"""
数据模型模块
"""
from PyQt6.QtCore import QObject, pyqtSignal as Signal, pyqtProperty as Property, pyqtSlot as Slot
from typing import Dict, List, Optional
import json


class TextItem(QObject):
    """文本项数据模型"""
    valueChanged = Signal(str)
    
    def __init__(self, parent=None):
        super().__init__(parent)
        self._field_name: str = ""
        self._x: float = 0.0
        self._y: float = 0.0
        self._font_size: int = 16
        self._color: str = "#FFFFFF"
        self._value: str = "--"
    
    def getFieldName(self):
        return self._field_name
    
    def setFieldName(self, value: str):
        if self._field_name != value:
            self._field_name = value
            self.valueChanged.emit(self._field_name)
    
    fieldName = Property(str, getFieldName, setFieldName, notify=valueChanged)
    
    def getX(self):
        return self._x
    
    def setX(self, value: float):
        if self._x != value:
            self._x = value
            self.valueChanged.emit(str(self._x))
    
    x = Property(float, getX, setX, notify=valueChanged)
    
    def getY(self):
        return self._y
    
    def setY(self, value: float):
        if self._y != value:
            self._y = value
            self.valueChanged.emit(str(self._y))
    
    y = Property(float, getY, setY, notify=valueChanged)
    
    def getFontSize(self):
        return self._font_size
    
    def setFontSize(self, value: int):
        if self._font_size != value:
            self._font_size = value
            self.valueChanged.emit(str(self._font_size))
    
    fontSize = Property(int, getFontSize, setFontSize, notify=valueChanged)
    
    def getColor(self):
        return self._color
    
    def setColor(self, value: str):
        if self._color != value:
            self._color = value
            self.valueChanged.emit(self._color)
    
    color = Property(str, getColor, setColor, notify=valueChanged)
    
    def getValue(self):
        return self._value
    
    def setValue(self, v: str):
        if self._value != v:
            self._value = v
            self.valueChanged.emit(self._value)
    
    value = Property(str, getValue, setValue, notify=valueChanged)
    
    def toDict(self) -> dict:
        """转换为字典"""
        return {
            "fieldName": self._field_name,
            "x": self._x,
            "y": self._y,
            "fontSize": self._font_size,
            "color": self._color
        }
    
    def fromDict(self, data: dict):
        """从字典加载"""
        self._field_name = data.get("fieldName", "")
        self._x = data.get("x", 0.0)
        self._y = data.get("y", 0.0)
        self._font_size = data.get("fontSize", 16)
        self._color = data.get("color", "#FFFFFF")


class DataModel(QObject):
    """数据模型，管理文本项和数据更新"""
    textItemsChanged = Signal()
    
    def __init__(self, parent=None):
        super().__init__(parent)
        self._text_items: List[TextItem] = []
        self._data_cache: Dict[str, str] = {}
    
    def getTextItems(self):
        return self._text_items
    
    textItems = Property(list, getTextItems, notify=textItemsChanged)
    
    @Slot(result='QObject*')
    def addTextItem(self):
        """添加文本项"""
        item = TextItem(self)
        self._text_items.append(item)
        self.textItemsChanged.emit()
        return item
    
    @Slot(int)
    def removeTextItem(self, index: int):
        """删除文本项"""
        if 0 <= index < len(self._text_items):
            item = self._text_items.pop(index)
            item.deleteLater()
            self.textItemsChanged.emit()
    
    @Slot(int, result='QObject*')
    def getTextItem(self, index: int):
        """获取文本项"""
        if 0 <= index < len(self._text_items):
            return self._text_items[index]
        return None
    
    @Slot(dict)
    def updateData(self, data: Dict[str, any]):
        """更新数据"""
        self._data_cache = {str(k): str(v) for k, v in data.items()}
        
        # 更新所有文本项的值
        for item in self._text_items:
            field_name = item.fieldName
            if field_name in self._data_cache:
                item.value = self._data_cache[field_name]
            else:
                item.value = "--"
    
    @Slot(result=str)
    def toJson(self) -> str:
        """导出为 JSON"""
        data = {
            "textItems": [item.toDict() for item in self._text_items]
        }
        return json.dumps(data, indent=2, ensure_ascii=False)
    
    @Slot(str)
    def fromJson(self, json_str: str):
        """从 JSON 加载"""
        try:
            data = json.loads(json_str)
            # 清空现有项
            for item in self._text_items:
                item.deleteLater()
            self._text_items.clear()
            
            # 加载新项
            for item_data in data.get("textItems", []):
                item = TextItem(self)
                item.fromDict(item_data)
                self._text_items.append(item)
            
            self.textItemsChanged.emit()
        except Exception as e:
            print(f"加载 JSON 失败: {e}")