"""Logging helpers for the finger dashboard."""

from __future__ import annotations

from PyQt5.QtGui import QFont
from PyQt5.QtWidgets import QPlainTextEdit


class TeeStream:
    """Write to multiple text streams."""

    def __init__(self, *streams):
        self.streams = streams

    def write(self, text):
        for stream in self.streams:
            stream.write(text)

    def flush(self):
        for stream in self.streams:
            stream.flush()


class WidgetLogHandler:
    """Mirror print output into a QPlainTextEdit."""

    def __init__(self, widget: QPlainTextEdit):
        self.widget = widget
        self.buf = ""

    def write(self, text: str):
        self.buf += text
        while "\n" in self.buf:
            line, self.buf = self.buf.split("\n", 1)
            if line:
                self.widget.appendPlainText(line)

    def flush(self):
        if self.buf:
            self.widget.appendPlainText(self.buf)
            self.buf = ""


def make_log_widget() -> QPlainTextEdit:
    widget = QPlainTextEdit()
    widget.setReadOnly(True)
    widget.setMaximumBlockCount(2000)
    font = QFont("Consolas", 12)
    font.setStyleHint(QFont.Monospace)
    widget.setFont(font)
    return widget