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//! Returns the index of `search` in `subject`.

use regex::Regex;
/// Returns an array of all occurrence index of `search` in `subject` or an empty array if not found. Case sensitive.
///
/// # Arguments
///
/// * `subject` - The string where to search.
/// * `search` - The string to search.
/// * `from_index` - The index to start searching
///
/// # Example
/// ```
/// use voca_rs::*;
/// index::index_all("morning", "n", 0);
/// // => [3, 5]
/// index::index_all("Zażółć gęślą jaźń", "aęą", 0);
/// // => [1, 8, 11, 14]
/// index::index_all("evening", "o", 0);
/// // => []
/// use voca_rs::Voca;
/// "morning"._index_all("n", 0);
/// // => [3, 5]
/// ```
pub fn index_all(subject: &str, search: &str, from_index: usize) -> Vec<usize> {
    if subject.is_empty() || crate::count::count(&subject) < from_index {
        return vec![];
    }
    let string_slice = &subject[subject.char_indices().nth(from_index).unwrap().0..];
    let mut res = Vec::new();
    for (i, c) in crate::split::chars(string_slice).iter().enumerate() {
        if search.contains(c) {
            res.push(i)
        }
    }
    res
}

/// Returns the first occurrence index of `search` in `subject` or -1 if not found. Case sensitive.
///
/// # Arguments
///
/// * `subject` - The string where to search.
/// * `search` - The string to search.
/// * `from_index` - The index to start searching
///
/// # Example
/// ```
/// use voca_rs::*;
/// index::index_of("morning", "n", 0);
/// // => 3
/// index::index_of("Zażółć gęślą jaźń", "gęślą", 0);
/// // => 7
/// index::index_of("evening", "o", 0);
/// // => -1
/// use voca_rs::Voca;
/// "morning"._index_of("n", 0);
/// // => 3
/// ```
pub fn index_of(subject: &str, search: &str, from_index: usize) -> i8 {
    match search.len() {
        0 => 0,
        _ => {
            if crate::count::count(&subject) < from_index {
                return -1;
            }
            let string_slice = &subject[subject.char_indices().nth(from_index).unwrap().0..];
            match crate::split::chars(string_slice)
                .iter()
                .enumerate()
                .position(|(pos, _)| {
                    match &string_slice[string_slice.char_indices().nth(pos).unwrap().0..]
                        .find(search)
                    {
                        Some(x) => *x == 0,
                        None => false,
                    }
                }) {
                Some(x) => x as i8,
                None => -1,
            }
        }
    }
}

/// Returns the last occurrence index of `search` in `subject` or -1 if not found. Case sensitive.
///
/// # Arguments
///
/// * `subject` - The string where to search.
/// * `search` - The string to search.
/// * `from_index` - The index to start searching
///
/// # Example
/// ```
/// use voca_rs::*;
/// index::last_index_of("morning", "n", 0);
/// // => 5
/// index::last_index_of("evening", "o", 0);
/// // => -1
/// use voca_rs::Voca;
/// "morning"._last_index_of("n", 0);
/// // => 5
/// ```
pub fn last_index_of(subject: &str, search: &str, from_index: usize) -> i8 {
    match search.len() {
        0 => 0,
        _ => {
            if crate::count::count(&subject) < from_index {
                return -1;
            }
            let string_slice = &subject[subject.char_indices().nth(from_index).unwrap().0..];
            let string_chars = crate::split::chars(string_slice);
            match string_chars.iter().enumerate().rev().position(|(pos, _)| {
                match &string_slice[string_slice.char_indices().nth(pos).unwrap().0..].find(search)
                {
                    Some(x) => *x == 0,
                    None => false,
                }
            }) {
                Some(x) => (string_chars.len() - x - 1) as i8,
                None => -1,
            }
        }
    }
}

/// Returns the first index of a `pattern` match in `subject`.
/// NOTE: Executes regular expressions only on valid UTF-8 while exposing match locations as byte indices into the search string (see case #3).
///
/// # Arguments
///
/// * `subject` - The string where to search.
/// * `pattern` - The RegExp pattern to search, it is transformed to Regex::new(pattern).
/// * `from_index` - The index to start searching.
///
/// # Example
/// ```
/// use voca_rs::*;
/// index::search("morning", "rn", 0);
/// // => 2
/// index::search("evening", r"\d", 0);
/// // => -1
/// index::search("Zażółć gęślą jaźń", "gęślą", 6);
/// // => 11 (substring's position in `subject`), not 7
/// use voca_rs::Voca;
/// "morning"._search("rn", 0);
/// // => 2
/// ```
pub fn search(subject: &str, pattern: &str, from_index: usize) -> i8 {
    if from_index >= crate::split::chars(&subject).len() {
        return -1;
    }
    match pattern.len() {
        0 => 0,
        _ => {
            let re: Regex = match Regex::new(pattern) {
                Ok(re) => re,
                Err(_) => return -1,
            };
            match re.find_at(&subject, from_index) {
                None => -1,
                Some(x) => x.start() as i8,
            }
        }
    }
}