(local GraphicsEditView (require :editor.gfxedit))
(local style (require :core.style))
(local util (require :lib.util))
(local lume (require :lib.lume))
(local {: mouse-inside : activate : active? : checkbox : textfield : textbutton} (util.require :editor.imstate))
(local {: tilestrip-to-sprite} (util.require :editor.tiledraw))
(local {: encode-yx : encode-itile : decode-itile} (util.require :game.tiles))

(local MapEditView (GraphicsEditView:extend))
(local sprite-scale 3)
(local mapw 20)
(local maph 12)
(local tilew (* sprite-scale 14))
(local tileh (* sprite-scale 16))

(fn MapEditView.new [self filename]
  (MapEditView.super.new self)
  (set self.sprite-scale sprite-scale)
  (set self.stripcache {})
  (set self.mapfilename filename)
  (self:reload))

; map is stored bottom-to-top
(fn imap-from-xy [mx my]
  (+ mx -1 (* mapw (- maph my))))

(fn update-map [map mx my itile]
  (local imap (imap-from-xy mx my))
  (local enctile (encode-itile itile))
  (..
    (map:sub 1 imap)
    (string.char enctile)
    (map:sub (+ imap 2))))

(fn MapEditView.itile-from-xy [self mx my]
  (local imap (+ (imap-from-xy mx my) 1))
  (local enctile (string.byte (self.level.map:sub imap imap)))
  (decode-itile enctile))

(fn MapEditView.set-tile [self mx my itile]
  (set self.level.map (update-map self.level.map mx my itile)))

(fn MapEditView.iobject-from-xy [self mx my ?iobj]
  (local iobj (or ?iobj 1))
  (local obj (. self.level.objects iobj))
  (when obj
    (if (and (= obj.x mx) (= obj.y my))
      iobj
      (self:iobject-from-xy mx my (+ iobj 1)))))
(fn MapEditView.object [self] (. self.level.objects self.iobject))

(fn move-object [objects iobjectsrc iobjectdst]
  (each [_ object (pairs objects)]
    (when (= object.link iobjectsrc)
      (set object.link iobjectdst)))
  (tset objects iobjectdst (. objects iobjectsrc))
  (tset objects iobjectsrc nil)
  (when (. objects (+ iobjectsrc 1))
    (move-object objects (+ iobjectsrc 1) iobjectsrc)))

(fn MapEditView.linking-obj [self] (. self.level.objects self.iobject-linking))
(fn MapEditView.draw-link-line [self x y iobjectSrc color toMouse?]
  (local objectSrc (. self.level.objects iobjectSrc))
  (local objectDest (. self.level.objects objectSrc.link))
  (local coord (fn [c m d] (+ c (* (- m 1) d) (/ d 2))))
  (local xStart (coord x objectSrc.x tilew))
  (local yStart (coord y objectSrc.y tileh))
  (when (or toMouse? objectDest)
    (local xEnd (if toMouse? (love.mouse.getX) (coord x objectDest.x tilew)))
    (local yEnd (if toMouse? (love.mouse.getY) (coord y objectDest.y tileh)))
    (love.graphics.setColor (table.unpack color))
    (love.graphics.line xStart yStart xEnd yEnd)
    (love.graphics.circle :line xEnd yEnd (/ tilew 5))
    (love.graphics.setColor 1 1 1)))

(fn MapEditView.draw-tilestrip [self x y my]
  ; stripcache leaks but honestly who cares
  (local tilestrip [])
  (var stripid "")
  (for [mx 1 mapw]
    (local itile (self:itile-from-xy mx my))
    (local tile (. self.tilecache.tiles itile :gfx))
    (table.insert tilestrip tile)
    (set stripid (.. stripid  (string.char itile))))
  (var sprite (. self.stripcache stripid))
  (when (= sprite nil)
    (set sprite (tilestrip-to-sprite tilestrip))
    (tset self.stripcache stripid sprite))
  (love.graphics.draw sprite x y 0 self.sprite-scale self.sprite-scale))

