local TmpDir = require('spec.tmpdir')
local oil = require('oil')
local test_util = require('spec.test_util')
local util = require('oil.util')

describe('oil preview', function()
  local tmpdir
  before_each(function()
    tmpdir = TmpDir.new()
  end)
  after_each(function()
    if tmpdir then
      tmpdir:dispose()
    end
    test_util.reset_editor()
  end)

  it('opens preview window', function()
    tmpdir:create({ 'a.txt' })
    test_util.oil_open(tmpdir.path)
    test_util.await(oil.open_preview, 2)
    local preview_win = util.get_preview_win()
    assert.not_nil(preview_win)
    assert(preview_win)
    local bufnr = vim.api.nvim_win_get_buf(preview_win)
    local preview_lines = vim.api.nvim_buf_get_lines(bufnr, 0, -1, false)
    assert.are.same({ 'a.txt' }, preview_lines)
  end)

  it('opens preview window when open(preview={})', function()
    tmpdir:create({ 'a.txt' })
    test_util.oil_open(tmpdir.path, { preview = {} })
    local preview_win = util.get_preview_win()
    assert.not_nil(preview_win)
    assert(preview_win)
    local bufnr = vim.api.nvim_win_get_buf(preview_win)
    local preview_lines = vim.api.nvim_buf_get_lines(bufnr, 0, -1, false)
    assert.are.same({ 'a.txt' }, preview_lines)
  end)
end)