import os
from lxml import etree

NAMESPACE = {'kgpz': 'https://www.koenigsberger-zeitungen.de'}
SCRIPT_DIR = os.path.dirname(os.path.abspath(__file__))
XML_DIR = os.path.abspath(os.path.join(SCRIPT_DIR, '..', 'XML'))

def parse_xml_file(filepath):
    try:
        parser = etree.XMLParser(remove_blank_text=True)
        tree = etree.parse(filepath, parser)
        return tree.getroot()
    except etree.ParseError as e:
        print(f"Error parsing {filepath}: {e}")
        return None

def get_all_ids(root, tag):
    return set(elem.get('id') for elem in root.xpath(f'.//kgpz:{tag}', namespaces=NAMESPACE))

def check_references(beitrag_root, reference_data, filename):
    errors = []
    for ref_type, ref_tag in [('akteur', 'akteur'), ('kategorie', 'kategorie'), 
                              ('ort', 'ort'), ('werk', 'werk')]:
        for ref in beitrag_root.xpath(f'//kgpz:{ref_tag}', namespaces=NAMESPACE):
            ref_id = ref.get('ref')
            if ref_id not in reference_data[ref_type]:
                line_number = ref.sourceline
                errors.append((filename, line_number, f"INVALID REFERENCE ({ref_type}:{ref_id})"))
    return errors

def main():
    reference_data = {
        'akteur': get_all_ids(parse_xml_file(os.path.join(XML_DIR, 'akteure.xml')), 'akteur'),
        'kategorie': get_all_ids(parse_xml_file(os.path.join(XML_DIR, 'kategorien.xml')), 'kategorie'),
        'ort': get_all_ids(parse_xml_file(os.path.join(XML_DIR, 'orte.xml')), 'ort'),
        'werk': get_all_ids(parse_xml_file(os.path.join(XML_DIR, 'werke.xml')), 'werk'),
    }

    all_errors = []

    beitraege_dir = os.path.join(XML_DIR, 'beitraege')
    for filename in os.listdir(beitraege_dir):
        if filename.endswith('-beitraege.xml'):
            beitrag_root = parse_xml_file(os.path.join(beitraege_dir, filename))
            if beitrag_root is not None:
                errors = check_references(beitrag_root, reference_data, filename)
                all_errors.extend(errors)

    all_errors.sort(key=lambda x: (x[0], x[1]))

    with open('linter_results.txt', 'w') as f:
        for filename, line_number, error_message in all_errors:
            f.write(f"{filename}:{line_number}:{error_message}\n")

    if all_errors:
        for filename, line_number, error_message in all_errors:
            print(f"{filename}, Line {line_number}: {error_message}")
        exit(1)  # Exit with error code if there are any errors
    else:
        print("No errors found.")

if __name__ == "__main__":
    main()