use super::encoder::{QuickWritable, Context};
use super::caltypes::*;
use super::types::Extension;

use quick_xml::Error as QError;
use quick_xml::events::{Event, BytesEnd, BytesStart, BytesText};
use quick_xml::writer::{ElementWriter, Writer};
use quick_xml::name::PrefixDeclaration;
use tokio::io::AsyncWrite;

// =============== Calendar Trait ===========================
pub trait CalContext: Context {
    fn create_cal_element(&self, name: &str) -> BytesStart;
}

// =============== CalDAV Extension Setup ===================
impl Context for CalExtension {
    fn child(&self) -> Self {
        Self { root: false }
    }
    fn create_dav_element(&self, name: &str) -> BytesStart {
        self.create_ns_element("D", name)
    }

    async fn hook_error(&self, err: &Violation, xml: &mut Writer<impl AsyncWrite+Unpin>) -> Result<(), QError> {
        err.write(xml, self.child()).await
    }

    async fn hook_property(&self, prop: &Self::Property, xml: &mut Writer<impl AsyncWrite+Unpin>) -> Result<(), QError> {
        prop.write(xml, self.child()).await 
    }

    async fn hook_resourcetype(&self, restype: &Self::ResourceType, xml: &mut Writer<impl AsyncWrite+Unpin>) -> Result<(), QError> {
        restype.write(xml, self.child()).await
    }

    async fn hook_propertyrequest(&self, propreq: &Self::PropertyRequest, xml: &mut Writer<impl AsyncWrite+Unpin>) -> Result<(), QError> {
        propreq.write(xml, self.child()).await 
    }
}

impl CalContext for CalExtension {
    fn create_cal_element(&self, name: &str) -> BytesStart {
        self.create_ns_element("C", name)
    }
}

impl CalExtension {
    fn create_ns_element(&self, ns: &str, name: &str) -> BytesStart {
        let mut start = BytesStart::new(format!("{}:{}", ns, name));
        if self.root {
            start.push_attribute(("xmlns:D", "DAV:"));
            start.push_attribute(("xmlns:C", "urn:ietf:params:xml:ns:caldav"));
        }
        start
    }
}

// ==================== Calendar Types Serialization =========================

// -------------------- MKCALENDAR METHOD ------------------------------------
impl<C: CalContext> QuickWritable<C> for MkCalendar<C> {
    async fn write(&self, xml: &mut Writer<impl AsyncWrite+Unpin>, ctx: C) -> Result<(), QError> {
        unimplemented!();
    }
}

impl<C: CalContext> QuickWritable<C> for MkCalendarResponse<C> {
    async fn write(&self, xml: &mut Writer<impl AsyncWrite+Unpin>, ctx: C) -> Result<(), QError> {
        unimplemented!();
    }
}

// ----------------------- REPORT METHOD -------------------------------------

impl<C: CalContext> QuickWritable<C> for CalendarQuery<C> {
    async fn write(&self, xml: &mut Writer<impl AsyncWrite+Unpin>, ctx: C) -> Result<(), QError> {
        unimplemented!();
    }
}

impl<C: CalContext> QuickWritable<C> for CalendarMultiget<C> {
    async fn write(&self, xml: &mut Writer<impl AsyncWrite+Unpin>, ctx: C) -> Result<(), QError> {
        unimplemented!();
    }
}

impl<C: CalContext> QuickWritable<C> for FreeBusyQuery {
    async fn write(&self, xml: &mut Writer<impl AsyncWrite+Unpin>, ctx: C) -> Result<(), QError> {
        unimplemented!();
    }
}

// -------------------------- DAV::prop --------------------------------------
impl<C: CalContext> QuickWritable<C> for Property {
    async fn write(&self, xml: &mut Writer<impl AsyncWrite+Unpin>, ctx: C) -> Result<(), QError> {
        unimplemented!();
    }
}
impl<C: CalContext> QuickWritable<C> for PropertyRequest {
    async fn write(&self, xml: &mut Writer<impl AsyncWrite+Unpin>, ctx: C) -> Result<(), QError> {
        unimplemented!();
    }
}

// ---------------------- DAV::resourcetype ----------------------------------
impl<C: CalContext> QuickWritable<C> for ResourceType {
    async fn write(&self, xml: &mut Writer<impl AsyncWrite+Unpin>, ctx: C) -> Result<(), QError> {
        match self {
            Self::Calendar => xml.write_event_async(Event::Empty(ctx.create_dav_element("calendar"))).await,
        }
    }
}

