Skills = {}

-- private variables
local skillsWindow
local skillsButton

-- private functions
local function getNumberString(number)
  local out = ''
  number = tostring(number):reverse()
  for i=1,#number do
    out = out .. number:sub(i, i)
    if i % 3 == 0 and i ~= #number then
      out = out .. ','
    end
  end
  out = out:reverse()
  return out
end

local function setSkillValue(id, value)
  local skill = skillsWindow:recursiveGetChildById(id)

  if skill then
    local widget = skill:getChildById('value')
    widget:setText(value)
  end
end

local function setSkillPercent(id, percent, tooltip)
  local skill = skillsWindow:recursiveGetChildById(id)

  if skill then
    local widget = skill:getChildById('percent')
    widget:setPercent(percent)

    if tooltip then
      widget:setTooltip(tooltip)
    end
  end
end

-- public functions
function Skills.create()
  skillsWindow = displayUI('skills.otui', { parent = Game.gameRightPanel })
  skillsWindow:hide()
  skillsButton = TopMenu.addGameButton('skillsButton', 'Skills (Ctrl+S)', '/core_styles/icons/skills.png', Skills.toggle)
  Keyboard.bindKeyDown('Ctrl+S', Skills.toggle)
end

function Skills.destroy()
  Keyboard.unbindKeyDown('Ctrl+S')
  skillsButton:destroy()
  skillsButton = nil
  skillsWindow:destroy()
  skillsWindow = nil
end

function Skills.toggle()
  local visible = not skillsWindow:isExplicitlyVisible()
  skillsWindow:setVisible(visible)
  skillsButton:setOn(visible)
end

function Skills.onSkillButtonClick(button)
  local percentBar = button:getChildById('percent')
  if percentBar then
    percentBar:setVisible(not percentBar:isVisible())
    if percentBar:isVisible() then
      button:setHeight(21)
    else
      button:setHeight(21 - 6)
    end
  end
end

-- hooked events
function Skills.onExperienceChange(value)
  setSkillValue('experience', getNumberString(value))
end

function Skills.onLevelChange(value, percent)
  setSkillValue('level', getNumberString(value))
  setSkillPercent('level', percent, 'You have ' .. (100 - percent) .. ' percent to go')
end

function Skills.onHealthChange(health, maxHealth)
  setSkillValue('health', getNumberString(health))
end

function Skills.onManaChange(mana, maxMana)
  setSkillValue('mana', getNumberString(mana))
end

function Skills.onSoulChange(soul)
  setSkillValue('soul', soul)
end

function Skills.onFreeCapacityChange(freeCapacity)
  setSkillValue('capacity', freeCapacity)
end

function Skills.onStaminaChange(stamina)
  local hours = math.floor(stamina / 60)
  local minutes = stamina % 60
  if minutes < 10 then
    minutes = '0' .. minutes
  end
  local percent = 100 * stamina / (42 * 60) -- max is 42 hours

  setSkillValue('stamina', hours .. ":" .. minutes)
  setSkillPercent('stamina', percent, 'You have ' .. percent .. ' percent')
end

function Skills.onMagicLevelChange(value, percent)
  setSkillValue('magiclevel', value)
  setSkillPercent('magiclevel', percent, 'You have ' .. (100 - percent) .. ' percent to go')
end

function Skills.onSkillChange(id, level, percent)
  setSkillValue('skillId' .. id, level)
  setSkillPercent('skillId' .. id, percent, 'You have ' .. (100 - percent) .. ' percent to go')
end

connect(Game, { onGameStart = Skills.create,
                onGameEnd = Skills.destroy,
                onExperienceChange = Skills.onExperienceChange,
                onLevelChange = Skills.onLevelChange,
                onHealthChange = Skills.onHealthChange,
                onManaChange = Skills.onManaChange,
                onSoulChange = Skills.onSoulChange,
                onFreeCapacityChange = Skills.onFreeCapacityChange,
                onStaminaChange = Skills.onStaminaChange,
                onMagicLevelChange = Skills.onMagicLevelChange,
                onSkillChange = Skills.onSkillChange })