import 'package:flutter/material.dart';
import 'package:tm_app/core/theme/colors.dart';
import 'package:tm_app/core/utils/date_utils.dart';
import 'package:tm_app/core/utils/price_extension.dart';
import 'package:tm_app/core/utils/size_config.dart';
import 'package:tm_app/data/services/model/tender_data/tender_data.dart';
import 'package:tm_app/views/detail/strings/tender_details_strings.dart';
import 'package:tm_app/views/detail/widgets/deadline_item.dart';
import 'package:tm_app/views/detail/widgets/info_item.dart';

// AI-NOTE (for PR reviewer): This widget was rewritten to render ONLY the
// backend-driven fields requested for the tender-details page (notice type,
// form type, languages, issue/publication dates, procedure, value, duration,
// deadlines, buyer org/address, lots, status, ids). Design is unchanged — it
// still uses InfoItem/DeadlineItem. The _infoItem() helper returns an empty
// list when a value is null/blank so empty fields don't render as blank rows
// (this is why each entry is spread with `...`). The old hard-coded
// "Reference Number" row was dropped because it isn't in the requested set.
class TenderDetailInfoSection extends StatelessWidget {
  final bool isScreenBig;
  final TenderData detail;

  const TenderDetailInfoSection({
    required this.isScreenBig,
    required this.detail,
    super.key,
  });

  @override
  Widget build(BuildContext context) {
    final buyer = detail.buyerOrganization;
    final address = buyer?.address;

    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        DeadlineItem(detail: detail, isScreenBig: isScreenBig),
        ..._infoItem(TenderDetailsStrings.noticeTypeCode, detail.noticeTypeCode),
        ..._infoItem(TenderDetailsStrings.formType, detail.formType),
        ..._infoItem(
          TenderDetailsStrings.noticeLanguageCode,
          detail.noticeLanguageCode,
        ),
        ..._infoItem(
          TenderDetailsStrings.issueDate,
          _date(detail.issueDate),
        ),
        ..._infoItem(
          TenderDetailsStrings.issueTime,
          _dateTime(detail.issueTime),
        ),
        ..._infoItem(TenderDetailsStrings.procedureCode, detail.procedureCode),
        ..._infoItem(
          TenderDetailsStrings.estimatedValue,
          detail.estimatedValue == null
              ? null
              : '${detail.estimatedValue?.formattedPrice} ${detail.currency ?? ''}',
        ),
        ..._infoItem(TenderDetailsStrings.durationLabel, _duration()),
        ..._infoItem(
          TenderDetailsStrings.publicationDate,
          _date(detail.publicationDate),
        ),
        ..._infoItem(
          TenderDetailsStrings.tenderDeadlineDate,
          _date(detail.tenderDeadline),
        ),
        ..._infoItem(TenderDetailsStrings.countryCode, detail.countryCode),
        ..._infoItem(TenderDetailsStrings.buyerName, buyer?.name),
        ..._infoItem(TenderDetailsStrings.companyId, buyer?.companyId),
        ..._infoItem(TenderDetailsStrings.buyerCity, address?.cityName),
        ..._infoItem(TenderDetailsStrings.buyerCountry, address?.countryCode),
        ..._infoItem(
          TenderDetailsStrings.officialLanguages,
          (detail.officialLanguages == null ||
                  detail.officialLanguages!.isEmpty)
              ? null
              : detail.officialLanguages!.join(', '),
        ),
        ..._infoItem(TenderDetailsStrings.status, detail.status),
        ..._infoItem(TenderDetailsStrings.tenderId, detail.tenderId),
        ..._lotsSection(),
      ],
    );
  }

  /// Returns an [InfoItem] only when [value] has content, so empty fields are
  /// not rendered as blank rows.
  List<Widget> _infoItem(String title, String? value) {
    if (value == null || value.trim().isEmpty) {
      return const [];
    }
    return [InfoItem(title: title, value: value)];
  }

  List<Widget> _lotsSection() {
    final lots = detail.lots;
    if (lots == null || lots.isEmpty) {
      return const [];
    }

    return [
      SizedBox(height: 8.0.h()),
      Text(
        TenderDetailsStrings.lots,
        style: TextStyle(
          color: AppColors.grey80,
          fontWeight: FontWeight.w600,
          fontSize: 16.0.sp(),
        ),
      ),
      SizedBox(height: 8.0.h()),
      for (final lot in lots) ...[
        ..._infoItem(TenderDetailsStrings.lotId, lot.lotId),
        ..._infoItem('Title', lot.title),
        ..._infoItem('Description', lot.description),
      ],
    ];
  }

  String? _duration() {
    final duration = detail.duration?.trim() ?? '';
    final unit = detail.durationUnit?.trim() ?? '';
    final combined = '$duration $unit'.trim();
    return combined.isEmpty ? null : combined;
  }

  String? _date(int? unix) {
    if (unix == null) {
      return null;
    }
    return timeConvertor(unix);
  }

  String? _dateTime(int? unix) {
    if (unix == null) {
      return null;
    }
    return timeConvertor(unix, hasTime: true);
  }
}