"""
Configuration constants, CLI flags, and glyph tables.
"""

import sys
from pathlib import Path

_REPO_ROOT = Path(__file__).resolve().parent.parent
_FONT_EXTENSIONS = {".otf", ".ttf", ".ttc"}


def _arg_value(flag):
    """Get value following a CLI flag, if present."""
    if flag not in sys.argv:
        return None
    i = sys.argv.index(flag)
    return sys.argv[i + 1] if i + 1 < len(sys.argv) else None


def _arg_int(flag, default):
    """Get int CLI argument with safe fallback."""
    raw = _arg_value(flag)
    if raw is None:
        return default
    try:
        return int(raw)
    except ValueError:
        return default


def _resolve_font_path(raw_path):
    """Resolve font path; relative paths are anchored to repo root."""
    p = Path(raw_path).expanduser()
    if p.is_absolute():
        return str(p)
    return str((_REPO_ROOT / p).resolve())


def _list_font_files(font_dir):
    """List supported font files within a font directory."""
    font_root = Path(font_dir)
    if not font_root.exists() or not font_root.is_dir():
        return []
    return [
        str(path.resolve())
        for path in sorted(font_root.iterdir())
        if path.is_file() and path.suffix.lower() in _FONT_EXTENSIONS
    ]


def list_repo_font_files():
    """Public helper for discovering repository font files."""
    return _list_font_files(FONT_DIR)


# ─── RUNTIME ──────────────────────────────────────────────
HEADLINE_LIMIT = 1000
FEED_TIMEOUT = 10
MIC_THRESHOLD_DB = 50  # dB above which glitches intensify
MODE = (
    "poetry" if "--poetry" in sys.argv or "-p" in sys.argv
    else "code" if "--code" in sys.argv
    else "news"
)
FIREHOSE = "--firehose" in sys.argv

# ─── NTFY MESSAGE QUEUE ──────────────────────────────────
NTFY_TOPIC = "https://ntfy.sh/klubhaus_terminal_mainline/json"
NTFY_RECONNECT_DELAY = 5  # seconds before reconnecting after a dropped stream
MESSAGE_DISPLAY_SECS = 30  # how long a message holds the screen

# ─── FONT RENDERING ──────────────────────────────────────
FONT_DIR = _resolve_font_path(_arg_value("--font-dir") or "fonts")
_FONT_FILE_ARG = _arg_value("--font-file")
_FONT_FILES = _list_font_files(FONT_DIR)
FONT_PATH = (
    _resolve_font_path(_FONT_FILE_ARG)
    if _FONT_FILE_ARG
    else (_FONT_FILES[0] if _FONT_FILES else "")
)
FONT_INDEX = max(0, _arg_int("--font-index", 0))
FONT_PICKER = "--no-font-picker" not in sys.argv
FONT_SZ = 60
RENDER_H = 8  # terminal rows per rendered text line

# ─── FONT RENDERING (ADVANCED) ────────────────────────────
SSAA = 4  # super-sampling factor: render at SSAA× then downsample

# ─── SCROLL / FRAME ──────────────────────────────────────
SCROLL_DUR = 5.625  # seconds per headline (2/3 original speed)
FRAME_DT = 0.05  # 50ms base frame rate (20 FPS)
FIREHOSE_H = 12  # firehose zone height (terminal rows)
GRAD_SPEED = 0.08  # gradient traversal speed (cycles/sec, ~12s full sweep)

# ─── GLYPHS ───────────────────────────────────────────────
GLITCH = "░▒▓█▌▐╌╍╎╏┃┆┇┊┋"
KATA = "ﾊﾐﾋｰｳｼﾅﾓﾆｻﾜﾂｵﾘｱﾎﾃﾏｹﾒｴｶｷﾑﾕﾗｾﾈｽﾀﾇﾍ"


def set_font_selection(font_path=None, font_index=None):
    """Set runtime primary font selection."""
    global FONT_PATH, FONT_INDEX
    if font_path is not None:
        FONT_PATH = _resolve_font_path(font_path)
    if font_index is not None:
        FONT_INDEX = max(0, int(font_index))


# ─── THEME MANAGEMENT ─────────────────────────────────────────
ACTIVE_THEME = None


def set_active_theme(theme_id: str = "green"):
    """Set the active theme by ID.

    Args:
        theme_id: Theme identifier ("green", "orange", or "purple")
                  Defaults to "green"

    Raises:
        KeyError: If theme_id is not in the theme registry

    Side Effects:
        Sets the ACTIVE_THEME global variable
    """
    global ACTIVE_THEME
    from engine import themes

    ACTIVE_THEME = themes.get_theme(theme_id)