use enostr::{Filter, Pubkey};
use nostrdb::{FilterBuilder, Ndb, ProfileRecord, Transaction};

use crate::{
    app::copy_notes_into_timeline, filter::{self, FilterState}, multi_subscriber::MultiSubscriber, note::NoteRef, notecache::NoteCache, notes_holder::NotesHolder, timeline::{PubkeySource, Timeline, TimelineKind}
};

pub enum DisplayName<'a> {
    One(&'a str),

    Both {
        username: &'a str,
        display_name: &'a str,
    },
}

impl<'a> DisplayName<'a> {
    pub fn username(&self) -> &'a str {
        match self {
            Self::One(n) => n,
            Self::Both { username, .. } => username,
        }
    }
}

fn is_empty(s: &str) -> bool {
    s.chars().all(|c| c.is_whitespace())
}

pub fn get_profile_name<'a>(record: &'a ProfileRecord) -> Option<DisplayName<'a>> {
    let profile = record.record().profile()?;
    let display_name = profile.display_name().filter(|n| !is_empty(n));
    let name = profile.name().filter(|n| !is_empty(n));

    match (display_name, name) {
        (None, None) => None,
        (Some(disp), None) => Some(DisplayName::One(disp)),
        (None, Some(username)) => Some(DisplayName::One(username)),
        (Some(display_name), Some(username)) => Some(DisplayName::Both {
            display_name,
            username,
        }),
    }
}

pub struct Profile {
    pub timeline: Timeline,
    pub multi_subscriber: Option<MultiSubscriber>,
}

impl Profile {
    pub fn new(
        txn: &Transaction,
        ndb: &Ndb,
        note_cache: &mut NoteCache,
        source: PubkeySource,
        filters: Vec<Filter>,
        notes: Vec<NoteRef>,
    ) -> Self {
        let mut timeline =
            Timeline::new(TimelineKind::profile(source), FilterState::ready(filters));

            copy_notes_into_timeline(&mut timeline, txn, ndb, note_cache, notes);

        Profile {
            timeline,
            multi_subscriber: None,
        }
    }

    fn filters_raw(pk: &[u8; 32]) -> Vec<FilterBuilder> {
        vec![Filter::new()
            .authors([pk])
            .kinds([1])
            .limit(filter::default_limit())]
    }
}

impl NotesHolder for Profile {
    fn get_multi_subscriber(&mut self) -> Option<&mut MultiSubscriber> {
        self.multi_subscriber.as_mut()
    }

    fn get_view(&mut self) -> &mut crate::timeline::TimelineTab {
        self.timeline.current_view_mut()
    }

    fn filters(for_id: &[u8; 32]) -> Vec<enostr::Filter> {
        Profile::filters_raw(for_id)
            .into_iter()
            .map(|mut f| f.build())
            .collect()
    }

    fn filters_since(for_id: &[u8; 32], since: u64) -> Vec<enostr::Filter> {
        Profile::filters_raw(for_id)
            .into_iter()
            .map(|f| f.since(since).build())
            .collect()
    }

    fn new_notes_holder(
        txn: &Transaction,
        ndb: &Ndb,
        note_cache: &mut NoteCache,
        id: &[u8; 32],
        filters: Vec<Filter>,
        notes: Vec<NoteRef>,
    ) -> Self {
        Profile::new(
            txn,
            ndb,
            note_cache,
            PubkeySource::Explicit(Pubkey::new(*id)),
            filters,
            notes,
        )
    }

    fn set_multi_subscriber(&mut self, subscriber: MultiSubscriber) {
        self.multi_subscriber = Some(subscriber);
    }
}