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

import '../../../common/extension/extension.dart';
import '../../../common/theme/theme.dart';
import '../../../common/ui/painter/dashed_line_painter.dart';
import '../../../domain/wallet/wallet.dart';
import '../../components/toast/flushbar.dart';
import '../wallet/wallet_ui.dart';

/// Label jenis voucher (§9.1).
String voucherTypeLabel(VoucherType type, int faceValue) => switch (type) {
  VoucherType.fixedValue => 'Potongan ${faceValue.currencyFormatRp}',
  VoucherType.percentage => 'Potongan persen',
  VoucherType.freeItem => 'Gratis item',
  VoucherType.merchantBenefit => 'Benefit merchant',
  VoucherType.unknown => 'Voucher',
};

/// "senilai Rp 20.000". `null` untuk potongan nominal, karena nilainya sudah
/// ada di [voucherTypeLabel], dan bila server tidak mengirim nilai.
String? voucherFaceValueLabel(VoucherType type, int faceValue) =>
    type == VoucherType.fixedValue || faceValue <= 0
    ? null
    : 'senilai ${faceValue.currencyFormatRp}';

extension VoucherRedemptionStatusUi on VoucherRedemptionStatus {
  String get label => switch (this) {
    VoucherRedemptionStatus.completed => 'Siap dipakai',
    VoucherRedemptionStatus.pending => 'Sedang diproses',
    VoucherRedemptionStatus.failed => 'Gagal',
    VoucherRedemptionStatus.unknown => '',
  };

  Color get color => switch (this) {
    VoucherRedemptionStatus.completed => AppColor.success,
    VoucherRedemptionStatus.pending => AppColor.warning,
    VoucherRedemptionStatus.failed => AppColor.error,
    VoucherRedemptionStatus.unknown => AppColor.textSecondary,
  };
}

class VoucherRedemptionStatusBadge extends StatelessWidget {
  const VoucherRedemptionStatusBadge({super.key, required this.status});

  final VoucherRedemptionStatus status;

  @override
  Widget build(BuildContext context) {
    return Container(
      padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 3),
      decoration: BoxDecoration(
        color: status.color.withOpacity(0.1),
        borderRadius: BorderRadius.circular(20),
      ),
      child: Text(
        status.label,
        style: AppStyle.xs.copyWith(
          color: status.color,
          fontWeight: FontWeight.w700,
        ),
      ),
    );
  }
}

/// Pesan untuk penolakan tukar voucher (§9.2). `cause` dari server berbahasa
/// Inggris dan tidak ditampilkan mentah. [reloadCatalog] menandai voucher yang
/// sudah tidak tersedia, sehingga katalog perlu dimuat ulang.
({String message, bool reloadCatalog}) describeVoucherRedeemFailure(
  WalletFailure failure,
) {
  final cause = failure.maybeMap(
    rejected: (value) => value.cause.toLowerCase(),
    orElse: () => null,
  );
  if (cause == null) {
    return (message: walletFailureMessage(failure), reloadCatalog: false);
  }

  if (cause.contains('not enough enakpoint')) {
    return (message: 'EnakPoint kamu kurang.', reloadCatalog: false);
  }
  if (cause.contains('out of stock')) {
    return (message: 'Voucher sudah habis.', reloadCatalog: true);
  }
  if (cause.contains('per customer')) {
    return (
      message: 'Kamu sudah mencapai batas penukaran voucher ini.',
      reloadCatalog: false,
    );
  }
  if (cause.contains('customer is not active')) {
    return (message: 'Akun tidak aktif.', reloadCatalog: false);
  }
  if (cause.contains('not available') ||
      cause.contains('cannot be redeemed yet') ||
      cause.contains('has ended')) {
    return (message: 'Voucher tidak tersedia.', reloadCatalog: true);
  }
  // Termasuk Idempotency-Key yang terpakai untuk voucher lain (bug di app).
  return (
    message: 'Penukaran voucher tidak bisa diproses.',
    reloadCatalog: false,
  );
}

