from ford.fortran_project import Project
from ford import ProjectSettings
from ford.graphs import graphviz_installed, GraphManager
import ford.sourceform
from ford._markdown import MetaMarkdown
from ford.settings import INTRINSIC_MODS

from textwrap import dedent
from typing import Dict


import pytest
from bs4 import BeautifulSoup


def create_project(settings: ProjectSettings):
    project = Project(settings)
    md = MetaMarkdown(project=project)
    project.markdown(md)
    project.correlate()
    return project


project_graphs: Dict[str, GraphManager] = {}


@pytest.fixture(scope="module")
def make_project_graphs(tmp_path_factory, request):
    data = """\
    module a
    end module a

    module b
      use a
    end module b

    module c
      use b
      use iso_fortran_env
      use external_mod

      type base
      end type base

      type, extends(base) :: derived
      end type derived

      type, extends(derived) :: leaf
        type(external_type) :: component
      end type leaf

      type thing
        type(derived) :: part
      end type thing

      type alpha
      contains
        procedure :: five
        procedure :: six
        procedure :: ei => eight
        procedure :: ni => nine
        procedure :: ten
        generic :: eight_nine => ei, ni
      end type alpha

      private :: ten

      interface
        subroutine defined_elsewhere
        end subroutine

        module subroutine submod_proc
        end subroutine
      end interface

    contains
      subroutine one
      end subroutine one
      subroutine two
        call one
      end subroutine two
      subroutine five
      end subroutine five
      function six(this) result(res)
        real :: res
        res = 1
      end function six
      subroutine seven
        contains
          call seven_one
          call seven_two
          subroutine seven_one
            call seven_two
          end subroutine seven_one
          subroutine seven_two
            call one
          end subroutine seven_two
      end subroutine seven
      subroutine eight(this,x)
        class(alpha) :: this
        real :: x
      end subroutine eight
      subroutine nine(this,x)
        class(alpha) :: this
        integer :: x
      end subroutine nine
      subroutine ten(this)
        class(alpha) :: this
      end subroutine then
    end module c

    submodule (c) c_submod
    end submodule c_submod

    submodule (c:c_submod) c_subsubmod
    !! display: private
    contains
      module subroutine submod_proc
      end subroutine
    end submodule c_subsubmod

    program foo
      use c
      call three
      real :: x
      type(alpha) :: y
      call y%five()
      x = y%six()
      call y%ei(1.0)
      call y%eight_nine(1.0)
      call y%ten()
    contains
      subroutine three
        use external_mod
        call one
        call two
        call two
        call other_sub
      end subroutine three

      recursive subroutine four
        call four
      end subroutine four
    end program foo
    """
    # check if we've already created the graphs for this test
    request_params = getattr(request, "param", {})
    proc_internals = request_params.get("proc_internals", False)
    if f"proc_internals_{proc_internals}" in project_graphs:
        yield project_graphs[f"proc_internals_{proc_internals}"]
        return

    src_dir = tmp_path_factory.getbasetemp() / "graphs" / "src"
    src_dir.mkdir(exist_ok=True, parents=True)
    full_filename = src_dir / "test.f90"
    with open(full_filename, "w") as f:
        f.write(dedent(data))

    settings = ProjectSettings(
        src_dir=src_dir, graph=True, proc_internals=proc_internals
    )
    project = create_project(settings)

    graphs = GraphManager(
        graphdir="",
        parentdir="..",
        coloured_edges=True,
        show_proc_parent=proc_internals,
    )
    for entity_list in [
        project.types,
        project.procedures,
        project.submodprocedures,
        project.modules,
        project.submodules,
        project.programs,
        project.files,
        project.blockdata,
    ]:
        for item in entity_list:
            graphs.register(item)

    graphs.graph_all()
    graphs.output_graphs(0)

    # save graphs for future use
    project_graphs[f"proc_internals_{proc_internals}"] = graphs

    yield graphs
    # reset namelist so it doesn't affect future generated graphs
    ford.sourceform.namelist = ford.sourceform.NameSelector()


MOD_GRAPH_KEY = ["Module", "Submodule", "Subroutine", "Function", "Program"]
PROC_GRAPH_KEY = [
    "Subroutine",
    "Function",
    "Interface",
    "Type Bound Procedure",
    "Unknown Procedure Type",
    "Program",
]
TYPE_GRAPH_KEY = ["Type"]


