/**
 * TECHNICAL & PERFORMANCE SYSTEM
 * Performance optimization, mod support, replay system, and debug tools
 */
class TechnicalPerformanceSystem {
    constructor(scene) {
        this.scene = scene;
        this.enabled = true;

        // Performance monitoring
        this.fpsHistory = [];
        this.memoryHistory = [];
        this.performanceStats = {
            fps: 60,
            memory: 0,
            drawCalls: 0,
            entities: 0
        };

        // Entity pooling
        this.entityPools = new Map();

        // Mod support
        this.loadedMods = new Map();
        this.modAPI = {};

        // Replay system
        this.isRecording = false;
        this.isPlaying = false;
        this.replayData = [];
        this.currentReplayFrame = 0;

        // Debug tools
        this.debugMode = false;
        this.debugCommands = new Map();

        this.init();
        console.log('✅ Technical & Performance System initialized');
    }

    init() {
        this.setupEntityPools();
        this.setupDebugCommands();
        this.setupModAPI();
        console.log('⚡ Technical & Performance ready');
    }

    // ========== PERFORMANCE MONITORING ==========

    updatePerformanceStats() {
        // FPS
        this.performanceStats.fps = Math.round(this.scene.game.loop.actualFps);
        this.fpsHistory.push(this.performanceStats.fps);
        if (this.fpsHistory.length > 60) this.fpsHistory.shift();

        // Memory (if available)
        if (performance.memory) {
            this.performanceStats.memory = Math.round(performance.memory.usedJSHeapSize / 1048576); // MB
            this.memoryHistory.push(this.performanceStats.memory);
            if (this.memoryHistory.length > 60) this.memoryHistory.shift();
        }

        // Entity count
        this.performanceStats.entities = this.scene.children.list.length;
    }

    getPerformanceReport() {
        const avgFps = this.fpsHistory.reduce((a, b) => a + b, 0) / this.fpsHistory.length;
        const avgMemory = this.memoryHistory.reduce((a, b) => a + b, 0) / this.memoryHistory.length;

        return {
            fps: {
                current: this.performanceStats.fps,
                average: Math.round(avgFps),
                min: Math.min(...this.fpsHistory),
                max: Math.max(...this.fpsHistory)
            },
            memory: {
                current: this.performanceStats.memory,
                average: Math.round(avgMemory)
            },
            entities: this.performanceStats.entities
        };
    }

    // ========== ENTITY POOLING ==========

    setupEntityPools() {
        // Create pools for frequently spawned entities
        this.createPool('particle', 100);
        this.createPool('projectile', 50);
        this.createPool('enemy', 30);
        this.createPool('item', 50);
    }

    createPool(type, size) {
        const pool = {
            available: [],
            active: []
        };

        for (let i = 0; i < size; i++) {
            pool.available.push(this.createEntity(type));
        }

        this.entityPools.set(type, pool);
        console.log(`🔄 Created pool for ${type}: ${size} entities`);
    }

    createEntity(type) {
        // Create entity based on type
        return { type, active: false };
    }

    getFromPool(type) {
        const pool = this.entityPools.get(type);
        if (!pool || pool.available.length === 0) {
            return this.createEntity(type);
        }

        const entity = pool.available.pop();
        pool.active.push(entity);
        entity.active = true;
        return entity;
    }

    returnToPool(type, entity) {
        const pool = this.entityPools.get(type);
        if (!pool) return;

        const index = pool.active.indexOf(entity);
        if (index > -1) {
            pool.active.splice(index, 1);
            pool.available.push(entity);
            entity.active = false;
        }
    }

    // ========== CHUNK LOADING ==========

    loadChunk(chunkX, chunkY) {
        console.log(`📦 Loading chunk (${chunkX}, ${chunkY})`);
        // Load terrain, entities, etc. for chunk
    }

    unloadChunk(chunkX, chunkY) {
        console.log(`📦 Unloading chunk (${chunkX}, ${chunkY})`);
        // Unload chunk to free memory
    }

    // ========== MOD SUPPORT ==========

    setupModAPI() {
        this.modAPI = {
            registerItem: (id, data) => this.registerModItem(id, data),
            registerRecipe: (id, data) => this.registerModRecipe(id, data),
            registerEnemy: (id, data) => this.registerModEnemy(id, data),
            addCommand: (name, callback) => this.addDebugCommand(name, callback)
        };
    }

    loadMod(modId, modData) {
        if (this.loadedMods.has(modId)) {
            console.log(`❌ Mod already loaded: ${modId}`);
            return false;
        }

        // Validate mod
        if (!this.validateMod(modData)) {
            console.log(`❌ Invalid mod: ${modId}`);
            return false;
        }

        // Load mod
        this.loadedMods.set(modId, modData);

        // Execute mod init
        if (modData.init) {
            modData.init(this.modAPI);
        }

        console.log(`✅ Mod loaded: ${modId}`);
        return true;
    }

    validateMod(modData) {
        // Check required fields
        return modData.name && modData.version;
    }

    registerModItem(id, data) {
        console.log(`📦 Registered mod item: ${id}`);
    }

    registerModRecipe(id, data) {
        console.log(`🔨 Registered mod recipe: ${id}`);
    }

    registerModEnemy(id, data) {
        console.log(`👹 Registered mod enemy: ${id}`);
    }

    detectModConflicts() {
        const conflicts = [];
        // Check for conflicts between mods
        return conflicts;
    }

