import sys
import os
from xml.etree import ElementTree as ET
import json
from test_set_map import igc_map


def get_xml_paragraphs() -> ET.Element:
    """Return paragraphs from an original IGC XML file, defined by the imported igc_map."""

    igc_file = igc_map[TEST_DATA_FILE]
    igc_xml = os.path.join(IGC_PATH, igc_file + ".xml")

    with open(igc_xml, "r") as f:
        tree = ET.parse(f)
        root = tree.getroot()
        paragraphs = root[1][0][0]

        return paragraphs


def get_correction_map() -> dict:
    """Get the correction map from a json file."""

    with open(os.path.join(os.getcwd(), "Type2", "IGC", TEST_DATA_FILE + "_correction_map.json"), "r") as f:
        correction_map = json.load(f)

    correction_map = {int(k): v for k, v in correction_map.items()}
    return correction_map


def change_text(correction_map, paragraphs) -> str:
    """Make corrections to the original text based on the correction map."""

    corrected_text = []
    for key, value in correction_map.items():
        original_text = paragraphs[key].text
        # Counter for the shift in index positions due to deletions
        total_shift = 0
        for idx, corr in value.items():
            idx = int(idx)
            # Account for any previous deletions in the text
            adjusted_idx = idx + total_shift
            if corr[0] == "del":
                original_text = original_text[:adjusted_idx] + original_text[adjusted_idx + 1 :]
                total_shift -= 1
            elif corr[0] == "add":
                original_text = original_text[:adjusted_idx] + corr[1] + original_text[adjusted_idx:]
        corrected_text.append(original_text)

    return "\n\n".join(corrected_text)


if __name__ == "__main__":
    TEST_DATA_FILE = sys.argv[1]

    IGC_PATH = sys.argv[2]

    correction_map = get_correction_map()
    xml_paragraphs = get_xml_paragraphs()
    corrected_text = change_text(correction_map, xml_paragraphs)
    print(corrected_text)