// pages — one script handling all page operations, dispatched by method+path.
// Demonstrates a single script bound to several routes (method/param varies).
//   GET    /cms/pages            -> public list (published)
//   GET    /cms/pages/:slug      -> public get by slug
//   GET    /cms/admin/pages      -> admin list (all)
//   POST   /cms/admin/pages      -> create (admin)
//   PUT    /cms/admin/pages/:id  -> update (admin)
//   DELETE /cms/admin/pages/:id  -> delete (admin)
import "auth" as auth;
import "util" as util;

let m = ctx.request.method;
let path = ctx.request.path;
let is_admin_path = path.contains("/cms/admin/");
let pages = docs::collection("pages");
let idx = kv::collection("slugs");

// ---- public reads ----
if !is_admin_path && m == "GET" && ctx.request.params.slug != () {
    let id = idx.get("page:" + ctx.request.params.slug);
    if id == () { return #{ statusCode: 404, body: #{ error: "not found" } }; }
    let doc = pages.get(id);
    if doc == () { return #{ statusCode: 404, body: #{ error: "not found" } }; }
    let p = util::shape_doc(doc);
    if p.status != "published" { return #{ statusCode: 404, body: #{ error: "not found" } }; }
    return #{ statusCode: 200, body: p };
}
if !is_admin_path && m == "GET" {
    let rows = pages.find(#{ status: "published", "$sort": #{ title: 1 }, "$limit": 100 });
    let out = [];
    for r in rows { let p = util::shape_doc(r); p.remove("body_md"); out.push(p); }
    return #{ statusCode: 200, body: #{ pages: out } };
}

// ---- everything else is admin ----
let g = auth::guard(ctx, ["admin"]);
if !g.ok { return g.response; }
let user = g.user;

if m == "GET" {
    let rows = pages.find(#{ "$sort": #{ updated_at: -1 }, "$limit": 100 });
    let out = [];
    for r in rows { let p = util::shape_doc(r); p.remove("body_md"); out.push(p); }
    return #{ statusCode: 200, body: #{ pages: out } };
}

if m == "POST" {
    let b = ctx.request.body;
    if b == () || b.title == () { return #{ statusCode: 400, body: #{ error: "title required" } }; }
    let slug = if b.slug == () { util::slugify(b.title) } else { util::slugify(b.slug) };
    if idx.has("page:" + slug) { slug = slug + "-" + random::string(4).to_lower(); }
    let data = #{
        title: b.title,
        slug: slug,
        body_md: if b.body_md == () { "" } else { b.body_md },
        status: if b.status == () { "draft" } else { b.status },
        author_id: user.id,
        author_name: user.display_name,
    };
    let id = pages.create(data);
    idx.set("page:" + slug, id);
    return #{ statusCode: 201, body: #{ id: id, slug: slug } };
}

if m == "PUT" {
    let id = ctx.request.params.id;
    let doc = pages.get(id);
    if doc == () { return #{ statusCode: 404, body: #{ error: "not found" } }; }
    let cur = doc.data;
    let b = ctx.request.body;
    if b.title != () { cur.title = b.title; }
    if b.body_md != () { cur.body_md = b.body_md; }
    if b.status != () { cur.status = b.status; }
    if b.slug != () {
        let ns = util::slugify(b.slug);
        if ns != cur.slug {
            idx.delete("page:" + cur.slug);
            if idx.has("page:" + ns) { ns = ns + "-" + random::string(4).to_lower(); }
            idx.set("page:" + ns, id);
            cur.slug = ns;
        }
    }
    pages.update(id, cur);
    return #{ statusCode: 200, body: #{ id: id, slug: cur.slug } };
}

if m == "DELETE" {
    let id = ctx.request.params.id;
    let doc = pages.get(id);
    if doc == () { return #{ statusCode: 404, body: #{ error: "not found" } }; }
    pages.delete(id);
    idx.delete("page:" + doc.data.slug);
    return #{ statusCode: 200, body: #{ ok: true } };
}

#{ statusCode: 405, body: #{ error: "method not allowed" } }