orion/app/core/theme_presets.py

# app/core/theme_presets.py
"""
Theme presets for vendor shops.

Presets define default color schemes, fonts, and layouts that vendors can choose from.
Each preset provides a complete theme configuration that can be customized further.
"""

from app.modules.cms.models import VendorTheme

THEME_PRESETS = {
    "default": {
        "colors": {
            "primary": "#6366f1",  # Indigo
            "secondary": "#8b5cf6",  # Purple
            "accent": "#ec4899",  # Pink
            "background": "#ffffff",  # White
            "text": "#1f2937",  # Gray-800
            "border": "#e5e7eb",  # Gray-200
        },
        "fonts": {"heading": "Inter, sans-serif", "body": "Inter, sans-serif"},
        "layout": {"style": "grid", "header": "fixed", "product_card": "modern"},
    },
    "modern": {
        "colors": {
            "primary": "#6366f1",  # Indigo - Modern tech look
            "secondary": "#8b5cf6",  # Purple
            "accent": "#ec4899",  # Pink
            "background": "#ffffff",  # White
            "text": "#1f2937",  # Gray-800
            "border": "#e5e7eb",  # Gray-200
        },
        "fonts": {"heading": "Inter, sans-serif", "body": "Inter, sans-serif"},
        "layout": {"style": "grid", "header": "fixed", "product_card": "modern"},
    },
    "classic": {
        "colors": {
            "primary": "#1e40af",  # Dark blue - Traditional
            "secondary": "#7c3aed",  # Purple
            "accent": "#dc2626",  # Red
            "background": "#ffffff",  # White
            "text": "#1f2937",  # Gray-800
            "border": "#d1d5db",  # Gray-300
        },
        "fonts": {"heading": "Georgia, serif", "body": "Arial, sans-serif"},
        "layout": {"style": "list", "header": "static", "product_card": "classic"},
    },
    "minimal": {
        "colors": {
            "primary": "#000000",  # Black - Ultra minimal
            "secondary": "#404040",  # Dark gray
            "accent": "#666666",  # Medium gray
            "background": "#ffffff",  # White
            "text": "#000000",  # Black
            "border": "#e5e7eb",  # Light gray
        },
        "fonts": {"heading": "Helvetica, sans-serif", "body": "Helvetica, sans-serif"},
        "layout": {"style": "grid", "header": "transparent", "product_card": "minimal"},
    },
    "vibrant": {
        "colors": {
            "primary": "#f59e0b",  # Orange - Bold & energetic
            "secondary": "#ef4444",  # Red
            "accent": "#8b5cf6",  # Purple
            "background": "#ffffff",  # White
            "text": "#1f2937",  # Gray-800
            "border": "#fbbf24",  # Yellow
        },
        "fonts": {"heading": "Poppins, sans-serif", "body": "Open Sans, sans-serif"},
        "layout": {"style": "masonry", "header": "fixed", "product_card": "modern"},
    },
    "elegant": {
        "colors": {
            "primary": "#6b7280",  # Gray - Sophisticated
            "secondary": "#374151",  # Dark gray
            "accent": "#d97706",  # Amber
            "background": "#ffffff",  # White
            "text": "#1f2937",  # Gray-800
            "border": "#e5e7eb",  # Gray-200
        },
        "fonts": {"heading": "Playfair Display, serif", "body": "Lato, sans-serif"},
        "layout": {"style": "grid", "header": "fixed", "product_card": "classic"},
    },
    "nature": {
        "colors": {
            "primary": "#059669",  # Green - Natural & eco
            "secondary": "#10b981",  # Emerald
            "accent": "#f59e0b",  # Amber
            "background": "#ffffff",  # White
            "text": "#1f2937",  # Gray-800
            "border": "#d1fae5",  # Light green
        },
        "fonts": {"heading": "Montserrat, sans-serif", "body": "Open Sans, sans-serif"},
        "layout": {"style": "grid", "header": "fixed", "product_card": "modern"},
    },
}


def get_preset(preset_name: str) -> dict:
    """
    Get a theme preset by name.

