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use semver::{Comparator, Op, Version, VersionReq};
use std::fmt::{self, Display};

#[derive(PartialEq, Eq, Hash, Clone, Debug)]
pub enum OptVersionReq {
    Any,
    Req(VersionReq),
}

pub trait VersionExt {
    fn is_prerelease(&self) -> bool;
}

pub trait VersionReqExt {
    fn exact(version: &Version) -> Self;
}

impl VersionExt for Version {
    fn is_prerelease(&self) -> bool {
        !self.pre.is_empty()
    }
}

impl VersionReqExt for VersionReq {
    fn exact(version: &Version) -> Self {
        VersionReq {
            comparators: vec![Comparator {
                op: Op::Exact,
                major: version.major,
                minor: Some(version.minor),
                patch: Some(version.patch),
                pre: version.pre.clone(),
            }],
        }
    }
}

impl OptVersionReq {
    pub fn exact(version: &Version) -> Self {
        OptVersionReq::Req(VersionReq::exact(version))
    }

    pub fn is_exact(&self) -> bool {
        match self {
            OptVersionReq::Any => false,
            OptVersionReq::Req(req) => {
                req.comparators.len() == 1 && {
                    let cmp = &req.comparators[0];
                    cmp.op == Op::Exact && cmp.minor.is_some() && cmp.patch.is_some()
                }
            }
        }
    }

    pub fn matches(&self, version: &Version) -> bool {
        match self {
            OptVersionReq::Any => true,
            OptVersionReq::Req(req) => req.matches(version),
        }
    }
}

impl Display for OptVersionReq {
    fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            OptVersionReq::Any => formatter.write_str("*"),
            OptVersionReq::Req(req) => Display::fmt(req, formatter),
        }
    }
}

impl From<VersionReq> for OptVersionReq {
    fn from(req: VersionReq) -> Self {
        OptVersionReq::Req(req)
    }
}