//! Types creating the base for most ActivityStreams fields.
//!
//! These types are not themselves defined by ActivityStreams, but are referenced by the
//! specification.
//!
//! ```rust
//! use activitystreams_new::primitives::{AnyString, OneOrMany, Unit};
//!
//! let any_string = AnyString::from_xsd_string("hey");
//!
//! let one_or_many = OneOrMany::<i32>::from_one(1234);
//!
//! let cm = Unit::centimeters();
//! ```
use crate::either::Either;

pub use activitystreams::primitives::{
    MimeMediaType, MimeMediaTypeError, RdfLangString, XsdAnyUri, XsdAnyUriError, XsdDateTime,
    XsdDateTimeError, XsdDuration, XsdDurationError, XsdFloat, XsdFloatError,
    XsdNonNegativeInteger,
};

use activitystreams::primitives::Length;

/// A type representing any kind of string
///
/// In the ActivityStreams specification, string types are often defined as either an xsd:String or
/// and rdf:langString. The AnyString type represents this union.
#[derive(Clone, Debug, serde::Deserialize, serde::Serialize)]
#[serde(transparent)]
pub struct AnyString(Either<String, RdfLangString>);

/// A type representing units of length
///
/// It can be any of the following
/// - Centimeters
/// - Meters
/// - Kilometers
/// - Inches
/// - Feet
/// - A custom value
#[derive(
    Clone, Debug, Eq, Hash, Ord, PartialEq, PartialOrd, serde::Deserialize, serde::Serialize,
)]
#[serde(transparent)]
pub struct Unit(Either<Length, String>);

/// A type representing at least one value
///
/// When translated to JSON, it can represent the following structures:
/// ```json
/// {
///     "key": value
/// }
/// ```
/// ```json
/// {
///     "key": [],
/// }
/// ```
/// ```json
/// {
///     "key": [value, ...]
/// }
/// ```
#[derive(Clone, Debug, serde::Deserialize, serde::Serialize)]
#[serde(transparent)]
pub struct OneOrMany<T>(pub(crate) Either<T, Vec<T>>);

impl AnyString {
    /// Borrow the AnyString as an &str
    ///
    /// ```rust
    /// # fn main() -> Result<(), anyhow::Error> {
    /// # use activitystreams_new::primitives::AnyString;
    /// # let any_string = AnyString::from_xsd_string("hi");
    /// #
    /// let s_borrow = any_string
    ///     .as_xsd_string()
    ///     .ok_or(anyhow::Error::msg("Wrong string type"))?;
    /// # Ok(())
    /// # }
    /// ```
    pub fn as_xsd_string(&self) -> Option<&str> {
        self.0.as_ref().left().map(|l| l.as_str())
    }

    /// Borrow the AnyString as an RdfLangString
    ///
    /// ```rust
    /// # fn main() -> Result<(), anyhow::Error> {
    /// # use activitystreams_new::primitives::{AnyString, RdfLangString};
    /// # let any_string = AnyString::from_rdf_lang_string(RdfLangString {
    /// #     value: "hi".into(),
    /// #     language: "en".into(),
    /// # });
    /// #
    /// let s_borrow = any_string
    ///     .as_rdf_lang_string()
    ///     .ok_or(anyhow::Error::msg("Wrong string type"))?;
    /// # Ok(())
    /// # }
    /// ```
    pub fn as_rdf_lang_string(&self) -> Option<&RdfLangString> {
        self.0.as_ref().right()
    }

    /// Take the AnyString as a String
    ///
    /// ```rust
    /// # fn main() -> Result<(), anyhow::Error> {
    /// # use activitystreams_new::primitives::AnyString;
    /// # let any_string = AnyString::from_xsd_string("hi");
    /// #
    /// let xsd_string = any_string
    ///     .xsd_string()
    ///     .ok_or(anyhow::Error::msg("Wrong string type"))?;
    /// # Ok(())
    /// # }
    /// ```
    pub fn xsd_string(self) -> Option<String> {
        self.0.left()
    }

    /// Take the AnyString as an RdfLangString
    ///
    /// ```rust
    /// # fn main() -> Result<(), anyhow::Error> {
    /// # use activitystreams_new::primitives::{AnyString, RdfLangString};
    /// # let any_string = AnyString::from_rdf_lang_string(RdfLangString {
    /// #     value: "hi".into(),
    /// #     language: "en".into(),
    /// # });
    /// #
    /// let rdf_lang_string = any_string
    ///     .rdf_lang_string()
    ///     .ok_or(anyhow::Error::msg("Wrong string type"))?;
    /// # Ok(())
    /// # }
    /// ```
    pub fn rdf_lang_string(self) -> Option<RdfLangString> {
        self.0.right()
    }