    Args:
        preset_name: Name of the preset (e.g., 'modern', 'classic')

    Returns:
        dict: Theme configuration

    Raises:
        ValueError: If preset name is unknown
    """
    if preset_name not in THEME_PRESETS:
        available = ", ".join(THEME_PRESETS.keys())
        raise ValueError(f"Unknown preset: {preset_name}. Available: {available}")

    return THEME_PRESETS[preset_name]


def apply_preset(theme: VendorTheme, preset_name: str) -> VendorTheme:
    """
    Apply a preset to a vendor theme.

    Args:
        theme: VendorTheme instance to update
        preset_name: Name of the preset to apply

    Returns:
        VendorTheme: Updated theme instance

    Raises:
        ValueError: If preset name is unknown

    Example:
        theme = VendorTheme(vendor_id=1)
        apply_preset(theme, "modern")
        db.add(theme)
        db.commit()
    """
    preset = get_preset(preset_name)

    # Set theme name
    theme.theme_name = preset_name

    # Apply colors (all of them!)
    theme.colors = preset["colors"]

    # Apply fonts
    theme.font_family_heading = preset["fonts"]["heading"]
    theme.font_family_body = preset["fonts"]["body"]

    # Apply layout settings
    theme.layout_style = preset["layout"]["style"]
    theme.header_style = preset["layout"]["header"]
    theme.product_card_style = preset["layout"]["product_card"]

    # Mark as active
    theme.is_active = True

    return theme


def get_available_presets() -> list[str]:
    """
    Get list of available preset names.

    Returns:
        list: Available preset names
    """
    return list(THEME_PRESETS.keys())


def get_preset_preview(preset_name: str) -> dict:
    """
    Get preview information for a preset (for UI display).

    Args:
        preset_name: Name of the preset

    Returns:
        dict: Preview info with colors, fonts, description
    """
    preset = get_preset(preset_name)

    descriptions = {
        "default": "Clean and professional - perfect for getting started",
        "modern": "Contemporary tech-inspired design with vibrant colors",
        "classic": "Traditional and trustworthy with serif typography",
        "minimal": "Ultra-clean black and white aesthetic",
        "vibrant": "Bold and energetic with bright accent colors",
        "elegant": "Sophisticated gray tones with refined typography",
        "nature": "Fresh and eco-friendly green color palette",
    }

    return {
        "name": preset_name,
        "description": descriptions.get(preset_name, ""),
        "primary_color": preset["colors"]["primary"],
        "secondary_color": preset["colors"]["secondary"],
        "accent_color": preset["colors"]["accent"],
        "heading_font": preset["fonts"]["heading"],
        "body_font": preset["fonts"]["body"],
        "layout_style": preset["layout"]["style"],
    }


def create_custom_preset(
    colors: dict, fonts: dict, layout: dict, name: str = "custom"
) -> dict:
    """
    Create a custom preset from provided settings.

    Args:
        colors: Dict with primary, secondary, accent, background, text, border
        fonts: Dict with heading and body fonts
        layout: Dict with style, header, product_card
        name: Name for the custom preset

    Returns:
        dict: Custom preset configuration

    Example:
        custom = create_custom_preset(
            colors={"primary": "#ff0000", "secondary": "#00ff00", ...},
            fonts={"heading": "Arial", "body": "Arial"},
            layout={"style": "grid", "header": "fixed", "product_card": "modern"},
            name="my_custom_theme"
        )
    """
    # Validate colors
    required_colors = ["primary", "secondary", "accent", "background", "text", "border"]
    for color_key in required_colors:
        if color_key not in colors:
            colors[color_key] = THEME_PRESETS["default"]["colors"][color_key]

    # Validate fonts
    if "heading" not in fonts:
        fonts["heading"] = "Inter, sans-serif"
    if "body" not in fonts:
        fonts["body"] = "Inter, sans-serif"

    # Validate layout
    if "style" not in layout:
        layout["style"] = "grid"
    if "header" not in layout:
        layout["header"] = "fixed"
    if "product_card" not in layout:
        layout["product_card"] = "modern"

    return {"colors": colors, "fonts": fonts, "layout": layout}