import pytest


def test_paginated_children(pad):
    page1 = pad.get("/projects", page_num=1)

    assert page1 is not None
    assert page1["_model"] == "projects"
    assert page1["_template"] == "projects.html"

    assert page1.datamodel.pagination_config.per_page == 4

    assert page1.children.count() == 8
    assert page1.page_num == 1
    assert page1.pagination.items.count() == 4

    children = page1.pagination.items.all()
    assert len(children) == 4
    assert [x["name"] for x in children] == [
        "Coffee",
        "Bagpipe",
        "Master",
        "Oven",
    ]

    assert ("projects", "en", "1") in pad.cache.persistent
    assert ("projects", "en", "2") not in pad.cache.persistent

    page2 = pad.get("/projects", page_num=2)

    assert page2.children.count() == 8
    assert page2.page_num == 2
    assert page2.pagination.items.count() == 3

    children = page2.pagination.items.all()
    assert len(children) == 3
    assert [x["name"] for x in children] == [
        "Postage",
        "Slave",
        "Wolf",
    ]

    assert ("projects", "en", "2") in pad.cache.persistent


def test_unpaginated_children(pad):
    page_all = pad.get("/projects")

    assert page_all

    assert page_all.pagination.items.count() == 7
    assert page_all.page_num is None

    children = page_all.pagination.items.all()
    assert len(children) == 7
    assert [x["name"] for x in children] == [
        "Coffee",
        "Bagpipe",
        "Master",
        "Oven",
        "Postage",
        "Slave",
        "Wolf",
    ]


def test_pagination_access(pad):
    page = pad.get("/projects", page_num=1)

    assert page.pagination.page == 1
    assert page.pagination.next.pagination.page == 2
    assert page.pagination.for_page(2).pagination.page == 2

    assert page.pagination.for_page(0) is None
    assert page.pagination.for_page(3) is None

    assert pad.get("/projects@1").page_num == 1
    assert pad.get("/projects@2").page_num == 2
    assert pad.get("/projects@3").page_num == 3


def test_pagination_attributes(pad):
    page = pad.get("/projects", page_num=1)
    assert page.pagination.current is page
    assert page.pagination.next is not None
    assert page.pagination.next.page_num == 2
    assert page.pagination.prev is None
    assert page.pagination.pages == 2
    assert page.pagination.prev_num is None
    assert page.pagination.next_num == 2
    assert page.pagination.has_next
    assert not page.pagination.has_prev

    page = page.pagination.next
    assert page.pagination.current is page
    assert page.pagination.next is None
    assert page.pagination.prev.page_num == 1
    assert not page.pagination.has_next
    assert page.pagination.next is None
    assert page.pagination.next_num is None


def test_url_matching_for_pagination(pad):
    page1 = pad.resolve_url_path("/projects/")
    assert page1.page_num == 1

    page2 = pad.resolve_url_path("/projects/page/2/")
    assert page2.page_num == 2

    page1_explicit = pad.resolve_url_path("/projects/page/1/")
    assert page1_explicit is None


def test_parent_access(pad):
    page2 = pad.resolve_url_path("/projects/page/2/")
    assert page2["_path"] == "/projects"
    assert page2.path == "/projects@2"
    assert page2.page_num == 2

    child = page2.pagination.items.first()
    assert child.parent.path == page2["_path"]
    assert child.parent.page_num is None


def test_pagination_url_paths(pad):
    # Even though this is paginated, getting to the non paginated version
    # just looks like going to the first page.  We do this because it
    # is more convenient for usage.
    project = pad.get("/projects")
    assert project.url_path == "/projects/"

    # However first page looks the same
    project = pad.get("/projects", page_num=1)
    assert project.url_path == "/projects/"

    # second page is different
    project = pad.get("/projects", page_num=2)
    assert project.url_path == "/projects/page/2/"


def test_unpaginated_children_other_alt(pad):
    page_all = pad.get("/projects", alt="de")

    assert page_all.pagination.items.count() == 8
    assert page_all.page_num is None

    children = page_all.pagination.items.all()
    assert len(children) == 8
    assert [x["name"] for x in children] == [
        "Kaffee",
        "Dudelsack",
        "Meister",
        "Ofen",
        "Porto",
        "Sklave",
        "Wolf",
        "Zaun",
    ]


def test_prev_next(pad):
    # coffee, bagpipe, filtered, master have seq numbers 9, 8, 7, 6.
    # They disagree with alphabetization, to ensure we use the pagination
    # query order, "-seq".
    bagpipe = pad.get("/projects/bagpipe")
    assert bagpipe.get_siblings().prev_page["_id"] == "coffee"

    # Next child "filtered" is skipped by pagination query, skip to "master".
    assert bagpipe.get_siblings().next_page["_id"] == "master"

