"""贴纸配置领域模型 — 纯逻辑，无外部依赖.

抽离自 sticker_engine.py 的数据类、常量和纯逻辑函数，
方便单测覆盖，同时保持向后兼容。
"""

from __future__ import annotations

from dataclasses import dataclass, field
from typing import Any

# ── 预设贴纸分类 ──────────────────────────────────────────────────────────────

STICKER_CATEGORIES = [
    ("emoji", "表情包"),
    ("text", "文字花字"),
    ("decoration", "装饰"),
    ("arrow", "箭头指示"),
    ("frame", "边框"),
]

# 9宫格位置映射（归一化坐标 0-1）
POSITION_PRESETS: dict[str, tuple[float, float]] = {
    "top_left": (0.05, 0.05),
    "top_center": (0.5, 0.05),
    "top_right": (0.95, 0.05),
    "center_left": (0.05, 0.5),
    "center": (0.5, 0.5),
    "center_right": (0.95, 0.5),
    "bottom_left": (0.05, 0.95),
    "bottom_center": (0.5, 0.95),
    "bottom_right": (0.95, 0.95),
}


# ── 数据模型 ──────────────────────────────────────────────────────────────────


@dataclass
class ImageStickerConfig:
    """图片贴纸配置."""

    enabled: bool = False
    type: str = "image"
    # 位置
    position: str = "top_right"
    x: float | None = None
    y: float | None = None
    x_unit: str = "percent"  # pixel / percent
    y_unit: str = "percent"
    # 大小
    scale: float = 1.0
    width: int | None = None
    height: int | None = None
    # 透明度
    opacity: float = 1.0
    # 时间范围
    start_time: float = 0.0
    duration: float = 0.0  # 0 表示持续到结束
    # 动画
    fade_in: float = 0.0
    fade_out: float = 0.0
    # 层级
    z_index: int = 10
    # 素材
    image_url: str = ""
    preset_id: str = ""

    @classmethod
    def from_dict(cls, data: dict[str, Any] | None) -> "ImageStickerConfig":
        """从字典创建配置，带安全类型转换."""
        if not data or not isinstance(data, dict):
            return cls()

        def safe_float(key: str, default: float) -> float:
            try:
                val = data.get(key, default)
                return float(val) if val is not None else default
            except (TypeError, ValueError):
                return default

        def safe_int(key: str, default: int | None) -> int | None:
            val = data.get(key, default)
            if val is None:
                return None
            try:
                return int(val)
            except (TypeError, ValueError):
                return default

        x_val = data.get("x")
        y_val = data.get("y")
        try:
            x_float = float(x_val) if x_val is not None else None
        except (TypeError, ValueError):
            x_float = None
        try:
            y_float = float(y_val) if y_val is not None else None
        except (TypeError, ValueError):
            y_float = None

        return cls(
            enabled=bool(data.get("enabled", False)),
            type=str(data.get("type", "image")),
            position=str(data.get("position", "top_right")),
            x=x_float,
            y=y_float,
            x_unit=str(data.get("x_unit", "percent")),
            y_unit=str(data.get("y_unit", "percent")),
            scale=max(0.01, safe_float("scale", 1.0)),
            width=safe_int("width", None),
            height=safe_int("height", None),
            opacity=max(0.0, min(1.0, safe_float("opacity", 1.0))),
            start_time=max(0.0, safe_float("start_time", 0.0)),
            duration=max(0.0, safe_float("duration", 0.0)),
            fade_in=max(0.0, safe_float("fade_in", 0.0)),
            fade_out=max(0.0, safe_float("fade_out", 0.0)),
            z_index=safe_int("z_index", 10) or 10,
            image_url=str(data.get("image_url", "")),
            preset_id=str(data.get("preset_id", "")),
        )

    @property
    def has_time_range(self) -> bool:
        """是否有明确的时间范围."""
        return self.duration > 0

    @property
    def end_time(self) -> float:
        """结束时间（仅当 duration>0 时有意义）."""
        return self.start_time + max(0.0, self.duration)


@dataclass
class TextStickerConfig:
    """文字贴纸配置."""

    enabled: bool = False
    type: str = "text"
    text: str = ""
    # 字体
    font_size: int = 36
    font_color: str = "#FFFFFF"
    font_family: str = "sans"
    # 描边
    stroke_color: str = "#000000"
    stroke_width: int = 2
    # 阴影
    shadow_color: str = "#000000"
    shadow_x: int = 2
    shadow_y: int = 2
    shadow_alpha: float = 0.5
    # 位置
    position: str = "center"
    x: float | None = None
    y: float | None = None
    x_unit: str = "percent"
    y_unit: str = "percent"
    # 时间范围
    start_time: float = 0.0
    duration: float = 0.0
    # 动画
    fade_in: float = 0.0
    fade_out: float = 0.0
    # 层级
    z_index: int = 10
    # 背景框
    bg_color: str = ""
    bg_padding: int = 8
    bg_alpha: float = 0.8
    bg_corner_radius: int = 8

