-------------------------------------------------------------------------------
-- Utilities shared by all modules. Categorize better if > 5 public functions
-------------------------------------------------------------------------------
local Util = {}
-------------------------------------------------------------------------------
-- Internal Functions
-------------------------------------------------------------------------------
local fs = vim.loop

local function create_directory(directory)
  local stat = fs.fs_stat(directory)
  if stat then
    if stat.type == 'directory' then
      return
    else
      error('Expected directory but found file at: ' .. directory)
    end
  else
    local parent = directory:match('(.+)/[^/]*$')
    if parent then
      create_directory(parent)
    end
    local success, error = fs.fs_mkdir(directory, 493)
    if not success then
      error('Could not directory at: ' .. directory .. '. ' .. error)
    end
  end
end
-------------------------------------------------------------------------------
-- Public Interface
-------------------------------------------------------------------------------
-- File Utils

function Util.ensure_directory_exists(path)
  local full_path = vim.fn.expand(path)
  create_directory(path)
end

-- Path Utils

function Util.join(...)
  local separator = '/'
  local paths = {...}
  return table.concat(paths, separator):gsub(separator..'+', separator)
end

function Util.directory_name(file_path)
  local pattern = '(.+)/[^/]+$'
  return file_path:match(pattern)
end

-- Date Utils

function Util.is_valid_date(date_string)
  local pattern = '(%d+)-(%d+)-(%d+)'
  local year, month, day = date_string:match(pattern)
  if year and month and day then
    return true
  end
  return false
end

function Util.is_before_today(date_string)
  local pattern = '(%d+)-(%d+)-(%d+)'
  local year, month, day = date_string:match(pattern)
  if year and month and day then
    local today = os.date('*t')
    local today_date = os.time({year = today.year, month = today.month, day = today.day})
    local date = os.time({year = tonumber(year), month = tonumber(month), day = tonumber(day)})
    return date < today_date
  else
    return false
  end
end

return Util