-- This file takes care of the cave shapes.

noordstar_caves.registered_shapes = {}

-- Clean the input and return a valid shape def
-- If the input is invalid, return nil
local function clean_def(def)
    if type(def.name) ~= "string" then
        return nil
    end
    if type(def.connectivity_point) ~= "number" then
        return nil
    end
    if type(def.verticality_point) ~= "number" then
        return nil
    end

    local d = {
        name = def.name,
        connectivity_point = def.connectivity_point,
        verticality_point = def.verticality_point
    }

    if type(def.noise_params) == "table" then
        d.noise_params = def.noise_params
    end

    if type(def.func) == "function" then
        d.func = def.func
    else
        d.func = function(pos, v) return v end
    end

    if type(def.y_min) == "number" and type(def.y_max) == "number" then
        d.y_min = def.y_min
        d.y_max = def.y_max
    end

    return d
end

function noordstar_caves.register_shape(def)
    local d = clean_def(def)

    if d ~= nil then
        noordstar_caves.registered_shapes[d.name] = d
    end
end