"""Tests for diagram renderer, schemes, and include cache."""

from __future__ import annotations

from pathlib import Path
from unittest.mock import patch

import pytest

from md2gost.diagram_includes import (
    include_cache_index_path,
    reset_include_cache,
    resolve_url,
    rewrite_http_includes_in_source,
)
from md2gost.diagram_renderer import (
    DIAGRAM_LANGS,
    configure_diagrams,
    diagram_engine_status,
    is_diagram_lang,
    prepare_source,
    render_diagram,
    resolve_plantuml_jar,
)
from md2gost.diagram_schemes import (
    DiagramScheme,
    apply_scheme,
    configure_schemes,
    ensure_user_schemes,
    prepare_with_schemes,
    scheme_id_from_lang,
    user_schemes_path,
)
from md2gost.extended_markdown import markdown
from md2gost.extended_markdown.caption import Caption as CapEl
from md2gost.renderable.caption import CaptionInfo
from md2gost.renderable.diagram import DiagramFigure
from md2gost.renderable.listing import Listing
from md2gost.renderable_factory import RenderableFactory


def test_prepare_uml_wraps_startuml():
    src, dtype = prepare_source("uml", "A -> B")
    assert "@startuml" in src
    assert dtype == "plantuml"


def test_prepare_c4_uses_scheme(tmp_path, monkeypatch):
    monkeypatch.chdir(tmp_path)
    ensure_user_schemes(tmp_path)
    configure_schemes(base=tmp_path)

    def fake_resolve(ref, *, base=None, schemes_dir=None):
        return str(tmp_path / "C4_Container.puml")

    with patch("md2gost.diagram_schemes.resolve_include_ref", side_effect=fake_resolve):
        src, dtype = prepare_with_schemes("c4", 'Person(user, "U")', base=tmp_path)
    assert dtype == "plantuml"
    assert "Person(user" in src
    assert "@startuml" in src.lower()
    assert "!include" in src


def test_prepare_uml_c4_alias(tmp_path, monkeypatch):
    monkeypatch.chdir(tmp_path)
    ensure_user_schemes(tmp_path)
    configure_schemes(base=tmp_path)

    def fake_resolve(ref, *, base=None, schemes_dir=None):
        return str(tmp_path / "stub.puml")

    with patch("md2gost.diagram_schemes.resolve_include_ref", side_effect=fake_resolve):
        src, dtype = prepare_with_schemes("uml-c4", 'Person(user, "U")', base=tmp_path)
    assert dtype == "plantuml"
    assert "Person(user" in src


def test_unknown_scheme_raises(tmp_path, monkeypatch):
    monkeypatch.chdir(tmp_path)
    ensure_user_schemes(tmp_path)
    configure_schemes(base=tmp_path)
    with pytest.raises(ValueError, match="не найдена"):
        prepare_with_schemes("uml-nosuch", "A -> B", base=tmp_path)


def test_bpmn_scheme_prepare(tmp_path, monkeypatch):
    monkeypatch.chdir(tmp_path)
    ensure_user_schemes(tmp_path)
    configure_schemes(base=tmp_path)
    assert is_diagram_lang("bpmn")
    assert is_diagram_lang("uml-bpmn")
    src, dtype = prepare_with_schemes("bpmn", "Start(s)\nEnd(e)\nFlow(s, e)", base=tmp_path)
    assert dtype == "plantuml"
    assert "Start(s)" in src
    assert "!include" in src
    assert "BPMN.puml" in src.replace("\\", "/")
    assert src.lower().count("@startuml") == 1


def test_bundled_bpmn_survives_user_file_without_it(tmp_path, monkeypatch):
    monkeypatch.chdir(tmp_path)
    path = ensure_user_schemes(tmp_path)
    path.write_text('{"mine":{"title":"x","prefix":"","postfix":""}}\n', encoding="utf-8")
    configure_schemes(base=tmp_path)
    assert is_diagram_lang("mine")
    assert is_diagram_lang("bpmn")


