local InputContainer = require("ui/widget/container/inputcontainer")
local CenterContainer = require("ui/widget/container/centercontainer")
local RightContainer = require("ui/widget/container/rightcontainer")
local FrameContainer = require("ui/widget/container/framecontainer")
local BottomContainer = require("ui/widget/container/bottomcontainer")
local UnderlineContainer = require("ui/widget/container/underlinecontainer")
local ImageWidget = require("ui/widget/imagewidget")
local TextWidget = require("ui/widget/textwidget")
local FixedTextWidget = require("ui/widget/fixedtextwidget")
local ToggleSwitch = require("ui/widget/toggleswitch")
local Font = require("ui/font")
local Device = require("ui/device")
local GestureRange = require("ui/gesturerange")
local UIManager = require("ui/uimanager")
local RectSpan = require("ui/widget/rectspan")
local HorizontalSpan = require("ui/widget/horizontalspan")
local HorizontalGroup = require("ui/widget/horizontalgroup")
local VerticalSpan = require("ui/widget/verticalspan")
local VerticalGroup = require("ui/widget/verticalgroup")
local Geom = require("ui/geometry")
local Screen = require("ui/screen")
local Event = require("ui/event")
local _ = require("gettext")

local MenuBarItem = InputContainer:new{}
function MenuBarItem:init()
	self.dimen = self[1]:getSize()
	-- we need this table per-instance, so we declare it here
	if Device:isTouchDevice() then
		self.ges_events = {
			TapSelect = {
				GestureRange:new{
					ges = "tap",
					range = self.dimen,
				},
				doc = _("Select Menu Item"),
			},
		}
	else
		self.active_key_events = {
			Select = { {"Press"}, doc = _("chose selected item") },
		}
	end
end

function MenuBarItem:onTapSelect()
	UIManager:scheduleIn(0.0, function() self:invert(true) end)
	UIManager:scheduleIn(0.1, function()
		UIManager:sendEvent(Event:new("ShowConfigPanel", self.index))
	end)
	UIManager:scheduleIn(0.5, function() self:invert(false) end)
	return true
end

function MenuBarItem:invert(invert)
	self[1].invert = invert
	UIManager.update_region_func = function()
		DEBUG("update icon region", self[1].dimen)
		return self[1].dimen
	end
	UIManager:setDirty(self.config, "full")
end

local OptionTextItem = InputContainer:new{}
function OptionTextItem:init()
	local text_widget = self[1]
	
	self[1] = UnderlineContainer:new{
		text_widget,
		padding = self.padding,
		color = self.color,
	}
	self.dimen = self[1]:getSize()
	-- we need this table per-instance, so we declare it here
	if Device:isTouchDevice() then
		self.ges_events = {
			TapSelect = {
				GestureRange:new{
					ges = "tap",
					range = self.dimen,
				},
				doc = _("Select Option Item"),
			},
		}
	else
		self.active_key_events = {
			Select = { {"Press"}, doc = _("chose selected item") },
		}
	end
end

function OptionTextItem:onTapSelect()
	for _, item in pairs(self.items) do
		item[1].color = 0
	end
	self[1].color = 15
	local option_value = nil
	local option_arg = nil
	if self.values then
		self.values = self.values or {}
		option_value = self.values[self.current_item]
		self.config:onConfigChoice(self.name, option_value)
	end
	if self.event then
		self.args = self.args or {}
		option_arg = self.args[self.current_item]
		self.config:onConfigEvent(self.event, option_arg)
	end
	if self.events then
		for i=0,#self.events do
			self.events[i].args = self.events[i].args or {}
			option_arg = self.events[i].args[self.current_item]
			self.config:onConfigEvent(self.events[i].event, option_arg)
		end
	end
	UIManager.repaint_all = true
	return true
end

local OptionIconItem = InputContainer:new{}
function OptionIconItem:init()
	self.dimen = self.icon:getSize()
	self[1] = UnderlineContainer:new{
		self.icon,
		padding = self.padding,
		color = self.color,
	}
	-- we need this table per-instance, so we declare it here
	if Device:isTouchDevice() then
		self.ges_events = {
			TapSelect = {
				GestureRange:new{
					ges = "tap",
					range = self.dimen,
				},
				doc = _("Select Option Item"),
			},
		}
	end
end

