# Copyright 2021 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

"""Unit tests for dependency_graph.py."""

import pytest

from chromite.lib import dependency_graph
from chromite.lib.parser import package_info


def _build_depgraph():
  """Build a DependencyGraph to test against."""
  sysroot = '/build/target'
  sdk_root = '/'

  virtual = package_info.parse('virtual/target-foo-1.2.3')
  dep = package_info.parse('cat/dep-1.0.0-r1')
  depdep = package_info.parse('cat/depdep-2.0.1-r5')
  bdep = package_info.parse('cat/bdep-3.4')

  virtual_node = dependency_graph.PackageNode(virtual, sysroot,
                                              src_paths=['/virtual/foo'])
  dep_node = dependency_graph.PackageNode(dep, sysroot,
                                          src_paths=['/cat/dep'])
  depdep_node = dependency_graph.PackageNode(depdep, sysroot,
                                             src_paths=['/cat/depdep',
                                                        '/other/depdep'])
  bdep_node = dependency_graph.PackageNode(bdep, sdk_root,
                                           src_paths=['/cat/bdep'])
  depbdep_node = dependency_graph.PackageNode(dep, sdk_root,
                                              src_paths=['/cat/dep'])

  virtual_node.add_dependency(dep_node)
  virtual_node.add_dependency(bdep_node)
  virtual_node.add_dependency(depbdep_node)
  dep_node.add_dependency(depdep_node)
  depbdep_node.add_dependency(depdep_node)

  nodes = (virtual_node, dep_node, depdep_node, bdep_node, depbdep_node)

  return dependency_graph.DependencyGraph(nodes, sysroot, [virtual])


def test_dependency_graph_incorrect_sysroot():
  """Test building a graph with the wrong sysroot fails."""
  pkg = package_info.parse('foo/bar-1.0-r2')
  sdk_root = '/'
  sysroot = '/build/target'
  n1 = dependency_graph.PackageNode(pkg, sdk_root)
  n2 = dependency_graph.PackageNode(pkg, sysroot)

  with pytest.raises(dependency_graph.SysrootValueError):
    dependency_graph.DependencyGraph([n1, n2],
                                     sysroot='/wrong/sysroot',
                                     root_packages=[pkg])


def test_create_invalid_depgraph_too_many_roots():
  """Test building a graph with too many roots fails."""
  pkg = package_info.parse('foo/bar-1.0-r2')
  n1 = dependency_graph.PackageNode(pkg, '/')
  n2 = dependency_graph.PackageNode(pkg, '/build/target')
  n3 = dependency_graph.PackageNode(pkg, '/build/other')

  with pytest.raises(AssertionError):
    dependency_graph.DependencyGraph([n1, n2, n3],
                                     sysroot='/build/target',
                                     root_packages=[pkg])


def test_create_invalid_depgraph_node_conflict():
  """Test building a graph with non-equivalent nodes for one package fails."""
  pkg = package_info.parse('foo/bar-1.0-r2')
  dep = package_info.parse('foo/baz-2.0')
  sysroot = '/build/target'
  pkg_node = dependency_graph.PackageNode(pkg, sysroot)
  pkg_node2 = dependency_graph.PackageNode(pkg, sysroot)
  dep_node = dependency_graph.PackageNode(dep, sysroot)
  pkg_node.add_dependency(dep_node)

  with pytest.raises(dependency_graph.NodeCollisionError):
    dependency_graph.DependencyGraph([pkg_node, dep_node, pkg_node2],
                                     sysroot=sysroot,
                                     root_packages=[pkg])


def test_create_valid_depgraph_duplicate_nodes():
  """Test deduplication of nodes in depgraph creation."""
  pkg = package_info.parse('foo/bar-1.0-r2')
  dep = package_info.parse('foo/baz-2.0')
  sysroot = '/build/target'

  pkg_node = dependency_graph.PackageNode(pkg, sysroot)
  pkg_node2 = dependency_graph.PackageNode(pkg, sysroot)
  pkg_node3 = dependency_graph.PackageNode(pkg, sysroot)
  dep_node = dependency_graph.PackageNode(dep, sysroot)

  pkg_node.add_dependency(dep_node)
  pkg_node2.add_dependency(dep_node)
  pkg_node3.add_dependency(dep_node)

  assert pkg_node == pkg_node2 == pkg_node3
  assert len(list(dep_node.reverse_dependencies)) == 1

