(ns advent.utils
  (:refer-clojure :exclude [load])
  (:require [play-clj.core :refer :all]
            [play-clj.ui :refer :all]
            [play-clj.utils :refer :all]
            [play-clj.math :refer :all]
            [play-clj.g2d :refer :all]
            [clojure.edn :as edn])
  (:import [com.badlogic.gdx.graphics Pixmap Pixmap$Filter Texture Texture$TextureFilter]
           [com.badlogic.gdx.graphics.g2d TextureRegion]
           [java.lang Object]))

(defn log-coords [screen entities]
  (let [{:keys [x y]} (input->screen screen {:x (:input-x screen) :y (:input-y screen)})]
    (println (:input-x screen) (:input-y screen) "->" x y)))

(def +all-cursors+ [:main :wool :mushrooms :carrot :right :down :left :up :flask :flask-with-contents :trophy :ladder :stick :cat-toy :balloon :frog-legs :teddy :portrait :recipe :glass-eye :motivational-tapes :used-earplugs :grass :slobber :flask-with-strength :medal :kiss :sword :hourglass :mandrake :ball-n-chain :key :rope :crowbar :note-1 :ash :sack-lunch :flies :spear :monocle :feather :spell-component])

(defn cursor [filename which]
  (let [scale 2
        base-cursor (pixmap filename)
        target-width (* 16 scale)
        target-height (* 16 scale)
        resized (Pixmap. target-width target-height (.getFormat base-cursor))
        index (.indexOf +all-cursors+ which)]
    (Pixmap/setFilter Pixmap$Filter/NearestNeighbour)
    (pixmap! resized :draw-pixmap base-cursor (* index 16) 0 16 16
             0 0 target-width target-height)
    resized ))

(defn save [entities]
  (spit "save.edn" (entities :state)))

(defn load []
  (assoc (edn/read-string (slurp "save.edn")) :active? true))

(defn get-font [filename]
  (let [font (bitmap-font filename) 
        tr (bitmap-font! font :get-region)
        tx (.getTexture tr)]
    (texture! tx :set-filter Texture$TextureFilter/Linear Texture$TextureFilter/Linear)
    font))

(def +screen-width+ 320)
(def +screen-height+ 240)

(defn scaler-fn-with-baseline [baseline minimum-size & [maximum-size]]
  (let [maximum-size (or maximum-size 1.0)]
    (fn [[_ y]]
      (if (< y baseline) maximum-size
          (let [percent-complete (- 1.0 (/ (- y baseline) (- +screen-height+ baseline)))
                range (+ (* percent-complete (- maximum-size minimum-size)) minimum-size)]
            range)))))

(defn scaler-fn-from-image [image minimum-size maximum-size]
  (let [image (pixmap image)
        maximum-size (or maximum-size 1.0)]
    (fn [[x y]]
      (let [percent-complete (-> image
                                 (pixmap! :get-pixel x (- 240 y))
                                 color
                                 (.r))]
        (+ (* percent-complete (- maximum-size minimum-size)) minimum-size)))))

(defn dist [x1 y1 x2 y2]
  (let [dx (- x1 x2)
        dy (- y1 y2)]
    (Math/sqrt (+ (* dx dx) (* dy dy)))))


(defn flip [anim]
  (animation (animation! anim :get-frame-duration)
             (for [src-frame (animation! anim :get-key-frames)
                   :let [frame (texture (texture! src-frame :get-texture))]]
               (do
                 (texture! frame :set-region src-frame)
                 (texture! frame :flip true false)
                 frame))))

(defn make-anim [file [w h] speed frames]
  (let [sheet (texture! (texture file) :split w h)]
    (animation speed (for [i frames]
                                       (aget sheet 0 i)))))
(defn make-bird [screen p]
  (let [bird-sheet (texture! (texture "outside-castle/bird.png") :split 1 2)
        bird-stand (animation 0.15 (for [i [0 1]]
                                    (aget bird-sheet 0 i)))]
    (assoc (animation->texture screen bird-stand)
      :x 0
      :y 0
      :baseline 21
      :anim bird-stand
      :anim-start 0
      :path (catmull-rom-spline (map #(apply vector-2* %)  p) true)
      :update-fn (fn [screen entities entity]
                   (let [speed 0.05
                         pos-f (- (* (:total-time screen) speed) (int (* (:total-time screen) speed)))
                         v (vector-2 0 0)
                         a (catmull-rom-spline! (:path entity) :value-at v pos-f)]
                     (assoc entity :x (vector-2! v :x) :y (vector-2! v :y)))))))

(defn find-override [entities [x y]]
  (first (filter #(and ((:mouse-in? %) entities x y)
                       (:cursor %))
                 (get-in entities [:room :interactions]))))

(defn update-override [entities]
  (if (get-in entities [:state :active?])
    (let [last-pos (get-in entities [:cursor :last-pos])]
      (if-let [mouse-override (find-override entities last-pos)]
        (assoc-in entities [:cursor :override] (:cursor mouse-override))
        (assoc-in entities [:cursor :override] nil)))
    entities))

(defn remove-interaction [entities id]
  (update-in entities [:room :interactions] (fn [i] (remove #(= id (:id %)) i))))