utf8 = require 'utf8'
json = require 'json'

require 'app'
require 'test'
require 'live'

require 'keychord'
require 'button'

-- delegate most business logic to a layer that can be reused by other projects
require 'edit'
Editor_state = {}

-- called both in tests and real run
function App.initialize_globals()
  -- tests currently mostly clear their own state

  -- a few text objects we can avoid recomputing unless the font changes
  Text_cache = {}

  -- blinking cursor
  Cursor_time = 0

  -- for hysteresis in a few places
  Current_time = 0
  Last_focus_time = 0  -- https://love2d.org/forums/viewtopic.php?p=249700
  Last_resize_time = 0
end

-- called only for real run
function App.initialize(arg)
  love.keyboard.setTextInput(true)  -- bring up keyboard on touch screen
  love.keyboard.setKeyRepeat(true)

  Editor_state = nil  -- not used outside editor tests

  love.graphics.setBackgroundColor(1,1,1)

  live.initialize(arg)

  load_settings()

  -- TODO: app-specific stuff goes here
  love.window.setTitle('TODO')

  if on.initialize then on.initialize(arg) end

  if rawget(_G, 'jit') then
    jit.off()
    jit.flush()
  end
end

function love.quit()
  if on.quit then on.quit() end
  love.filesystem.write('config', json.encode(settings()))
end

function settings()
  local x, y, displayindex = App.screen.position()
  return {
    x=x, y=y, displayindex=displayindex,
    width=App.screen.width, height=App.screen.height,
    app = on.save_settings and on.save_settings(),
  }
end

function load_settings()
  if love.filesystem.getInfo('config') then
    local settings = json.decode(love.filesystem.read('config'))
    local width, height, flags = love.window.getMode()
    flags.resizable = true
    flags.minwidth = math.min(width, 200)
    flags.minheight = math.min(height, 200)
    App.screen.flags = flags
    App.screen.width = settings.width
    App.screen.height = settings.height
    love.window.setMode(App.screen.width, App.screen.height, App.screen.flags)
    love.window.setPosition(settings.x, settings.y, settings.displayindex)
    if on.load_settings then on.load_settings(settings.app) end
  else
    local font_height = 20
    love.graphics.setFont(love.graphics.newFont(font_height))
    -- maximize window
    love.window.setMode(0, 0)  -- maximize
    App.screen.width, App.screen.height, App.screen.flags = love.window.getMode()
    -- shrink height slightly to account for window decoration
    App.screen.height = App.screen.height-100
    App.screen.width = 40*App.width(App.newText(love.graphics.getFont(), 'm'))
    App.screen.flags.resizable = true
    App.screen.flags.minwidth = math.min(App.screen.width, 200)
    App.screen.flags.minheight = math.min(App.screen.height, 200)
    love.window.setMode(App.screen.width, App.screen.height, App.screen.flags)
    if on.load_settings then on.load_settings() end
  end
end

function App.resize(w, h)
--?   print(("Window resized to width: %d and height: %d."):format(w, h))
  App.screen.width, App.screen.height = w, h
  Last_resize_time = Current_time
  if on.resize then on.resize(w,h) end
end

function App.filedropped(file)
  if on.file_drop then on.file_drop(file) end
end

function App.draw()
  if on.draw then on.draw() end
end

function App.update(dt)
  Current_time = Current_time + dt
  -- some hysteresis while resizing
  if Current_time < Last_resize_time + 0.1 then
    return
  end
  Cursor_time = Cursor_time + dt
  live.update(dt)
  if on.update then on.update(dt) end
end

function App.mousepressed(x,y, mouse_button)
  Cursor_time = 0  -- ensure cursor is visible immediately after it moves
  if on.mouse_press then on.mouse_press(x,y, mouse_button) end
end

function App.mousereleased(x,y, mouse_button)
  Cursor_time = 0  -- ensure cursor is visible immediately after it moves
  if on.mouse_release then on.mouse_release(x,y, mouse_button) end
end

function App.focus(in_focus)
  if in_focus then
    Last_focus_time = Current_time
  end
  if in_focus then
    love.graphics.setBackgroundColor(1,1,1)
  else
    love.graphics.setBackgroundColor(0.8,0.8,0.8)
  end
  if on.focus then on.focus(in_focus) end
end

-- App.keypressed is defined in keychord.lua

function App.keychord_press(chord, key)
  -- ignore events for some time after window in focus (mostly alt-tab)
  if Current_time < Last_focus_time + 0.01 then
    return
  end
  Cursor_time = 0  -- ensure cursor is visible immediately after it moves
  if on.keychord_press then on.keychord_press(chord, key) end
end

function App.textinput(t)
  -- ignore events for some time after window in focus (mostly alt-tab)
  if Current_time < Last_focus_time + 0.01 then
    return
  end
  Cursor_time = 0  -- ensure cursor is visible immediately after it moves
  if on.text_input then on.text_input(t) end
end

function App.keyreleased(key, scancode)
  -- ignore events for some time after window in focus (mostly alt-tab)
  if Current_time < Last_focus_time + 0.01 then
    return
  end
  Cursor_time = 0  -- ensure cursor is visible immediately after it moves
  if on.key_release then on.key_release(key, scancode) end
end

-- use this sparingly
function to_text(s)
  if Text_cache[s] == nil then
    Text_cache[s] = App.newText(love.graphics.getFont(), s)
  end
  return Text_cache[s]
end