-- Font: 04.jp.org

-- load characters map
local chars_file = io.open(minetest.get_modpath("homedecor").."/characters", "r")
local charmap = {}
local max_chars = 16
if not chars_file then
    print("[signs] E: character map file not found")
else
    while true do
        local char = chars_file:read("*l")
        if char == nil then
            break
        end
        local img = chars_file:read("*l")
        chars_file:read("*l")
        charmap[char] = img
    end
end

local signs = {
    {delta = {x = 0, y = 0, z = 0.399}, yaw = 0},
    {delta = {x = 0.399, y = 0, z = 0}, yaw = math.pi / -2},
    {delta = {x = 0, y = 0, z = -0.399}, yaw = math.pi},
    {delta = {x = -0.399, y = 0, z = 0}, yaw = math.pi / 2},
}

local signs_yard = {
    {delta = {x = 0, y = 0, z = -0.05}, yaw = 0},
    {delta = {x = -0.05, y = 0, z = 0}, yaw = math.pi / -2},
    {delta = {x = 0, y = 0, z = 0.05}, yaw = math.pi},
    {delta = {x = 0.05, y = 0, z = 0}, yaw = math.pi / 2},
}

local signs_post = {
    {delta = {x = 0, y = 0, z = -0.226}, yaw = 0},
    {delta = {x = -0.226, y = 0, z = 0}, yaw = math.pi / -2},
    {delta = {x = 0, y = 0, z = 0.226}, yaw = math.pi},
    {delta = {x = 0.226, y = 0, z = 0}, yaw = math.pi / 2},
}

local sign_groups = {choppy=2, dig_immediate=2}

local fences_with_sign = { }

homedecor_construct_sign = function(pos)
    local meta = minetest.env:get_meta(pos)
	meta:set_string("formspec", "field[text;;${text}]")
	meta:set_string("infotext", "")
end

homedecor_destruct_sign = function(pos)
    local objects = minetest.env:get_objects_inside_radius(pos, 0.5)
    for _, v in ipairs(objects) do
        if v:get_entity_name() == "signs:text" then
            v:remove()
        end
    end
end

homedecor_update_sign = function(pos, fields)
    local meta = minetest.env:get_meta(pos)
	meta:set_string("infotext", "")
	if fields then
		meta:set_string("text", fields.text)
	end
    local text = meta:get_string("text")
    local objects = minetest.env:get_objects_inside_radius(pos, 0.5)
    for _, v in ipairs(objects) do
        if v:get_entity_name() == "signs:text" then
            v:set_properties({textures={homedecor_generate_texture(homedecor_create_lines(text))}})
			return
        end
    end
	
	-- if there is no entity
	local sign_info
	if minetest.env:get_node(pos).name == "signs:sign_yard" then
		sign_info = signs_yard[minetest.env:get_node(pos).param2 + 1]
	elseif minetest.env:get_node(pos).name == "default:sign_wall" then
		sign_info = signs[minetest.env:get_node(pos).param2 + 1]
	elseif minetest.env:get_node(pos).name == "signs:sign_post" then
		sign_info = signs_post[minetest.env:get_node(pos).param2 + 1]
	end
	if sign_info == nil then
		return
	end
	local text = minetest.env:add_entity({x = pos.x + sign_info.delta.x,
										y = pos.y + sign_info.delta.y,
										z = pos.z + sign_info.delta.z}, "signs:text")
	text:setyaw(sign_info.yaw)
end

minetest.register_node(":default:sign_wall", {
    description = "Sign",
    inventory_image = "default_sign_wall.png",
    wield_image = "default_sign_wall.png",
    node_placement_prediction = "",
    paramtype = "light",
	sunlight_propagates = true,
    paramtype2 = "facedir",
    drawtype = "nodebox",
    node_box = {type = "fixed", fixed = {-0.45, -0.15, 0.4, 0.45, 0.45, 0.498}},
    selection_box = {type = "fixed", fixed = {-0.45, -0.15, 0.4, 0.45, 0.45, 0.498}},
    tiles = {"signs_top.png", "signs_bottom.png", "signs_side.png", "signs_side.png", "signs_back.png", "signs_front.png"},
    groups = sign_groups,

    on_place = function(itemstack, placer, pointed_thing)
	local node=minetest.env:get_node(pointed_thing.under)
	if minetest.registered_nodes[node.name].on_rightclick then
		return minetest.registered_nodes[node.name].on_rightclick(pointed_thing.under, node, placer)
		
	else
		local above = pointed_thing.above
		local under = pointed_thing.under
		local dir = {x = under.x - above.x,
		             y = under.y - above.y,
		             z = under.z - above.z}