def test_scheme_id_from_lang():
    assert scheme_id_from_lang("uml") is None
    assert scheme_id_from_lang("uml-c4") == "c4"
    assert scheme_id_from_lang("c4") == "c4"
    assert scheme_id_from_lang("bpmn") == "bpmn"
    assert scheme_id_from_lang("uml-bpmn") == "bpmn"


def test_ensure_user_schemes_once(tmp_path):
    path = ensure_user_schemes(tmp_path)
    assert path.is_file()
    assert "c4" in path.read_text(encoding="utf-8")
    path.write_text('{"mine":{"title":"x","prefix":"","postfix":""}}\n', encoding="utf-8")
    again = ensure_user_schemes(tmp_path)
    assert again == path
    assert "mine" in path.read_text(encoding="utf-8")
    assert path == user_schemes_path(tmp_path)


def test_apply_scheme_no_double_start():
    scheme = DiagramScheme(
        id="t",
        prefix="@startuml\nskinparam monochrome true\n",
        postfix="\n@enduml",
        includes=[],
    )
    out = apply_scheme(scheme, "@startuml\nA -> B\n@enduml")
    assert out.lower().count("@startuml") == 1
    assert "skinparam monochrome true" in out


def test_include_cache_index_no_overwrite(tmp_path, monkeypatch):
    monkeypatch.chdir(tmp_path)
    calls = []

    def fake_get(url, timeout=60):
        calls.append(url)

        class Resp:
            content = f"' from {url}\n".encode("utf-8")

            def raise_for_status(self):
                return None

        return Resp()

    with patch("md2gost.diagram_includes.requests.get", side_effect=fake_get):
        p1 = resolve_url("https://example.com/a.puml", base=tmp_path)
        p2 = resolve_url("https://example.com/b.puml", base=tmp_path)
        assert p1 != p2
        assert p1.is_file() and p2.is_file()
        content1 = p1.read_bytes()
        # second resolve same URL — no new download
        p1b = resolve_url("https://example.com/a.puml", base=tmp_path)
        assert p1b == p1
        assert p1.read_bytes() == content1
        assert calls.count("https://example.com/a.puml") == 1
        assert include_cache_index_path(tmp_path).is_file()

    removed = reset_include_cache(tmp_path)
    assert removed >= 2
    assert not include_cache_index_path(tmp_path).is_file()


def test_rewrite_http_in_source(tmp_path, monkeypatch):
    monkeypatch.chdir(tmp_path)

    def fake_get(url, timeout=60):
        class Resp:
            content = b"rectangle x\n"

            def raise_for_status(self):
                return None

        return Resp()

    with patch("md2gost.diagram_includes.requests.get", side_effect=fake_get):
        src = "@startuml\n!include https://example.com/x.puml\nA->B\n@enduml"
        out = rewrite_http_includes_in_source(src, base=tmp_path)
        assert "https://example.com" not in out
        assert "!include " in out


def test_caption_plus_listing():
    doc = markdown.parse("%fig Demo +listing\n\n```uml\nA->B\n```\n")
    caps = [c for c in doc.children if isinstance(c, CapEl)]
    assert len(caps) == 1
    assert caps[0].with_listing is True
    assert caps[0].text == "Demo"
    assert caps[0].unique_name == "fig"


def test_caption_plus_landscape():
    doc = markdown.parse("%wide Big scheme +landscape\n\n```uml\nA->B\n```\n")
    caps = [c for c in doc.children if isinstance(c, CapEl)]
    assert caps[0].landscape is True
    assert caps[0].with_listing is False
    assert caps[0].text == "Big scheme"

    doc2 = markdown.parse("%t1 Широкая +listing +landscape\n\n|a|b|\n|-|-|\n|1|2|\n")
    caps2 = [c for c in doc2.children if isinstance(c, CapEl)]
    assert caps2[0].landscape is True
    assert caps2[0].with_listing is True
    assert caps2[0].text == "Широкая"


