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-----------------------------
-- global turtle functions --
-----------------------------
if not turtle then
    return
end
 
local valid_fuel = {
    "minecraft:charcoal",
    "minecraft:coal",
}
 
local DO_NOT_MINE = {
    "forbidden_arcanus:stella_arcanum",
    "minecraft:diamond_ore",
    "mysticalworld:amethyst_ore",
}
 
NORTH = 0
EAST = 1
SOUTH = 2
WEST = 3
LEFT = 4
RIGHT = 5
 
turtle.x = 0
turtle.y = 0
turtle.z = 0
turtle.dz = -1
turtle.dx = 0
 
local forward =   turtle.forward
local back =      turtle.back
local up =        turtle.up
local down =      turtle.down
local turnLeft =  turtle.turnLeft
local turnRight = turtle.turnRight
 
function turtle.reverseDir( direction )
    if     direction == "forward" then return "back"
    elseif direction == "down"    then return "up"
    elseif direction == "back"    then return "forward"
    elseif direction == "up"      then return "down"
    end
    error( "turtle.reverseDir invalid direction!" )
end
 
function turtle.position()
    return vector.new( x, y, z )
end
 
function turtle.facing()
    if     dz == -1 and dx ==  0 then return NORTH
    elseif dz ==  0 and dx == -1 then return WEST
    elseif dz ==  0 and dx ==  1 then return EAST
    elseif dz ==  1 and dx ==  0 then return SOUTH
    end
    error( "turtle.facing invalid direction!" )
end
 
-- settings -- 
function turtle.load_position()
    local position = settings.get( "position" )
    
    if position then
        turtle.x = position[ 1 ].x or 0
        turtle.y = position[ 1 ].y or 0
        turtle.z = position[ 1 ].z or 0
        turtle.dz = position[ 2 ] or -1
        turtle.dx = position[ 3 ] or 0
    end
end
 
function turtle.save_position()
    settings.set( "position", { { x = turtle.x, y = turtle.y, z = turtle.z }, turtle.dz, turtle.dx } )
    settings.save()
end
 
function turtle.set_position( x, y, z, dir )
    turtle.x = x
    turtle.y = y
    turtle.z = z
 
    if     dir == NORTH then turtle.dz = -1 turtle.dx =  0
    elseif dir == WEST  then turtle.dz =  0 turtle.dx = -1
    elseif dir == EAST  then turtle.dz =  0 turtle.dx =  1
    elseif dir == SOUTH then turtle.dz =  1 turtle.dx =  0
    end
    turtle.save_position()
end
 
 
--- Movement ---
-- Forward --
function turtle.forward()
    turtle.try_refuel()
    if not forward() then return false end
    turtle.x = turtle.x + turtle.dx
    turtle.z = turtle.z + turtle.dz
    turtle.save_position()
    return true
end
 
function turtle.wait_forward() while not turtle.forward() do os.sleep( 0.5 ) end end
function turtle.force_forward( block_to_break ) turtle.force_move( "forward", block_to_break ) end
 
-- Down --
function turtle.down()
    turtle.try_refuel()
    if not down() then return false end
    turtle.y = turtle.y - 1
    turtle.save_position()
    return true
end
 
function turtle.wait_down() while not turtle.down() do os.sleep( 0.5 ) end end
function turtle.force_down( block_to_break ) turtle.force_move( "down", block_to_break ) end
 
-- Back --
function turtle.back()
    turtle.try_refuel()
    if not back() then return false end
    turtle.x = turtle.x - turtle.dx
    turtle.z = turtle.z - turtle.dz
    turtle.save_position()
    return true
end
 
function turtle.wait_back() while not turtle.back() do os.sleep( 0.5 ) end end
function turtle.force_back( block_to_break ) turtle.force_move( "back", block_to_break ) end
 
-- Up --
function turtle.up()
    turtle.try_refuel()
    if not up() then return false end
    turtle.y = turtle.y + 1
    turtle.save_position()
    return true
end
 
function turtle.wait_up() while not turtle.up() do os.sleep( 0.5 ) end end
function turtle.force_up( block_to_break ) turtle.force_move( "up", block_to_break ) end
 
-- Move Direction --
function turtle.moveDir( direction )
    if     direction == "forward" then return turtle.forward()
    elseif direction == "down"    then return turtle.down()
    elseif direction == "back"    then return turtle.back()
    elseif direction == "up"      then return turtle.up()
    end
    error( "turtle.moveDir direction unknown!" )
end
 
-- Reverse --
function turtle.reverse( direction ) return turtle.moveDir( turtle.reverseDir( direction ) ) end
function turtle.force_reverse( direction ) turtle.force_move( turtle.reverseDir( direction ) ) end
 
function turtle.wait_move( direction )
    while not turtle.move( direction ) do
        os.sleep( 1 )
    end
end
 
