use std::sync::Arc;
type ArcUser = std::sync::Arc<User>;

use anyhow::{anyhow, Result};
use futures::stream::StreamExt;
use futures::{future::BoxFuture, future::FutureExt};

use aero_collections::{user::User, calendar::Calendar, davdag::BlobId};
use aero_dav::types as dav;
use aero_dav::caltypes as cal;
use aero_dav::acltypes as acl;
use aero_dav::realization::{All, self as all};


use crate::dav::node::DavNode;

#[derive(Clone)]
pub(crate) struct RootNode {}
impl DavNode for RootNode {
    fn fetch<'a>(&self, user: &'a ArcUser, path: &'a [&str]) -> BoxFuture<'a, Result<Box<dyn DavNode>>> {
        if path.len() == 0 {
            let this = self.clone();
            return async { Ok(Box::new(this) as Box<dyn DavNode>) }.boxed();
        }

        if path[0] == user.username {
            let child = Box::new(HomeNode {});
            return child.fetch(user, &path[1..]);
        }

        async { Err(anyhow!("Not found")) }.boxed()
    }

    fn children<'a>(&self, user: &'a ArcUser) -> BoxFuture<'a, Vec<Box<dyn DavNode>>> {
        async { vec![Box::new(HomeNode { }) as Box<dyn DavNode>] }.boxed()
    }

    fn path(&self, user: &ArcUser) -> String {
        "/".into()
    }

    fn supported_properties(&self, user: &ArcUser) -> dav::PropName<All> {
        dav::PropName(vec![
            dav::PropertyRequest::DisplayName,
            dav::PropertyRequest::ResourceType,
            dav::PropertyRequest::GetContentType,
            dav::PropertyRequest::Extension(all::PropertyRequest::Acl(acl::PropertyRequest::CurrentUserPrincipal)),
        ])
    }
    fn properties(&self, user: &ArcUser, prop: dav::PropName<All>) -> Vec<dav::AnyProperty<All>> {
        prop.0.into_iter().map(|n| match n {
            dav::PropertyRequest::DisplayName => dav::AnyProperty::Value(dav::Property::DisplayName("DAV Root".to_string())),
            dav::PropertyRequest::ResourceType => dav::AnyProperty::Value(dav::Property::ResourceType(vec![
                dav::ResourceType::Collection,
            ])),
            dav::PropertyRequest::GetContentType => dav::AnyProperty::Value(dav::Property::GetContentType("httpd/unix-directory".into())),
            dav::PropertyRequest::Extension(all::PropertyRequest::Acl(acl::PropertyRequest::CurrentUserPrincipal)) =>
                dav::AnyProperty::Value(dav::Property::Extension(all::Property::Acl(acl::Property::CurrentUserPrincipal(acl::User::Authenticated(dav::Href(HomeNode{}.path(user))))))),
            v => dav::AnyProperty::Request(v),
        }).collect()
    }
}

#[derive(Clone)]
pub(crate) struct HomeNode {}
impl DavNode for HomeNode {
    fn fetch<'a>(&self, user: &'a ArcUser, path: &'a [&str]) -> BoxFuture<'a, Result<Box<dyn DavNode>>> {
        if path.len() == 0 {
            let node = Box::new(self.clone()) as Box<dyn DavNode>;
            return async { Ok(node) }.boxed()
        }

        if path[0] == "calendar" {
            return async {
                let child = Box::new(CalendarListNode::new(user).await?);
                child.fetch(user, &path[1..]).await
            }.boxed();
        }

        async { Err(anyhow!("Not found")) }.boxed()
    }

    fn children<'a>(&self, user: &'a ArcUser) -> BoxFuture<'a, Vec<Box<dyn DavNode>>> {
        async { 
            CalendarListNode::new(user).await
                .map(|c| vec![Box::new(c) as Box<dyn DavNode>])
                .unwrap_or(vec![]) 
        }.boxed()
    }

    fn path(&self, user: &ArcUser) -> String {
        format!("/{}/", user.username)
    }

    fn supported_properties(&self, user: &ArcUser) -> dav::PropName<All> {
        dav::PropName(vec![
            dav::PropertyRequest::DisplayName,
            dav::PropertyRequest::ResourceType,
            dav::PropertyRequest::GetContentType,
            dav::PropertyRequest::Extension(all::PropertyRequest::Cal(cal::PropertyRequest::CalendarHomeSet)),
        ])
    }
    fn properties(&self, user: &ArcUser, prop: dav::PropName<All>) -> Vec<dav::AnyProperty<All>> {
        prop.0.into_iter().map(|n| match n {
            dav::PropertyRequest::DisplayName => dav::AnyProperty::Value(dav::Property::DisplayName(format!("{} home", user.username))),
            dav::PropertyRequest::ResourceType => dav::AnyProperty::Value(dav::Property::ResourceType(vec![
                dav::ResourceType::Collection,
                dav::ResourceType::Extension(all::ResourceType::Acl(acl::ResourceType::Principal)),
            ])),
            dav::PropertyRequest::GetContentType => dav::AnyProperty::Value(dav::Property::GetContentType("httpd/unix-directory".into())),
            dav::PropertyRequest::Extension(all::PropertyRequest::Cal(cal::PropertyRequest::CalendarHomeSet)) => 
                dav::AnyProperty::Value(dav::Property::Extension(all::Property::Cal(cal::Property::CalendarHomeSet(dav::Href(/*CalendarListNode{}.path(user)*/ todo!()))))),
            v => dav::AnyProperty::Request(v),
        }).collect()
    }
}