def test_caption_interrupts_paragraph():
    """% line right after text (no blank line) must still be Caption, not plain text."""
    from marko.block import FencedCode, Paragraph

    doc = markdown.parse(
        "Пишите так:\n"
        "%testuml test +landscape\n"
        "\n"
        "```uml\nA->B\n```\n"
    )
    caps = [c for c in doc.children if isinstance(c, CapEl)]
    assert len(caps) == 1
    assert caps[0].landscape is True
    assert caps[0].unique_name == "testuml"
    joined = ""
    for p in doc.children:
        if not isinstance(p, Paragraph):
            continue
        for ch in getattr(p, "children", []) or []:
            if hasattr(ch, "children") and isinstance(ch.children, str):
                joined += ch.children
    assert "%testuml" not in joined
    assert any(isinstance(c, FencedCode) and c.lang == "uml" for c in doc.children)


def test_factory_routes_uml_to_diagram():
    from docx import Document
    from md2gost import package_dir
    import os

    md = "%d1 Use case +listing\n\n```uml\n@startuml\nA -> B\n@enduml\n```\n"
    parsed = markdown.parse(md)
    doc = Document(os.path.join(package_dir(), "Template.docx"))
    factory = RenderableFactory(doc._body)
    caption = None
    renderables = []
    for el in parsed.children:
        from marko.block import BlankLine
        if isinstance(el, BlankLine):
            continue
        if isinstance(el, CapEl):
            caption = CaptionInfo(el.unique_name, el.text, el.with_listing)
            continue
        renderables.append(factory.create(el, caption))
        caption = None

    assert len(renderables) == 1
    assert isinstance(renderables[0], DiagramFigure)
    assert renderables[0].listing is not None
    assert isinstance(renderables[0].listing, Listing)


def test_render_diagram_uses_cache(tmp_path):
    png = b"\x89PNG\r\n\x1a\n" + b"\x00" * 20

    def fake_kroki(source, diagram_type, base_url, out_path, fmt="png"):
        out_path.write_bytes(png if fmt == "png" else b"<svg xmlns='http://www.w3.org/2000/svg'/>")
        return True

    configure_diagrams(fallback="remote", cache_dir=str(tmp_path))
    with patch("md2gost.diagram_renderer._render_plantuml_jar", return_value=False), \
         patch("md2gost.diagram_renderer._render_kroki", side_effect=fake_kroki):
        path1 = render_diagram("uml", "A -> B", cache_dir=str(tmp_path))
        path2 = render_diagram("uml", "A -> B", cache_dir=str(tmp_path))
    assert path1.png_path == path2.png_path
    assert open(path1.png_path, "rb").read().startswith(b"\x89PNG")


def test_render_diagram_off_raises(tmp_path):
    configure_diagrams(fallback="off", cache_dir=str(tmp_path))
    with patch("md2gost.diagram_renderer._render_plantuml_jar", return_value=False), \
         patch("md2gost.diagram_renderer._render_kroki", return_value=False):
        with pytest.raises(RuntimeError):
            render_diagram("uml", "A -> B", fallback="off", cache_dir=str(tmp_path))


def test_prepare_mermaid_no_startuml():
    src, dtype = prepare_source("mermaid", "flowchart LR\nA-->B")
    assert "@startuml" not in src.lower()
    assert dtype == "mermaid"
    assert "flowchart LR" in src
    src2, dtype2 = prepare_source("mmd", "sequenceDiagram\nA->>B: hi")
    assert dtype2 == "mermaid"
    assert "@startuml" not in src2.lower()


def test_plantuml_scale_injected_into_render_cache(tmp_path):
    from md2gost.diagram_renderer import _ensure_plantuml_png_scale

