local enet = require"enet"
local json = require"common.dkjson"
local utf8 = require"utf8"


local SERVER_HOSTNAME = "ubq323.website"
if os.getenv"HEXEMU_LOCAL" then SERVER_HOSTNAME = "localhost" end

local PLAYER_SIZE = require"common.constants".PLAYER_SIZE
local local_player = nil

local drawing = require"drawing"
local coords = require"common.coords"
local Pos = coords.Pos
local camera = require"camera".Camera:make()
local ChunkC = require"chunk".ChunkC
local util = require"util"
local Map = require"common.map".Map
local movement = require"movement"
local msgbox = require"msgbox"
local drawing2 = require"drawing2"

-- local pprint=require"common.pprint"
-- pprint.setup{show_all=true}

local SCENE = {}

local help_text = [[
controls:
wasd: move
shift: sprint

left mouse: place
right mouse: destroy
mousewheel: zoom in/out

F1: show/hide this help
F3: show/hide debug

enter: toggle chat]]




math.randomseed(os.time())

local map = Map:make()

local host,peer


local selected_tile = 9

-- normal: regular gameplay
-- chat: chat box is open
-- more modes may come
local ui_mode = "normal"

_G.debugmode = false

local show_controls = false

local this_chatmsg = ""
local chatmsg_text = love.graphics.newText(love.graphics.getFont())


function SCENE.keypressed(key,scancode,isrepeat)
	if ui_mode == "normal" then
		if key == "f3" then _G.debugmode = not _G.debugmode end
		if key == "f1" then show_controls = not show_controls end
		for i = 1,9 do if key == tostring(i) then selected_tile = i end end
		if key == "return" then
			ui_mode = "chat"
			this_chatmsg = ""
		end
	elseif ui_mode == "chat" then
		if key == "return" then
			ui_mode = "normal"
			if this_chatmsg:sub(1,3) == "/tp" then
				local x,y = this_chatmsg:match("/tp (%S+) (%S+)")
				if x then
					x,y = tonumber(x),tonumber(y)
					local_player.pos.x=x
					local_player.pos.y=y
					local_player.pos_dirty=true
				end
			else
				peer:send(json.encode{t="chat",msg=this_chatmsg})
			end
			-- msgbox.add("[me] "..this_chatmsg)
		elseif key == "escape" then
			ui_mode = "normal"
		elseif key == "backspace" then
			local boffs = utf8.offset(this_chatmsg,-1)
			if boffs then
				this_chatmsg = this_chatmsg:sub(1,boffs-1)
			end
		end
	end
end

function SCENE.textinput(text)
	if ui_mode == "chat" then
		this_chatmsg = this_chatmsg..text
	end
end

local function draw_player(pl,islocal)
	love.graphics.setColor(pl.color)
	love.graphics.circle("fill",pl.pos.x,pl.pos.y, PLAYER_SIZE)

	if islocal then
		love.graphics.setLineWidth(0.01)
		love.graphics.setColor(0.5,0,0)
		love.graphics.circle("line",pl.pos.x,pl.pos.y,PLAYER_SIZE)
	end

	if pl.username then
		-- think of a better way to unscale but keep transformation
		love.graphics.push()
		love.graphics.translate(pl.pos.x, pl.pos.y)
		love.graphics.scale(1/camera.zoom)
		util.print_good(pl.username, 0, 0)
		love.graphics.pop()
	end
end

local remote_players = {}

local function update_local_player(pl,dt)
	local SPEED = 8*math.sqrt(3) -- 8 hexagonheights per second

	if love.keyboard.isDown("lshift")
			or love.keyboard.isScancodeDown'kpenter' then
		SPEED = SPEED*2
	end
	local function kd(codes)
		for _,code in ipairs(codes) do
			if love.keyboard.isScancodeDown(code) then return 1 end
		end
		return 0
	end
	local dx = kd{"d","kp6"}-kd{"a","kp4"}
	local dy = kd{"s","kp5"}-kd{"w","kp8"}

