--- loveutils.datas : simple functions for data manipulation.

--[[
  Copyright © 2021 Kazhnuz

  Permission is hereby granted, free of charge, to any person obtaining a copy of
  this software and associated documentation files (the "Software"), to deal in
  the Software without restriction, including without limitation the rights to
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  COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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]]

local DataUtils = {}

local DATADIR = "datas"
local GAMEDATADIR = "gamedata"

--- Verify if a name correspond to a lua file
---@param name string the filename you want to test
---@return boolean isLua if the filename finish by .lua
function DataUtils.isLuaFile(name)
  local extension = name:sub(#name - 3, #name)
  return (extension == ".lua")
end

--- Transform a lua filename to a module name
---@param luaFile string the filename you want to transform
---@return boolean moduleName the module name
function DataUtils.luaFileToModule(luaFile)
  if (DataUtils.isLuaFile(luaFile)) then
    return luaFile:sub(1, #luaFile - 4)
  else
    return luaFile
  end
end

--- Transform a list of lua filename to a list of module name
---@param luaFileList table the filename list you want to transform
---@return table moduleList the module name list
function DataUtils.luaFileListToModuleList(luaFileList)
  local moduleList = {}
  for i,luaFile in ipairs(luaFileList) do
    table.insert(moduleList, DataUtils.luaFileToModule(luaFile))
  end
  return moduleList
end

--- Use "require" on a a composited filename
---@param parent string the parent filename
---@param filename string the filename of the file
---@return any data the content of the lua file
function DataUtils.require(parent, filename)
  return require(DataUtils.concatFolder(parent, filename, true))
end

--- Require and copy the content of a lua file 
--- It's mostly used for lua file containing data, for not having to copy their data
---@param filepath string the filepath of the file
---@return table data the copied content of the lua file
function DataUtils.copy(filepath)
  local orig = require(filepath)
  local orig_type = type(orig)
  local copy
  if orig_type == 'table' then
      copy = {}
      for orig_key, orig_value in pairs(orig) do
          copy[orig_key] = orig_value
      end
  else -- number, string, boolean, etc
      copy = orig
  end
  return copy
end


--- Require and copy the content of a lua file from it's parent folder
--- It's mostly used for lua file containing data, for not having to copy their data
---@param parent string the path of the parent
---@param filename string the filename of the file
---@return table data the copied content of the lua file
function DataUtils.copyDataset(parent, filename)
  local orig = DataUtils.require(parent, filename)
  local orig_type = type(orig)
  local copy
  if orig_type == 'table' then
      copy = {}
      for orig_key, orig_value in pairs(orig) do
          copy[orig_key] = orig_value
      end
  else -- number, string, boolean, etc
      copy = orig
  end
  return copy
end

--- Get a data directory path from the gamedata dir
---@param folder string the folder name
---@param lua boolean if we are dealing with lua modules
---@return string path the data directory path
function DataUtils.concatDataFolder(folder, lua)
  return DataUtils.concatFolder(DataUtils.getGameDataDir(lua), folder, lua)
end

--- Get the game data directory
---@param lua boolean if we are dealing with lua modules
---@return string path the gamedirectory path
function DataUtils.getGameDataDir(lua)
  return DataUtils.concatFolder(DATADIR, GAMEDATADIR, lua)
end

--- Concat a folder path
---@param parent string the path of the parent folder
---@param filename string the name of the element you want to concat to the path
---@param lua boolean if we are dealing with lua modules
---@return string path the path
function DataUtils.concatFolder(parent, filename, lua)
  return parent .. DataUtils.sep(lua) .. filename
end

--- Return the separater character for lua modules or filesystem pathname
---@param lua boolean if we are dealing with lua modules
---@return string sep the separator
function DataUtils.sep(lua)
  if (lua) then
    return "."
  else
    return "/"
  end
end

return DataUtils