  # Add multiple instances of the same node instance, plus multiple equal nodes.
  packages = (pkg_node, pkg_node, pkg_node2, pkg_node3, dep_node)
  graph = dependency_graph.DependencyGraph(
      packages, sysroot=sysroot, root_packages=[pkg])
  # Should only have the nodes for the two packages at the end.
  assert len(graph) == 2


def test_dependency_graph_roots():
  """Test the roots get parsed correctly."""
  graph = _build_depgraph()

  assert graph.sdk_root == '/'
  assert graph.sysroot_path == '/build/target'


def test_dependency_graph_len():
  """Test the graph size."""
  graph = _build_depgraph()
  assert len(graph) == 5


def test_dependency_graph_in():
  """Test __contains__."""
  graph = _build_depgraph()

  virtual = package_info.parse('virtual/target-foo-1.2.3')

  # Full package info instance should be found (via cpvr).
  assert virtual in graph
  # CPVR string should be found.
  assert virtual.cpvr in graph
  # Atom string should be found.
  assert virtual.atom in graph
  # Package not in graph should not be found.
  assert 'not/in-1.0' not in graph


def test_dependency_graph_iter():
  """Test __iter__ BFS traversal."""
  graph = _build_depgraph()

  virtual = package_info.parse('virtual/target-foo-1.2.3')
  dep = package_info.parse('cat/dep-1.0.0-r1')
  depdep = package_info.parse('cat/depdep-2.0.1-r5')
  bdep = package_info.parse('cat/bdep-3.4')

  # Expected Order:
  # 1. the root package (virtual/target-foo).
  # 2-4. cat/dep (sysroot), cat/dep (sdk), cat/bdep in any order.
  # 5. depdep.
  expected_order = [[virtual], [dep, bdep], [dep, bdep], [dep, bdep], [depdep]]
  for i, node in enumerate(graph):
    assert node.pkg_info in expected_order[i]


def test_dependency_graph_get_nodes():
  """Test get_nodes retrieves the expected results."""
  graph = _build_depgraph()

  virtual = package_info.parse('virtual/target-foo-1.2.3')
  virtual_atom = package_info.parse('virtual/target-foo')

  # Test fetching by different values.
  pi_nodes = graph.get_nodes(virtual)
  cpvr_nodes = graph.get_nodes(virtual.cpvr)
  atom_nodes = graph.get_nodes(virtual.atom)
  pi_atom_nodes = graph.get_nodes(virtual_atom)
  assert pi_nodes == cpvr_nodes == atom_nodes == pi_atom_nodes


def test_dependency_graph_get_nodes_by_roots():
  """Test get_nodes correctly filters by the root types."""
  graph = _build_depgraph()

  dep = package_info.parse('cat/dep-1.0.0-r1')

  # Verify the correct counts.
  dep_all = graph.get_nodes(dep)
  dep_sysroot = graph.get_nodes(dep, dependency_graph.RootType.SYSROOT)
  dep_sdk = graph.get_nodes(dep, dependency_graph.RootType.SDK)
  assert len(dep_all) == 2
  assert len(dep_sysroot) == 1
  assert len(dep_sdk) == 1

  # Verify we got the correct nodes.
  dep_sysroot_node = dep_sysroot.pop()
  dep_sdk_node = dep_sdk.pop()
  assert dep_sysroot_node in dep_all
  assert dep_sdk_node in dep_all
  assert dep_sysroot_node.root == '/build/target'
  assert dep_sdk_node.root == '/'


def test_dependency_graph_get_nodes_multi_version_package():
  """Test handling of multiple packages with different versions."""
  virtual = package_info.parse('virtual/foo-1.0')
  pkg1 = package_info.parse('cat/pkg-1.0')
  pkg2 = package_info.parse('cat/pkg-2.0')

  sysroot = '/build/target'
  sdk = '/'

  virtual_pn = dependency_graph.PackageNode(virtual, sysroot)
  pkg1_pn = dependency_graph.PackageNode(pkg1, sysroot)
  pkg1_pn_sdk = dependency_graph.PackageNode(pkg1, sdk)
  pkg2_pn = dependency_graph.PackageNode(pkg2, sysroot)
  pkg2_pn_sdk = dependency_graph.PackageNode(pkg2, sdk)

  virtual_pn.add_dependency(pkg1_pn)
  virtual_pn.add_dependency(pkg1_pn_sdk)
  virtual_pn.add_dependency(pkg2_pn)
  virtual_pn.add_dependency(pkg2_pn_sdk)

  graph = dependency_graph.DependencyGraph((virtual_pn,),
                                           sysroot, root_packages=[virtual])

  # Should get both instances of cat/pkg-1.0.
  assert len(graph.get_nodes(pkg1)) == 2
  assert len(graph.get_nodes(pkg1.cpvr)) == 2
  assert all(p.pkg_info.cpvr == pkg1.cpvr for p in graph.get_nodes(pkg1))

