Major refactor

crates/siren-core/src/utils/text_utils.rs

@@ -0,0 +1,62 @@
+pub fn a_or_an(word: &str) -> &'static str {
+  let vowels = ['a', 'e', 'i', 'o', 'u'];
+  let lowercase_word = word.to_lowercase();
+
+  // Special cases where the article should be "a"
+  let special_cases_a = vec!["one"];
+  if special_cases_a.contains(&lowercase_word.as_str()) {
+    return "a";
+  }
+
+  // Special cases where the article should be "an"
+  let special_cases_an = vec!["hour"];
+  if special_cases_an.contains(&lowercase_word.as_str()) {
+    return "an";
+  }
+
+  let first_char = lowercase_word.chars().next();
+
+  match first_char {
+    // If the first character is a vowel, return "an"
+    Some(c) if vowels.contains(&c) => "an",
+    // Otherwise, return "a"
+    _ => "a",
+  }
+}
+
+pub fn number_to_words(n: i32) -> String {
+  let ones = [
+    "", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine",
+  ];
+  let teens = [
+    "ten",
+    "eleven",
+    "twelve",
+    "thirteen",
+    "fourteen",
+    "fifteen",
+    "sixteen",
+    "seventeen",
+    "eighteen",
+    "nineteen",
+  ];
+  let tens = [
+    "", "", "twenty", "thirty", "forty", "fifty", "sixty", "seventy", "eighty", "ninety",
+  ];
+
+  if n < 10 {
+    ones[n as usize].to_string()
+  } else if n < 20 {
+    teens[(n - 10) as usize].to_string()
+  } else if n < 100 {
+    let ten_part = tens[(n / 10) as usize];
+    let one_part = ones[(n % 10) as usize];
+    if n % 10 == 0 {
+      ten_part.to_string() // e.g., 20 → "twenty"
+    } else {
+      format!("{}-{}", ten_part, one_part) // e.g., 42 → "forty-two"
+    }
+  } else {
+    "Number out of range".to_string() // Handle numbers >= 100 (or extend the logic)
+  }
+}