import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

import '../../../core/theme/app_colors.dart';
import '../../../core/widgets/pressable.dart';

/// Four small status dots for the PIN entry.
class PinDots extends StatelessWidget {
  const PinDots({
    super.key,
    required this.length,
    required this.filled,
    this.error = false,
  });

  final int length;
  final int filled;
  final bool error;

  @override
  Widget build(BuildContext context) {
    final colors = context.colors;
    return Row(
      mainAxisSize: MainAxisSize.min,
      children: [
        for (var index = 0; index < length; index++)
          AnimatedContainer(
            duration: const Duration(milliseconds: 140),
            curve: Curves.easeOutCubic,
            width: 16,
            height: 16,
            margin: const EdgeInsets.symmetric(horizontal: 9),
            decoration: BoxDecoration(
              shape: BoxShape.circle,
              color: index < filled
                  ? (error ? colors.danger : colors.accent)
                  : Colors.transparent,
              border: Border.all(
                color: index < filled
                    ? (error ? colors.danger : colors.accent)
                    : colors.inkFaint.withValues(alpha: 0.5),
                width: 1.4,
              ),
            ),
          ),
      ],
    );
  }
}

/// The numeric keypad shared by the lock and PIN setup screens.
class PinKeypad extends StatelessWidget {
  const PinKeypad({
    super.key,
    required this.onDigit,
    required this.onBackspace,
    this.enabled = true,
  });

  final ValueChanged<String> onDigit;
  final VoidCallback onBackspace;
  final bool enabled;

  @override
  Widget build(BuildContext context) {
    const rows = [
      ['1', '2', '3'],
      ['4', '5', '6'],
      ['7', '8', '9'],
    ];

    return AnimatedOpacity(
      duration: const Duration(milliseconds: 140),
      opacity: enabled ? 1 : 0.42,
      child: IgnorePointer(
        ignoring: !enabled,
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            for (final row in rows) ...[
              Row(
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  for (final digit in row) ...[
                    _DigitButton(
                      label: digit,
                      onTap: () {
                        HapticFeedback.selectionClick();
                        onDigit(digit);
                      },
                    ),
                    if (digit != row.last) const SizedBox(width: 16),
                  ],
                ],
              ),
              const SizedBox(height: 14),
            ],
            Row(
              mainAxisAlignment: MainAxisAlignment.center,
              children: [
                const SizedBox(width: 76, height: 68),
                const SizedBox(width: 16),
                _DigitButton(
                  label: '0',
                  onTap: () {
                    HapticFeedback.selectionClick();
                    onDigit('0');
                  },
                ),
                const SizedBox(width: 16),
                _BackspaceButton(
                  onTap: () {
                    HapticFeedback.selectionClick();
                    onBackspace();
                  },
                ),
              ],
            ),
          ],
        ),
      ),
    );
  }
}

class _DigitButton extends StatelessWidget {
  const _DigitButton({required this.label, required this.onTap});

  final String label;
  final VoidCallback onTap;

  @override
  Widget build(BuildContext context) {
    final colors = context.colors;
    return Pressable(
      onTap: onTap,
      semanticLabel: 'Digit $label',
      pressedScale: 0.93,
      child: Container(
        width: 76,
        height: 68,
        alignment: Alignment.center,
        decoration: BoxDecoration(
          color: colors.surface,
          borderRadius: BorderRadius.circular(22),
          border: Border.all(color: colors.border),
        ),
        child: Text(
          label,
          style: Theme.of(context).textTheme.headlineMedium
              ?.copyWith(fontWeight: FontWeight.w500, fontSize: 26),
        ),
      ),
    );
  }
}

class _BackspaceButton extends StatelessWidget {
  const _BackspaceButton({required this.onTap});

  final VoidCallback onTap;

  @override
  Widget build(BuildContext context) {
    final colors = context.colors;
    return Pressable(
      onTap: onTap,
      semanticLabel: 'Delete digit',
      pressedScale: 0.93,
      child: Container(
        width: 76,
        height: 68,
        alignment: Alignment.center,
        decoration: BoxDecoration(
          color: Colors.transparent,
          borderRadius: BorderRadius.circular(22),
          border: Border.all(color: colors.border.withValues(alpha: 0.7)),
        ),
        child: Icon(Icons.backspace_outlined, size: 23, color: colors.inkMuted),
      ),
    );
  }
}

/// The three-by-three dot mark used on the lock screen.
class BrandMark extends StatelessWidget {
  const BrandMark({super.key, this.size = 8, this.gap = 7});

  final double size;
  final double gap;

  @override
  Widget build(BuildContext context) {
    final colors = context.colors;
    return Column(
      mainAxisSize: MainAxisSize.min,
      children: [
        for (var row = 0; row < 3; row++) ...[
          Row(
            mainAxisSize: MainAxisSize.min,
            children: [
              for (var column = 0; column < 3; column++) ...[
                Container(
                  width: size,
                  height: size,
                  decoration: BoxDecoration(
                    color: colors.accent,
                    shape: BoxShape.circle,
                  ),
                ),
                if (column < 2) SizedBox(width: gap),
              ],
            ],
          ),
          if (row < 2) SizedBox(height: gap),
        ],
      ],
    );
  }
}