    @classmethod
    def from_dict(cls, data: dict[str, Any] | None) -> "TextStickerConfig":
        """从字典创建配置，带安全类型转换."""
        if not data or not isinstance(data, dict):
            return cls()

        def safe_float(key: str, default: float) -> float:
            try:
                val = data.get(key, default)
                return float(val) if val is not None else default
            except (TypeError, ValueError):
                return default

        def safe_int(key: str, default: int) -> int:
            try:
                val = data.get(key, default)
                return int(val) if val is not None else default
            except (TypeError, ValueError):
                return default

        x_val = data.get("x")
        y_val = data.get("y")
        try:
            x_float = float(x_val) if x_val is not None else None
        except (TypeError, ValueError):
            x_float = None
        try:
            y_float = float(y_val) if y_val is not None else None
        except (TypeError, ValueError):
            y_float = None

        return cls(
            enabled=bool(data.get("enabled", False)),
            type=str(data.get("type", "text")),
            text=str(data.get("text", "")),
            font_size=max(1, safe_int("font_size", 36)),
            font_color=str(data.get("font_color", "#FFFFFF")),
            font_family=str(data.get("font_family", "sans")),
            stroke_color=str(data.get("stroke_color", "#000000")),
            stroke_width=max(0, safe_int("stroke_width", 2)),
            shadow_color=str(data.get("shadow_color", "#000000")),
            shadow_x=safe_int("shadow_x", 2),
            shadow_y=safe_int("shadow_y", 2),
            shadow_alpha=max(0.0, min(1.0, safe_float("shadow_alpha", 0.5))),
            position=str(data.get("position", "center")),
            x=x_float,
            y=y_float,
            x_unit=str(data.get("x_unit", "percent")),
            y_unit=str(data.get("y_unit", "percent")),
            start_time=max(0.0, safe_float("start_time", 0.0)),
            duration=max(0.0, safe_float("duration", 0.0)),
            fade_in=max(0.0, safe_float("fade_in", 0.0)),
            fade_out=max(0.0, safe_float("fade_out", 0.0)),
            z_index=safe_int("z_index", 10),
            bg_color=str(data.get("bg_color", "")),
            bg_padding=max(0, safe_int("bg_padding", 8)),
            bg_alpha=max(0.0, min(1.0, safe_float("bg_alpha", 0.8))),
            bg_corner_radius=max(0, safe_int("bg_corner_radius", 8)),
        )

    @property
    def has_background(self) -> bool:
        """是否有背景框."""
        return bool(self.bg_color)

    @property
    def has_time_range(self) -> bool:
        """是否有明确的时间范围."""
        return self.duration > 0


@dataclass
class StickerOverlayResult:
    """贴纸叠加结果."""

    filter_str: str
    output_label: str
    extra_inputs: list[str] = field(default_factory=list)


# ── 工具函数 ──────────────────────────────────────────────────────────────────


def resolve_sticker_position(
    position: str,
    x: float | None,
    y: float | None,
    x_unit: str,
    y_unit: str,
    canvas_w: int,
    canvas_h: int,
    sticker_w: int = 0,
    sticker_h: int = 0,
) -> tuple[float, float]:
    """解析贴纸位置（像素坐标）.

    优先级：自定义坐标 > 9宫格预设
    返回贴纸左上角的像素坐标，已钳制在画布内。
    """
    # 先取预设的基准位置
    if position in POSITION_PRESETS:
        px, py = POSITION_PRESETS[position]
    else:
        px, py = 0.5, 0.5  # 默认居中

    # 自定义坐标覆盖
    if x is not None:
        if x_unit == "percent":
            px = max(0.0, min(1.0, x / 100.0))
        else:
            px = x / canvas_w if canvas_w > 0 else 0.5

    if y is not None:
        if y_unit == "percent":
            py = max(0.0, min(1.0, y / 100.0))
        else:
            py = y / canvas_h if canvas_h > 0 else 0.5

    # 转换为像素坐标（考虑贴纸尺寸，使位置为贴纸中心点）
    pos_x = px * canvas_w - sticker_w / 2
    pos_y = py * canvas_h - sticker_h / 2

    # 钳制在画布内
    pos_x = max(0, min(pos_x, canvas_w - sticker_w))
    pos_y = max(0, min(pos_y, canvas_h - sticker_h))

    return pos_x, pos_y


def parse_stickers_from_config(config: dict[str, Any] | None) -> list[dict[str, Any]]:
    """从 plan.config.stickers 解析贴纸列表."""
    if not config:
        return []
    stickers = config.get("stickers", [])
    if not isinstance(stickers, list):
        return []
    return stickers


def get_sticker_categories() -> list[tuple[str, str]]:
    """获取贴纸分类列表."""
    return list(STICKER_CATEGORIES)