use serde::de::Error as DeError;
use serde::de::{Deserializer, Visitor};
use serde::ser::Serializer;
use serde::{Deserialize, Serialize};
#[cfg(feature = "speedy")]
use speedy::{Context, Readable, Reader, Writable, Writer};
use std::convert::From;
use std::fmt;

macro_rules! define_event_kinds {
    ($($comment:expr, $display:expr, $name:ident = $value:expr),*) => {
        /// A kind of Event
        #[derive(Copy, Clone, Debug, Eq, PartialEq, Hash)]
        #[repr(u32)]
        pub enum EventKind {
            $(
                #[doc = $comment]
                $name = $value,
            )*
            /// Job Request (NIP-90) 5000-5999
            JobRequest(u32),
            /// Job Result (NIP-90) 6000-6999
            JobResult(u32),
            /// Group control events (NIP-29) 9000-9030
            GroupControl(u32),
            /// Relay-specific replaceable event
            Replaceable(u32),
            /// Ephemeral event, sent to all clients with matching filters and should not be stored
            Ephemeral(u32),
            /// Group Metadata events
            GroupMetadata(u32),
            /// Something else?
            Other(u32),
        }

        static WELL_KNOWN_KINDS: &[EventKind] = &[
            $($name,)*
        ];

        impl fmt::Display for EventKind {
            fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
                match *self {
                    $($name => write!(f, $display),)*
                    JobRequest(u) => write!(f, "Job Request ({})", u),
                    JobResult(u) => write!(f, "Job Result ({})", u),
                    GroupControl(u) => write!(f, "Group Control ({})", u),
                    Replaceable(u) => write!(f, "Replaceable ({})", u),
                    Ephemeral(u) => write!(f, "Ephemeral ({})", u),
                    GroupMetadata(u) => write!(f, "Group Metadata ({})", u),
                    Other(u) => write!(f, "Other ({})", u),
                }
            }
        }

        impl From<u32> for EventKind {
            fn from(u: u32) -> Self {
                match u {
                    $($value => $name,)*
                    x if (5_000..5_999).contains(&x) => JobRequest(x),
                    x if (6_000..6_999).contains(&x) => JobResult(x),
                    x if (9_000..9_030).contains(&x) => GroupControl(x),
                    x if (10_000..20_000).contains(&x) => Replaceable(x),
                    x if (20_000..30_000).contains(&x) => Ephemeral(x),
                    x if (39_000..39_009).contains(&x) => GroupMetadata(x),
                    x => Other(x),
                }
            }
        }

        impl From<EventKind> for u32 {
            fn from(e: EventKind) -> u32 {
                match e {
                    $($name => $value,)*
                    JobRequest(u) => u,
                    JobResult(u) => u,
                    GroupControl(u) => u,
                    Replaceable(u) => u,
                    Ephemeral(u) => u,
                    GroupMetadata(u) => u,
                    Other(u) => u,
                }
            }
        }
    };
}

define_event_kinds!(
    "Event sets the metadata associated with a public key (NIP-01)",
    "User Metadata",
    Metadata = 0,

    "Event is a text note (NIP-01)",
    "Short Text Note",
    TextNote = 1,

    "Event contains a relay URL which the author recommends",
    "Recommend Relay",
    RecommendRelay = 2,

    "Event contains tags which represent the authors contacts including the authors pet names for them (NIP-02)",
    "Follows",
    ContactList = 3,

    "Event is an encrypted direct message (NIP-04)",
    "Encrypted Direct Messages",
    EncryptedDirectMessage = 4,

    "Event is an authors request to delete previous events (NIP-09)",
    "Event Deletion Request",
    EventDeletion = 5,

    "Repost (NIP-18)",
    "Repost",
    Repost = 6,

    "Event is a reaction to a `TextNote` event (NIP-25)",
    "Reaction",
    Reaction = 7,

    "Badge Award (NIP-58)",
    "Badge Award",
    BadgeAward = 8,

    "Group Chat Message (NIP-29)",
    "Group Chat Message",
    GroupChatMessage = 9,

    "Group Chat Threaded Reply (NIP-29)",
    "Group Chat Threaded Reply",
    GroupChatThreadedReply = 10,