// --------------------------- DAV::error ------------------------------------
impl<C: CalContext> QuickWritable<C> for Violation {
    async fn write(&self, xml: &mut Writer<impl AsyncWrite+Unpin>, ctx: C) -> Result<(), QError> {
        match self {
            Self::ResourceMustBeNull => {
                let start = ctx.create_cal_element("resource-must-be-null");
                xml.write_event_async(Event::Empty(start)).await?;
           },
            _ => unimplemented!(),
        };
        Ok(())
    }
}


// ---------------------------- Inner XML ------------------------------------
impl<C: CalContext> QuickWritable<C> for SupportedCollation {
    async fn write(&self, xml: &mut Writer<impl AsyncWrite+Unpin>, ctx: C) -> Result<(), QError> {
        unimplemented!();
    }
}

impl<C: CalContext> QuickWritable<C>  for Collation {
    async fn write(&self, xml: &mut Writer<impl AsyncWrite+Unpin>, ctx: C) -> Result<(), QError> {
        unimplemented!();
    }
}

impl<C: CalContext> QuickWritable<C> for CalendarDataPayload {
    async fn write(&self, xml: &mut Writer<impl AsyncWrite+Unpin>, ctx: C) -> Result<(), QError> {
        unimplemented!();
    }
}

impl<C: CalContext> QuickWritable<C> for CalendarDataRequest {
    async fn write(&self, xml: &mut Writer<impl AsyncWrite+Unpin>, ctx: C) -> Result<(), QError> {
        unimplemented!();
    }
}

impl<C: CalContext> QuickWritable<C> for CalendarDataEmpty {
    async fn write(&self, xml: &mut Writer<impl AsyncWrite+Unpin>, ctx: C) -> Result<(), QError> {
        unimplemented!();
    }
}

impl<C: CalContext> QuickWritable<C> for CalendarDataSupport {
    async fn write(&self, xml: &mut Writer<impl AsyncWrite+Unpin>, ctx: C) -> Result<(), QError> {
        unimplemented!();
    }
}

impl<C: CalContext> QuickWritable<C> for Comp {
    async fn write(&self, xml: &mut Writer<impl AsyncWrite+Unpin>, ctx: C) -> Result<(), QError> {
        unimplemented!();
    }
}

impl<C: CalContext> QuickWritable<C> for CompSupport {
    async fn write(&self, xml: &mut Writer<impl AsyncWrite+Unpin>, ctx: C) -> Result<(), QError> {
        unimplemented!();
    }
}

impl<C: CalContext> QuickWritable<C> for CompKind {
    async fn write(&self, xml: &mut Writer<impl AsyncWrite+Unpin>, ctx: C) -> Result<(), QError> {
        unimplemented!();
    }
}

impl<C: CalContext> QuickWritable<C> for PropKind {
    async fn write(&self, xml: &mut Writer<impl AsyncWrite+Unpin>, ctx: C) -> Result<(), QError> {
        unimplemented!();
    }
}

impl<C: CalContext> QuickWritable<C> for CalProp {
    async fn write(&self, xml: &mut Writer<impl AsyncWrite+Unpin>, ctx: C) -> Result<(), QError> {
        unimplemented!();
    }
}

impl<C: CalContext> QuickWritable<C> for RecurrenceModifier {
    async fn write(&self, xml: &mut Writer<impl AsyncWrite+Unpin>, ctx: C) -> Result<(), QError> {
        unimplemented!();
    }
}

impl<C: CalContext> QuickWritable<C> for Expand {
    async fn write(&self, xml: &mut Writer<impl AsyncWrite+Unpin>, ctx: C) -> Result<(), QError> {
        unimplemented!();
    }
}

impl<C: CalContext> QuickWritable<C> for LimitRecurrenceSet {
    async fn write(&self, xml: &mut Writer<impl AsyncWrite+Unpin>, ctx: C) -> Result<(), QError> {
        unimplemented!();
    }
}

impl<C: CalContext> QuickWritable<C> for LimitFreebusySet {
    async fn write(&self, xml: &mut Writer<impl AsyncWrite+Unpin>, ctx: C) -> Result<(), QError> {
        unimplemented!();
    }
}

impl<C: CalContext> QuickWritable<C>  for CalendarSelector<C> {
    async fn write(&self, xml: &mut Writer<impl AsyncWrite+Unpin>, ctx: C) -> Result<(), QError> {
        unimplemented!();
    }
}

impl<C: CalContext> QuickWritable<C> for CompFilter {
    async fn write(&self, xml: &mut Writer<impl AsyncWrite+Unpin>, ctx: C) -> Result<(), QError> {
        unimplemented!();
    }
}