/// Gambar voucher dari `image_url`; ikon tiket bila kosong.
class VoucherImage extends StatelessWidget {
  const VoucherImage({
    super.key,
    required this.url,
    required this.size,
    this.dimmed = false,
  });

  final String? url;
  final double size;

  /// Abu-abu untuk voucher yang tidak bisa ditukar / dipakai.
  final bool dimmed;

  static const ColorFilter _greyscale = ColorFilter.matrix([
    0.2126, 0.7152, 0.0722, 0, 0, //
    0.2126, 0.7152, 0.0722, 0, 0, //
    0.2126, 0.7152, 0.0722, 0, 0, //
    0, 0, 0, 0.5, 0, //
  ]);

  @override
  Widget build(BuildContext context) {
    final fallback = SizedBox(
      width: size,
      height: size,
      child: Icon(
        Icons.confirmation_number_outlined,
        size: size * 0.7,
        color: dimmed ? AppColor.textLight : AppColor.primary,
      ),
    );

    final image = url == null
        ? fallback
        : ClipRRect(
            borderRadius: BorderRadius.circular(8),
            child: CachedNetworkImage(
              imageUrl: url!,
              width: size,
              height: size,
              fit: BoxFit.cover,
              placeholder: (_, _) => SizedBox(width: size, height: size),
              errorWidget: (_, _, _) => fallback,
            ),
          );

    if (!dimmed || url == null) return image;
    return ColorFiltered(colorFilter: _greyscale, child: image);
  }
}

/// Kode voucher yang bisa disalin. Customer menunjukkan layar ini ke kasir.
class VoucherCodeBox extends StatelessWidget {
  const VoucherCodeBox({super.key, required this.code});

  final String code;

  Future<void> _copy(BuildContext context) async {
    await Clipboard.setData(ClipboardData(text: code));
    if (!context.mounted) return;
    AppFlushbar.showSuccess(context, 'Kode voucher disalin');
  }

  @override
  Widget build(BuildContext context) {
    return Container(
      padding: const EdgeInsets.fromLTRB(16, 14, 8, 8),
      decoration: BoxDecoration(
        border: Border.all(color: AppColor.border),
        borderRadius: BorderRadius.circular(16),
      ),
      child: Column(
        children: [
          Text(
            'Tunjukkan kode ini ke kasir',
            style: AppStyle.sm.copyWith(color: AppColor.textSecondary),
          ),
          const SizedBox(height: 10),
          CustomPaint(
            size: const Size(double.infinity, 1),
            painter: DashedLinePainter(),
          ),
          const SizedBox(height: 4),
          Row(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              Flexible(
                child: SelectableText(
                  code,
                  textAlign: TextAlign.center,
                  style: AppStyle.xl.copyWith(
                    fontWeight: FontWeight.w700,
                    letterSpacing: 2,
                  ),
                ),
              ),
              IconButton(
                onPressed: () => _copy(context),
                tooltip: 'Salin kode',
                icon: const Icon(
                  Icons.copy_rounded,
                  size: 20,
                  color: AppColor.primary,
                ),
              ),
            ],
          ),
        ],
      ),
    );
  }
}

/// Catatan untuk voucher tanpa kode (`code` null): customer menunjukkan layar
/// voucher ke kasir.
class VoucherNoCodeNote extends StatelessWidget {
  const VoucherNoCodeNote({super.key});

  @override
  Widget build(BuildContext context) {
    return Container(
      padding: const EdgeInsets.all(14),
      decoration: BoxDecoration(
        color: AppColor.successWithOpacity(0.08),
        borderRadius: BorderRadius.circular(AppValue.borderRadius),
      ),
      child: Row(
        children: [
          const Icon(
            Icons.storefront_outlined,
            size: 20,
            color: AppColor.success,
          ),
          const SizedBox(width: 10),
          Expanded(
            child: Text(
              'Voucher ini tidak memakai kode. Tunjukkan layar ini ke kasir.',
              style: AppStyle.sm,
            ),
          ),
        ],
      ),
    );
  }
}