import logging
import re

from PyQt6.QtGui import QBrush, QColor

from highlight import Highlight
from highlight_regex import HighlightRegex
from settings import Settings

log = logging.getLogger("highlighting")


class Highlighting:

    @staticmethod
    def read_config(settings: Settings) -> [Highlight]:
        result = []
        config = settings.config

        for section in config.sections():
            if not section.startswith("highlighting."):
                continue

            query = config.get(section, "query", fallback="")
            if len(query) == 0:
                continue
            ignore_case = config.getboolean(section, "ignore-case", fallback=True)
            is_regex = config.getboolean(section, "is-regex", fallback=False)
            line_background_color = Highlighting.brush(config.get(section, "line.background.color", fallback="None"))
            hit_background_color = Highlighting.brush(config.get(section, "hit.background.color", fallback="None"))
            try:
                flags = re.IGNORECASE if ignore_case else 0
                if is_regex:
                    regex = re.compile(query, flags=flags)
                else:
                    regex = re.compile(re.escape(query), flags=flags)
            except:
                log.exception("failed to parse query for highlighter: %s" % section)
                continue

            highlight = HighlightRegex(
                regex=regex,
                brush=hit_background_color,
                brush_full_line=line_background_color
            )
            result.append(highlight)

        return result

    @staticmethod
    def brush(color: str) -> QBrush:
        if re.match("[0-9a-f]{6}", color, flags=re.IGNORECASE):
            red = int(color[0:2], 16)
            green = int(color[2:4], 16)
            blue = int(color[4:6], 16)
            return QBrush(QColor(red, green, blue))
        return QBrush()