	if dx == 0 and dy == 0 then
		return
	end

	if dx ~= 0 and dy ~= 0 then
		-- 60degrees direction, to follow hex grid
		-- instead of 45degrees diagonal
		dx = dx * 0.5
		dy = dy * (math.sqrt(3)/2)
	end

	local try_pos = Pos:make(
		pl.pos.x + SPEED*dt*dx,
		pl.pos.y + SPEED*dt*dy
	)
	pl.pos = movement.collide_with_terrain(pl.pos,try_pos,map)
	-- pl.pos = try_pos
	pl.pos_dirty = true
end

local function sync_local_player(pl)
	-- send updated info about local player to server
	if pl.pos_dirty then
		peer:send(json.encode{t="ppos",x=pl.pos.x,y=pl.pos.y},1)
		pl.pos_dirty = false
	end
end

local function send_settile(hpos,tile)
	peer:send(json.encode{t="settile",q=hpos.q,r=hpos.r,tile=tile})
end

function SCENE.wheelmoved(dx,dy)
	camera.zoom = camera.zoom * (1.15 ^ dy)
	camera.zoom = math.max(2.5,math.min(50,camera.zoom))
end


local function handle_net()
	-- handle network packets
	repeat
		local ev = host:service()
		if ev and ev.type == "receive" then
			-- print(ev.data)
			local j = json.decode(ev.data)
			local op = j.t
			-- if op ~= "chunk" then print(ev.channel,ev.data) end
			if op == "join" then
				local pl = j.pl
				remote_players[pl.id] = {
					pos=coords.Pos:make(pl.x,pl.y),
					color=pl.color, id=pl.id,
					username = pl.username,
				}
				msgbox.add(pl.id.." joined")
			elseif op == "leave" then
				local id = j.id
				remote_players[id]=nil
				msgbox.add(id.." left")
			elseif op == "move" then
				local id,x,y = j.id,j.x,j.y
				assert(remote_players[id],"wheeze "..id)
				remote_players[id].pos.x = x
				remote_players[id].pos.y = y
			elseif op == "you" then
				local pl = j.pl
				local_player = {
					pos=coords.Pos:make(pl.x,pl.y),
					color=pl.color, id=pl.id,
					username=pl.username,
				}
			elseif op == "chunk" then
				local ch = ChunkC:from_packet_data(j)
				map:add_chunk(ch)
			elseif op == "settile" then
				local h = coords.Hex:make(j.q,j.r)
				map:set_at(h,j.tile)
			elseif op == "chat" then
				local msg,from = j.msg,j.from
				msgbox.add("["..tostring(from).."] "..msg)
			end
		end
	until not ev
end

local function update(dt)
	msgbox.update(dt)
	if ui_mode == "normal" then
		-- movement
		update_local_player(local_player,dt)
		sync_local_player(local_player)

		-- mouse input (place/mine)
		local msx,msy = love.mouse.getPosition()
		local mh =
			camera:screen_to_world(Pos:make(msx,msy)):to_hex():round()
		if map:at(mh) == 0 and love.mouse.isDown(1) then
			map:set_at(mh,selected_tile)
			send_settile(mh,selected_tile)
		elseif map:at(mh) ~= 0 and love.mouse.isDown(2) then
			map:set_at(mh,0)
			send_settile(mh,0)
		end
	end

	-- load and unload chunks
	local player_cp = local_player.pos:to_hex():containing_chunk()
	-- load chunks near to player (within 3x3 square)
	for _,cp in ipairs(player_cp:neighborhood()) do
		if map:chunk(cp) == nil then
			map:mark_chunk_loading(cp)
			peer:send(json.encode{t="reqchunk",u=cp.u,v=cp.v})
		end
	end
	-- unload chunks not near player
		-- todo maybe: instead of immedately unloading chunks when we
		-- move away, instead have some kind of 'last near' time, so
		-- that if the player is moving back and forth, we don't
		-- repeatedly unload and reload a given chunk.
	local to_remove = {}
	for cp in map:iter_chunks() do
		local d = player_cp:orth_dist(cp)
		if d > 1 then
			map:remove_chunk(cp)
		end
	end

	handle_net()
end

local function draw()
	love.graphics.clear(1,1,1)
	love.graphics.origin()

	camera.pos = local_player.pos
	camera:apply_trans()

