import 'package:flutter/material.dart';
import '../utils/responsive_layout.dart';
import '../constants/app_constants.dart';

class ResponsiveButton extends StatelessWidget {
  final String text;
  final VoidCallback? onPressed;
  final IconData? icon;
  final Color? backgroundColor;
  final Color? textColor;
  final bool isLoading;
  final ButtonSize? size;

  const ResponsiveButton({
    super.key,
    required this.text,
    this.onPressed,
    this.icon,
    this.backgroundColor,
    this.textColor,
    this.isLoading = false,
    this.size,
  });

  @override
  Widget build(BuildContext context) {
    final buttonSize = size ?? (ResponsiveLayout.isMobile(context) ? ButtonSize.small : ButtonSize.medium);
    
    return SizedBox(
      width: ResponsiveLayout.isMobile(context) ? double.infinity : null,
      height: _getHeight(buttonSize),
      child: ElevatedButton(
        onPressed: isLoading ? null : onPressed,
        style: ElevatedButton.styleFrom(
          backgroundColor: backgroundColor ?? AppConstants.primaryColor,
          foregroundColor: textColor ?? Colors.white,
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(_getBorderRadius(buttonSize)),
          ),
          elevation: 2,
          padding: _getPadding(buttonSize),
        ),
        child: isLoading
            ? SizedBox(
                width: _getIconSize(buttonSize),
                height: _getIconSize(buttonSize),
                child: CircularProgressIndicator(
                  strokeWidth: 2,
                  valueColor: const AlwaysStoppedAnimation<Color>(Colors.white),
                ),
              )
            : Row(
                mainAxisSize: MainAxisSize.min,
                children: [
                  if (icon != null) ...[
                    Icon(icon, size: _getIconSize(buttonSize)),
                    const SizedBox(width: 8),
                  ],
                  Flexible(
                    child: Text(
                      text,
                      style: TextStyle(fontSize: _getFontSize(buttonSize)),
                      overflow: TextOverflow.ellipsis,
                    ),
                  ),
                ],
              ),
      ),
    );
  }

  double _getHeight(ButtonSize size) {
    switch (size) {
      case ButtonSize.small:
        return 36;
      case ButtonSize.medium:
        return 44;
      case ButtonSize.large:
        return 52;
    }
  }

  double _getBorderRadius(ButtonSize size) {
    switch (size) {
      case ButtonSize.small:
        return 6;
      case ButtonSize.medium:
        return 8;
      case ButtonSize.large:
        return 12;
    }
  }

  EdgeInsets _getPadding(ButtonSize size) {
    switch (size) {
      case ButtonSize.small:
        return const EdgeInsets.symmetric(horizontal: 16, vertical: 8);
      case ButtonSize.medium:
        return const EdgeInsets.symmetric(horizontal: 24, vertical: 12);
      case ButtonSize.large:
        return const EdgeInsets.symmetric(horizontal: 32, vertical: 16);
    }
  }

  double _getIconSize(ButtonSize size) {
    switch (size) {
      case ButtonSize.small:
        return 16;
      case ButtonSize.medium:
        return 20;
      case ButtonSize.large:
        return 24;
    }
  }

  double _getFontSize(ButtonSize size) {
    switch (size) {
      case ButtonSize.small:
        return 12;
      case ButtonSize.medium:
        return 14;
      case ButtonSize.large:
        return 16;
    }
  }
}

enum ButtonSize { small, medium, large }

class ResponsiveText extends StatelessWidget {
  final String text;
  final TextStyle? style;
  final TextAlign? textAlign;
  final int? maxLines;
  final TextOverflow? overflow;

  const ResponsiveText({
    super.key,
    required this.text,
    this.style,
    this.textAlign,
    this.maxLines,
    this.overflow,
  });

  @override
  Widget build(BuildContext context) {
    final responsiveStyle = _getResponsiveStyle(context, style);
    
    return Text(
      text,
      style: responsiveStyle,
      textAlign: textAlign,
      maxLines: maxLines,
      overflow: overflow ?? TextOverflow.ellipsis,
    );
  }

  TextStyle _getResponsiveStyle(BuildContext context, TextStyle? baseStyle) {
    final baseTextStyle = baseStyle ?? Theme.of(context).textTheme.bodyMedium!;
    
    if (ResponsiveLayout.isMobile(context)) {
      return baseTextStyle.copyWith(fontSize: (baseTextStyle.fontSize ?? 14) * 0.9);
    } else if (ResponsiveLayout.isLargeDesktop(context)) {
      return baseTextStyle.copyWith(fontSize: (baseTextStyle.fontSize ?? 14) * 1.1);
    }
    
    return baseTextStyle;
  }
}

class ResponsiveImage extends StatelessWidget {
  final String imageUrl;
  final double? width;
  final double? height;
  final BoxFit fit;
  final Widget? placeholder;
  final Widget? errorWidget;

  const ResponsiveImage({
    super.key,
    required this.imageUrl,
    this.width,
    this.height,
    this.fit = BoxFit.cover,
    this.placeholder,
    this.errorWidget,
  });

