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(ns lux.analyser.lux
  (:require (clojure [template :refer [do-template]])
            [clojure.core.match :as M :refer [match matchv]]
            clojure.core.match.array
            (lux [base :as & :refer [exec return fail
                                     |list
                                     if-m try-all-m |map% |flat-map% |fold% map-m mapcat-m reduce-m
                                     assert!]]
                 [parser :as &parser]
                 [type :as &type]
                 [macro :as &macro]
                 [host :as &host])
            (lux.analyser [base :as &&]
                          [lambda :as &&lambda]
                          [case :as &&case]
                          [env :as &&env]
                          [def :as &&def])))

;; [Resources]
(defn analyse-tuple [analyse ?elems]
  (exec [=elems (|flat-map% analyse ?elems)
         =elems-types (|map% &&/expr-type =elems)
         ;; :let [_ (prn 'analyse-tuple =elems)]
         ]
    (return (|list [::&&/Expression [::&&/tuple =elems] (&/V "Tuple" (&/|->list =elems-types))]))))

(defn analyse-record [analyse ?elems]
  (exec [=elems (|map% (fn [kv]
                         (matchv ::M/objects [kv]
                           [[k v]]
                           (exec [=v (&&/analyse-1 analyse v)]
                             (return (to-array [k =v])))))
                       ?elems)
         =elems-types (|map% (fn [kv]
                               (matchv ::M/objects [kv]
                                 [[k v]]
                                 (exec [=v (&&/expr-type v)]
                                   (return (to-array [k =v])))))
                             =elems)
         ;; :let [_ (prn 'analyse-tuple =elems)]
         ]
    (return (|list [::&&/Expression [::&&/record =elems] (&/V "Record" (&/|->list =elems-types))]))))

(defn analyse-ident [analyse ident]
  (exec [module-name &/get-module-name]
    (fn [state]
      (let [[top & stack*] (::&/local-envs state)]
        (if-let [=bound (or (get-in top [:locals  :mappings ident])
                            (get-in top [:closure :mappings ident]))]
          [::&/ok [state (|list =bound)]]
          (let [no-binding? #(and (-> % :locals  :mappings (contains? ident) not)
                                  (-> % :closure :mappings (contains? ident) not))
                [inner outer] (split-with no-binding? stack*)]
            (if (empty? outer)
              (if-let [global (get-in state [::&/global-env ident])]
                [::&/ok [state (|list global)]]
                [::&/failure (str "[Analyser Error] Unresolved identifier: " ident)])
              (let [in-stack (cons top inner)
                    scopes (rest (reductions #(cons (:name %2) %1) (map :name outer) (reverse in-stack)))
                    _ (prn 'in-stack module-name ident (map :name in-stack) scopes)
                    [=local inner*] (reduce (fn [[register new-inner] [frame in-scope]]
                                              (let [[register* frame*] (&&lambda/close-over (cons module-name (reverse in-scope)) ident register frame)]
                                                [register* (cons frame* new-inner)]))
                                            [(or (get-in (first outer) [:locals  :mappings ident])
                                                 (get-in (first outer) [:closure :mappings ident]))
                                             '()]
                                            (map vector (reverse in-stack) scopes)
                                            )]
                [::&/ok [(assoc state ::&/local-envs (concat inner* outer)) (|list =local)]])
              ))
          ))
      )))

(defn ^:private analyse-apply* [analyse =fn ?args]
  (exec [=args (|flat-map% analyse ?args)
         =fn-type (&&/expr-type =fn)
         :let [[=apply =apply-type] (|fold% (fn [[=fn =fn-type] =input]
                                              (exec [=input-type (&&/expr-type =input)
                                                     =output-type (&type/apply-lambda =fn-type =input-type)]
                                                [[::&&/apply =fn =input] =output-type]))
                                            [=fn =fn-type]
                                            =args)]]
    (return (|list [::&&/Expression =apply =apply-type]))))

(defn analyse-apply [analyse =fn ?args]
  (exec [loader &/loader]
    (match =fn
      [::&&/Expression =fn-form =fn-type]
      (match =fn-form
        [::&&/global ?module ?name]
        (exec [macro? (&&def/macro? ?module ?name)]
          (if macro?
            (let [macro-class (&host/location (list ?module ?name))]
              (exec [macro-expansion (&macro/expand loader macro-class ?args)]
                (return (&/->seq (|flat-map% analyse macro-expansion)))))
            (analyse-apply* analyse =fn ?args)))
        
        _
        (analyse-apply* analyse =fn ?args))

      :else
      (fail "[Analyser Error] Can't call a statement!"))
    ))

