from __future__ import annotations

PREVIEW_MODE_TILE = "tile"
PREVIEW_MODE_TECHNICAL = "technical"
PREVIEW_MODE_LEDS = "leds"
PREVIEW_MODES = (PREVIEW_MODE_TILE, PREVIEW_MODE_TECHNICAL, PREVIEW_MODE_LEDS)


def normalize_preview_mode(mode: str | None) -> str:
    normalized = str(mode or PREVIEW_MODE_TILE).strip().lower()
    return normalized if normalized in PREVIEW_MODES else PREVIEW_MODE_TILE


def preview_mode_flags(mode: str) -> dict[str, bool]:
    preview_mode = normalize_preview_mode(mode)
    return {
        "show_fill": preview_mode in {PREVIEW_MODE_TILE, PREVIEW_MODE_TECHNICAL},
        "show_labels": preview_mode in {PREVIEW_MODE_TILE, PREVIEW_MODE_TECHNICAL},
        "show_leds": preview_mode in {PREVIEW_MODE_TECHNICAL, PREVIEW_MODE_LEDS},
        "show_guides": preview_mode == PREVIEW_MODE_TECHNICAL,
        "show_direction": preview_mode == PREVIEW_MODE_TECHNICAL,
        "show_overlay_title": preview_mode == PREVIEW_MODE_TECHNICAL,
        "show_technical_meta": preview_mode == PREVIEW_MODE_TECHNICAL,
    }