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use crate::StripCharacters;

/// Regex-free matcher methods for common use cases
pub trait SimpleMatch {
  /// Starts with a case-insensitive alphanumeric sequence
  fn starts_with_ci(&self, pattern: &str) -> bool;
  
  /// Starts with a case-insensitive alphanumeric sequence
  fn starts_with_ci_alphanum(&self, pattern: &str) -> bool;
  
  /// Ends with a case-insensitive alphanumeric sequence
  fn ends_with_ci(&self, pattern: &str) -> bool;
  
  /// Ends with a case-insensitive alphanumeric sequence
  fn ends_with_ci_alphanum(&self, pattern: &str) -> bool;

  /// Contains a case-insensitive alphanumeric sequence
  fn contains_ci(&self, pattern: &str) -> bool;
  
  /// Contains a case-insensitive alphanumeric sequence
  fn contains_ci_alphanum(&self, pattern: &str) -> bool;
}

impl SimpleMatch for str {
  /// Starts with a case-insensitive sequence
  fn starts_with_ci(&self, pattern: &str) -> bool {
    self.to_lowercase().starts_with(&pattern.to_lowercase())
  }
  
  /// Starts with a case-insensitive alphanumeric sequence
  fn starts_with_ci_alphanum(&self, pattern: &str) -> bool {
    self.to_lowercase().strip_non_alphanum().starts_with(&pattern.to_lowercase())
  }
  
  /// Ends with a case-insensitive sequence
  fn ends_with_ci(&self, pattern: &str) -> bool {
    self.to_lowercase().ends_with(&pattern.to_lowercase())
  }
  
  /// Ends with a case-insensitive alphanumeric sequence
  fn ends_with_ci_alphanum(&self, pattern: &str) -> bool {
    self.to_lowercase().strip_non_alphanum().ends_with(&pattern.to_lowercase())
  }

  /// Contains a case-insensitive sequence
  fn contains_ci(&self, pattern: &str) -> bool {
    self.to_lowercase().contains(&pattern.to_lowercase())
  }
  
  /// Contains a case-insensitive alphanumeric sequence
  fn contains_ci_alphanum(&self, pattern: &str) -> bool {
    self.to_lowercase().strip_non_alphanum().contains(&pattern.to_lowercase())
  }
}


/// Converts arrays or vectors of strs to a vector of owned strings
pub trait ToStrings {
  fn to_strings(&self) -> Vec<String>;
}

impl<T: ToString> ToStrings for Vec<T> {
  /// Converts arrays or vectors of strs to a vector of owned strings
  fn to_strings(&self) -> Vec<String> {
      self.into_iter().map(|s| s.to_string()).collect()
  }
}

impl<T: ToString> ToStrings for [T] {
  /// Converts arrays or vectors of strs to a vector of owned strings
  fn to_strings(&self) -> Vec<String> {
      self.into_iter().map(|s| s.to_string()).collect::<Vec<String>>()
  }
}

/// Return the indices of all ocurrences of a string
pub trait MatchOccurrences {
  /// Return the indices only of all matches of a given string pattern (not a regular expression)
  /// Builds on match_indices in the Rust standard library
  fn find_matched_indices(&self, pat: &str) -> Vec<usize>;
}


impl MatchOccurrences for str {
    /// Return the indices only of all matches of a given regular expression
  fn find_matched_indices(&self, pat: &str) -> Vec<usize> {
    self.match_indices(pat).into_iter().map(|pair| pair.0).collect::<Vec<usize>>()
  }
}