use super::*;

//use crate::icalwrap::IcalVEvent;
use crate::khevent::KhEvent;

pub struct GrepFilter {
  terms: Vec<String>,
}

impl SelectFilter for GrepFilter {
  fn add_term(&mut self, it: &mut dyn Iterator<Item = &&str>) {
    let term = it.next().unwrap();
    self.terms.push(term.to_lowercase());
  }

  fn is_not_empty(&self) -> bool {
    !self.terms.is_empty()
  }

  fn includes(&self, event: &KhEvent) -> bool {
    for term in &self.terms {
      if let Some(summary) = event.get_summary() {
        if summary.to_lowercase().contains(term) {
          return true;
        }
      }
      if let Some(description) = event.get_description() {
        if description.to_lowercase().contains(term) {
          return true;
        }
      }
      if let Some(location) = event.get_location() {
        if location.to_lowercase().contains(term) {
          return true;
        }
      }
    }
    false
  }
}

impl Default for GrepFilter {
  fn default() -> GrepFilter {
    GrepFilter { terms: Vec::new() }
  }
}

#[cfg(test)]
mod tests {
  use super::test::test_filter_event;
  use crate::testdata;

  #[test]
  fn test_grep() {
    let filtered = test_filter_event(
      &testdata::TEST_EVENT_MULTIDAY,
      None,
      &["grep", "International"],
    );
    assert_eq!(true, filtered);
  }

  #[test]
  fn test_grep_location() {
    let filtered = test_filter_event(&testdata::TEST_EVENT_MULTIDAY, None, &["grep", "Lobby"]);
    assert_eq!(true, filtered);
  }

  #[test]
  fn test_grep_description() {
    let filtered = test_filter_event(
      &testdata::TEST_EVENT_ONE_MEETING,
      None,
      &["grep", "interoperability"],
    );
    assert_eq!(true, filtered);
  }

  #[test]
  fn test_grep_case() {
    let filtered = test_filter_event(
      &testdata::TEST_EVENT_MULTIDAY,
      None,
      &["grep", "InTeRnAtIOnAl"],
    );
    assert_eq!(true, filtered);
  }

  #[test]
  fn test_grep_negative() {
    let filtered = test_filter_event(
      &testdata::TEST_EVENT_MULTIDAY,
      None,
      &["grep", "nonexistent term"],
    );
    assert_eq!(false, filtered);
  }
}