use crate::Time;

/// Access
impl Time {
    /// Return true if this time has been initialized to anything non-default, i.e. 0.
    pub fn is_set(&self) -> bool {
        *self != Self::default()
    }
}

/// Indicates if a number is positive or negative for use in [`Time`].
#[derive(PartialEq, Eq, Debug, Hash, Ord, PartialOrd, Clone, Copy)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
#[allow(missing_docs)]
pub enum Sign {
    Plus,
    Minus,
}

/// Various ways to describe a time format.
#[derive(Debug, Clone, Copy)]
pub enum Format {
    /// A custom format limited to what's in the
    /// [`format`](mod@crate::time::format) submodule.
    Custom(CustomFormat),
    /// The seconds since 1970, also known as unix epoch, like `1660874655`.
    Unix,
    /// The seconds since 1970, followed by the offset, like `1660874655 +0800`
    Raw,
}

/// A custom format for printing and parsing time.
#[derive(Clone, Copy, Debug)]
pub struct CustomFormat(pub(crate) &'static str);

impl From<CustomFormat> for Format {
    fn from(custom_format: CustomFormat) -> Format {
        Format::Custom(custom_format)
    }
}

///
#[allow(clippy::empty_docs)]
pub mod format;
mod init;
mod write;

mod sign {
    use crate::time::Sign;

    impl From<i32> for Sign {
        fn from(v: i32) -> Self {
            if v < 0 {
                Sign::Minus
            } else {
                Sign::Plus
            }
        }
    }
}

mod impls {
    use crate::{time::Sign, Time};

    impl Default for Time {
        fn default() -> Self {
            Time {
                seconds: 0,
                offset: 0,
                sign: Sign::Plus,
            }
        }
    }
}
