local oil = require("oil")
local test_util = require("tests.test_util")
local fs = require("oil.fs")

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

  it("sets previous buffer as alternate", function()
    vim.cmd.edit({ args = { "foo" } })
    oil.open()
    vim.cmd.edit({ args = { "bar" } })
    assert.equals("foo", vim.fn.expand("#"))
  end)

  it("sets previous buffer as alternate when editing oil://", function()
    vim.cmd.edit({ args = { "foo" } })
    vim.cmd.edit({ args = { "oil://" .. fs.os_to_posix_path(vim.fn.getcwd()) } })
    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" } })
    oil.open()
    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" } })
    oil.open()
    oil.close()
    assert.equals("foo", vim.fn.expand("#"))
  end)

  it("sets previous buffer as alternate after multi-dir hops", function()
    vim.cmd.edit({ args = { "foo" } })
    oil.open()
    oil.open()
    oil.open()
    oil.open()
    vim.cmd.edit({ args = { "bar" } })
    assert.equals("foo", vim.fn.expand("#"))
  end)
end)