local t = require('test.testutil')
local n = require('test.functional.testnvim')()
local Screen = require('test.functional.ui.screen')

local eq = t.eq
local dedent = t.dedent
local exec = n.exec
local feed = n.feed
local clear = n.clear
local fn = n.fn
local command = n.command
local api = n.api

local cmdtest = function(cmd, prep, ret1)
  describe(':' .. cmd, function()
    before_each(function()
      clear()
      api.nvim_buf_set_lines(0, 0, 1, true, { 'foo', 'bar', 'baz' })
    end)

    local buffer_contents = function()
      return api.nvim_buf_get_lines(0, 0, -1, false)
    end

    it(cmd .. 's' .. prep .. ' the current line by default', function()
      command(cmd .. '\nabc\ndef')
      eq(ret1, buffer_contents())
    end)
    -- Used to crash because this invokes history processing which uses
    -- hist_char2type which after fdb68e35e4c729c7ed097d8ade1da29e5b3f4b31
    -- crashed.
    it(cmd .. 's' .. prep .. ' the current line by default when feeding', function()
      feed(':' .. cmd .. '\nabc\ndef\n.\n')
      eq(ret1, buffer_contents())
    end)
    -- This used to crash since that commit as well.
    it('opens empty cmdline window', function()
      local hisline = '" Some comment to be stored in history'
      feed(':' .. hisline .. '<CR>')
      feed(':' .. cmd .. '<CR>abc<CR>def<C-f>')
      eq({ 'def' }, buffer_contents())
      eq(hisline, fn.histget(':', -2))
      eq(cmd, fn.histget(':'))
      -- Test that command-line window was launched
      eq('nofile', api.nvim_get_option_value('buftype', {}))
      eq('n', fn.mode(1))
      feed('<CR>')
      eq('c', fn.mode(1))
      feed('.<CR>')
      eq('n', fn.mode(1))
      eq(ret1, buffer_contents())
    end)
  end)
end
cmdtest('insert', ' before', { 'abc', 'def', 'foo', 'bar', 'baz' })
cmdtest('append', ' after', { 'foo', 'abc', 'def', 'bar', 'baz' })
cmdtest('change', '', { 'abc', 'def', 'bar', 'baz' })

describe('the first line is redrawn correctly after inserting text in an empty buffer', function()
  local screen
  before_each(function()
    clear()
    screen = Screen.new(20, 8)
    screen:set_default_attr_ids({
      [1] = { bold = true, foreground = Screen.colors.Blue },
      [2] = { bold = true, reverse = true },
    })
    screen:attach()
  end)

  it('using :append', function()
    exec(dedent([[
      append
      aaaaa
      bbbbb
      .]]))
    screen:expect([[
      aaaaa               |
      ^bbbbb               |
      {1:~                   }|*5
                          |
    ]])
  end)

  it('using :insert', function()
    exec(dedent([[
      insert
      aaaaa
      bbbbb
      .]]))
    screen:expect([[
      aaaaa               |
      ^bbbbb               |
      {1:~                   }|*5
                          |
    ]])
  end)
end)