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use std::ops::{Deref, DerefMut};

use serde::de::DeserializeOwned;

use json_api::{self, Error};
use json_api::doc::{NewObject, Object};
use json_api::query::{self, Page, Query as JsonApiQuery, Sort};
use json_api::value::{Key, Path, Value};
use json_api::value::collections::{map, set, Set};
use rocket::data::{self, Data, FromData};
use rocket::http::Status;
use rocket::outcome::Outcome;
use rocket::request::{self, FromRequest, Request};

#[derive(Debug)]
pub struct Create<T: DeserializeOwned>(pub T);

impl<T: DeserializeOwned> Create<T> {
    /// Consumes the `Create` wrapper and returns the wrapped value.
    pub fn into_inner(self) -> T {
        self.0
    }
}

impl<T: DeserializeOwned> Deref for Create<T> {
    type Target = T;

    fn deref(&self) -> &Self::Target {
        &self.0
    }
}

impl<T: DeserializeOwned> DerefMut for Create<T> {
    fn deref_mut(&mut self) -> &mut Self::Target {
        &mut self.0
    }
}

impl<T: DeserializeOwned> FromData for Create<T> {
    type Error = Error;

    fn from_data(_: &Request, data: Data) -> data::Outcome<Self, Self::Error> {
        let reader = data.open();

        match json_api::from_reader::<_, NewObject, _>(reader) {
            Ok(value) => Outcome::Success(Create(value)),
            Err(e) => fail(e),
        }
    }
}

#[derive(Debug)]
pub struct Update<T: DeserializeOwned>(pub T);

impl<T: DeserializeOwned> Update<T> {
    /// Consumes the `Update` wrapper and returns the wrapped value.
    pub fn into_inner(self) -> T {
        self.0
    }
}

impl<T: DeserializeOwned> Deref for Update<T> {
    type Target = T;

    fn deref(&self) -> &Self::Target {
        &self.0
    }
}

impl<T: DeserializeOwned> DerefMut for Update<T> {
    fn deref_mut(&mut self) -> &mut Self::Target {
        &mut self.0
    }
}

impl<T: DeserializeOwned> FromData for Update<T> {
    type Error = Error;

    fn from_data(_: &Request, data: Data) -> data::Outcome<Self, Self::Error> {
        let reader = data.open();

        match json_api::from_reader::<_, Object, _>(reader) {
            Ok(value) => Outcome::Success(Update(value)),
            Err(e) => fail(e),
        }
    }
}

#[derive(Clone, Debug, Default, PartialEq)]
pub struct Query {
    inner: JsonApiQuery,
}

impl Query {
    /// Consumes the [`Query`] wrapper and returns the wrapped value.
    ///
    /// [`Query`]: ./struct.Query.html
    pub fn into_inner(self) -> JsonApiQuery {
        self.inner
    }

    pub fn fields(&self) -> map::Iter<Key, Set> {
        self.inner.fields.iter()
    }

    pub fn filter(&self) -> map::Iter<Path, Value> {
        self.inner.filter.iter()
    }

    pub fn include(&self) -> set::Iter<Path> {
        self.inner.include.iter()
    }

    pub fn page(&self) -> Option<Page> {
        self.inner.page
    }

    pub fn sort(&self) -> set::Iter<Sort> {
        self.inner.sort.iter()
    }
}

impl Deref for Query {
    type Target = JsonApiQuery;

    fn deref(&self) -> &Self::Target {
        &self.inner
    }
}

impl DerefMut for Query {
    fn deref_mut(&mut self) -> &mut Self::Target {
        &mut self.inner
    }
}

impl<'a, 'r> FromRequest<'a, 'r> for Query {
    type Error = Error;

    fn from_request(req: &'a Request<'r>) -> request::Outcome<Self, Self::Error> {
        match req.uri().query().map(query::from_str) {
            Some(Ok(inner)) => Outcome::Success(Query { inner }),
            Some(Err(e)) => fail(e),
            None => Outcome::Success(Default::default()),
        }
    }
}

fn fail<T, F>(e: Error) -> Outcome<T, (Status, Error), F> {
    use config::ROCKET_ENV;

    if !ROCKET_ENV.is_prod() {
        eprintln!("{:?}", e);
    }

    Outcome::Failure((Status::BadRequest, e))
}