function OptionIconItem:onTapSelect()
	for _, item in pairs(self.items) do
		--item[1][1].invert = false
		item[1].color = 0
	end
	--self[1][1].invert = true
	self[1].color = 15
	local option_value = nil
	local option_arg = nil
	if type(self.values) == "table" then
		option_value = self.values[self.current_item]
		self.config:onConfigChoice(self.name, option_value, self.event)
	elseif type(self.args) == "table" then
		option_arg = self.args[self.current_item]
		self.config:onConfigChoice(self.name, option_arg, self.event)
	end
	UIManager.repaint_all = true
	return true
end

local ConfigOption = CenterContainer:new{}
function ConfigOption:init()
	local default_name_font_size = 20
	local default_item_font_size = 16
	local default_items_spacing = 30
	local default_option_height = 50
	local default_option_padding = 15
	local vertical_group = VerticalGroup:new{}
	table.insert(vertical_group, VerticalSpan:new{
		width = Screen:scaleByDPI(default_option_padding),
	})
	for c = 1, #self.options do
		if self.options[c].show ~= false then
			local name_align = self.options[c].name_align_right and self.options[c].name_align_right or 0.33
			local item_align = self.options[c].item_align_center and self.options[c].item_align_center or 0.66
			local name_font_face = self.options[c].name_font_face and self.options[c].name_font_face or "cfont"
			local name_font_size = self.options[c].name_font_size and self.options[c].name_font_size or default_name_font_size
			local item_font_face = self.options[c].item_font_face and self.options[c].item_font_face or "cfont"
			local item_font_size = self.options[c].item_font_size and self.options[c].item_font_size or default_item_font_size
			local option_height = Screen:scaleByDPI(self.options[c].height and self.options[c].height or default_option_height)
			local items_spacing = HorizontalSpan:new{
				width = Screen:scaleByDPI(self.options[c].spacing and self.options[c].spacing or default_items_spacing)
			}
			local horizontal_group = HorizontalGroup:new{}
			if self.options[c].name_text then
				local option_name_container = RightContainer:new{
					dimen = Geom:new{ w = Screen:getWidth()*name_align, h = option_height},
				}
				local option_name =	TextWidget:new{
						text = self.options[c].name_text,
						face = Font:getFace(name_font_face, name_font_size),
				}
				table.insert(option_name_container, option_name)
				table.insert(horizontal_group, option_name_container)
			end

			if self.options[c].widget == "ProgressWidget" then
				local widget_container = CenterContainer:new{
					dimen = Geom:new{w = Screen:getWidth()*self.options[c].widget_align_center, h = option_height}
				}
				local widget = ProgressWidget:new{
					width = self.options[c].width,
					height = self.options[c].height,
					percentage = self.options[c].percentage,
				}
				table.insert(widget_container, widget)
				table.insert(horizontal_group, widget_container)
			end

			local option_items_container = CenterContainer:new{
				dimen = Geom:new{w = Screen:getWidth()*item_align, h = option_height}
			}
			local option_items_group = HorizontalGroup:new{}
			local option_items_fixed = false
			local option_items = {}
			if type(self.options[c].item_font_size) == "table" then
				option_items_group.align = "bottom"
				option_items_fixed = true
			end
			-- make current index according to configurable table
			local current_item = nil
			local function value_diff(val1, val2, name)
				if type(val1) ~= type(val2) then
					error("different data types in option", name)
				end
				if type(val1) == "number" then
					return math.abs(val1 - val2)
				elseif type(val1) == "string" then
					return val1 == val2 and 0 or 1
				end
			end
			if self.options[c].name then
				if self.options[c].values then
					-- check if current value is stored in configurable or calculated in runtime
					local val = self.options[c].current_func and self.options[c].current_func()
								or self.config.configurable[self.options[c].name]
					local min_diff = nil
					if type(val) == "table" then
						min_diff = value_diff(val[1], self.options[c].values[1][1])
					else
						min_diff = value_diff(val, self.options[c].values[1])
					end
						
