local M = {}

M.defaults = {
  width  = 0.9,
  height = 0.9,
  border = "rounded",
}

M.config = vim.deepcopy(M.defaults)

local function get_visual_selection()
  local s = vim.fn.getpos("'<")
  local e = vim.fn.getpos("'>")
  local lines = vim.fn.getregion(s, e, { type = vim.fn.visualmode() })
  return vim.trim(table.concat(lines, "\n"))
end

function M.open(opts)
  if vim.fn.executable("jwt-tui") == 0 then
    vim.notify("[jwt-tui] jwt-tui not found in PATH", vim.log.levels.ERROR)
    return
  end

  local args = { "jwt-tui" }
  if opts.token and opts.token ~= "" then
    vim.list_extend(args, { "-t", opts.token })
  end
  if opts.secret and opts.secret ~= "" then
    vim.list_extend(args, { "-s", opts.secret })
  end

  local cfg = M.config
  local width  = math.floor(vim.o.columns * cfg.width)
  local height = math.floor(vim.o.lines   * cfg.height)

  local buf = vim.api.nvim_create_buf(false, true)
  vim.api.nvim_open_win(buf, true, {
    relative = "editor",
    width    = width,
    height   = height,
    col      = math.floor((vim.o.columns - width)  / 2),
    row      = math.floor((vim.o.lines   - height) / 2),
    style    = "minimal",
    border   = cfg.border,
  })

  vim.fn.termopen(args, {
    on_exit = function()
      if vim.api.nvim_buf_is_valid(buf) then
        vim.api.nvim_buf_delete(buf, { force = true })
      end
    end,
  })
  vim.cmd("startinsert")
end

function M.open_selection()
  M.open({ token = get_visual_selection() })
end

return M