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use std::borrow::BorrowMut;
use std::ops::{Deref, DerefMut};
use std::slice::IterMut;
use bson::{Binary, Bson, Document};
use bson::spec::BinarySubtype;
use serde::{Deserializer, Serialize, Serializer};
use serde::de::{DeserializeOwned, Error, Expected};
use serde_json::ser::Formatter;
use serde_json::Value;
use crate::types::{BINARY_SUBTYPE_JSON};

/// Json
#[derive(Clone, Copy, Eq, Hash, Ord, PartialEq, PartialOrd)]
pub struct Json<T> where T: Serialize {
    pub inner: T,
}

impl<T> From<T> for Json<T> where T: Serialize {
    fn from(arg: T) -> Self {
        Self {
            inner: arg
        }
    }
}

impl<T> From<&T> for Json<T> where T: Serialize + Clone {
    fn from(arg: &T) -> Self {
        Self {
            inner: arg.clone()
        }
    }
}


impl<T: Serialize> serde::Serialize for Json<T> {
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> where S: Serializer {
        return Binary {
            subtype: BinarySubtype::UserDefined(BINARY_SUBTYPE_JSON),
            bytes: serde_json::to_vec(&self.inner).unwrap_or_default(),
        }.serialize(serializer);
    }
}

fn to_save_json(b: Bson) -> serde_json::Value {
    match b {
        Bson::Array(arr) => {
            let mut vec = Vec::with_capacity(arr.capacity());
            for x in arr {
                vec.push(to_save_json(x));
            }
            return serde_json::Value::Array(vec);
        }
        Bson::Document(doc) => {
            let mut m = serde_json::Map::with_capacity(doc.len());
            for (k, v) in doc {
                m.insert(k, to_save_json(v));
            }
            return serde_json::Value::Object(m);
        }
        Bson::Decimal128(d) => { return serde_json::Value::String(d.to_string()); }
        _ => {
            return to_save_json(b);
        }
    }
}

impl<'de, T> serde::Deserialize<'de> for Json<T> where T: Serialize + DeserializeOwned {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> where D: Deserializer<'de> {
        let mut b = Bson::deserialize(deserializer)?;
        match b {
            Bson::String(s) => {
                return Ok(Self {
                    inner: serde_json::from_str(&s).or_else(|e| Err(D::Error::custom(e.to_string())))?,
                });
            }
            Bson::Binary(data) => {
                let v = serde_json::from_slice::<T>(&data.bytes).or_else(|e| Err(D::Error::custom(e.to_string())))?;
                Ok(Json {
                    inner: v,
                })
            }
            Bson::Decimal128(v) => {
                let v = serde_json::from_value::<T>(serde_json::Value::String(v.to_string())).or_else(|e| Err(D::Error::custom(e.to_string())))?;
                Ok(Json {
                    inner: v,
                })
            }
            _ => {
                let v = serde_json::from_value::<T>(b.into_canonical_extjson()).or_else(|e| Err(D::Error::custom(e.to_string())))?;
                Ok(Json {
                    inner: v,
                })
            }
        }
    }
}

impl<T: Serialize> std::fmt::Display for Json<T> where T: std::fmt::Display {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        self.inner.fmt(f)
    }
}

impl<T: Serialize> std::fmt::Debug for Json<T> where T: std::fmt::Debug {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        self.inner.fmt(f)
    }
}

impl<T: Serialize> Json<T> {
    pub fn to_string(&self) -> String where T: std::fmt::Display {
        self.inner.to_string()
    }
}

impl<T: Serialize> Deref for Json<T> {
    type Target = T;

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

impl<T: Serialize> DerefMut for Json<T> {
    fn deref_mut(&mut self) -> &mut Self::Target {
        &mut self.inner
    }
}

impl<T> Json<T> where T: Serialize {
    pub fn from_value(arg: Value) -> Self where T: Serialize + DeserializeOwned + Default {
        Json {
            inner: serde_json::from_value(arg).unwrap_or_default()
        }
    }
}

impl<T> Json<T> where T: Serialize + DeserializeOwned {
    /// create from str
    pub fn from_str(arg: &str) -> Result<Self, crate::error::Error> {
        let inner = serde_json::from_str(arg)?;
        Ok(Self {
            inner: inner
        })
    }
}


#[cfg(test)]
mod test {
    use crate::types::Json;

    #[test]
    fn test_ser_de() {
        let b = Json {
            inner: 1
        };
        let bsons = bson::to_bson(&b).unwrap();
        let b_de: Json<i32> = bson::from_bson(bsons).unwrap();
        assert_eq!(b, b_de);
    }
}