class NetNaviAPI {
    constructor(baseUrl = window.location.origin) {
        if(window.netNaviAPI) return window.netNaviAPI;
        this.baseUrl = baseUrl.replace(/\/$/, '');

        // State properties
        this.petInfo = null;
        this.spriteSheet = null;
        this.isConnected = false;
        this.lastSync = null;
        this.currentWorld = null;
        this.currentWorldHost = null;
        this.currentPlayers = new Map();

        // Socket
        this.worldSocket = null;
        this.llmSocket = io(`${this.baseUrl}/llm`);
        this._setupLLMListeners();
        this.listeners = new Map();
    }

    _setupLLMListeners() {
        this.llmSocket.on('stream', (chunk) => {
            this.emit('llm:stream', chunk);
            if (this.currentStreamCallback) this.currentStreamCallback(chunk);
        });

        this.llmSocket.on('response', (data) => {
            this.emit('llm:response', data);
            if (this.currentResolve) this.currentResolve(data);
            this.currentStreamCallback = null;
            this.currentResolve = null;
            this.currentReject = null;
        });

        this.llmSocket.on('error', (error) => {
            console.error('❌ LLM socket error:', error);
            this.emit('llm:error', error);
            if (this.currentReject) this.currentReject(error);
            this.currentStreamCallback = null;
            this.currentResolve = null;
            this.currentReject = null;
        });
    }

    // ============================================
    // EVENT SYSTEM
    // ============================================

    on(event, callback) {
        if (!this.listeners.has(event)) {
            this.listeners.set(event, []);
        }
        this.listeners.get(event).push(callback);
        return () => this.off(event, callback);
    }

    off(event, callback) {
        const callbacks = this.listeners.get(event);
        if (callbacks) {
            const index = callbacks.indexOf(callback);
            if (index > -1) callbacks.splice(index, 1);
        }
    }

    emit(event, data) {
        const callbacks = this.listeners.get(event) || [];
        callbacks.forEach(cb => cb(data));
    }

    // ============================================
    // REST API
    // ============================================

    async getPetInfo(petId, forceRefresh = false) {
        if (this.petInfo && !forceRefresh) {
            return this.petInfo;
        }

        const response = await fetch(`${this.baseUrl}/api/info`);
        if (!response.ok) throw new Error('Failed to fetch PET info fr fr');

        this.petInfo = await response.json();
        this.lastSync = Date.now();
        this.emit('petInfo:updated', this.petInfo);

        return this.petInfo;
    }

    async getSpriteSheet(petId, forceRefresh = false) {
        if (this.spriteSheet && !forceRefresh) {
            return this.spriteSheet;
        }

        const response = await fetch(`${this.baseUrl}/api/sprite`);
        if (!response.ok) throw new Error('Sprite sheet is cooked 💀');

        this.spriteSheet = await response.json();
        this.emit('sprite:updated', this.spriteSheet);

        return this.spriteSheet;
    }

    async sendUserMessage(userId, message) {
        const response = await fetch(`${this.baseUrl}/api/message`, {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({ message })
        });
        if (!response.ok) throw new Error('Message failed to send bestie');

        const result = await response.json();
        this.emit('message:sent', { userId, message, result });
        return result;
    }

    async linkPet(petId, targetApiUrl) {
        const response = await fetch(`${this.baseUrl}/api/link`, {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({ targetApiUrl })
        });
        if (!response.ok) throw new Error('Link connection is bussin (negatively)');

        const result = await response.json();
        this.emit('pet:linked', { petId, targetApiUrl, result });
        return result;
    }

    // ============================================
    // WORLD SOCKET
    // ============================================

    joinWorld(worldId, callbacks = {}) {
        // Parse the worldId to check if it includes a host
        let targetHost = this.baseUrl;
        let actualWorldId = worldId;

        // Check if worldId is a URL (like "http://other-server.com/worldName")
        if(worldId?.startsWith('http://') || worldId?.startsWith('https://')) {
            const url = new URL(worldId);
            targetHost = url.origin;
            actualWorldId = url.pathname.replace(/^\//, '') || 'default';
        }

        // Leave current world first if we're switching 🚪
        if (this.worldSocket && this.currentWorld) {
            this.worldSocket.emit('player-leave'); // Let server know we're bouncing
            if (this.currentWorldHost !== targetHost) {
                this.worldSocket.disconnect();
                this.worldSocket = null;
            }
        }