    /// Create a new AnyString from an `Into<String>`
    ///
    /// ```rust
    /// use activitystreams_new::primitives::AnyString;
    ///
    /// let any_string = AnyString::from_xsd_string("hi");
    /// ```
    pub fn from_xsd_string<T>(string: T) -> Self
    where
        T: Into<String>,
    {
        AnyString(Either::Left(string.into()))
    }

    /// Create a new AnyString from an RdfLangString
    ///
    /// ```rust
    /// use activitystreams_new::primitives::{AnyString, RdfLangString};
    ///
    /// let any_string = AnyString::from_rdf_lang_string(RdfLangString {
    ///     value: "hi".into(),
    ///     language: "en".into(),
    /// });
    /// ```
    pub fn from_rdf_lang_string<T>(string: T) -> Self
    where
        T: Into<RdfLangString>,
    {
        AnyString(Either::Right(string.into()))
    }

    /// Replace the contents of self with a String
    ///
    /// ```rust
    /// use activitystreams_new::primitives::{AnyString, RdfLangString};
    ///
    /// let mut any_string = AnyString::from_rdf_lang_string(RdfLangString {
    ///     value: "hi".into(),
    ///     language: "en".into(),
    /// });
    ///
    /// any_string.set_xsd_string("hi");
    ///
    /// assert!(any_string.as_xsd_string().is_some());
    /// ```
    pub fn set_xsd_string<T>(&mut self, string: T)
    where
        T: Into<String>,
    {
        self.0 = Either::Left(string.into());
    }

    /// Replace the contents of self with an RdfLangString
    ///
    /// ```rust
    /// use activitystreams_new::primitives::{AnyString, RdfLangString};
    ///
    /// let mut any_string = AnyString::from_xsd_string("hi");
    ///
    /// any_string.set_rdf_lang_string(RdfLangString {
    ///     value: "hi".into(),
    ///     language: "en".into(),
    /// });
    ///
    /// assert!(any_string.as_rdf_lang_string().is_some());
    /// ```
    pub fn set_rdf_lang_string<T>(&mut self, string: T)
    where
        T: Into<RdfLangString>,
    {
        self.0 = Either::Right(string.into());
    }
}

impl OneOrMany<AnyString> {
    /// Try to borrow a single String from the current object
    ///
    /// ```rust
    /// # fn main() -> Result<(), anyhow::Error> {
    /// # use activitystreams_new::primitives::{OneOrMany, AnyString};
    /// # let string = OneOrMany::<AnyString>::from_xsd_string("Hey");
    /// string
    ///     .as_single_xsd_string()
    ///     .ok_or(anyhow::Error::msg("Wrong string type"))?;
    /// # Ok(())
    /// # }
    /// ```
    pub fn as_single_xsd_string(&self) -> Option<&str> {
        self.as_one()
            .and_then(|any_string| any_string.as_xsd_string())
    }

    /// Try to borrow a single RdfLangString from the current object
    ///
    /// ```rust
    /// # fn main() -> Result<(), anyhow::Error> {
    /// # use activitystreams_new::primitives::{OneOrMany, RdfLangString};
    /// # let string = OneOrMany::from_rdf_lang_string(RdfLangString {
    /// #   value: "hi".into(),
    /// #   language: "en".into(),
    /// # });
    /// string
    ///     .as_single_rdf_lang_string()
    ///     .ok_or(anyhow::Error::msg("Wrong string type"))?;
    /// # Ok(())
    /// # }
    /// ```
    pub fn as_single_rdf_lang_string(&self) -> Option<&RdfLangString> {
        self.as_one()
            .and_then(|any_string| any_string.as_rdf_lang_string())
    }

    /// Try to take a single String from the current object
    ///
    /// ```rust
    /// # fn main() -> Result<(), anyhow::Error> {
    /// # use activitystreams_new::primitives::{OneOrMany, AnyString};
    /// # let string = OneOrMany::<AnyString>::from_xsd_string("Hey");
    /// string
    ///     .single_xsd_string()
    ///     .ok_or(anyhow::Error::msg("Wrong string type"))?;
    /// # Ok(())
    /// # }
    /// ```
    pub fn single_xsd_string(self) -> Option<String> {
        self.one().and_then(|any_string| any_string.xsd_string())
    }

