#![forbid(unsafe_code)]
#![warn(missing_docs, missing_debug_implementations)]
#![doc = include_str!(concat!(env!("CARGO_MANIFEST_DIR" ), "/", "README.md"))]

pub mod consts;
pub mod crypto;
pub mod custom_serde;
pub mod errors;
pub mod ext_traits;
pub mod fp_utils;
pub mod pii;
pub mod signals;
pub mod validation;

/// Date-time utilities.
pub mod date_time {
    use std::num::NonZeroU8;

    use time::{
        format_description::well_known::iso8601::{Config, EncodedConfig, Iso8601, TimePrecision},
        Instant, OffsetDateTime, PrimitiveDateTime,
    };
    /// Struct to represent milliseconds in time sensitive data fields
    #[derive(Debug)]
    pub struct Milliseconds(i32);

    /// Create a new [`PrimitiveDateTime`] with the current date and time in UTC.
    pub fn now() -> PrimitiveDateTime {
        let utc_date_time = OffsetDateTime::now_utc();
        PrimitiveDateTime::new(utc_date_time.date(), utc_date_time.time())
    }

    /// Convert from OffsetDateTime to PrimitiveDateTime
    pub fn convert_to_pdt(offset_time: OffsetDateTime) -> PrimitiveDateTime {
        PrimitiveDateTime::new(offset_time.date(), offset_time.time())
    }

    /// Return the UNIX timestamp of the current date and time in UTC
    pub fn now_unix_timestamp() -> i64 {
        OffsetDateTime::now_utc().unix_timestamp()
    }

    /// Calculate execution time for a async block in milliseconds
    pub async fn time_it<T, Fut: futures::Future<Output = T>, F: FnOnce() -> Fut>(
        block: F,
    ) -> (T, f64) {
        let start = Instant::now();
        let result = block().await;
        (result, start.elapsed().as_seconds_f64() * 1000f64)
    }

    /// Prefix the date field with zero if it has single digit Eg: 1 -> 01
    fn prefix_zero(input: u8) -> String {
        if input < 10 {
            return "0".to_owned() + input.to_string().as_str();
        }
        input.to_string()
    }

    /// Return the current date and time in UTC with the format YYYYMMDDHHmmss Eg: 20191105081132
    pub fn date_as_yyyymmddhhmmss() -> String {
        let now = OffsetDateTime::now_utc();
        format!(
            "{}{}{}{}{}{}",
            now.year(),
            prefix_zero(u8::from(now.month())),
            prefix_zero(now.day()),
            prefix_zero(now.hour()),
            prefix_zero(now.minute()),
            prefix_zero(now.second())
        )
    }

    /// Return the current date and time in UTC with the format [year]-[month]-[day]T[hour]:[minute]:[second].mmmZ Eg: 2023-02-15T13:33:18.898Z
    pub fn date_as_yyyymmddthhmmssmmmz() -> Result<String, time::error::Format> {
        const ISO_CONFIG: EncodedConfig = Config::DEFAULT
            .set_time_precision(TimePrecision::Second {
                decimal_digits: NonZeroU8::new(3),
            })
            .encode();
        now().assume_utc().format(&Iso8601::<ISO_CONFIG>)
    }
}

/// Generate a nanoid with the given prefix and length
#[inline]
pub fn generate_id(length: usize, prefix: &str) -> String {
    format!("{}_{}", prefix, nanoid::nanoid!(length, &consts::ALPHABETS))
}

/// Generate a nanoid with the given prefix and a default length
#[inline]
pub fn generate_id_with_default_len(prefix: &str) -> String {
    let len = consts::ID_LENGTH;
    format!("{}_{}", prefix, nanoid::nanoid!(len, &consts::ALPHABETS))
}