(local GraphicsEditView (require :editor.gfxedit))
(local style (require :core.style))
(local tiles (require :game.tiles))
(local files (require :game.files))
(local util (require :lib.util))
(local {: mouse-inside : activate : active? : checkbox : textfield : button} (util.require :editor.imstate))

(local TileView (GraphicsEditView:extend))

(set TileView.pixel-size 24)
(local pixel-size TileView.pixel-size)

(fn TileView.tilesize [self] (values 16 16))
(fn TileView.tilekeys [self]
  (if files.game.tilesets (icollect [_ key (pairs files.game.tilesets)] key)
    [:gfx]))
(fn TileView.tilebytelen [self] (let [(w h) (self:tilesize)] (/ (* w h) (self:pixel-storage-divisor))))

(fn get-byte [tile ibyte]
  (or (: (tile:sub (+ ibyte 1) (+ ibyte 1)) :byte) 0))
(fn get-bits [tile ibyte ibit mask]
  (-> (get-byte tile ibyte)
      (bit.band (bit.lshift mask ibit))
      (bit.rshift ibit)))
(fn set-bits [tile ibyte ibit mask bits]
  (local orval (bit.lshift mask ibit))
  (-> (get-byte tile ibyte)
    (bit.band (bit.bnot orval))
    (bit.bor (bit.lshift bits ibit))))

(fn set-tile-bits [tile ibyte ibit mask bits]
  (util.splice tile ibyte (string.char (set-bits tile ibyte ibit mask bits))))

(files.platform-methods TileView :editor.tileedit :map-bitxy :pixel-color :draw-on :draw-off :draw-bits
  :palette :pixel-storage-divisor)

(files.default-platform-method TileView :editor.tileedit :preview-locations
  (fn [self] (let [(w h) (self:tilesize)] [[0 0] [w 0] [0 h] [w h]])))

(fn TileView.tile [self]
  (local (w h) (self:tilesize))
  (or (-?> self.tilecache.tiles (. self.itile) (. (or self.tilekey :gfx)))
      (string.rep "\0" (/ (* w h) (self:pixel-storage-divisor)))))

(fn TileView.draw-pixel [self x y colorbg ?colorfg]
  (renderer.draw_rect x y pixel-size pixel-size colorbg)
  (when ?colorfg (renderer.draw_rect (+ x 3) (+ y 3) (- pixel-size 6) (- pixel-size 6) ?colorfg)))

(fn TileView.draw-tile-editor [self tile x y]
  (when (not (active? self :tile)) (self:draw-off))
  (local (w h) (self:tilesize))
  (local editor-w (* (+ pixel-size 1) w))
  (local editor-h (* (+ pixel-size 1) h))
  (activate self :tile x y editor-w editor-h)
  (for [bitx 0 (- w 1)] (for [bity 0 (- h 1)]
    (local (ibyte ibit mask) (self:map-bitxy bitx bity))
    (local b (get-bits tile ibyte ibit mask))
    (local (px py) (values (+ x (* bitx (+ pixel-size 1))) (+ y (* bity (+ pixel-size 1)))))
    (local (colorbg colorfg) (self:pixel-color b ibyte ibit))
    (self:draw-pixel px py colorbg colorfg)
    (when (and (active? self :tile) (mouse-inside px py pixel-size pixel-size))
      (self:draw-on b)
      (local bits (self:draw-bits))
      (when (not= bits b)
        (self:update-tile (set-tile-bits tile ibyte ibit mask bits))))))
  (love.graphics.setColor 1 1 1 1)
  (values editor-w editor-h))

(fn TileView.draw-tile-flag [self flagname x y]
  (local flags (-?> self.tilecache.tiles (. self.itile) (. :flags)))
  (local flagset (if flags (. flags flagname) false))
  (let [(checked yNew) (checkbox self flagname flagset x y)]
    (when checked (tset flags flagname (if flagset nil true)))
    yNew))

(fn TileView.draw-tile-flags [self x y]
  (local tile (-?> self.tilecache.tiles (. self.itile)))
  (var y y)
  (when tile
    (set (tile.word y) (textfield self "Default word" tile.word x (+ y style.padding.y) (* 100 SCALE) (* 200 SCALE)))
    (set (tile.label y) (textfield self "Label" tile.label x (+ y style.padding.y) (* 100 SCALE) (* 200 SCALE))))
  (each [iflag flagname (ipairs (tiles.flags))]
    (set y (self:draw-tile-flag flagname x (+ y style.padding.y))))
  y)

(fn TileView.draw-tile-preview [self x y]
  (each [_ [tx ty] (ipairs (self:preview-locations))]
    (self:draw-sprite (+ x (* tx self.sprite-scale)) (+ y (* ty self.sprite-scale)) self.itile self.tilekey)))

(fn TileView.draw-tile-palette [self x y w]
  (local pal (self:palette))
  (if pal
    (do (var cx x)
        (var cy y)
        (each [icolor color (ipairs pal)]
          (when (>= cx w)
            (set cx x)
            (set cy (+ cy pixel-size style.padding.y)))
          (when (button self [:pal icolor] cx cy pixel-size pixel-size)
            (set self.icolor icolor))
          (renderer.draw_rect cx cy pixel-size pixel-size color)
          (when (= icolor self.icolor)
            (love.graphics.setColor 1 1 1 1)
            (love.graphics.rectangle :line (- cx 2) (- cy 2) (+ pixel-size 4) (+ pixel-size 4)))
          (set cx (+ cx pixel-size style.padding.x)))
        (+ pixel-size style.padding.y))
    0))

(fn TileView.update-tile [self newtile]
  (self.tilecache:update-tile self.itile newtile self.tilekey))

(fn TileView.draw [self]
  (self:draw_background style.background)
  (self:draw_scrollbar)
  (local (x y) (values (+ self.position.x style.padding.x (- self.scroll.x))
                       (+ self.position.y style.padding.y (- self.scroll.y))))
  (local (editor-w editor-h) (self:draw-tile-editor (self:tile) x y))
  (local preview-y (self:draw-tile-flags (+ x editor-w pixel-size) y))
  (self:draw-tile-preview (+ x editor-w pixel-size) (+ preview-y style.padding.y))
  (var selector-y (+ y editor-h pixel-size))
  (set selector-y (+ selector-y (self:draw-tile-palette x selector-y (- self.size.x 20))))
  (each [_ key (ipairs (self:tilekeys))]
    (local selector-h (self:draw-tile-selector x selector-y (- self.size.x 20) key))
    (set selector-y (+ selector-y selector-h pixel-size)))
  (set self.scrollheight (- selector-y y)))

(fn TileView.resource-key [self] :tiles)
(fn TileView.get_name [self] "Tile Editor")

TileView