#! /usr/bin/env lua
--
-- env_api.lua
-- Copyright (C) 2022 Shewer Lu <shewer@gmail.com>
--
-- Distributed under terms of the MIT license.
--

-- env metatable
local List = require 'tools/list'
local E={}
--
function E:Context()
  return self.engine.context
end
function E:Config()
  return self.engine.schema.config
end
-- 取得 librime 狀態 tab { always=true ....}
-- 須要 新舊版 差異  comp.empty() -->  comp:empty()
function E:get_status()
  local ctx= self.engine.context
  local stat={}
  local comp= ctx.composition
  stat.always=true
  stat.composing= ctx:is_composing()
  stat.empty= not stat.composing
  stat.has_menu= ctx:has_menu()
  -- old version check ( Projection userdata)
  local ok,empty
  if rime_api.Version() < 100 then
    ok,empty = pcall(comp.empty)
    empty=  ok  and empty or comp:empty() --  empty=  ( ok ) ? empty : comp:empty()
  else
    empty = comp:empty()
  end
  stat.paging= not empty and comp:back():has_tag("paging")
  return stat
end

local Config_api =require 'tools/config_api'

-- Config_get_obj(path[,type])  return obj , args: path , type( i
--    type( 1 : ConfigItem 2 : Config of Value or List or Map )
--    type 4 只能單向轉換
--
--  check base_type
--  conver ConfigItem of obj  to list { {path= string, value= string} ...}
local function select_capi(num_type)
  num_type  = type(num_type) == "number" --and num_type or 1
  and num_type >0 and num_type <= 3 and mun_type or 1
  local ar = { Config_api.get_obj, Config_api.get_item, Config_api.get_cdata, }
  return ar[num_type]
end
function E:Config_get(path,_type)
  local item = self.engine.schema.config:get_item(path)
  local conv_func = select_capi(_type)

  return conv_func(item)
end
function E:Config_set(path, obj)
  if obj == nil then return false end
  return self.engine.schema.config:set_item(path,
  Config_api.get_item(obj))
end

--  ex:
--   { 1,{a=2,b=4},2,3,4} , "test" --> { {path= "test/@0" , value = "1" } ,{path="test/@2/a", value="2" ... }
local function to_list_with_path(obj,path,tab,loopchk)
  loopchk = loopchk or {}
  tab = tab or {}
  path  = path or ""
  local tp = type(obj)
  local base_type = tp == "number" or tp == "string" or tp == "boolean"
  if loopchk[obj] or base_type then
    table.insert(tab , {path = path, value=obj})
    return tab
  end
  loopchk[obj] = true
  if type(obj) == "table" then
    local is_list = #obj > 0
    local lpath = #path > 0 and path .. "/" or path
    lpath = is_list and lpath .. "@" or lpath

    for k,v in  (is_list and ipairs or pairs)(obj) do
      to_list_with_path(v, lpath .. k , tab,loopchk)
    end
    return tab
  end
end
function E:Config_get_with_path(path,tpath)
  local  obj=self:Config_get(path)
  tpath= tpath or path
  return to_list_with_path(obj,tpath)
end
local function chk_pdata(path,obj)
  if not obj then return false end
  path:each(function(elm)
    local ok = elm:match("^[%a_]+$") and elm:match("^@%d+$")
    if not ok then return false end
  end)
  return true
end
function E:Config_set_with_path(pdata)
  for i,v in ipairs(pdata) do
    if chk_pdata(v.path,v.obj) then
      self:Config_set(v.path,v.obj)
    else
      Log(WARN,"config set error", v.path,v.obj)
    end
  end
end

function E:config_path_to_str_list(path)
  return List( self:Config_get(path) )
  :map(function(elm) return elm.path .. ": " .. elm.value end)
end
-- Get_tag  args :  ()  , (nil, "translator") ,("date")
function E:Get_tag(def_tag , ns)
  def_tag = def_tag or "" -- default ""
  ns = ns or self.name_space -- default env.name_space
  return self.engine.schema.config:get_string( ns .. "/tag") or def_tag
end
function E:Get_tags(ns)
  ns = ns or self.name_space
  return Set(
    self:Config_get( ns .. "/tags"))
end

function E:append_value_before(path, elm, mvalue)
  local obj = self:Config_get(path)
  if type(obj) ~= "table" or #obj < 1 then return end
  local list = List(self:Config_get(path))
  if list:find( elm) then return end
  local index = list:find(mvalue)
  local dpath = index and path .. "/@before " .. index -1 or path .. "/@next"

  if not self:Config_set(dpath, elm) then
    Log(ERROR, "config set ver error","path", path, "value", elm)
  end
end
-- option function

-- context warp
local C={}
function C.Set_option(self,name)
  self:set_option(name,true)
  return self:get_option(name)
end
function C.Unset_option(self,name)
  self:set_option(name,false)
  return self:get_option(name)
end
function C.Toggle_option(self,name)
  self:set_option(name, not self:get_option(name))
  return self:get_option(name)
end
function E:Set_option(name)
  self.engine.context:set_option(name,true)
  return true
end
function E:Unset_option(name)
  self.engine.context:set_option(name,false)
  return false
end
function E:Toggle_option(name)
  local context= self.engine.context
  context:set_option(name, not context:get_option(name))
  return context:get_option(name)
end
function E:Get_option(name)
  return self.engine.context:get_option(name)
end
-- property function
function E:Get_property(name)
  return self.engine.context:get_property(name)
end
function E:Set_property(name,str)
  self.engine.context:set_property(name,str)
  return str
end

-- processor function  config
function E:get_keybinds(path)
  path = (path or self.name_space) .. "/keybinds"
  local tab = self:Config_get(path)
  tab = type(tab) == "table" and tab or {}
  for key,name in next, tab do
    tab[key] = KeyEvent(name)
  end
  return tab
end
function E:components_str()
  return List("processors","segmentors","translators","filters")
  :map(function(elm) return "engine/" .. elm end)
  :reduce(function(path,list)
    return list + self:Config_get_with_path(path)
  end,List())
  :map(function(elm) return elm.path .. ": " .. elm.value end)
end

function E:print_components(out)
  Log(out,  string.format("----- %s : %s ----", self.engine.schema.schema_id,self.name_space) )
  self:components_str():each(function(elm)
    Log(out,elm)
  end)
end
---  delete
function E:components(path)
  return self:Config_get(path or "engine")
end
E.__index=E


-- wrap env
-- Env(env):get_status()
-- Env(env):config() -- return config with new methods
-- Env(env):context() -- return context with new methods
local function Env(env)
  return setmetatable(env,E)
end

return Env