require("map_gen.shared.builders")
require("utils.poisson_rng")

local function do_row(row, data)  
  local y = data.top_y + row
  local top_x = data.top_x

  for x = top_x, top_x + 31 do

    -- local coords need to be 'centered' to allow for correct rotation and scaling.
    local tile, entity = MAP_GEN(x + 0.5, y + 0.5, x, y)

    if type(tile) == "boolean" and not tile then
      table.insert(data.tiles, {name = "out-of-map", position = {x, y}})
    elseif type(tile) == "string" then
      table.insert(data.tiles, {name = tile, position = {x, y}})
    end

    if map_gen_decoratives then
      tile_decoratives = check_decorative(tile, x, y)
      for _,tbl in ipairs(tile_decoratives) do
        table.insert(data.decoratives, tbl)
      end

      tile_entities = check_entities(tile, x, y)
      for _,entity in ipairs(tile_entities) do
        table.insert(data.entities, entity)
      end
    end    

    if entity then
      table.insert(data.entities, entity)
    end 
  end
end

local function do_place_tiles(data)  
  data.surface.set_tiles(data.tiles, true)
end

local function do_place_decoratives(data)
  if not map_gen_decoratives then return end

  for _, e in pairs(surface.find_entities_filtered{area=area, type="decorative"}) do
    e.destroy()
  end
  for _, e in pairs(surface.find_entities_filtered{area=area, type="simple-entity"}) do
    e.destroy()
  end 

  local surface = data.surface
  for _,d in pairs(data.decoratives) do
    surface.create_decoratives{check_collision=false, decoratives={d}}
  end
end

local function do_place_entities(data)
  local surface = data.surface
  for _, e in ipairs(data.entities) do
    if surface.can_place_entity(e) then
      surface.create_entity(e)
    end
  end
end

function run_combined_module(event)

   if MAP_GEN == nil then
      game.print("MAP_GEN not set")
      return
   end

   local area = event.area
   local surface = event.surface
   MAP_GEN_SURFACE = surface

   local data = 
   {     
      top_x = area.left_top.x,
      top_y = area.left_top.y ,
      surface = surface,
      tiles = {},
      entities = {},
      decoratives = {}      
   }

   for row = 0, 31 do
    do_row(row, data)
   end

   do_place_tiles(data)
   do_place_decoratives(data)
   do_place_entities(data)

end

local decorative_options = {
   ["concrete"] = {},
   ["deepwater"] = {},
   ["deepwater-green"] = {
      {"brown-carpet-grass", 100},
      {"brown-cane-cluster", 500},
   },
   ["dirt-3"] = {
      {"brown-carpet-grass", 100},
      {"brown-cane-cluster", 200},
      {"sand-rock-small", 150},
   },
   ["dirt-6"] = {
      {"sand-rock-small", 150},
      {"red-asterisk", 45},
      {"red-desert-bush", 12},
      {"rock-medium", 375},


   },
   ["grass-1"] = {
      {"green-carpet-grass-1", 3},
      {"green-hairy-grass-1", 7},
      {"green-bush-mini", 10},
      {"green-pita", 6},
      {"green-small-grass-1", 12},
      {"green-asterisk", 25},
      {"green-bush-mini", 7},
      {"garballo", 20},
   },
   ["grass-3"] = {
      {"green-carpet-grass-1", 12},
      {"green-hairy-grass-1", 28},
      {"green-bush-mini", 40},
      {"green-pita", 24},
      {"green-small-grass-1", 48},
      {"green-asterisk", 100},
      {"green-bush-mini", 28},
   },
   ["grass-2"] = {
      {"green-hairy-grass-1", 56},
      {"green-bush-mini", 80},
      {"green-pita", 48},
      {"green-small-grass-1", 96},
      {"green-asterisk", 200},
      {"green-bush-mini", 56},
      {"brown-cane-cluster", 100},
      {"brown-carpet-grass", 100},
   },
   ["hazard-concrete-left"] = {},
   ["hazard-concrete-right"] = {},
   ["lab-dark-1"] = {},
   ["lab-dark-2"] = {},
   ["red-desert"] = {
      {"brown-carpet-grass", 35},
      {"orange-coral-mini", 45},
      {"red-asterisk", 45},
      {"red-desert-bush", 12},
      {"rock-medium", 375},
      {"sand-rock-small", 200},
      {"sand-rock-small", 30},
   },
   ["red-desert-dark"] = {
      {"brown-carpet-grass", 70},
      {"orange-coral-mini", 90},
      {"red-asterisk", 90},
      {"red-desert-bush", 35},
      {"rock-medium", 375},
      {"sand-rock-small", 200},
      {"sand-rock-small", 150},
   },
   ["sand-1"] = {
      {"brown-carpet-grass", 35},
      {"orange-coral-mini", 45},
      {"red-asterisk", 45},
      {"brown-asterisk", 45},
   },
   ["sand-3"] = {
      {"brown-carpet-grass", 35},
      {"orange-coral-mini", 45},
      {"brown-asterisk", 45},
   },
   ["stone-path"] = {},
   ["water"] = {},
   ["water-green"] = {},
   ["out-of-map"] = {},
}

