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use enumflags2::BitFlags;

use crate::dds::sampleinfo::*;

// This is used to specify which samples are to be read or taken.
// To be selected, the current state of the sample must be included in the corresponding bitflags.
/// DDS ReadCondition 2.2.2.5.8
#[derive(Debug, Copy, Clone, PartialEq)]
pub struct ReadCondition {
  sample_state_mask: BitFlags<SampleState>,
  view_state_mask: BitFlags<ViewState>,
  instance_state_mask: BitFlags<InstanceState>,
  // Extension idea: Add a query string and a list of query parameters to upgrade this
  // to QueryCondition. But that would be a lot of work, especially in DataReader.
}

impl ReadCondition {
  /// Condition reads all available samples
  pub fn any() -> ReadCondition {
    ReadCondition {
      sample_state_mask: SampleState::any(),
      view_state_mask: ViewState::any(),
      instance_state_mask: InstanceState::any(),
    }
  }

  /// Condition reads samples that are not already read
  pub fn not_read() -> ReadCondition {
    ReadCondition {
      sample_state_mask: SampleState::NotRead.into(),
      view_state_mask: ViewState::any(),
      instance_state_mask: InstanceState::any(),
    }
  }

  pub fn sample_state_mask(&self) -> &BitFlags<SampleState> {
    &self.sample_state_mask
  }

  pub fn view_state_mask(&self) -> &BitFlags<ViewState> {
    &self.view_state_mask
  }

  pub fn instance_state_mask(&self) -> &BitFlags<InstanceState> {
    &self.instance_state_mask
  }
}