					local diff = nil
					for index, val_ in pairs(self.options[c].values) do
						local diff = nil
						if type(val) == "table" then
							diff = value_diff(val[1], val_[1])
						else
							diff = value_diff(val, val_)
						end
						if val == val_ then
							current_item = index
							break
						end
						if diff <= min_diff then
							min_diff = diff
							current_item = index
						end
					end
				elseif self.options[c].args then
					-- check if current arg is stored in configurable or calculated in runtime
					local arg = self.options[c].current_func and self.options[c].current_func()
								or self.config.configurable[self.options[c].name]
					for idx, arg_ in pairs(self.options[c].args) do
						if arg_ == arg then
							current_item = idx
							break
						end
					end
				end
			end
			if self.options[c].item_text then
				for d = 1, #self.options[c].item_text do
					local option_item = nil
					if option_items_fixed then
						option_item = OptionTextItem:new{
							FixedTextWidget:new{
								text = self.options[c].item_text[d],
								face = Font:getFace(item_font_face, item_font_size[d]),
							},
							padding = 3,
							color = d == current_item and 15 or 0,
						}
					else
						option_item = OptionTextItem:new{
							TextWidget:new{
								text = self.options[c].item_text[d],
								face = Font:getFace(item_font_face, item_font_size),
							},
							padding = -3,
							color = d == current_item and 15 or 0,
						}
					end
					option_items[d] = option_item
					option_item.items = option_items
					option_item.name = self.options[c].name
					option_item.values = self.options[c].values
					option_item.args = self.options[c].args
					option_item.event = self.options[c].event
					option_item.current_item = d
					option_item.config = self.config
					table.insert(option_items_group, option_item)
					if d ~= #self.options[c].item_text then
						table.insert(option_items_group, items_spacing)
					end
				end
			end

			if self.options[c].item_icons then
				for d = 1, #self.options[c].item_icons do
					local option_item = OptionIconItem:new{
						icon = ImageWidget:new{
							file = self.options[c].item_icons[d]
						},
						padding = -2,
						color = d == current_item and 15 or 0,
					}
					option_items[d] = option_item
					option_item.items = option_items
					option_item.name = self.options[c].name
					option_item.values = self.options[c].values
					option_item.args = self.options[c].args
					option_item.event = self.options[c].event
					option_item.current_item = d
					option_item.config = self.config
					table.insert(option_items_group, option_item)
					if d ~= #self.options[c].item_icons then
						table.insert(option_items_group, items_spacing)
					end
				end
			end

			if self.options[c].toggle then
				local switch = ToggleSwitch:new{
					width = Screen:scaleByDPI(self.options[c].width or 216),
					name = self.options[c].name,
					toggle = self.options[c].toggle,
					alternate = self.options[c].alternate,
					values = self.options[c].values,
					args = self.options[c].args,
					event = self.options[c].event,
					events = self.options[c].events,
					config = self.config,
				}
				local position = current_item
				switch:setPosition(position)
				table.insert(option_items_group, switch)
			end

			table.insert(option_items_container, option_items_group)
			table.insert(horizontal_group, option_items_container)
			table.insert(vertical_group, horizontal_group)
		end -- if
	end -- for
	table.insert(vertical_group, VerticalSpan:new{ width = default_option_padding })
	self[1] = vertical_group
	self.dimen = vertical_group:getSize()
end

local ConfigPanel = FrameContainer:new{ background = 0, bordersize = 0, }
function ConfigPanel:init()
	local config_options = self.config_dialog.config_options
	local default_option = config_options.default_options and config_options.default_options
							or config_options[1].options
	local panel = ConfigOption:new{
		options = self.index and config_options[self.index].options or default_option,
		config = self.config_dialog,
	}
	self.dimen = panel:getSize()
	table.insert(self, panel)
end

