-- Take from here: https://github.com/LazyVim/LazyVim/discussions/1346
-- Auto change input method between Normal and Insert mode
vim.api.nvim_create_autocmd({ "InsertLeave" }, {
  pattern = "*",
  callback = function()
    -- record the input method in Insert mode
    local f_input = vim.fn.stdpath("state") .. "/last_input.tmp"
    os.execute("im-select > " .. f_input)

    -- switch back to `ABC` input method in Normal mode
    local config = package.config
    if config:sub(1, 1) == "\\" then
      -- windows operation
      print("Windows Operation to change input method")
    elseif config:sub(1, 1) == "/" then
      -- unix / linux / macos operation
      vim.cmd("silent ! im-select com.apple.keylayout.ABC")
    else
      -- other operation
      print("Unrecognized operating system to change input method")
    end
  end,
})

vim.api.nvim_create_autocmd({ "InsertEnter" }, {
  pattern = "*",
  callback = function()
    -- change back to the last input method used in Insert mode if it is recorded
    local f_input = io.open(vim.fn.stdpath("state") .. "/last_input.tmp")
    if f_input then
      local input_method = f_input:read("*a")
      io.close(f_input)
      vim.cmd("silent ! im-select " .. input_method)
    end
  end,
})