    /// Try to take a single RdfLangString from the current object
    ///
    /// ```rust
    /// # fn main() -> Result<(), anyhow::Error> {
    /// # use activitystreams_new::primitives::{OneOrMany, RdfLangString};
    /// # let string = OneOrMany::from_rdf_lang_string(RdfLangString {
    /// #   value: "hi".into(),
    /// #   language: "en".into(),
    /// # });
    /// string
    ///     .single_rdf_lang_string()
    ///     .ok_or(anyhow::Error::msg("Wrong string type"))?;
    /// # Ok(())
    /// # }
    /// ```
    pub fn single_rdf_lang_string(self) -> Option<RdfLangString> {
        self.one()
            .and_then(|any_string| any_string.rdf_lang_string())
    }

    /// Create the object from a single String
    ///
    /// ```rust
    /// use activitystreams_new::primitives::{OneOrMany, AnyString};
    ///
    /// let string = OneOrMany::<AnyString>::from_xsd_string("hi");
    /// ```
    pub fn from_xsd_string<T>(string: T) -> Self
    where
        T: Into<String>,
    {
        Self::from_one(AnyString::from_xsd_string(string))
    }

    /// Create the object from a single RdfLangString
    ///
    /// ```rust
    /// use activitystreams_new::primitives::{OneOrMany, RdfLangString};
    ///
    /// let string = OneOrMany::from_rdf_lang_string(RdfLangString {
    ///     value: "hi".into(),
    ///     language: "en".into(),
    /// });
    /// ```
    pub fn from_rdf_lang_string<T>(string: T) -> Self
    where
        T: Into<RdfLangString>,
    {
        Self::from_one(AnyString::from_rdf_lang_string(string))
    }

    /// Add a String to the object, appending to whatever is currently included
    ///
    /// ```rust
    /// use activitystreams_new::primitives::{OneOrMany, AnyString};
    ///
    /// let mut string = OneOrMany::<AnyString>::from_xsd_string("Hello");
    ///
    /// string
    ///     .add_xsd_string("Hey")
    ///     .add_xsd_string("hi");
    /// ```
    pub fn add_xsd_string<T>(&mut self, string: T) -> &mut Self
    where
        T: Into<String>,
    {
        self.add(string.into())
    }

    /// Add an RdfLangString to the object, appending to whatever is currently included
    ///
    /// ```rust
    /// use activitystreams_new::primitives::{AnyString, OneOrMany, RdfLangString};
    ///
    /// let mut string = OneOrMany::<AnyString>::from_xsd_string("Hello");
    ///
    /// string
    ///     .add_rdf_lang_string(RdfLangString {
    ///         value: "Hey".into(),
    ///         language: "en".into(),
    ///     })
    ///     .add_rdf_lang_string(RdfLangString {
    ///         value: "hi".into(),
    ///         language: "en".into(),
    ///     });
    /// ```
    pub fn add_rdf_lang_string<T>(&mut self, string: T) -> &mut Self
    where
        T: Into<RdfLangString>,
    {
        self.add(string.into())
    }
}

impl<T> OneOrMany<T> {
    /// Get a reference to a single value
    ///
    /// ```rust
    /// # use activitystreams_new::primitives::OneOrMany;
    /// # let value = OneOrMany::from_one(1);
    /// if let Some(v) = value.as_one() {
    ///     println!("{:?}", v);
    /// }
    /// ```
    pub fn as_one(&self) -> Option<&T> {
        self.0.as_ref().left()
    }

    /// Take a single value
    ///
    /// ```rust
    /// # use activitystreams_new::primitives::OneOrMany;
    /// # let value = OneOrMany::from_one(1);
    /// if let Some(v) = value.one() {
    ///     println!("{:?}", v);
    /// }
    /// ```
    pub fn one(self) -> Option<T> {
        self.0.left()
    }

    /// Get a slice of values
    ///
    /// ```rust
    /// # use activitystreams_new::primitives::OneOrMany;
    /// # let value = OneOrMany::from_many(vec![1, 2, 3]);
    /// if let Some(v) = value.as_many() {
    ///     for item in v.iter() {
    ///         println!("{:?}", item);
    ///     }
    /// }
    /// ```
    pub fn as_many(&self) -> Option<&[T]> {
        self.0.as_ref().right().map(|v| v.as_ref())
    }

    /// Take a Vec of values
    ///
    /// ```rust
    /// # use activitystreams_new::primitives::OneOrMany;
    /// # let value = OneOrMany::from_many(vec![1, 2, 3]);
    /// if let Some(v) = value.many() {
    ///     for item in v.into_iter() {
    ///         println!("{:?}", item);
    ///     }
    /// }
    /// ```
    pub fn many(self) -> Option<Vec<T>> {
        self.0.right()
    }