    "Group Chat Thread (NIP-29)",
    "Group Chat Thread",
    GroupChatThread = 11,

    "Group Chat Reply (NIP-29)",
    "Group Chat Reply",
    GroupChatReply = 12,

    "Seal (NIP-59 PR 716)",
    "Seal",
    Seal = 13,

    "Chat Message / DM (NIP-24 PR 686)",
    "Direct Message",
    DmChat = 14,

    "Generic Repost (NIP-18)",
    "Generic Repost",
    GenericRepost = 16,

    "Reaction to a website (NIP-25)",
    "Reaction to a website",
    ReactionToWebsite = 17,

    "Event creates a public channel (NIP-28)",
    "Channel Creation",
    ChannelCreation = 40,

    "Event sets metadata on a public channel (NIP-28)",
    "Channel Metadata",
    ChannelMetadata = 41,

    "Event creates a message on a public channel (NIP-28)",
    "Channel Message",
    ChannelMessage = 42,

    "Event hides a message on a public channel (NIP-28)",
    "Channel Hide Message",
    ChannelHideMessage = 43,

    "Event mutes a user on a public channel (NIP-28)",
    "Channel Mute User",
    ChannelMuteUser = 44,

    "Chess (PGN) (NIP-64)",
    "Chess (PGN)",
    ChessPgn = 64,

    "Wiki article merge requests (NIP-54)",
    "Wiki Merge Requests",
    WikiMergeRequest = 818,

    "Bid (NIP-15)",
    "Bid",
    Bid = 1021,

    "Bid Confirmation (NIP-15)",
    "Bid Confirmation",
    BidConfirmation = 1022,

    "Open Timestamps (NIP-03)",
    "Open Timestamp",
    Timestamp = 1040,

    "Gift Wrap (NIP-59 PR 716)",
    "Gift Wrap",
    GiftWrap = 1059,

    "File Metadata (NIP-94)",
    "File Metadata",
    FileMetadata = 1063,

    "Comment (NIP-22 PR #1233)" ,
    "Comment",
    Comment = 1111,

    "Live Chat Message (NIP-53)",
    "Live Chat Message",
    LiveChatMessage = 1311,

    "Git Patches (NIP-34)",
    "Git Patch",
    Patches = 1617,

    "Git Issue (NIP-34)",
    "Git Issue",
    GitIssue = 1621,

    "Replies (NIP-34)",
    "Git Reply",
    GitReply = 1622,

    "Status Open  (NIP-34)",
    "Git Status Open",
    GitStatusOpen = 1630,

    "Status Applied (NIP-34)",
    "Git Status Applied",
    GitStatusApplied = 1631,

    "Status Closed (NIP-34)",
    "Git Status Closed",
    GitStatusClosed = 1632,

    "Status Draft (NIP-34)",
    "Git Status Draft",
    GitStatusDraft = 1633,

    "Problem Tracker (nostrocket-1971)",
    "Problem Tracker",
    ProblemTracker = 1971,

    "Reporting (NIP-56)",
    "Reporting",
    Reporting = 1984,

    "Label (NIP-32)",
    "Label",
    Label = 1985,

    "Relay reviews",
    "Relay reviews",
    RelayReviews = 1986,

    "AI Embeddings",
    "AI Embeddings",
    AiEmbeddings = 1987,

    "Torrent",
    "Torrent",
    Torrent = 2003,

    "Torrent Comment",
    "Torrent Comment",
    TorrentComment = 2004,

    "Coinjoin Pool",
    "Coinjoin Pool",
    CoinjoinPool = 2022,

    "Community Post Approval (NIP-72)",
    "Community Post Approval",
    CommunityPostApproval = 4550,

    "Job Feedback (NIP-90)",
    "Job Feedback",
    JobFeedback = 7000,

    "Zap Goal (NIP-75)",
    "Zap Goal",
    ZapGoal = 9041,

    "Tidal Login",
    "Tidal Login",
    TidalLogin = 9467,

    "Zap Request",
    "Zap Request",
    ZapRequest = 9734,

    "Zap",
    "Zap",
    Zap = 9735,

    "Highlights (NIP-84)",
    "Highlights",
    Highlights = 9802,

    "Mute List (NIP-51)",
    "Mute List",
    MuteList = 10000,

    "Pin List (NIP-51)",
    "Pin List",
    PinList = 10001,

    "Relay List Metadata (NIP-65)",
    "Relay List Metadata",
    RelayList = 10002,

    "Bookmarks List (NIP-51)",
    "Bookmarks List",
    BookmarkList = 10003,

    "Communities List (NIP-51)",
    "Communities List",
    CommunityList = 10004,

    "Public Chats List (NIP-51)",
    "Public Chats List",
    PublicChatsList = 10005,

