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use std::fmt;

pub trait DependencyExt: fmt::Display {
    fn version(&self, version: &str) -> Dependency {
        Dependency::version(&self.to_string(), version)
    }

    fn optional(&self) -> Dependency {
        Dependency::new(&self.to_string(), DependencyType::Crate(Crate { version: None }))
                   .optional(true)
                   .build()
    }

    fn path(&self, path: &str) -> Dependency {
        Dependency::new(&self.to_string(), DependencyType::Path(path.to_string()))
    }
}

impl<T: fmt::Display> DependencyExt for T {}

#[derive(Debug, Clone, PartialEq)]
pub struct Dependency {
    pub label: String,
    pub dep_type: DependencyType,
    pub optional: Option<bool>,
    pub default_features: Option<bool>,
}

impl Dependency {
    pub fn new(label: &str, dep_type: DependencyType) -> Dependency {
        Dependency {
            label: label.to_string(),
            dep_type: dep_type,
            optional: None,
            default_features: None, 
        }
    }

    pub fn is_inline(&self) -> bool {
        // types of dependencies that look ok when rendered inline
        //
        // e.g.
        //
        // foo = "1.0.0"
        // bar = { path = "baz" }
        // qux = { git = "https://github.com/foo/bar" }
        let inline_type = match self.dep_type {
            DependencyType::Crate(..) => true,
            DependencyType::Repo(Repo { url: _, repo_type: None }) => true,
            DependencyType::Path(..) => true,
            _ => false
        };
        // adding `optional = true` inline looks ok, but not `default_features` (imo)
        match (inline_type, self.default_features) {
            (true, None) => return true,
            _ => return false,
        }
    }

    pub fn optional(&mut self, optional: bool) -> &mut Self {
        self.optional = Some(optional);
        self
    }

    pub fn default_features(&mut self, default_features: bool) -> &mut Self {
        self.default_features = Some(default_features);
        self
    }

    /* Constructors */
    pub fn repo(label: &str, repo: &str) -> Dependency {
        Dependency::new(label, DependencyType::Repo(Repo { url: repo.into(), repo_type: None}))
    }

    pub fn version(label: &str, version: &str) -> Dependency {
        Dependency::new(label, DependencyType::Crate(Crate { version: Some(version.into())}))
    }

    pub fn path(label: &str, path: &str) -> Dependency {
        Dependency::new(label, DependencyType::Path(path.into()))
    }

    pub fn rev(label: &str, repo: &str, rev: &str) -> Dependency {
        Dependency::new(label, DependencyType::Repo(Repo { url: repo.into(), repo_type: Some(RepoType::Rev(rev.into()))}))
    }

    pub fn tag(label: &str, repo: &str, tag: &str) -> Dependency {
        Dependency::new(label, DependencyType::Repo(Repo { url: repo.into(), repo_type: Some(RepoType::Tag(tag.into()))}))
    }

    pub fn branch(label: &str, repo: &str, branch: &str) -> Dependency {
        Dependency::new(label, DependencyType::Repo(Repo { url: repo.into(), repo_type: Some(RepoType::Branch(branch.into()))}))
    }

    pub fn build(&self) -> Self {
        self.clone()
    }
}

impl<'a> From<&'a str> for Dependency {
    fn from(s: &'a str) -> Dependency {
        Dependency::new(s, DependencyType::Crate(Crate { version: None}))
    }
}

impl From<String> for Dependency {
    fn from(s: String) -> Dependency {
        Dependency::from(s.as_str())
    }
}

impl<'a> From<&'a Dependency> for Dependency {
    fn from(d: &Dependency) -> Dependency {
        d.clone()
    }
}

impl<'a> From<&'a mut Dependency> for Dependency {
    fn from(d: &'a mut Dependency) -> Dependency {
        d.clone()
    }
}

#[derive(Debug, Clone, PartialEq)]
pub enum DependencyType {
    Crate(Crate),
    Repo(Repo),
    Path(String),
}

#[derive(Debug, Clone, PartialEq)]
pub struct Crate {
    pub version: Option<String>,
}

#[derive(Debug, Clone, PartialEq)]
pub struct Repo {
    pub url: String,
    pub repo_type: Option<RepoType>,
}

#[derive(Debug, Clone, PartialEq)]
pub enum RepoType {
    Rev(String),
    Tag(String),
    Branch(String),
}