mail = {}

mail.highlightedmessages = {}

mail.messages = {}

function mail.load()
	local file = io.open(minetest.get_worldpath().."/mail.db","r")
	if file then
		local data = file:read("*a")
		mail.messages = minetest.deserialize(data)
		file:close()
	end
end

function mail.save()
	local file = io.open(minetest.get_worldpath().."/mail.db","w")
	if file and file:write(minetest.serialize(mail.messages)) and file:close() then
		return true
	else
		minetest.log("error","[mail] Save failed - messages may be lost!")
		return false
	end
end

mail.inboxformspec =    "size[8,9;]"..
			"button_exit[7.5,0;0.5,0.5;quit;X]"..
			"button[6.25,1;1.5,0.5;new;New Message]"..
			"button[6.25,2;1.5,0.5;read;Read]"..
			"button[6.25,3;1.5,0.5;reply;Reply]"..
			"button[6.25,4;1.5,0.5;forward;Forward]"..
			"button[6.25,5;1.5,0.5;delete;Delete]"..
			"button[6.25,6;1.5,0.5;markread;Mark Read]"..
			"button[6.25,7;1.5,0.5;markunread;Mark Unread]"..
			"button[6.25,8;1.5,0.5;about;About]"..
			"textlist[0,0.5;6,8.5;message;"	

function mail.send(src,dst,subject,body)
	if not mail.messages[dst] then mail.messages[dst] = {} end
	table.insert(mail.messages[dst],1,{unread=true,sender=src,subject=subject,body=body})
	for _,player in ipairs(minetest.get_connected_players()) do
		local name = player:get_player_name()
		if name == dst then
			if subject == "" then subject = "(No subject)" end
			minetest.chat_send_player(dst,string.format("You have a new message from %s!. Use the /mail command" .. (minetest.get_modpath("unified_inventory") and " or the mail button in the inventory " or " ") .. "to view it. Subject: %s",src,(string.len(subject) > 30 and string.sub(subject,1,27) .. "..." or subject)))
		end
	end
	mail.save()
end

function mail.showabout(name)
	local formspec =        "size[4,5;]"..
				"button[3.5,0;0.5,0.5;back;X]"..
				"label[0,0;Mail]"..
				"label[0,0.5;By cheapie]"..
				"label[0,1;http://github.com/cheapie/mail]"..
				"label[0,1.5;See LICENSE file for license information]"..
				"label[0,2.5;NOTE: Communication using this system]"..
				"label[0,3;is NOT guaranteed to be private!]"..
				"label[0,3.5;Admins are able to view the messages]"..
				"label[0,4;of any player.]"
	minetest.show_formspec(name,"mail:about",formspec)
end

function mail.showinbox(name)
	local formspec = mail.inboxformspec
	if not mail.messages[name] then mail.messages[name] = {} end
	local idx, message
	if mail.messages[name][1] then
		for idx,message in ipairs(mail.messages[name]) do
			if idx ~= 1 then formspec = formspec .. "," end
			if message.unread then
				formspec = formspec .. "#FF8888"
			end
			formspec = formspec .. "From: " .. minetest.formspec_escape(message.sender) .. " Subject: "
			if message.subject ~= "" then
				if string.len(message.subject) > 30 then
					formspec = formspec .. minetest.formspec_escape(string.sub(message.subject,1,27)).. "..."
				else
					formspec = formspec .. minetest.formspec_escape(message.subject)
				end
			else
				formspec = formspec .. "(No subject)"
			end
		end
		formspec = formspec .. "]label[0,0;Welcome! You've got mail!]"
	else
		formspec = formspec .. "No mail :(]label[0,0;Welcome!]"
	end
	minetest.show_formspec(name,"mail:inbox",formspec)
end

function mail.showmessage(name,msgnumber)
	local message = mail.messages[name][msgnumber]
	local formspec = "size[8,6]button[7.5,0;0.5,0.5;back;X]label[0,0;From: %s]label[0,0.5;Subject: %s]textarea[0.25,1;8,4;body;;%s]button[1,5;2,1;reply;Reply]button[3,5;2,1;forward;Forward]button[5,5;2,1;delete;Delete]"
	local sender = minetest.formspec_escape(message.sender)
	local subject = minetest.formspec_escape(message.subject)
	local body = minetest.formspec_escape(message.body)
	formspec = string.format(formspec,sender,subject,body)
	minetest.show_formspec(name,"mail:message",formspec)
end

function mail.showcompose(name,defaulttgt,defaultsubj,defaultbody)
	local formspec = "size[8,8]field[0.25,0.5;4,1;to;To:;%s]field[0.25,1.5;4,1;subject;Subject:;%s]textarea[0.25,2.5;8,4;body;;%s]button[1,7;2,1;cancel;Cancel]button[7.5,0;0.5,0.5;cancel;X]button[5,7;2,1;send;Send]"
	formspec = string.format(formspec,minetest.formspec_escape(defaulttgt),minetest.formspec_escape(defaultsubj),minetest.formspec_escape(defaultbody))
	minetest.show_formspec(name,"mail:compose",formspec)
end