#[derive(Clone)]
pub(crate) struct CalendarListNode {
    list: Vec<String>,
}
impl CalendarListNode {
    async fn new(user: &ArcUser) -> Result<Self> {
        let list = user.calendars.list(user).await?;
        Ok(Self { list })
    }
}
impl DavNode for CalendarListNode {
    fn fetch<'a>(&self, user: &'a ArcUser, path: &'a [&str]) -> BoxFuture<'a, Result<Box<dyn DavNode>>> {
        if path.len() == 0 {
            let node = Box::new(self.clone()) as Box<dyn DavNode>;
            return async { Ok(node) }.boxed();
        }

        async {
            let cal = user.calendars.open(user, path[0]).await?.ok_or(anyhow!("Not found"))?;
            let child = Box::new(CalendarNode { 
                col: cal,
                calname: path[0].to_string()
            });
            child.fetch(user, &path[1..]).await
        }.boxed()
    }

    fn children<'a>(&self, user: &'a ArcUser) -> BoxFuture<'a, Vec<Box<dyn DavNode>>> {
        let list = self.list.clone();
        async move {
            //@FIXME maybe we want to be lazy here?!
            futures::stream::iter(list.iter())
                .filter_map(|name| async move {
                    user.calendars.open(user, name).await
                        .ok()
                        .flatten()
                        .map(|v| (name, v))
                })
                .map(|(name, cal)| Box::new(CalendarNode { 
                    col: cal,
                    calname: name.to_string(),
                }) as Box<dyn DavNode>)
                .collect::<Vec<Box<dyn DavNode>>>()
                .await
        }.boxed()
    }

    fn path(&self, user: &ArcUser) -> String {
        format!("/{}/calendar/", user.username)
    }

    fn supported_properties(&self, user: &ArcUser) -> dav::PropName<All> {
        dav::PropName(vec![
            dav::PropertyRequest::DisplayName,
            dav::PropertyRequest::ResourceType,
            dav::PropertyRequest::GetContentType,
        ])
    }
    fn properties(&self, user: &ArcUser, prop: dav::PropName<All>) -> Vec<dav::AnyProperty<All>> {
        prop.0.into_iter().map(|n| match n {
            dav::PropertyRequest::DisplayName => dav::AnyProperty::Value(dav::Property::DisplayName(format!("{} calendars", user.username))),
            dav::PropertyRequest::ResourceType => dav::AnyProperty::Value(dav::Property::ResourceType(vec![dav::ResourceType::Collection])),
            dav::PropertyRequest::GetContentType => dav::AnyProperty::Value(dav::Property::GetContentType("httpd/unix-directory".into())),
            v => dav::AnyProperty::Request(v),
        }).collect()
    }
}

#[derive(Clone)]
pub(crate) struct CalendarNode {
    col: Arc<Calendar>,
    calname: String,
}
impl DavNode for CalendarNode {
    fn fetch<'a>(&self, user: &'a ArcUser, path: &'a [&str]) -> BoxFuture<'a, Result<Box<dyn DavNode>>> {
        if path.len() == 0 {
            let node = Box::new(self.clone()) as Box<dyn DavNode>;
            return async { Ok(node) }.boxed()
        }

        let col = self.col.clone();
        let calname = self.calname.clone();
        async move {
            if let Some(blob_id) = col.dag().await.idx_by_filename.get(path[0]) {
                let child = Box::new(EventNode {
                    col: col.clone(),
                    calname,
                    filename: path[0].to_string(),
                    blob_id: *blob_id,
                });
                return child.fetch(user, &path[1..]).await
            }

            Err(anyhow!("Not found"))
        }.boxed()
    }

    fn children<'a>(&self, user: &'a ArcUser) -> BoxFuture<'a, Vec<Box<dyn DavNode>>> {
        let col = self.col.clone();
        let calname = self.calname.clone();

        async move {
            col.dag().await.idx_by_filename.iter().map(|(filename, blob_id)| {
                Box::new(EventNode { 
                    col: col.clone(),
                    calname: calname.clone(),
                    filename: filename.to_string(),
                    blob_id: *blob_id,
                }) as Box<dyn DavNode>
            }).collect()
        }.boxed()
    }

    fn path(&self, user: &ArcUser) -> String {
        format!("/{}/calendar/{}/", user.username, self.calname)
    }

