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use core::{Dependency, Package, PackageId, Source, SourceId, Summary};
use core::source::MaybePackage;
use util::errors::{CargoResult, CargoResultExt};

pub struct ReplacedSource<'cfg> {
    to_replace: SourceId,
    replace_with: SourceId,
    inner: Box<Source + 'cfg>,
}

impl<'cfg> ReplacedSource<'cfg> {
    pub fn new(
        to_replace: &SourceId,
        replace_with: &SourceId,
        src: Box<Source + 'cfg>,
    ) -> ReplacedSource<'cfg> {
        ReplacedSource {
            to_replace: to_replace.clone(),
            replace_with: replace_with.clone(),
            inner: src,
        }
    }
}

impl<'cfg> Source for ReplacedSource<'cfg> {
    fn query(&mut self, dep: &Dependency, f: &mut FnMut(Summary)) -> CargoResult<()> {
        let (replace_with, to_replace) = (&self.replace_with, &self.to_replace);
        let dep = dep.clone().map_source(to_replace, replace_with);

        self.inner
            .query(
                &dep,
                &mut |summary| f(summary.map_source(replace_with, to_replace)),
            )
            .chain_err(|| format!("failed to query replaced source {}", self.to_replace))?;
        Ok(())
    }

    fn fuzzy_query(&mut self, dep: &Dependency, f: &mut FnMut(Summary)) -> CargoResult<()> {
        let (replace_with, to_replace) = (&self.replace_with, &self.to_replace);
        let dep = dep.clone().map_source(to_replace, replace_with);

        self.inner
            .fuzzy_query(
                &dep,
                &mut |summary| f(summary.map_source(replace_with, to_replace)),
            )
            .chain_err(|| format!("failed to query replaced source {}", self.to_replace))?;
        Ok(())
    }

    fn supports_checksums(&self) -> bool {
        self.inner.supports_checksums()
    }

    fn requires_precise(&self) -> bool {
        self.inner.requires_precise()
    }

    fn source_id(&self) -> &SourceId {
        &self.to_replace
    }

    fn replaced_source_id(&self) -> &SourceId {
        &self.replace_with
    }

    fn update(&mut self) -> CargoResult<()> {
        self.inner
            .update()
            .chain_err(|| format!("failed to update replaced source {}", self.to_replace))?;
        Ok(())
    }

    fn download(&mut self, id: &PackageId) -> CargoResult<MaybePackage> {
        let id = id.with_source_id(&self.replace_with);
        let pkg = self.inner
            .download(&id)
            .chain_err(|| format!("failed to download replaced source {}", self.to_replace))?;
        Ok(match pkg {
            MaybePackage::Ready(pkg) => {
                MaybePackage::Ready(pkg.map_source(&self.replace_with, &self.to_replace))
            }
            other @ MaybePackage::Download { .. } => other,
        })
    }

    fn finish_download(&mut self, id: &PackageId, data: Vec<u8>)
        -> CargoResult<Package>
    {
        let id = id.with_source_id(&self.replace_with);
        let pkg = self.inner
            .finish_download(&id, data)
            .chain_err(|| format!("failed to download replaced source {}", self.to_replace))?;
        Ok(pkg.map_source(&self.replace_with, &self.to_replace))
    }

    fn fingerprint(&self, id: &Package) -> CargoResult<String> {
        self.inner.fingerprint(id)
    }

    fn verify(&self, id: &PackageId) -> CargoResult<()> {
        let id = id.with_source_id(&self.replace_with);
        self.inner.verify(&id)
    }

    fn describe(&self) -> String {
        format!("{} (which is replacing {})", self.inner.describe(), self.to_replace)
    }

    fn is_replaced(&self) -> bool {
        true
    }
}