local REALM_START = 5000
local REALM_END = 5500

rgt_realms.register_realm {
    name = "outback",
    label = "Outback",
    min = vector.new(-100, REALM_START, -100),
    max = vector.new(100, REALM_END, 100),
    sky = {
        type = "regular",
        sky_color = {
            day_sky = "#746ec9",
            day_horizon = "#94a3ce"
        },
--        fog = {
--            fog_distance = 20,
--            fog_start = 0.3,
--            fog_color = "#aab"
--        }
    }
}

local vm_data = {}
function rgt.add_tree(pos)
    local vm = minetest.get_voxel_manip(pos:offset(-50, -50, -50), pos:offset(50, 50, 50))
    local area = VoxelArea(vm:get_emerged_area())
    vm:get_data(vm_data)
    local c_air = minetest.get_content_id("air")
    local c_grass = minetest.get_content_id("dirt_grass")
    local c_wood = minetest.get_content_id("spruce_planks")
    local c_root = minetest.get_content_id("path_grass")
    local up = vector.new(0,1,0)
    
    
    local tree_radius = math.random(2, 4)
    local canopy_height = math.random(15, 25)
    local offset = vector.zero()
    
--    local trunk_height = math.random(8, 15)  -- Random height for variety
--    local initial_radius = math.random(2, 4) * 0.5  -- Start wider (0.5 for smoother scaling)
--    local sway_strength = 0.3  -- Max sway offset per height unit
--    
--    local trunk_path = {}
--    local current_pos = vector.new(pos.x, pos.y, pos.z)
--    local target_pos = vector.new(
--        pos.x + (math.random() - 0.5) * 4,  -- Slight random lean
--        pos.y + trunk_height,
--        pos.z + (math.random() - 0.5) * 4
--    )
--    for h = 0, trunk_height, 0.5 do  -- Finer steps for smoothness
--        local t = h / trunk_height
--        local noise_x = (math.random() - 0.5) * sway_strength * 2  -- Perlin-like noise
--        local noise_z = (math.random() - 0.5) * sway_strength * 2
--        local path_pos = current_pos + (target_pos - current_pos):normalize() * 0.5  -- Step along axis
--        path_pos.x = path_pos.x + noise_x
--        path_pos.z = path_pos.z + noise_z
--        table.insert(trunk_path, {pos = path_pos, radius = initial_radius * math.sqrt(1 - t)})  -- Exponential taper
--    end
--
--    -- Place trunk nodes along path (interpolate between path points for density)
--    for i = 1, #trunk_path - 1 do
--        local seg_start = trunk_path[i]
--        local seg_end = trunk_path[i+1]
--        local seg_len = vector.distance(seg_start.pos, seg_end.pos)
--        for step = 0, seg_len, 1 do  -- Place at integer positions
--            local interp_t = step / seg_len
--            local trunk_node = {
--                pos = seg_start.pos + (seg_end.pos - seg_start.pos) * interp_t,
--                radius = seg_start.radius + (seg_end.radius - seg_start.radius) * interp_t
--            }
--            local node_x, node_y, node_z = math.round(trunk_node.pos.x), math.round(trunk_node.pos.y), math.round(trunk_node.pos.z)
--            local r = math.floor(trunk_node.radius + 0.5)  -- Round for voxel placement
--            for dx = -r, r do
--                for dz = -r, r do
--                    local dist = vector.distance(vector.new(dx, 0, dz), vector.zero())
--                    if dist <= r then
--                        local idx = area:index(node_x + dx, node_y, node_z + dz)
--                        if vm_data[idx] == c_air then  -- Only overwrite air
--                            vm_data[idx] = c_wood
--                        end
--                    end
--                end
--            end
--        end
--    end
    
    -- Generate the trunk.
    local r = tree_radius
    local p = pos
    for y = 0, canopy_height do
        for x = -r, r do
            for z = -r, r do
                if vector.distance(vector.new(x, 0, z), vector.zero()) <= r then
                    vm_data[area:index(math.round(p.x +x), math.round(p.y), math.round(p.z +z))] = c_wood
                end
            end
        end
        p = p:offset(0,1,0) --+vector.rotate_around_axis(vector.new(0,0,0.2), up, math.pi *2 *(math.random() -0.5))
    end
    
    --Generate roots.
    local num_roots = math.random(3, 6) +math.floor(math.abs(tree_radius -3) ^2)
    for i = 1, num_roots do
        local dir = vector.rotate_around_axis(vector.new(0,0,1), up, math.pi *2 /num_roots *i)
        local length = math.random() *6 +3
        p = pos +(dir *math.floor(tree_radius +1))
        while length > 0 do
            local pr = p:round()
            -- Check up to 3 nodes down for grass.
            for j = 1, 3 do
                if vm_data[area:index(pr.x, pr.y, pr.z)] ~= c_air then break end
                p.y = p.y -1
                pr.y = pr.y -1
            end
            -- End the root if it would be too vertical.
            if vm_data[area:index(pr.x, pr.y, pr.z)] == c_air then break end
            vm_data[area:index(pr.x, pr.y, pr.z)] = c_root
            length = length -1
            -- Randomly nudge the root direction.
--            dir = dir:rotate_around_axis(up, math.random() *1.5 -0.5)
            p = p +dir:rotate_around_axis(up, math.random() *1.5 -0.5)
        end
    end
    
    vm:set_data(vm_data)
    vm:write_to_map()
end

rgt.register_node("outback_planks", {
    tiles = {"rgt_outback_planks.png"},
    groups = {hand_breakable = 3}
})


rgt.register_node("dirt_stony", {
    tiles = {"rgt_dirt_stony.png", "rgt_dirt.png"},
    groups = {hand_breakable = 3}
})

rgt.register_node("cobble_mossy", {
    tiles = {"rgt_cobble_mossy.png"},
    groups = {hand_breakable = 3}
})

minetest.register_mapgen_script(minetest.get_modpath(minetest.get_current_modname()).."/mapgen.lua")