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extern crate rusqlite;
extern crate serde;

use super::{Error, NamedParamSlice, Result};
use super::tosql::ToSqlSerializer;
use self::serde::ser;

/// Serializer into `NamedParamSlice`
///
/// You shouldn't use it directly, but via the crate's `to_params_named()` function. Check the crate documentation for example.
pub struct NamedSliceSerializer(pub NamedParamSlice);

impl NamedSliceSerializer {
	pub fn new() -> Self {
		NamedSliceSerializer(NamedParamSlice::from(Vec::new()))
	}
}

impl ser::Serializer for NamedSliceSerializer {
	type Ok = NamedParamSlice;
	type Error = Error;
	type SerializeSeq = ser::Impossible<Self::Ok, Self::Error>;
	type SerializeTuple = ser::Impossible<Self::Ok, Self::Error>;
	type SerializeTupleStruct = ser::Impossible<Self::Ok, Self::Error>;
	type SerializeTupleVariant = ser::Impossible<Self::Ok, Self::Error>;
	type SerializeMap = Self;
	type SerializeStruct = Self;
	type SerializeStructVariant = Self;

	fn serialize_some<T: ? Sized + serde::Serialize>(self, value: &T) -> Result<Self::Ok> {
		value.serialize(self)
	}

	fn serialize_unit_variant(self, _name: &'static str, _variant_index: u32, variant: &'static str) -> Result<Self::Ok> {
		self.serialize_str(variant)
	}

	fn serialize_newtype_struct<T: ? Sized + serde::Serialize>(self, _name: &'static str, value: &T) -> Result<Self::Ok> {
		value.serialize(self)
	}

	fn serialize_newtype_variant<T: ? Sized + serde::Serialize>(self, _name: &'static str, _variant_index: u32, _variant: &'static str, value: &T) -> Result<Self::Ok> {
		value.serialize(self)
	}

	fn serialize_map(mut self, len: Option<usize>) -> Result<Self::SerializeMap> {
		len.map(|len| self.0.reserve_exact(len));
		Ok(self)
	}

	fn serialize_struct(mut self, _name: &'static str, len: usize) -> Result<Self::SerializeStruct> {
		self.0.reserve_exact(len);
		Ok(self)
	}

	fn serialize_struct_variant(mut self, _name: &'static str, _variant_index: u32, _variant: &'static str, len: usize) -> Result<Self::SerializeStructVariant> {
		self.0.reserve_exact(len);
		Ok(self)
	}

	ser_unimpl!(serialize_bool, bool);
	ser_unimpl!(serialize_i8, i8);
	ser_unimpl!(serialize_i16, i16);
	ser_unimpl!(serialize_i32, i32);
	ser_unimpl!(serialize_i64, i64);
	ser_unimpl!(serialize_u8, u8);
	ser_unimpl!(serialize_u16, u16);
	ser_unimpl!(serialize_u32, u32);
	ser_unimpl!(serialize_u64, u64);
	ser_unimpl!(serialize_f32, f32);
	ser_unimpl!(serialize_f64, f64);
	ser_unimpl!(serialize_str, &str);
	ser_unimpl!(serialize_char, char);
	ser_unimpl!(serialize_bytes, &[u8]);

	fn serialize_none(self) -> Result<Self::Ok> { Err(Error::ser_unsupported("None")) }
	fn serialize_unit(self) -> Result<Self::Ok> { Err(Error::ser_unsupported("()")) }
	fn serialize_unit_struct(self, _name: &'static str) -> Result<Self::Ok> { Err(Error::ser_unsupported("unit_struct")) }
	fn serialize_seq(self, _len: Option<usize>) -> Result<Self::SerializeSeq> { Err(Error::ser_unsupported("seq")) }
	fn serialize_tuple(self, _len: usize) -> Result<Self::SerializeTuple> { Err(Error::ser_unsupported("tuple")) }
	fn serialize_tuple_struct(self, _name: &'static str, _len: usize) -> Result<Self::SerializeTupleStruct> { Err(Error::ser_unsupported("tuple_struct")) }
	fn serialize_tuple_variant(self, _name: &'static str, _variant_index: u32, _variant: &'static str, _len: usize) -> Result<Self::SerializeTupleVariant> { Err(Error::ser_unsupported("tuple_variant")) }
}

impl ser::SerializeMap for NamedSliceSerializer {
	type Ok = NamedParamSlice;
	type Error = Error;

	fn serialize_key<T: ? Sized + serde::Serialize>(&mut self, key: &T) -> Result<()> {
		self.0.push((format!(":{}", key.serialize(ColumNameSerializer)?), Box::new(0)));
		Ok(())
	}

	fn serialize_value<T: ? Sized + serde::Serialize>(&mut self, value: &T) -> Result<()> {
		self.0.last_mut().unwrap().1 = value.serialize(ToSqlSerializer)?;
		Ok(())
	}