    boosted = _ensure_plantuml_png_scale("@startuml\nA -> B\n@enduml")
    assert "scale 2" in boosted
    # author override kept
    custom = _ensure_plantuml_png_scale("@startuml\nscale 1.5\nA -> B\n@enduml")
    assert custom.count("scale") == 1
    assert "scale 1.5" in custom

    png = b"\x89PNG\r\n\x1a\n" + b"\x00" * 20
    seen = []

    def fake_kroki(source, diagram_type, base_url, out_path, fmt="png"):
        seen.append(source)
        out_path.write_bytes(png if fmt == "png" else b"<svg/>")
        return True

    configure_diagrams(fallback="remote", cache_dir=str(tmp_path), diagram_scale=3)
    with patch("md2gost.diagram_renderer._render_plantuml_jar", return_value=False), \
         patch("md2gost.diagram_renderer._render_kroki", side_effect=fake_kroki):
        result = render_diagram("uml", "A -> B", cache_dir=str(tmp_path))
    assert seen and "scale 3" in seen[0]
    assert result.pixel_scale == 3


def test_diagram_scale_one_skips_inject(tmp_path):
    png = b"\x89PNG\r\n\x1a\n" + b"\x00" * 20
    seen = []

    def fake_kroki(source, diagram_type, base_url, out_path, fmt="png"):
        seen.append(source)
        out_path.write_bytes(png)
        return True

    configure_diagrams(fallback="remote", cache_dir=str(tmp_path), diagram_scale=1)
    with patch("md2gost.diagram_renderer._render_plantuml_jar", return_value=False), \
         patch("md2gost.diagram_renderer._render_kroki", side_effect=fake_kroki):
        result = render_diagram("uml", "A -> B", cache_dir=str(tmp_path), diagram_scale=1)
    assert seen and "scale " not in seen[0].split("@startuml", 1)[-1].split("A -> B")[0]
    assert result.pixel_scale == 1


def test_is_diagram_lang_mermaid():
    assert is_diagram_lang("mermaid")
    assert is_diagram_lang("mmd")
    assert "mermaid" in DIAGRAM_LANGS
    assert "mmd" in DIAGRAM_LANGS


def test_render_mermaid_skips_jar(tmp_path):
    png = b"\x89PNG\r\n\x1a\n" + b"\x00" * 20
    calls = {"jar": 0, "kroki": []}

    def fake_jar(*args, **kwargs):
        calls["jar"] += 1
        return False

    def fake_kroki(source, diagram_type, base_url, out_path, fmt="png"):
        calls["kroki"].append((diagram_type, fmt, base_url))
        if fmt == "png":
            out_path.write_bytes(png)
        else:
            out_path.write_bytes(b"<svg xmlns='http://www.w3.org/2000/svg'/>")
        return True

    configure_diagrams(fallback="remote", cache_dir=str(tmp_path))
    with patch("md2gost.diagram_renderer._render_plantuml_jar", side_effect=fake_jar), \
         patch("md2gost.diagram_renderer._render_kroki", side_effect=fake_kroki):
        result = render_diagram("mermaid", "flowchart LR\nA-->B", cache_dir=str(tmp_path))
    assert calls["jar"] == 0
    assert any(t == "mermaid" and f == "png" for t, f, _ in calls["kroki"])
    assert Path(result.png_path).read_bytes().startswith(b"\x89PNG")
    assert result.svg_path is None


def test_render_diagram_svg_asks_both_formats(tmp_path):
    png = b"\x89PNG\r\n\x1a\n" + b"\x00" * 20
    svg = b'<svg xmlns="http://www.w3.org/2000/svg"><rect/></svg>'
    fmts = []

    def fake_kroki(source, diagram_type, base_url, out_path, fmt="png"):
        fmts.append(fmt)
        out_path.write_bytes(png if fmt == "png" else svg)
        return True

