local M = {}

local collection_template
local gui_script_content
local gui_file_content

local function ends_with(str, ending)
    return ending == "" or str:sub(-#ending) == ending
end

local function file_exists(name)
    local f=io.open(name,"r")
    if f~=nil then io.close(f) return true else return false end
end

local function get_filename(path)   
    local main, filename, extension = path:match("(.-)([^\\/]-%.?([^%.\\/]*))$")
    return main, filename
end

local function create_files(file_path)
    -- Construct paths
    local path = editor.get(file_path, "path")
    local main, filename = get_filename(path)
    local basename = filename:match("(.+)%..+")
    local target_collection_path = "." .. main .. basename .. ".collection"
    local target_gui_script_path = "." .. main .. basename .. ".gui_script"
    local target_gui_path = "." .. main .. basename .. ".gui"

    -- Create the files if they don't exists
    if not file_exists(target_collection_path) then
        local collection_content = collection_template(path, basename)
        local collection = io.open(target_collection_path, "w")
        collection:write(collection_content)
        collection:close()
    end
    if not file_exists(target_gui_script_path) then
        local gui_script = io.open(target_gui_script_path, "w")
        gui_script:write(gui_script_content)
        gui_script:close()

        -- Put the gui_script path into the gui file
        local gui_file = io.open("." .. path, "rb")
        local gui_text = gui_file:read("*a")
        gui_file:close()

        gui_text = string.gsub(gui_text, 'script: "%.*"', [[script: "]] .. main .. basename .. ".gui_script" .. [["]])

        gui_file = io.open("." .. path, "w")
        gui_file:write(gui_text)
        gui_file:close()
    end
    if not file_exists(target_gui_path) then
        local gui_content = gui_template(path)
        local gui = io.open(target_gui_path, "w")
        gui:write(gui_content)
        gui:close()
    end
end

function M.get_commands()
    return {
        {
            label="Create Monarch Scene From...",
            locations = {"Assets"},
            query = {
                selection = {type = "resource", cardinality = "one"}
            },
            active = function(opts)
                local path = editor.get(opts.selection, "path")
                return ends_with(path, ".gui")
            end,
            run = function(opts)
                create_files(opts.selection)
            end
        }
    }
end

gui_template = function(gui_script)
    return [[script: "]].. gui_script .. [["
background_color {
    x: 0.0
    y: 0.0
    z: 0.0
    w: 0.0
}
material: "/builtins/materials/gui.material"
adjust_reference: ADJUST_REFERENCE_PARENT
max_nodes: 512
]] 
end

gui_script_content = [[local monarch = require "monarch.monarch"

function init(self)
    msg.post(".", "acquire_input_focus")
end

function final(self)
end

function update(self, dt)
end

function on_message(self, message_id, message, sender)
end

function on_input(self, action_id, action)
end

function on_reload(self)
end
]]


collection_template = function(gui_script, name)
    return [[name: "]].. name .. [["
scale_along_z: 0
embedded_instances {
  id: "go"
  data: "components {\n"
  "  id: \"monarch\"\n"
  "  component: \"]].. gui_script .. [[\"\n"
  "  position {\n"
  "    x: 0.0\n"
  "    y: 0.0\n"
  "    z: 0.0\n"
  "  }\n"
  "  rotation {\n"
  "    x: 0.0\n"
  "    y: 0.0\n"
  "    z: 0.0\n"
  "    w: 1.0\n"
  "  }\n"
  "}\n"
  ""
  position {
      x: 0.0
      y: 0.0
      z: 0.0
  }
  rotation {
      x: 0.0
      y: 0.0
      z: 0.0
      w: 1.0
  }
  scale3 {
      x: 1.0
      y: 1.0
      z: 1.0
  }
}
]]

end



return M