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use {Document, Error, IntoDatabasePath, IntoDocumentPath, IntoViewPath, Revision, action, serde, url};
use transport::HyperTransport;

/// Describes a type that may be converted into a URL.
///
/// The `IntoUrl` trait is like the `Into` trait except that its conversion may
/// fail, such as when parsing a string containing an invalid URL.
///
pub trait IntoUrl {
    fn into_url(self) -> Result<url::Url, Error>;
}

impl IntoUrl for url::Url {
    fn into_url(self) -> Result<url::Url, Error> {
        Ok(self)
    }
}

impl<'a> IntoUrl for &'a str {
    fn into_url(self) -> Result<url::Url, Error> {
        url::Url::parse(self).map_err(|e| Error::UrlParse { cause: e })
    }
}

impl<'a> IntoUrl for &'a String {
    fn into_url(self) -> Result<url::Url, Error> {
        url::Url::parse(self).map_err(|e| Error::UrlParse { cause: e })
    }
}

/// Manages all communication with a CouchDB server.
///
/// A `Client` communicates with the CouchDB server via **actions**. Each action
/// abstracts a single HTTP request-response pair, such as to create a database
/// (i.e., PUT `/db`) or read a document (i.e., GET `/db/doc`).
///
/// A `Client` communicates with exactly one CouchDB server, as specified by the
/// URI set when the `Client` is constructed.
///
#[derive(Debug)]
pub struct Client {
    transport: HyperTransport,
}

impl Client {
    /// Constructs a client for the given server.
    pub fn new<U: IntoUrl>(server_url: U) -> Result<Self, Error> {
        let server_url = try!(server_url.into_url());
        let transport = HyperTransport::new(server_url);
        Ok((Client { transport: transport }))
    }

    /// Builds an action to create a database.
    pub fn create_database<'a, P>(&'a self, db_path: P) -> action::CreateDatabase<'a, HyperTransport, P>
        where P: IntoDatabasePath
    {
        action::CreateDatabase::new(&self.transport, db_path)
    }

    /// Builds an action to create a document.
    pub fn create_document<'a, C, P>(&'a self,
                                     db_path: P,
                                     content: &'a C)
                                     -> action::CreateDocument<'a, HyperTransport, P, C>
        where C: serde::Serialize,
              P: IntoDatabasePath
    {
        action::CreateDocument::new(&self.transport, db_path, content)
    }

    /// Builds an action to read a document.
    pub fn read_document<'a, P>(&'a self, doc_path: P) -> action::ReadDocument<'a, HyperTransport, P>
        where P: IntoDocumentPath
    {
        action::ReadDocument::new(&self.transport, doc_path)
    }

    /// Builds an action to update a document.
    pub fn update_document<'a>(&'a self, doc: &'a Document) -> action::UpdateDocument<'a, HyperTransport> {
        action::UpdateDocument::new(&self.transport, doc)
    }

    /// Builds an action to delete a document.
    pub fn delete_document<'a, P>(&'a self,
                                  doc_path: P,
                                  revision: &'a Revision)
                                  -> action::DeleteDocument<'a, HyperTransport, P>
        where P: IntoDocumentPath
    {
        action::DeleteDocument::new(&self.transport, doc_path, revision)
    }

    /// Builds an action to execute a view.
    pub fn execute_view<'a, P>(&'a self, view_path: P) -> action::ExecuteView<'a, HyperTransport, P, (), ()>
        where P: IntoViewPath
    {
        action::ExecuteView::new(&self.transport, view_path)
    }
}