    "Blocked Relays List (NIP-51)",
    "Blocked Relays List",
    BlockedRelaysList = 10006,

    "Search Relays List (NIP-51)",
    "Search Relays List",
    SearchRelaysList = 10007,

    "User Groups (NIP-51, NIP-29)",
    "User Groups",
    UserGroups = 10009,

    "Interests List (NIP-51)",
    "Interests List",
    InterestsList = 10015,

    "User Emoji List (NIP-51)",
    "User Emoji List",
    UserEmojiList = 10030,

    "Relay list to receive DMs (NIP-17)",
    "DM Relay List",
    DmRelayList = 10050,

    "User Server List",
    "User Server List",
    UserServerList = 10063,

    "File storage server list (NIP-96)",
    "File Storage Server List",
    FileStorageServerList = 10096,

    "Wallet Info (NIP-47)",
    "Wallet Info",
    WalletInfo = 13194,

    "Lightning Pub RPC (Lightning.Pub)",
    "Lightning Pub RPC",
    LightningPubRpc = 21000,

    "Client Authentication (NIP-42)",
    "Client Authentication",
    Auth = 22242,

    "Wallet Request (NIP-47)",
    "Wallet Request",
    WalletRequest = 23194,

    "Wallet Response (NIP-47)",
    "Wallet Response",
    WalletResponse = 23195,

    "Nostr Connect (NIP-46)",
    "Nostr Connect",
    NostrConnect = 24133,

    "Blobs stored on mediaservers (Blossom)",
    "Blossom",
    Blossom = 24242,

    "HTTP Auth (NIP-98)",
    "HTTP Auth",
    HttpAuth = 27235,

    "Categorized People List (NIP-51)",
    "Follow Sets",
    FollowSets = 30000,

    "Categorized Bookmark List (NIP-51)",
    "Generic Lists",
    GenericSets = 30001,

    "Relay Sets (NIP-51)",
    "Relay Sets",
    RelaySets = 30002,

    "Bookmark Sets (NIP-51)",
    "Bookmark Sets",
    BookmarkSets = 30003,

    "Curation Sets (NIP-51)",
    "Curation Sets",
    CurationSets = 30004,

    "Video Sets (NIP-51)",
    "Video Sets",
    VideoSets = 30005,

    "Kind Mute Sets (NIP-51)",
    "Kind Mute Sets",
    KindMuteSets = 30007,

    "Profile Badges (NIP-58)",
    "Profile Badges",
    ProfileBadges = 30008,

    "Badge Definition (NIP-58)",
    "Badge Definition",
    BadgeDefinition = 30009,

    "Interest Sets (NIP-51)",
    "Interest Sets",
    InterestSets = 30015,

    "Create or update a stall (NIP-15)",
    "Create Or Update Stall",
    CreateUpdateStall = 30017,

    "Create or update a product (NIP-15)",
    "Create Or Update Product",
    CreateUpdateProduct = 30018,

    "Marketplace UI/UX (NIP-15)",
    "Marketplace UI/UX",
    MarketplaceUi = 30019,

    "Product sold as auction (NIP-15)",
    "Product Sold As Auction",
    ProductSoldAuction = 30020,

    "Long-form Content (NIP-23)",
    "Long-form Content",
    LongFormContent = 30023,

    "Draft Long-form Content (NIP-23)",
    "Draft Long-form Content",
    DraftLongFormContent = 30024,

    "Emoji Sets (NIP-51)",
    "Emoji Sets",
    EmojiSets = 30030,

    "Modular Article Header",
    "Modular Article Header",
    ModularArticleHedaer = 30040,

    "Modular Article Content",
    "Modular Article Content",
    ModularArticleContent = 30041,

    "Release artifact sets (NIP-51)",
    "Release Artifact Sets",
    ReleaseArtifactSets = 30063,

    "Application Specific Data, (NIP-78)",
    "Application Specific Data",
    AppSpecificData = 30078,

    "Live Event (NIP-53)",
    "Live Event",
    LiveEvent = 30311,

    "User Status (NIP-315 PR 737)",
    "User Statuses",
    UserStatus = 30315,

    "Classified Listing (NIP-99)",
    "Classified Listing",
    ClassifiedListing = 30402,

    "Draft Classified Listing (NIP-99)",
    "Draft Classified Listing",
    DraftClassifiedListing = 30403,