(fn MapEditView.draw-map-editor [self x y]
  (activate self :map x y (* tilew mapw) (* tileh maph))
  (var iobject-over nil)
  (for [my 1 maph]
    (local tiley (+ y (* (- my 1) tileh)))
    (self:draw-tilestrip x tiley my)
    (for [mx 1 mapw]
      (local tilex (+ x (* (- mx 1) tilew)))
      (local itile (self:itile-from-xy mx my))
      (local iobject (self:iobject-from-xy mx my))
      (when (= self.itile nil)
        (let [player :player]
          (match (. self.level player)
            {:x mx :y my} (renderer.draw_text style.font player tilex tiley style.text)))
        (love.graphics.setColor 1 1 1))
      (when (and (not= iobject nil) (= self.itile nil))
        (love.graphics.setColor 1 0 (if (and (= self.itile nil) (= iobject self.iobject)) 1 0))
        (love.graphics.setLineWidth 3)
        (love.graphics.rectangle :line tilex tiley tilew tileh)
        (love.graphics.setColor 1 1 1))
      (when (mouse-inside tilex tiley tilew tileh)
        (when (not= iobject nil) (set iobject-over iobject))
        (renderer.draw_text style.font (string.format "%x" (encode-yx {:x mx :y my})) tilex (+ tiley 15) style.text)
        (love.graphics.setColor 1 1 1))
      (when (and self.itile (active? self :map) (mouse-inside tilex tiley tilew tileh) (not= itile self.itile))
        (self:set-tile mx my self.itile))
      (when (and (= self.itile nil) (active? self :map) (mouse-inside tilex tiley tilew tileh))
        (match self.imstate.left
          :pressed (set self.iobject-linking iobject)
          :released
          (if (and (not= iobject nil) (= self.iobject-linking iobject))
              (set self.iobject iobject)

              (not= self.iobject-linking nil)
              (tset (self:linking-obj) :link iobject)

              (not= self.playerpos nil)
              (do (tset self.level self.playerpos {:x mx :y my})
                  (set self.playerpos nil))

              (= iobject nil)
              (let [tile (self.tilecache:tile itile)]
                (table.insert self.level.objects {:x mx :y my :func (or tile.word "")})
                (set self.iobject (length self.level.objects))))))))
  (when (= self.itile nil)
    (for [iobject 1 (length self.level.objects)]
      (self:draw-link-line x y iobject [0 0 1 0.3]))
    (when (not= iobject-over nil) (self:draw-link-line x y iobject-over [0 0.5 1] false))
    (when (not= self.iobject-linking nil)
      (if (= self.imstate.left :released) (set self.iobject-linking nil)
        (self:draw-link-line x y self.iobject-linking [0 1 0] true)))))

(fn MapEditView.draw-object-editor [self x y]
  (var y y)
  (local object (self:object))
  (set (object.func y)     (textfield self "Word" object.func x y 100 200))
  (set (object.name y)     (textfield self "Name" object.name x (+ y 5) 100 200))
  (set (object.linkword y) (textfield self "Link word" object.linkword x (+ y 5) 100 200))
  (if object.link
    (match (textbutton self "Unlink" x (+ y 5))
      (unlink yNext) (do (when unlink (set object.link nil))
                         (set y yNext)))
    (set (object.linkentity y) (textfield self "Link entity" object.linkentity x (+ y 5) 100 200)))
  (when (textbutton self "Delete" x (+ y 40))
    (move-object self.level.objects (+ self.iobject 1) self.iobject)
    (set self.iobject nil)))

(fn MapEditView.reload [self]
  (MapEditView.super.reload self)
  (local (loaded level) (pcall #(util.readjson self.mapfilename)))
  (set self.level
    (match (and loaded (type level))
      false {:map (string.rep "\0" (* mapw maph)) :objects []}
      :string {:map (level:fromhex) :objects []}
      :table (doto level (tset :map (level.map:fromhex))))))

(fn MapEditView.save [self]
  (util.writejson self.mapfilename
    (doto (lume.clone self.level)
      (tset :map (self.level.map:tohex)))))

(fn MapEditView.draw [self]
  (var x (+ self.position.x 10))
  (var y (+ self.position.y 10))
  (self:draw_background style.background)
  (love.graphics.setColor 1 1 1 1)
  (self:draw-map-editor x y)
  (when self.iobject
    (self:draw-object-editor (+ x (* tilew mapw) 10) y))
  (set y (+ y (* tileh maph) 10))
  (set self.level.tickword (textfield self "Tick word" self.level.tickword x y 100 200))
  (set y (+ y 30))
  (set self.level.moveword (textfield self "Move word" self.level.moveword x y 100 200))
  (set y (+ y 30))
  (set self.level.loadword (textfield self "Load word" self.level.loadword x y 100 200))
  (set y (+ y 30))
  (when (checkbox self "Edit objects" (= self.itile nil) x y)
    (set self.itile nil)
    (set self.playerpos nil))
  (set y (+ y 30))
  (let [player :player]
    (when (checkbox self (.. "Position " player) (and (= self.itile nil) (= self.playerpos player)) x y)
      (set self.itile nil)
      (set self.playerpos player))
    (set y (+ y 30)))
  (set y (+ y 30))
  (self:draw-tile-selector x y (- self.size.x 20)))

(fn MapEditView.get_name [self] (.. "Map: " self.mapfilename))

MapEditView