local max_charge = {50000, 200000, 650000}
local power_usage_per_node = {200, 500, 800}

local S = technic.getter

minetest.register_craft({
	output = 'technic:mining_drill',
	recipe = {
		{'default:tin_ingot',             'technic:diamond_drill_head', 'default:tin_ingot'},
		{'technic:stainless_steel_ingot', 'basic_materials:motor',              'technic:stainless_steel_ingot'},
		{'',                              'technic:red_energy_crystal', 'default:copper_ingot'},
	}
})
minetest.register_craft({
	output = 'technic:mining_drill_mk2',
	recipe = {
		{'technic:diamond_drill_head',    'technic:diamond_drill_head',   'technic:diamond_drill_head'},
		{'technic:stainless_steel_ingot', 'technic:mining_drill',         'technic:stainless_steel_ingot'},
		{'',                              'technic:green_energy_crystal', ''},
	}
})
minetest.register_craft({
	output = 'technic:mining_drill_mk3',
	recipe = {
		{'technic:diamond_drill_head',    'technic:diamond_drill_head',  'technic:diamond_drill_head'},
		{'technic:stainless_steel_ingot', 'technic:mining_drill_mk2',    'technic:stainless_steel_ingot'},
		{'',                              'technic:blue_energy_crystal', ''},
	}
})
for i = 1, 4 do
	minetest.register_craft({
		output = 'technic:mining_drill_mk3',
		recipe = {
			{'technic:diamond_drill_head',    'technic:diamond_drill_head',   'technic:diamond_drill_head'},
			{'technic:stainless_steel_ingot', 'technic:mining_drill_mk2_'..i, 'technic:stainless_steel_ingot'},
			{'',                              'technic:blue_energy_crystal',  ''},
		}
	})
end

local mining_drill_mode_text = {
	{S("Single node.")},
	{S("3 nodes deep.")},
	{S("3 nodes wide.")},
	{S("3 nodes tall.")},
	{S("3x3 nodes.")},
}

local function drill_dig_it0 (pos,player)
	if minetest.is_protected(pos, player:get_player_name()) then
		minetest.record_protection_violation(pos, player:get_player_name())
		return
	end
	local node = minetest.get_node(pos)
	if node.name == "air" or node.name == "ignore" then return end
	if node.name == "default:lava_source" then return end
	if node.name == "default:lava_flowing" then return end
	if node.name == "default:water_source" then minetest.remove_node(pos) return end
	if node.name == "default:water_flowing" then minetest.remove_node(pos) return end
	local def = minetest.registered_nodes[node.name]
	if not def then return end
	def.on_dig(pos, node, player)
end

local function drill_dig_it1 (player)
	local dir=player:get_look_dir()
	if math.abs(dir.x)>math.abs(dir.z) then
		if dir.x>0 then return 0 end
		return 1
	end
	if dir.z>0 then return 2 end
	return 3
end

local function drill_dig_it2 (pos,player)
	pos.y=pos.y+1
	drill_dig_it0 (pos,player)
	pos.z=pos.z+1
	drill_dig_it0 (pos,player)
	pos.z=pos.z-2
	drill_dig_it0 (pos,player)
	pos.z=pos.z+1
	pos.y=pos.y-1
	drill_dig_it0 (pos,player)
	pos.z=pos.z+1
	drill_dig_it0 (pos,player)
	pos.z=pos.z-2
	drill_dig_it0 (pos,player)
	pos.z=pos.z+1
	pos.y=pos.y-1
	drill_dig_it0 (pos,player)
	pos.z=pos.z+1
	drill_dig_it0 (pos,player)
	pos.z=pos.z-2
	drill_dig_it0 (pos,player)
end

local function drill_dig_it3 (pos,player)
	pos.y=pos.y+1
	drill_dig_it0 (pos,player)
	pos.x=pos.x+1
	drill_dig_it0 (pos,player)
	pos.x=pos.x-2
	drill_dig_it0 (pos,player)
	pos.x=pos.x+1
	pos.y=pos.y-1
	drill_dig_it0 (pos,player)
	pos.x=pos.x+1
	drill_dig_it0 (pos,player)
	pos.x=pos.x-2
	drill_dig_it0 (pos,player)
	pos.x=pos.x+1
	pos.y=pos.y-1
	drill_dig_it0 (pos,player)
	pos.x=pos.x+1
	drill_dig_it0 (pos,player)
	pos.x=pos.x-2
	drill_dig_it0 (pos,player)
end