(defn analyse-case [analyse ?value ?branches]
  ;; (prn 'analyse-case ?value ?branches)
  (exec [:let [num-branches (count ?branches)]
         _ (assert! (and (> num-branches 0) (even? num-branches))
                    "[Analyser Error] Unbalanced branches in \"case'\" expression.")
         :let [branches (partition 2 ?branches)
               locals-per-branch (map (comp &&case/locals first) branches)
               max-locals (reduce max 0 (map count locals-per-branch))]
         ;; :let [_ (prn '[branches locals-per-branch max-locals] [branches locals-per-branch max-locals])]
         base-register &&env/next-local-idx
         ;; :let [_ (prn 'base-register base-register)]
         =value (&&/analyse-1 analyse ?value)
         ;; :let [_ (prn '=value =value)]
         =bodies (map-m (partial &&case/analyse-branch analyse max-locals)
                        (map vector locals-per-branch (map second branches)))
         ;; :let [_ (prn '=bodies =bodies)]
         ;; :let [_ (prn 'analyse-case/=bodies =bodies)]
         =body-types (map-m &&/expr-type =bodies)
         =case-type (reduce-m &type/merge (&/V "Nothing" nil) =body-types)
         :let [=branches (map vector (map first branches) =bodies)]]
    (return (|list [::&&/Expression [::&&/case =value base-register max-locals =branches] =case-type]))))

(defn analyse-lambda [analyse ?self ?arg ?body]
  (exec [=lambda-type* &type/fresh-lambda]
    (matchv ::M/objects [=lambda-type*]
      [["Lambda" [=arg =return]]]
      (exec [[=scope =captured =body] (&&lambda/with-lambda ?self =lambda-type*
                                        ?arg =arg
                                        (&&/analyse-1 analyse ?body))
             =body-type (&&/expr-type =body)
             =lambda-type (exec [_ (&type/solve =return =body-type)
                                 =lambda-type** (&type/clean =return =lambda-type*)]
                            (&type/clean =arg =lambda-type**))]
        (return (|list [::&&/Expression [::&&/lambda =scope =captured ?arg =body] =lambda-type]))))))

(defn analyse-get [analyse ?slot ?record]
  (exec [=record (&&/analyse-1 analyse ?record)
         =record-type (&&/expr-type =record)
         =slot-type (&type/slot-type =record-type ?slot)]
    (return (|list [::&&/Expression [::&&/get ?slot =record] =slot-type]))))

(defn analyse-set [analyse ?slot ?value ?record]
  (exec [=value (&&/analyse-1 analyse ?value)
         =record (&&/analyse-1 analyse ?record)
         =record-type (&&/expr-type =record)
         =slot-type (&type/slot-type =record-type ?slot)
         _ (&type/solve =slot-type =value)]
    (return (|list [::&&/Expression [::&&/set ?slot =value =record] =slot-type]))))

(defn analyse-def [analyse ?name ?value]
  ;; (prn 'analyse-def ?name ?value)
  (exec [module-name &/get-module-name]
    (if-m (&&def/defined? module-name ?name)
          (fail (str "[Analyser Error] Can't redefine " ?name))
          (exec [=value (&&/analyse-1 analyse ?value)
                 =value-type (&&/expr-type =value)
                 _ (&&def/define module-name ?name =value-type)]
            (return (|list [::&&/Statement [::&&/def ?name =value]]))))))

(defn analyse-declare-macro [?ident]
  (exec [module-name &/get-module-name
         _ (&&def/declare-macro module-name ?ident)]
    (return (|list))))

(defn analyse-import [analyse ?path]
  (assert false)
  (return (|list)))

(defn analyse-check [analyse eval! ?type ?value]
  (exec [=type (&&/analyse-1 analyse ?type)
         =type-type (&&/expr-type =type)
         _ (&type/solve &type/+type+ =type-type)
         ==type (eval! =type)
         =value (&&/analyse-1 analyse ?value)]
    (match =value
      [::&&/Expression ?expr ?expr-type]
      (exec [_ (&type/solve ==type ?expr-type)]
        (return [::&&/Expression ?expr ==type])))))

(defn analyse-coerce [analyse eval! ?type ?value]
  (exec [=type (&&/analyse-1 analyse ?type)
         =type-type (&&/expr-type =type)
         _ (&type/solve &type/+type+ =type-type)
         ==type (eval! =type)
         =value (&&/analyse-1 analyse ?value)]
    (match =value
      [::&&/Expression ?expr ?expr-type]
      (return [::&&/Expression ?expr ==type]))))