#!/usr/bin/env python3
# remove-form v1.4 — Remove form from 1C object
# Source: https://github.com/Nikolay-Shirokov/cc-1c-skills

import argparse
import os
import re
import shutil
import sys

from lxml import etree

NSMAP = {"md": "http://v8.1c.ru/8.3/MDClasses"}


def _detect_xml_style(path):
    """Стиль существующего файла для round-trip-сохранения: BOM / EOL / регистр encoding /
    финальный перенос. None → файл новый (сохранить текущее поведение)."""
    try:
        raw = open(path, "rb").read()
    except OSError:
        return None
    bom = raw.startswith(b"\xef\xbb\xbf")
    body = raw[3:] if bom else raw
    crlf = b"\r\n" in body
    m = re.search(rb'encoding="([^"]+)"', body[:200])
    enc = m.group(1).decode("ascii") if m else "utf-8"
    final_nl = body.endswith(b"\n")
    return {"bom": bom, "crlf": crlf, "enc": enc, "final_nl": final_nl}


def _finalize_xml_bytes(xml_bytes, style):
    """Привести сериализованные байты к стилю оригинала (или к дефолту, если style is None)."""
    enc_decl = style["enc"] if style else "utf-8"
    xml_bytes = xml_bytes.replace(
        b"<?xml version='1.0' encoding='UTF-8'?>",
        b'<?xml version="1.0" encoding="' + enc_decl.encode("ascii") + b'"?>')
    # Канонизировать переносы к LF (убирает &#13; от \r в tail'ах)
    xml_bytes = (xml_bytes.replace(b"&#13;\n", b"\n").replace(b"&#13;", b"")
                 .replace(b"\r\n", b"\n").replace(b"\r", b"\n"))
    # Финальный перенос — как в оригинале (новый файл → есть)
    want_final_nl = style["final_nl"] if style else True
    xml_bytes = xml_bytes.rstrip(b"\n")
    if want_final_nl:
        xml_bytes += b"\n"
    # EOL — как в оригинале (новый файл → LF, текущее поведение)
    if style and style["crlf"]:
        xml_bytes = xml_bytes.replace(b"\n", b"\r\n")
    return xml_bytes


def save_xml_with_bom(tree, path):
    """Save XML tree preserving the existing file's BOM/EOL/encoding-case/final-newline."""
    style = _detect_xml_style(path)
    xml_bytes = etree.tostring(tree, xml_declaration=True, encoding="UTF-8")
    xml_bytes = _finalize_xml_bytes(xml_bytes, style)
    with open(path, "wb") as f:
        if style is None or style["bom"]:
            f.write(b"\xef\xbb\xbf")
        f.write(xml_bytes)


def main():
    sys.stdout.reconfigure(encoding="utf-8")
    sys.stderr.reconfigure(encoding="utf-8")
    parser = argparse.ArgumentParser(description="Remove form from 1C object", allow_abbrev=False)
    parser.add_argument("-ObjectName", "-ProcessorName", required=True)
    parser.add_argument("-FormName", required=True)
    parser.add_argument("-SrcDir", default="src")
    args = parser.parse_args()

    object_name = args.ObjectName
    form_name = args.FormName
    src_dir = args.SrcDir

    # --- Checks ---

    root_xml_path = os.path.join(src_dir, f"{object_name}.xml")
    if not os.path.exists(root_xml_path):
        print(f"Корневой файл обработки не найден: {root_xml_path}", file=sys.stderr)
        sys.exit(1)

    processor_dir = os.path.join(src_dir, object_name)
    forms_dir = os.path.join(processor_dir, "Forms")
    form_meta_path = os.path.join(forms_dir, f"{form_name}.xml")
    form_dir = os.path.join(forms_dir, form_name)

    if not os.path.exists(form_meta_path):
        print(f"Метаданные формы не найдены: {form_meta_path}", file=sys.stderr)
        sys.exit(1)

    # --- Delete files ---

    if os.path.isdir(form_dir):
        shutil.rmtree(form_dir)
        print(f"[OK] Удалён каталог: {form_dir}")

    os.remove(form_meta_path)
    print(f"[OK] Удалён файл: {form_meta_path}")

    # --- Modify root XML ---

    root_xml_full = os.path.abspath(root_xml_path)
    parser_xml = etree.XMLParser(remove_blank_text=False)
    tree = etree.parse(root_xml_full, parser_xml)
    root = tree.getroot()

    # Remove <Form>FormName</Form> from ChildObjects
    for node in root.findall(".//md:ChildObjects/md:Form", NSMAP):
        if node.text and node.text.strip() == form_name:
            parent = node.getparent()
            prev = node.getprevious()
            if prev is not None:
                # Whitespace is in prev.tail
                if prev.tail and prev.tail.strip() == "":
                    prev.tail = ""
            else:
                # First child — whitespace is in parent.text
                if parent.text and parent.text.strip() == "":
                    parent.text = ""
            parent.remove(node)
            break

    # Clear any Default*/Auxiliary* form slot that pointed to the removed form
    # (form-add writes the purpose-specific property: DefaultObjectForm / DefaultListForm /
    #  DefaultChoiceForm / DefaultRecordForm / DefaultForm — not just generic DefaultForm).
    ref_re = re.compile(rf"Form\.{re.escape(form_name)}$")
    for el in root.iter():
        if not isinstance(el.tag, str):
            continue
        if etree.QName(el).localname.endswith("Form") and el.text and ref_re.search(el.text):
            el.text = ""

    # Save with BOM
    save_xml_with_bom(tree, root_xml_full)

    print(f"[OK] Форма {form_name} удалена из {root_xml_path}")


if __name__ == "__main__":
    main()