@pytest.mark.skipif(not graphviz_installed, reason="Requires graphviz")
@pytest.mark.parametrize(
    (
        "make_project_graphs",
        "graph_name",
        "expected_nodes",
        "expected_edges",
        "expected_legend_nodes",
    ),
    [
        (
            {"proc_internals": False},
            ["usegraph"],
            [
                "a",
                "b",
                "c",
                "c_submod",
                "c_subsubmod",
                "iso_fortran_env",
                "external_mod",
                "three",
                "foo",
            ],
            [
                "module~b->module~a",
                "module~c->module~b",
                "module~c->iso_fortran_env",
                "module~c->external_mod",
                "module~c_submod->module~c",
                "module~c_subsubmod->module~c_submod",
                "proc~three->external_mod",
                "program~foo->module~c",
            ],
            MOD_GRAPH_KEY,
        ),
        (
            {"proc_internals": False},
            ["callgraph"],
            [
                "defined_elsewhere",
                "submod_proc",
                "submod_proc",
                "one",
                "three",
                "two",
                "four",
                "other_sub",
                "foo",
                "alpha%five",
                "alpha%six",
                "seven",
                "alpha%eight",
                "alpha%nine",
                "alpha%eight_nine",
                "alpha%ten",
            ],
            [
                "proc~three->proc~one",
                "proc~three->proc~two",
                "proc~two->proc~one",
                "proc~three->other_sub",
                "program~foo->proc~three",
                "proc~four->proc~four",
                "program~foo->proc~five",
                "program~foo->proc~six",
                "proc~seven->proc~one",
                "program~foo->proc~eight",
                "program~foo->none~eight_nine",
                "none~eight_nine->proc~eight",
                "none~eight_nine->proc~nine",
                "interface~submod_proc->proc~submod_proc",
                "program~foo->none~ten",
            ],
            PROC_GRAPH_KEY,
        ),
        (
            {"proc_internals": True},
            ["callgraph"],
            [
                "c::defined_elsewhere",
                "c::submod_proc",
                "c_subsubmod::submod_proc",
                "c::one",
                "foo::three",
                "c::two",
                "foo::four",
                "other_sub",
                "foo",
                "c::alpha%five",
                "c::alpha%six",
                "c::seven",
                "seven::seven_one",
                "seven::seven_two",
                "c::alpha%eight",
                "c::alpha%nine",
                "c::alpha%eight_nine",
                "c::alpha%ten",
            ],
            [
                "proc~three->proc~one",
                "proc~three->proc~two",
                "proc~two->proc~one",
                "proc~three->other_sub",
                "program~foo->proc~three",
                "proc~four->proc~four",
                "program~foo->proc~five",
                "program~foo->proc~six",
                "proc~seven->none~seven_one",
                "proc~seven->none~seven_two",
                "none~seven_one->none~seven_two",
                "none~seven_two->proc~one",
                "program~foo->proc~eight",
                "program~foo->none~eight_nine",
                "none~eight_nine->proc~eight",
                "none~eight_nine->proc~nine",
                "interface~submod_proc->proc~submod_proc",
                "program~foo->none~ten",
            ],
            PROC_GRAPH_KEY,
        ),
        (
            {"proc_internals": False},
            ["typegraph"],
            ["base", "derived", "leaf", "external_type", "thing", "alpha"],
            [
                "type~leaf->type~derived",
                "type~derived->type~base",
                "type~leaf->external_type",
                "type~thing->type~derived",
            ],
            TYPE_GRAPH_KEY,
        ),
        (
            {"proc_internals": False},
            ["modules", "b", "usesgraph"],
            ["a", "b"],
            ["module~b->module~a"],
            MOD_GRAPH_KEY,
        ),
        (
            {"proc_internals": False},
            ["modules", "b", "usedbygraph"],
            ["b", "c", "c_submod", "c_subsubmod", "foo"],
            [
                "module~c->module~b",
                "module~c_submod->module~c",
                "module~c_subsubmod->module~c_submod",
                "program~foo->module~c",
            ],
            MOD_GRAPH_KEY,
        ),
        (
            {"proc_internals": False},
            ["types", "derived", "inhergraph"],
            ["base", "derived"],
            ["type~derived->type~base"],
            TYPE_GRAPH_KEY,
        ),
        (
            {"proc_internals": False},
            ["types", "derived", "inherbygraph"],
            ["derived", "leaf", "thing"],
            ["type~leaf->type~derived", "type~thing->type~derived"],
            TYPE_GRAPH_KEY,
        ),
        (
            {"proc_internals": False},
            ["procedures", "two", "callsgraph"],
            ["one", "two"],
            ["proc~two->proc~one"],
            PROC_GRAPH_KEY,
        ),
        (
            {"proc_internals": True},
            ["procedures", "seven", "callsgraph"],
            ["c::seven", "c::one", "seven::seven_one", "seven::seven_two"],
            [
                "proc~seven->none~seven_one",
                "proc~seven->none~seven_two",
                "none~seven_one->none~seven_two",
                "none~seven_two->proc~one",
            ],
            PROC_GRAPH_KEY,
        ),
        (
            {"proc_internals": False},
            ["procedures", "two", "calledbygraph"],
            ["three", "two", "foo"],
            ["proc~three->proc~two", "program~foo->proc~three"],
            PROC_GRAPH_KEY,
        ),
        (
            {"proc_internals": False},
            ["procedures", "three", "usesgraph"],
            ["external_mod", "three"],
            ["proc~three->external_mod"],
            MOD_GRAPH_KEY,
        ),
        (
            {"proc_internals": True},
            [
                "procedures",
                # This is awful, but both the interface and the
                # implementation have the same name, so we need to
                # further disambiguate them
                {"name": "submod_proc", "proctype": "Interface"},
                "callsgraph",
            ],
            ["c::submod_proc", "c_subsubmod::submod_proc"],
            [
                "interface~submod_proc->proc~submod_proc",
            ],
            PROC_GRAPH_KEY,
        ),
    ],
    indirect=["make_project_graphs"],
)
def test_graphs(
    make_project_graphs,
    graph_name,
    expected_nodes,
    expected_edges,
    expected_legend_nodes,
):
    graphs = make_project_graphs