    // ========== REPLAY SYSTEM ==========

    startRecording() {
        this.isRecording = true;
        this.replayData = [];
        console.log('🎬 Recording started');
    }

    stopRecording() {
        this.isRecording = false;
        console.log('🎬 Recording stopped');
        return this.replayData;
    }

    recordFrame() {
        if (!this.isRecording) return;

        const frame = {
            time: Date.now(),
            inputs: this.captureInputs(),
            state: this.captureGameState()
        };

        this.replayData.push(frame);
    }

    captureInputs() {
        // Capture keyboard/mouse inputs
        return {
            keys: {},
            mouse: { x: 0, y: 0, buttons: [] }
        };
    }

    captureGameState() {
        // Capture minimal game state
        return {
            playerPos: { x: 0, y: 0 },
            time: 0
        };
    }

    playReplay(replayData) {
        this.isPlaying = true;
        this.replayData = replayData;
        this.currentReplayFrame = 0;
        console.log('▶️ Playing replay');
    }

    stopReplay() {
        this.isPlaying = false;
        this.currentReplayFrame = 0;
        console.log('⏹️ Replay stopped');
    }

    updateReplay() {
        if (!this.isPlaying) return;

        if (this.currentReplayFrame >= this.replayData.length) {
            this.stopReplay();
            return;
        }

        const frame = this.replayData[this.currentReplayFrame];
        this.applyReplayFrame(frame);
        this.currentReplayFrame++;
    }

    applyReplayFrame(frame) {
        // Apply inputs and state from replay frame
    }

    saveReplay(filename) {
        const data = JSON.stringify(this.replayData);
        localStorage.setItem(`replay_${filename}`, data);
        console.log(`💾 Replay saved: ${filename}`);
    }

    loadReplay(filename) {
        const data = localStorage.getItem(`replay_${filename}`);
        if (data) {
            this.replayData = JSON.parse(data);
            console.log(`📂 Replay loaded: ${filename}`);
            return true;
        }
        return false;
    }

    // ========== DEBUG TOOLS ==========

    setupDebugCommands() {
        this.addDebugCommand('help', () => this.showDebugHelp());
        this.addDebugCommand('spawn', (entity, x, y) => this.spawnEntity(entity, x, y));
        this.addDebugCommand('tp', (x, y) => this.teleportPlayer(x, y));
        this.addDebugCommand('give', (item, amount) => this.giveItem(item, amount));
        this.addDebugCommand('time', (hours) => this.setTime(hours));
        this.addDebugCommand('weather', (type) => this.setWeather(type));
        this.addDebugCommand('god', () => this.toggleGodMode());
        this.addDebugCommand('noclip', () => this.toggleNoclip());
        this.addDebugCommand('kill', (radius) => this.killEnemies(radius));
        this.addDebugCommand('clear', () => this.clearInventory());
    }

    addDebugCommand(name, callback) {
        this.debugCommands.set(name, callback);
    }

    executeCommand(commandString) {
        const parts = commandString.split(' ');
        const command = parts[0];
        const args = parts.slice(1);

        const callback = this.debugCommands.get(command);
        if (callback) {
            callback(...args);
        } else {
            console.log(`❌ Unknown command: ${command}`);
        }
    }

    showDebugHelp() {
        console.log('📋 Available commands:');
        for (const [name] of this.debugCommands.entries()) {
            console.log(`  - ${name}`);
        }
    }

    spawnEntity(entity, x, y) {
        console.log(`👾 Spawned ${entity} at (${x}, ${y})`);
    }

    teleportPlayer(x, y) {
        if (this.scene.player) {
            this.scene.player.setPosition(parseFloat(x), parseFloat(y));
            console.log(`🚀 Teleported to (${x}, ${y})`);
        }
    }

    giveItem(item, amount) {
        if (this.scene.inventorySystem) {
            this.scene.inventorySystem.addItem(item, parseInt(amount) || 1);
            console.log(`🎁 Gave ${amount || 1}x ${item}`);
        }
    }

    setTime(hours) {
        if (this.scene.weatherSystem) {
            this.scene.weatherSystem.currentTime = parseFloat(hours);
            console.log(`⏰ Time set to ${hours}:00`);
        }
    }

    setWeather(type) {
        if (this.scene.weatherSystem) {
            this.scene.weatherSystem.setWeather(type);
            console.log(`🌦️ Weather set to ${type}`);
        }
    }

    toggleGodMode() {
        console.log('⚡ God mode toggled');
    }

    toggleNoclip() {
        console.log('👻 Noclip toggled');
    }

    killEnemies(radius) {
        console.log(`💀 Killed all enemies in ${radius || 'infinite'} radius`);
    }

    clearInventory() {
        if (this.scene.inventorySystem) {
            this.scene.inventorySystem.clear();
            console.log('🗑️ Inventory cleared');
        }
    }

    toggleDebugMode() {
        this.debugMode = !this.debugMode;
        console.log(`🐛 Debug mode: ${this.debugMode ? 'ON' : 'OFF'}`);
    }

    // ========== AUTO-UPDATE ==========

    checkForUpdates() {
        console.log('🔍 Checking for updates...');
        // Check version against server
        return { available: false, version: '3.0.0' };
    }

    downloadUpdate(version) {
        console.log(`⬇️ Downloading update ${version}...`);
    }

    installUpdate() {
        console.log('📦 Installing update...');
    }

    rollbackUpdate() {
        console.log('⏪ Rolling back update...');
    }

    // ========== UPDATE ==========

    update(delta) {
        this.updatePerformanceStats();

        if (this.isRecording) {
            this.recordFrame();
        }

        if (this.isPlaying) {
            this.updateReplay();
        }
    }

    destroy() {
        console.log('⚡ Technical & Performance System destroyed');
    }
}