"""
主題配置模組 - 定義亮色和深色主題的顏色方案
支援 Gradio UI 和 Plotly 圖表的主題切換
"""

# 亮色主題配置
LIGHT_THEME = {
    "colors": {
        "primary": "#1f77b4",      # 主要顏色
        "secondary": "#ff7f0e",    # 次要顏色
        "accent": "#2ca02c",       # 強調色
        "background": "#ffffff",   # 背景色
        "surface": "#f8f9fa",      # 表面色
        "text": "#212529",         # 文字色
        "text_secondary": "#6c757d", # 次要文字色
        "border": "#dee2e6",       # 邊框色
        "hover": "#e9ecef",        # 懸停色
        "success": "#28a745",      # 成功色
        "warning": "#ffc107",      # 警告色
        "error": "#dc3545",        # 錯誤色
    },
    "name": "light"
}

# 深色主題配置
DARK_THEME = {
    "colors": {
        "primary": "#4a9eff",      # 主要顏色（調整以增加對比度）
        "secondary": "#ffb366",    # 次要顏色
        "accent": "#66dd88",       # 強調色
        "background": "#1a1a1a",   # 背景色
        "surface": "#2d2d2d",      # 表面色
        "text": "#e8e8e8",         # 文字色
        "text_secondary": "#a0a0a0", # 次要文字色
        "border": "#404040",       # 邊框色
        "hover": "#383838",        # 懸停色
        "success": "#4ade80",      # 成功色
        "warning": "#facc15",      # 警告色
        "error": "#ef4444",        # 錯誤色
    },
    "name": "dark"
}

# 預設主題
DEFAULT_THEME = LIGHT_THEME

def get_theme(theme_name="light"):
    """
    根據主題名稱取得主題配置
    
    Args:
        theme_name (str): 'light' 或 'dark'
        
    Returns:
        dict: 主題配置字典
    """
    if theme_name.lower() == "dark":
        return DARK_THEME
    return LIGHT_THEME

def get_theme_colors(theme_name="light"):
    """
    取得指定主題的顏色字典
    
    Args:
        theme_name (str): 'light' 或 'dark'
        
    Returns:
        dict: 顏色變數字典
    """
    theme = get_theme(theme_name)
    return theme.get("colors", {})

def create_gradio_theme(theme_name="light"):
    """
    建立 Gradio 主題配置物件
    
    Args:
        theme_name (str): 'light' 或 'dark'
        
    Returns:
        gr.themes.Base: Gradio 主題物件
    """
    import gradio as gr
    
    colors = get_theme_colors(theme_name)
    
    if theme_name.lower() == "dark":
        return gr.themes.Base(
            primary_hue="blue",
            secondary_hue="orange",
        ).set(
            body_background_fill=colors["background"],
            body_background_fill_secondary=colors["surface"],
            border_color_accent=colors["accent"],
            border_color_primary=colors["border"],
            link_text_color=colors["primary"],
            link_text_color_hover=colors["accent"],
            link_text_color_visited=colors["secondary"],
        )
    else:
        return gr.themes.Base(
            primary_hue="blue",
            secondary_hue="orange",
        ).set(
            body_background_fill=colors["background"],
            body_background_fill_secondary=colors["surface"],
            border_color_accent=colors["accent"],
            border_color_primary=colors["border"],
            link_text_color=colors["primary"],
            link_text_color_hover=colors["accent"],
            link_text_color_visited=colors["secondary"],
        )

def get_plotly_theme(theme_name="light"):
    """
    取得 Plotly 圖表的主題配置
    
    Args:
        theme_name (str): 'light' 或 'dark'
        
    Returns:
        dict: Plotly 主題參數
    """
    colors = get_theme_colors(theme_name)
    
    if theme_name.lower() == "dark":
        return {
            "template": "plotly_dark",
            "paper_bgcolor": colors["background"],
            "plot_bgcolor": colors["surface"],
            "font": {
                "color": colors["text"],
                "family": "Arial, sans-serif",
                "size": 12
            },
            "colorway": [
                colors["primary"],
                colors["secondary"],
                colors["accent"],
                colors["warning"],
                colors["error"],
                colors["success"]
            ]
        }
    else:
        return {
            "template": "plotly",
            "paper_bgcolor": colors["background"],
            "plot_bgcolor": colors["surface"],
            "font": {
                "color": colors["text"],
                "family": "Arial, sans-serif",
                "size": 12
            },
            "colorway": [
                colors["primary"],
                colors["secondary"],
                colors["accent"],
                colors["warning"],
                colors["error"],
                colors["success"]
            ]
        }

def get_default_theme():
    """
    取得預設主題（伺服器端預設值）
    當 localStorage 不可用時作為備選方案
    
    Returns:
        str: 預設主題名稱 ('light')
    """
    return "light"

def apply_theme_fallback(theme_name=None):
    """
    當 localStorage 或其他機制失敗時的備選方案
    
    Args:
        theme_name (str): 試圖套用的主題名稱，為 None 時使用預設
        
    Returns:
        str: 實際套用的主題名稱
    """
    if theme_name is None or theme_name not in ["light", "dark"]:
        return get_default_theme()
    return theme_name