flatland-client-lib 0.2.22

//! Client-side multiplayer chat + trade UI state.

use std::collections::VecDeque;

use flatland_protocol::{
    ChatChannel, ChatClarity, ChatMessage, EntityId, ItemStack, TradePanel,
};

/// Soft UI tones (synthesized; .wav hooks come later).
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum AudioCue {
    TradeOffer,
    Whisper,
    NearbySpeech,
    TradeOpened,
    TradeDeclined,
}

/// Comic "…" bubble above a speaking player (Nearby / Direct only).
#[derive(Debug, Clone, PartialEq)]
pub struct SpeakingBubble {
    pub entity_id: EntityId,
    pub until_ms: u64,
    pub rgb: (u8, u8, u8),
}

pub const SPEECH_BUBBLE_MS: u64 = 2800;

/// Local player's chat color (mint) — distinct from hashed peer colors.
pub fn self_chat_rgb() -> (u8, u8, u8) {
    (110, 220, 195)
}

/// Stable pastel from entity id (same color in CHAT log and world bubble).
pub fn speaker_chat_rgb(entity_id: EntityId) -> (u8, u8, u8) {
    let h = (entity_id.wrapping_mul(2654435761) % 360) as f32;
    hsl_to_rgb(h, 0.58, 0.62)
}

fn hsl_to_rgb(h: f32, s: f32, l: f32) -> (u8, u8, u8) {
    let c = (1.0 - (2.0 * l - 1.0).abs()) * s;
    let hp = h / 60.0;
    let x = c * (1.0 - ((hp % 2.0) - 1.0).abs());
    let (r1, g1, b1) = match hp as i32 {
        0 => (c, x, 0.0),
        1 => (x, c, 0.0),
        2 => (0.0, c, x),
        3 => (0.0, x, c),
        4 => (x, 0.0, c),
        _ => (c, 0.0, x),
    };
    let m = l - c / 2.0;
    (
        ((r1 + m) * 255.0).round().clamp(0.0, 255.0) as u8,
        ((g1 + m) * 255.0).round().clamp(0.0, 255.0) as u8,
        ((b1 + m) * 255.0).round().clamp(0.0, 255.0) as u8,
    )
}

/// One line in the always-visible chat log / active thread.
#[derive(Debug, Clone, PartialEq)]
pub struct ChatLogEntry {
    pub channel: ChatChannel,
    pub from_entity: EntityId,
    pub from_name: String,
    pub to_entity: Option<EntityId>,
    pub text: String,
    pub tick: u64,
    pub clarity: ChatClarity,
    /// System / trade-request lines (not player speech).
    pub system: bool,
    /// Stable speaker color for this line (matches world bubble).
    pub rgb: (u8, u8, u8),
}

impl ChatLogEntry {
    pub fn from_message(msg: ChatMessage, self_id: EntityId) -> Self {
        let rgb = if msg.from_entity == self_id {
            self_chat_rgb()
        } else {
            speaker_chat_rgb(msg.from_entity)
        };
        Self {
            channel: msg.channel,
            from_entity: msg.from_entity,
            from_name: msg.from_name,
            to_entity: msg.to_entity,
            text: msg.text,
            tick: msg.tick,
            clarity: msg.clarity,
            system: false,
            rgb,
        }
    }

    pub fn system_line(text: impl Into<String>) -> Self {
        Self {
            channel: ChatChannel::Nearby,
            from_entity: 0,
            from_name: "system".into(),
            to_entity: None,
            text: text.into(),
            tick: 0,
            clarity: ChatClarity::Clear,
            system: true,
            rgb: (140, 145, 155),
        }
    }
}

/// Where chat input will send.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum ChatThreadKind {
    /// Loud nearby speech (default).
    Nearby,
    /// Private directed whisper (range-gated on send).
    Whisper { peer: EntityId },
    /// Long-range paired whisper stone.
    Stone { peer: EntityId },
}

impl ChatThreadKind {
    pub fn channel(self) -> ChatChannel {
        match self {
            Self::Nearby => ChatChannel::Nearby,
            Self::Whisper { .. } => ChatChannel::Whisper,
            Self::Stone { .. } => ChatChannel::WhisperStone,
        }
    }

    pub fn to_entity(self) -> Option<EntityId> {
        match self {
            Self::Nearby => None,
            Self::Whisper { peer } | Self::Stone { peer } => Some(peer),
        }
    }

    pub fn mode_label(self, peer_name: &str) -> String {
        match self {
            Self::Nearby => "Nearby".into(),
            Self::Whisper { .. } => format!("Whisper → {peer_name}"),
            Self::Stone { .. } => format!("Stone → {peer_name}"),
        }
    }
}

impl Default for ChatThreadKind {
    fn default() -> Self {
        Self::Nearby
    }
}