    /// Consume the type, returning a vec
    ///
    /// ```rust
    /// # use activitystreams_new::primitives::OneOrMany;
    /// # let value = OneOrMany::from_many(vec![1, 2, 3]);
    /// for item in value.unwrap_to_vec() {
    ///     println!("{:?}", item);
    /// }
    /// ```
    pub fn unwrap_to_vec(self) -> Vec<T> {
        match self.0 {
            Either::Left(t) => vec![t],
            Either::Right(v) => v,
        }
    }

    /// Produce a new object from one value
    ///
    /// ```
    /// use activitystreams_new::primitives::OneOrMany;
    /// let v = OneOrMany::from_one(1234);
    /// ```
    pub fn from_one(t: T) -> Self {
        OneOrMany(Either::Left(t))
    }

    /// Produce a new object from a vec of values
    ///
    /// ```
    /// use activitystreams_new::primitives::OneOrMany;
    /// let v = OneOrMany::from_many(vec![1, 2, 3, 4]);
    /// ```
    pub fn from_many(items: Vec<T>) -> Self {
        OneOrMany(Either::Right(items))
    }

    /// Overwrite the contents with a single value
    ///
    /// ```
    /// # use activitystreams_new::primitives::OneOrMany;
    /// # let mut value = OneOrMany::from_many(vec![1, 2, 3]);
    /// value.set_one(3);
    ///
    /// assert!(value.as_one().is_some());
    /// ```
    pub fn set_one<U>(&mut self, u: U) -> &mut Self
    where
        U: Into<T>,
    {
        self.0 = Either::Left(u.into());
        self
    }

    /// Overwrite the contents with vec of values
    ///
    /// ```
    /// # use activitystreams_new::primitives::OneOrMany;
    /// # let mut value = OneOrMany::from_one(1234);
    /// value.set_many(vec![1, 2, 3, 4]);
    ///
    /// assert!(value.as_many().is_some());
    /// ```
    pub fn set_many<U>(&mut self, items: impl IntoIterator<Item = U>) -> &mut Self
    where
        U: Into<T>,
    {
        self.0 = Either::Right(items.into_iter().map(Into::into).collect());
        self
    }

    /// Add a value to the object
    ///
    /// This appends the value to the existing vec, or converts the single value into a vec, and
    /// then appends the new value
    ///
    /// ```
    /// use activitystreams_new::primitives::OneOrMany;
    /// let mut value = OneOrMany::from_one(1234);
    /// value.add(4321);
    ///
    /// assert!(value.as_many().is_some());
    /// ```
    pub fn add<U>(&mut self, u: U) -> &mut Self
    where
        U: Into<T>,
    {
        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
    }

    /// Add many values to the object
    ///
    /// This appends the values to the existing vec, or converts the single value into a vec, and
    /// then appends the new values
    ///
    /// ```
    /// use activitystreams_new::primitives::OneOrMany;
    /// let mut value = OneOrMany::from_one(1234);
    /// value.add_many(vec![4321, 2345]);
    ///
    /// assert!(value.as_many().is_some());
    /// ```
    pub fn add_many<U>(&mut self, items: impl IntoIterator<Item = U>) -> &mut Self
    where
        U: Into<T>,
    {
        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(Into::into));
        self.0 = Either::Right(v);
        self
    }
}

impl Unit {
    /// Create a new unit measuring Centimeters
    ///
    /// ```rust
    /// use activitystreams_new::primitives::Unit;
    ///
    /// Unit::centimeters();
    /// ```
    pub fn centimeters() -> Self {
        Unit(Either::Left(Length::Centimeters))
    }

    /// Check if the unit is Centimeters
    ///
    /// ```rust
    /// use activitystreams_new::primitives::Unit;
    ///
    /// assert!(Unit::centimeters().is_centimeters());
    /// ```
    pub fn is_centimeters(&self) -> bool {
        self.0
            .as_ref()
            .left()
            .map(|l| l.is_centimeters())
            .unwrap_or(false)
    }

    /// Create a new unit measuring Meters
    ///
    /// ```rust
    /// use activitystreams_new::primitives::Unit;
    ///
    /// Unit::meters();
    /// ```
    pub fn meters() -> Self {
        Unit(Either::Left(Length::Meters))
    }

