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use std::hash::Hash;

use crate::fnv1a32;
use crate::raw::root::RED4ext as red;

#[derive(Debug, Clone, Copy)]
#[repr(transparent)]
pub struct Cruid(red::CRUID);

impl Cruid {
    #[inline]
    pub const fn is_defined(self) -> bool {
        self.0.unk00 != 0
    }

    pub const fn new(str: &str) -> Self {
        Self(red::CRUID {
            // https://discord.com/channels/717692382849663036/717720094196760760/1208391892119719946
            unk00: 0xF000_0000_0000_0000_u64 as i64 | (fnv1a32(str) << 2) as i64,
        })
    }
}

impl PartialEq for Cruid {
    fn eq(&self, other: &Self) -> bool {
        self.0.unk00 == other.0.unk00
    }
}

impl Eq for Cruid {}

impl PartialOrd for Cruid {
    fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
        Some(self.cmp(other))
    }
}

impl Ord for Cruid {
    fn cmp(&self, other: &Self) -> std::cmp::Ordering {
        self.0.unk00.cmp(&other.0.unk00)
    }
}

impl Hash for Cruid {
    fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
        self.0.unk00.hash(state);
    }
}

impl Default for Cruid {
    fn default() -> Self {
        Self(red::CRUID { unk00: 0 })
    }
}

impl From<i64> for Cruid {
    fn from(hash: i64) -> Self {
        Self(red::CRUID { unk00: hash })
    }
}

impl From<Cruid> for i64 {
    fn from(Cruid(red::CRUID { unk00 }): Cruid) -> Self {
        unk00
    }
}

#[cfg(not(test))] // only available in-game
impl From<crate::types::CName> for Cruid {
    fn from(value: crate::types::CName) -> Self {
        Self::new(value.as_str())
    }
}

#[cfg(test)]
mod tests {
    use super::Cruid;
    use crate::types::CName;

    #[test]
    fn conversion() {
        const NAME: &str = "Items.FirstAidWhiffV0";
        let cruid = Cruid::new(NAME);
        assert_eq!(i64::from(cruid), -0x0FFF_FFFF_CFF0_570C);
        let cname = CName::new(NAME);
        assert_eq!(u64::from(cname), 0x4856_A96F_939D_54FD);
        // CName and CRUID hashes are not equivalent
        assert_ne!(i64::from(cruid), u64::from(cname) as i64);
    }
}