"""
Incomplete implementation of the style guide.
"""
import logging
import re
import unicodedata

import pytest

LOG = logging.getLogger(__name__)


def test_starts_with_upper(lines):
    failures = []
    for line, line_number, file in lines:
        word_chars = re.findall(r"\w", line)
        if word_chars and word_chars[0] != word_chars[0].upper():
            failures.append(
                f"{file}:{line_number}: Lower case letter at the beginning of the line.\n{line}\n^"
            )
    if failures:
        pytest.fail("\n".join(failures))


def test_multiple_empty_lines(lines):
    failures = []
    last_line_empty = False
    for line, line_number, file in lines:
        if not line and last_line_empty:
            failures.append(
                f"{file}:{line_number-1}-{line_number}: Multiple empty lines."
            )
        last_line_empty = not line
    if failures:
        pytest.fail("\n".join(failures))


@pytest.mark.parametrize(
    "heading", ["hook", "verse", "refrain", "ref.", "chorus", "coro"]
)
def test_section_headings(lines, heading):
    for line, line_number, file in lines:
        if line:
            if heading in line.lower():
                LOG.warning(
                    f"{file}:{line_number}: Suspect heading \"{heading}\".\n{line}\n{'': <{line.lower().index(heading)}}^"
                )


@pytest.mark.parametrize("punctuation", ",.")
def test_line_ends_with_forbidden_punctuation(lines, punctuation):
    failures = []
    for line, line_number, file in lines:
        if line:
            if line[-1] == punctuation:
                failures.append(
                    f"{file}:{line_number}: \"{punctuation}\" at EOL.\n{line}\n{'': <{len(line)-1}}^"
                )
    if failures:
        pytest.fail("\n".join(failures))


@pytest.mark.parametrize("exaggeration", ["!!", "??", "ohh", "ahh", ".."])
def test_line_contains_exaggerations(lines, exaggeration):
    failures = []
    for line, line_number, file in lines:
        if line:
            if exaggeration in line:
                failures.append(
                    f"{file}:{line_number}: Forbidden exaggeration: \"{exaggeration}\".\n{line}\n{'': <{line.index(exaggeration)}}^"
                )
    if failures:
        pytest.fail("\n".join(failures))


_ALLOWED_CHAR_CATEGORIES = "LNPZ"


def test_allowed_character_categories(lines):
    failures = []
    for line, line_number, file in lines:
        for char in line:
            if unicodedata.category(char)[0] not in _ALLOWED_CHAR_CATEGORIES:
                failures.append(
                    f"{file}:{line_number}: Forbidden character: {repr(char)} (category {unicodedata.category(char)}).\n{line}\n{'': <{line.index(char)}}^"
                )
    if failures:
        pytest.fail("\n".join(failures))


_ALLOWED_WHITESPACE = " \n"


def test_allowed_whitespace(lines):
    failures = []
    for line, line_number, file in lines:
        for char in line:
            if unicodedata.category(char)[0] == "Z" and char not in _ALLOWED_WHITESPACE:
                failures.append(
                    f"{file}:{line_number}: Forbidden whitespace: {repr(char)}.\n{line}\n{'': <{line.index(char)}}^"
                )
    if failures:
        pytest.fail("\n".join(failures))


_ALLOWED_PUNCTUATION = ".,¿?¡!'\"«»()-*"


def test_allowed_punctuation(lines):
    failures = []
    for line, line_number, file in lines:
        for char in line:
            if (
                unicodedata.category(char)[0] == "P"
                and char not in _ALLOWED_PUNCTUATION
            ):
                failures.append(
                    f"{file}:{line_number}: Forbidden punctuation: {repr(char)}.\n{line}\n{'': <{line.index(char)}}^"
                )
    if failures:
        pytest.fail("\n".join(failures))


def test_first_or_last_line_is_empty(lines):
    failures = []
    last_line = ("", 1000, None)
    line = ""
    file = None
    line_number = 0
    for line, line_number, file in lines:
        if line_number == 1:
            if len(line.strip()) == 0:
                failures.append(f"{file}:{line_number}: First line is empty.")
        if last_line[1] > line_number and last_line[2] is not None:
            if len(last_line[0].strip()) == 0:
                failures.append(f"{last_line[2]}:{last_line[1]}: Last line is empty.")
        last_line = (line, line_number, file)

    # very last line
    if line_number != 0 and len(line.strip()) == 0:
        failures.append(f"{file}:{line_number}: Last line is empty.")

    if failures:
        pytest.fail("\n".join(failures))


def test_lines_contains_unnecessary_whitespace(lines):
    failures = []
    for line, line_number, file in lines:
        if line:
            if line.rstrip() != line:
                failures.append(
                    f'{file}:{line_number}: Trailing whitespace.\n"{line}" <--'
                )
            if line.lstrip() != line:
                failures.append(
                    f'{file}:{line_number}: Leading whitespace.\n--> "{line}"'
                )

    if failures:
        pytest.fail("\n".join(failures))


def test_unicode_nfkc(lines):
    failures = []
    for line, line_number, file in lines:
        if line:
            if line != unicodedata.normalize("NFKC", line):
                failures.append(f"{file}:{line_number}: Not in NFKC form.")

    if failures:
        pytest.fail("\n".join(failures))