local function drill_dig_it4 (pos,player)
	drill_dig_it0 (pos,player)
	pos.x=pos.x+1
	drill_dig_it0 (pos,player)
	pos.x=pos.x-2
	drill_dig_it0 (pos,player)
	pos.x=pos.x+1
	pos.z=pos.z+1
	drill_dig_it0 (pos,player)
	pos.x=pos.x+1
	drill_dig_it0 (pos,player)
	pos.x=pos.x-2
	drill_dig_it0 (pos,player)
	pos.x=pos.x+1
	pos.z=pos.z-2
	drill_dig_it0 (pos,player)
	pos.x=pos.x+1
	drill_dig_it0 (pos,player)
	pos.x=pos.x-2
	drill_dig_it0 (pos,player)
end

local function cost_to_use(drill_type, mode)
	local mult
	if mode == 1 then
		mult = 1
	elseif mode <= 4 then
		mult = 3
	else
		mult = 9
	end
	return power_usage_per_node[drill_type] * mult
end

local function drill_dig_it(pos, player, mode)
	if mode == 1 then
		drill_dig_it0(pos, player)
	end

	if mode == 2 then -- 3 deep
		local dir = drill_dig_it1(player)
		if dir == 0 then -- x+
			drill_dig_it0(pos, player)
			pos.x = pos.x + 1
			drill_dig_it0(pos, player)
			pos.x = pos.x + 1
			drill_dig_it0(pos, player)
		end
		if dir == 1 then  -- x-
			drill_dig_it0(pos, player)
			pos.x=pos.x-1
			drill_dig_it0 (pos,player)
			pos.x=pos.x-1
			drill_dig_it0 (pos,player)
		end
		if dir==2 then  -- z+
			drill_dig_it0 (pos,player)
			pos.z=pos.z+1
			drill_dig_it0 (pos,player)
			pos.z=pos.z+1
			drill_dig_it0 (pos,player)
		end
		if dir==3 then  -- z-
			drill_dig_it0 (pos,player)
			pos.z=pos.z-1
			drill_dig_it0 (pos,player)
			pos.z=pos.z-1
			drill_dig_it0 (pos,player)
		end
	end

	if mode==3 then -- 3 wide
		local dir = drill_dig_it1(player)
		if dir==0 or dir==1 then -- x
			drill_dig_it0 (pos,player)
			pos.z=pos.z+1
			drill_dig_it0 (pos,player)
			pos.z=pos.z-2
			drill_dig_it0 (pos,player)
		end
		if dir==2 or dir==3 then  -- z
			drill_dig_it0 (pos,player)
			pos.x=pos.x+1
			drill_dig_it0 (pos,player)
			pos.x=pos.x-2
			drill_dig_it0 (pos,player)
		end
	end

	if mode==4 then -- 3 tall, selected in the middle
		drill_dig_it0 (pos,player)
		pos.y=pos.y-1
		drill_dig_it0 (pos,player)
		pos.y=pos.y-1
		drill_dig_it0 (pos,player)
	end

	if mode==5 then -- 3 x 3
		local dir=player:get_look_dir()
		if math.abs(dir.y)<0.5 then
			dir=drill_dig_it1(player)
				if dir==0 or dir==1 then -- x
					drill_dig_it2(pos,player)
				end
				if dir==2 or dir==3 then  -- z
					drill_dig_it3(pos,player)
				end
		else
		drill_dig_it4(pos,player)
		end
	end

	minetest.sound_play("mining_drill", {pos = pos, gain = 1.0, max_hear_distance = 10,})
end

local function pos_is_pointable(pos)
	local node = minetest.get_node(pos)
	local nodedef = minetest.registered_nodes[node.name]
	return nodedef and nodedef.pointable
end

local function mining_drill_mkX_setmode(user, itemstack, drill_type, max_modes)
	local player_name = user:get_player_name()
	local meta = minetest.deserialize(itemstack:get_metadata()) or {}

	if not meta["mode"] then
		minetest.chat_send_player(player_name,
			S("Use while sneaking to change Mining Drill Mk%d modes."):format(drill_type))
	end
	local mode = (meta["mode"] or 0) + 1
	if mode > max_modes then mode = 1 end

	minetest.chat_send_player(player_name,
		S("Mining Drill Mk%d Mode %d"):format(2, mode)..
		": "..mining_drill_mode_text[mode][1])
    itemstack:set_name(("technic:mining_drill_mk%d_%s"):format(drill_type, mode))
	meta["mode"] = mode
    itemstack:set_metadata(minetest.serialize(meta))
	return itemstack
end

local function mining_drill_mkX_handler(itemstack, user, pointed_thing, drill_type, max_modes)
	local keys = user:get_player_control()
	local meta = minetest.deserialize(itemstack:get_metadata()) or {}