	-- drawing.draw_map(camera,map)
	drawing2.draw_map(camera,map)

	draw_player(local_player,true)
	for _,pl in pairs(remote_players) do
		draw_player(pl)
	end

	-- mouse position (resp. screen, world, hex)
	local sm = Pos:make(love.mouse.getPosition())
	local wm = camera:screen_to_world(sm)
	local hm = wm:to_hex()

	-- draw reticle
	local hmr = hm:round()
	local mouse_tile = map:at(hmr)
	if mouse_tile then
		local col = {0.5,0.5,0.5}
		if mouse_tile == 0 then col = {0,0,0} end
		local c = hmr:to_pos()
		local verts = {}
		for i=0,5 do
			local angle = math.pi*2*(i+0.5)/6
			table.insert(verts, c.x+math.cos(angle))
			table.insert(verts, c.y+math.sin(angle))
		end
		love.graphics.setColor(col)
		love.graphics.setLineWidth(0.05)
		love.graphics.polygon("line",verts)
	end


	love.graphics.origin()
	-- selected tile (temp)
	util.print_good(tostring(selected_tile), "center",10)

	local W,H = love.graphics.getDimensions()

	if _G.debugmode and local_player then
		util.print_good(table.concat({
			"ms "..tostring(sm),
			"mw "..tostring(wm),
			"mh "..tostring(hm).." "..tostring(hm:round()),
			"",
			"pw "..tostring(local_player.pos),
			"ph "..tostring(local_player.pos:to_hex()).." "
				..tostring(local_player.pos:to_hex():round()),
			"",
			"voob "..tostring(camera.zoom),
			"",
			"fps "..tostring(love.timer.getFPS()),
			"ping "..tostring(peer:round_trip_time()),
			"",
			"res"..W.."x"..H,
		},"\n"),10,10)
	end

	if show_controls then
		util.print_good(help_text,"center","center")
	end

	msgbox.draw()

	if ui_mode ~= "normal" then
		util.print_good(ui_mode, -20,10)
	end

	if ui_mode == "chat" then
		chatmsg_text:set("- "..this_chatmsg)
		local tw,th = chatmsg_text:getDimensions()
		local y = H-th-30
		love.graphics.setColor(0,0,0,0.8)
		love.graphics.rectangle("fill",0,y,W,th)
		love.graphics.setColor(1,1,1)
		love.graphics.draw(chatmsg_text,0,y)
		love.graphics.setColor(0.8,0.8,0.8)
		love.graphics.line(tw,y,tw,y+th)
	end
end

local connected = false
local sent_hshake = false
local username = nil
function SCENE.update(dt)
	if connected then
		return update(dt)
	else
		handle_net()
		if peer:state() == "connected" and not sent_hshake then
			peer:send(json.encode{t='handshake',username=username})
			sent_hshake = true
		elseif peer:state() == "connected" and local_player then
			connected = true
			msgbox.add("connected to "..SERVER_HOSTNAME..":8473")
			msgbox.add("press F1 for controls help")
		end
	end
end
function SCENE.draw()
	if connected then
		return draw()
	else
		love.graphics.clear(1,1,1)
		love.graphics.print("connecting...",10,10)
	end
end

function SCENE.load(_username)
	love.keyboard.setKeyRepeat(true)
	-- require"profile".start(10,io.open("./trace","w"))
	host = enet.host_create()
	peer = host:connect(SERVER_HOSTNAME..":8473",2)
	username = _username
end

function SCENE.quit()
	-- require"profile".stop()
	peer:disconnect()
	host:flush()
end

return SCENE