use chrono::{DateTime, FixedOffset, Utc};

pub const DEFAULT_TIMEZONE_OFFSET: i32 = -6 * 3600;

#[derive(Copy, Clone, Debug, Eq, PartialEq)]
pub struct LocalTimestampRange {
    pub start: DateTime<FixedOffset>,
    pub end: DateTime<FixedOffset>,
}


#[derive(Copy, Clone, Debug, Eq, PartialEq)]
pub struct UtcTimestampRange {
    pub start: DateTime<Utc>,
    pub end: DateTime<Utc>,
}

impl From<LocalTimestampRange> for UtcTimestampRange {
    fn from(item: LocalTimestampRange) -> Self {
        Self {
            start: item.start.to_utc(),
            end: item.end.to_utc(),
        }
    }
}


/// Super naive implementation. Just a quick and dirty to get a string
pub fn tz_offset_to_string(tz_offset_seconds: i32) -> String {
    if tz_offset_seconds == 3600 * -6 {
        return "Central".to_string();
    }
    else if tz_offset_seconds == 3600 * -5 {
        return "Eastern".to_string();
    }
    else if tz_offset_seconds == 3600 * -7 {
        return "Pacific".to_string();
    }
    else if tz_offset_seconds < 0 {
        return format!("UTC{}", tz_offset_seconds).to_string();
    }

    format!("UTC+{}", tz_offset_seconds).to_string()
}