# All comments in English.

from pptx import Presentation
from odf.opendocument import load
from odf.draw import Page
from odf.text import P

def normalize_newlines(value):
    if value is None:
        return ""
    return (
        str(value)
        .replace("\r\n", "\\n")
        .replace("\n\r", "\\n")
        .replace("\r", "\\n")
        .replace("\n", "\\n")
    )

def convert_pptx(path):
    prs = Presentation(path)
    slides = []
    for idx, slide in enumerate(prs.slides, start=1):
        texts = []
        for shape in slide.shapes:
            if hasattr(shape, "text"):
                texts.append(normalize_newlines(shape.text))
        slides.append((f"Slide_{idx}", "\n".join(texts)))
    return slides

def convert_ppt(path):
    # PPT (binary) is not supported by python-pptx.
    # We convert using LibreOffice headless via subprocess.
    import subprocess, tempfile, os

    tmp = tempfile.mktemp(suffix=".pptx")
    subprocess.run(["soffice", "--headless", "--convert-to", "pptx", "--outdir", "/tmp", path])
    return convert_pptx(tmp)

def convert_odp(path):
    doc = load(path)
    slides = []
    idx = 1
    for page in doc.getElementsByType(Page):
        texts = []
        for p in page.getElementsByType(P):
            texts.append(normalize_newlines(p.firstChild.data if p.firstChild else ""))
        slides.append((f"Slide_{idx}", "\n".join(texts)))
        idx += 1
    return slides

def convert_presentation(path):
    if path.endswith(".pptx"):
        return convert_pptx(path)
    if path.endswith(".ppt"):
        return convert_ppt(path)
    if path.endswith(".odp"):
        return convert_odp(path)
    raise ValueError("Unsupported presentation format")