    configure_diagrams(fallback="remote", cache_dir=str(tmp_path), diagram_format="svg")
    with patch("md2gost.diagram_renderer._render_plantuml_jar", return_value=False), \
         patch("md2gost.diagram_renderer._render_kroki", side_effect=fake_kroki):
        result = render_diagram(
            "uml", "A -> B", cache_dir=str(tmp_path), diagram_format="svg",
        )
    assert "png" in fmts and "svg" in fmts
    assert result.svg_path is not None
    assert Path(result.svg_path).read_bytes().startswith(b"<svg")
    assert Path(result.png_path).read_bytes().startswith(b"\x89PNG")


def test_attach_svg_blip():
    from docx import Document
    from md2gost.docx_svg import attach_svg_blip, SVG_BLIP_URI

    doc = Document()
    run = doc.add_paragraph().add_run()
    # minimal valid-ish PNG (1x1)
    from io import BytesIO
    from PIL import Image as PILImage

    buf = BytesIO()
    PILImage.new("RGB", (8, 8), color=(255, 0, 0)).save(buf, format="PNG")
    buf.seek(0)
    picture = run.add_picture(buf)

    import tempfile
    with tempfile.TemporaryDirectory() as tmp:
        svg = Path(tmp) / "d.svg"
        svg.write_text(
            '<svg xmlns="http://www.w3.org/2000/svg" width="10" height="10">'
            '<rect width="10" height="10"/></svg>',
            encoding="utf-8",
        )
        assert attach_svg_blip(run, picture, svg)

    xml = picture._inline.xml
    assert "svgBlip" in xml
    assert SVG_BLIP_URI in xml
    # two image relationships on the document part
    image_rels = [
        r for r in doc.part.rels.values()
        if "image" in (r.reltype or "")
    ]
    assert len(image_rels) >= 2


def test_resolve_plantuml_jar_explicit(tmp_path):
    jar = tmp_path / "plantuml.jar"
    jar.write_bytes(b"PK" + b"\x00" * 2000)
    assert resolve_plantuml_jar(str(jar), download=False) == str(jar)
    missing = tmp_path / "nope.jar"
    assert resolve_plantuml_jar(str(missing), download=False) is None or (
        resolve_plantuml_jar(str(missing), download=False) != str(missing)
    )


def test_diagram_engine_status_mentions_java_or_kroki():
    text = diagram_engine_status()
    assert "Java" in text
    assert "PlantUML" in text


def test_diagram_langs():
    assert "uml" in DIAGRAM_LANGS
    assert "c4" in DIAGRAM_LANGS
    assert "bpmn" in DIAGRAM_LANGS
    assert is_diagram_lang("uml")
    assert is_diagram_lang("uml-c4")
    assert is_diagram_lang("uml-bpmn")


def test_render_bpmn_with_jar(tmp_path, monkeypatch):
    import shutil

    monkeypatch.chdir(tmp_path)
    ensure_user_schemes(tmp_path)
    configure_schemes(base=tmp_path)
    jar = resolve_plantuml_jar(download=False)
    if not shutil.which("java") or not jar:
        pytest.skip("нужны Java и plantuml.jar")
    configure_diagrams(fallback="off", cache_dir=str(tmp_path), plantuml_jar=jar)
    body = "\n".join(
        [
            "Start(s)",
            "StartMessage(sm, \"msg\")",
            "UserTask(t, \"Шаг\")",
            "XOR(gw)",
            "AND(p)",
            "OR(o)",
            "End(e)",
            "EndTerminate(et)",
            "Flow(s, t)",
            "Flow(t, gw)",
            "CondFlow(gw, e, \"да\")",
            "DefaultFlow(gw, et)",
        ]
    )
    result = render_diagram("bpmn", body, cache_dir=str(tmp_path), fallback="off")
    data = Path(result.png_path).read_bytes()
    assert data.startswith(b"\x89PNG")
    assert len(data) > 500