-- Move --
function turtle.move( direction, block_to_break )
    turtle.try_refuel()
    local moved = turtle.moveDir( direction )
    if not moved and block_to_break and ( turtle.is_block_tag( direction, block_to_break ) or turtle.is_block_name( direction, block_to_break ) ) then
        turtle.digDir( direction )
        return turtle.moveDir( direction )
    end
    return moved
end
 
function turtle.force_move( direction, block_to_break )
    if direction ~= "back" then
        for b = 1, #DO_NOT_MINE do
            if turtle.is_block_name( direction, DO_NOT_MINE[ b ] ) then
                error( "I am scared of this " .. DO_NOT_MINE[ b ] )
            end
        end
    end
 
    while( not turtle.moveDir( direction ) ) do
        local s, d = turtle.inspectDir( direction )
        if s and string.find( d.name, "turtle" ) then
            os.sleep( 0.5 )
        elseif not block_to_break or turtle.is_block_tag( direction, block_to_break ) or turtle.is_block_name( direction, block_to_break ) then
            turtle.digDir( direction )
        end
    end
end
 
--- Turning ---
function turtle.turnRight()
    turnRight()
    local old_dx = turtle.dx
    turtle.dx = -turtle.dz
    turtle.dz = old_dx
    turtle.save_position()
    return true
end
 
function turtle.turnLeft()
    turnLeft()
    local old_dx = turtle.dx
    turtle.dx = turtle.dz
    turtle.dz = -old_dx
    turtle.save_position()
    return true
end
 
function turtle.turn180()
    if math.random ( 2 ) == 1 then
        turtle.turnLeft()
        turtle.turnLeft()
    else
        turtle.turnRight()
        turtle.turnRight()
    end
end
 
function turtle.turnDir( direction )
    if     direction == LEFT  then return turtle.turnLeft()
    elseif direction == RIGHT then return turtle.turnRight()
    end
    error( "turtle.turnDir invalid direction!" )
end
 
function turtle.turn( direction )
    local facing = turtle.facing()
    if facing == direction then
        return
    end
 
    if direction > 3 then
        turtle.turnDir( direction )
    else
        if math.abs( facing - direction ) == 2 then
            turtle.turn180()
        else
            if ( facing - direction ) % 4 == 1 then
                turtle.turnLeft()
            else
                turtle.turnRight()
            end
        end
    end
end
 
--- Dig ---
function turtle.digBack()
    turtle.turn180()
    turtle.dig()
    turtle.turn180()
end
 
function turtle.dig_all( direction ) while turtle.digDir( direction ) do sleep( 0.05 ) end end
 
function turtle.digDir( direction )
    if     direction == "forward"  then return turtle.dig()
    elseif direction == "up"       then return turtle.digUp()
    elseif direction == "down"     then return turtle.digDown()
    elseif direction == "back"     then return turtle.digBack()
    end
    error( "turtle.digDir invalid direction" )
end
 
-- Detect --
function turtle.detectBack()
    turtle.turn180()
    local success = turtle.detect()
    turtle.turn180()
    return success
end
 
function turtle.detectDir( direction )
    if     direction == "forward"  then return turtle.detect()
    elseif direction == "up"       then return turtle.detectUp()
    elseif direction == "down"     then return turtle.detectDown()
    elseif direction == "back"     then return turtle.detectBack()
    end
    error( "turtle.detectDir invalid direction!" )
end
 
-- Inspect --
function turtle.inspectBack()
    turtle.turn180()
    local success, data = turtle.inspect()
    turtle.turn180()
    return success, data
end
 
function turtle.inspectDir( direction )
    if     direction == "up"      then return turtle.inspectUp()
    elseif direction == "down"    then return turtle.inspectDown()
    elseif direction == "forward" then return turtle.inspect()
    elseif direction == "back"    then return turtle.inspectBack()
    end
    error( "inspectDir direction unknown!" )
end
 
-- Place --
function turtle.placeDir( direction )
    if     direction == "forward"  then return turtle.place()
    elseif direction == "up"       then return turtle.placeUp()
    elseif direction == "down"     then return turtle.placeDown()
    end
    error( "turtle.placeDir invalid direction" )
end
 
function turtle.wait_place() while not turtle.place() do os.sleep( 1 ) end end
 
-- Return succes and if false, the name of the block
function turtle.move_inspect( direction )
    if turtle.moveDir( direction ) then
        return true, nil
    end
 
    local s, d = turtle.inspectDir( direction )
    return false, d.name
end
 
function turtle.move_toward( destination )
    local distance = destination - turtle.position()
 
    if distance.x ~= 0 then
        if distance.x > 0 then turtle.turn( EAST ) else turtle.turn( WEST ) end
        return turtle.move_inspect( "forward" )
    end
 