	fn end(self) -> Result<Self::Ok> {
		Ok(self.0)
	}
}

impl ser::SerializeStruct for NamedSliceSerializer {
	type Ok = NamedParamSlice;
	type Error = Error;

	fn serialize_field<T: ? Sized + serde::Serialize>(&mut self, key: &'static str, value: &T) -> Result<()> {
		self.0.push((format!(":{}", key), value.serialize(ToSqlSerializer)?));
		Ok(())
	}

	fn end(self) -> Result<Self::Ok> {
		Ok(self.0)
	}
}

impl ser::SerializeStructVariant for NamedSliceSerializer {
	type Ok = NamedParamSlice;
	type Error = Error;

	fn serialize_field<T: ? Sized + serde::Serialize>(&mut self, key: &'static str, value: &T) -> Result<()> {
		self.0.push((format!(":{}", key), value.serialize(ToSqlSerializer)?));
		Ok(())
	}

	fn end(self) -> Result<Self::Ok> {
		Ok(self.0)
	}
}

struct ColumNameSerializer;

impl ser::Serializer for ColumNameSerializer {
	type Ok = String;
	type Error = Error;
	type SerializeSeq = ser::Impossible<Self::Ok, Self::Error>;
	type SerializeTuple = ser::Impossible<Self::Ok, Self::Error>;
	type SerializeTupleStruct = ser::Impossible<Self::Ok, Self::Error>;
	type SerializeTupleVariant = ser::Impossible<Self::Ok, Self::Error>;
	type SerializeMap = ser::Impossible<Self::Ok, Self::Error>;
	type SerializeStruct = ser::Impossible<Self::Ok, Self::Error>;
	type SerializeStructVariant = ser::Impossible<Self::Ok, Self::Error>;

	fn serialize_char(self, v: char) -> Result<Self::Ok> {
		Ok(v.to_string())
	}

	fn serialize_str(self, v: &str) -> Result<Self::Ok> {
		Ok(v.into())
	}

	ser_unimpl!(serialize_bool, bool);
	ser_unimpl!(serialize_i8, i8);
	ser_unimpl!(serialize_i16, i16);
	ser_unimpl!(serialize_i32, i32);
	ser_unimpl!(serialize_i64, i64);
	ser_unimpl!(serialize_u8, u8);
	ser_unimpl!(serialize_u16, u16);
	ser_unimpl!(serialize_u32, u32);
	ser_unimpl!(serialize_u64, u64);
	ser_unimpl!(serialize_f32, f32);
	ser_unimpl!(serialize_f64, f64);
	ser_unimpl!(serialize_bytes, &[u8]);

	fn serialize_none(self) -> Result<Self::Ok> { Err(Error::ser_unsupported("None")) }
	fn serialize_some<T: ? Sized + serde::Serialize>(self, _value: &T) -> Result<Self::Ok> { Err(Error::ser_unsupported("Some")) }
	fn serialize_unit(self) -> Result<Self::Ok> { Err(Error::ser_unsupported("()")) }
	fn serialize_unit_struct(self, _name: &'static str) -> Result<Self::Ok> { Err(Error::ser_unsupported("unit_struct")) }
	fn serialize_unit_variant(self, _name: &'static str, _variant_index: u32, _variant: &'static str) -> Result<Self::Ok> { Err(Error::ser_unsupported("unit_variant")) }
	fn serialize_newtype_struct<T: ? Sized + serde::Serialize>(self, _name: &'static str, _value: &T) -> Result<Self::Ok> { Err(Error::ser_unsupported("newtype_struct")) }
	fn serialize_newtype_variant<T: ? Sized + serde::Serialize>(self, _name: &'static str, _variant_index: u32, _variant: &'static str, _value: &T) -> Result<Self::Ok> { Err(Error::ser_unsupported("newtype_variant")) }
	fn serialize_seq(self, _len: Option<usize>) -> Result<Self::SerializeSeq> { Err(Error::ser_unsupported("seq")) }
	fn serialize_tuple(self, _len: usize) -> Result<Self::SerializeTuple> { Err(Error::ser_unsupported("tuple")) }
	fn serialize_tuple_struct(self, _name: &'static str, _len: usize) -> Result<Self::SerializeTupleStruct> { Err(Error::ser_unsupported("tuple_struct")) }
	fn serialize_tuple_variant(self, _name: &'static str, _variant_index: u32, _variant: &'static str, _len: usize) -> Result<Self::SerializeTupleVariant> { Err(Error::ser_unsupported("type_variant")) }
	fn serialize_map(self, _len: Option<usize>) -> Result<Self::SerializeMap> { Err(Error::ser_unsupported("map")) }
	fn serialize_struct(self, _name: &'static str, _len: usize) -> Result<Self::SerializeStruct> { Err(Error::ser_unsupported("struct")) }
	fn serialize_struct_variant(self, _name: &'static str, _variant_index: u32, _variant: &'static str, _len: usize) -> Result<Self::SerializeStructVariant> { Err(Error::ser_unsupported("struct_variant")) }
}