// TODO these functions are so shit
/// Finds the index of the first occurrence of `search_bytes` in `bytes`.
fn find_pattern(bytes: &[u8], search_bytes: &[u8]) -> Option<usize> 
{
    bytes.windows(search_bytes.len())
        .position(|window| window == search_bytes)
}
/// Finds the closing brace of the opening brace passed as a param
fn find_closing_brace(bytes: &[u8], opening_brace_index: usize) -> Option<usize>
{
    let mut depth: i8 = 0;
    for (i, _) in bytes.iter().enumerate().take(bytes.len()-1).skip(opening_brace_index)
    {
        if bytes[i] == 5 { 
            depth += 1; }
        else if bytes[i] == 6 
        {
            depth -= 1;
            if depth == 0 { return Some(i) }
        }
        //println!("{}\t{}", bytes[i], depth);
    }
    None
}
/// Searches the bytes for a particular page
pub fn get_page(bytes: &[u8], page: &str) -> Vec<u8>
{
    let mut page_bytes: Vec<u8> = vec![1];
    let search_pages_bytes: Vec<u8> = vec![3, 112, 97, 103, 101, 115, 4];
    let mut search_bytes: Vec<u8> = vec![3];
    search_bytes.append(&mut page.as_bytes().to_vec());
    search_bytes.push(4);

    if let Some(opening_index) = find_pattern(bytes, &search_pages_bytes)
    && let Some(closing_index) = find_closing_brace(bytes, opening_index+search_pages_bytes.len())
    { // TODO ignore when in quotes or name
        //println!("found pages: {} to {}", opening_index, closing_index);
        if let Some(opening_page_index) = find_pattern(&bytes[opening_index..=closing_index], &search_bytes)
        {
            //println!("{:?}", &bytes[opening_index+opening_page_index..]);
            if let Some(closing_page_index) = find_closing_brace
            (
                &bytes[opening_index+opening_page_index..],
                search_bytes.len()
            )
            {
                page_bytes.append(&mut bytes[opening_page_index+opening_index..=opening_page_index+closing_page_index+opening_index].to_vec());
                page_bytes.push(2);
                return page_bytes
            }
        }
    }
    page_bytes.push(10); // Page not found error message
    page_bytes.push(2);
    page_bytes
}