local live = require 'live'

-- love.keyboard.isDown doesn't work on Android, so emulate it using
-- keypressed and keyreleased events
local Keys_down = {}
function key_down(key) return Keys_down[key] end

-- main entrypoint for LÖVE
--
-- Most apps can just use the default shown in https://love2d.org/wiki/love.run,
-- but we need to override it to recover from errors.
function love.run()
  love.handlers.keypressed = function(key, scancode, is_repeat)
    Keys_down[key] = true
    if love.keypressed then return love.keypressed(key, scancode, is_repeat) end
  end
  love.handlers.keyreleased = function(key, scancode)
    Keys_down[key] = nil
    if love.keyreleased then return love.keyreleased(key, scancode) end
  end
  if love.load then
    xpcall(function() love.load(love.arg.parseGameArguments(arg), arg) end, live.handle_initialization_error)
  end

  if love.timer then love.timer.step() end

  -- protect against runtime errors
  return function()
    local status, result = xpcall(run_frame, live.handle_error)
    return result
  end
end

-- one iteration of the event loop
-- return nil to continue the event loop, non-nil to quit
function run_frame()
  if love.event then
    love.event.pump()
    for name, a,b,c,d,e,f in love.event.poll() do
      if name == 'quit' then
        if not love.quit or not love.quit() then
          return a or 0
        end
      end
      love.handlers[name](a,b,c,d,e,f)
    end
  end

  local dt = 0
  if love.timer then dt = love.timer.step() end
  if love.update then love.update(dt) end

  if love.graphics and love.graphics.isActive() then
    love.graphics.origin()
    love.graphics.clear(love.graphics.getBackgroundColor())
    if love.draw then love.draw() end
    love.graphics.present()
  end

  if love.timer then love.timer.sleep(0.001) end
end

-- Some helpers for Carousel programs.
--
-- I feel ambivalent about these in Dec 2024.
--
-- My apps originally included a harness for automated tests.
-- This harness depended on apps using shims for a few things I wanted to
-- test.
-- That way my app could call say App.screen.print, and tests would not
-- actually draw to the real screen.
--
-- However, tests aren't really a focus of Lua Carousel, and they were not a
-- priority for Carousel2's upstreams.
-- I still ended up using some of the App.* names in older example programs on
-- the Lua Carousel devlog.
--
-- I guess I'll continue to support the bare minimum of App.* names for now
-- just because adding corrections to the devlog seems like a lot of clutter.
--
-- I do care very much that someone can go to any older program on the devlog
-- and it continue to run on newer versions of Carousel.
--
-- But for now I don't care about these App.* names beyond making those older
-- devlog posts work. I'm not going to actually use them going forward. For
-- now..

App = {}

function App.width(text)
  return love.graphics.getFont():getWidth(text)
end

local function solo_touch()
  local touches = love.touch.getTouches()
  return #touches == 1
end
function App.mouse_down(mouse_button)
  return love.mouse.isDown(mouse_button) or solo_touch()
end

local function solo_touchX()
  local touches = love.touch.getTouches()
  if #touches ~= 1 then return end
  local x,y = love.touch.getPosition(touches[1])
  return x
end
function App.mouse_x()
  return love.mouse.getX() or solo_touchX()
end

local function solo_touchY()
  local touches = love.touch.getTouches()
  if #touches ~= 1 then return end
  local x,y = love.touch.getPosition(touches[1])
  return y
end
function App.mouse_y()
  return love.mouse.getY() or solo_touchY()
end

-- Some useful helpers for programs.

local major_version, _ = love.getVersion()
major_version = tonumber(major_version)
if major_version < 12 then
  nativefs = require 'nativefs'
end
json = require 'json'
utf8 = require 'utf8'

array = require 'array'
my_utf8 = require 'my_utf8'
utils = require 'utils'
Foreground_color = {0, 0, 0}  -- available to app; indexed by position rather than r/g/b to work with select_rgb
colorize = require 'colorize'  -- must come after Foreground_color is defined

require 'button'
require 'wav'