-- TE4 - T-Engine 4
-- Copyright (C) 2009 - 2016 Nicolas Casalini
--
-- This program is free software: you can redistribute it and/or modify
-- it under the terms of the GNU General Public License as published by
-- the Free Software Foundation, either version 3 of the License, or
-- (at your option) any later version.
--
-- This program is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-- GNU General Public License for more details.
--
-- You should have received a copy of the GNU General Public License
-- along with this program.  If not, see <http://www.gnu.org/licenses/>.
--
-- Nicolas Casalini "DarkGod"
-- darkgod@te4.org

require "engine.class"
local Module = require "engine.Module"
local Dialog = require "engine.ui.Dialog"
local Button = require "engine.ui.Button"
local Textbox = require "engine.ui.Textbox"
local Dropdown = require "engine.ui.Dropdown"
local Textzone = require "engine.ui.Textzone"

--- player to player chatbox
-- @classmod engine.dialogs.Talkbox
module(..., package.seeall, class.inherit(Dialog))

function _M:init(chat, on_end, only_friends)
	chat:getChannelCode("----------------")

	self.on_end = on_end
	self.chat = chat
	self.min = 2
	self.max = 300
	self.absolute = absolute
	self.only_friends = self.only_friends

	Dialog.init(self, self:getTitle(), 320, 110, nil, nil, nil, nil, false)

	local c_box = Textbox.new{title="Say: ", text="", chars=60, max_len=max,
		fct=function(text) self:okclick() end,
		on_change = function(text) self:checkTarget(text) end,
	}
	self.c_box = c_box
	local ok = Button.new{text="Accept", fct=function() self:okclick() end}
	local cancel = Button.new{text="Cancel", fct=function() self:cancelclick() end}

	local list = self:getTargets(only_friends)
	if #list == 0 then self.nobody = true end

	if only_friends and #list > 0 then
		local type, name = self.chat:getCurrentTarget()
		if type ~= "whisper" then
			self.chat:setCurrentTarget(false, list[1].id)
		end
	end

	self.c_list_text = Textzone.new{auto_width=true, auto_height=true, text="Target: "}
	self.c_list = Dropdown.new{width=250, fct=function(item) if not item then return end self:checkTarget(item.id..":") self:setFocus(c_box) end, list=list, nb_items=math.min(#list, 10), scrollbar=true}

	self:loadUI{
		{left=0, top=0, ui=self.c_box},

		{left=self.c_box.w - self.c_list.w - self.c_list_text.w - 6, top=self.c_box.h + 10, ui=self.c_list_text},
		{left=self.c_box.w - self.c_list.w, top=self.c_box.h + 10, ui=self.c_list},

		{left=0, bottom=0, ui=ok},
		{left=self.c_box.w - ok.w, bottom=0, ui=cancel},
	}
	self:setFocus(c_box)
	self:setupUI(true, true)

	self:getTitle()

	self.key:addBinds{
		EXIT = function() game:unregisterDialog(self) end,
	}
	self.key:addCommand("_ESCAPE", function() game:unregisterDialog(self) end)
	self.key:addCommand("_TAB", function()
		local type, name = self.chat:getCurrentTarget()
		if type == "whisper" then
			local found = nil
			for i, l in ipairs(self.chat.last_whispers) do if l == name then found = i break end end
			if found then
				found = util.boundWrap(found + 1, 1, #self.chat.last_whispers)
				self.chat:setCurrentTarget(false, self.chat.last_whispers[found])
				self:updateTitle(self:getTitle())
			end
		else
			self:autoComplete()
		end
	end)
end

function _M:on_register()
	self:updateTitle(self:getTitle())
end

function _M:getTargets(only_friends)
	local list = {}
	if not only_friends then
		for name, _ in pairs(self.chat.channels) do list[#list+1] = {name="Channel: "..name, id=name} end
	end

	local name_added = {}
	for login, data in pairs(self.chat.friends) do list[#list+1] = {name="Friend: "..data.name, id=data.name} name_added[data.name] = true end