local function check_decorative(tile, x, y)
   local options = decorative_options[tile]
   local tile_decoratives = {}

   for _,e in ipairs(options) do
      name = e[1]
      high_roll = e[2]
      if poisson_rng_next(high_roll / 2 ) == 1 then
         table.insert(tile_decoratives, {name=name, amount=1, position={x,y}})
      end
   end

   return tile_decoratives
end

local entity_options = {
   ["concrete"] = {},
   ["deepwater"] = {},
   ["deepwater-green"] = {},
   ["water"] = {},
   ["water-green"] = {},
   ["dirt-3"] = {
      {"tree-01", 500},
      {"tree-06", 300},
      {"tree-07", 800},
      {"tree-09", 2000},
      {"rock-big", 400},
   },
   ["dirt-6"] = {
      {"tree-06", 150},
      {"tree-07", 400},
      {"tree-09", 1000},
      {"rock-big", 300},
   },
   ["grass-1"] = {
      {"tree-01", 150},
      {"tree-04", 400},
      {"tree-06", 400},
      {"tree-07", 400},
      {"tree-09", 1000},
      {"rock-big", 400},
      {"green-coral", 10000},
   },
   ["grass-3"] = {
      {"tree-02", 400},
      {"tree-03", 400},
      {"tree-04", 800},
      {"tree-06", 300},
      {"tree-07", 800},
      {"tree-08", 400},
      {"tree-09", 2000},
      {"rock-big", 400},
   },
   ["grass-2"] = {
      {"tree-04", 800},
      {"tree-06", 300},
      {"tree-07", 400},
      {"tree-09", 1000},
      {"dry-tree", 1000},
      {"rock-big", 200},
   },
   ["hazard-concrete-left"] = {},
   ["hazard-concrete-right"] = {},
   ["lab-dark-1"] = {},
   ["lab-dark-2"] = {},
   ["red-desert"] = {
      {"dry-tree", 400},
      {"dry-hairy-tree", 400},
      {"tree-06", 500},
      {"tree-06", 500},
      {"tree-01", 500},
      {"tree-02", 500},
      {"tree-03", 500},
      {"sand-rock-big", 200},
      {"sand-rock-big", 400},
      {"red-desert-rock-huge-02", 400},
   },
   ["red-desert-dark"] = {
      {"dry-tree", 400},
      {"dry-hairy-tree", 400},
      {"tree-06", 500},
      {"tree-06", 500},
      {"tree-01", 500},
      {"tree-02", 500},
      {"tree-03", 500},
      {"sand-rock-big", 200},
      {"sand-rock-big", 400},
      {"red-desert-rock-huge-02", 400},
   },
   ["sand-1"] = {
      {"dry-tree", 1000},
      {"dry-hairy-tree", 1000},
      {"dead-tree", 1000},
      {"rock-big", 150},

   },
   ["sand-3"] = {
      {"dead-tree", 1000},
      {"dry-tree", 1000},
      {"dry-hairy-tree", 1000},
      {"rock-big", 150},

   },
   ["stone-path"] = {},
   ["out-of-map"] = {},
}

function check_entities(tile, x, y)
   local options = entity_options[tile]
   local tile_entity_list = {}

   for _,e in ipairs(options) do
      name = e[1]
      high_roll = e[2]
      if poisson_rng_next( high_roll / 2 ) == 1 then
         table.insert(tile_entity_list, {name=name, position={x,y}})
      end
   end

   return tile_entity_list
end