;
let posts = docs::collection("posts");
let doc = posts.get(id);
if doc == () { return #{ statusCode: 404, body: #{ error: "not found" } }; }
let cur = doc.data;

// IDOR guard: an author may edit only their OWN post; an admin edits any.
let is_admin = users::has_role(user.id, "admin");
if !is_admin && cur.author_id != user.id {
    return #{ statusCode: 403, body: #{ error: "not your post" } };
}

let b = ctx.request.body;
if b.title != () { cur.title = b.title; }
if b.body_md != () { cur.body_md = b.body_md; }
if b.excerpt != () { cur.excerpt = b.excerpt; }
if b.tags != () { cur.tags = b.tags; }

let idx = kv::collection("slugs");
if b.slug != () {
    let newslug = util::slugify(b.slug);
    if newslug != cur.slug {
        idx.delete("post:" + cur.slug);
        if idx.has("post:" + newslug) { newslug = newslug + "-" + random::string(4).to_lower(); }
        idx.set("post:" + newslug, id);
        cur.slug = newslug;
    }
}

if b.status != () && b.status != cur.status {
    cur.status = b.status;
    if b.status == "published" && cur.publish_at == () { cur.publish_at = time::now(); }
    if b.status == "scheduled" && b.publish_at != () { cur.publish_at = b.publish_at; }
}

posts.update(id, cur);
#{ statusCode: 200, body: #{ id: id, slug: cur.slug, status: cur.status } }