    /// Check if the unit is Meters
    ///
    /// ```rust
    /// use activitystreams_new::primitives::Unit;
    ///
    /// assert!(Unit::meters().is_meters());
    /// ```
    pub fn is_meters(&self) -> bool {
        self.0
            .as_ref()
            .left()
            .map(|l| l.is_meters())
            .unwrap_or(false)
    }

    /// Create a new unit measuring Kilometers
    ///
    /// ```rust
    /// use activitystreams_new::primitives::Unit;
    ///
    /// Unit::kilometers();
    /// ```
    pub fn kilometers() -> Self {
        Unit(Either::Left(Length::Kilometers))
    }

    /// Check if the unit is Kilometers
    ///
    /// ```rust
    /// use activitystreams_new::primitives::Unit;
    ///
    /// assert!(Unit::kilometers().is_kilometers());
    /// ```
    pub fn is_kilometers(&self) -> bool {
        self.0
            .as_ref()
            .left()
            .map(|l| l.is_kilometers())
            .unwrap_or(false)
    }

    /// Create a new unit measuring Feet
    ///
    /// ```rust
    /// use activitystreams_new::primitives::Unit;
    ///
    /// Unit::feet();
    /// ```
    pub fn feet() -> Self {
        Unit(Either::Left(Length::Feet))
    }

    /// Check if the unit is Feet
    ///
    /// ```rust
    /// use activitystreams_new::primitives::Unit;
    ///
    /// assert!(Unit::feet().is_feet());
    /// ```
    pub fn is_feet(&self) -> bool {
        self.0.as_ref().left().map(|l| l.is_feet()).unwrap_or(false)
    }

    /// Create a new unit measuring Inches
    ///
    /// ```rust
    /// use activitystreams_new::primitives::Unit;
    ///
    /// Unit::inches();
    /// ```
    pub fn inches() -> Self {
        Unit(Either::Left(Length::Inches))
    }

    /// Check if the unit is Inches
    ///
    /// ```rust
    /// use activitystreams_new::primitives::Unit;
    ///
    /// assert!(Unit::inches().is_inches());
    /// ```
    pub fn is_inches(&self) -> bool {
        self.0
            .as_ref()
            .left()
            .map(|l| l.is_inches())
            .unwrap_or(false)
    }

    /// Create a new custom unit
    ///
    /// ```rust
    /// use activitystreams_new::primitives::Unit;
    ///
    /// Unit::custom("Yards");
    /// ```
    pub fn custom<T>(string: T) -> Self
    where
        T: Into<String>,
    {
        Unit(Either::Right(string.into()))
    }

    /// Check if a unit is custom
    ///
    /// ```rust
    /// use activitystreams_new::primitives::Unit;
    ///
    /// assert!(Unit::custom("Yards").is_custom());
    /// ```
    pub fn is_custom(&self) -> bool {
        self.as_custom().is_some()
    }

    /// Fetch a custom unit
    ///
    /// ```rust
    /// use activitystreams_new::primitives::Unit;
    ///
    /// assert!(Unit::custom("Yards").as_custom() == Some("Yards"));
    /// ```
    pub fn as_custom(&self) -> Option<&str> {
        self.0.as_ref().right().map(|r| r.as_str())
    }
}

impl Default for Unit {
    fn default() -> Self {
        Self::meters()
    }
}

impl std::str::FromStr for Unit {
    type Err = std::convert::Infallible;

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        let unit = match s {
            "cm" => Self::centimeters(),
            "m" => Self::meters(),
            "km" => Self::kilometers(),
            "inches" => Self::inches(),
            "feet" => Self::feet(),
            other => Self::custom(other),
        };

        Ok(unit)
    }
}

impl From<String> for Unit {
    fn from(s: String) -> Self {
        match s.parse() {
            Ok(u) => u,
            Err(e) => match e {},
        }
    }
}

impl From<&str> for Unit {
    fn from(s: &str) -> Self {
        match s.parse() {
            Ok(u) => u,
            Err(e) => match e {},
        }
    }
}

impl<T> From<T> for OneOrMany<T> {
    fn from(t: T) -> Self {
        OneOrMany::from_one(t)
    }
}

impl<T> From<Vec<T>> for OneOrMany<T> {
    fn from(t: Vec<T>) -> Self {
        OneOrMany::from_many(t)
    }
}

impl From<&str> for AnyString {
    fn from(s: &str) -> Self {
        AnyString::from_xsd_string(s.to_owned())
    }
}

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

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

impl From<&str> for OneOrMany<AnyString> {
    fn from(s: &str) -> Self {
        OneOrMany::<AnyString>::from_xsd_string(s.to_owned())
    }
}

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