# All comments are in English.

import openpyxl
import xlrd
from odf.opendocument import load
from odf.table import Table, TableRow, TableCell
from odf.text import P

def normalize_newlines(value):
    if value is None:
        return ""
    return (
        str(value)
        .replace("\r\n", "\\n")
        .replace("\n\r", "\\n")
        .replace("\r", "\\n")
        .replace("\n", "\\n")
    )

def convert_xlsx(path):
    wb = openpyxl.load_workbook(path, data_only=True)
    ws = wb.active
    rows = []
    for row in ws.iter_rows(values_only=True):
        cleaned = [normalize_newlines(cell) for cell in row]
        rows.append("\x09".join(cleaned))
    return "\n".join(rows)

def convert_xls(path):
    wb = xlrd.open_workbook(path)
    sheet = wb.sheet_by_index(0)
    rows = []
    for r in range(sheet.nrows):
        cleaned = [normalize_newlines(sheet.cell_value(r, c)) for c in range(sheet.ncols)]
        rows.append("\x09".join(cleaned))
    return "\n".join(rows)

def convert_ods(path):
    doc = load(path)
    rows = []
    for table in doc.getElementsByType(Table):
        for row in table.getElementsByType(TableRow):
            cells = []
            for cell in row.getElementsByType(TableCell):
                text = "".join(t.data for t in cell.getElementsByType(P))
                cells.append(normalize_newlines(text))
            rows.append("\x09".join(cells))
    return "\n".join(rows)

def convert_excel(path):
    if path.endswith(".xlsx"):
        return convert_xlsx(path)
    if path.endswith(".xls"):
        return convert_xls(path)
    if path.endswith(".ods"):
        return convert_ods(path)
    raise ValueError("Unsupported Excel format")

def convert_xlsx_all_sheets(path):
    wb = openpyxl.load_workbook(path, data_only=True)
    results = {}
    for sheet_name in wb.sheetnames:
        ws = wb[sheet_name]
        rows = []
        for row in ws.iter_rows(values_only=True):
            cleaned = [normalize_newlines(cell) for cell in row]
            rows.append("\x09".join(cleaned))
        results[sheet_name] = "\n".join(rows)
    return results

def convert_xls_all_sheets(path):
    wb = xlrd.open_workbook(path)
    results = {}
    for sheet in wb.sheets():
        rows = []
        for r in range(sheet.nrows):
            cleaned = [
                normalize_newlines(sheet.cell_value(r, c))
                for c in range(sheet.ncols)
            ]
            rows.append("\x09".join(cleaned))
        results[sheet.name] = "\n".join(rows)
    return results

def convert_ods_all_sheets(path):
    doc = load(path)
    results = {}
    for table in doc.getElementsByType(Table):
        sheet_name = table.getAttribute("name") or "Sheet"
        rows = []
        for row in table.getElementsByType(TableRow):
            cells = []
            for cell in row.getElementsByType(TableCell):
                text = "".join(t.data for t in cell.getElementsByType(P))
                cells.append(normalize_newlines(text))
            rows.append("\x09".join(cells))
        results[sheet_name] = "\n".join(rows)
    return results

def convert_excel_all_sheets(path):
    if path.endswith(".xlsx"):
        return convert_xlsx_all_sheets(path)
    if path.endswith(".xls"):
        return convert_xls_all_sheets(path)
    if path.endswith(".ods"):
        return convert_ods_all_sheets(path)
    raise ValueError("Unsupported Excel format")