  @override
  Widget build(BuildContext context) {
    return LayoutBuilder(
      builder: (context, constraints) {
        final effectiveWidth = width ?? constraints.maxWidth;
        final effectiveHeight = height;
        
        return Container(
          width: effectiveWidth,
          height: effectiveHeight,
          constraints: BoxConstraints(
            maxWidth: effectiveWidth,
            maxHeight: effectiveHeight ?? double.infinity,
          ),
          child: Image.network(
            imageUrl,
            width: double.infinity,
            height: double.infinity,
            fit: fit,
            loadingBuilder: (context, child, loadingProgress) {
              if (loadingProgress == null) return child;
              return placeholder ?? _buildDefaultPlaceholder();
            },
            errorBuilder: (context, error, stackTrace) {
              return errorWidget ?? _buildDefaultError();
            },
          ),
        );
      },
    );
  }

  Widget _buildDefaultPlaceholder() {
    return Container(
      color: Colors.grey[200],
      child: const Center(
        child: CircularProgressIndicator(),
      ),
    );
  }

  Widget _buildDefaultError() {
    return Container(
      color: Colors.grey[200],
      child: const Center(
        child: Icon(Icons.error_outline, color: Colors.grey),
      ),
    );
  }
}

class ResponsiveAppBar extends StatelessWidget implements PreferredSizeWidget {
  final String title;
  final List<Widget>? actions;
  final Widget? leading;
  final bool automaticallyImplyLeading;
  final Color? backgroundColor;
  final Color? foregroundColor;

  const ResponsiveAppBar({
    super.key,
    required this.title,
    this.actions,
    this.leading,
    this.automaticallyImplyLeading = true,
    this.backgroundColor,
    this.foregroundColor,
  });

  @override
  Widget build(BuildContext context) {
    final isMobile = ResponsiveLayout.isMobile(context);
    final isLandscape = ResponsiveLayout.isLandscape(context);
    
    return AppBar(
      title: Text(
        title,
        style: TextStyle(
          fontSize: isMobile ? 18 : 20,
          fontWeight: FontWeight.w600,
          color: foregroundColor ?? Colors.white,
        ),
      ),
      actions: _buildActions(context),
      leading: leading,
      automaticallyImplyLeading: automaticallyImplyLeading,
      backgroundColor: backgroundColor ?? AppConstants.primaryColor,
      foregroundColor: foregroundColor ?? Colors.white,
      elevation: 0,
      centerTitle: !isMobile || isLandscape,
      titleSpacing: isMobile ? 16 : 24,
    );
  }

  List<Widget>? _buildActions(BuildContext context) {
    if (actions == null) return null;
    
    final isMobile = ResponsiveLayout.isMobile(context);
    
    if (isMobile && actions!.length > 2) {
      // 移动端如果操作按钮太多，显示省略菜单
      return [
        PopupMenuButton<int>(
          icon: const Icon(Icons.more_vert),
          onSelected: (index) {
            // 处理菜单选择
          },
          itemBuilder: (context) {
            return actions!.asMap().entries.map((entry) {
              return PopupMenuItem<int>(
                value: entry.key,
                child: entry.value,
              );
            }).toList();
          },
        ),
      ];
    }
    
    return actions;
  }

  @override
  Size get preferredSize => const Size.fromHeight(kToolbarHeight);
}

class ResponsiveScaffold extends StatelessWidget {
  final Widget body;
  final String? title;
  final Widget? floatingActionButton;
  final Widget? bottomNavigationBar;
  final Widget? drawer;
  final List<Widget>? actions;
  final Widget? leading;
  final bool automaticallyImplyLeading;
  final Color? backgroundColor;

  const ResponsiveScaffold({
    super.key,
    required this.body,
    this.title,
    this.floatingActionButton,
    this.bottomNavigationBar,
    this.drawer,
    this.actions,
    this.leading,
    this.automaticallyImplyLeading = true,
    this.backgroundColor,
  });

  @override
  Widget build(BuildContext context) {
    final isDesktop = ResponsiveLayout.isDesktop(context);
    final isLandscape = ResponsiveLayout.isLandscape(context);
    
    Widget scaffoldBody = ResponsiveContainer(
      child: body,
    );

    // 桌面端或横屏模式添加侧边间距
    if (isDesktop || isLandscape) {
      scaffoldBody = Row(
        children: [
          if (drawer != null && isDesktop) ...[
            SizedBox(
              width: 280,
              child: drawer,
            ),
            const VerticalDivider(width: 1),
          ],
          Expanded(child: scaffoldBody),
          if (isDesktop) const SizedBox(width: 280),
        ],
      );
    }

    return Scaffold(
      appBar: title != null
          ? ResponsiveAppBar(
              title: title!,
              actions: actions,
              leading: leading,
              automaticallyImplyLeading: automaticallyImplyLeading,
            )
          : null,
      body: scaffoldBody,
      floatingActionButton: floatingActionButton,
      bottomNavigationBar: bottomNavigationBar,
      drawer: isDesktop ? null : drawer,
      backgroundColor: backgroundColor,
    );
  }
}