"""
Deep comparison of original vs translated PDF.

Outputs a detailed diff to identify exactly what format elements were lost.
"""
import fitz
from pathlib import Path
import sys

original = Path("sample_files/test_corpus/test_pdf.pdf")
translated = Path("sample_files/test_corpus/test_pdf_translated.pdf")

print(f"Original:   {original.stat().st_size:>10} bytes")
print(f"Translated: {translated.stat().st_size:>10} bytes")
print(f"Size diff:  {translated.stat().st_size - original.stat().st_size:>10} bytes ({100 * translated.stat().st_size / original.stat().st_size:.1f}%)")
print()

doc_orig = fitz.open(str(original))
doc_trans = fitz.open(str(translated))

print("=" * 70)
print("PAGE COUNT")
print("=" * 70)
print(f"  Original:   {len(doc_orig)} pages")
print(f"  Translated: {len(doc_trans)} pages")
print()

print("=" * 70)
print("PER-PAGE COMPARISON")
print("=" * 70)
for i in range(max(len(doc_orig), len(doc_trans))):
    o_page = doc_orig[i] if i < len(doc_orig) else None
    t_page = doc_trans[i] if i < len(doc_trans) else None
    print(f"\n--- Page {i+1} ---")
    if o_page:
        o_text = len(o_page.get_text())
        o_links = len(o_page.get_links())
        o_images = len(o_page.get_images())
        o_drawings = len(o_page.get_drawings())
        print(f"  Original:   {o_text:>4} chars, {o_links:>2} links, {o_images:>2} images, {o_drawings:>3} drawings")
    if t_page:
        t_text = len(t_page.get_text())
        t_links = len(t_page.get_links())
        t_images = len(t_page.get_images())
        t_drawings = len(t_page.get_drawings())
        print(f"  Translated: {t_text:>4} chars, {t_links:>2} links, {t_images:>2} images, {t_drawings:>3} drawings")
    if o_page and t_page:
        print(f"  DIFF:       text {t_text - o_text:+d}, links {t_links - o_links:+d}, images {t_images - o_images:+d}, drawings {t_drawings - o_drawings:+d}")

print()
print("=" * 70)
print("HYPERLINK COMPARISON")
print("=" * 70)
for i in range(max(len(doc_orig), len(doc_trans))):
    o_page = doc_orig[i] if i < len(doc_orig) else None
    t_page = doc_trans[i] if i < len(doc_trans) else None
    o_links = o_page.get_links() if o_page else []
    t_links = t_page.get_links() if t_page else []
    if o_links or t_links:
        print(f"\n  Page {i+1}:")
        print(f"    Original has {len(o_links)} links:")
        for link in o_links:
            kind = "URI" if link.get("uri") else "GOTO" if link.get("page") is not None else "?"
            uri_or_page = link.get("uri") or f"page {link.get('page')}"
            print(f"      - {kind}: {uri_or_page[:80]}")
        print(f"    Translated has {len(t_links)} links:")
        for link in t_links:
            kind = "URI" if link.get("uri") else "GOTO" if link.get("page") is not None else "?"
            uri_or_page = link.get("uri") or f"page {link.get('page')}"
            print(f"      - {kind}: {uri_or_page[:80]}")

print()
print("=" * 70)
print("IMAGE COMPARISON")
print("=" * 70)
total_o_imgs = sum(len(p.get_images()) for p in doc_orig)
total_t_imgs = sum(len(p.get_images()) for p in doc_trans)
print(f"  Original:   {total_o_imgs} images")
print(f"  Translated: {total_t_imgs} images")
if total_o_imgs > 0 and total_t_imgs == 0:
    print("  ❌ ALL IMAGES LOST in translation!")

print()
print("=" * 70)
print("DRAWING COMPARISON (rects, lines, etc.)")
print("=" * 70)
total_o_dr = sum(len(p.get_drawings()) for p in doc_orig)
total_t_dr = sum(len(p.get_drawings()) for p in doc_trans)
print(f"  Original:   {total_o_dr} drawings")
print(f"  Translated: {total_t_dr} drawings")

print()
print("=" * 70)
print("SAMPLE TEXT — Page 1 of translated")
print("=" * 70)
if len(doc_trans) > 0:
    print(doc_trans[0].get_text()[:500])

print()
print("=" * 70)
print("SAMPLE TEXT — Page 1 of original")
print("=" * 70)
if len(doc_orig) > 0:
    print(doc_orig[0].get_text()[:500])

doc_orig.close()
doc_trans.close()