// Copyright (c) 2017 Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.

use xso::{text::EmptyAsError, AsXml, FromXml};

use crate::ns;

/// Represents an URI used in a media element.
#[derive(FromXml, AsXml, PartialEq, Debug, Clone)]
#[xml(namespace = ns::MEDIA_ELEMENT, name = "uri")]
pub struct Uri {
    /// The MIME type of the URI referenced.
    ///
    /// See the [IANA MIME Media Types Registry][1] for a list of
    /// registered types, but unregistered or yet-to-be-registered are
    /// accepted too.
    ///
    /// [1]: <https://www.iana.org/assignments/media-types/media-types.xhtml>
    #[xml(attribute(name = "type"))]
    pub type_: String,

    /// The actual URI contained.
    #[xml(text(codec = EmptyAsError))]
    pub uri: String,
}

/// References a media element, to be used in [data
/// forms](../data_forms/index.html).
#[derive(FromXml, AsXml, PartialEq, Debug, Clone)]
#[xml(namespace = ns::MEDIA_ELEMENT, name = "media")]
pub struct MediaElement {
    /// The recommended display width in pixels.
    #[xml(attribute(default))]
    pub width: Option<usize>,

    /// The recommended display height in pixels.
    #[xml(attribute(default))]
    pub height: Option<usize>,

    /// A list of URIs referencing this media.
    #[xml(child(n = ..))]
    pub uris: Vec<Uri>,
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::data_forms::DataForm;
    use minidom::Element;
    use xso::error::{Error, FromElementError};

    #[cfg(target_pointer_width = "32")]
    #[test]
    fn test_size() {
        assert_size!(Uri, 24);
        assert_size!(MediaElement, 28);
    }

    #[cfg(target_pointer_width = "64")]
    #[test]
    fn test_size() {
        assert_size!(Uri, 48);
        assert_size!(MediaElement, 56);
    }

    #[test]
    fn test_simple() {
        let elem: Element = "<media xmlns='urn:xmpp:media-element'/>".parse().unwrap();
        let media = MediaElement::try_from(elem).unwrap();
        assert!(media.width.is_none());
        assert!(media.height.is_none());
        assert!(media.uris.is_empty());
    }

    #[test]
    fn test_width_height() {
        let elem: Element = "<media xmlns='urn:xmpp:media-element' width='32' height='32'/>"
            .parse()
            .unwrap();
        let media = MediaElement::try_from(elem).unwrap();
        assert_eq!(media.width.unwrap(), 32);
        assert_eq!(media.height.unwrap(), 32);
    }

    #[test]
    fn test_uri() {
        let elem: Element = "<media xmlns='urn:xmpp:media-element'><uri type='text/html'>https://example.org/</uri></media>".parse().unwrap();
        let media = MediaElement::try_from(elem).unwrap();
        assert_eq!(media.uris.len(), 1);
        assert_eq!(media.uris[0].type_, "text/html");
        assert_eq!(media.uris[0].uri, "https://example.org/");
    }

    #[test]
    fn test_invalid_width_height() {
        let elem: Element = "<media xmlns='urn:xmpp:media-element' width=''/>"
            .parse()
            .unwrap();
        let error = MediaElement::try_from(elem).unwrap_err();
        let error = match error {
            FromElementError::Invalid(Error::TextParseError(error))
                if error.is::<std::num::ParseIntError>() =>
            {
                error
            }
            _ => panic!(),
        };
        assert_eq!(error.to_string(), "cannot parse integer from empty string");

        let elem: Element = "<media xmlns='urn:xmpp:media-element' width='coucou'/>"
            .parse()
            .unwrap();
        let error = MediaElement::try_from(elem).unwrap_err();
        let error = match error {
            FromElementError::Invalid(Error::TextParseError(error))
                if error.is::<std::num::ParseIntError>() =>
            {
                error
            }
            _ => panic!(),
        };
        assert_eq!(error.to_string(), "invalid digit found in string");

        let elem: Element = "<media xmlns='urn:xmpp:media-element' height=''/>"
            .parse()
            .unwrap();
        let error = MediaElement::try_from(elem).unwrap_err();
        let error = match error {
            FromElementError::Invalid(Error::TextParseError(error))
                if error.is::<std::num::ParseIntError>() =>
            {
                error
            }
            _ => panic!(),
        };
        assert_eq!(error.to_string(), "cannot parse integer from empty string");

        let elem: Element = "<media xmlns='urn:xmpp:media-element' height='-10'/>"
            .parse()
            .unwrap();
        let error = MediaElement::try_from(elem).unwrap_err();
        let error = match error {
            FromElementError::Invalid(Error::TextParseError(error))
                if error.is::<std::num::ParseIntError>() =>
            {
                error
            }
            _ => panic!(),
        };
        assert_eq!(error.to_string(), "invalid digit found in string");
    }

