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// Copyright © 2015 by Michael Dilger (of New Zealand)
// This code is licensed under the MIT license (see LICENSE-MIT for details)

use mime_multipart::{Node, Part, FilePart};
use hyper::header::{Headers, ContentDisposition, DispositionParam, DispositionType,
                    ContentType};
use mime::{Mime, TopLevel, SubLevel};
use error::Error;

/// The extracted text fields and uploaded files from a `multipart/form-data` request.
///
/// Use `parse_multipart` to devise this object from a request.
#[derive(Clone, Debug, PartialEq)]
pub struct FormData {
    /// Name-value pairs for plain text fields. Technically, these are form data parts with no
    /// filename specified in the part's `Content-Disposition`.
    pub fields: Vec<(String, String)>,
    /// Name-value pairs for temporary files. Technically, these are form data parts with a filename
    /// specified in the part's `Content-Disposition`.
    pub files: Vec<(String, FilePart)>,
}

impl FormData {
    pub fn new() -> FormData {
        FormData { fields: vec![], files: vec![] }
    }

    /// Create a mime-multipart Vec<Node> from this FormData
    pub fn to_multipart(&self) -> Result<Vec<Node>, Error> {
        // Translate to Nodes
        let mut nodes: Vec<Node> = Vec::with_capacity(self.fields.len() + self.files.len());

        for &(ref name, ref value) in &self.fields {
            let mut h = Headers::new();
            h.set(ContentType(Mime(TopLevel::Text, SubLevel::Plain, vec![])));
            h.set(ContentDisposition {
                disposition: DispositionType::Ext("form-data".to_owned()),
                parameters: vec![DispositionParam::Ext("name".to_owned(), name.clone())],
            });
            nodes.push( Node::Part( Part {
                headers: h,
                body: value.as_bytes().to_owned(),
            }));
        }

        for &(ref name, ref filepart) in &self.files {
            let mut filepart = filepart.clone();
            // We leave all headers that the caller specified, except that we rewrite
            // Content-Disposition.
            while filepart.headers.remove::<ContentDisposition>() { };
            let filename = match filepart.path.file_name() {
                Some(fname) => fname.to_string_lossy().into_owned(),
                None => return Err(Error::NotAFile),
            };
            filepart.headers.set(ContentDisposition {
                disposition: DispositionType::Ext("form-data".to_owned()),
                parameters: vec![DispositionParam::Ext("name".to_owned(), name.clone()),
                                 DispositionParam::Ext("filename".to_owned(), filename)],
            });
            nodes.push( Node::File( filepart ) );
        }

        Ok(nodes)
    }
}