    fn supported_properties(&self, user: &ArcUser) -> dav::PropName<All> {
        dav::PropName(vec![
            dav::PropertyRequest::DisplayName,
            dav::PropertyRequest::ResourceType,
            dav::PropertyRequest::GetContentType,
            dav::PropertyRequest::Extension(all::PropertyRequest::Cal(cal::PropertyRequest::SupportedCalendarComponentSet)),
        ])
    }
    fn properties(&self, _user: &ArcUser, prop: dav::PropName<All>) -> Vec<dav::AnyProperty<All>> {
        prop.0.into_iter().map(|n| match n {
            dav::PropertyRequest::DisplayName =>  dav::AnyProperty::Value(dav::Property::DisplayName(format!("{} calendar", self.calname))),
            dav::PropertyRequest::ResourceType =>  dav::AnyProperty::Value(dav::Property::ResourceType(vec![
                dav::ResourceType::Collection,
                dav::ResourceType::Extension(all::ResourceType::Cal(cal::ResourceType::Calendar)),
            ])),
            //dav::PropertyRequest::GetContentType => dav::AnyProperty::Value(dav::Property::GetContentType("httpd/unix-directory".into())),
            //@FIXME seems wrong but seems to be what Thunderbird expects...
            dav::PropertyRequest::GetContentType => dav::AnyProperty::Value(dav::Property::GetContentType("text/calendar".into())),
            dav::PropertyRequest::Extension(all::PropertyRequest::Cal(cal::PropertyRequest::SupportedCalendarComponentSet))
                => dav::AnyProperty::Value(dav::Property::Extension(all::Property::Cal(cal::Property::SupportedCalendarComponentSet(vec![
                    cal::CompSupport(cal::Component::VEvent),
                ])))),
            v => dav::AnyProperty::Request(v),
        }).collect()
    }
}

const FAKE_ICS: &str = r#"BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Example Corp.//CalDAV Client//EN
BEGIN:VTIMEZONE
LAST-MODIFIED:20040110T032845Z
TZID:US/Eastern
BEGIN:DAYLIGHT
DTSTART:20000404T020000
RRULE:FREQ=YEARLY;BYDAY=1SU;BYMONTH=4
TZNAME:EDT
TZOFFSETFROM:-0500
TZOFFSETTO:-0400
END:DAYLIGHT
BEGIN:STANDARD
DTSTART:20001026T020000
RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=10
TZNAME:EST
TZOFFSETFROM:-0400
TZOFFSETTO:-0500
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
DTSTAMP:20240406T001102Z
DTSTART;TZID=US/Eastern:20240406T100000
DURATION:PT1H
SUMMARY:Event #1
Description:Go Steelers!
UID:74855313FA803DA593CD579A@example.com
END:VEVENT
END:VCALENDAR"#;

#[derive(Clone)]
pub(crate) struct EventNode {
    col: Arc<Calendar>,
    calname: String,
    filename: String,
    blob_id: BlobId,
}
impl DavNode for EventNode {
    fn fetch<'a>(&self, user: &'a ArcUser, path: &'a [&str]) -> BoxFuture<'a, Result<Box<dyn DavNode>>> {
        if path.len() == 0 {
            let node = Box::new(self.clone()) as Box<dyn DavNode>;
            return async { Ok(node) }.boxed()
        }

        async { Err(anyhow!("Not found")) }.boxed()
    }

    fn children<'a>(&self, user: &'a ArcUser) -> BoxFuture<'a, Vec<Box<dyn DavNode>>> {
        async { vec![] }.boxed()
    }

    fn path(&self, user: &ArcUser) -> String {
        format!("/{}/calendar/{}/{}", user.username, self.calname, self.filename)
    }

    fn supported_properties(&self, user: &ArcUser) -> dav::PropName<All> {
        dav::PropName(vec![
            dav::PropertyRequest::DisplayName,
            dav::PropertyRequest::ResourceType,
            dav::PropertyRequest::GetEtag,
            dav::PropertyRequest::Extension(all::PropertyRequest::Cal(cal::PropertyRequest::CalendarData(cal::CalendarDataRequest::default()))),
        ])
    }
    fn properties(&self, _user: &ArcUser, prop: dav::PropName<All>) -> Vec<dav::AnyProperty<All>> {
        prop.0.into_iter().map(|n| match n {
            dav::PropertyRequest::DisplayName => dav::AnyProperty::Value(dav::Property::DisplayName(format!("{} event", self.filename))),
            dav::PropertyRequest::ResourceType => dav::AnyProperty::Value(dav::Property::ResourceType(vec![])),
            dav::PropertyRequest::GetContentType =>  dav::AnyProperty::Value(dav::Property::GetContentType("text/calendar".into())),
            dav::PropertyRequest::GetEtag => dav::AnyProperty::Value(dav::Property::GetEtag("\"abcdefg\"".into())),
            dav::PropertyRequest::Extension(all::PropertyRequest::Cal(cal::PropertyRequest::CalendarData(req))) =>
                dav::AnyProperty::Value(dav::Property::Extension(all::Property::Cal(cal::Property::CalendarData(cal::CalendarDataPayload { 
                    mime: None, 
                    payload: FAKE_ICS.into() 
                })))),
            v => dav::AnyProperty::Request(v),
        }).collect()
    }
}