local love = assert( love )
local utf8 = require("utf8")
local modal = require( "ui.modal" )
local t = modal.new{ }

function t.setCurrentModal( fields )
  t.currentModal = assert( fields )
  t.currentIdx = 1
  return t:start()
end

function t.draw()
  if not t.currentModal then return end
  love.graphics.setColor( 0, 0, 0, 0.3 )
  love.graphics.rectangle("fill", 0, 0, love.graphics.getDimensions())


  -- other fields
  for i, field in ipairs( t.currentModal ) do
    love.graphics.setColor( 1, 1, 1, 0.2 )
    local mode = (i == t.currentIdx) and "fill" or "line"    
    love.graphics.rectangle( mode, 200, i * 28, 200, 14, 4 )
    love.graphics.setColor( 1, 1, 1, 1 )
    love.graphics.print( field.name, 8, i * 28 )
    love.graphics.print( field.value, 216, i * 28 )
  end
end

function t.textinput( char )
  if t.currentModal then 
    local field = t.currentModal.currentFieldIdx
    t.currentModal.currentField.value = t.currentModal.currentField.value .. char
  end
end

function t.keypressed(key, code, isRepeat)
  if code == "down" then
    t.currentIdx = t.currentIdx + 1
    if t.currentIdx > #(t.currentModal) then
      t.currentIdx = 1
    end
  elseif code == "up" then
    t.currentIdx = t.currentIdx - 1
    if t.currentIdx < 1 then
      t.currentIdx = #(t.currentModal)
    end
  end

  if key == "backspace" then
    -- get the byte offset to the last UTF-8 character in the string.
    local byteoffset = utf8.offset(text, -1)

    if byteoffset then
      -- remove the last UTF-8 character.
      -- string.sub operates on bytes rather than UTF-8 characters, so we couldn't do string.sub(text, 1, -2).
      text = string.sub(text, 1, byteoffset - 1)
    end
  end
  if key == "escape" then
    return t:stop()
  end
end

return t