;; This Source Code Form is subject to the terms of the Mozilla Public
;; License, v. 2.0. If a copy of the MPL was not distributed with this
;; file, You can obtain one at http://mozilla.org/MPL/2.0/.
;;
;; Copyright (c) KALEIDOS SUBSIDIARY SL

;; Discovery loads each scene and its transitive requires, including any
;; colocated operation functions. Stripping :run! only makes output plain
;; data; it cannot isolate browser dependencies. Keep this entire import
;; graph safe for Node. Browser adapters will supply execution capabilities in
;; rtx; discovery must never invoke operation bodies. Collection with a
;; real body present is proven by `contracts-scene/case`, not by the
;; metadata-only rects cases.

(ns benches.render-wasm.cases
  "Case collection for the renderer benchmarks.

  Loading this namespace registers the scene namespaces listed here. The require
  list is the discovery manifest for case collection.

  NOTE: Nothing here should import browser or renderer code, so the Node runner
  and offline reports load scenes without requiring a browser.

  Usage:

    (cases/collect-cases {:master-seed 42})
    ;; =>
    [{:id :rects/load
      :scene :rects
      :scene-description \"Seeded rectangles with translucent fills and centered strokes\"
      :scene-seed 2602546180
      :params {:count 1000 :width 1920 :height 1080 :min-size 20 :max-size 100}
      :view {:scale 1 :x 0 :y 0}
      :context :fresh
      :completion :render-full
      :batch-size 1
      :preparation {}}
     {:id :rects/pan ...}
     {:id :rects/zoom ...}]"
  (:require
   [app.common.schema :as sm]
   [benches.render-wasm.declarations :as decl]
   [benches.render-wasm.random :as random]
   benches.render-wasm.scenes.masks
   benches.render-wasm.scenes.paths
   benches.render-wasm.scenes.plus
   benches.render-wasm.scenes.rects
   [clojure.string :as str]))

(defn- check-master-seed!
  "Collection requires an integer master seed in [0, 2^32)."
  [seed]
  (when-not (random/seed? seed)
    (throw (ex-info "case collection requires an integer master seed in [0, 2^32)"
                    {:type ::invalid-master-seed
                     :seed seed}))))

(defn- as-invalid-case!
  "Runs `thunk`, translating core case-validation failures into this
  namespace's ::invalid-case so `collect-cases` has a single error
  contract. Registry mechanics (::duplicate-*, ::unknown-scene) and scene
  declarations (::invalid-scene) keep their own types."
  [thunk]
  (try
    (thunk)
    (catch :default cause
      (let [data (ex-data cause)]
        (if (contains? #{::decl/invalid-case ::decl/non-serializable-case} (:type data))
          (throw (ex-info (ex-message cause)
                          (assoc data :type ::invalid-case)
                          cause))
          (throw cause))))))

(defn- check-params!
  "Validates case params against the scene's closed schema."
  [case-id scene-id schema params]
  (when-not (sm/validate schema params)
    (throw (ex-info (str "invalid params for case " case-id)
                    {:type ::invalid-case
                     :id case-id
                     :scene scene-id
                     ::sm/explain (sm/explain schema params)}))))

(defn- validate-case!
  "Validates a registered case entry against its scene: unknown scene,
  case-namespace mismatch, declaration schema and closed params."
  [{:keys [id scene params] :as registered} scene-by-id]
  (let [entry (get scene-by-id scene)]
    (when (nil? entry)
      (throw (ex-info (str "case " id " names an unknown scene: " scene)
                      {:type ::unknown-scene
                       :id id
                       :scene scene})))
    (when-not (= (name scene) (namespace id))
      (throw (ex-info (str "case id " id " is not namespaced by its scene: " scene)
                      {:type ::invalid-case
                       :id id
                       :scene scene})))
    (as-invalid-case! #(decl/check-registered-case! registered))
    (check-params! id scene (:params-schema entry) params)
    registered))

(defn- describe-case
  "Projects a validated case to its collected descriptor: scene description
  and seed attached, internal keys stripped, transit wire checked."
  [master-seed registered scene-entry]
  (let [projected (-> (decl/project-case registered)
                      (assoc :scene-description (:description scene-entry)
                             :scene-seed (decl/derive-seed master-seed
                                                           (:scene registered)
                                                           (:params registered))))]
    (as-invalid-case! #(decl/check-collected-case projected))))

(defn collect-cases
  "Selected benchmark cases as plain data.

  Validates scenes, cases and parameters before any browser work. `:filter`
  is a substring match on the case id; an empty selection throws ::no-cases."
  [{:keys [master-seed] :as options}]
  (check-master-seed! master-seed)
  (let [pattern       (:filter options)
        scene-by-id   (into {} (map (juxt :id identity)) (decl/scenes))]
    (doseq [scene (decl/scenes)]
      (decl/check-registered-scene! scene))
    (let [selected (->> (decl/cases)
                        (map #(validate-case! % scene-by-id))
                        (filter (fn [registered]
                                  (or (str/blank? pattern)
                                      (str/includes? (str (:id registered)) pattern))))
                        (mapv #(describe-case master-seed % (get scene-by-id (:scene %)))))]
      (when (empty? selected)
        (throw (ex-info "no benchmark cases match the selection"
                        {:type ::no-cases
                         :filter pattern})))
      selected)))