    "Repository Announcement (NIP-34)",
    "Repository Announcement",
    RepositoryAnnouncement = 30617,

    "Repository State Announcement (NIP-34)",
    "Repository State Announcement",
    RepositoryStateAnnouncement = 30618,

    "Wiki Article (NIP-54)",
    "Wiki Article",
    WikiArticle = 30818,

    "Redirects",
    "Redirects",
    Redirects = 30819,

    "Link Set",
    "Link Set",
    LinkSet = 31388,

    "Feed",
    "Feed",
    Feed = 31890,

    "Date-Based Calendar Event (NIP-52)",
    "Date-Based Calendar Event",
    DateBasedCalendarEvent = 31922,

    "Time-Based Calendar Event (NIP-52)",
    "Time-Based Calendar Event",
    TimeBasedCalendarEvent = 31923,

    "Calendar (NIP-52)",
    "Calendar",
    Calendar = 31924,

    "Calendar Event RSVP (NIP-52)",
    "Calendar Event RSVP",
    CalendarEventRsvp = 31925,

    "Handler Recommendation (NIP-89)",
    "Handler Recommendation",
    HandlerRecommendation = 31989,

    "Handler Information (NIP-89)",
    "Handler Information",
    HandlerInformation = 31990,

    "Video Event",
    "Video Event",
    VideoEvent = 34235,

    "Short-form Portrait Video Event",
    "Short-Form Portrait Video Event",
    ShortFormPortraitVideoEvent = 34236,

    "Video View Event",
    "Video View Event",
    VideoViewEvent = 34237,

    "Community Definition (NIP-72)",
    "Community Definition",
    CommunityDefinition = 34550
);

use EventKind::*;

impl EventKind {
    // Mock data for testing
    #[allow(dead_code)]
    pub(crate) fn mock() -> EventKind {
        TextNote
    }

    /// Is a job request kind
    pub fn is_job_request(&self) -> bool {
        let u: u32 = From::from(*self);
        (5000..=5999).contains(&u)
    }

    /// Is a job result kind
    pub fn is_job_result(&self) -> bool {
        let u: u32 = From::from(*self);
        (6000..=6999).contains(&u)
    }

    /// If this event kind is a replaceable event
    /// NOTE: this INCLUDES parameterized replaceable events
    pub fn is_replaceable(&self) -> bool {
        match *self {
            Metadata => true,
            ContactList => true,
            _ => {
                let u: u32 = From::from(*self);
                (10000..=19999).contains(&u) || (30000..=39999).contains(&u)
            }
        }
    }

    /// If this event kind is ephemeral
    pub fn is_ephemeral(&self) -> bool {
        let u: u32 = From::from(*self);
        (20000..=29999).contains(&u)
    }

    /// If this event kind is parameterized replaceable
    pub fn is_parameterized_replaceable(&self) -> bool {
        let u: u32 = From::from(*self);
        (30000..=39999).contains(&u)
    }

    /// If this event kind is feed related.
    pub fn is_feed_related(&self) -> bool {
        self.is_feed_displayable() || self.augments_feed_related()
    }

    /// If this event kind is feed displayable.
    pub fn is_feed_displayable(&self) -> bool {
        matches!(
            *self,
            TextNote
                | GroupChatMessage
                | GroupChatThreadedReply
                | GroupChatThread
                | GroupChatReply
                | EncryptedDirectMessage
                | Repost
                | DmChat
                | GenericRepost
                | ChannelMessage
                | FileMetadata
                | Comment
                | LiveChatMessage
                | Patches
                | GitIssue
                | GitReply
                | GitStatusOpen
                | GitStatusApplied
                | GitStatusClosed
                | GitStatusDraft
                | LongFormContent
                | DraftLongFormContent
        )
    }

    /// Is direct message related
    pub fn is_direct_message_related(&self) -> bool {
        matches!(*self, EncryptedDirectMessage | DmChat | GiftWrap)
    }

    /// If this event kind augments a feed related event
    pub fn augments_feed_related(&self) -> bool {
        matches!(
            *self,
            EventDeletion | Reaction | Timestamp | Label | Reporting | Zap
        )
    }

