"""Phase 1: the lazy node layer (Node/Element/Safe/Fragment/BaseComponent/Media).

These cover the new machinery directly and assert byte-for-byte parity between
``Element`` and the legacy ``Component()`` shim, so the migration of call sites
in later phases can rely on identical output.
"""

import unittest

from django.utils.safestring import SafeText, mark_safe

from common.components import (
    BaseComponent,
    Component,
    Element,
    Fragment,
    Media,
    Node,
    Safe,
    collect_media,
    render,
)


class ElementRenderTest(unittest.TestCase):
    def test_matches_legacy_component(self):
        element = Element("div", [("class", "test")], "hello")
        legacy = Component(
            tag_name="div", attributes=[("class", "test")], children="hello"
        )
        self.assertEqual(render(element), legacy)
        self.assertEqual(render(element), '<div class="test">hello</div>')

    def test_plain_string_children_escaped(self):
        self.assertEqual(
            render(Element("span", children=["<b>"])), "<span>&lt;b&gt;</span>"
        )

    def test_safe_children_pass_through(self):
        self.assertEqual(
            render(Element("span", children=[mark_safe("<b>x</b>")])),
            "<span><b>x</b></span>",
        )

    def test_node_children_render_safely(self):
        inner = Element("b", children=["x"])
        self.assertEqual(
            render(Element("span", children=[inner])), "<span><b>x</b></span>"
        )

    def test_legacy_component_renders_node_children(self):
        # The compatibility bridge: a string-returning legacy Component must
        # render nested Node children as HTML, not escape them.
        inner = Element("b", children=["x"])
        result = Component(tag_name="span", children=[inner])
        self.assertEqual(result, "<span><b>x</b></span>")
        self.assertIsInstance(result, SafeText)


class SafeAndFragmentTest(unittest.TestCase):
    def test_safe_passes_html_through(self):
        self.assertEqual(render(Safe("<i>raw</i>")), "<i>raw</i>")

    def test_fragment_concatenates(self):
        frag = Fragment(
            Element("span", children=["a"]), Element("span", children=["b"])
        )
        self.assertEqual(render(frag), "<span>a</span><span>b</span>")

    def test_fragment_skips_empty_children(self):
        frag = Fragment("", None, Element("span", children=["a"]))
        self.assertEqual(render(frag), "<span>a</span>")

    def test_fragment_escapes_plain_strings(self):
        self.assertEqual(render(Fragment("<x>", Safe("<y>"))), "&lt;x&gt;<y>")


class MediaTest(unittest.TestCase):
    def test_merge_dedups_preserving_order(self):
        merged = Media(js=["a.js", "b.js"]) + Media(js=["b.js", "c.js"])
        self.assertEqual(merged.js, ("a.js", "b.js", "c.js"))

    def test_external_kept_separate(self):
        merged = Media(js=["a.js"]) + Media(js_external=["umd.js"])
        self.assertEqual(merged.js, ("a.js",))
        self.assertEqual(merged.js_external, ("umd.js",))

    def test_sum_with_radd(self):
        merged = sum([Media(js=["a.js"]), Media(js=["b.js"])], Media())
        self.assertEqual(merged.js, ("a.js", "b.js"))

    def test_falsy_when_empty(self):
        self.assertFalse(Media())
        self.assertTrue(Media(js=["a.js"]))


class MediaCollectionTest(unittest.TestCase):
    def test_bubbles_through_element_children(self):
        class Widget(BaseComponent):
            media = Media(js=["widget.js"])

            def render(self) -> Node:
                return Element("div", children=["x"])

        tree = Element("section", children=[Element("div", children=[Widget()])])
        self.assertEqual(collect_media(tree).js, ("widget.js",))

    def test_bubbles_through_fragment(self):
        class Widget(BaseComponent):
            media = Media(js=["w.js"])

            def render(self) -> Node:
                return Element("div")

        self.assertEqual(collect_media(Fragment(Widget(), Element("p"))).js, ("w.js",))

    def test_component_merges_own_and_subtree_media(self):
        class Inner(BaseComponent):
            media = Media(js=["inner.js"])

            def render(self) -> Node:
                return Element("span")

        class Outer(BaseComponent):
            media = Media(js=["outer.js"])

            def render(self) -> Node:
                return Element("div", children=[Inner()])

        self.assertEqual(collect_media(Outer()).js, ("outer.js", "inner.js"))

    def test_bare_string_has_no_media(self):
        self.assertFalse(collect_media("just a string"))


if __name__ == "__main__":
    unittest.main()