#!/usr/bin/env python3
"""
Generate PR comment for CLASS.TXT.json duplicate title violations.

This script reads violations.json (created by class-txt-check.py) and generates
a formatted markdown comment to be posted on the PR. The comment includes:
  - File path where violations were found
  - Parent document title and code
  - The duplicate title
  - Document codes that share the duplicate title

Usage:
  Run after class-txt-check.py fails. Reads violations.json and outputs JSON
  with 'body' field containing the markdown comment text.
"""

import json
import sys


def main():
    try:
        with open("violations.json", "r") as f:
            violations = json.load(f)
    except Exception:
        violations = []

    if not violations:
        print(json.dumps({"body": "No violations to report"}))
        sys.exit(0)

    # Group violations by file
    by_file = {}
    for v in violations:
        key = v["file"]
        if key not in by_file:
            by_file[key] = []
        by_file[key].append(v)

    # Build message
    lines = [
        "❌ **Duplicate title detected in CLASS.TXT.json**",
        "",
        "Found child documents with duplicate titles under the same parent:",
        "",
    ]

    for filepath, file_violations in by_file.items():
        lines.append(f"**{filepath}:**")
        for v in file_violations:
            parent_code = v["parent_code"]
            parent_title = v["parent_title"]
            duplicate_title = v["duplicate_title"]
            codes = v["codes"]

            lines.append(f"   - Parent: `{parent_title}` (code: `{parent_code}`)")
            lines.append(f"     Duplicate title: `{duplicate_title}`")
            for code in codes:
                lines.append(f"       - Document code: `{code}`")
        lines.append("")

    lines.append(
        "**Please ensure all child documents under the same parent have unique titles.**"
    )

    message = "\n".join(lines)
    print(json.dumps({"body": message}))


if __name__ == "__main__":
    main()