--- Component to handle basic GUI button
-- @module druid.button

--- Button gui component
--@class druid

--- Component events
-- @table Events
-- @tfield druid_event on_click On release button callback
-- @tfield druid_event on_repeated_click On repeated action button callback
-- @tfield druid_event on_long_click On long tap button callback
-- @tfield druid_event on_double_click On double tap button callback

--- Component fields
-- @table Fields
-- @tfield node node Trigger node
-- @tfield[opt=node] node anim_node Animation node
-- @tfield vector3 scale_from Initial scale of anim_node
-- @tfield vector3 pos Initial pos of anim_node
-- @tfield any params Params to click callbacks
-- @tfield boolean hover_anim Is hover anim enabled
-- @tfield druid.hover hover Druid hover logic component
-- @tfield[opt] node click_zone Restriction zone

--- Component style params
-- @table Style
-- @tfield function on_click (self, node)
-- @tfield function on_click_disabled (self, node)
-- @tfield function on_hover (self, node, hover_state)
-- @tfield function on_set_enabled (self, node, enabled_state)
-- @tfield bool IS_HOVER

local Event = require("druid.event")
local const = require("druid.const")
local helper = require("druid.helper")
local component = require("druid.component")

local M = component.create("button", { const.ON_INPUT })


local function on_button_hover(self, hover_state)
	if not self.style.on_hover then
		return
	end

	self.style.on_hover(self, self.anim_node, hover_state)
end


local function on_button_release(self)
	if not self.disabled then
		if not self.stub and self.can_action then
			self.can_action = false
			if self.style.on_click then
				self.style.on_click(self, self.anim_node)
			end
			self.on_click:trigger(self:get_context(), self.params, self)
		end
		return true
	else
		if self.style.on_click_disabled then
			self.style.on_click_disabled(self, self.anim_node)
		end
		return false
	end
end


--- Component init function
-- @function button:init
-- @tparam table self Component instance
-- @tparam node node Gui node
-- @tparam function callback Button callback
-- @tparam[opt] table params Button callback params
-- @tparam[opt] node anim_node Button anim node (node, if not provided)
-- @tparam[opt] string event Button react event, const.ACTION_TOUCH by default
function M.init(self, node, callback, params, anim_node, event)
	self.druid = self:get_druid()
	self.style = self:get_style()
	self.node = self:get_node(node)

	self.anim_node = anim_node and helper:get_node(anim_node) or self.node
	-- TODO: rename to start_scale
	self.scale_from = gui.get_scale(self.anim_node)
	self.params = params
	self.hover_anim = self.style.IS_HOVER
	self.hover = self.druid:new_hover(node, self, on_button_hover)
	self.click_zone = nil

	-- Event stubs
	self.on_click = Event(callback)
	self.on_repeated_click = Event()
	self.on_long_click = Event()
	self.on_double_click = Event()
end


function M.on_input(self, action_id, action)
	if action_id ~= const.ACTION_TOUCH then
		return false
	end

	if not helper.is_enabled(self.node) then
		return false
	end

	local is_pick = gui.pick_node(self.node, action.x, action.y)
	if self.click_zone then
		is_pick = is_pick and gui.pick_node(self.click_zone, action.x, action.y)
	end

	if not is_pick then
		-- Can't interact, if touch outside of button
		self.can_action = false
		return false
	end

	if action.pressed then
		-- Can interact if start touch on the button
		self.can_action = true
		self.repeated_counter = 0
		return true
	end

	if action.released then
		return on_button_release(self)
	end

	return not self.disabled
end


function M.on_input_interrupt(self)
	self.can_action = false
end


function M.set_enabled(self, state)
	self.disabled = not state
	if self.style.on_set_enabled then
		self.style.on_set_enabled(self, self.node, state)
	end
end


function M.get_enabled(self)
	return not self.disabled
end


--- Disable all button animations
-- @function button:disable_animation
-- @tparam table self Component instance
function M.disable_animation(self)
	self.hover_anim = false
end


--- Strict button click area. Useful for
-- no click events outside stencil node
-- @function button:set_click_zone
-- @tparam table self Component instance
-- @tparam node zone Gui node
function M.set_click_zone(self, zone)
	self.click_zone = self:get_node(zone)
end


-- TODO: implement them all!
--- Set key-code to trigger this button
function M.set_key_trigger(self, key)

end


--- Get key-code to trigger this button
function M.get_key_trigger(self)

end


return M