	if not only_friends and self.chat.channels[self.chat.cur_channel] then
		for login, data in pairs(self.chat.channels[self.chat.cur_channel].users) do if not name_added[data.name] then list[#list+1] = {name="User: "..data.name, id=data.name} name_added[data.name] = true end end
	end
	return list
end

function _M:getTitle()
	local type, name = self.chat:getCurrentTarget()
	if self.c_list then for i = 1, #self.c_list.c_list.list do
		if self.c_list.c_list.list[i].id == name then self.c_list.c_list.sel = i break end
	end end
	if type == "channel" then
		return "Talk on channel: "..name
	elseif type == "whisper" then
		return "Whisper to: "..name
	end
	return "????"
end

function _M:checkTarget(text)
	if text:sub(text:len()) == ":" then
		local name = text:sub(1, text:len() - 1)
		local channel = self.chat:findChannel(name)
		local uname = self.chat:findUser(name)
		if uname then
			self.chat:setCurrentTarget(false, uname or name)
			self:updateTitle(self:getTitle())
			self.c_box:setText("")
		elseif channel then
			self.chat:setCurrentTarget(true, channel)
			self:updateTitle(self:getTitle())
			self.c_box:setText("")
		end
	end
	if text:sub(1, 1) == "/" then
		if text == "/r " and self.chat.last_whispers and self.chat.last_whispers[1] then
			self.chat:setCurrentTarget(false, self.chat.last_whispers[1])
			self:updateTitle(self:getTitle())
			self.c_box:setText("")
		else
			local _, _, chancode = text:find("^/([0-9]+) ")
			chancode = tonumber(chancode)
			if chancode and self.chat.channel_codes_rev and self.chat.channel_codes_rev[chancode] then
				self.chat:setCurrentTarget(true, self.chat.channel_codes_rev[chancode])
				self:updateTitle(self:getTitle())
				self.c_box:setText("")
			end
		end
	end
end

function _M:autoComplete()
	local text, text_len = self.c_box.text, self.c_box.text:len()

	local matches = {}

	-- Try friends
	for k, v in pairs(self.chat.friends) do
		if k:sub(1, text_len) == text then
			matches[#matches+1] = k
		end
	end
	
	-- Try channel users
	if self.chat.channels and self.chat.cur_channel and self.chat.channels[self.chat.cur_channel] then
		for k, v in pairs(self.chat.channels[self.chat.cur_channel].users) do
			if k:sub(1, text_len) == text then
				matches[#matches+1] = k
			end
		end
	end

	if #matches == 1 then
		self.c_box:setText(matches[1])
	elseif #matches > 1 then
		-- Find the longest common substring and complete it
		local substring = matches[1]:sub(#text+1)
		for i=2,#matches do
			local min_len = math.min(#matches[i]-#text, #substring)
			for j=1,min_len do
				if substring:sub(j, j) ~= matches[i]:sub(#text+j, #text+j) then
					substring = substring:sub(1, util.bound(j-1, 0))
					break
				end
			end
			if #substring > 0 then
				self.c_box:setText(text .. substring)
			end
		end
	end
end

function _M:okclick()
	local text = self.c_box.text

	local _, _, command, params = text:find("^/([a-z]+) (.*)$")
	if command then
		if command == "join" and params:find("^[a-z_-]+$") then
			self.chat:join(params)
			self.c_box:setText("")
			game:unregisterDialog(self)
			self.chat:setCurrentTarget(true, params)
			return
		end
		if command == "part" and params:find("^[a-z_-]+$") then
			self.chat:part(params)
			self.c_box:setText("")
			game:unregisterDialog(self)
			self.chat:setCurrentTarget(true, game.__mod_info.short_name)
			return
		end
		self:triggerHook{"Chat:Talkbox:command", command=command, params=params, talkbox=self}
	end

	if text:len() >= self.min and text:len() <= self.max then
		game:unregisterDialog(self)

		local type, name = self.chat:getCurrentTarget()
		if type == "channel" then
			self.chat:talk(text)
		elseif type == "whisper" then
			self.chat:whisper(name, text)
		end

		if self.on_end then self.on_end() end
	end
end

function _M:cancelclick()
	self.key:triggerVirtual("EXIT")
end