    if distance.z ~= 0 then
        if distance.z > 0 then turtle.turn( SOUTH ) else turtle.turn( NORTH ) end
        return turtle.move_inspect( "forward" )
    end
 
    if distance.y ~= 0 then
        if distance.y > 0 then return turtle.move_inspect( "up" ) else return turtle.move_inspect( "down" ) end
    end
 
    return true
end
 
function turtle.dig_toward( destination )
    local distance = destination - turtle.position()
 
    if distance.x ~= 0 then
        if distance.x > 0 then turtle.turn( EAST ) else turtle.turn( WEST ) end
        return turtle.force_move( "forward" )
    end
 
    if distance.z ~= 0 then
        if distance.z > 0 then turtle.turn( SOUTH ) else turtle.turn( NORTH ) end
        return turtle.force_move( "forward" )
    end
 
    if distance.y ~= 0 then
        if distance.y > 0 then return turtle.force_move( "up" ) else return turtle.force_move( "down" ) end
    end
 
    return true
end
 
-- array of vector
function turtle.follow_path( path, can_dig )
    for i = 1, #path do
        if ( can_dig ) then
            turtle.dig_toward( path[ i ] )
        else
            local s, n = turtle.move_toward( path[ i ] )
 
            if not s then
                map_add( path[ i ], n )
                save_map()
                return false
            end
        end
    end
 
    return true
end
 
function turtle.pathfind_to( destination, can_dig )
    print( "Going to: " .. tostring( destination ) )
    local path = turtle.A_Star( turtle.position(), destination )
    
    while not follow_path( path, can_dig ) do
        print( "recalculating a path.")
        path = turtle.A_Star( turtle.position(), destination )
    end
 
    print( "ARRIVED !")
end
 
-- Inspect --
function turtle.is_block_name( direction, block_name )
    local s, d = turtle.inspectDir( direction )
    return s and d.name == block_name
end
 
function turtle.is_block_tag( direction, tag )
    if direction == "back" then return false end
    if not turtle.detectDir( direction ) then return false end
    local success, data = turtle.inspectDir( direction )
    return success and data.tags[ tag ]
end
 
-- Inventory --
function turtle.getInventory()
    local inv = {}
 
    for i = 1, 16 do
        inv[ i ] = turtle.getItemDetail( i )
    end
 
    return inv
end
 
function turtle.get_item_index( name )
    for i = 1, 16 do
        local item = turtle.getItemDetail( i )
        if item and string.find( item.name, name ) then
            return i
        end
    end
    return -1
end
 
function turtle.has_items()
    for i = 1, 16 do
        if turtle.getItemCount( i ) > 0 then
            return true
        end
    end
    return false
end
 
function turtle.is_inventory_full()
    for i = 1, 16 do
        if turtle.getItemCount( i ) == 0 then
            return false
        end
    end
    return true
end
 
function turtle.drop_in_enderchest( stuff_to_keep )
    local enderchest_index = turtle.get_item_index( "enderstorage:ender_chest" )
 
    if enderchest_index == -1 then return end
 
    local to_keep = {}
    for k, v in pairs( stuff_to_keep ) do
        to_keep[ k ] = v
    end
 
    turtle.dig_all( "up" )
    turtle.select( enderchest_index )
    while not turtle.placeUp() do
        os.sleep( 0.1 )
    end
 
    for i = 1, 16 do
        local item = turtle.getItemDetail( i )
 
        if item then
            print( item.name )
            print( to_keep[ item.name ] )
            if to_keep[ item.name ] and to_keep[ item.name ] > 0 then
                to_keep[ item.name ] = to_keep[ item.name ] - 1
            else
                turtle.select( i )
                turtle.dropUp()
            end
        end
    end
 
    turtle.select( 1 )
    turtle.digUp()
end
 
-- Fuel --
function turtle.get_valid_fuel_index()
    for i = 1, 16 do
        local item = turtle.getItemDetail( i )
 
        for f = 1, #valid_fuel do
            if item and string.find( item.name, valid_fuel[ f ] ) then
                return i
            end
        end
    end
 
    return -1
end
 
function turtle.is_valid_fuel( item_name )
    for f = 1, #valid_fuel do
        if item_name == valid_fuel[ f ] then
            return true
        end
    end
 
    return false
end
 
function turtle.try_refuel()
    if turtle.getFuelLevel() < 100 then
        local fuel_index = turtle.get_valid_fuel_index()
 
        if fuel_index == -1 then
            print( "Give me fuel please!" )
            print( "Valid fluel:" )
 
            for f = 1, #valid_fuel do
                print( valid_fuel[ f ] )
            end
 
            while fuel_index == -1 do
                os.sleep( 1 )
                fuel_index = turtle.get_valid_fuel_index()
            end
        end
 
        print( "Eating Some Fuel." )
        turtle.select( fuel_index )
        turtle.refuel( 2 )
    end
end
 
turtle.load_position()