--- Helper module for managing the config in the application.
-- @module lqc.config
-- @alias config
local config = {}

--- Helper function for getting the default random seed.
--
-- @return default seed used by the application (the current timestamp).
function config.default_seed()
    return os.time()
end

local default_config = {
    files_or_dirs = {'.'},
    seed = config.default_seed(),
    numtests = 100,
    numshrinks = 100,
    colors = false,
    threads = 1,
    check = false,
}

--- Checks if the argument is empty (nil or {}).
--
-- @param x Argument to check
-- @return true if arg is empty; otherwise false.
local function is_empty_arg(x)
    return x == nil or (type(x) == 'table' and #x == 0)
end

--- Determines the config to use based on the table of supplied values.
-- If no value is supplied for a specific setting, a default value is used
-- (see top of file).
--
-- @return the updated config
function config.resolve(values)
    for _, arg_name in ipairs {'files_or_dirs', 'seed', 'numtests', 'numshrinks', 'colors', 'threads', 'check'} do
        if is_empty_arg(values[arg_name]) then
            values[arg_name] = default_config[arg_name]
        end
    end
    return values
end

return config