    # Postage is on the previous page before oven, but prev / next ignore pages.
    oven = pad.get("/projects/oven")
    assert oven.get_siblings().prev_page["_id"] == "master"
    assert oven.get_siblings().next_page["_id"] == "postage"


def test_url_matching_for_alt_pagination(pad):
    page1 = pad.resolve_url_path("/de/projects/")
    assert page1.alt == "de"
    assert page1.page_num == 1

    page2 = pad.resolve_url_path("/de//projects/page/2/")
    assert page2.alt == "de"
    assert page2.page_num == 2

    page1_explicit = pad.resolve_url_path("/de/projects/page/1/")
    assert page1_explicit is None


def test_pagination_items_filter(pad):
    # This tests that items are excluded from the pagination based on a
    # query if needed.
    blog = pad.get("/blog", page_num=1)
    assert blog.datamodel.pagination_config.items == "this.children.filter(F._model == 'blog-post')"

    assert blog.children.count() == 3
    assert sorted(x["_id"] for x in blog.children) == ["dummy.xml", "post1", "post2"]

    assert blog.pagination.items.count() == 2
    # Sort order is pub_date descending, so post 2 is first.
    assert blog.pagination.items.first()["_id"] == "post2"

    dummy = blog.children.get("dummy.xml")
    assert dummy is not None
    assert dummy["_model"] == "none"


def test_virtual_path_behavior(pad):
    # Base record
    blog = pad.get("/blog")
    assert blog.path == "/blog"
    assert blog["_path"] == "/blog"
    assert blog.page_num is None
    assert blog.url_path == "/blog/"
    assert blog.record is blog

    # Record for page 1 which is a bit special
    blog_page1 = pad.get("/blog@1")
    assert blog_page1.path == "/blog@1"
    assert blog_page1["_path"] == "/blog"
    assert blog_page1.url_path == "/blog/"
    assert blog_page1.page_num == 1
    assert blog_page1.parent is pad.root
    assert blog_page1.record is blog

    # Record for page 2 which is slightly less special
    blog_page2 = pad.get("/blog@2")
    assert blog_page2.path == "/blog@2"
    assert blog_page2["_path"] == "/blog"
    assert blog_page2.url_path == "/blog/page/2/"
    assert blog_page2.page_num == 2
    assert blog_page2.parent is pad.root
    assert blog_page2.record is blog

    # Make sure URL generation works as you would expect:
    assert blog.url_to("@1", absolute=True) == "/blog/"
    assert blog.url_to("@2", absolute=True) == "/blog/page/2/"
    assert blog.url_to("..", absolute=True) == "/"
    assert blog_page2.url_to("..", absolute=True) == "/"
    assert blog_page2.url_to("@1", absolute=True) == "/blog/"
    assert blog_page2.url_to("@3", absolute=True) == "/blog/page/3/"


@pytest.fixture
def pagination(pad, page, pages, monkeypatch):
    projects = pad.get("/projects", page_num=1)
    pagination = projects.pagination
    # hack in the desired page and total
    monkeypatch.setattr(pagination, "page", page)
    monkeypatch.setattr(pagination, "total", pages)
    monkeypatch.setattr(pagination, "per_page", 1)
    assert pagination.pages == pages
    return pagination


@pytest.mark.parametrize(
    (
        "page",
        "pages",
        "left_edge",
        "left_current",
        "right_current",
        "right_edge",
        "expected",
    ),
    [
        (1, 9, 0, 0, 0, 0, [1, None]),
        (2, 9, 0, 0, 0, 0, [None, 2, None]),
        (8, 9, 0, 0, 0, 0, [None, 8, None]),
        (9, 9, 0, 0, 0, 0, [None, 9]),
        (1, 9, 1, 0, 0, 1, [1, None, 9]),
        (2, 9, 1, 0, 0, 1, [1, 2, None, 9]),
        (3, 9, 1, 0, 0, 1, [1, None, 3, None, 9]),
        (7, 9, 1, 0, 0, 1, [1, None, 7, None, 9]),
        (8, 9, 1, 0, 0, 1, [1, None, 8, 9]),
        (9, 9, 1, 0, 0, 1, [1, None, 9]),
        (1, 9, 0, 1, 1, 0, [1, 2, None]),
        (2, 9, 0, 1, 1, 0, [1, 2, 3, None]),
        (3, 9, 0, 1, 1, 0, [None, 2, 3, 4, None]),
        (7, 9, 0, 1, 1, 0, [None, 6, 7, 8, None]),
        (8, 9, 0, 1, 1, 0, [None, 7, 8, 9]),
        (9, 9, 0, 1, 1, 0, [None, 8, 9]),
        (1, 9, 1, 1, 1, 1, [1, 2, None, 9]),
        (2, 9, 1, 1, 1, 1, [1, 2, 3, None, 9]),
        (3, 9, 1, 1, 1, 1, [1, 2, 3, 4, None, 9]),
        (4, 9, 1, 1, 1, 1, [1, None, 3, 4, 5, None, 9]),
        (6, 9, 1, 1, 1, 1, [1, None, 5, 6, 7, None, 9]),
        (7, 9, 1, 1, 1, 1, [1, None, 6, 7, 8, 9]),
        (8, 9, 1, 1, 1, 1, [1, None, 7, 8, 9]),
        (9, 9, 1, 1, 1, 1, [1, None, 8, 9]),
    ],
)
def test_iter_pages(
    pagination,
    page,
    left_edge,
    left_current,
    right_current,
    right_edge,
    expected,
):
    assert list(pagination.iter_pages(left_edge, left_current, right_current, right_edge)) == expected