import fitz
from pptx import Presentation
from pptx.util import Emu, Inches
import io

PDF_PATH = r"C:\Users\jhodgkin\Pictures\Holy Places Flip Chart.pdf"
OUT_PATH = r"C:\Users\jhodgkin\Pictures\Holy Places Flip Chart.pptx"
DPI = 150

SLIDE_W = Inches(13.333)  # widescreen landscape
SLIDE_H = Inches(7.5)
GAP = Inches(0.1)

doc = fitz.open(PDF_PATH)
prs = Presentation()
prs.slide_width = SLIDE_W
prs.slide_height = SLIDE_H
blank_layout = prs.slide_layouts[6]

def render_page(page):
    mat = fitz.Matrix(DPI / 72, DPI / 72)
    pix = page.get_pixmap(matrix=mat, alpha=False)
    return io.BytesIO(pix.tobytes("png")), pix.width, pix.height

def add_single_slide(page, label):
    img, pw, ph = render_page(page)
    slide = prs.slides.add_slide(blank_layout)
    aspect = pw / ph
    h = SLIDE_H
    w = int(h * aspect)
    if w > SLIDE_W:
        w = SLIDE_W
        h = int(w / aspect)
    left = (SLIDE_W - w) // 2
    top = (SLIDE_H - h) // 2
    slide.shapes.add_picture(img, left, top, width=w, height=h)
    print(f"  Slide: {label}")

def add_pair_slide(page_a, page_b, label):
    img_a, pw_a, ph_a = render_page(page_a)
    img_b, pw_b, ph_b = render_page(page_b)
    slide = prs.slides.add_slide(blank_layout)

    usable_w = (SLIDE_W - GAP) // 2

    def fit(pw, ph):
        aspect = pw / ph
        h = SLIDE_H
        w = int(h * aspect)
        if w > usable_w:
            w = usable_w
            h = int(w / aspect)
        return w, h

    wa, ha = fit(pw_a, ph_a)
    wb, hb = fit(pw_b, ph_b)

    top_a = (SLIDE_H - ha) // 2
    top_b = (SLIDE_H - hb) // 2

    # Center the pair horizontally
    total_w = wa + GAP + wb
    left_a = (SLIDE_W - total_w) // 2
    left_b = left_a + wa + GAP

    slide.shapes.add_picture(img_a, left_a, top_a, width=wa, height=ha)
    slide.shapes.add_picture(img_b, left_b, top_b, width=wb, height=hb)
    print(f"  Slide: {label}")

pages = list(doc)

# Page 1 alone
add_single_slide(pages[0], "page 1")

# Pages 2+ in pairs
for i in range(1, len(pages), 2):
    if i + 1 < len(pages):
        add_pair_slide(pages[i], pages[i + 1], f"pages {i+1}+{i+2}")
    else:
        add_single_slide(pages[i], f"page {i+1}")

prs.save(OUT_PATH)
print(f"\nSaved: {OUT_PATH}")