local n = peripheral.find "neuralInterface"

if not n then error "run on neural interface" end

if not n.hasModule "plethora:glasses" then error "needs overlay glasses" end
if not n.hasModule "plethora:sensor" or not n.hasModule "plethora:introspection" or not n.getMetaOwner then error "needs entity sensor + bound introspection module" end

local itemDB    = require('core.itemDB')
local Schematic = require('builder.schematic')
local TableDB   = require('core.tableDB')
local Util      = require('util')

local colors     = _G.colors
local fs         = _G.fs

local BUILDER_DIR = 'usr/builder'

local Builder = require('builder.builder')

Builder.schematic = Schematic()

local function convertSingleBack(item)
  if item then
    item.id = item.name
    item.dmg = item.damage
    item.qty = item.count
    item.max_size = item.maxCount
    item.display_name = item.displayName
  end
  return item
end

local function convertBack(t)
  for _,v in pairs(t) do
    convertSingleBack(v)
  end
  return t
end

--[[-- SubDB --]]--
local subDB = TableDB({
  fileName = fs.combine(BUILDER_DIR, 'sub.db'),
})

function subDB:load()
  if fs.exists(self.fileName) then
    TableDB.load(self)
  elseif not Builder.isCommandComputer then
    self:seedDB()
  end
end

function subDB:seedDB()
  self.data = {
    [ "minecraft:redstone_wire:0"        ] = "minecraft:redstone:0",
    [ "minecraft:wall_sign:0"            ] = "minecraft:sign:0",
    [ "minecraft:standing_sign:0"        ] = "minecraft:sign:0",
    [ "minecraft:potatoes:0"             ] = "minecraft:potato:0",
    [ "minecraft:unlit_redstone_torch:0" ] = "minecraft:redstone_torch:0",
    [ "minecraft:powered_repeater:0"     ] = "minecraft:repeater:0",
    [ "minecraft:unpowered_repeater:0"   ] = "minecraft:repeater:0",
    [ "minecraft:carrots:0"              ] = "minecraft:carrot:0",
    [ "minecraft:cocoa:0"                ] = "minecraft:dye:3",
    [ "minecraft:unpowered_comparator:0" ] = "minecraft:comparator:0",
    [ "minecraft:powered_comparator:0"   ] = "minecraft:comparator:0",
    [ "minecraft:piston_head:0"          ] = "minecraft:air:0",
    [ "minecraft:piston_extension:0"     ] = "minecraft:air:0",
    [ "minecraft:portal:0"               ] = "minecraft:air:0",
    [ "minecraft:double_wooden_slab:0"   ] = "minecraft:planks:0",
    [ "minecraft:double_wooden_slab:1"   ] = "minecraft:planks:1",
    [ "minecraft:double_wooden_slab:2"   ] = "minecraft:planks:2",
    [ "minecraft:double_wooden_slab:3"   ] = "minecraft:planks:3",
    [ "minecraft:double_wooden_slab:4"   ] = "minecraft:planks:4",
    [ "minecraft:double_wooden_slab:5"   ] = "minecraft:planks:5",
    [ "minecraft:lit_redstone_lamp:0"    ] = "minecraft:redstone_lamp:0",
    [ "minecraft:double_stone_slab:1"    ] = "minecraft:sandstone:0",
    [ "minecraft:double_stone_slab:2"    ] = "minecraft:planks:0",
    [ "minecraft:double_stone_slab:3"    ] = "minecraft:cobblestone:0",
    [ "minecraft:double_stone_slab:4"    ] = "minecraft:brick_block:0",
    [ "minecraft:double_stone_slab:5"    ] = "minecraft:stonebrick:0",
    [ "minecraft:double_stone_slab:6"    ] = "minecraft:nether_brick:0",
    [ "minecraft:double_stone_slab:7"    ] = "minecraft:quartz_block:0",
    [ "minecraft:double_stone_slab:9"    ] = "minecraft:sandstone:2",
    [ "minecraft:double_stone_slab2:0"   ] = "minecraft:sandstone:0",
    [ "minecraft:stone_slab:2"           ] = "minecraft:wooden_slab:0",
    [ "minecraft:wheat:0"                ] = "minecraft:wheat_seeds:0",
    [ "minecraft:flowing_water:0"        ] = "minecraft:air:0",
    [ "minecraft:lit_furnace:0"          ] = "minecraft:furnace:0",
    [ "minecraft:wall_banner:0"          ] = "minecraft:banner:0",
    [ "minecraft:standing_banner:0"      ] = "minecraft:banner:0",
    [ "minecraft:tripwire:0"             ] = "minecraft:string:0",
    [ "minecraft:pumpkin_stem:0"         ] = "minecraft:pumpkin_seeds:0",
  }
  self.dirty = true
  self:flush()
end

function subDB:add(s)
  TableDB.add(self, { s.id, s.dmg }, table.concat({ s.sid, s.sdmg }, ':'))
  self:flush()
end

function subDB:remove(s)
  -- TODO: tableDB.remove should take table key
  TableDB.remove(self, s.id .. ':' .. s.dmg)
  self:flush()
end

function subDB:extract(s)
  local id, dmg = s:match('(.+):(%d+)')
  return id, tonumber(dmg)
end

function subDB:getSubstitutedItem(id, dmg)
  local sub = TableDB.get(self, { id, dmg })
  if sub then
    id, dmg = self:extract(sub)
  end
  return { id = id, dmg = dmg }
end

function subDB:lookupBlocksForSub(sid, sdmg)
  local t = { }
  for k,v in pairs(self.data) do
    local id, dmg = self:extract(v)
    if id == sid and dmg == sdmg then
      id, dmg = self:extract(k)
      t[k] = { id = id, dmg = dmg, sid = sid, sdmg = sdmg }
    end
  end
  return t
end

--[[-- startup logic --]]--
local args = {...}
if #args < 1 then
  error('supply file name')
end

subDB:load()

print('Loading schematic')
Builder.schematic:load(args[1])
print('Substituting blocks')

Builder.subDB = subDB
Builder:substituteBlocks(Util.throttle())

local cn = n.canvas3d().create()

local pos = n.getMetaOwner().withinBlock
cn.recenter({-pos.x, -pos.y, -pos.z})
for i = 1, #Builder.schematic.blocks do
  b = Builder.schematic:getComputedBlock(i)
  if b.id ~= "minecraft:air" then
    cn.addBox(b.x, b.y-10, b.z, 0xffffff40).setDepthTested(false)
  end
end

pcall(read)
cn.clear()