"""
Element Schema for UI Comparison
Standardized structure for elements extracted from both Figma and Website DOM.
Designed for checkout page comparison but extensible to other page types.
"""

from typing import Dict, List, Optional, Any
from dataclasses import dataclass, field, asdict
from enum import Enum
import json


class ElementType(str, Enum):
    """Normalized element types across Figma and DOM."""
    BUTTON = "button"
    INPUT = "input"
    TEXT = "text"
    HEADING = "heading"
    LABEL = "label"
    IMAGE = "image"
    ICON = "icon"
    CONTAINER = "container"
    LINK = "link"
    CHECKBOX = "checkbox"
    RADIO = "radio"
    SELECT = "select"
    CARD = "card"
    DIVIDER = "divider"
    PRICE = "price"
    BADGE = "badge"
    FORM = "form"
    UNKNOWN = "unknown"


# Mapping Figma node types to our normalized types
FIGMA_TYPE_MAP = {
    "TEXT": ElementType.TEXT,
    "RECTANGLE": ElementType.CONTAINER,
    "ELLIPSE": ElementType.ICON,
    "FRAME": ElementType.CONTAINER,
    "GROUP": ElementType.CONTAINER,
    "COMPONENT": ElementType.CONTAINER,
    "INSTANCE": ElementType.CONTAINER,
    "VECTOR": ElementType.ICON,
    "LINE": ElementType.DIVIDER,
    "IMAGE": ElementType.IMAGE,
}

# Mapping DOM elements to our normalized types
DOM_TYPE_MAP = {
    "button": ElementType.BUTTON,
    "input": ElementType.INPUT,
    "textarea": ElementType.INPUT,
    "select": ElementType.SELECT,
    "a": ElementType.LINK,
    "img": ElementType.IMAGE,
    "svg": ElementType.ICON,
    "h1": ElementType.HEADING,
    "h2": ElementType.HEADING,
    "h3": ElementType.HEADING,
    "h4": ElementType.HEADING,
    "h5": ElementType.HEADING,
    "h6": ElementType.HEADING,
    "p": ElementType.TEXT,
    "span": ElementType.TEXT,
    "label": ElementType.LABEL,
    "div": ElementType.CONTAINER,
    "section": ElementType.CONTAINER,
    "article": ElementType.CONTAINER,
    "form": ElementType.FORM,
    "hr": ElementType.DIVIDER,
}


@dataclass
class ElementBounds:
    """Position and dimensions of an element."""
    x: float
    y: float
    width: float
    height: float
    
    def to_dict(self) -> Dict:
        return asdict(self)
    
    def area(self) -> float:
        return self.width * self.height
    
    def center(self) -> tuple:
        return (self.x + self.width / 2, self.y + self.height / 2)
    
    def overlaps(self, other: 'ElementBounds', threshold: float = 0.5) -> bool:
        """Check if this bounds overlaps with another by at least threshold amount."""
        x_overlap = max(0, min(self.x + self.width, other.x + other.width) - max(self.x, other.x))
        y_overlap = max(0, min(self.y + self.height, other.y + other.height) - max(self.y, other.y))
        overlap_area = x_overlap * y_overlap
        min_area = min(self.area(), other.area())
        if min_area == 0:
            return False
        return (overlap_area / min_area) >= threshold


@dataclass
class ElementStyles:
    """Visual styles of an element."""
    # Colors (stored as hex strings like "#FFFFFF")
    background_color: Optional[str] = None
    text_color: Optional[str] = None
    border_color: Optional[str] = None
    
    # Typography
    font_family: Optional[str] = None
    font_size: Optional[float] = None
    font_weight: Optional[int] = None
    line_height: Optional[float] = None
    text_align: Optional[str] = None
    letter_spacing: Optional[float] = None
    
    # Borders
    border_width: Optional[float] = None
    border_radius: Optional[float] = None
    border_style: Optional[str] = None
    
    # Spacing (padding)
    padding_top: Optional[float] = None
    padding_right: Optional[float] = None
    padding_bottom: Optional[float] = None
    padding_left: Optional[float] = None
    
    # Effects
    opacity: Optional[float] = None
    box_shadow: Optional[str] = None
    
    def to_dict(self) -> Dict:
        return {k: v for k, v in asdict(self).items() if v is not None}


@dataclass
class UIElement:
    """
    Unified element representation for comparison.
    Works for both Figma nodes and DOM elements.
    """
    id: str
    element_type: ElementType
    name: str
    bounds: ElementBounds
    styles: ElementStyles
    
    # Content
    text_content: Optional[str] = None
    placeholder: Optional[str] = None
    
    # Hierarchy
    parent_id: Optional[str] = None
    children_ids: List[str] = field(default_factory=list)
    depth: int = 0
    
    # Source info
    source: str = ""  # "figma" or "website"
    original_type: str = ""  # Original type before normalization
    
    # For checkout-specific detection
    is_interactive: bool = False
    input_type: Optional[str] = None  # "text", "email", "tel", "number", etc.
    
