(ns advent.screens.dialogue
  (:require [play-clj.core :refer :all]
            [play-clj.ui :refer :all]
            [play-clj.utils :refer :all]
            [play-clj.g2d :refer :all]
            [clojure.pprint]
            [advent.pathfind]
            [clojure.core.async :refer [put! <! <!! >! >!! chan go thread take! alts!!]]
            #_[advent.screens.scene :as scene])
  (:import [com.badlogic.gdx.graphics Pixmap Pixmap$Filter Texture Texture$TextureFilter]
           [com.badlogic.gdx.graphics.g2d TextureRegion]
           [com.badlogic.gdx.scenes.scene2d.utils Align]
           [com.badlogic.gdx Screen]))

(defn ensure-on-screen [talk]
  (let [margin-width (* 0.05 (game :width))
        minimum-x margin-width
        maximum-x (- (game :width) margin-width)
        label-width (label! talk :get-width)
        label-right (+ (:x talk) label-width)]
    (cond (> label-right maximum-x) (assoc talk :x (- maximum-x label-width))
          (< (:x talk) minimum-x) (assoc talk :x minimum-x)
          :else talk)))

(defscreen talking-screen
  :on-show
  (fn [screen entities]
    (update! screen :renderer (stage) :camera (orthographic))
    {})
  :on-render
  (fn [screen [entities]]
    (render! screen (vals entities))
    entities)

  :on-talk
  (fn [{:keys [create-talk target-id color text x y scale]} [entities]]
    (let [font (bitmap-font "ego/font.fnt" ) 
          _ (bitmap-font! font :set-markup-enabled true)
          tr (bitmap-font! font :get-region)
          scale (or (min (max scale 0.75) 1) 1)
          tx (.getTexture tr)
          _ (texture! tx :set-filter Texture$TextureFilter/Linear Texture$TextureFilter/Linear)
          talk (assoc (label text (style :label font color)) :y (* 4 y))]
      (label! talk :set-font-scale scale)
      (label! talk :set-alignment Align/center)
      (assoc entities target-id (-> talk
                                    (assoc :x (- (* 4 x) (/ (label! talk :get-width) 2)))
                                    ensure-on-screen ))))

  :stop-talk
  (fn [{:keys [target-id] } [entities]]
    (dissoc entities target-id))

  
  :on-resize (fn [screen entities]
               (size! screen 1280 960)))

(def choice-height 30)


(defn intersects? [e [x y]]
  (and (:object e)
       (< (:x e) x (+ (:x e) (.getWidth (:object e))))
       (< (:y e) y (+ (:y e) (:height e)))))

(defscreen choice-screen
  :on-show
  (fn [screen entities]
    (update! screen :renderer (stage) :camera (orthographic))
    {})

  :on-render
  (fn [screen [entities]]
    (render! screen (vals entities))
    entities)

  :on-present-choices
  (fn [{:keys [choices callback]} [entities]]
    (let [font (bitmap-font "ego/font.fnt" ) 
          tr (bitmap-font! font :get-region)
          scale 1 
          tx (.getTexture tr)
          _ (texture! tx :set-filter Texture$TextureFilter/Linear Texture$TextureFilter/Linear)
          choice-count (count choices)]
      (-> entities
          (into (for [[[text] i] (map vector choices (range))]
                  [i (assoc (label text (style :label font (color :white))) :height 30 :x 30 :y (+ 30 (* choice-height (- choice-count i 1))) :index i)]))
          (assoc :state {:object nil :callback callback :choices choices :font font}))))

  :on-touch-up (fn [screen [entities]]
                   (let [{:keys [x y]} (input->screen screen {:x (:input-x screen) :y (:input-y screen)})]
                     (when (seq entities)
                       (when-let [choice (first (filter #(intersects? % [x y]) (vals entities)))] 
                         ((get-in entities [:state :callback]) (:index choice)) 
                         {}))))

  :on-mouse-moved (fn [screen [entities]]
                    (when (seq entities)
                      (let [{:keys [x y]} (input->screen screen {:x (:input-x screen) :y (:input-y screen)}) 
                            choice-count (dec (count  entities))]
                        (doseq [e (vals entities)
                                :when (:object e)]
                          (if (intersects? e [x y])
                            (label! e :set-style (style :label (get-in entities [:state :font]) (color :yellow)))
                            (label! e :set-style (style :label (get-in entities [:state :font]) (color :white))))))))
  
  :on-resize (fn [screen entities]
               (size! screen 1280 960)))