/// Inbound trade request waiting for Y/N in the chat column.
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct PendingTradeRequest {
    pub from_entity: EntityId,
    pub from_name: String,
}

#[derive(Debug, Clone)]
pub struct SocialChatState {
    pub log: Vec<ChatLogEntry>,
    /// Keyboard focus on the chat input (sidebar) — not a popup.
    pub input_focused: bool,
    pub buffer: String,
    pub thread: ChatThreadKind,
    pub peer_label: String,
    pub log_hidden: bool,
    /// Peer asked to trade — show inline accept in CHAT.
    pub pending_trade: Option<PendingTradeRequest>,
    /// Picking a whisper-stone contact inside the chat column (`g`).
    pub picking_stone: bool,
    pub stone_pick_index: usize,
    /// Active "…" bubbles above speakers.
    pub speaking_bubbles: Vec<SpeakingBubble>,
    /// Soft tones for the gfx client to drain/play.
    pub audio_cues: VecDeque<AudioCue>,
}

impl Default for SocialChatState {
    fn default() -> Self {
        Self {
            log: Vec::new(),
            input_focused: false,
            buffer: String::new(),
            thread: ChatThreadKind::Nearby,
            peer_label: String::new(),
            log_hidden: false,
            pending_trade: None,
            picking_stone: false,
            stone_pick_index: 0,
            speaking_bubbles: Vec::new(),
            audio_cues: VecDeque::new(),
        }
    }
}

impl SocialChatState {
    pub const MAX_LOG: usize = 200;
    pub const MAX_BUF: usize = 200;

    pub fn push(&mut self, entry: ChatLogEntry) {
        self.log.push(entry);
        if self.log.len() > Self::MAX_LOG {
            let drop = self.log.len() - Self::MAX_LOG;
            self.log.drain(0..drop);
        }
    }

    pub fn push_system(&mut self, text: impl Into<String>) {
        self.push(ChatLogEntry::system_line(text));
    }

    pub fn push_cue(&mut self, cue: AudioCue) {
        self.audio_cues.push_back(cue);
        while self.audio_cues.len() > 8 {
            self.audio_cues.pop_front();
        }
    }

    pub fn drain_audio_cues(&mut self) -> Vec<AudioCue> {
        self.audio_cues.drain(..).collect()
    }

    /// Record a speech bubble + optional tone for an inbound chat line.
    pub fn note_speech(
        &mut self,
        msg: &ChatMessage,
        self_id: EntityId,
        now_ms: u64,
    ) {
        let rgb = if msg.from_entity == self_id {
            self_chat_rgb()
        } else {
            speaker_chat_rgb(msg.from_entity)
        };
        match msg.channel {
            ChatChannel::Nearby | ChatChannel::Direct => {
                self.speaking_bubbles
                    .retain(|b| b.entity_id != msg.from_entity && b.until_ms > now_ms);
                self.speaking_bubbles.push(SpeakingBubble {
                    entity_id: msg.from_entity,
                    until_ms: now_ms.saturating_add(SPEECH_BUBBLE_MS),
                    rgb,
                });
                if msg.from_entity != self_id {
                    self.push_cue(AudioCue::NearbySpeech);
                }
            }
            ChatChannel::Whisper | ChatChannel::WhisperStone => {
                if msg.from_entity != self_id {
                    self.push_cue(AudioCue::Whisper);
                }
            }
        }
    }

    pub fn prune_bubbles(&mut self, now_ms: u64) {
        self.speaking_bubbles.retain(|b| b.until_ms > now_ms);
    }

    /// Focus chat for nearby speech (`t`).
    pub fn focus_nearby(&mut self) {
        self.picking_stone = false;
        self.thread = ChatThreadKind::Nearby;
        self.peer_label.clear();
        self.input_focused = true;
    }

