from django.db import models
import uuid


def default_design():
    """默认设计配置（整副牌共享）"""
    return {
        # 全局背景色（整副牌默认用这个，个别牌可覆盖）
        'background_color': '#FFFFFF',
        'background_image': None,            # 整副牌背景图，相对 media 的路径
        # 整副牌边框
        'border_color': '#333333',
        'border_width': 2,
        # 4 个花色符号：可以上传图片，也可保持 None（用字体符号）
        'suit_symbols': {
            'spade':   {'type': 'text', 'value': '♠', 'asset_id': None, 'color': '#000000'},
            'heart':   {'type': 'text', 'value': '♥', 'asset_id': None, 'color': '#E53935'},
            'club':    {'type': 'text', 'value': '♣', 'asset_id': None, 'color': '#000000'},
            'diamond': {'type': 'text', 'value': '♦', 'asset_id': None, 'color': '#E53935'},
        },
        # 数字牌角标和中心花色符号的大小（占牌面宽度比例）
        'corner_size_ratio': 0.13,
        'pip_size_ratio': 0.16,
        # 字体
        'font_family': 'Times New Roman',
        'font_color': '#000000',             # 角标数字颜色
        # 角标布局微调（相对位置 0~1）
        'corner_offset': {'x': 0, 'y': 0},
    }


def default_card_overrides():
    """每张牌可独立覆盖的项目级设置（key=card_key, value 覆盖项）"""
    return {
        # 例如 'joker-big': { 'background_color': '#1B5E20' }
    }


def default_back_design():
    """背面专用设计配置（独立于正面）"""
    return {
        'background_color': '#1A237E',
        'border_color': '#C0A050',
        'border_width': 3,
        'pattern_color': None,
        'image': None,
        'image_dx': 0,
        'image_dy': 0,
        'image_scale': 1,
    }


class Project(models.Model):
    """项目配置模型"""
    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    name = models.CharField(max_length=100)
    template_id = models.CharField(max_length=50, default='classic')
    card_width = models.IntegerField(default=750)
    card_height = models.IntegerField(default=1050)
    # 项目级设计配置
    design = models.JSONField(default=default_design)
    # 每张牌对项目级配置的覆盖
    card_overrides = models.JSONField(default=default_card_overrides)
    # 背面专用设计配置（独立于正面 design）
    back_design = models.JSONField(default=default_back_design)
    # 数字牌花色位置微调（相对 0~1）
    # { '1': [{'dx':0,'dy':0,'scale':1}, ...], '2': [...], ... }
    number_layout = models.JSONField(default=dict)
    # JQK 人物图的水平翻转（每张牌独立）
    face_orientations = models.JSONField(default=dict)
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)

    # 导出设置
    export_resolution = models.CharField(max_length=20, default='standard')
    export_include_back = models.BooleanField(default=True)

    def __str__(self):
        return self.name

    class Meta:
        ordering = ['-updated_at']


class Asset(models.Model):
    """项目素材模型"""
    project = models.ForeignKey(Project, on_delete=models.CASCADE, related_name='assets')
    asset_type = models.CharField(max_length=20)  # 'suit_symbol', 'face_card', 'joker', 'back', 'border', 'background'
    asset_key = models.CharField(max_length=50)    # 如 'spade', 'heart-J', 'big_joker'
    file_path = models.CharField(max_length=255, blank=True)  # 相对于media目录
    file_name = models.CharField(max_length=100, blank=True)
    width = models.IntegerField(null=True, blank=True)
    height = models.IntegerField(null=True, blank=True)
    uploaded_at = models.DateTimeField(auto_now_add=True)

    def __str__(self):
        return f"{self.asset_type}:{self.asset_key}"

    class Meta:
        ordering = ['-uploaded_at']


class CardLayer(models.Model):
    """牌面图层配置模型（图层顺序、可见性等）"""
    project = models.ForeignKey(Project, on_delete=models.CASCADE, related_name='layers')
    card_type = models.CharField(max_length=20)  # 'number', 'face', 'joker', 'back'
    card_key = models.CharField(max_length=30)   # 'spade-A', 'heart-K', 'joker-big'
    layer_name = models.CharField(max_length=50)
    layer_type = models.CharField(max_length=20)  # 'background', 'border', 'pattern', 'image', 'text', 'symbol'
    visible = models.BooleanField(default=True)
    locked = models.BooleanField(default=False)
    opacity = models.FloatField(default=1.0)
    z_index = models.IntegerField(default=0)

    # 图层属性（JSON存储）
    properties = models.JSONField(default=dict)

    def __str__(self):
        return f"{self.card_key}-{self.layer_name}"

    class Meta:
        ordering = ['card_key', 'z_index']


class LibraryAsset(models.Model):
    """预设素材库（与 Project 无关，全局共享）
    主题分类：classical/modern/astronomy/minimal ...
    角色：J / Q / K / joker
    """
    id = models.BigAutoField(primary_key=True)
    theme_id = models.CharField(max_length=50, db_index=True)   # classical / modern ...
    theme_name = models.CharField(max_length=100)              # 古典宫廷 / 现代人物 ...
    role = models.CharField(max_length=10, db_index=True)      # 'J' / 'Q' / 'K' / 'joker'
    role_name = models.CharField(max_length=50)                # '王子' / '皇后' ...
    asset_id = models.CharField(max_length=50)                 # 'prince' / 'queen' ...
    label = models.CharField(max_length=100)                   # '古典·王子'
    description = models.CharField(max_length=255, blank=True)
    file_path = models.CharField(max_length=255)               # library/classical/prince.svg
    file_name = models.CharField(max_length=100)
    created_at = models.DateTimeField(auto_now_add=True)

    def __str__(self):
        return f'{self.theme_name}/{self.role_name}'

    class Meta:
        ordering = ['theme_id', 'role', 'asset_id']
        unique_together = [['theme_id', 'asset_id']]