from __future__ import annotations

import os
from dataclasses import dataclass
from enum import Enum
from pathlib import Path
from typing import Tuple


class _StrEnumMixin(str, Enum):
    """Behaves like StrEnum on Python < 3.11."""


class Direction(_StrEnumMixin):
    RX = "rx"
    TX = "tx"
    INFO = "info"


class Mode(_StrEnumMixin):
    NORMAL = "normal"
    DOWNLOAD = "download"
    RESET = "reset"


CHECKBOX_STYLE = (
    "QCheckBox::indicator {"
    " width: 14px; height: 14px; border: 1px solid #666; border-radius: 2px; background: #ffffff;"
    "}"
    "QCheckBox::indicator:checked {"
    " background: #1b5e20; border: 1px solid #1b5e20;"
    "}"
)

APP_NAME = "Ameba Control Panel"
APP_VERSION = "3.1.0"
UI_LOG_TAIL_LINES = 100_000
LOG_FLUSH_INTERVAL_MS = 30
LOG_ARCHIVE_MAX = 500_000
LOG_FLUSH_BATCH_LIMIT = 200
PARTIAL_LINE_HOLD_SEC = 0.3
PERF_UPDATE_INTERVAL_MS = 1_000
PORT_REFRESH_INTERVAL_MS = 5_000
DEFAULT_BAUD = 1_500_000
COMMON_BAUD_RATES = [
    115_200,
    230_400,
    460_800,
    921_600,
    1_000_000,
    DEFAULT_BAUD,
    2_000_000,
    3_000_000,
]

TIMESTAMP_FMT = "%Y-%m-%d %H:%M:%S.%f"


@dataclass
class DeviceProfile:
    key: str
    label: str
    rx_color: str = "#1a8a3d"
    tx_color: str = "#2944a8"
    info_color: str = "#7970a9"


DEFAULT_PROFILE = DeviceProfile("dut_1", "DUT 1")


def parse_baud(text: str) -> int:
    try:
        return int(text)
    except (ValueError, TypeError):
        return DEFAULT_BAUD


def app_data_dir() -> Path:
    base = os.environ.get("LOCALAPPDATA")
    if base:
        return Path(base) / "AmebaControlPanel"
    # Fallback for non-Windows dev environments.
    return Path.home() / ".local" / "share" / "AmebaControlPanel"