breakpilot-compliance/compliance-tts-service/slide_renderer.py

"""ImageMagick slide renderer for presentation videos."""
import logging
import os
import subprocess
import textwrap

logger = logging.getLogger(__name__)

# Slide dimensions
WIDTH = 1920
HEIGHT = 1080
HEADER_HEIGHT = 120
FOOTER_HEIGHT = 60
FONT = "DejaVu-Sans"
FONT_BOLD = "DejaVu-Sans-Bold"


def render_slide(
    heading: str,
    text: str,
    bullet_points: list[str],
    slide_number: int,
    total_slides: int,
    module_code: str,
    output_path: str,
) -> None:
    """Render a single slide as PNG using ImageMagick."""
    cmd = [
        "convert",
        "-size", f"{WIDTH}x{HEIGHT}",
        "xc:white",
        # Blue header bar
        "-fill", "#1e3a5f",
        "-draw", f"rectangle 0,0 {WIDTH},{HEADER_HEIGHT}",
        # Header text
        "-fill", "white",
        "-font", FONT_BOLD,
        "-pointsize", "42",
        "-gravity", "NorthWest",
        "-annotate", f"+60+{(HEADER_HEIGHT - 42) // 2}", heading[:80],
    ]

    y_pos = HEADER_HEIGHT + 40

    # Main text
    if text:
        wrapped = textwrap.fill(text, width=80)
        for line in wrapped.split("\n")[:6]:
            cmd.extend([
                "-fill", "#333333",
                "-font", FONT,
                "-pointsize", "28",
                "-gravity", "NorthWest",
                "-annotate", f"+60+{y_pos}", line,
            ])
            y_pos += 38

    y_pos += 20

    # Bullet points
    for bp in bullet_points[:8]:
        wrapped_bp = textwrap.fill(bp, width=75)
        first_line = True
        for line in wrapped_bp.split("\n"):
            prefix = "  •  " if first_line else "      "
            cmd.extend([
                "-fill", "#444444",
                "-font", FONT,
                "-pointsize", "26",
                "-gravity", "NorthWest",
                "-annotate", f"+60+{y_pos}", f"{prefix}{line}",
            ])
            y_pos += 34
            first_line = False
        y_pos += 8

    # Footer bar
    cmd.extend([
        "-fill", "#f0f0f0",
        "-draw", f"rectangle 0,{HEIGHT - FOOTER_HEIGHT} {WIDTH},{HEIGHT}",
        "-fill", "#888888",
        "-font", FONT,
        "-pointsize", "20",
        "-gravity", "SouthWest",
        "-annotate", f"+60+{(FOOTER_HEIGHT - 20) // 2}", f"{module_code}",
        "-gravity", "SouthEast",
        "-annotate", f"+60+{(FOOTER_HEIGHT - 20) // 2}", f"Folie {slide_number}/{total_slides}",
    ])

    cmd.append(output_path)

    result = subprocess.run(cmd, capture_output=True, text=True, timeout=30)
    if result.returncode != 0:
        raise RuntimeError(f"ImageMagick failed: {result.stderr}")


def render_title_slide(
    title: str,
    subtitle: str,
    output_path: str,
) -> None:
    """Render a title slide."""
    cmd = [
        "convert",
        "-size", f"{WIDTH}x{HEIGHT}",
        "xc:white",
        # Full blue background
        "-fill", "#1e3a5f",
        "-draw", f"rectangle 0,0 {WIDTH},{HEIGHT}",
        # Title
        "-fill", "white",
        "-font", FONT_BOLD,
        "-pointsize", "56",
        "-gravity", "Center",
        "-annotate", "+0-60", title[:60],
        # Subtitle
        "-fill", "#b0c4de",
        "-font", FONT,
        "-pointsize", "32",
        "-gravity", "Center",
        "-annotate", "+0+40", subtitle[:80],
        # Footer
        "-fill", "#6688aa",
        "-pointsize", "22",
        "-gravity", "South",
        "-annotate", "+0+30", "BreakPilot Compliance Training",
        output_path,
    ]

    result = subprocess.run(cmd, capture_output=True, text=True, timeout=30)
    if result.returncode != 0:
        raise RuntimeError(f"ImageMagick title slide failed: {result.stderr}")