        // Initialize world socket for the target host 🔌
        if (!this.worldSocket) {
            this.worldSocket = io(targetHost);
            this.currentWorldHost = targetHost;
            this.isConnected = true;
            this.emit('connection:changed', true);
        }

        this.currentWorld = actualWorldId;

        // Auto-build playerInfo from state 💪
        const playerInfo = {
            name: this.petInfo?.name || 'Guest',
            apiUrl: this.baseUrl
        };

        // Setup socket listeners with provided callbacks 📡
        this.worldSocket.on('world-data', (data) => {
            this.emit('world:loaded', data);
            if (callbacks.onWorldLoaded) callbacks.onWorldLoaded(data);
        });

        this.worldSocket.on('current-players', (players) => {
            this.currentPlayers.clear();
            players.forEach(p => this.currentPlayers.set(p.socketId, p));
            this.emit('world:currentPlayers', players);
            if (callbacks.onCurrentPlayers) callbacks.onCurrentPlayers(players);
        });

        this.worldSocket.on('player-joined', (player) => {
            this.currentPlayers.set(player.socketId, player);
            this.emit('world:playerJoined', player);
            if (callbacks.onPlayerJoined) callbacks.onPlayerJoined(player);
        });

        this.worldSocket.on('player-moved', (data) => {
            const player = this.currentPlayers.get(data.socketId);
            if (player) {
                player.x = data.x;
                player.y = data.y;
            }
            this.emit('world:playerMoved', data);
            if (callbacks.onPlayerMoved) callbacks.onPlayerMoved(data);
        });

        this.worldSocket.on('player-left', (data) => {
            this.currentPlayers.delete(data.socketId);
            this.emit('world:playerLeft', data);
            if (callbacks.onPlayerLeft) callbacks.onPlayerLeft(data);
        });

        this.worldSocket.on('error', (error) => {
            console.error('❌ World socket error:', error);
            this.emit('world:error', error);
            if (callbacks.onError) callbacks.onError(error);
        });

        // Join the world 🌍
        this.worldSocket.emit('join-world', { worldId: actualWorldId, playerInfo });

        // Return actions dictionary for sending updates 📤
        return {
            move: (x, y) => {
                this.worldSocket.emit('player-move', { x, y });
            },
            leave: () => {
                this.worldSocket.disconnect();
                this.worldSocket = null;
                this.currentWorld = null;
                this.currentWorldHost = null;
                this.currentPlayers.clear();
                this.isConnected = false;
                this.emit('connection:changed', false);
            },
            reconnect: () => {
                if (!this.worldSocket || !this.worldSocket.connected) {
                    this.worldSocket = io(this.currentWorldHost || targetHost);
                    this.worldSocket.emit('join-world', { worldId: actualWorldId, playerInfo });
                    this.isConnected = true;
                    this.emit('connection:changed', true);
                }
            }
        };
    }

    // ============================================
    // LLM SOCKET
    // ============================================

    sendPetMessage(message, onStreamCallback) {
        this.currentStreamCallback = onStreamCallback;
        const promise = new Promise((resolve, reject) => {
            this.currentResolve = resolve;
            this.currentReject = reject;
            this.llmSocket.emit('message', {message, apiUrl: this.baseUrl});
        });

        promise.abort = () => {
            this.llmSocket.emit('abort');
            if(this.currentReject) this.currentReject(new Error('Aborted by user'));
            this.currentStreamCallback = null;
            this.currentResolve = null;
            this.currentReject = null;
        };

        return promise;
    }

    clearLLMHistory() {
        if(this.llmSocket) {
            this.llmSocket.emit('clear');
            this.emit('llm:cleared');
        }
    }

    disconnectLLM() {
        if(this.llmSocket) {
            this.llmSocket.disconnect();
            this.llmSocket = null;
        }
    }

    // ============================================
    // UTILITY
    // ============================================

    getState() {
        return {
            petInfo: this.petInfo,
            spriteSheet: this.spriteSheet,
            isConnected: this.isConnected,
            lastSync: this.lastSync,
            currentWorld: this.currentWorld,
            currentPlayers: Array.from(this.currentPlayers.values())
        };
    }

    disconnect() {
        if (this.worldSocket) {
            this.worldSocket.disconnect();
            this.worldSocket = null;
        }
        if (this.llmSocket) {
            this.llmSocket.disconnect();
            this.llmSocket = null;
        }
        this.isConnected = false;
        this.emit('connection:changed', false);
    }
}