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extern crate core;
use self::core::marker::PhantomData;

pub struct KeyIterator {
    ctx : ::gpgme::Context,
}

impl KeyIterator {

    pub fn new() -> KeyIterator {
        let ctx = ::gpgme::Context::new();

        let err = unsafe {
            ::bindings::gpgme::gpgme_op_keylist_start(
                ctx.raw(), ::std::ptr::null(), 0
            )
        };

        assert_eq!(err, ::bindings::gpg_error::GPG_ERR_NO_ERROR);

        let err = unsafe {
            ::bindings::gpgme::gpgme_set_keylist_mode(
                ctx.raw(), 2 + 4 + 8 // ::bindings::gpgme::GPGME_KEYLIST_MODE_SIGS
            )
        };

        assert_eq!(err, ::bindings::gpg_error::GPG_ERR_NO_ERROR);

        KeyIterator{ctx: ctx}
    }

}

impl Drop for KeyIterator {

    fn drop(&mut self) {
        unsafe {
            ::bindings::gpgme::gpgme_op_keylist_end(self.ctx.raw());
        }
    }

}

impl Iterator for KeyIterator {
    type Item = Key;

    fn next(&mut self) -> Option<Key> {
        let mut key : ::bindings::gpgme::gpgme_key_t;
        let err = unsafe {
            key = ::std::mem::uninitialized();
            ::bindings::gpgme::gpgme_op_keylist_next(
                self.ctx.raw(), &mut key
            )
        };

        if err != ::bindings::gpg_error::GPG_ERR_NO_ERROR {
            None
        }
        else {
            Some(Key{raw: key})
        }
    }

}

pub struct Key {
    raw: ::bindings::gpgme::gpgme_key_t,
}

impl Key {

    pub fn subkeys<'a>(&'a self) -> SubKeyIterator<'a> {
        SubKeyIterator{
            current: SubKey{
                raw: unsafe { self.raw.as_ref() }.unwrap().subkeys,
                lifetime: PhantomData,
            }
        }
    }

    pub fn uids<'a>(&'a self) -> UserIdIterator<'a> {
        UserIdIterator{
            current: UserId{
                raw: unsafe { self.raw.as_ref() }.unwrap().uids,
                lifetime: PhantomData,
            }
        }
    }

}

impl Drop for Key {

    fn drop(&mut self) {
        unsafe { ::bindings::gpgme::gpgme_key_release(self.raw) };
    }

}

pub struct SubKeyIterator<'a> {
    current: SubKey<'a>,
}

impl<'a> Iterator for SubKeyIterator<'a> {
    type Item = SubKey<'a>;

    fn next(&mut self) -> Option<SubKey<'a>> {
        let raw = self.current.raw;

        if raw.is_null() {
            None
        }
        else {
            self.current = SubKey{
                raw: unsafe { raw.as_ref() }.unwrap().next,
                lifetime: PhantomData,
            };
            Some(SubKey{raw: raw, lifetime: PhantomData})
        }
    }

}

#[derive(Clone)]
pub struct SubKey<'a> {
    raw: ::bindings::gpgme::gpgme_subkey_t,
    lifetime: PhantomData<&'a Key>,
}

impl<'a> SubKey<'a> {

    pub fn keyid(&self) -> String {
        let keyid = unsafe { ::std::ffi::CStr::from_ptr(self.raw.as_ref().unwrap().keyid) };
        ::std::str::from_utf8(keyid.to_bytes()).unwrap().to_owned()
    }

}

pub struct UserIdIterator<'a> {
    current: UserId<'a>,
}

impl<'a> Iterator for UserIdIterator<'a> {
    type Item = UserId<'a>;

    fn next(&mut self) -> Option<UserId<'a>> {
        let raw = self.current.raw;

        if raw.is_null() {
            None
        }
        else {
            self.current = UserId{
                raw: unsafe { raw.as_ref() }.unwrap().next,
                lifetime: PhantomData,
            };
            Some(UserId{raw: raw, lifetime: PhantomData})
        }
    }

}

pub struct UserId<'a> {
    raw: ::bindings::gpgme::gpgme_user_id_t,
    lifetime: PhantomData<&'a Key>,
}

impl<'a> UserId<'a> {

    pub fn uid(&self) -> String {
        let uid = unsafe { ::std::ffi::CStr::from_ptr(self.raw.as_ref().unwrap().uid) };
        ::std::str::from_utf8(uid.to_bytes()).unwrap().to_owned()
    }

    pub fn signatures(&self) -> KeySignatureIterator {
        let sig = unsafe { self.raw.as_ref() }.unwrap().signatures;
        println!("{:?}", sig);
        KeySignatureIterator{
            current: KeySignature{
                raw: sig,
                lifetime: PhantomData,
            }
        }
    }

}

pub struct KeySignature<'a> {
    raw: ::bindings::gpgme::gpgme_key_sig_t,
    lifetime: PhantomData<&'a Key>,
}

impl<'a> KeySignature<'a> {

    pub fn keyid(&self) -> String {
        let id = unsafe { ::std::ffi::CStr::from_ptr(self.raw.as_ref().unwrap().keyid) };
        ::std::str::from_utf8(id.to_bytes()).unwrap().to_owned()
    }

}

pub struct KeySignatureIterator<'a> {
    current: KeySignature<'a>,
}

impl<'a> Iterator for KeySignatureIterator<'a> {
    type Item = KeySignature<'a>;

    fn next(&mut self) -> Option<KeySignature<'a>> {
        let raw = self.current.raw;

        if raw.is_null() {
            None
        }
        else {
            self.current = KeySignature{
                raw: unsafe { raw.as_ref() }.unwrap().next,
                lifetime: PhantomData,
            };
            Some(KeySignature{raw: raw, lifetime: PhantomData})
        }
    }

}