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use std::fmt;
use async_std::io::{Read, Write};
use crate::{Error};
use crate::utils::{read_chunked_stream, read_sized_stream};

pub struct Body {
    bytes: Vec<u8>,
    length: usize,
    length_limit: Option<usize>,
}

impl Body {

    pub fn new() -> Self {
        Self {
            bytes: Vec::new(),
            length: 0,
            length_limit: None,
        }
    }

    pub fn bytes(&self) -> &Vec<u8> {
        &self.bytes
    }

    pub fn length(&self) -> usize {
        self.length
    }

    pub fn length_limit(&self) -> Option<usize> {
        self.length_limit
    }

    pub fn has_length_limit(&self) -> bool {
        self.length_limit.is_some()
    }

    pub fn set_length_limit(&mut self, limit: usize) {
        self.length_limit = Some(limit);
    }

    pub fn remove_length_limit(&mut self) {
        self.length_limit = None;
    }

    pub async fn read_chunked_stream<I>(&mut self, stream: &mut I) -> Result<usize, Error>
        where
        I: Write + Read + Unpin,
    {
        let limit = match self.length_limit {
            Some(limit) => match limit == 0 {
                true => return Err(Error::SizeLimitExceeded(limit)),
                false => Some(limit - self.length),
            },
            None => None,
        };
        
        let length = read_chunked_stream(stream, &mut self.bytes, limit).await?;
        self.length += length;

        Ok(length)
    }
    
    pub async fn read_sized_stream<I>(&mut self, stream: &mut I, length: usize) -> Result<usize, Error>
        where
        I: Write + Read + Unpin,
    {
        match self.length_limit {
            Some(limit) => match length + self.length > limit {
                true => return Err(Error::SizeLimitExceeded(limit)),
                false => (),
            },
            None => (),
        };

        let length = read_sized_stream(stream, &mut self.bytes, length).await?;
        self.length += length;

        Ok(length)
    }

    pub async fn read_string<V: Into<String>>(&mut self, value: V) -> Result<usize, Error> {
        let mut bytes = value.into().as_bytes().to_vec();
    
        let length = bytes.len();
        match self.length_limit {
            Some(limit) => match length + self.length > limit {
                true => return Err(Error::SizeLimitExceeded(limit)),
                false => (),
            },
            None => (),
        };
    
        self.bytes.append(&mut bytes);
        self.length += length;
    
        Ok(length)
    }
    
    pub fn clear(&mut self) {
        self.bytes.clear();
        self.length = 0;
        self.length_limit = None;
    }
}

impl fmt::Display for Body {
    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
        write!(fmt, "{:?}", self.bytes())
    }
}