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//! # pngcrush
//!
//! `pngcrush` is a library for [PNG Crush](https://pngcrush.com)'s HTTP API.

extern crate reqwest;

use std::error::Error;
use std::path::Path;

/// Returns raw byte data of a crushed version of the PNG located at the given path
///
/// # Arguments
///
/// * `path` - a path-like object which points to the PNG to crush
///
/// # Examples
///
/// ```
/// use std::io::Write as _;
/// let data = pngcrush::crush("examples/uncrushed.png").unwrap();
/// let mut buffer = std::fs::File::create("examples/crushed.png").unwrap();
/// buffer.write_all(&data).unwrap();
/// ```
///
/// # Errors
///
/// This function will return an Err if:
/// * The given path is invalid
/// * There is an error reading the path's contents
/// * There is an error while sending the HTTP request
/// * There is an error copying the response data into the output buffer
///
pub fn crush<P: AsRef<Path>>(path: P) -> Result<Vec<u8>, Box<dyn Error>> {
    let form = reqwest::multipart::Form::new().file("input", path)?;

    let mut buffer = Vec::new();

    reqwest::Client::new()
        .post("https://pngcrush.com/crush")
        .multipart(form)
        .send()?
        .copy_to(&mut buffer)?;

    Ok(buffer)
}