    /// Focus chat whispering a nearby player (`f` → Whisper).
    pub fn focus_whisper(&mut self, peer: EntityId, label: &str) {
        self.picking_stone = false;
        self.thread = ChatThreadKind::Whisper { peer };
        self.peer_label = label.to_string();
        self.input_focused = true;
        self.push_system(format!("Whispering {label} — type and Enter · Esc cancels"));
    }

    pub fn focus_stone(&mut self, peer: EntityId, label: &str) {
        self.picking_stone = false;
        self.thread = ChatThreadKind::Stone { peer };
        self.peer_label = label.to_string();
        self.input_focused = true;
        self.push_system(format!("Stone link to {label} — type and Enter"));
    }

    pub fn unfocus(&mut self) {
        self.input_focused = false;
        self.picking_stone = false;
        // Keep whisper/stone thread until they switch; Esc from whisper returns to nearby.
        if matches!(self.thread, ChatThreadKind::Whisper { .. }) {
            self.thread = ChatThreadKind::Nearby;
            self.peer_label.clear();
        }
        self.buffer.clear();
    }

    /// Drop directed whisper when the peer is out of interact range (or gone).
    /// Returns true if whisper mode was cancelled.
    pub fn cancel_whisper_out_of_range(&mut self) -> bool {
        let ChatThreadKind::Whisper { .. } = self.thread else {
            return false;
        };
        let label = if self.peer_label.is_empty() {
            "peer".to_string()
        } else {
            self.peer_label.clone()
        };
        self.thread = ChatThreadKind::Nearby;
        self.peer_label.clear();
        self.input_focused = false;
        self.picking_stone = false;
        self.buffer.clear();
        self.push_system(format!("Whisper with {label} ended — out of range"));
        true
    }

    pub fn prompt_prefix(&self) -> &'static str {
        match self.thread {
            ChatThreadKind::Nearby => "say",
            ChatThreadKind::Whisper { .. } => "whisper",
            ChatThreadKind::Stone { .. } => "stone",
        }
    }

    /// Legacy alias used by older call sites.
    pub fn composer_open(&self) -> bool {
        self.input_focused || self.picking_stone
    }

    pub fn open_nearby(&mut self) {
        self.focus_nearby();
    }

    pub fn open_direct(&mut self, peer: EntityId, label: &str, whisper: bool) {
        if whisper {
            self.focus_whisper(peer, label);
        } else {
            // Speak aloud = nearby (no directed speak UI).
            self.focus_nearby();
            self.push_system(format!("Nearby speech — {label} can hear if close"));
        }
    }

    pub fn open_stone(&mut self, peer: EntityId, label: &str) {
        self.focus_stone(peer, label);
    }

    pub fn close_composer(&mut self) {
        self.unfocus();
    }

    pub fn toggle_mode_speak_whisper(&mut self) {
        // Tab no longer toggles speak↔whisper; nearby is always loud.
        // If whispering, Tab returns to nearby.
        if matches!(self.thread, ChatThreadKind::Whisper { .. } | ChatThreadKind::Stone { .. }) {
            self.thread = ChatThreadKind::Nearby;
            self.peer_label.clear();
            self.push_system("Switched to Nearby speech");
        }
    }
}

#[derive(Debug, Clone, Default)]
pub struct PlayerVerbState {
    pub open: bool,
    pub target_entity: Option<EntityId>,
    pub target_label: String,
    pub index: usize,
}

impl PlayerVerbState {
    /// Speak is ambient (chat section); `f` is only private whisper + trade.
    pub fn options() -> &'static [&'static str] {
        &["Whisper", "Trade"]
    }

    pub fn open_for(&mut self, entity: EntityId, label: &str) {
        self.open = true;
        self.target_entity = Some(entity);
        self.target_label = label.to_string();
        self.index = 0;
    }

    pub fn close(&mut self) {
        self.open = false;
        self.target_entity = None;
        self.target_label.clear();
        self.index = 0;
    }
}

#[derive(Debug, Clone)]
pub struct TradeQtyEntry {
    pub item_instance_id: uuid::Uuid,
    pub label: String,
    pub max_qty: u32,
    /// Current offer quantity (1..=max_qty).
    pub quantity: u32,
    /// Digits typed this session (empty → showing quantity from [ ] / a).
    pub typed: String,
}

#[derive(Debug, Clone, Default)]
pub struct TradeUiState {
    pub panel: Option<TradePanel>,
    pub select_index: usize,
    pub picking_inventory: bool,
    pub inventory_index: usize,
    /// Presenting a stack — choose how many (like storage).
    pub qty_entry: Option<TradeQtyEntry>,
}

impl TradeUiState {
    pub fn open(&mut self, panel: TradePanel) {
        self.panel = Some(panel);
        self.select_index = 0;
        self.picking_inventory = false;
        self.qty_entry = None;
    }

    pub fn close(&mut self) {
        self.panel = None;
        self.picking_inventory = false;
        self.qty_entry = None;
    }