    # Get the graph we want from the graph manager. This might be a
    # top-level graph, showing an overview of the project, or it might
    # be a graph for a particular object. In the latter case, we need
    # to also find the object from the appropriate collection
    if len(graph_name) == 1:
        graph = getattr(graphs, graph_name[0])
    else:
        collection, properties, name = graph_name

        if isinstance(properties, str):
            properties = {"name": properties}

        for g in sorted(getattr(graphs, collection)):
            if properties == {attr: getattr(g, attr, None) for attr in properties}:
                break
        graph = getattr(g, name)

    soup = BeautifulSoup(str(graph), features="html.parser")
    # Get nodes and edges just in the graph, and not in the legend
    node_names = [s.find("text").text for s in soup.svg.find_all("g", class_="node")]
    edge_names = [s.title.text for s in soup.svg.find_all("g", class_="edge")]

    assert sorted(node_names) == sorted(expected_nodes)
    assert sorted(edge_names) == sorted(expected_edges)

    svgs = soup.find_all("svg")
    assert len(svgs) == 2, "Graph and legend"

    legend = svgs[1]
    legend_nodes = [s.title.text for s in legend.find_all("g", class_="node")]
    assert legend_nodes == expected_legend_nodes + ["This Page's Entity"]
    assert legend.find_all("g", class_="edge") == []


@pytest.mark.skipif(not graphviz_installed, reason="Requires graphviz")
def test_external_module_links(make_project_graphs):
    graphs = make_project_graphs

    soup = BeautifulSoup(str(graphs.usegraph), features="html.parser")
    iso_fortran_env_node = soup.find(string="iso_fortran_env").parent.parent
    link = iso_fortran_env_node.a["xlink:href"]
    assert link == INTRINSIC_MODS["iso_fortran_env"]


def test_graphs_as_table(tmp_path):
    data = """\
    program foo
    contains
      subroutine one
      end subroutine one

      subroutine a
        call one()
      end subroutine a

      subroutine b
        call one()
      end subroutine b

      subroutine c
        call one()
      end subroutine c

      subroutine d
        call one()
      end subroutine d

      subroutine e
        call one()
      end subroutine e

      subroutine f
        call one()
      end subroutine f

      subroutine g
        call one()
      end subroutine g

      subroutine h
        call one()
      end subroutine h
    end program foo
    """

    src_dir = tmp_path / "graphs" / "src"
    src_dir.mkdir(exist_ok=True, parents=True)
    full_filename = src_dir / "test.f90"
    with open(full_filename, "w") as f:
        f.write(dedent(data))

    settings = ProjectSettings(src_dir=src_dir, graph=True, graph_maxnodes=4)
    project = create_project((settings))

    graphs = GraphManager(
        graphdir="", parentdir="..", coloured_edges=True, show_proc_parent=True
    )
    for entity_list in [
        project.procedures,
        project.programs,
    ]:
        for item in entity_list:
            graphs.register(item)

    graphs.graph_all()
    graphs.output_graphs(0)

    for graph in graphs.procedures:
        if graph.name == "one":
            break
    graph = graph.calledbygraph

    soup = BeautifulSoup(str(graph), features="html.parser")
    node_names = sorted([n.text for n in soup.table.find_all(class_="node")])
    num_arrows = len(soup.table.find_all(class_="triangle-right"))
    # These are the spacing 'w's
    num_ws = len(soup.table.find_all(class_="solidBottom"))

    expected_node_names = [
        "foo::a",
        "foo::b",
        "foo::c",
        "foo::d",
        "foo::e",
        "foo::f",
        "foo::g",
        "foo::h",
    ]

    assert node_names == expected_node_names
    assert num_arrows == len(expected_node_names)
    assert num_ws == len(expected_node_names)