"""REQ-239..243 (v1.20): S&P theme + slide render pipeline tests.

Validates:
  - The Marp deck frontmatter references nova-sp-theme.css
  - The CSS file contains the S&P colors (#D6002A, #1B1B1B)
  - The mermaid theme JSON contains the S&P colors
  - Every .mmd has a corresponding .png
  - The render_slides.sh script exists and is executable
  - The CI workflow file exists
"""
import re
from pathlib import Path

import pytest

ROOT = Path(__file__).resolve().parent.parent
PRESENTATIONS = ROOT / "docs" / "presentations"
ASSETS = PRESENTATIONS / "assets"
THEME_CSS = ASSETS / "nova-sp-theme.css"
THEME_JSON = ASSETS / "mmd" / "sp-theme.json"
MARP_DECK = PRESENTATIONS / "nova-no-humans-platform-marp.md"
RENDER_SCRIPT = ROOT / "scripts" / "render_slides.sh"
SLIDES_WORKFLOW = ROOT / ".github" / "workflows" / "slides.yml"


def test_sp_theme_css_exists():
    """REQ-239: nova-sp-theme.css exists."""
    assert THEME_CSS.is_file(), f"theme CSS not found: {THEME_CSS}"


def test_sp_theme_css_has_snp_colors():
    """REQ-239: CSS contains S&P Red and Black."""
    css = THEME_CSS.read_text()
    assert "#D6002A" in css, "S&P Red (#D6002A) missing from theme CSS"
    assert "#1B1B1B" in css, "S&P Black (#1B1B1B) missing from theme CSS"


def test_sp_theme_json_has_snp_colors():
    """The mermaid theme JSON also has S&P colors."""
    json_text = THEME_JSON.read_text()
    assert "#D6002A" in json_text, "S&P Red missing from mermaid theme"
    assert "#1B1B1B" in json_text, "S&P Black missing from mermaid theme"


def test_marp_deck_uses_sp_theme():
    """REQ-239: Marp deck frontmatter references nova-sp-theme.css."""
    text = MARP_DECK.read_text()
    # The frontmatter is between the first two ---
    fm_match = re.match(r'^---\n(.*?)\n---', text, re.DOTALL)
    assert fm_match, "Marp frontmatter not found"
    frontmatter = fm_match.group(1)
    assert "nova-sp" in frontmatter, \
        "Marp deck does not reference nova-sp theme"


def test_marp_deck_not_using_default_theme():
    """The Marp deck must not use 'theme: default'."""
    text = MARP_DECK.read_text()
    fm_match = re.match(r'^---\n(.*?)\n---', text, re.DOTALL)
    assert fm_match, "Marp frontmatter not found"
    frontmatter = fm_match.group(1)
    assert "theme: default" not in frontmatter, \
        "Marp deck still uses 'theme: default' — should use nova-sp-theme.css"


def test_render_slides_script_exists():
    """REQ-240: render_slides.sh exists and is executable."""
    assert RENDER_SCRIPT.is_file(), "render_slides.sh not found"
    import os
    assert os.access(RENDER_SCRIPT, os.X_OK), "render_slides.sh not executable"


def test_render_slides_script_renders_mermaid():
    """REQ-240: render_slides.sh renders mermaid diagrams."""
    text = RENDER_SCRIPT.read_text()
    assert "mermaid-cli" in text or "mmdc" in text, \
        "render_slides.sh does not invoke mermaid-cli"
    assert "sp-theme.json" in text, \
        "render_slides.sh does not reference sp-theme.json"


def test_render_slides_script_renders_marp():
    """REQ-240: render_slides.sh renders Marp HTML + PPTX."""
    text = RENDER_SCRIPT.read_text()
    assert "marp-cli" in text, "render_slides.sh does not invoke marp-cli"
    assert ".html" in text, "render_slides.sh does not produce HTML"
    assert ".pptx" in text, "render_slides.sh does not produce PPTX"


def test_slides_ci_workflow_exists():
    """REQ-241: CI workflow for slides exists."""
    assert SLIDES_WORKFLOW.is_file(), "slides.yml workflow not found"


def test_slides_ci_workflow_triggers_on_presentations():
    """REQ-241: CI workflow triggers on docs/presentations/ changes."""
    text = SLIDES_WORKFLOW.read_text()
    assert "docs/presentations" in text, \
        "slides.yml does not trigger on docs/presentations/"
    assert "render_slides.sh" in text, \
        "slides.yml does not invoke render_slides.sh"


def test_every_mmd_has_png():
    """REQ-240: every .mmd file has a corresponding .png."""
    mmd_dir = ASSETS / "mmd"
    png_dir = ASSETS / "png"
    if not mmd_dir.is_dir():
        pytest.skip("no .mmd directory")
    mmd_files = sorted(mmd_dir.glob("*.mmd"))
    assert len(mmd_files) > 0, "no .mmd files found"
    missing = []
    for mmd in mmd_files:
        png = png_dir / f"{mmd.stem}.png"
        if not png.is_file():
            missing.append(mmd.name)
    assert not missing, f"PNGs missing for: {missing}"


def test_readme_no_retired_decks():
    """REQ-243: presentations README does not list retired decks."""
    readme = (PRESENTATIONS / "README.md").read_text()
    assert "how-the-platform-works" not in readme, \
        "README still references retired 'how-the-platform-works' deck"
    assert "the-developer-experience" not in readme, \
        "README still references retired 'the-developer-experience' deck"