		local wdir = minetest.dir_to_wallmounted(dir)

		local placer_pos = placer:getpos()
		if placer_pos then
		    dir = {
		        x = above.x - placer_pos.x,
		        y = above.y - placer_pos.y,
		        z = above.z - placer_pos.z
		    }
		end

		local fdir = minetest.dir_to_facedir(dir)

		local sign_info
		local pt_name = minetest.env:get_node(under).name
		print(dump(pt_name))

		if fences_with_sign[pt_name] then
		    minetest.env:add_node(under, {name = fences_with_sign[pt_name], param2 = fdir})
		    sign_info = signs_post[fdir + 1]

		elseif wdir == 0 then
		    --how would you add sign to ceiling?
		    minetest.env:add_item(above, "default:sign_wall")
				itemstack:take_item()
				return itemstack
		elseif wdir == 1 then
		    minetest.env:add_node(above, {name = "signs:sign_yard", param2 = fdir})
		    sign_info = signs_yard[fdir + 1]
		else
		    minetest.env:add_node(above, {name = "default:sign_wall", param2 = fdir})
		    sign_info = signs[fdir + 1]
		end

		local text = minetest.env:add_entity({x = above.x + sign_info.delta.x,
		                                      y = above.y + sign_info.delta.y,
		                                      z = above.z + sign_info.delta.z}, "signs:text")
		text:setyaw(sign_info.yaw)

		itemstack:take_item()
		return itemstack
	end
    end,
    on_construct = function(pos)
        homedecor_construct_sign(pos)
    end,
    on_destruct = function(pos)
        homedecor_destruct_sign(pos)
    end,
    on_receive_fields = function(pos, formname, fields, sender)
        homedecor_update_sign(pos, fields)
    end,
    on_punch = function(pos, node, puncher)
	    homedecor_update_sign(pos)
    end,
})

minetest.register_node(":signs:sign_yard", {
    paramtype = "light",
	sunlight_propagates = true,
    paramtype2 = "facedir",
    drawtype = "nodebox",
    node_box = {type = "fixed", fixed = {
        {-0.45, -0.15, -0.049, 0.45, 0.45, 0.049},
        {-0.05, -0.5, -0.049, 0.05, -0.15, 0.049}
    }},
    selection_box = {type = "fixed", fixed = {-0.45, -0.15, -0.049, 0.45, 0.45, 0.049}},
    tiles = {"signs_top.png", "signs_bottom.png", "signs_side.png", "signs_side.png", "signs_back.png", "signs_front.png"},
    groups = {choppy=2, dig_immediate=2},
    drop = "default:sign_wall",

    on_construct = function(pos)
        homedecor_construct_sign(pos)
    end,
    on_destruct = function(pos)
        homedecor_destruct_sign(pos)
    end,
    on_receive_fields = function(pos, formname, fields, sender)
        homedecor_update_sign(pos, fields)
    end,
	on_punch = function(pos, node, puncher)
		homedecor_update_sign(pos)
	end,
})

minetest.register_node(":signs:sign_post", {
    paramtype = "light",
	sunlight_propagates = true,
    paramtype2 = "facedir",
    drawtype = "nodebox",
    node_box = {
	type = "fixed",
	fixed = { 
		{ -0.125, -0.5, -0.125, 0.125, 0.5, 0.125 },
		{ -0.45, -0.15, -0.225, 0.45, 0.45, -0.125 },
	}
    },
    selection_box = {
	type = "fixed",
	fixed = { 
		{ -0.125, -0.5, -0.125, 0.125, 0.5, 0.125 },
		{ -0.45, -0.15, -0.225, 0.45, 0.45, -0.125 },
	}
    },
    tiles = {
	"signs_post_top.png",
	"signs_post_bottom.png",
	"signs_post_side.png",
	"signs_post_side.png",
	"signs_post_back.png",
	"signs_post_front.png",
    },
    groups = {choppy=2, dig_immediate=2},
    drop = {
	max_items = 2,
	items = {
		{ items = { "default:sign_wall" }},
		{ items = { "default:fence_wood" }},
	},
    },
})


minetest.register_entity(":signs:text", {
    collisionbox = { 0, 0, 0, 0, 0, 0 },
    visual = "upright_sprite",
    textures = {},

    on_activate = function(self)
        local meta = minetest.env:get_meta(self.object:getpos())
        local text = meta:get_string("text")
        self.object:set_properties({textures={homedecor_generate_texture(homedecor_create_lines(text))}})
    end
})

