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//! Some structs representing basic concepts, and utilities to copy out of "iterators".

use std::fmt;

use sane;

#[derive(Clone, Debug)]
pub struct BinaryPackage {
    pub name: String,
    pub arch: String,
    pub current_version: Option<String>,
    pub candidate_version: Option<String>,
}

impl BinaryPackage {
    pub fn new(view: &sane::PkgView) -> Self {
        BinaryPackage {
            name: view.name(),
            arch: view.arch(),
            current_version: view.current_version(),
            candidate_version: view.candidate_version(),
        }
    }
}

impl fmt::Display for BinaryPackage {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "{}:{}", self.name, self.arch)?;
        if let Some(ref version) = self.current_version {
            write!(f, " @ {}", version)?;
        }
        if let Some(ref version) = self.candidate_version {
            write!(f, " -> {}", version)?;
        }
        Ok(())
    }
}

#[derive(Clone, Debug)]
pub struct Version {
    pub version: String,
    pub arch: String,
    pub section: Option<String>,
    pub source_package: String,
    pub source_version: String,
    pub priority: i32,
}


impl Version {
    pub fn new(view: &sane::VerView) -> Self {
        Version {
            version: view.version(),
            arch: view.arch(),
            section: view.section(),
            source_package: view.source_package(),
            source_version: view.source_version(),
            priority: view.priority(),
        }
    }
}

impl fmt::Display for Version {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "{}:{}", self.version, self.arch)?;
        if let Some(ref section) = self.section {
            write!(f, " in {}", section)?;
        }
        write!(
            f,
            " from {}:{} at {}",
            self.source_package,
            self.source_version,
            self.priority,
        )
    }
}

#[derive(Clone, Debug)]
pub struct Origin {
    pub file_name: String,
    pub archive: String,
    pub version: Option<String>,
    pub origin: Option<String>,
    pub codename: Option<String>,
    pub label: Option<String>,
    pub site: Option<String>,
    pub component: String,
    pub architecture: Option<String>,
    pub index_type: String,
}

impl Origin {
    pub fn from_ver_file(view: &sane::VerFileView) -> Option<Self> {
        // TODO: don't think this deref-ref should really be necessary?
        view.file().next().map(|x| Self::new(&*x))
    }

    pub fn new(view: &sane::PkgFileView) -> Self {
        Origin {
            file_name: view.file_name(),
            archive: view.archive(),
            version: view.version(),
            origin: view.origin(),
            codename: view.codename(),
            label: view.label(),
            site: view.site(),
            component: view.component(),
            architecture: view.architecture(),
            index_type: view.index_type(),
        }
    }
}

impl fmt::Display for Origin {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        // trying to simulate apt-cache policy, but a lot of information is missing
        if self.site.is_some() && self.origin.is_some() && self.label.is_some()
            && self.codename.is_some() && self.architecture.is_some()
        {
            write!(
                f,
                "TODO://{}/TODO(o:{}/l:{}/c:{}) {}/{} {} (f:{})",
                self.site.as_ref().unwrap(),
                self.origin.as_ref().unwrap(),
                self.label.as_ref().unwrap(),
                self.codename.as_ref().unwrap(),
                self.archive,
                self.component,
                self.architecture.as_ref().unwrap(),
                self.file_name
            )
        } else {
            write!(f, "{}", self.file_name)
        }
    }
}

#[derive(Clone, Debug)]
pub struct VersionOrigins {
    pub version: Version,
    pub origins: Vec<Origin>,
}

impl VersionOrigins {
    pub fn new(view: &sane::VerView) -> Self {
        VersionOrigins {
            version: Version::new(view),
            origins: view.origin_iter()
                .map(|o| {
                    Origin::from_ver_file(o)
                        .expect("a version's origin should always have a backing file")
                })
                .collect(),
        }
    }
}


#[derive(Clone, Debug)]
pub struct BinaryPackageVersions {
    pub pkg: BinaryPackage,
    pub versions: Vec<Version>,
}

impl BinaryPackageVersions {
    pub fn new(view: &sane::PkgView) -> Self {
        BinaryPackageVersions {
            pkg: BinaryPackage::new(view),
            versions: view.versions().map(Version::new).collect(),
        }
    }
}

impl fmt::Display for BinaryPackageVersions {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "{} + {} versions", self.pkg, self.versions.len())
    }
}