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//! Utility functions.

use serde::{Deserialize, Deserializer, Serializer};
use sp_std::{str, vec::Vec};

/// The Skynet URI protocol prefix.
pub const URI_SKYNET_PREFIX: &str = "sia://";

pub fn concat_bytes(byte_slices: &[&[u8]]) -> Vec<u8> {
    let mut len = 0;
    for bytes in byte_slices {
        len += bytes.len();
    }
    let mut final_bytes = Vec::with_capacity(len);

    for bytes in byte_slices {
        let mut v = bytes.to_vec();
        final_bytes.append(&mut v);
    }

    final_bytes
}

pub fn concat_strs(strs: &[&str]) -> Vec<u8> {
    let mut len = 0;
    for s in strs {
        len += s.len();
    }
    let mut str_bytes = Vec::with_capacity(len);

    for s in strs {
        let mut v = str_to_bytes(s);
        str_bytes.append(&mut v);
    }

    str_bytes
}

pub fn format_skylink(skylink: &[u8]) -> Vec<u8> {
    concat_bytes(&[&str_to_bytes(URI_SKYNET_PREFIX), skylink])
}

pub fn make_url(strs: &[&str]) -> Vec<u8> {
    let mut len = 0;
    for s in strs {
        len += s.len();

        // Add 1 for every slash that will be added to the URL later.
        if !s.ends_with('/') {
            len += 1;
        }
    }
    let mut url_bytes = Vec::with_capacity(len);

    let mut i = 0;
    for s in strs {
        // Remove any slashes from the beginning.
        let mut j = 0;
        while s[j..].starts_with('/') {
            j += 1;
        }
        let trimmed_s = &s[j..];

        if trimmed_s.is_empty() {
            i += 1;
            continue;
        }

        // Append the URL component to the URL.
        let mut v = str_to_bytes(trimmed_s);
        url_bytes.append(&mut v);

        // If this is not the last url component and there is no trailing slash, add one.
        if i < strs.len() - 1 && !trimmed_s.ends_with('/') {
            let mut slash = str_to_bytes("/");
            url_bytes.append(&mut slash);
        }

        i += 1;
    }

    url_bytes
}

pub fn str_to_bytes(s: &str) -> Vec<u8> {
    s.as_bytes().to_vec()
}

pub fn trim_prefix<'a>(s: &'a str, prefix: &str) -> &'a str {
    let mut i = 0;

    loop {
        if i >= prefix.len() {
            return &s[i..];
        } else if i >= s.len() || s.chars().nth(i) != prefix.chars().nth(i) {
            return s;
        }

        i += 1;
    }
}

pub fn de_string_to_bytes<'de, D>(de: D) -> Result<Vec<u8>, D::Error>
where
    D: Deserializer<'de>,
{
    let s: &str = Deserialize::deserialize(de)?;
    Ok(s.as_bytes().to_vec())
}

pub fn ser_bytes_to_string<S>(v: &[u8], s: S) -> Result<S::Ok, S::Error>
where
    S: Serializer,
{
    s.serialize_str(str::from_utf8(v).unwrap())
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::request::DEFAULT_PORTAL_URL;

    use sp_std::str;

    #[test]
    fn make_url_test() {
        const ENTRY_LINK: &str = "AQAZ1R-KcL4NO_xIVf0q8B1ngPVd6ec-Pu54O0Cto387Nw";
        const EXPECTED_URL: &str =
            "https://siasky.net/AQAZ1R-KcL4NO_xIVf0q8B1ngPVd6ec-Pu54O0Cto387Nw";

        let url = make_url(&[DEFAULT_PORTAL_URL, "/", ENTRY_LINK]);
        assert_eq!(url, str_to_bytes(EXPECTED_URL));

        let url = make_url(&[DEFAULT_PORTAL_URL, ENTRY_LINK]);
        assert_eq!(url, str_to_bytes(EXPECTED_URL));
    }

    #[test]
    fn str_to_bytes_test() {
        const TEST_STR: &str = "foos";

        assert_eq!(TEST_STR, str::from_utf8(&str_to_bytes(TEST_STR)).unwrap());
    }

    #[test]
    fn should_trim_prefix() {
        const DATA_LINK: &str = "sia://AAA6Z7R0sjreLCr35fJKhMXuc8CE6mxRhkHQtmgtJGzqvw";
        const EXPECTED_RESULT: &str = "AAA6Z7R0sjreLCr35fJKhMXuc8CE6mxRhkHQtmgtJGzqvw";

        assert_eq!(trim_prefix(DATA_LINK, URI_SKYNET_PREFIX), EXPECTED_RESULT);
    }
}