	-- Mode switching (if possible)
	if max_modes > 1 then
		if not meta.mode or keys.sneak then
			return mining_drill_mkX_setmode(user, itemstack, drill_type, max_modes)
		end
	end
	if pointed_thing.type ~= "node" or not pos_is_pointable(pointed_thing.under) then
		return
	end
	if not meta.charge then
		return
	end

	-- Check whether the tool has enough charge
	local charge_to_take = cost_to_use(drill_type, meta.mode or 1)
	if meta.charge < charge_to_take then
		return
	end

	-- Do the actual shoorting action
	local pos = minetest.get_pointed_thing_position(pointed_thing, false)
	drill_dig_it(pos, user, meta.mode)
	if not technic.creative_mode then
		meta.charge = meta.charge - charge_to_take
		itemstack:set_metadata(minetest.serialize(meta))
		technic.set_RE_wear(itemstack, meta.charge, max_charge[drill_type])
	end
	return itemstack
end

-- Simple mining drill registration

technic.register_power_tool("technic:mining_drill", max_charge[1])

minetest.register_tool("technic:mining_drill", {
	description = S("Mining Drill Mk%d"):format(1),
	inventory_image = "technic_mining_drill.png",
	stack_max = 1,
	wear_represents = "technic_RE_charge",
	on_refill = technic.refill_RE_charge,
	on_use = function(itemstack, user, pointed_thing)
		mining_drill_mkX_handler(itemstack, user, pointed_thing, 1, 1)
		return itemstack
	end,
})

-- Mk2 registration

minetest.register_tool("technic:mining_drill_mk2", {
	description = S("Mining Drill Mk%d"):format(2),
	inventory_image = "technic_mining_drill_mk2.png",
	wear_represents = "technic_RE_charge",
	on_refill = technic.refill_RE_charge,
	on_use = function(itemstack, user, pointed_thing)
		mining_drill_mkX_handler(itemstack, user, pointed_thing, 2, 4)
		return itemstack
	end,
})

technic.register_power_tool("technic:mining_drill_mk2", max_charge[2])

for i = 1, 4 do
	technic.register_power_tool("technic:mining_drill_mk2_"..i, max_charge[2])
	minetest.register_tool("technic:mining_drill_mk2_"..i, {
		description = S("Mining Drill Mk%d Mode %d"):format(2, i),
		inventory_image = "technic_mining_drill_mk2.png^technic_tool_mode"..i..".png",
		wield_image = "technic_mining_drill_mk2.png",
		wear_represents = "technic_RE_charge",
		on_refill = technic.refill_RE_charge,
		groups = {not_in_creative_inventory=1},
		on_use = function(itemstack, user, pointed_thing)
			mining_drill_mkX_handler(itemstack, user, pointed_thing, 2, 4)
			return itemstack
		end,
	})
end

-- Mk3 registration

minetest.register_tool("technic:mining_drill_mk3", {
	description = S("Mining Drill Mk%d"):format(3),
	inventory_image = "technic_mining_drill_mk3.png",
	wear_represents = "technic_RE_charge",
	on_refill = technic.refill_RE_charge,
	on_use = function(itemstack, user, pointed_thing)
		mining_drill_mkX_handler(itemstack, user, pointed_thing, 3, 5)
		return itemstack
	end,
})

technic.register_power_tool("technic:mining_drill_mk3", max_charge[3])

for i=1,5,1 do
	technic.register_power_tool("technic:mining_drill_mk3_"..i, max_charge[3])
	minetest.register_tool("technic:mining_drill_mk3_"..i, {
		description = S("Mining Drill Mk%d Mode %d"):format(3, i),
		inventory_image = "technic_mining_drill_mk3.png^technic_tool_mode"..i..".png",
		wield_image = "technic_mining_drill_mk3.png",
		wear_represents = "technic_RE_charge",
		on_refill = technic.refill_RE_charge,
		groups = {not_in_creative_inventory=1},
		on_use = function(itemstack, user, pointed_thing)
			mining_drill_mkX_handler(itemstack, user, pointed_thing, 3, 5)
			return itemstack
		end,
	})
end