local canola = require('canola')
local fs = require('canola.fs')
local test_util = require('spec.test_util')

describe('Alternate buffer', function()
  after_each(function()
    test_util.reset_editor()
  end)

  it('sets previous buffer as alternate', function()
    vim.cmd.edit({ args = { 'foo' } })
    canola.open()
    test_util.wait_for_autocmd({ 'User', pattern = 'CanolaEnter' })
    vim.cmd.edit({ args = { 'bar' } })
    assert.equals('foo', vim.fn.expand('#'))
  end)

  it('sets previous buffer as alternate when editing url file', function()
    vim.cmd.edit({ args = { 'foo' } })
    canola.open()
    test_util.wait_for_autocmd({ 'User', pattern = 'CanolaEnter' })
    local readme = fs.join(vim.fn.getcwd(), 'README.md')
    vim.cmd.edit({ args = { 'canola://' .. fs.os_to_posix_path(readme) } })
    test_util.wait_for_autocmd('BufEnter')
    assert.equals(readme, vim.api.nvim_buf_get_name(0))
    assert.equals('foo', vim.fn.expand('#'))
  end)

  it('sets previous buffer as alternate when editing canola://', function()
    vim.cmd.edit({ args = { 'foo' } })
    vim.cmd.edit({ args = { 'canola://' .. fs.os_to_posix_path(vim.fn.getcwd()) } })
    test_util.wait_for_autocmd({ 'User', pattern = 'CanolaEnter' })
    vim.cmd.edit({ args = { 'bar' } })
    assert.equals('foo', vim.fn.expand('#'))
  end)

  it('preserves alternate buffer if editing the same file', function()
    vim.cmd.edit({ args = { 'foo' } })
    vim.cmd.edit({ args = { 'bar' } })
    canola.open()
    test_util.wait_for_autocmd({ 'User', pattern = 'CanolaEnter' })
    vim.cmd.edit({ args = { 'bar' } })
    assert.equals('foo', vim.fn.expand('#'))
  end)

  it('preserves alternate buffer if discarding changes', function()
    vim.cmd.edit({ args = { 'foo' } })
    vim.cmd.edit({ args = { 'bar' } })
    canola.open()
    test_util.wait_for_autocmd({ 'User', pattern = 'CanolaEnter' })
    canola.close()
    assert.equals('bar', vim.fn.expand('%'))
    assert.equals('foo', vim.fn.expand('#'))
  end)

  it('sets previous buffer as alternate after multi-dir hops', function()
    vim.cmd.edit({ args = { 'foo' } })
    canola.open()
    test_util.wait_for_autocmd({ 'User', pattern = 'CanolaEnter' })
    canola.open()
    test_util.wait_for_autocmd({ 'User', pattern = 'CanolaEnter' })
    canola.open()
    test_util.wait_for_autocmd({ 'User', pattern = 'CanolaEnter' })
    canola.open()
    test_util.wait_for_autocmd({ 'User', pattern = 'CanolaEnter' })
    vim.cmd.edit({ args = { 'bar' } })
    assert.equals('foo', vim.fn.expand('#'))
  end)

  it('sets previous buffer as alternate when inside canola buffer', function()
    vim.cmd.edit({ args = { 'foo' } })
    canola.open()
    test_util.wait_for_autocmd({ 'User', pattern = 'CanolaEnter' })
    assert.equals('foo', vim.fn.expand('#'))
    vim.cmd.edit({ args = { 'bar' } })
    assert.equals('foo', vim.fn.expand('#'))
    canola.open()
    assert.equals('bar', vim.fn.expand('#'))
  end)

  it('preserves alternate when traversing canola dirs', function()
    vim.cmd.edit({ args = { 'foo' } })
    canola.open()
    test_util.wait_for_autocmd({ 'User', pattern = 'CanolaEnter' })
    assert.equals('foo', vim.fn.expand('#'))
    vim.wait(1000, function()
      return canola.get_cursor_entry()
    end, 10)
    vim.api.nvim_win_set_cursor(0, { 1, 1 })
    canola.select()
    test_util.wait_for_autocmd({ 'User', pattern = 'CanolaEnter' })
    assert.equals('foo', vim.fn.expand('#'))
  end)

  it('preserves alternate when opening preview', function()
    vim.cmd.edit({ args = { 'foo' } })
    canola.open()
    test_util.wait_for_autocmd({ 'User', pattern = 'CanolaEnter' })
    assert.equals('foo', vim.fn.expand('#'))
    vim.wait(1000, function()
      return canola.get_cursor_entry()
    end, 10)
    vim.api.nvim_win_set_cursor(0, { 1, 1 })
    canola.open_preview()
    test_util.wait_for_autocmd({ 'User', pattern = 'CanolaEnter' })
    assert.equals('foo', vim.fn.expand('#'))
  end)

  describe('floating window', function()
    it('sets previous buffer as alternate', function()
      vim.cmd.edit({ args = { 'foo' } })
      canola.open_float()
      test_util.wait_for_autocmd({ 'User', pattern = 'CanolaEnter' })
      vim.api.nvim_win_close(0, true)
      vim.cmd.edit({ args = { 'bar' } })
      assert.equals('foo', vim.fn.expand('#'))
    end)

    it('preserves alternate buffer if editing the same file', function()
      vim.cmd.edit({ args = { 'foo' } })
      vim.cmd.edit({ args = { 'bar' } })
      canola.open_float()
      test_util.wait_for_autocmd({ 'User', pattern = 'CanolaEnter' })
      vim.api.nvim_win_close(0, true)
      vim.cmd.edit({ args = { 'bar' } })
      assert.equals('foo', vim.fn.expand('#'))
    end)

    it('preserves alternate buffer if discarding changes', function()
      vim.cmd.edit({ args = { 'foo' } })
      vim.cmd.edit({ args = { 'bar' } })
      canola.open_float()
      test_util.wait_for_autocmd({ 'User', pattern = 'CanolaEnter' })
      canola.close()
      assert.equals('foo', vim.fn.expand('#'))
    end)

    it('preserves alternate when traversing to a new file', function()
      vim.cmd.edit({ args = { 'foo' } })
      canola.open_float()
      test_util.wait_for_autocmd({ 'User', pattern = 'CanolaEnter' })
      assert.equals('foo', vim.fn.expand('#'))
      test_util.feedkeys({ '/LICENSE<CR>' }, 10)
      canola.select()
      test_util.wait_for_autocmd('BufEnter')
      assert.equals('LICENSE', vim.fn.expand('%:.'))
      assert.equals('foo', vim.fn.expand('#'))
    end)
  end)
end)