"""UCD SolidColor 码值刻度（与 UniTAP ``SolidColorParams`` 一致，0–65535）。"""
from __future__ import annotations

SOLID_COLOR_MIN = 0
SOLID_COLOR_MAX = 65535
# 官方 work_with_solid_color.py：65535 刻度需 bpc>=10
SOLID_COLOR_MIN_BPC = 10

# Limited Range 在 SolidColor 刻度下的端点（等价于 8bit 的 16 / 235）
_LIMITED_8BIT_BLACK = 16
_LIMITED_8BIT_WHITE = 235
LIMITED_SOLID_COLOR_BLACK = round(_LIMITED_8BIT_BLACK / 255 * SOLID_COLOR_MAX)
LIMITED_SOLID_COLOR_WHITE = round(_LIMITED_8BIT_WHITE / 255 * SOLID_COLOR_MAX)


def clamp_solid_color(value: int | float) -> int:
    """将码值限制在 SolidColor 合法范围内。"""
    return max(SOLID_COLOR_MIN, min(SOLID_COLOR_MAX, int(round(value))))


def pct_to_solid_color(pct: float) -> int:
    """灰阶/亮度百分比 (0–100) → SolidColor 码值。"""
    pct = max(0.0, min(100.0, float(pct)))
    return int(round(pct / 100.0 * SOLID_COLOR_MAX))


def solid_color_to_pct(value: int | float) -> float:
    """SolidColor 码值 → 百分比 (0–100)。"""
    if SOLID_COLOR_MAX <= 0:
        return 0.0
    return clamp_solid_color(value) / SOLID_COLOR_MAX * 100.0


def solid_color_to_byte(value: int | float) -> int:
    """SolidColor 码值 → 8bit（UI 色块 / HEX 显示用）。"""
    return int(round(clamp_solid_color(value) / SOLID_COLOR_MAX * 255))


def byte_to_solid_color(value: int | float) -> int:
    """旧 8bit 码值 (0–255) → SolidColor 刻度。"""
    byte = max(0, min(255, int(round(value))))
    return int(round(byte / 255.0 * SOLID_COLOR_MAX))


def solid_color_rgb(r: int, g: int, b: int) -> list[int]:
    """将旧 8bit RGB 三元组转为 SolidColor 刻度。"""
    return [byte_to_solid_color(r), byte_to_solid_color(g), byte_to_solid_color(b)]


def is_legacy_8bit_pattern_params(params: list) -> bool:
    """判断 ``pattern_params`` 是否仍为旧 0–255 刻度。"""
    if not params:
        return False
    max_val = 0
    for row in params:
        if not row:
            continue
        for channel in row[:3]:
            try:
                max_val = max(max_val, int(channel))
            except (TypeError, ValueError):
                pass
    return max_val <= 255


def migrate_pattern_params(params: list) -> list:
    """将 0–255 刻度的 pattern 参数迁移到 SolidColor 刻度。"""
    if not is_legacy_8bit_pattern_params(params):
        return params
    migrated: list = []
    for row in params:
        head = [byte_to_solid_color(v) for v in row[:3]]
        migrated.append(head + list(row[3:]))
    return migrated


def ensure_solid_color_pattern(pattern: dict) -> dict:
    """确保 pattern 字典中的 ``pattern_params`` 使用 SolidColor 刻度。"""
    params = pattern.get("pattern_params")
    if params:
        pattern["pattern_params"] = migrate_pattern_params(params)
    return pattern


def pack_solid_color_hw_registers(
    rgb: tuple[int, int, int] | list[int],
) -> tuple[int, int]:
    """将 65535 刻度 RGB 打包为 PG 硬件寄存器值（``shifter=0``，新版 UCD API）。

    旧版 UniTAP SDK 在 ``set_pattern_params`` 内还会按 ``16-bpc`` 左移；
    65535 刻度下左移会导致 32 位溢出（30%/50%/80% 灰阶发暗）。
    新版 UCD 直接接受 0–65535，须绕过 SDK 移位。
    """
    r = clamp_solid_color(rgb[0])
    g = clamp_solid_color(rgb[1])
    b = clamp_solid_color(rgb[2])
    param0 = ((r << 16) | g) & 0xFFFFFFFF
    param1 = b & 0xFFFFFFFF
    return param0, param1


__all__ = [
    "SOLID_COLOR_MIN",
    "SOLID_COLOR_MAX",
    "SOLID_COLOR_MIN_BPC",
    "LIMITED_SOLID_COLOR_BLACK",
    "LIMITED_SOLID_COLOR_WHITE",
    "clamp_solid_color",
    "pct_to_solid_color",
    "solid_color_to_pct",
    "solid_color_to_byte",
    "byte_to_solid_color",
    "solid_color_rgb",
    "is_legacy_8bit_pattern_params",
    "migrate_pattern_params",
    "ensure_solid_color_pattern",
    "pack_solid_color_hw_registers",
]