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use actix_web::http::header::{
    ContentDisposition as ActixContentDisposition, DispositionParam, DispositionType,
};
use actix_web::{error, Error as ActixError};
use std::convert::TryFrom;

/// Wrapper for Actix content disposition header.
///
/// Aims to parse the file data from multipart body.
///
/// e.g. `Content-Disposition: form-data; name="field_name"; filename="filename.jpg"`
pub struct ContentDisposition {
    inner: ActixContentDisposition,
}

impl TryFrom<Option<ActixContentDisposition>> for ContentDisposition {
    type Error = ActixError;
    fn try_from(content_disposition: Option<ActixContentDisposition>) -> Result<Self, Self::Error> {
        match content_disposition {
            Some(inner) => Ok(Self { inner }),
            None => Err(error::ErrorBadRequest("content disposition does not exist")),
        }
    }
}

impl ContentDisposition {
    /// Checks if the content disposition is a form data
    /// and has the field `field_name`.
    pub fn has_form_field(&self, field_name: &str) -> bool {
        self.inner.disposition == DispositionType::FormData
            && self
                .inner
                .parameters
                .contains(&DispositionParam::Name(field_name.to_string()))
    }

    /// Parses the file name from parameters if it exists.
    pub fn get_file_name(&self) -> Result<&str, ActixError> {
        self.inner
            .parameters
            .iter()
            .find(|param| param.is_filename())
            .map(|param| param.as_filename())
            .flatten()
            .filter(|file_name| !file_name.is_empty())
            .ok_or_else(|| error::ErrorBadRequest("file data not present"))
    }
}

#[cfg(test)]
mod test {
    use super::*;

    #[test]
    fn test_content_disposition() -> Result<(), ActixError> {
        assert!(ContentDisposition::try_from(None).is_err());

        let actix_content_disposition = Some(ActixContentDisposition {
            disposition: DispositionType::FormData,
            parameters: vec![
                DispositionParam::Name(String::from("file")),
                DispositionParam::Filename(String::from("x.txt")),
            ],
        });
        let content_disposition = ContentDisposition::try_from(actix_content_disposition)?;
        assert!(content_disposition.has_form_field("file"));
        assert!(!content_disposition.has_form_field("test"));
        assert_eq!("x.txt", content_disposition.get_file_name()?);

        let actix_content_disposition = Some(ActixContentDisposition {
            disposition: DispositionType::Attachment,
            parameters: vec![DispositionParam::Name(String::from("file"))],
        });
        let content_disposition = ContentDisposition::try_from(actix_content_disposition)?;
        assert!(!content_disposition.has_form_field("file"));
        assert!(content_disposition.get_file_name().is_err());
        Ok(())
    }
}