    pub fn apply(&mut self, panel: TradePanel) {
        self.panel = Some(panel);
    }

    pub fn begin_qty_entry(
        &mut self,
        item_instance_id: uuid::Uuid,
        label: String,
        max_qty: u32,
    ) {
        let max_qty = max_qty.max(1);
        self.qty_entry = Some(TradeQtyEntry {
            item_instance_id,
            label,
            max_qty,
            quantity: max_qty,
            typed: String::new(),
        });
        self.picking_inventory = false;
    }

    pub fn adjust_qty(&mut self, delta: i32) {
        let Some(entry) = self.qty_entry.as_mut() else {
            return;
        };
        entry.typed.clear();
        let next = (entry.quantity as i32 + delta).clamp(1, entry.max_qty as i32);
        entry.quantity = next as u32;
    }

    pub fn set_qty_all(&mut self) {
        if let Some(entry) = self.qty_entry.as_mut() {
            entry.typed.clear();
            entry.quantity = entry.max_qty;
        }
    }

    pub fn append_qty_digit(&mut self, c: char) {
        let Some(entry) = self.qty_entry.as_mut() else {
            return;
        };
        if !c.is_ascii_digit() || entry.typed.len() >= 8 {
            return;
        }
        entry.typed.push(c);
        let parsed = entry.typed.parse::<u32>().unwrap_or(1);
        entry.quantity = parsed.clamp(1, entry.max_qty);
    }

    pub fn qty_backspace(&mut self) {
        let Some(entry) = self.qty_entry.as_mut() else {
            return;
        };
        if !entry.typed.is_empty() {
            entry.typed.pop();
            entry.quantity = if entry.typed.is_empty() {
                1
            } else {
                entry
                    .typed
                    .parse::<u32>()
                    .unwrap_or(1)
                    .clamp(1, entry.max_qty)
            };
            return;
        }
        entry.quantity = (entry.quantity / 10).max(1);
    }

    /// Intent quantity: `None` means entire stack.
    pub fn present_quantity(&self) -> Option<u32> {
        let entry = self.qty_entry.as_ref()?;
        if entry.quantity >= entry.max_qty {
            None
        } else {
            Some(entry.quantity)
        }
    }
}

#[derive(Debug, Clone, Default)]
pub struct WhisperPouchUi {
    pub open: bool,
    pub index: usize,
}

#[derive(Debug, Clone)]
pub struct WhisperContact {
    pub instance_id: uuid::Uuid,
    pub peer_label: String,
    pub peer_character_id: Option<uuid::Uuid>,
    pub pair_id: Option<String>,
    pub blank: bool,
}

pub fn contacts_from_stacks(stacks: &[ItemStack]) -> Vec<WhisperContact> {
    stacks
        .iter()
        .filter(|s| s.template_id == "whisper_stone")
        .map(|s| {
            let pair_id = s.props.get("whisper_pair_id").cloned();
            let peer_label = s.props.get("peer_label").cloned().unwrap_or_else(|| {
                if pair_id.is_some() {
                    "Unknown".into()
                } else {
                    "Blank stone".into()
                }
            });
            let peer_character_id = s
                .props
                .get("peer_character_id")
                .and_then(|v| uuid::Uuid::parse_str(v).ok());
            WhisperContact {
                instance_id: s.item_instance_id.unwrap_or_default(),
                peer_label,
                peer_character_id,
                pair_id,
                blank: !s.props.contains_key("whisper_pair_id"),
            }
        })
        .collect()
}

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

    #[test]
    fn cancel_whisper_out_of_range_clears_thread() {
        let mut chat = SocialChatState::default();
        chat.focus_whisper(42, "Ada");
        assert!(matches!(
            chat.thread,
            ChatThreadKind::Whisper { peer: 42 }
        ));
        assert!(chat.input_focused);
        assert!(chat.cancel_whisper_out_of_range());
        assert_eq!(chat.thread, ChatThreadKind::Nearby);
        assert!(!chat.input_focused);
        assert!(chat.buffer.is_empty());
        assert!(chat
            .log
            .last()
            .is_some_and(|e| e.system && e.text.contains("out of range")));
    }

    #[test]
    fn cancel_whisper_noop_when_nearby_or_stone() {
        let mut chat = SocialChatState::default();
        chat.focus_nearby();
        assert!(!chat.cancel_whisper_out_of_range());
        chat.focus_stone(7, "Bob");
        assert!(!chat.cancel_whisper_out_of_range());
        assert!(matches!(chat.thread, ChatThreadKind::Stone { peer: 7 }));
    }
}