local MenuBar = FrameContainer:new{ background = 0, }
function MenuBar:init()
	local config_options = self.config_dialog.config_options
	local menu_items = {}
	local icons_width = 0
	local icons_height = 0
	for c = 1, #config_options do
		local menu_icon = ImageWidget:new{
			file = config_options[c].icon
		}
		local icon_dimen = menu_icon:getSize()
		icons_width = icons_width + icon_dimen.w
		icons_height = icon_dimen.h > icons_height and icon_dimen.h or icons_height

		menu_items[c] = MenuBarItem:new{
			menu_icon,
			index = c,
			config = self.config_dialog,
		}
	end

	local spacing = HorizontalSpan:new{
		width = (Screen:getWidth() - icons_width) / (#menu_items+1)
	}

	local menu_bar = HorizontalGroup:new{}

	for c = 1, #menu_items do
		table.insert(menu_bar, spacing)
		table.insert(menu_bar, menu_items[c])
	end
	table.insert(menu_bar, spacing)

	self.dimen = Geom:new{ w = Screen:getWidth(), h = icons_height}
	table.insert(self, menu_bar)
end

--[[
Widget that displays config menubar and config panel

 +----------------+
 |                |
 |                |
 |                |
 |                |
 |                |
 +----------------+
 |                |
 |  Config Panel  |
 |                |
 +----------------+
 |    Menu Bar    |
 +----------------+

--]]

local ConfigDialog = InputContainer:new{
	--is_borderless = false,
	panel_index = 1,
}

function ConfigDialog:init()
	------------------------------------------
	-- start to set up widget layout ---------
	------------------------------------------
	self.config_menubar = MenuBar:new{
		config_dialog = self,
	}
	self:update()
	------------------------------------------
	-- start to set up input event callback --
	------------------------------------------
	if Device:isTouchDevice() then
		self.ges_events.TapCloseMenu = {
			GestureRange:new{
				ges = "tap",
				range = Geom:new{
					x = 0, y = 0,
					w = Screen:getWidth(),
					h = Screen:getHeight(),
				}
			}
		}
	else
		-- set up keyboard events
		self.key_events.Close = { {"Back"}, doc = _("close config menu") }
		-- we won't catch presses to "Right"
		self.key_events.FocusRight = nil
	end
	self.key_events.Select = { {"Press"}, doc = _("select current menu item") }
end

function ConfigDialog:updateConfigPanel(index)
	
end

function ConfigDialog:update()
	self.config_panel = ConfigPanel:new{
		index = self.panel_index,
		config_dialog = self,
	}
	self.dialog_frame = FrameContainer:new{
		background = 0,
		VerticalGroup:new{
			self.config_panel,
			self.config_menubar,
		},
	}

	self[1] = BottomContainer:new{
		dimen = Screen:getSize(),
		self.dialog_frame,
	}
end

function ConfigDialog:onShowConfigPanel(index)
	self.panel_index = index
	local orig_dimen = self.dialog_frame and self.dialog_frame.dimen or Geom:new{}
	
	self:update()
	
	UIManager.repaint_all = true
	UIManager.full_refresh = true
	UIManager.update_region_func = function()
		local update_region = self.dialog_frame.dimen:combine(orig_dimen)
		DEBUG("update region", update_region)
		return update_region
	end
	return true
end

function ConfigDialog:onConfigChoice(option_name, option_value)
	--DEBUG("config option value", option_name, option_value)
	self.configurable[option_name] = option_value
	self.ui:handleEvent(Event:new("StartActivityIndicator"))
	return true
end

function ConfigDialog:onConfigEvent(option_event, option_arg)
	--DEBUG("config option event", option_event, option_arg)
	self.ui:handleEvent(Event:new(option_event, option_arg))
	return true
end

function ConfigDialog:closeDialog()
	UIManager:close(self)
	if self.close_callback then
		self.close_callback()
	end
	return true
end

function ConfigDialog:onTapCloseMenu(arg, ges_ev)
	if ges_ev.pos:notIntersectWith(self.dialog_frame.dimen) then
		self:closeDialog()
		return true
	end
end

return ConfigDialog