import 'package:flutter/material.dart';

import '../core/app_colors.dart';
import '../core/app_design_tokens.dart';

enum AppButtonVariant { primary, secondary, outline, ghost, danger, gradientOutline }

class AppButton extends StatelessWidget {
  final String label;
  final VoidCallback? onPressed;
  final IconData? icon;
  final AppButtonVariant variant;
  final Color? color;
  final LinearGradient? gradient;
  final bool loading;
  final double height;
  final bool expand;

  const AppButton({
    super.key,
    required this.label,
    this.onPressed,
    this.icon,
    this.variant = AppButtonVariant.primary,
    this.color,
    this.gradient,
    this.loading = false,
    this.height = 50,
    this.expand = true,
  });

  @override
  Widget build(BuildContext context) {
    final enabled = onPressed != null && !loading;
    final baseColor = color ?? AppColors.primary;
    final child = _ButtonContent(
      label: label,
      icon: icon,
      loading: loading,
      foreground: _foreground(baseColor),
    );

    if (variant == AppButtonVariant.gradientOutline) {
      return _GradientOutlineButton(
        label: label,
        icon: icon,
        loading: loading,
        enabled: enabled,
        height: height,
        expand: expand,
        gradient: gradient ?? AppColors.actionOutlineGradient,
        onPressed: onPressed,
      );
    }

    final decoration = _decoration(baseColor, enabled);
    final width = expand ? double.infinity : null;
    return SizedBox(
      height: height,
      width: width,
      child: Material(
        color: Colors.transparent,
        child: InkWell(
          onTap: enabled ? onPressed : null,
          borderRadius: AppRadius.lgBorder,
          child: Ink(
            decoration: decoration,
            child: Center(child: child),
          ),
        ),
      ),
    );
  }

  Color _foreground(Color baseColor) {
    return switch (variant) {
      AppButtonVariant.primary => Colors.white,
      AppButtonVariant.secondary => baseColor,
      AppButtonVariant.outline => baseColor,
      AppButtonVariant.ghost => baseColor,
      AppButtonVariant.danger => variant == AppButtonVariant.danger && color == null
          ? AppColors.error
          : Colors.white,
      AppButtonVariant.gradientOutline => AppColors.textPrimary,
    };
  }

  BoxDecoration _decoration(Color baseColor, bool enabled) {
    final disabledColor = const Color(0xFFE5E7EB);
    return switch (variant) {
      AppButtonVariant.primary => BoxDecoration(
        color: enabled ? baseColor : disabledColor,
        borderRadius: AppRadius.lgBorder,
        boxShadow: enabled ? AppShadows.soft : AppShadows.none,
      ),
      AppButtonVariant.secondary => BoxDecoration(
        color: enabled ? baseColor.withValues(alpha: 0.10) : disabledColor,
        borderRadius: AppRadius.lgBorder,
      ),
      AppButtonVariant.outline => BoxDecoration(
        color: Colors.white,
        borderRadius: AppRadius.lgBorder,
        border: Border.all(color: enabled ? baseColor.withValues(alpha: 0.38) : disabledColor),
      ),
      AppButtonVariant.ghost => BoxDecoration(
        color: enabled ? baseColor.withValues(alpha: 0.08) : disabledColor,
        borderRadius: AppRadius.lgBorder,
      ),
      AppButtonVariant.danger => BoxDecoration(
        color: enabled ? (color ?? AppColors.error) : disabledColor,
        borderRadius: AppRadius.lgBorder,
      ),
      AppButtonVariant.gradientOutline => const BoxDecoration(),
    };
  }
}

class _ButtonContent extends StatelessWidget {
  final String label;
  final IconData? icon;
  final bool loading;
  final Color foreground;

  const _ButtonContent({
    required this.label,
    required this.icon,
    required this.loading,
    required this.foreground,
  });

  @override
  Widget build(BuildContext context) {
    return Row(
      mainAxisAlignment: MainAxisAlignment.center,
      mainAxisSize: MainAxisSize.min,
      children: [
        if (loading)
          SizedBox(
            width: 18,
            height: 18,
            child: CircularProgressIndicator(strokeWidth: 2, color: foreground),
          )
        else if (icon != null)
          Icon(icon, size: 19, color: foreground),
        if (loading || icon != null) const SizedBox(width: 8),
        Flexible(
          child: Text(
            label,
            maxLines: 1,
            overflow: TextOverflow.ellipsis,
            style: AppTextStyles.button.copyWith(color: foreground),
          ),
        ),
      ],
    );
  }
}

class _GradientOutlineButton extends StatelessWidget {
  final String label;
  final IconData? icon;
  final bool loading;
  final bool enabled;
  final double height;
  final bool expand;
  final LinearGradient gradient;
  final VoidCallback? onPressed;

  const _GradientOutlineButton({
    required this.label,
    required this.icon,
    required this.loading,
    required this.enabled,
    required this.height,
    required this.expand,
    required this.gradient,
    required this.onPressed,
  });

  @override
  Widget build(BuildContext context) {
    return Container(
      height: height,
      width: expand ? double.infinity : null,
      padding: const EdgeInsets.all(1.5),
      decoration: BoxDecoration(
        gradient: enabled ? gradient : null,
        color: enabled ? null : AppColors.borderLight,
        borderRadius: AppRadius.lgBorder,
        boxShadow: enabled ? AppShadows.soft : AppShadows.none,
      ),
      child: Material(
        color: Colors.white,
        borderRadius: BorderRadius.circular(AppRadius.lg - 1.5),
        child: InkWell(
          onTap: enabled ? onPressed : null,
          borderRadius: BorderRadius.circular(AppRadius.lg - 1.5),
          child: Center(
            child: _ButtonContent(
              label: label,
              icon: icon,
              loading: loading,
              foreground: AppColors.textPrimary,
            ),
          ),
        ),
      ),
    );
  }
}

class AppIconTile extends StatelessWidget {
  final IconData icon;
  final Color color;
  final Color backgroundColor;
  final double size;
  final double iconSize;
  final BorderRadius? borderRadius;

  const AppIconTile({
    super.key,
    required this.icon,
    required this.color,
    required this.backgroundColor,
    this.size = 44,
    this.iconSize = 22,
    this.borderRadius,
  });

  @override
  Widget build(BuildContext context) => Container(
    width: size,
    height: size,
    decoration: BoxDecoration(
      color: backgroundColor,
      borderRadius: borderRadius ?? AppRadius.mdBorder,
      border: Border.all(color: color.withValues(alpha: 0.16)),
    ),
    child: Icon(icon, size: iconSize, color: color),
  );
}