-- CONSTANTS
local SIGN_WITH = 110
local SIGN_PADDING = 8

local LINE_LENGTH = 16
local NUMBER_OF_LINES = 4

local LINE_HEIGHT = 14
local CHAR_WIDTH = 5

homedecor_string_to_array = function(str)
	local tab = {}
	for i=1,string.len(str) do
		table.insert(tab, string.sub(str, i,i))
	end
	return tab
end

homedecor_string_to_word_array = function(str)
	local tab = {}
	local current = 1
	tab[1] = ""
	for _,char in ipairs(homedecor_string_to_array(str)) do
		if char ~= " " then
			tab[current] = tab[current]..char
		else
			current = current+1
			tab[current] = ""
		end
	end
	return tab
end

homedecor_create_lines = function(text)
	local line = ""
	local line_num = 1
	local tab = {}
	for _,word in ipairs(homedecor_string_to_word_array(text)) do
		if string.len(line)+string.len(word) < LINE_LENGTH and word ~= "|" then
			if line ~= "" then
				line = line.." "..word
			else
				line = word
			end
		else
			table.insert(tab, line)
			if word ~= "|" then
				line = word
			else
				line = ""
			end
			line_num = line_num+1
			if line_num > NUMBER_OF_LINES then
				return tab
			end
		end
	end
	table.insert(tab, line)
	return tab
end

homedecor_generate_texture = function(lines)
    local texture = "[combine:"..SIGN_WITH.."x"..SIGN_WITH
    local ypos = 12
    for i = 1, #lines do
        texture = texture..homedecor_generate_line(lines[i], ypos)
        ypos = ypos + LINE_HEIGHT
    end
    return texture
end

homedecor_generate_line = function(s, ypos)
    local i = 1
    local parsed = {}
    local width = 0
    local chars = 0
    while chars < max_chars and i <= #s do
        local file = nil
        if charmap[s:sub(i, i)] ~= nil then
            file = charmap[s:sub(i, i)]
            i = i + 1
        elseif i < #s and charmap[s:sub(i, i + 1)] ~= nil then
            file = charmap[s:sub(i, i + 1)]
            i = i + 2
        else
            print("[signs] W: unknown symbol in '"..s.."' at "..i.." (probably "..s:sub(i, i)..")")
            i = i + 1
        end
        if file ~= nil then
            width = width + CHAR_WIDTH
            table.insert(parsed, file)
            chars = chars + 1
        end
    end
    width = width - 1

    local texture = ""
    local xpos = math.floor((SIGN_WITH - 2 * SIGN_PADDING - width) / 2 + SIGN_PADDING)
    for i = 1, #parsed do
        texture = texture..":"..xpos..","..ypos.."="..parsed[i]..".png"
        xpos = xpos + CHAR_WIDTH + 1
    end
    return texture
end

local function copy ( t )
    local nt = { };
    for k, v in pairs(t) do
        if type(v) == "table" then
            nt[k] = copy(v)
        else
            nt[k] = v
        end
    end
    return nt
end

function homedecor_register_fence_with_sign(fencename, fencewithsignname)
    local def = copy(minetest.registered_nodes[fencename])
    local def_sign = copy(minetest.registered_nodes[fencewithsignname])
    if not (def and def_sign) then
        error("Attempt to register unknown node as fence")
    end
    fences_with_sign[fencename] = fencewithsignname
    def.on_place = function(itemstack, placer, pointed_thing, ...)
		if not homedecor_node_is_owned(pointed_thing.under, placer) then
			local fdir = minetest.dir_to_facedir(placer:get_look_dir())
			minetest.env:add_node(pointed_thing.above, {name = fencename, param2 = fdir})
			itemstack:take_item()
			placer:set_wielded_item(itemstack)
			return itemstack
		end
	end
	def_sign.on_construct = function(pos, ...)
		homedecor_construct_sign(pos)
	end
	def_sign.on_destruct = function(pos, ...)
		homedecor_destruct_sign(pos)
	end
	def_sign.on_receive_fields = function(pos, formname, fields, sender, ...)
		homedecor_update_sign(pos, fields)
	end
	def_sign.on_punch = function(pos, node, puncher, ...)
		homedecor_update_sign(pos)
	end
	local fencename = fencename
	def_sign.after_dig_node = function(pos, node, ...)
	    node.name = fencename
	    minetest.env:add_node(pos, node)
	end
    def_sign.drop = "default:sign_wall"
	minetest.register_node(":"..fencename, def)
	minetest.register_node(":"..fencewithsignname, def_sign)
	print("Registered "..fencename.." and "..fencewithsignname)
end

if minetest.setting_get("log_mods") then
	minetest.log("action", "signs loaded")
end