use crate::either::Either;

pub use activitystreams::primitives::{
    Length, MimeMediaType, RdfLangString, XsdAnyUri, XsdDateTime, XsdDuration,
    XsdNonNegativeInteger, XsdString,
};

#[derive(Clone, Debug, Default, serde::Deserialize, serde::Serialize)]
#[serde(transparent)]
pub struct Unparsed(std::collections::HashMap<String, serde_json::Value>);

#[derive(Clone, Debug, serde::Deserialize, serde::Serialize)]
#[serde(transparent)]
pub struct AnyString(Either<XsdString, RdfLangString>);

pub type Unit = Either<Length, XsdString>;

#[derive(Clone, Debug, serde::Deserialize, serde::Serialize)]
#[serde(transparent)]
pub struct OneOrMany<T>(pub Either<T, Vec<T>>);

impl Unparsed {
    pub(crate) fn remove(&mut self, key: &str) -> serde_json::Value {
        self.0.remove(key).unwrap_or(serde_json::Value::Null)
    }

    pub(crate) fn insert(&mut self, key: String, value: serde_json::Value) {
        self.0.insert(key, value);
    }
}

impl AnyString {
    pub fn as_xsd_string(&self) -> Option<&XsdString> {
        self.0.as_ref().left()
    }

    pub fn as_rdf_lang_string(&self) -> Option<&RdfLangString> {
        self.0.as_ref().right()
    }

    pub fn xsd_string(self) -> Option<XsdString> {
        self.0.left()
    }

    pub fn rdf_lang_string(self) -> Option<RdfLangString> {
        self.0.right()
    }

    pub fn from_xsd_string<T>(string: T) -> Self
    where
        XsdString: From<T>,
    {
        AnyString(Either::Left(string.into()))
    }

    pub fn from_rdf_lang_string<T>(string: T) -> Self
    where
        RdfLangString: From<T>,
    {
        AnyString(Either::Right(string.into()))
    }

    pub fn set_xsd_string<T>(&mut self, string: T)
    where
        XsdString: From<T>,
    {
        self.0 = Either::Left(string.into());
    }

    pub fn set_rdf_lang_string<T>(&mut self, string: T)
    where
        RdfLangString: From<T>,
    {
        self.0 = Either::Right(string.into());
    }
}

impl OneOrMany<AnyString> {
    pub fn as_single_xsd_string(&self) -> Option<&XsdString> {
        self.as_one()
            .and_then(|any_string| any_string.as_xsd_string())
    }

    pub fn as_single_rdf_lang_string(&self) -> Option<&RdfLangString> {
        self.as_one()
            .and_then(|any_string| any_string.as_rdf_lang_string())
    }

    pub fn single_xsd_string(self) -> Option<XsdString> {
        self.one().and_then(|any_string| any_string.xsd_string())
    }

    pub fn single_rdf_lang_string(self) -> Option<RdfLangString> {
        self.one()
            .and_then(|any_string| any_string.rdf_lang_string())
    }

    pub fn from_xsd_string<T>(string: T) -> Self
    where
        XsdString: From<T>,
    {
        Self::from_one(AnyString::from_xsd_string(string))
    }

    pub fn from_rdf_lang_string<T>(string: T) -> Self
    where
        RdfLangString: From<T>,
    {
        Self::from_one(AnyString::from_rdf_lang_string(string))
    }
}

impl<T> OneOrMany<T> {
    pub fn as_one(&self) -> Option<&T> {
        self.0.as_ref().left()
    }

    pub fn one(self) -> Option<T> {
        self.0.left()
    }

    pub fn as_many(&self) -> Option<&[T]> {
        self.0.as_ref().right().map(|v| v.as_ref())
    }

    pub fn many(self) -> Option<Vec<T>> {
        self.0.right()
    }

    pub fn unwrap_to_vec(self) -> Vec<T> {
        match self.0 {
            Either::Left(t) => vec![t],
            Either::Right(v) => v,
        }
    }

    pub fn from_one(t: T) -> Self {
        OneOrMany(Either::Left(t))
    }

    pub fn from_many(items: Vec<T>) -> Self {
        OneOrMany(Either::Right(items))
    }

    pub fn set_one<U>(&mut self, u: U) -> &mut Self
    where
        T: From<U>,
    {
        self.0 = Either::Left(u.into());
        self
    }

    pub fn set_many<U>(&mut self, items: impl IntoIterator<Item = U>) -> &mut Self
    where
        T: From<U>,
    {
        self.0 = Either::Right(items.into_iter().map(T::from).collect());
        self
    }

    pub fn add<U>(&mut self, u: U) -> &mut Self
    where
        T: From<U>,
    {
        let mut v = match std::mem::replace(&mut self.0, Either::Right(vec![])) {
            Either::Left(one) => vec![one],
            Either::Right(v) => v,
        };
        v.push(u.into());
        self.0 = Either::Right(v);
        self
    }

    pub fn add_many<U>(&mut self, items: impl IntoIterator<Item = U>) -> &mut Self
    where
        T: From<U>,
    {
        let mut v = match std::mem::replace(&mut self.0, Either::Right(vec![])) {
            Either::Left(one) => vec![one],
            Either::Right(v) => v,
        };
        v.extend(items.into_iter().map(T::from));
        self.0 = Either::Right(v);
        self
    }
}

impl From<XsdString> for AnyString {
    fn from(s: XsdString) -> Self {
        AnyString::from_xsd_string(s)
    }
}

impl From<RdfLangString> for AnyString {
    fn from(s: RdfLangString) -> Self {
        AnyString::from_rdf_lang_string(s)
    }
}

impl From<XsdString> for OneOrMany<AnyString> {
    fn from(s: XsdString) -> Self {
        OneOrMany::<AnyString>::from_xsd_string(s)
    }
}

impl From<RdfLangString> for OneOrMany<AnyString> {
    fn from(s: RdfLangString) -> Self {
        OneOrMany::<AnyString>::from_rdf_lang_string(s)
    }
}