    /// If the contents are expected to be encrypted (or empty)
    pub fn contents_are_encrypted(&self) -> bool {
        matches!(
            *self,
            EncryptedDirectMessage
                | MuteList
                | PinList
                | BookmarkList
                | CommunityList
                | PublicChatsList
                | BlockedRelaysList
                | SearchRelaysList
                | InterestsList
                | UserEmojiList
                | JobRequest(_)
                | JobResult(_)
                | WalletRequest
                | WalletResponse
                | NostrConnect
        )
    }

    /// This iterates through every well-known EventKind
    pub fn iter() -> EventKindIterator {
        EventKindIterator::new()
    }
}

/// Iterator over well known `EventKind`s
#[derive(Clone, Copy, Debug)]
pub struct EventKindIterator {
    pos: usize,
}

impl EventKindIterator {
    fn new() -> EventKindIterator {
        EventKindIterator { pos: 0 }
    }
}

impl Iterator for EventKindIterator {
    type Item = EventKind;

    fn next(&mut self) -> Option<EventKind> {
        if self.pos == WELL_KNOWN_KINDS.len() {
            None
        } else {
            let rval = WELL_KNOWN_KINDS[self.pos];
            self.pos += 1;
            Some(rval)
        }
    }

    fn size_hint(&self) -> (usize, Option<usize>) {
        (self.pos, Some(WELL_KNOWN_KINDS.len()))
    }
}

impl Serialize for EventKind {
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: Serializer,
    {
        let u: u32 = From::from(*self);
        serializer.serialize_u32(u)
    }
}

impl<'de> Deserialize<'de> for EventKind {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: Deserializer<'de>,
    {
        deserializer.deserialize_u32(EventKindVisitor)
    }
}

struct EventKindVisitor;

impl Visitor<'_> for EventKindVisitor {
    type Value = EventKind;

    fn expecting(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "an unsigned number that matches a known EventKind")
    }

    fn visit_u32<E>(self, v: u32) -> Result<EventKind, E>
    where
        E: DeError,
    {
        Ok(From::<u32>::from(v))
    }

    // JsonValue numbers come in as u64
    fn visit_u64<E>(self, v: u64) -> Result<EventKind, E>
    where
        E: DeError,
    {
        Ok(From::<u32>::from(v as u32))
    }
}

#[cfg(feature = "speedy")]
impl<'a, C: Context> Readable<'a, C> for EventKind {
    #[inline]
    fn read_from<R: Reader<'a, C>>(reader: &mut R) -> Result<Self, C::Error> {
        let value = u32::read_from(reader)?;
        Ok(value.into())
    }

    #[inline]
    fn minimum_bytes_needed() -> usize {
        <u32 as Readable<'a, C>>::minimum_bytes_needed()
    }
}

#[cfg(feature = "speedy")]
impl<C: Context> Writable<C> for EventKind {
    #[inline]
    fn write_to<T: ?Sized + Writer<C>>(&self, writer: &mut T) -> Result<(), C::Error> {
        writer.write_u32(u32::from(*self))
    }

    #[inline]
    fn bytes_needed(&self) -> Result<usize, C::Error> {
        Ok(std::mem::size_of::<u32>())
    }
}

/// Either an EventKind or a range (a vector of length 2 with start and end)
#[derive(Clone, Debug, Deserialize, Eq, PartialEq, Serialize)]
#[cfg_attr(feature = "speedy", derive(Readable, Writable))]
#[serde(untagged)]
pub enum EventKindOrRange {
    /// A single EventKind
    EventKind(EventKind),

    /// A range of EventKinds
    // NOTE: the internal Vec should have exactly 2 fields.  To force this with a tuple
    //       struct makes ser/de a bitch, so we don't.
    Range(Vec<EventKind>),
}

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

    test_serde! {EventKind, test_event_kind_serde}

    #[test]
    fn test_replaceable_ephemeral() {
        assert!(Metadata.is_replaceable());
        assert!(!TextNote.is_replaceable());
        assert!(!Zap.is_replaceable());
        assert!(LongFormContent.is_replaceable());

        assert!(!TextNote.is_ephemeral());
        assert!(Auth.is_ephemeral());

        assert!(!TextNote.is_parameterized_replaceable());
        assert!(LongFormContent.is_parameterized_replaceable());
    }

    #[cfg(feature = "speedy")]
    #[test]
    fn test_speedy_event_kind() {
        let ek = EventKind::mock();
        let bytes = ek.write_to_vec().unwrap();
        let ek2 = EventKind::read_from_buffer(&bytes).unwrap();
        assert_eq!(ek, ek2);
    }
}