# date.rs - source
Source of the Rust file `src/date.rs`.
Keywords: rust, rustlang, rust-lang

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    /*
     * Copyright (C) 2021  Aravinth Manivannan <realaravinth@batsense.net>
     *
     * This program is free software: you can redistribute it and/or modify
     * it under the terms of the GNU Affero General Public License as
     * published by the Free Software Foundation, either version 3 of the
     * License, or (at your option) any later version.
     *
     * This program is distributed in the hope that it will be useful,
     * but WITHOUT ANY WARRANTY; without even the implied warranty of
     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     * GNU Affero General Public License for more details.
     *
     * You should have received a copy of the GNU Affero General Public License
     * along with this program.  If not, see <https://www.gnu.org/licenses/>.
     */
    use std::fmt::Debug;

    use sqlx::types::time::OffsetDateTime;

    #[derive(Clone)]
    pub struct Date {
        pub time: OffsetDateTime,
    }

    impl Debug for Date {
        fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
            f.debug_struct("Date")
                .field("time", &self.print_date())
                .finish()
        }
    }

    pub const MINUTE: i64 = 60;
    pub const HOUR: i64 = MINUTE * 60;
    pub const DAY: i64 = HOUR * 24;
    pub const WEEK: i64 = DAY * 7;

    impl Date {
        pub fn format(date: &OffsetDateTime) -> String {
            let timestamp = date.unix_timestamp();
            let now = OffsetDateTime::now_utc().unix_timestamp();

            let difference = now - timestamp;

            if difference >= 3 * WEEK {
                date.format("%d-%m-%y")
            } else if (DAY..(3 * WEEK)).contains(&difference) {
                format!("{} days ago", date.hour())
            } else if (HOUR..DAY).contains(&difference) {
                format!("{} hours ago", date.hour())
            } else if (MINUTE..HOUR).contains(&difference) {
                format!("{} minutes ago", date.minute())
            } else {
                format!("{} seconds ago", date.second())
            }
        }

        /// print relative time from date
        pub fn print_date(&self) -> String {
            Self::format(&self.time)
        }

        /// print date
        pub fn date(&self) -> String {
            self.time.format("%F %r %z")
        }
    }

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

        #[test]
        fn print_date_test() {
            let mut n = Date {
                time: OffsetDateTime::now_utc(),
            };

            let timestamp = n.time.unix_timestamp();
            println!("timestamp: {}", timestamp);

            // seconds test
            assert!(n.print_date().contains("seconds ago"));
            n.time = OffsetDateTime::from_unix_timestamp(timestamp - 5);
            assert!(n.print_date().contains("seconds ago"));

            // minutes test
            n.time = OffsetDateTime::from_unix_timestamp(timestamp - MINUTE * 2);
            assert!(n.print_date().contains("minutes ago"));
            n.time = OffsetDateTime::from_unix_timestamp(timestamp - MINUTE * 56);
            assert!(n.print_date().contains("minutes ago"));

            // hours test
            n.time = OffsetDateTime::from_unix_timestamp(timestamp - HOUR);
            assert!(n.print_date().contains("hours ago"));
            n.time = OffsetDateTime::from_unix_timestamp(timestamp - HOUR * 23);
            assert!(n.print_date().contains("hours ago"));

            // days test
            n.time = OffsetDateTime::from_unix_timestamp(timestamp - 2 * WEEK);
            assert!(n.print_date().contains("days ago"));

            // date test
            n.time = OffsetDateTime::from_unix_timestamp(timestamp - 6 * WEEK);
            let date = n.time.format("%d-%m-%y");
            assert!(n.print_date().contains(&date))
        }
    }