#!/usr/bin/env python3

import argparse

from windowed_file import FileNotOpened, WindowedFile  # type: ignore
from flake8_utils import flake8, format_flake8_output  # type: ignore

_LINT_ERROR_TEMPLATE = """
Your proposed edit has introduced new syntax error(s). Please read this error message carefully and then retry editing the file.

ERRORS:

{errors}
This is how your edit would have looked if applied
------------------------------------------------
{window_applied}
------------------------------------------------

This is the original code before your edit
------------------------------------------------
{window_original}
------------------------------------------------

Your changes have NOT been applied. Please fix your edit command and try again.
DO NOT re-run the same failed edit command. Running it again will lead to the same error.
"""

_SUCCESS_MSG = "Edit successful."


def get_parser() -> argparse.ArgumentParser:
    parser = argparse.ArgumentParser()
    parser.add_argument("replace", type=str)
    return parser


def main(replace: str):
    try:
        wf = WindowedFile(exit_on_exception=False)
    except FileNotOpened:
        print("No file opened. Either `open` a file first.")
        exit(1)

    pre_edit_lint = flake8(wf.path)

    start_line, end_line = wf.line_range
    replace_lines = len(replace.split("\n"))

    wf.set_window_text(replace)
    post_edit_lint = flake8(wf.path)

    replacement_window = (
        start_line,
        end_line,
    )
    new_flake8_output = format_flake8_output(
        post_edit_lint,
        previous_errors_string=pre_edit_lint,
        replacement_window=replacement_window,
        replacement_n_lines=replace_lines,
    )

    if new_flake8_output:
        with_edits = wf.get_window_text(line_numbers=True, status_line=True, pre_post_line=True)
        wf.undo_edit()
        without_edits = wf.get_window_text(line_numbers=True, status_line=True, pre_post_line=True)
        print(
            _LINT_ERROR_TEMPLATE.format(
                errors=new_flake8_output, window_applied=with_edits, window_original=without_edits
            )
        )
        exit(4)

    print(_SUCCESS_MSG)


if __name__ == "__main__":
    main(**vars(get_parser().parse_args()))