    #[test]
    fn test_unknown_child() {
        let elem: Element = "<media xmlns='urn:xmpp:media-element'><coucou/></media>"
            .parse()
            .unwrap();
        let error = MediaElement::try_from(elem).unwrap_err();
        let message = match error {
            FromElementError::Invalid(Error::Other(string)) => string,
            _ => panic!(),
        };
        assert_eq!(message, "Unknown child in MediaElement element.");
    }

    #[test]
    fn test_bad_uri() {
        let elem: Element =
            "<media xmlns='urn:xmpp:media-element'><uri>https://example.org/</uri></media>"
                .parse()
                .unwrap();
        let error = MediaElement::try_from(elem).unwrap_err();
        let message = match error {
            FromElementError::Invalid(Error::Other(string)) => string,
            _ => panic!(),
        };
        assert_eq!(
            message,
            "Required attribute field 'type_' on Uri element missing."
        );

        let elem: Element = "<media xmlns='urn:xmpp:media-element'><uri type='text/html'/></media>"
            .parse()
            .unwrap();
        let error = MediaElement::try_from(elem).unwrap_err();
        let message = match error {
            FromElementError::Invalid(Error::Other(string)) => string,
            _ => panic!(),
        };
        assert_eq!(message, "Empty text node.");
    }

    #[test]
    fn test_xep_ex1() {
        let elem: Element = r#"<media xmlns='urn:xmpp:media-element'>
  <uri type='audio/x-wav'>http://victim.example.com/challenges/speech.wav?F3A6292C</uri>
  <uri type='audio/ogg; codecs=speex'>cid:sha1+a15a505e360702b79c75a5f67773072ed392f52a@bob.xmpp.org</uri>
  <uri type='audio/mpeg'>http://victim.example.com/challenges/speech.mp3?F3A6292C</uri>
</media>"#
            .parse()
            .unwrap();
        let media = MediaElement::try_from(elem).unwrap();
        assert!(media.width.is_none());
        assert!(media.height.is_none());
        assert_eq!(media.uris.len(), 3);
        assert_eq!(media.uris[0].type_, "audio/x-wav");
        assert_eq!(
            media.uris[0].uri,
            "http://victim.example.com/challenges/speech.wav?F3A6292C"
        );
        assert_eq!(media.uris[1].type_, "audio/ogg; codecs=speex");
        assert_eq!(
            media.uris[1].uri,
            "cid:sha1+a15a505e360702b79c75a5f67773072ed392f52a@bob.xmpp.org"
        );
        assert_eq!(media.uris[2].type_, "audio/mpeg");
        assert_eq!(
            media.uris[2].uri,
            "http://victim.example.com/challenges/speech.mp3?F3A6292C"
        );
    }

    #[test]
    fn test_xep_ex2() {
        let elem: Element = r#"<x xmlns='jabber:x:data' type='form'>
  [ ... ]
  <field var='ocr'>
    <media xmlns='urn:xmpp:media-element'
           height='80'
           width='290'>
      <uri type='image/jpeg'>http://www.victim.com/challenges/ocr.jpeg?F3A6292C</uri>
      <uri type='image/jpeg'>cid:sha1+f24030b8d91d233bac14777be5ab531ca3b9f102@bob.xmpp.org</uri>
    </media>
  </field>
  [ ... ]
</x>"#
            .parse()
            .unwrap();
        let form = DataForm::try_from(elem).unwrap();
        assert_eq!(form.fields.len(), 1);
        assert_eq!(form.fields[0].var.as_deref(), Some("ocr"));
        assert_eq!(form.fields[0].media[0].width, Some(290));
        assert_eq!(form.fields[0].media[0].height, Some(80));
        assert_eq!(form.fields[0].media[0].uris[0].type_, "image/jpeg");
        assert_eq!(
            form.fields[0].media[0].uris[0].uri,
            "http://www.victim.com/challenges/ocr.jpeg?F3A6292C"
        );
        assert_eq!(form.fields[0].media[0].uris[1].type_, "image/jpeg");
        assert_eq!(
            form.fields[0].media[0].uris[1].uri,
            "cid:sha1+f24030b8d91d233bac14777be5ab531ca3b9f102@bob.xmpp.org"
        );
    }
}