(ns microtables-frontend.events
  (:require
   [re-frame.core :as re-frame]
   [microtables-frontend.db :as db]
   [microtables-frontend.utils :as utils]))




(re-frame/reg-event-db
 ::initialize-db
 (fn [_ _]
   (println "initializing db")
   (-> db/default-db
       (update-in [:table-data] (partial map utils/add-parsed-variables))
       (update-in [:table-data] utils/re-evaluate)
       (update-in [:alt-table-data] #(utils/walk-modify-data % (fn [c r datum] (if (= (first (:value datum)) "=") (assoc datum :dirty true) datum))))
       (update-in [:alt-table-data] utils/create-all-references)
       (update-in [:alt-table-data] utils/create-all-back-references)
       (update-in [:alt-table-data] utils/evaluate-all))))


(re-frame/reg-event-db
  ::movement-enter-cell
  (fn [db [_ c r]]
    (println "::movement-enter-cell" c r)
    (assoc-in db [:position :cursor] {:col c :row r})))


(defn re-evaluate-if-dirty [db dirty]
  (if dirty
    (update-in db [:table-data] utils/re-evaluate)
    db))

(re-frame/reg-event-db
  ::movement-leave-cell
  (fn [db [_ c r]]
    (let [datum (utils/get-datum (:table-data db) c r)
          alt-datum (get-in (:alt-table-data db) [c r])]
      (println "::movement-leave-cell" c r (if (:dirty datum) "- dirty" ""))
      (-> db
          (assoc-in [:position :cursor] nil)
          (assoc-in [:position :selection] nil)
          (update-in [:table-data] (partial utils/add-parsed-variables-to-specific-datum c r))
          ;(update-in [:alt-table-data c r] utils/add-references)
          (update-in [:alt-table-data] #(utils/reset-references % c r))
          (update-in [:alt-table-data] #(utils/evaluate-from-cell % c r))
          (re-evaluate-if-dirty (:dirty datum))))))


(re-frame/reg-event-db
  ::edit-cell-value
  (fn [db [_ c r existing-datum value]]
    (println "::edit-cell-value" c r value)
    (if (nil? existing-datum);TODO: when removing list-based data, remove this conditional, and all references to "existing-datum" (not needed in map-based data)
      (-> db
          (assoc :table-data (conj (:table-data db) {:row r :col c :value value :dirty true}))
          (update-in [:alt-table-data] #(utils/change-datum-value % c r value)))
      (-> db
          (assoc :table-data (map #(if (and (= r (:row %)) (= c (:col %))) (assoc (assoc % :dirty true) :value value) %) (:table-data db)))
          (update-in [:alt-table-data] #(utils/change-datum-value % c r value))))))