    # Matching (populated during comparison phase)
    matched_element_id: Optional[str] = None
    match_confidence: float = 0.0
    
    def to_dict(self) -> Dict:
        return {
            "id": self.id,
            "element_type": self.element_type.value,
            "name": self.name,
            "bounds": self.bounds.to_dict(),
            "styles": self.styles.to_dict(),
            "text_content": self.text_content,
            "placeholder": self.placeholder,
            "parent_id": self.parent_id,
            "children_ids": self.children_ids,
            "depth": self.depth,
            "source": self.source,
            "original_type": self.original_type,
            "is_interactive": self.is_interactive,
            "input_type": self.input_type,
            "matched_element_id": self.matched_element_id,
            "match_confidence": self.match_confidence
        }
    
    @classmethod
    def from_dict(cls, data: Dict) -> 'UIElement':
        """Create UIElement from dictionary."""
        bounds = ElementBounds(**data["bounds"])
        styles = ElementStyles(**data.get("styles", {}))
        return cls(
            id=data["id"],
            element_type=ElementType(data["element_type"]),
            name=data["name"],
            bounds=bounds,
            styles=styles,
            text_content=data.get("text_content"),
            placeholder=data.get("placeholder"),
            parent_id=data.get("parent_id"),
            children_ids=data.get("children_ids", []),
            depth=data.get("depth", 0),
            source=data.get("source", ""),
            original_type=data.get("original_type", ""),
            is_interactive=data.get("is_interactive", False),
            input_type=data.get("input_type"),
            matched_element_id=data.get("matched_element_id"),
            match_confidence=data.get("match_confidence", 0.0)
        )


@dataclass
class ElementDifference:
    """Represents a difference between Figma and Website elements."""
    category: str  # "typography", "color", "spacing", "size", "missing", "extra", "position"
    severity: str  # "high", "medium", "low"
    property_name: str
    figma_value: Any
    website_value: Any
    element_name: str
    element_type: str
    description: str
    
    # Location info
    figma_element_id: Optional[str] = None
    website_element_id: Optional[str] = None
    viewport: str = "desktop"
    
    def to_dict(self) -> Dict:
        return asdict(self)


@dataclass  
class ComparisonResult:
    """Complete comparison result between Figma and Website."""
    viewport: str
    overall_score: float  # 0-100
    
    # Element counts
    figma_element_count: int
    website_element_count: int
    matched_count: int
    missing_in_website: int
    extra_in_website: int
    
    # Differences by category
    differences: List[ElementDifference] = field(default_factory=list)
    
    # Score breakdown
    layout_score: float = 100.0
    typography_score: float = 100.0
    color_score: float = 100.0
    spacing_score: float = 100.0
    
    # AI analysis (populated by Agent 5)
    ai_insights: Optional[str] = None
    ai_priority_issues: List[str] = field(default_factory=list)
    
    def to_dict(self) -> Dict:
        return {
            "viewport": self.viewport,
            "overall_score": self.overall_score,
            "figma_element_count": self.figma_element_count,
            "website_element_count": self.website_element_count,
            "matched_count": self.matched_count,
            "missing_in_website": self.missing_in_website,
            "extra_in_website": self.extra_in_website,
            "differences": [d.to_dict() for d in self.differences],
            "layout_score": self.layout_score,
            "typography_score": self.typography_score,
            "color_score": self.color_score,
            "spacing_score": self.spacing_score,
            "ai_insights": self.ai_insights,
            "ai_priority_issues": self.ai_priority_issues
        }


def rgb_to_hex(r: float, g: float, b: float, normalized: bool = True) -> str:
    """
    Convert RGB values to hex string.
    
    Args:
        r, g, b: RGB values
        normalized: If True, values are 0-1 range (Figma). If False, 0-255 range.
    """
    if normalized:
        r, g, b = int(r * 255), int(g * 255), int(b * 255)
    else:
        r, g, b = int(r), int(g), int(b)
    return f"#{r:02x}{g:02x}{b:02x}".upper()


def hex_to_rgb(hex_color: str) -> tuple:
    """Convert hex color to RGB tuple (0-255 range)."""
    hex_color = hex_color.lstrip('#')
    return tuple(int(hex_color[i:i+2], 16) for i in (0, 2, 4))


def color_distance(color1: str, color2: str) -> float:
    """
    Calculate the perceptual distance between two hex colors.
    Returns a value 0-100 (0 = identical, 100 = maximum difference).
    """
    if not color1 or not color2:
        return 100.0
    
    try:
        rgb1 = hex_to_rgb(color1)
        rgb2 = hex_to_rgb(color2)
        
        # Simple Euclidean distance in RGB space
        distance = ((rgb1[0] - rgb2[0])**2 + 
                   (rgb1[1] - rgb2[1])**2 + 
                   (rgb1[2] - rgb2[2])**2) ** 0.5
        
        # Normalize to 0-100 (max distance is sqrt(3 * 255^2) ≈ 441)
        return (distance / 441.67) * 100
    except:
        return 100.0


def serialize_elements(elements: List[UIElement]) -> str:
    """Serialize a list of UIElements to JSON string."""
    return json.dumps([e.to_dict() for e in elements], indent=2)


def deserialize_elements(json_str: str) -> List[UIElement]:
    """Deserialize JSON string to list of UIElements."""
    data = json.loads(json_str)
    return [UIElement.from_dict(d) for d in data]