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// Copyright (c) Cole Frederick. All rights reserved.
// The use and distribution terms for this software are covered by the
// Eclipse Public License 1.0 (https://opensource.org/licenses/eclipse-1.0.php)
// which can be found in the file epl-v10.html at the root of this distribution.
// By using this software in any fashion, you are agreeing to be bound by the terms of this license.
// You must not remove this notice, or any other, from this software.

use super::*;
use std::str::FromStr;
use edn::reader::{EdnReader, ReadResult};
use edn;
use character;
use integral;
use float_point;
use string;

impl From<bool> for Value {
    fn from(x: bool) -> Value { if x { Handle::tru().value() } else { Handle::fals().value() } }
}
impl Into<bool> for Value { fn into(self) -> bool { (&self).into() } }
impl Into<bool> for &Value { fn into(self) -> bool { self.handle().is_so() } }
impl From<char> for Value { fn from(x: char) -> Self { character::new(x).value() } }
impl Into<char> for Value {
    fn into(self) -> char {
        let h = self._consume();
        if let Some(prism) = character::find_prism(h) {
            let c = character::as_char(prism);
            h.retire();
            c
        } else {
            unimplemented!("Converting {} into a char.", h);
        }
    }
}
impl From<i64> for Value { fn from(x: i64) -> Self { integral::new_value(x) } }
impl From<i32> for Value { fn from(x: i32) -> Self { Value::from(x as i64) } }
impl From<i16> for Value { fn from(x: i16) -> Self { Value::from(x as i64) } }
impl From<i8> for Value { fn from(x: i8) -> Self { Value::from(x as i64) } }
impl From<isize> for Value { fn from(x: isize) -> Self { Value::from(x as i64) } }
impl From<u64> for Value { fn from(x: u64) -> Self { Value::from(x as i64) } }
impl From<u32> for Value { fn from(x: u32) -> Self { Value::from(x as i64) } }
impl From<u16> for Value { fn from(x: u16) -> Self { Value::from(x as i64) } }
impl From<u8> for Value { fn from(x: u8) -> Self { Value::from(x as i64) } }
impl From<usize> for Value { fn from(x: usize) -> Self { Value::from(x as i64) } }
impl From<f64> for Value { fn from(x: f64) -> Self { float_point::new(x).handle().value() } }
impl From<f32> for Value { fn from(x: f32) -> Self { Value::from(x as f64) } }
impl From<&str> for Value { fn from(s: &str) -> Self { string::new_value_from_str(s) } }
/// Parse a value from a string of edn data.
///
/// # Examples
///
/// ```
/// # use fress::*;
/// let x: Value = "[1 2 3 4]".parse().unwrap();
/// assert_eq!(x.count(), 4);
/// ```
impl FromStr for Value {
    type Err = String;
    fn from_str(s: &str) -> Result<Self, Self::Err> {
        //group!("Read edn from {:?}", s);
        let b = s.as_bytes();
        let mut reader = EdnReader::new();
        let ret = match edn::read(&mut reader, b) {
            ReadResult::Ok { value, .. } => {
                Ok(value.handle().value())
            },
            ReadResult::NeedMore { bytes_not_used } => {
                let trailing_space = {
                    let mut v = Vec::new();
                    let i = b.len() - bytes_not_used as usize;
                    v.extend_from_slice(&b[i..]);
                    v.push(0x20u8);
                    v
                };
                match edn::read(&mut reader, &trailing_space[..]) {
                    ReadResult::Ok { value, .. } => {
                        Ok(value.handle().value())
                    },
                    ReadResult::NeedMore { .. } => {
                        Err(format!("Incomplete edn element: {:?}", s))
                    },
                    ReadResult::Error { location, message } => {
                        Err(format!("{:?} {}", location, message))
                    },
                }
            },
            ReadResult::Error { location, message } => {
                Err(format!("{:?} {}", location, message))
            },
        };
        //group_end!();
        ret
    }
}

impl<T: Into<Value>> From<Option<T>> for Value {
    fn from(option: Option<T>) -> Value {
        match option {
            Some(t) => t.into(),
            None    => Handle::nil().value(),
        }
    }
}

// vector, array, slice
impl<T: Into<Value>> From<Vec<T>> for Value {
    fn from(val: Vec<T>) -> Value {
        use vector;
        let mut v = vector::new_value();
        for x in val.into_iter() {
            v = v.conj(x.into());
        }
        v
    }
}

// tuples
/*
impl<A, B> From<(A, B)> for Value {
    fn from(x: (A, B)) -> Self {
        unimplemented!()
    }
}
*/

#[cfg(test)]
mod test {
    use super::*;
    #[test]
    fn bool_roundtrip() {
        let x = true;
        assert_eq!(x, Value::from(x).into());
        let x = false;
        assert_eq!(x, Value::from(x).into());
    }
    #[test]
    fn char_roundtrip() {
        let x = 'λ';
        assert_eq!(x, Value::from(x).into());
    }
    #[test]
    fn option_roundtrip() {
        let x: Option<char> = None;
        assert!(Value::from(x).is_nil());
        let x = Some('λ');
        assert_eq!('λ', Value::from(x).into());
    }
}