# an integrated Ludus interpreter
(try (os/cd "janet") ([_] nil)) # for REPL
(import /scanner :as s)
(import /parser :as p)
(import /validate :as v)
(import /interpreter :as i)
(import /errors :as e)
(import /base :as b)
(import /load-prelude :as prelude)
(import spork/json :as j)

(comment
The API from the old Clojure Ludus interpreter returns an object with four fields:
 * `console`: an array of lines to be printed to the console
 * `result`: a string representation of the result of running the script
 * `draw`: an array of arrays that represent p5 calls, e.g. `["line", 0, 0, 100, 100]`
 * `errors`: an array of errors, which are just strings

This new scene will have to return a JSON POJSO:
{:console "..." :result "..." :draw [...] :errors [...]}
)

(defn run [source]
 (when (= :error prelude/pkg) (error "could not load prelude"))
 (def ctx @{:^parent prelude/ctx})
 (def errors @[])
 (def draw @[])
 (var result @"")
 (def console @"")
 (def out @{:errors errors :draw draw :result result :console console})
 (def scanned (s/scan source))
 (when (any? (scanned :errors))
  (break (do
   (each err (scanned :errors)
    (e/scan-error err)))))
 (def parsed (p/parse scanned))
 (when (any? (parsed :errors))
  (break (each err (parsed :errors)
   (e/parse-error err))))
 (def validated (v/valid parsed ctx))
 (when (any? (validated :errors))
  (break (each err (validated :errors)
   (e/validation-error err))))
 # (setdyn :out console)
 (try
  (set result (i/interpret (parsed :ast) ctx))
  ([err] (comment setdyn :out stdout) (e/runtime-error err)))
 # (setdyn :out stdout)
 (set (out :result) result)
 result)

(do
(def source `
forward! (100)
p5_calls
`)

(-> source run)
)

(comment
Next up:
* postlude!
* testing turtle graphics
)