  # Should get both instances of cat/pkg-2.0.
  assert len(graph.get_nodes(pkg2)) == 2
  assert len(graph.get_nodes(pkg2.cpvr)) == 2
  assert all(p.pkg_info.cpvr == pkg2.cpvr for p in graph.get_nodes(pkg2))

  atom = package_info.parse(pkg1.atom)
  # Should get both instances of cat/pkg-1.0 and both instances of cat/pkg-2.0.
  assert len(graph.get_nodes(atom)) == 4
  assert len(graph.get_nodes(atom.atom)) == 4
  assert all(p.pkg_info.atom == atom.atom for p in graph.get_nodes(atom))


def test_dependency_graph_dependencies():
  """Tests for get_dependencies and get_reverse_dependencies."""
  graph = _build_depgraph()

  virtual = package_info.parse('virtual/target-foo-1.2.3')
  dep = package_info.parse('cat/dep-1.0.0-r1')
  depdep = package_info.parse('cat/depdep-2.0.1-r5')
  bdep = package_info.parse('cat/bdep-3.4')

  dep_nodes = graph.get_nodes(dep)
  bdep_node = graph.get_nodes(
      bdep, root_type=dependency_graph.RootType.SDK).pop()
  # The virtual has three dependencies; dep x2(sdk + sysroot), and bdep.
  assert set(graph.get_dependencies(virtual)) == {*dep_nodes, bdep_node}
  # Virtual has no revdeps.
  assert not list(graph.get_reverse_dependencies(virtual))

  # Leaf node has no dependencies.
  assert not list(graph.get_dependencies(depdep))
  # Leaf node has two revdeps.
  assert set(graph.get_reverse_dependencies(depdep)) == set(dep_nodes)


def test_dependency_graph_is_dependency():
  """Test is_dependency method."""
  graph = _build_depgraph()

  virtual = package_info.parse('virtual/target-foo-1.2.3')
  dep = package_info.parse('cat/dep-1.0.0-r1')
  depdep = package_info.parse('cat/depdep-2.0.1-r5')
  bdep = package_info.parse('cat/bdep-3.4')

  # Direct dependency.
  assert graph.is_dependency(dep, virtual)
  # Specifying direct=True should make no difference.
  assert graph.is_dependency(dep, virtual, direct=True)
  # Indirect dependency.
  assert graph.is_dependency(depdep, virtual)
  # Indirect dependency checking direct only.
  assert not graph.is_dependency(depdep, virtual, direct=True)
  # Not a dependency.
  assert not graph.is_dependency(depdep, bdep)


def test_dependency_graph_is_dependency_root_types():
  """Test is_dependency method when using the root type filters."""
  graph = _build_depgraph()

  virtual = package_info.parse('virtual/target-foo-1.2.3')
  bdep = package_info.parse('cat/bdep-3.4')

  # Valid dependency when filtering roots.
  # bdep is in the SDK.
  assert graph.is_dependency(
      bdep, virtual, dep_root_type=dependency_graph.RootType.SDK)
  # bdep is also direct dependency.
  assert graph.is_dependency(
      bdep, virtual, dep_root_type=dependency_graph.RootType.SDK, direct=True)
  # virtual is in the sysroot.
  assert graph.is_dependency(
      bdep,
      virtual,
      dep_root_type=dependency_graph.RootType.SDK,
      src_root_type=dependency_graph.RootType.SYSROOT)

  # Invalid dependency when filtering roots.
  # bdep is not in the sysroot.
  assert not graph.is_dependency(
      bdep, virtual, dep_root_type=dependency_graph.RootType.SYSROOT)
  # virtual is not in the SDK.
  assert not graph.is_dependency(
      bdep, virtual, src_root_type=dependency_graph.RootType.SDK)


def test_depedency_graph_is_relevant():
  """Test the is_relevant method."""
  graph = _build_depgraph()
  # Dependency.
  # Fetch node and call directly.
  assert graph.get_nodes('cat/depdep')[0].is_relevant('/cat/depdep')
  # Search the depgraph.
  assert graph.is_relevant('/cat/depdep')

  # Reverse dependency.
  assert graph.is_relevant('/cat/bdep')

  # Irrelevant path.
  assert not graph.is_relevant('/not/relevant')


def test_dependency_graph_any_relevant():
  """Test the any_relevant method."""
  graph = _build_depgraph()
  # Both relevant.
  assert graph.any_relevant(['/cat/dep', '/cat/bdep'])
  # One relevant.
  assert graph.any_relevant(['/not/relevant', '/cat/bdep'])
  # Neither relevant.
  assert not graph.any_relevant(['/not/relevant', '/also/not/relevant'])