minetest.register_on_player_receive_fields(function(player,formname,fields)
	if formname == "mail:about" then
		mail.showinbox(player:get_player_name())
	elseif formname == "mail:inbox" then
		local name = player:get_player_name()
		if fields.message then
			local event = minetest.explode_textlist_event(fields.message)
			mail.highlightedmessages[name] = event.index
			if event.type == "DCL" and mail.messages[name][mail.highlightedmessages[name]] then
				mail.messages[name][mail.highlightedmessages[name]].unread = false
				mail.showmessage(name,mail.highlightedmessages[name])
			end
		end
		if fields.read then
			if mail.messages[name][mail.highlightedmessages[name]] then
				mail.messages[name][mail.highlightedmessages[name]].unread = false
				mail.showmessage(name,mail.highlightedmessages[name])
			end
		elseif fields.delete then
			if mail.messages[name][mail.highlightedmessages[name]] then table.remove(mail.messages[name],mail.highlightedmessages[name]) end
			mail.showinbox(name)
			mail.save()
		elseif fields.reply and mail.messages[name][mail.highlightedmessages[name]] then
			local message = mail.messages[name][mail.highlightedmessages[name]]
			local replyfooter = "Type your reply here."..string.char(10)..string.char(10).."--Original message follows--"..string.char(10)..message.body
			mail.showcompose(name,message.sender,"Re: "..message.subject,replyfooter)
		elseif fields.forward and mail.messages[name][mail.highlightedmessages[name]] then
			local message = mail.messages[name][mail.highlightedmessages[name]]
			local fwfooter = "Type your message here."..string.char(10)..string.char(10).."--Original message follows--"..string.char(10)..message.body
			mail.showcompose(name,"","Fw: "..message.subject,fwfooter)
		elseif fields.markread then
			if mail.messages[name][mail.highlightedmessages[name]] then mail.messages[name][mail.highlightedmessages[name]].unread = false end
			mail.showinbox(name)
			mail.save()
		elseif fields.markunread then
			if mail.messages[name][mail.highlightedmessages[name]] then mail.messages[name][mail.highlightedmessages[name]].unread = true end
			mail.showinbox(name)
			mail.save()
		elseif fields.new then
			mail.showcompose(name,"","","Type your message here.")
		elseif fields.quit then
			if minetest.get_modpath("unified_inventory") then
				unified_inventory.set_inventory_formspec(player, "craft")
			end
		elseif fields.about then
			mail.showabout(name)
		end
		return true
	elseif formname == "mail:message" then
		local name = player:get_player_name()
		if fields.back then
			mail.showinbox(name)
		elseif fields.reply then
			local message = mail.messages[name][mail.highlightedmessages[name]]
			local replyfooter = "Type your reply here."..string.char(10)..string.char(10).."--Original message follows--"..string.char(10)..message.body
			mail.showcompose(name,message.sender,"Re: "..message.subject,replyfooter)
		elseif fields.forward then
			local message = mail.messages[name][mail.highlightedmessages[name]]
			local fwfooter = "Type your message here."..string.char(10)..string.char(10).."--Original message follows--"..string.char(10)..message.body
			mail.showcompose(name,"","Fw: "..message.subject,fwfooter)
		elseif fields.delete then
			if mail.messages[name][mail.highlightedmessages[name]] then table.remove(mail.messages[name],mail.highlightedmessages[name]) end
			mail.showinbox(name)
			mail.save()
		end
		return true
	elseif formname == "mail:compose" then
		if fields.send then
			mail.send(player:get_player_name(),fields.to,fields.subject,fields.body)
		end
		mail.showinbox(player:get_player_name())
		return true
	elseif formname == "mail:unreadnag" then
		if fields.yes then
			mail.showinbox(player:get_player_name())
		else
			minetest.chat_send_player(player:get_player_name(),"You can use the /mail command" .. (minetest.get_modpath("unified_inventory") and " or the mail button in the inventory " or " ") .. "to read your messages later.")
		end
		return true
	elseif fields.mail then
		mail.showinbox(player:get_player_name())
	else
		return false
	end
end)
	
if minetest.get_modpath("unified_inventory") then
	unified_inventory.register_button("mail", {
			type = "image",
			image = "mail_button.png",
			tooltip = "Mail"
		})
end

minetest.register_chatcommand("mail",{
	description = "Open the mail interface",
	func = function(name)
		mail.showinbox(name)
	end
	}
)

minetest.register_on_joinplayer(function(player)
	minetest.after(0,function(player)
		local name = player:get_player_name()
		local unreadflag = false
		if mail.messages[name] then
			for _,message in ipairs(mail.messages[name]) do
				if message.unread then unreadflag = true end
			end
		end
		if unreadflag then
			minetest.show_formspec(name,"mail:unreadnag","size[3,2]label[0,0;You have unread messages in your inbox.]label[0,0.5;Go there now?]button[0.5,0.75;2,1;yes;Yes]button_exit[0.5,1.5;2,1;no;No]")
		end
	end,player)
end)

mail.load()