skills/pptx/scripts/office/validators/redlining.py

"""
Validator for tracked changes in Word documents.
"""

import subprocess
import tempfile
import zipfile
from pathlib import Path


class RedliningValidator:
    def __init__(self, unpacked_dir, original_docx, verbose=False, author="Claude"):
        self.unpacked_dir = Path(unpacked_dir)
        self.original_docx = Path(original_docx)
        self.verbose = verbose
        self.author = author
        self.namespaces = {"w": "http://schemas.openxmlformats.org/wordprocessingml/2006/main"}

    def repair(self) -> int:
        return 0

    def validate(self):
        modified_file = self.unpacked_dir / "word" / "document.xml"
        if not modified_file.exists():
            print(f"FAILED - Modified document.xml not found at {modified_file}")
            return False

        try:
            import xml.etree.ElementTree as ET

            tree = ET.parse(modified_file)
            root = tree.getroot()

            del_elements = root.findall(".//w:del", self.namespaces)
            ins_elements = root.findall(".//w:ins", self.namespaces)

            author_del_elements = [
                elem
                for elem in del_elements
                if elem.get(f"{{{self.namespaces['w']}}}author") == self.author
            ]
            author_ins_elements = [
                elem
                for elem in ins_elements
                if elem.get(f"{{{self.namespaces['w']}}}author") == self.author
            ]

            if not author_del_elements and not author_ins_elements:
                if self.verbose:
                    print(f"PASSED - No tracked changes by {self.author} found.")
                return True

        except Exception:
            pass

        with tempfile.TemporaryDirectory() as temp_dir:
            temp_path = Path(temp_dir)

            try:
                with zipfile.ZipFile(self.original_docx, "r") as zip_ref:
                    zip_ref.extractall(temp_path)
            except Exception as e:
                print(f"FAILED - Error unpacking original docx: {e}")
                return False

            original_file = temp_path / "word" / "document.xml"
            if not original_file.exists():
                print(f"FAILED - Original document.xml not found in {self.original_docx}")
                return False

            try:
                import xml.etree.ElementTree as ET

                modified_tree = ET.parse(modified_file)
                modified_root = modified_tree.getroot()
                original_tree = ET.parse(original_file)
                original_root = original_tree.getroot()
            except ET.ParseError as e:
                print(f"FAILED - Error parsing XML files: {e}")
                return False

            self._remove_author_tracked_changes(original_root)
            self._remove_author_tracked_changes(modified_root)

            modified_text = self._extract_text_content(modified_root)
            original_text = self._extract_text_content(original_root)

            if modified_text != original_text:
                error_message = self._generate_detailed_diff(original_text, modified_text)
                print(error_message)
                return False

            if self.verbose:
                print(f"PASSED - All changes by {self.author} are properly tracked")
            return True

    def _generate_detailed_diff(self, original_text, modified_text):
        error_parts = [
            f"FAILED - Document text doesn't match after removing {self.author}'s tracked changes",
            "",
            "Likely causes:",
            "  1. Modified text inside another author's <w:ins> or <w:del> tags",
            "  2. Made edits without proper tracked changes",
            "  3. Didn't nest <w:del> inside <w:ins> when deleting another's insertion",
            "",
            "For pre-redlined documents, use correct patterns:",
            "  - To reject another's INSERTION: Nest <w:del> inside their <w:ins>",
            "  - To restore another's DELETION: Add new <w:ins> AFTER their <w:del>",
            "",
        ]

        git_diff = self._get_git_word_diff(original_text, modified_text)
        if git_diff:
            error_parts.extend(["Differences:", "============", git_diff])
        else:
            error_parts.append("Unable to generate word diff (git not available)")

        return "\n".join(error_parts)

    def _get_git_word_diff(self, original_text, modified_text):
        try:
            with tempfile.TemporaryDirectory() as temp_dir:
                temp_path = Path(temp_dir)

                original_file = temp_path / "original.txt"
                modified_file = temp_path / "modified.txt"

                original_file.write_text(original_text, encoding="utf-8")
                modified_file.write_text(modified_text, encoding="utf-8")

                result = subprocess.run(
                    [
                        "git",
                        "diff",
                        "--word-diff=plain",
                        "--word-diff-regex=.",
                        "-U0",
                        "--no-index",
                        str(original_file),
                        str(modified_file),
                    ],
                    capture_output=True,
                    text=True,
                )

                if result.stdout.strip():
                    lines = result.stdout.split("\n")
                    content_lines = []
                    in_content = False
                    for line in lines:
                        if line.startswith("@@"):
                            in_content = True
                            continue
                        if in_content and line.strip():
                            content_lines.append(line)

                    if content_li
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