impl<C: CalContext> QuickWritable<C> for CompFilterInner {
    async fn write(&self, xml: &mut Writer<impl AsyncWrite+Unpin>, ctx: C) -> Result<(), QError> {
        unimplemented!();
    }
}

impl<C: CalContext> QuickWritable<C> for CompFilterMatch {
    async fn write(&self, xml: &mut Writer<impl AsyncWrite+Unpin>, ctx: C) -> Result<(), QError> {
        unimplemented!();
    }
}

impl<C: CalContext> QuickWritable<C> for PropFilter {
    async fn write(&self, xml: &mut Writer<impl AsyncWrite+Unpin>, ctx: C) -> Result<(), QError> {
        unimplemented!();
    }
}

impl<C: CalContext> QuickWritable<C> for PropFilterInner {
    async fn write(&self, xml: &mut Writer<impl AsyncWrite+Unpin>, ctx: C) -> Result<(), QError> {
        unimplemented!();
    }
}

impl<C: CalContext> QuickWritable<C> for PropFilterMatch {
    async fn write(&self, xml: &mut Writer<impl AsyncWrite+Unpin>, ctx: C) -> Result<(), QError> {
        unimplemented!();
    }
}

impl<C: CalContext> QuickWritable<C> for TimeOrText {
    async fn write(&self, xml: &mut Writer<impl AsyncWrite+Unpin>, ctx: C) -> Result<(), QError> {
        unimplemented!();
    }
}

impl<C: CalContext> QuickWritable<C> for TextMatch {
    async fn write(&self, xml: &mut Writer<impl AsyncWrite+Unpin>, ctx: C) -> Result<(), QError> {
        unimplemented!();
    }
}

impl<C: CalContext> QuickWritable<C> for ParamFilter {
    async fn write(&self, xml: &mut Writer<impl AsyncWrite+Unpin>, ctx: C) -> Result<(), QError> {
        unimplemented!();
    }
}

impl<C: CalContext> QuickWritable<C> for ParamFilterMatch {
    async fn write(&self, xml: &mut Writer<impl AsyncWrite+Unpin>, ctx: C) -> Result<(), QError> {
        unimplemented!();
    }
}

impl<C: CalContext> QuickWritable<C> for TimeZone {
    async fn write(&self, xml: &mut Writer<impl AsyncWrite+Unpin>, ctx: C) -> Result<(), QError> {
        unimplemented!();
    }
}

impl<C: CalContext> QuickWritable<C> for Filter {
    async fn write(&self, xml: &mut Writer<impl AsyncWrite+Unpin>, ctx: C) -> Result<(), QError> {
        unimplemented!();
    }
}

impl<C: CalContext> QuickWritable<C> for Component {
    async fn write(&self, xml: &mut Writer<impl AsyncWrite+Unpin>, ctx: C) -> Result<(), QError> {
        unimplemented!();
    }
}

impl<C: CalContext> QuickWritable<C> for ComponentProperty {
    async fn write(&self, xml: &mut Writer<impl AsyncWrite+Unpin>, ctx: C) -> Result<(), QError> {
        unimplemented!();
    }
}

impl<C: CalContext> QuickWritable<C> for PropertyParameter {
    async fn write(&self, xml: &mut Writer<impl AsyncWrite+Unpin>, ctx: C) -> Result<(), QError> {
        unimplemented!();
    }
}

impl<C: CalContext> QuickWritable<C> for TimeRange {
    async fn write(&self, xml: &mut Writer<impl AsyncWrite+Unpin>, ctx: C) -> Result<(), QError> {
        unimplemented!();
    }
}


#[cfg(test)]
mod tests {
    use super::*;
    use crate::dav::types::{Error, Violation as DavViolation};
    use tokio::io::AsyncWriteExt;

    #[tokio::test]
    async fn test_violation() {
        let mut buffer = Vec::new();
        let mut tokio_buffer = tokio::io::BufWriter::new(&mut buffer);
        let mut writer = Writer::new_with_indent(&mut tokio_buffer, b' ', 4);

        let res = Error(vec![
            DavViolation::Extension(Violation::ResourceMustBeNull),
        ]);

        res.write(&mut writer, CalExtension { root: true }).await.expect("xml serialization");
        tokio_buffer.flush().await.expect("tokio buffer flush");

        let expected = r#"<D:error xmlns:D="DAV:" xmlns:C="urn:ietf:params:xml:ns:caldav">
    <C:resource-must-be-null/>
</D:error>"#;
        let got = std::str::from_utf8(buffer.as_slice()).unwrap();

        assert_eq!(got, expected);
    }
}