import 'package:miaoji_zhang/shared/services/screenshot_channel.dart';

class RecognitionDiagnosticDisplay {
  final String stageLabel;
  final String resultLabel;
  final String summaryLabel;
  final String reasonLabel;
  final String? recognitionKindLabel;
  final String? amountSourceLabel;
  final String? statusStrengthLabel;
  final bool statusStrengthPositive;

  const RecognitionDiagnosticDisplay({
    required this.stageLabel,
    required this.resultLabel,
    required this.summaryLabel,
    required this.reasonLabel,
    this.recognitionKindLabel,
    this.amountSourceLabel,
    this.statusStrengthLabel,
    this.statusStrengthPositive = false,
  });

  factory RecognitionDiagnosticDisplay.from(RecognitionDiagnostic diagnostic) {
    final reason = diagnostic.reason;
    return RecognitionDiagnosticDisplay(
      stageLabel: _stageLabel(diagnostic.stage),
      resultLabel: _resultLabel(diagnostic.result),
      summaryLabel: _summaryLabel(diagnostic.result, reason),
      reasonLabel: _reasonLabel(reason),
      recognitionKindLabel: _recognitionKindLabel(diagnostic.recognitionKind),
      amountSourceLabel: _amountSourceLabel(diagnostic.amountSource),
      statusStrengthLabel: _statusStrengthLabel(diagnostic.statusStrength),
      statusStrengthPositive: diagnostic.statusStrength == 'strong',
    );
  }

  static String _stageLabel(String value) {
    return switch (value) {
      'capture' => '本地截屏',
      'ocr' => '本地 OCR',
      'tree' => '控件树识别',
      _ => '无障碍事件',
    };
  }

  static String _resultLabel(String value) {
    return switch (value) {
      'matched' || 'auto_ready' => '已识别',
      'confirm' => '待确认',
      'started' => '处理中',
      'failed' => '失败',
      _ => '未触发入账',
    };
  }

  static String _summaryLabel(String result, String reason) {
    if (reason == 'duplicate_result_surface') return '已合并';
    if (_captureFailureReasons.contains(reason)) return '截图失败';
    if (_ocrNoResultReasons.contains(reason)) return 'OCR 无结果';
    if (_ruleRejectedReasons.contains(reason) || result == 'rejected') {
      return '规则拒绝';
    }
    return switch (result) {
      'matched' || 'auto_ready' => '已识别',
      'confirm' => '待确认',
      'started' => '处理中',
      'failed' => '失败',
      _ => '没事件',
    };
  }

  static String _reasonLabel(String reason) {
    return switch (reason) {
      'history_page' => '当前是账单或交易历史页',
      'blocked_status' => '当前状态为失败、处理中或已取消',
      'no_text' => '截图中没有识别到文字',
      'no_success_status' => '没有找到明确或弱完成状态，可开启诊断预览查看脱敏结果',
      'payment_input_page' => '当前仍是付款输入或确认页面，已拒绝入账',
      'direction_unknown' => '识别到完成状态，但无法确认收支方向',
      'missing_amount' => '成功状态已识别，但没有找到金额',
      'expected_amount_missing' => '结果页没有金额，且付款前金额不唯一或未捕获',
      'expected_amount_fallback' => '结果页未读到金额，已使用本次付款流程确认的金额',
      'weak_expected_fallback' => '结果页未读到金额，付款前金额来源不可靠，请确认后入账',
      'result_amount_conflict' => '结果页金额与本次付款金额不一致，请确认后入账',
      'amount_source_untrusted' => '金额无法与当前付款流程可靠关联，请确认后入账',
      'red_packet_not_settled' => '红包尚未明确到账或退回，不会自动入账',
      'duplicate_result_surface' => '同一结果页已处理，本次刷新已忽略',
      'weak_status_confirm' => '只识别到弱完成状态，组合证据不足，需确认后入账',
      'combined_high_confidence' => '弱完成状态已通过流程、跳转和金额组合校验',
      'ambiguous_or_unarmed' => '金额存在歧义或未捕获到完整支付流程',
      'secure_window' => '当前页面被系统禁止截屏',
      'window_fallback' => '单窗口截图失败，正在切换整屏截图',
      'invalid_window' => '支付页面窗口已切换，单窗口截图已失效',
      'internal_error' => '系统单窗口截图失败，请停留在成功页重试',
      'display_capture_start_failed' => '整屏截图请求无法启动',
      'invalid_display' => '当前屏幕暂时无法截取',
      'capture_timeout' => '系统截屏长时间没有返回结果，已自动结束',
      'capture_start_failed' => '系统截屏请求无法启动',
      'ocr_timeout' => '本地 OCR 超时，已自动结束，可在支付成功页重试',
      'ocr_start_failed' => '本地 OCR 请求无法启动',
      'ocr_init_failed' => '本地 OCR 组件初始化失败，请重新开启无障碍服务',
      'ocr_model_unavailable' => '本地中文识别模型不可用，请重新安装内测包',
      'ocr_unavailable' => '本地 OCR 服务暂不可用，请稍后重试',
      'ocr_failed' => '本地 OCR 识别失败，请停留在支付成功页重试',
      'ocr_parse_failed' => '本地 OCR 结果处理失败',
      'operation_interrupted' => '识别进程曾被系统中断，任务已自动结束',
      'interval_short' => '系统限制了过于频繁的截屏',
      'accessibility_unavailable' => '无障碍截屏能力暂不可用',
      'image_encode_failed' => '截图结果编码失败，请重试',
      'success' || 'high_confidence' => '成功状态和金额均已确认',
      _ => reason.isEmpty ? '等待新的支付事件' : reason,
    };
  }

  static String? _recognitionKindLabel(String? value) {
    return switch (value) {
      'payment' => '扫码支付',
      'transfer' => '转账',
      'red_packet_send' => '发出红包',
      'red_packet_receive' => '红包到账',
      'red_packet_refund' => '红包退回',
      _ => null,
    };
  }

  static String? _amountSourceLabel(String? value) {
    return switch (value) {
      'expected' => '使用本次付款金额',
      'result' => '使用结果页金额',
      _ => null,
    };
  }

  static String? _statusStrengthLabel(String value) {
    return switch (value) {
      'strong' => '明确成功状态',
      'weak' => '弱完成状态',
      _ => null,
    };
  }

  static const _captureFailureReasons = {
    'secure_window',
    'invalid_window',
    'internal_error',
    'display_capture_start_failed',
    'invalid_display',
    'capture_timeout',
    'capture_start_failed',
    'interval_short',
    'accessibility_unavailable',
    'image_encode_failed',
  };

  static const _ocrNoResultReasons = {
    'no_text',
    'ocr_timeout',
    'ocr_start_failed',
    'ocr_init_failed',
    'ocr_model_unavailable',
    'ocr_unavailable',
    'ocr_failed',
    'ocr_parse_failed',
  };

  static const _ruleRejectedReasons = {
    'history_page',
    'blocked_status',
    'no_success_status',
    'payment_input_page',
    'direction_unknown',
    'missing_amount',
    'expected_amount_missing',
    'red_packet_not_settled',
    'weak_status_confirm',
    'ambiguous_or_unarmed',
    'weak_expected_fallback',
    'result_amount_conflict',
    'amount_source_untrusted',
  };
}